text: /*!
   * Vue.js v1.0.26-csp
   * (c) 2016 Evan You
   * Released under the MIT License.
   */
  (function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
    typeof define === 'function' && define.amd ? define(factory) :
    (global.Vue = factory());
  }(this, function () { 'use strict';
  
    function set(obj, key, val) {
      if (hasOwn(obj, key)) {
        obj[key] = val;
        return;
      }
      if (obj._isVue) {
        set(obj._data, key, val);
        return;
      }
      var ob = obj.__ob__;
      if (!ob) {
        obj[key] = val;
        return;
      }
      ob.convert(key, val);
      ob.dep.notify();
      if (ob.vms) {
        var i = ob.vms.length;
        while (i--) {
          var vm = ob.vms[i];
          vm._proxy(key);
          vm._digest();
        }
      }
      return val;
    }
  
    /**
     * Delete a property and trigger change if necessary.
     *
     * @param {Object} obj
     * @param {String} key
     */
  
    function del(obj, key) {
      if (!hasOwn(obj, key)) {
        return;
      }
      delete obj[key];
      var ob = obj.__ob__;
      if (!ob) {
        if (obj._isVue) {
          delete obj._data[key];
          obj._digest();
        }
        return;
      }
      ob.dep.notify();
      if (ob.vms) {
        var i = ob.vms.length;
        while (i--) {
          var vm = ob.vms[i];
          vm._unproxy(key);
          vm._digest();
        }
      }
    }
  
    var hasOwnProperty = Object.prototype.hasOwnProperty;
    /**
     * Check whether the object has the property.
     *
     * @param {Object} obj
     * @param {String} key
     * @return {Boolean}
     */
  
    function hasOwn(obj, key) {
      return hasOwnProperty.call(obj, key);
    }
  
    /**
     * Check if an expression is a literal value.
     *
     * @param {String} exp
     * @return {Boolean}
     */
  
    var literalValueRE = /^\s?(true|false|-?[\d\.]+|'[^']*'|"[^"]*")\s?$/;
  
    function isLiteral(exp) {
      return literalValueRE.test(exp);
    }
  
    /**
     * Check if a string starts with $ or _
     *
     * @param {String} str
     * @return {Boolean}
     */
  
    function isReserved(str) {
      var c = (str + '').charCodeAt(0);
      return c === 0x24 || c === 0x5F;
    }
  
    /**
     * Guard text output, make sure undefined outputs
     * empty string
     *
     * @param {*} value
     * @return {String}
     */
  
    function _toString(value) {
      return value == null ? '' : value.toString();
    }
  
    /**
     * Check and convert possible numeric strings to numbers
     * before setting back to data
     *
     * @param {*} value
     * @return {*|Number}
     */
  
    function toNumber(value) {
      if (typeof value !== 'string') {
        return value;
      } else {
        var parsed = Number(value);
        return isNaN(parsed) ? value : parsed;
      }
    }
  
    /**
     * Convert string boolean literals into real booleans.
     *
     * @param {*} value
     * @return {*|Boolean}
     */
  
    function toBoolean(value) {
      return value === 'true' ? true : value === 'false' ? false : value;
    }
  
    /**
     * Strip quotes from a string
     *
     * @param {String} str
     * @return {String | false}
     */
  
    function stripQuotes(str) {
      var a = str.charCodeAt(0);
      var b = str.charCodeAt(str.length - 1);
      return a === b && (a === 0x22 || a === 0x27) ? str.slice(1, -1) : str;
    }
  
    /**
     * Camelize a hyphen-delmited string.
     *
     * @param {String} str
     * @return {String}
     */
  
    var camelizeRE = /-(\w)/g;
  
    function camelize(str) {
      return str.replace(camelizeRE, toUpper);
    }
  
    function toUpper(_, c) {
      return c ? c.toUpperCase() : '';
    }
  
    /**
     * Hyphenate a camelCase string.
     *
     * @param {String} str
     * @return {String}
     */
  
    var hyphenateRE = /([a-z\d])([A-Z])/g;
  
    function hyphenate(str) {
      return str.replace(hyphenateRE, '$1-$2').toLowerCase();
    }
  
    /**
     * Converts hyphen/underscore/slash delimitered names into
     * camelized classNames.
     *
     * e.g. my-component => MyComponent
     *      some_else    => SomeElse
     *      some/comp    => SomeComp
     *
     * @param {String} str
     * @return {String}
     */
  
    var classifyRE = /(?:^|[-_\/])(\w)/g;
  
    function classify(str) {
      return str.replace(classifyRE, toUpper);
    }
  
    /**
     * Simple bind, faster than native
     *
     * @param {Function} fn
     * @param {Object} ctx
     * @return {Function}
     */
  
    function bind(fn, ctx) {
      return function (a) {
        var l = arguments.length;
        return l ? l > 1 ? fn.apply(ctx, arguments) : fn.call(ctx, a) : fn.call(ctx);
      };
    }
  
    /**
     * Convert an Array-like object to a real Array.
     *
     * @param {Array-like} list
     * @param {Number} [start] - start index
     * @return {Array}
     */
  
    function toArray(list, start) {
      start = start || 0;
      var i = list.length - start;
      var ret = new Array(i);
      while (i--) {
        ret[i] = list[i + start];
      }
      return ret;
    }
  
    /**
     * Mix properties into target object.
     *
     * @param {Object} to
     * @param {Object} from
     */
  
    function extend(to, from) {
      var keys = Object.keys(from);
      var i = keys.length;
      while (i--) {
        to[keys[i]] = from[keys[i]];
      }
      return to;
    }
  
    /**
     * Quick object check - this is primarily used to tell
     * Objects from primitive values when we know the value
     * is a JSON-compliant type.
     *
     * @param {*} obj
     * @return {Boolean}
     */
  
    function isObject(obj) {
      return obj !== null && typeof obj === 'object';
    }
  
    /**
     * Strict object type check. Only returns true
     * for plain JavaScript objects.
     *
     * @param {*} obj
     * @return {Boolean}
     */
  
    var toString = Object.prototype.toString;
    var OBJECT_STRING = '[object Object]';
  
    function isPlainObject(obj) {
      return toString.call(obj) === OBJECT_STRING;
    }
  
    /**
     * Array type check.
     *
     * @param {*} obj
     * @return {Boolean}
     */
  
    var isArray = Array.isArray;
  
    /**
     * Define a property.
     *
     * @param {Object} obj
     * @param {String} key
     * @param {*} val
     * @param {Boolean} [enumerable]
     */
  
    function def(obj, key, val, enumerable) {
      Object.defineProperty(obj, key, {
        value: val,
        enumerable: !!enumerable,
        writable: true,
        configurable: true
      });
    }
  
    /**
     * Debounce a function so it only gets called after the
     * input stops arriving after the given wait period.
     *
     * @param {Function} func
     * @param {Number} wait
     * @return {Function} - the debounced function
     */
  
    function _debounce(func, wait) {
      var timeout, args, context, timestamp, result;
      var later = function later() {
        var last = Date.now() - timestamp;
        if (last < wait && last >= 0) {
          timeout = setTimeout(later, wait - last);
        } else {
          timeout = null;
          result = func.apply(context, args);
          if (!timeout) context = args = null;
        }
      };
      return function () {
        context = this;
        args = arguments;
        timestamp = Date.now();
        if (!timeout) {
          timeout = setTimeout(later, wait);
        }
        return result;
      };
    }
  
    /**
     * Manual indexOf because it's slightly faster than
     * native.
     *
     * @param {Array} arr
     * @param {*} obj
     */
  
    function indexOf(arr, obj) {
      var i = arr.length;
      while (i--) {
        if (arr[i] === obj) return i;
      }
      return -1;
    }
  
    /**
     * Make a cancellable version of an async callback.
     *
     * @param {Function} fn
     * @return {Function}
     */
  
    function cancellable(fn) {
      var cb = function cb() {
        if (!cb.cancelled) {
          return fn.apply(this, arguments);
        }
      };
      cb.cancel = function () {
        cb.cancelled = true;
      };
      return cb;
    }
  
    /**
     * Check if two values are loosely equal - that is,
     * if they are plain objects, do they have the same shape?
     *
     * @param {*} a
     * @param {*} b
     * @return {Boolean}
     */
  
    function looseEqual(a, b) {
      /* eslint-disable eqeqeq */
      return a == b || (isObject(a) && isObject(b) ? JSON.stringify(a) === JSON.stringify(b) : false);
      /* eslint-enable eqeqeq */
    }
  
    var hasProto = ('__proto__' in {});
  
    // Browser environment sniffing
    var inBrowser = typeof window !== 'undefined' && Object.prototype.toString.call(window) !== '[object Object]';
  
    // detect devtools
    var devtools = inBrowser && window.__VUE_DEVTOOLS_GLOBAL_HOOK__;
  
    // UA sniffing for working around browser-specific quirks
    var UA = inBrowser && window.navigator.userAgent.toLowerCase();
    var isIE = UA && UA.indexOf('trident') > 0;
    var isIE9 = UA && UA.indexOf('msie 9.0') > 0;
    var isAndroid = UA && UA.indexOf('android') > 0;
    var isIos = UA && /(iphone|ipad|ipod|ios)/i.test(UA);
    var iosVersionMatch = isIos && UA.match(/os ([\d_]+)/);
    var iosVersion = iosVersionMatch && iosVersionMatch[1].split('_');
  
    // detecting iOS UIWebView by indexedDB
    var hasMutationObserverBug = iosVersion && Number(iosVersion[0]) >= 9 && Number(iosVersion[1]) >= 3 && !window.indexedDB;
  
    var transitionProp = undefined;
    var transitionEndEvent = undefined;
    var animationProp = undefined;
    var animationEndEvent = undefined;
  
    // Transition property/event sniffing
    if (inBrowser && !isIE9) {
      var isWebkitTrans = window.ontransitionend === undefined && window.onwebkittransitionend !== undefined;
      var isWebkitAnim = window.onanimationend === undefined && window.onwebkitanimationend !== undefined;
      transitionProp = isWebkitTrans ? 'WebkitTransition' : 'transition';
      transitionEndEvent = isWebkitTrans ? 'webkitTransitionEnd' : 'transitionend';
      animationProp = isWebkitAnim ? 'WebkitAnimation' : 'animation';
      animationEndEvent = isWebkitAnim ? 'webkitAnimationEnd' : 'animationend';
    }
  
    /**
     * Defer a task to execute it asynchronously. Ideally this
     * should be executed as a microtask, so we leverage
     * MutationObserver if it's available, and fallback to
     * setTimeout(0).
     *
     * @param {Function} cb
     * @param {Object} ctx
     */
  
    var nextTick = (function () {
      var callbacks = [];
      var pending = false;
      var timerFunc;
      function nextTickHandler() {
        pending = false;
        var copies = callbacks.slice(0);
        callbacks = [];
        for (var i = 0; i < copies.length; i++) {
          copies[i]();
        }
      }
  
      /* istanbul ignore if */
      if (typeof MutationObserver !== 'undefined' && !hasMutationObserverBug) {
        var counter = 1;
        var observer = new MutationObserver(nextTickHandler);
        var textNode = document.createTextNode(counter);
        observer.observe(textNode, {
          characterData: true
        });
        timerFunc = function () {
          counter = (counter + 1) % 2;
          textNode.data = counter;
        };
      } else {
        // webpack attempts to inject a shim for setImmediate
        // if it is used as a global, so we have to work around that to
        // avoid bundling unnecessary code.
        var context = inBrowser ? window : typeof global !== 'undefined' ? global : {};
        timerFunc = context.setImmediate || setTimeout;
      }
      return function (cb, ctx) {
        var func = ctx ? function () {
          cb.call(ctx);
        } : cb;
        callbacks.push(func);
        if (pending) return;
        pending = true;
        timerFunc(nextTickHandler, 0);
      };
    })();
  
    var _Set = undefined;
    /* istanbul ignore if */
    if (typeof Set !== 'undefined' && Set.toString().match(/native code/)) {
      // use native Set when available.
      _Set = Set;
    } else {
      // a non-standard Set polyfill that only works with primitive keys.
      _Set = function () {
        this.set = Object.create(null);
      };
      _Set.prototype.has = function (key) {
        return this.set[key] !== undefined;
      };
      _Set.prototype.add = function (key) {
        this.set[key] = 1;
      };
      _Set.prototype.clear = function () {
        this.set = Object.create(null);
      };
    }
  
    function Cache(limit) {
      this.size = 0;
      this.limit = limit;
      this.head = this.tail = undefined;
      this._keymap = Object.create(null);
    }
  
    var p = Cache.prototype;
  
    /**
     * Put <value> into the cache associated with <key>.
     * Returns the entry which was removed to make room for
     * the new entry. Otherwise undefined is returned.
     * (i.e. if there was enough room already).
     *
     * @param {String} key
     * @param {*} value
     * @return {Entry|undefined}
     */
  
    p.put = function (key, value) {
      var removed;
  
      var entry = this.get(key, true);
      if (!entry) {
        if (this.size === this.limit) {
          removed = this.shift();
        }
        entry = {
          key: key
        };
        this._keymap[key] = entry;
        if (this.tail) {
          this.tail.newer = entry;
          entry.older = this.tail;
        } else {
          this.head = entry;
        }
        this.tail = entry;
        this.size++;
      }
      entry.value = value;
  
      return removed;
    };
  
    /**
     * Purge the least recently used (oldest) entry from the
     * cache. Returns the removed entry or undefined if the
     * cache was empty.
     */
  
    p.shift = function () {
      var entry = this.head;
      if (entry) {
        this.head = this.head.newer;
        this.head.older = undefined;
        entry.newer = entry.older = undefined;
        this._keymap[entry.key] = undefined;
        this.size--;
      }
      return entry;
    };
  
    /**
     * Get and register recent use of <key>. Returns the value
     * associated with <key> or undefined if not in cache.
     *
     * @param {String} key
     * @param {Boolean} returnEntry
     * @return {Entry|*}
     */
  
    p.get = function (key, returnEntry) {
      var entry = this._keymap[key];
      if (entry === undefined) return;
      if (entry === this.tail) {
        return returnEntry ? entry : entry.value;
      }
      // HEAD--------------TAIL
      //   <.older   .newer>
      //  <--- add direction --
      //   A  B  C  <D>  E
      if (entry.newer) {
        if (entry === this.head) {
          this.head = entry.newer;
        }
        entry.newer.older = entry.older; // C <-- E.
      }
      if (entry.older) {
        entry.older.newer = entry.newer; // C. --> E
      }
      entry.newer = undefined; // D --x
      entry.older = this.tail; // D. --> E
      if (this.tail) {
        this.tail.newer = entry; // E. <-- D
      }
      this.tail = entry;
      return returnEntry ? entry : entry.value;
    };
  
    var cache$1 = new Cache(1000);
    var filterTokenRE = /[^\s'"]+|'[^']*'|"[^"]*"/g;
    var reservedArgRE = /^in$|^-?\d+/;
  
    /**
     * Parser state
     */
  
    var str;
    var dir;
    var c;
    var prev;
    var i;
    var l;
    var lastFilterIndex;
    var inSingle;
    var inDouble;
    var curly;
    var square;
    var paren;
    /**
     * Push a filter to the current directive object
     */
  
    function pushFilter() {
      var exp = str.slice(lastFilterIndex, i).trim();
      var filter;
      if (exp) {
        filter = {};
        var tokens = exp.match(filterTokenRE);
        filter.name = tokens[0];
        if (tokens.length > 1) {
          filter.args = tokens.slice(1).map(processFilterArg);
        }
      }
      if (filter) {
        (dir.filters = dir.filters || []).push(filter);
      }
      lastFilterIndex = i + 1;
    }
  
    /**
     * Check if an argument is dynamic and strip quotes.
     *
     * @param {String} arg
     * @return {Object}
     */
  
    function processFilterArg(arg) {
      if (reservedArgRE.test(arg)) {
        return {
          value: toNumber(arg),
          dynamic: false
        };
      } else {
        var stripped = stripQuotes(arg);
        var dynamic = stripped === arg;
        return {
          value: dynamic ? arg : stripped,
          dynamic: dynamic
        };
      }
    }
  
    /**
     * Parse a directive value and extract the expression
     * and its filters into a descriptor.
     *
     * Example:
     *
     * "a + 1 | uppercase" will yield:
     * {
     *   expression: 'a + 1',
     *   filters: [
     *     { name: 'uppercase', args: null }
     *   ]
     * }
     *
     * @param {String} s
     * @return {Object}
     */
  
    function parseDirective(s) {
      var hit = cache$1.get(s);
      if (hit) {
        return hit;
      }
  
      // reset parser state
      str = s;
      inSingle = inDouble = false;
      curly = square = paren = 0;
      lastFilterIndex = 0;
      dir = {};
  
      for (i = 0, l = str.length; i < l; i++) {
        prev = c;
        c = str.charCodeAt(i);
        if (inSingle) {
          // check single quote
          if (c === 0x27 && prev !== 0x5C) inSingle = !inSingle;
        } else if (inDouble) {
          // check double quote
          if (c === 0x22 && prev !== 0x5C) inDouble = !inDouble;
        } else if (c === 0x7C && // pipe
        str.charCodeAt(i + 1) !== 0x7C && str.charCodeAt(i - 1) !== 0x7C) {
          if (dir.expression == null) {
            // first filter, end of expression
            lastFilterIndex = i + 1;
            dir.expression = str.slice(0, i).trim();
          } else {
            // already has filter
            pushFilter();
          }
        } else {
          switch (c) {
            case 0x22:
              inDouble = true;break; // "
            case 0x27:
              inSingle = true;break; // '
            case 0x28:
              paren++;break; // (
            case 0x29:
              paren--;break; // )
            case 0x5B:
              square++;break; // [
            case 0x5D:
              square--;break; // ]
            case 0x7B:
              curly++;break; // {
            case 0x7D:
              curly--;break; // }
          }
        }
      }
  
      if (dir.expression == null) {
        dir.expression = str.slice(0, i).trim();
      } else if (lastFilterIndex !== 0) {
        pushFilter();
      }
  
      cache$1.put(s, dir);
      return dir;
    }
  
  var directive = Object.freeze({
      parseDirective: parseDirective
    });
  
    var regexEscapeRE = /[-.*+?^${}()|[\]\/\\]/g;
    var cache = undefined;
    var tagRE = undefined;
    var htmlRE = undefined;
    /**
     * Escape a string so it can be used in a RegExp
     * constructor.
     *
     * @param {String} str
     */
  
    function escapeRegex(str) {
      return str.replace(regexEscapeRE, '\\$&');
    }
  
    function compileRegex() {
      var open = escapeRegex(config.delimiters[0]);
      var close = escapeRegex(config.delimiters[1]);
      var unsafeOpen = escapeRegex(config.unsafeDelimiters[0]);
      var unsafeClose = escapeRegex(config.unsafeDelimiters[1]);
      tagRE = new RegExp(unsafeOpen + '((?:.|\\n)+?)' + unsafeClose + '|' + open + '((?:.|\\n)+?)' + close, 'g');
      htmlRE = new RegExp('^' + unsafeOpen + '((?:.|\\n)+?)' + unsafeClose + '$');
      // reset cache
      cache = new Cache(1000);
    }
  
    /**
     * Parse a template text string into an array of tokens.
     *
     * @param {String} text
     * @return {Array<Object> | null}
     *               - {String} type
     *               - {String} value
     *               - {Boolean} [html]
     *               - {Boolean} [oneTime]
     */
  
    function parseText(text) {
      if (!cache) {
        compileRegex();
      }
      var hit = cache.get(text);
      if (hit) {
        return hit;
      }
      if (!tagRE.test(text)) {
        return null;
      }
      var tokens = [];
      var lastIndex = tagRE.lastIndex = 0;
      var match, index, html, value, first, oneTime;
      /* eslint-disable no-cond-assign */
      while (match = tagRE.exec(text)) {
        /* eslint-enable no-cond-assign */
        index = match.index;
        // push text token
        if (index > lastIndex) {
          tokens.push({
            value: text.slice(lastIndex, index)
          });
        }
        // tag token
        html = htmlRE.test(match[0]);
        value = html ? match[1] : match[2];
        first = value.charCodeAt(0);
        oneTime = first === 42; // *
        value = oneTime ? value.slice(1) : value;
        tokens.push({
          tag: true,
          value: value.trim(),
          html: html,
          oneTime: oneTime
        });
        lastIndex = index + match[0].length;
      }
      if (lastIndex < text.length) {
        tokens.push({
          value: text.slice(lastIndex)
        });
      }
      cache.put(text, tokens);
      return tokens;
    }
  
    /**
     * Format a list of tokens into an expression.
     * e.g. tokens parsed from 'a {{b}} c' can be serialized
     * into one single expression as '"a " + b + " c"'.
     *
     * @param {Array} tokens
     * @param {Vue} [vm]
     * @return {String}
     */
  
    function tokensToExp(tokens, vm) {
      if (tokens.length > 1) {
        return tokens.map(function (token) {
          return formatToken(token, vm);
        }).join('+');
      } else {
        return formatToken(tokens[0], vm, true);
      }
    }
  
    /**
     * Format a single token.
     *
     * @param {Object} token
     * @param {Vue} [vm]
     * @param {Boolean} [single]
     * @return {String}
     */
  
    function formatToken(token, vm, single) {
      return token.tag ? token.oneTime && vm ? '"' + vm.$eval(token.value) + '"' : inlineFilters(token.value, single) : '"' + token.value + '"';
    }
  
    /**
     * For an attribute with multiple interpolation tags,
     * e.g. attr="some-{{thing | filter}}", in order to combine
     * the whole thing into a single watchable expression, we
     * have to inline those filters. This function does exactly
     * that. This is a bit hacky but it avoids heavy changes
     * to directive parser and watcher mechanism.
     *
     * @param {String} exp
     * @param {Boolean} single
     * @return {String}
     */
  
    var filterRE = /[^|]\|[^|]/;
    function inlineFilters(exp, single) {
      if (!filterRE.test(exp)) {
        return single ? exp : '(' + exp + ')';
      } else {
        var dir = parseDirective(exp);
        if (!dir.filters) {
          return '(' + exp + ')';
        } else {
          return 'this._applyFilters(' + dir.expression + // value
          ',null,' + // oldValue (null for read)
          JSON.stringify(dir.filters) + // filter descriptors
          ',false)'; // write?
        }
      }
    }
  
  var text = Object.freeze({
      compileRegex: compileRegex,
      parseText: parseText,
      tokensToExp: tokensToExp
    });
  
    var delimiters = ['{{', '}}'];
    var unsafeDelimiters = ['{{{', '}}}'];
  
    var config = Object.defineProperties({
  
      /**
       * Whether to print debug messages.
       * Also enables stack trace for warnings.
       *
       * @type {Boolean}
       */
  
      debug: false,
  
      /**
       * Whether to suppress warnings.
       *
       * @type {Boolean}
       */
  
      silent: false,
  
      /**
       * Whether to use async rendering.
       */
  
      async: true,
  
      /**
       * Whether to warn against errors caught when evaluating
       * expressions.
       */
  
      warnExpressionErrors: true,
  
      /**
       * Whether to allow devtools inspection.
       * Disabled by default in production builds.
       */
  
      devtools: 'development' !== 'production',
  
      /**
       * Internal flag to indicate the delimiters have been
       * changed.
       *
       * @type {Boolean}
       */
  
      _delimitersChanged: true,
  
      /**
       * List of asset types that a component can own.
       *
       * @type {Array}
       */
  
      _assetTypes: ['component', 'directive', 'elementDirective', 'filter', 'transition', 'partial'],
  
      /**
       * prop binding modes
       */
  
      _propBindingModes: {
        ONE_WAY: 0,
        TWO_WAY: 1,
        ONE_TIME: 2
      },
  
      /**
       * Max circular updates allowed in a batcher flush cycle.
       */
  
      _maxUpdateCount: 100
  
    }, {
      delimiters: { /**
                     * Interpolation delimiters. Changing these would trigger
                     * the text parser to re-compile the regular expressions.
                     *
                     * @type {Array<String>}
                     */
  
        get: function get() {
          return delimiters;
        },
        set: function set(val) {
          delimiters = val;
          compileRegex();
        },
        configurable: true,
        enumerable: true
      },
      unsafeDelimiters: {
        get: function get() {
          return unsafeDelimiters;
        },
        set: function set(val) {
          unsafeDelimiters = val;
          compileRegex();
        },
        configurable: true,
        enumerable: true
      }
    });
  
    var warn = undefined;
    var formatComponentName = undefined;
  
    if ('development' !== 'production') {
      (function () {
        var hasConsole = typeof console !== 'undefined';
  
        warn = function (msg, vm) {
          if (hasConsole && !config.silent) {
            console.error('[Vue warn]: ' + msg + (vm ? formatComponentName(vm) : ''));
          }
        };
  
        formatComponentName = function (vm) {
          var name = vm._isVue ? vm.$options.name : vm.name;
          return name ? ' (found in component: <' + hyphenate(name) + '>)' : '';
        };
      })();
    }
  
    /**
     * Append with transition.
     *
     * @param {Element} el
     * @param {Element} target
     * @param {Vue} vm
     * @param {Function} [cb]
     */
  
    function appendWithTransition(el, target, vm, cb) {
      applyTransition(el, 1, function () {
        target.appendChild(el);
      }, vm, cb);
    }
  
    /**
     * InsertBefore with transition.
     *
     * @param {Element} el
     * @param {Element} target
     * @param {Vue} vm
     * @param {Function} [cb]
     */
  
    function beforeWithTransition(el, target, vm, cb) {
      applyTransition(el, 1, function () {
        before(el, target);
      }, vm, cb);
    }
  
    /**
     * Remove with transition.
     *
     * @param {Element} el
     * @param {Vue} vm
     * @param {Function} [cb]
     */
  
    function removeWithTransition(el, vm, cb) {
      applyTransition(el, -1, function () {
        remove(el);
      }, vm, cb);
    }
  
    /**
     * Apply transitions with an operation callback.
     *
     * @param {Element} el
     * @param {Number} direction
     *                  1: enter
     *                 -1: leave
     * @param {Function} op - the actual DOM operation
     * @param {Vue} vm
     * @param {Function} [cb]
     */
  
    function applyTransition(el, direction, op, vm, cb) {
      var transition = el.__v_trans;
      if (!transition ||
      // skip if there are no js hooks and CSS transition is
      // not supported
      !transition.hooks && !transitionEndEvent ||
      // skip transitions for initial compile
      !vm._isCompiled ||
      // if the vm is being manipulated by a parent directive
      // during the parent's compilation phase, skip the
      // animation.
      vm.$parent && !vm.$parent._isCompiled) {
        op();
        if (cb) cb();
        return;
      }
      var action = direction > 0 ? 'enter' : 'leave';
      transition[action](op, cb);
    }
  
  var transition = Object.freeze({
      appendWithTransition: appendWithTransition,
      beforeWithTransition: beforeWithTransition,
      removeWithTransition: removeWithTransition,
      applyTransition: applyTransition
    });
  
    /**
     * Query an element selector if it's not an element already.
     *
     * @param {String|Element} el
     * @return {Element}
     */
  
    function query(el) {
      if (typeof el === 'string') {
        var selector = el;
        el = document.querySelector(el);
        if (!el) {
          'development' !== 'production' && warn('Cannot find element: ' + selector);
        }
      }
      return el;
    }
  
    /**
     * Check if a node is in the document.
     * Note: document.documentElement.contains should work here
     * but always returns false for comment nodes in phantomjs,
     * making unit tests difficult. This is fixed by doing the
     * contains() check on the node's parentNode instead of
     * the node itself.
     *
     * @param {Node} node
     * @return {Boolean}
     */
  
    function inDoc(node) {
      if (!node) return false;
      var doc = node.ownerDocument.documentElement;
      var parent = node.parentNode;
      return doc === node || doc === parent || !!(parent && parent.nodeType === 1 && doc.contains(parent));
    }
  
    /**
     * Get and remove an attribute from a node.
     *
     * @param {Node} node
     * @param {String} _attr
     */
  
    function getAttr(node, _attr) {
      var val = node.getAttribute(_attr);
      if (val !== null) {
        node.removeAttribute(_attr);
      }
      return val;
    }
  
    /**
     * Get an attribute with colon or v-bind: prefix.
     *
     * @param {Node} node
     * @param {String} name
     * @return {String|null}
     */
  
    function getBindAttr(node, name) {
      var val = getAttr(node, ':' + name);
      if (val === null) {
        val = getAttr(node, 'v-bind:' + name);
      }
      return val;
    }
  
    /**
     * Check the presence of a bind attribute.
     *
     * @param {Node} node
     * @param {String} name
     * @return {Boolean}
     */
  
    function hasBindAttr(node, name) {
      return node.hasAttribute(name) || node.hasAttribute(':' + name) || node.hasAttribute('v-bind:' + name);
    }
  
    /**
     * Insert el before target
     *
     * @param {Element} el
     * @param {Element} target
     */
  
    function before(el, target) {
      target.parentNode.insertBefore(el, target);
    }
  
    /**
     * Insert el after target
     *
     * @param {Element} el
     * @param {Element} target
     */
  
    function after(el, target) {
      if (target.nextSibling) {
        before(el, target.nextSibling);
      } else {
        target.parentNode.appendChild(el);
      }
    }
  
    /**
     * Remove el from DOM
     *
     * @param {Element} el
     */
  
    function remove(el) {
      el.parentNode.removeChild(el);
    }
  
    /**
     * Prepend el to target
     *
     * @param {Element} el
     * @param {Element} target
     */
  
    function prepend(el, target) {
      if (target.firstChild) {
        before(el, target.firstChild);
      } else {
        target.appendChild(el);
      }
    }
  
    /**
     * Replace target with el
     *
     * @param {Element} target
     * @param {Element} el
     */
  
    function replace(target, el) {
      var parent = target.parentNode;
      if (parent) {
        parent.replaceChild(el, target);
      }
    }
  
    /**
     * Add event listener shorthand.
     *
     * @param {Element} el
     * @param {String} event
     * @param {Function} cb
     * @param {Boolean} [useCapture]
     */
  
    function on(el, event, cb, useCapture) {
      el.addEventListener(event, cb, useCapture);
    }
  
    /**
     * Remove event listener shorthand.
     *
     * @param {Element} el
     * @param {String} event
     * @param {Function} cb
     */
  
    function off(el, event, cb) {
      el.removeEventListener(event, cb);
    }
  
    /**
     * For IE9 compat: when both class and :class are present
     * getAttribute('class') returns wrong value...
     *
     * @param {Element} el
     * @return {String}
     */
  
    function getClass(el) {
      var classname = el.className;
      if (typeof classname === 'object') {
        classname = classname.baseVal || '';
      }
      return classname;
    }
  
    /**
     * In IE9, setAttribute('class') will result in empty class
     * if the element also has the :class attribute; However in
     * PhantomJS, setting `className` does not work on SVG elements...
     * So we have to do a conditional check here.
     *
     * @param {Element} el
     * @param {String} cls
     */
  
    function setClass(el, cls) {
      /* istanbul ignore if */
      if (isIE9 && !/svg$/.test(el.namespaceURI)) {
        el.className = cls;
      } else {
        el.setAttribute('class', cls);
      }
    }
  
    /**
     * Add class with compatibility for IE & SVG
     *
     * @param {Element} el
     * @param {String} cls
     */
  
    function addClass(el, cls) {
      if (el.classList) {
        el.classList.add(cls);
      } else {
        var cur = ' ' + getClass(el) + ' ';
        if (cur.indexOf(' ' + cls + ' ') < 0) {
          setClass(el, (cur + cls).trim());
        }
      }
    }
  
    /**
     * Remove class with compatibility for IE & SVG
     *
     * @param {Element} el
     * @param {String} cls
     */
  
    function removeClass(el, cls) {
      if (el.classList) {
        el.classList.remove(cls);
      } else {
        var cur = ' ' + getClass(el) + ' ';
        var tar = ' ' + cls + ' ';
        while (cur.indexOf(tar) >= 0) {
          cur = cur.replace(tar, ' ');
        }
        setClass(el, cur.trim());
      }
      if (!el.className) {
        el.removeAttribute('class');
      }
    }
  
    /**
     * Extract raw content inside an element into a temporary
     * container div
     *
     * @param {Element} el
     * @param {Boolean} asFragment
     * @return {Element|DocumentFragment}
     */
  
    function extractContent(el, asFragment) {
      var child;
      var rawContent;
      /* istanbul ignore if */
      if (isTemplate(el) && isFragment(el.content)) {
        el = el.content;
      }
      if (el.hasChildNodes()) {
        trimNode(el);
        rawContent = asFragment ? document.createDocumentFragment() : document.createElement('div');
        /* eslint-disable no-cond-assign */
        while (child = el.firstChild) {
          /* eslint-enable no-cond-assign */
          rawContent.appendChild(child);
        }
      }
      return rawContent;
    }
  
    /**
     * Trim possible empty head/tail text and comment
     * nodes inside a parent.
     *
     * @param {Node} node
     */
  
    function trimNode(node) {
      var child;
      /* eslint-disable no-sequences */
      while ((child = node.firstChild, isTrimmable(child))) {
        node.removeChild(child);
      }
      while ((child = node.lastChild, isTrimmable(child))) {
        node.removeChild(child);
      }
      /* eslint-enable no-sequences */
    }
  
    function isTrimmable(node) {
      return node && (node.nodeType === 3 && !node.data.trim() || node.nodeType === 8);
    }
  
    /**
     * Check if an element is a template tag.
     * Note if the template appears inside an SVG its tagName
     * will be in lowercase.
     *
     * @param {Element} el
     */
  
    function isTemplate(el) {
      return el.tagName && el.tagName.toLowerCase() === 'template';
    }
  
    /**
     * Create an "anchor" for performing dom insertion/removals.
     * This is used in a number of scenarios:
     * - fragment instance
     * - v-html
     * - v-if
     * - v-for
     * - component
     *
     * @param {String} content
     * @param {Boolean} persist - IE trashes empty textNodes on
     *                            cloneNode(true), so in certain
     *                            cases the anchor needs to be
     *                            non-empty to be persisted in
     *                            templates.
     * @return {Comment|Text}
     */
  
    function createAnchor(content, persist) {
      var anchor = config.debug ? document.createComment(content) : document.createTextNode(persist ? ' ' : '');
      anchor.__v_anchor = true;
      return anchor;
    }
  
    /**
     * Find a component ref attribute that starts with $.
     *
     * @param {Element} node
     * @return {String|undefined}
     */
  
    var refRE = /^v-ref:/;
  
    function findRef(node) {
      if (node.hasAttributes()) {
        var attrs = node.attributes;
        for (var i = 0, l = attrs.length; i < l; i++) {
          var name = attrs[i].name;
          if (refRE.test(name)) {
            return camelize(name.replace(refRE, ''));
          }
        }
      }
    }
  
    /**
     * Map a function to a range of nodes .
     *
     * @param {Node} node
     * @param {Node} end
     * @param {Function} op
     */
  
    function mapNodeRange(node, end, op) {
      var next;
      while (node !== end) {
        next = node.nextSibling;
        op(node);
        node = next;
      }
      op(end);
    }
  
    /**
     * Remove a range of nodes with transition, store
     * the nodes in a fragment with correct ordering,
     * and call callback when done.
     *
     * @param {Node} start
     * @param {Node} end
     * @param {Vue} vm
     * @param {DocumentFragment} frag
     * @param {Function} cb
     */
  
    function removeNodeRange(start, end, vm, frag, cb) {
      var done = false;
      var removed = 0;
      var nodes = [];
      mapNodeRange(start, end, function (node) {
        if (node === end) done = true;
        nodes.push(node);
        removeWithTransition(node, vm, onRemoved);
      });
      function onRemoved() {
        removed++;
        if (done && removed >= nodes.length) {
          for (var i = 0; i < nodes.length; i++) {
            frag.appendChild(nodes[i]);
          }
          cb && cb();
        }
      }
    }
  
    /**
     * Check if a node is a DocumentFragment.
     *
     * @param {Node} node
     * @return {Boolean}
     */
  
    function isFragment(node) {
      return node && node.nodeType === 11;
    }
  
    /**
     * Get outerHTML of elements, taking care
     * of SVG elements in IE as well.
     *
     * @param {Element} el
     * @return {String}
     */
  
    function getOuterHTML(el) {
      if (el.outerHTML) {
        return el.outerHTML;
      } else {
        var container = document.createElement('div');
        container.appendChild(el.cloneNode(true));
        return container.innerHTML;
      }
    }
  
    var commonTagRE = /^(div|p|span|img|a|b|i|br|ul|ol|li|h1|h2|h3|h4|h5|h6|code|pre|table|th|td|tr|form|label|input|select|option|nav|article|section|header|footer)$/i;
    var reservedTagRE = /^(slot|partial|component)$/i;
  
    var isUnknownElement = undefined;
    if ('development' !== 'production') {
      isUnknownElement = function (el, tag) {
        if (tag.indexOf('-') > -1) {
          // http://stackoverflow.com/a/28210364/1070244
          return el.constructor === window.HTMLUnknownElement || el.constructor === window.HTMLElement;
        } else {
          return (/HTMLUnknownElement/.test(el.toString()) &&
            // Chrome returns unknown for several HTML5 elements.
            // https://code.google.com/p/chromium/issues/detail?id=540526
            // Firefox returns unknown for some "Interactive elements."
            !/^(data|time|rtc|rb|details|dialog|summary)$/.test(tag)
          );
        }
      };
    }
  
    /**
     * Check if an element is a component, if yes return its
     * component id.
     *
     * @param {Element} el
     * @param {Object} options
     * @return {Object|undefined}
     */
  
    function checkComponentAttr(el, options) {
      var tag = el.tagName.toLowerCase();
      var hasAttrs = el.hasAttributes();
      if (!commonTagRE.test(tag) && !reservedTagRE.test(tag)) {
        if (resolveAsset(options, 'components', tag)) {
          return { id: tag };
        } else {
          var is = hasAttrs && getIsBinding(el, options);
          if (is) {
            return is;
          } else if ('development' !== 'production') {
            var expectedTag = options._componentNameMap && options._componentNameMap[tag];
            if (expectedTag) {
              warn('Unknown custom element: <' + tag + '> - ' + 'did you mean <' + expectedTag + '>? ' + 'HTML is case-insensitive, remember to use kebab-case in templates.');
            } else if (isUnknownElement(el, tag)) {
              warn('Unknown custom element: <' + tag + '> - did you ' + 'register the component correctly? For recursive components, ' + 'make sure to provide the "name" option.');
            }
          }
        }
      } else if (hasAttrs) {
        return getIsBinding(el, options);
      }
    }
  
    /**
     * Get "is" binding from an element.
     *
     * @param {Element} el
     * @param {Object} options
     * @return {Object|undefined}
     */
  
    function getIsBinding(el, options) {
      // dynamic syntax
      var exp = el.getAttribute('is');
      if (exp != null) {
        if (resolveAsset(options, 'components', exp)) {
          el.removeAttribute('is');
          return { id: exp };
        }
      } else {
        exp = getBindAttr(el, 'is');
        if (exp != null) {
          return { id: exp, dynamic: true };
        }
      }
    }
  
    /**
     * Option overwriting strategies are functions that handle
     * how to merge a parent option value and a child option
     * value into the final value.
     *
     * All strategy functions follow the same signature:
     *
     * @param {*} parentVal
     * @param {*} childVal
     * @param {Vue} [vm]
     */
  
    var strats = config.optionMergeStrategies = Object.create(null);
  
    /**
     * Helper that recursively merges two data objects together.
     */
  
    function mergeData(to, from) {
      var key, toVal, fromVal;
      for (key in from) {
        toVal = to[key];
        fromVal = from[key];
        if (!hasOwn(to, key)) {
          set(to, key, fromVal);
        } else if (isObject(toVal) && isObject(fromVal)) {
          mergeData(toVal, fromVal);
        }
      }
      return to;
    }
  
    /**
     * Data
     */
  
    strats.data = function (parentVal, childVal, vm) {
      if (!vm) {
        // in a Vue.extend merge, both should be functions
        if (!childVal) {
          return parentVal;
        }
        if (typeof childVal !== 'function') {
          'development' !== 'production' && warn('The "data" option should be a function ' + 'that returns a per-instance value in component ' + 'definitions.', vm);
          return parentVal;
        }
        if (!parentVal) {
          return childVal;
        }
        // when parentVal & childVal are both present,
        // we need to return a function that returns the
        // merged result of both functions... no need to
        // check if parentVal is a function here because
        // it has to be a function to pass previous merges.
        return function mergedDataFn() {
          return mergeData(childVal.call(this), parentVal.call(this));
        };
      } else if (parentVal || childVal) {
        return function mergedInstanceDataFn() {
          // instance merge
          var instanceData = typeof childVal === 'function' ? childVal.call(vm) : childVal;
          var defaultData = typeof parentVal === 'function' ? parentVal.call(vm) : undefined;
          if (instanceData) {
            return mergeData(instanceData, defaultData);
          } else {
            return defaultData;
          }
        };
      }
    };
  
    /**
     * El
     */
  
    strats.el = function (parentVal, childVal, vm) {
      if (!vm && childVal && typeof childVal !== 'function') {
        'development' !== 'production' && warn('The "el" option should be a function ' + 'that returns a per-instance value in component ' + 'definitions.', vm);
        return;
      }
      var ret = childVal || parentVal;
      // invoke the element factory if this is instance merge
      return vm && typeof ret === 'function' ? ret.call(vm) : ret;
    };
  
    /**
     * Hooks and param attributes are merged as arrays.
     */
  
    strats.init = strats.created = strats.ready = strats.attached = strats.detached = strats.beforeCompile = strats.compiled = strats.beforeDestroy = strats.destroyed = strats.activate = function (parentVal, childVal) {
      return childVal ? parentVal ? parentVal.concat(childVal) : isArray(childVal) ? childVal : [childVal] : parentVal;
    };
  
    /**
     * Assets
     *
     * When a vm is present (instance creation), we need to do
     * a three-way merge between constructor options, instance
     * options and parent options.
     */
  
    function mergeAssets(parentVal, childVal) {
      var res = Object.create(parentVal || null);
      return childVal ? extend(res, guardArrayAssets(childVal)) : res;
    }
  
    config._assetTypes.forEach(function (type) {
      strats[type + 's'] = mergeAssets;
    });
  
    /**
     * Events & Watchers.
     *
     * Events & watchers hashes should not overwrite one
     * another, so we merge them as arrays.
     */
  
    strats.watch = strats.events = function (parentVal, childVal) {
      if (!childVal) return parentVal;
      if (!parentVal) return childVal;
      var ret = {};
      extend(ret, parentVal);
      for (var key in childVal) {
        var parent = ret[key];
        var child = childVal[key];
        if (parent && !isArray(parent)) {
          parent = [parent];
        }
        ret[key] = parent ? parent.concat(child) : [child];
      }
      return ret;
    };
  
    /**
     * Other object hashes.
     */
  
    strats.props = strats.methods = strats.computed = function (parentVal, childVal) {
      if (!childVal) return parentVal;
      if (!parentVal) return childVal;
      var ret = Object.create(null);
      extend(ret, parentVal);
      extend(ret, childVal);
      return ret;
    };
  
    /**
     * Default strategy.
     */
  
    var defaultStrat = function defaultStrat(parentVal, childVal) {
      return childVal === undefined ? parentVal : childVal;
    };
  
    /**
     * Make sure component options get converted to actual
     * constructors.
     *
     * @param {Object} options
     */
  
    function guardComponents(options) {
      if (options.components) {
        var components = options.components = guardArrayAssets(options.components);
        var ids = Object.keys(components);
        var def;
        if ('development' !== 'production') {
          var map = options._componentNameMap = {};
        }
        for (var i = 0, l = ids.length; i < l; i++) {
          var key = ids[i];
          if (commonTagRE.test(key) || reservedTagRE.test(key)) {
            'development' !== 'production' && warn('Do not use built-in or reserved HTML elements as component ' + 'id: ' + key);
            continue;
          }
          // record a all lowercase <-> kebab-case mapping for
          // possible custom element case error warning
          if ('development' !== 'production') {
            map[key.replace(/-/g, '').toLowerCase()] = hyphenate(key);
          }
          def = components[key];
          if (isPlainObject(def)) {
            components[key] = Vue.extend(def);
          }
        }
      }
    }
  
    /**
     * Ensure all props option syntax are normalized into the
     * Object-based format.
     *
     * @param {Object} options
     */
  
    function guardProps(options) {
      var props = options.props;
      var i, val;
      if (isArray(props)) {
        options.props = {};
        i = props.length;
        while (i--) {
          val = props[i];
          if (typeof val === 'string') {
            options.props[val] = null;
          } else if (val.name) {
            options.props[val.name] = val;
          }
        }
      } else if (isPlainObject(props)) {
        var keys = Object.keys(props);
        i = keys.length;
        while (i--) {
          val = props[keys[i]];
          if (typeof val === 'function') {
            props[keys[i]] = { type: val };
          }
        }
      }
    }
  
    /**
     * Guard an Array-format assets option and converted it
     * into the key-value Object format.
     *
     * @param {Object|Array} assets
     * @return {Object}
     */
  
    function guardArrayAssets(assets) {
      if (isArray(assets)) {
        var res = {};
        var i = assets.length;
        var asset;
        while (i--) {
          asset = assets[i];
          var id = typeof asset === 'function' ? asset.options && asset.options.name || asset.id : asset.name || asset.id;
          if (!id) {
            'development' !== 'production' && warn('Array-syntax assets must provide a "name" or "id" field.');
          } else {
            res[id] = asset;
          }
        }
        return res;
      }
      return assets;
    }
  
    /**
     * Merge two option objects into a new one.
     * Core utility used in both instantiation and inheritance.
     *
     * @param {Object} parent
     * @param {Object} child
     * @param {Vue} [vm] - if vm is present, indicates this is
     *                     an instantiation merge.
     */
  
    function mergeOptions(parent, child, vm) {
      guardComponents(child);
      guardProps(child);
      if ('development' !== 'production') {
        if (child.propsData && !vm) {
          warn('propsData can only be used as an instantiation option.');
        }
      }
      var options = {};
      var key;
      if (child['extends']) {
        parent = typeof child['extends'] === 'function' ? mergeOptions(parent, child['extends'].options, vm) : mergeOptions(parent, child['extends'], vm);
      }
      if (child.mixins) {
        for (var i = 0, l = child.mixins.length; i < l; i++) {
          var mixin = child.mixins[i];
          var mixinOptions = mixin.prototype instanceof Vue ? mixin.options : mixin;
          parent = mergeOptions(parent, mixinOptions, vm);
        }
      }
      for (key in parent) {
        mergeField(key);
      }
      for (key in child) {
        if (!hasOwn(parent, key)) {
          mergeField(key);
        }
      }
      function mergeField(key) {
        var strat = strats[key] || defaultStrat;
        options[key] = strat(parent[key], child[key], vm, key);
      }
      return options;
    }
  
    /**
     * Resolve an asset.
     * This function is used because child instances need access
     * to assets defined in its ancestor chain.
     *
     * @param {Object} options
     * @param {String} type
     * @param {String} id
     * @param {Boolean} warnMissing
     * @return {Object|Function}
     */
  
    function resolveAsset(options, type, id, warnMissing) {
      /* istanbul ignore if */
      if (typeof id !== 'string') {
        return;
      }
      var assets = options[type];
      var camelizedId;
      var res = assets[id] ||
      // camelCase ID
      assets[camelizedId = camelize(id)] ||
      // Pascal Case ID
      assets[camelizedId.charAt(0).toUpperCase() + camelizedId.slice(1)];
      if ('development' !== 'production' && warnMissing && !res) {
        warn('Failed to resolve ' + type.slice(0, -1) + ': ' + id, options);
      }
      return res;
    }
  
    var uid$1 = 0;
  
    /**
     * A dep is an observable that can have multiple
     * directives subscribing to it.
     *
     * @constructor
     */
    function Dep() {
      this.id = uid$1++;
      this.subs = [];
    }
  
    // the current target watcher being evaluated.
    // this is globally unique because there could be only one
    // watcher being evaluated at any time.
    Dep.target = null;
  
    /**
     * Add a directive subscriber.
     *
     * @param {Directive} sub
     */
  
    Dep.prototype.addSub = function (sub) {
      this.subs.push(sub);
    };
  
    /**
     * Remove a directive subscriber.
     *
     * @param {Directive} sub
     */
  
    Dep.prototype.removeSub = function (sub) {
      this.subs.$remove(sub);
    };
  
    /**
     * Add self as a dependency to the target watcher.
     */
  
    Dep.prototype.depend = function () {
      Dep.target.addDep(this);
    };
  
    /**
     * Notify all subscribers of a new value.
     */
  
    Dep.prototype.notify = function () {
      // stablize the subscriber list first
      var subs = toArray(this.subs);
      for (var i = 0, l = subs.length; i < l; i++) {
        subs[i].update();
      }
    };
  
    var arrayProto = Array.prototype;
    var arrayMethods = Object.create(arrayProto)
  
    /**
     * Intercept mutating methods and emit events
     */
  
    ;['push', 'pop', 'shift', 'unshift', 'splice', 'sort', 'reverse'].forEach(function (method) {
      // cache original method
      var original = arrayProto[method];
      def(arrayMethods, method, function mutator() {
        // avoid leaking arguments:
        // http://jsperf.com/closure-with-arguments
        var i = arguments.length;
        var args = new Array(i);
        while (i--) {
          args[i] = arguments[i];
        }
        var result = original.apply(this, args);
        var ob = this.__ob__;
        var inserted;
        switch (method) {
          case 'push':
            inserted = args;
            break;
          case 'unshift':
            inserted = args;
            break;
          case 'splice':
            inserted = args.slice(2);
            break;
        }
        if (inserted) ob.observeArray(inserted);
        // notify change
        ob.dep.notify();
        return result;
      });
    });
  
    /**
     * Swap the element at the given index with a new value
     * and emits corresponding event.
     *
     * @param {Number} index
     * @param {*} val
     * @return {*} - replaced element
     */
  
    def(arrayProto, '$set', function $set(index, val) {
      if (index >= this.length) {
        this.length = Number(index) + 1;
      }
      return this.splice(index, 1, val)[0];
    });
  
    /**
     * Convenience method to remove the element at given index or target element reference.
     *
     * @param {*} item
     */
  
    def(arrayProto, '$remove', function $remove(item) {
      /* istanbul ignore if */
      if (!this.length) return;
      var index = indexOf(this, item);
      if (index > -1) {
        return this.splice(index, 1);
      }
    });
  
    var arrayKeys = Object.getOwnPropertyNames(arrayMethods);
  
    /**
     * By default, when a reactive property is set, the new value is
     * also converted to become reactive. However in certain cases, e.g.
     * v-for scope alias and props, we don't want to force conversion
     * because the value may be a nested value under a frozen data structure.
     *
     * So whenever we want to set a reactive property without forcing
     * conversion on the new value, we wrap that call inside this function.
     */
  
    var shouldConvert = true;
  
    function withoutConversion(fn) {
      shouldConvert = false;
      fn();
      shouldConvert = true;
    }
  
    /**
     * Observer class that are attached to each observed
     * object. Once attached, the observer converts target
     * object's property keys into getter/setters that
     * collect dependencies and dispatches updates.
     *
     * @param {Array|Object} value
     * @constructor
     */
  
    function Observer(value) {
      this.value = value;
      this.dep = new Dep();
      def(value, '__ob__', this);
      if (isArray(value)) {
        var augment = hasProto ? protoAugment : copyAugment;
        augment(value, arrayMethods, arrayKeys);
        this.observeArray(value);
      } else {
        this.walk(value);
      }
    }
  
    // Instance methods
  
    /**
     * Walk through each property and convert them into
     * getter/setters. This method should only be called when
     * value type is Object.
     *
     * @param {Object} obj
     */
  
    Observer.prototype.walk = function (obj) {
      var keys = Object.keys(obj);
      for (var i = 0, l = keys.length; i < l; i++) {
        this.convert(keys[i], obj[keys[i]]);
      }
    };
  
    /**
     * Observe a list of Array items.
     *
     * @param {Array} items
     */
  
    Observer.prototype.observeArray = function (items) {
      for (var i = 0, l = items.length; i < l; i++) {
        observe(items[i]);
      }
    };
  
    /**
     * Convert a property into getter/setter so we can emit
     * the events when the property is accessed/changed.
     *
     * @param {String} key
     * @param {*} val
     */
  
    Observer.prototype.convert = function (key, val) {
      defineReactive(this.value, key, val);
    };
  
    /**
     * Add an owner vm, so that when $set/$delete mutations
     * happen we can notify owner vms to proxy the keys and
     * digest the watchers. This is only called when the object
     * is observed as an instance's root $data.
     *
     * @param {Vue} vm
     */
  
    Observer.prototype.addVm = function (vm) {
      (this.vms || (this.vms = [])).push(vm);
    };
  
    /**
     * Remove an owner vm. This is called when the object is
     * swapped out as an instance's $data object.
     *
     * @param {Vue} vm
     */
  
    Observer.prototype.removeVm = function (vm) {
      this.vms.$remove(vm);
    };
  
    // helpers
  
    /**
     * Augment an target Object or Array by intercepting
     * the prototype chain using __proto__
     *
     * @param {Object|Array} target
     * @param {Object} src
     */
  
    function protoAugment(target, src) {
      /* eslint-disable no-proto */
      target.__proto__ = src;
      /* eslint-enable no-proto */
    }
  
    /**
     * Augment an target Object or Array by defining
     * hidden properties.
     *
     * @param {Object|Array} target
     * @param {Object} proto
     */
  
    function copyAugment(target, src, keys) {
      for (var i = 0, l = keys.length; i < l; i++) {
        var key = keys[i];
        def(target, key, src[key]);
      }
    }
  
    /**
     * Attempt to create an observer instance for a value,
     * returns the new observer if successfully observed,
     * or the existing observer if the value already has one.
     *
     * @param {*} value
     * @param {Vue} [vm]
     * @return {Observer|undefined}
     * @static
     */
  
    function observe(value, vm) {
      if (!value || typeof value !== 'object') {
        return;
      }
      var ob;
      if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
        ob = value.__ob__;
      } else if (shouldConvert && (isArray(value) || isPlainObject(value)) && Object.isExtensible(value) && !value._isVue) {
        ob = new Observer(value);
      }
      if (ob && vm) {
        ob.addVm(vm);
      }
      return ob;
    }
  
    /**
     * Define a reactive property on an Object.
     *
     * @param {Object} obj
     * @param {String} key
     * @param {*} val
     */
  
    function defineReactive(obj, key, val) {
      var dep = new Dep();
  
      var property = Object.getOwnPropertyDescriptor(obj, key);
      if (property && property.configurable === false) {
        return;
      }
  
      // cater for pre-defined getter/setters
      var getter = property && property.get;
      var setter = property && property.set;
  
      var childOb = observe(val);
      Object.defineProperty(obj, key, {
        enumerable: true,
        configurable: true,
        get: function reactiveGetter() {
          var value = getter ? getter.call(obj) : val;
          if (Dep.target) {
            dep.depend();
            if (childOb) {
              childOb.dep.depend();
            }
            if (isArray(value)) {
              for (var e, i = 0, l = value.length; i < l; i++) {
                e = value[i];
                e && e.__ob__ && e.__ob__.dep.depend();
              }
            }
          }
          return value;
        },
        set: function reactiveSetter(newVal) {
          var value = getter ? getter.call(obj) : val;
          if (newVal === value) {
            return;
          }
          if (setter) {
            setter.call(obj, newVal);
          } else {
            val = newVal;
          }
          childOb = observe(newVal);
          dep.notify();
        }
      });
    }
  
  
  
    var util = Object.freeze({
      defineReactive: defineReactive,
      set: set,
      del: del,
      hasOwn: hasOwn,
      isLiteral: isLiteral,
      isReserved: isReserved,
      _toString: _toString,
      toNumber: toNumber,
      toBoolean: toBoolean,
      stripQuotes: stripQuotes,
      camelize: camelize,
      hyphenate: hyphenate,
      classify: classify,
      bind: bind,
      toArray: toArray,
      extend: extend,
      isObject: isObject,
      isPlainObject: isPlainObject,
      def: def,
      debounce: _debounce,
      indexOf: indexOf,
      cancellable: cancellable,
      looseEqual: looseEqual,
      isArray: isArray,
      hasProto: hasProto,
      inBrowser: inBrowser,
      devtools: devtools,
      isIE: isIE,
      isIE9: isIE9,
      isAndroid: isAndroid,
      isIos: isIos,
      iosVersionMatch: iosVersionMatch,
      iosVersion: iosVersion,
      hasMutationObserverBug: hasMutationObserverBug,
      get transitionProp () { return transitionProp; },
      get transitionEndEvent () { return transitionEndEvent; },
      get animationProp () { return animationProp; },
      get animationEndEvent () { return animationEndEvent; },
      nextTick: nextTick,
      get _Set () { return _Set; },
      query: query,
      inDoc: inDoc,
      getAttr: getAttr,
      getBindAttr: getBindAttr,
      hasBindAttr: hasBindAttr,
      before: before,
      after: after,
      remove: remove,
      prepend: prepend,
      replace: replace,
      on: on,
      off: off,
      setClass: setClass,
      addClass: addClass,
      removeClass: removeClass,
      extractContent: extractContent,
      trimNode: trimNode,
      isTemplate: isTemplate,
      createAnchor: createAnchor,
      findRef: findRef,
      mapNodeRange: mapNodeRange,
      removeNodeRange: removeNodeRange,
      isFragment: isFragment,
      getOuterHTML: getOuterHTML,
      mergeOptions: mergeOptions,
      resolveAsset: resolveAsset,
      checkComponentAttr: checkComponentAttr,
      commonTagRE: commonTagRE,
      reservedTagRE: reservedTagRE,
      get warn () { return warn; }
    });
  
    var uid = 0;
  
    function initMixin (Vue) {
      /**
       * The main init sequence. This is called for every
       * instance, including ones that are created from extended
       * constructors.
       *
       * @param {Object} options - this options object should be
       *                           the result of merging class
       *                           options and the options passed
       *                           in to the constructor.
       */
  
      Vue.prototype._init = function (options) {
        options = options || {};
  
        this.$el = null;
        this.$parent = options.parent;
        this.$root = this.$parent ? this.$parent.$root : this;
        this.$children = [];
        this.$refs = {}; // child vm references
        this.$els = {}; // element references
        this._watchers = []; // all watchers as an array
        this._directives = []; // all directives
  
        // a uid
        this._uid = uid++;
  
        // a flag to avoid this being observed
        this._isVue = true;
  
        // events bookkeeping
        this._events = {}; // registered callbacks
        this._eventsCount = {}; // for $broadcast optimization
  
        // fragment instance properties
        this._isFragment = false;
        this._fragment = // @type {DocumentFragment}
        this._fragmentStart = // @type {Text|Comment}
        this._fragmentEnd = null; // @type {Text|Comment}
  
        // lifecycle state
        this._isCompiled = this._isDestroyed = this._isReady = this._isAttached = this._isBeingDestroyed = this._vForRemoving = false;
        this._unlinkFn = null;
  
        // context:
        // if this is a transcluded component, context
        // will be the common parent vm of this instance
        // and its host.
        this._context = options._context || this.$parent;
  
        // scope:
        // if this is inside an inline v-for, the scope
        // will be the intermediate scope created for this
        // repeat fragment. this is used for linking props
        // and container directives.
        this._scope = options._scope;
  
        // fragment:
        // if this instance is compiled inside a Fragment, it
        // needs to reigster itself as a child of that fragment
        // for attach/detach to work properly.
        this._frag = options._frag;
        if (this._frag) {
          this._frag.children.push(this);
        }
  
        // push self into parent / transclusion host
        if (this.$parent) {
          this.$parent.$children.push(this);
        }
  
        // merge options.
        options = this.$options = mergeOptions(this.constructor.options, options, this);
  
        // set ref
        this._updateRef();
  
        // initialize data as empty object.
        // it will be filled up in _initData().
        this._data = {};
  
        // call init hook
        this._callHook('init');
  
        // initialize data observation and scope inheritance.
        this._initState();
  
        // setup event system and option events.
        this._initEvents();
  
        // call created hook
        this._callHook('created');
  
        // if `el` option is passed, start compilation.
        if (options.el) {
          this.$mount(options.el);
        }
      };
    }
  
    var __commonjs_global = typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : this;
    var primitives = (function (module, global) {
    var exports = module.exports;
    var names = ['Object', 'String', 'Boolean', 'Number', 'RegExp', 'Date', 'Array']
    var immutable = {string: 'String', boolean: 'Boolean', number: 'Number' }
  
    var primitives = names.map(getGlobal)
    var protos = primitives.map(getProto)
  
    var protoReplacements = {}
  
    module.exports = Primitives
  
    function Primitives(context){
      if (this instanceof Primitives){
        this.context = context
        for (var i=0;i<names.length;i++){
          if (!this.context[names[i]]){
            this.context[names[i]] = wrap(primitives[i])
          }
        }
      } else {
        return new Primitives(context)
      }
    }
  
    Primitives.prototype.replace = function(value){
      var primIndex = primitives.indexOf(value)
      var protoIndex = protos.indexOf(value)
  
      if (~primIndex){
        var name = names[primIndex]
        return this.context[name]
      } else if (~protoIndex) {
        var name = names[protoIndex]
        return this.context[name].prototype
      } else  {
        return value
      }
    }
  
    Primitives.prototype.getPropertyObject = function(object, property){
      if (immutable[typeof object]){
        return this.getPrototypeOf(object)
      }
      return object
    }
  
    Primitives.prototype.isPrimitive = function(value){
      return !!~primitives.indexOf(value) || !!~protos.indexOf(value)
    }
  
    Primitives.prototype.getPrototypeOf = function(value){
      if (value == null){ // handle null and undefined
        return value
      }
  
      var immutableType = immutable[typeof value]
      if (immutableType){
        var proto = this.context[immutableType].prototype
      } else {
        var proto = Object.getPrototypeOf(value)
      }
  
      if (!proto || proto === Object.prototype){
        return null
      } else {
        var replacement = this.replace(proto)
        if (replacement === value){
          replacement = this.replace(Object.prototype)
        }
        return replacement
      }
    }
  
    Primitives.prototype.applyNew = function(func, args){
      if (func.wrapped){
        var prim = Object.getPrototypeOf(func)
        var instance = new (Function.prototype.bind.apply(prim, arguments))
        setProto(instance, func.prototype)
        return instance
      } else {
        return new (Function.prototype.bind.apply(func, arguments))
      }
    }
  
    function getProto(func){
      return func.prototype
    }
  
    function getGlobal(str){
      return global[str]
    }
  
    function setProto(obj, proto){
      obj.__proto__ = proto
    }
  
    function wrap(prim){
      var proto = Object.create(prim.prototype)
  
      var result = function() {
        if (this instanceof result){
          prim.apply(this, arguments)
        } else {
          var instance = prim.apply(null, arguments)
          setProto(instance, proto)
          return instance
        }
      }
      setProto(result, prim)
      result.prototype = proto
      result.wrapped = true
      return result
    }
    return module.exports;
    })({exports:{}}, __commonjs_global);
  
    var infiniteChecker = (function (module) {
    var exports = module.exports;
    module.exports = InfiniteChecker
  
    function InfiniteChecker(maxIterations){
      if (this instanceof InfiniteChecker){
        this.maxIterations = maxIterations
        this.count = 0
      } else {
        return new InfiniteChecker(maxIterations)
      }
    }
  
    InfiniteChecker.prototype.check = function(){
      this.count += 1
      if (this.count > this.maxIterations){
        throw new Error('Infinite loop detected - reached max iterations')
      }
    }
    return module.exports;
    })({exports:{}});
  
    var index$1 = (function (module) {
    var exports = module.exports;
    module.exports = hoist
  
    function hoist(ast){
  
      var parentStack = []
      var variables = []
      var functions = []
  
      if (Array.isArray(ast)){
  
        walkAll(ast)
        prependScope(ast, variables, functions)
  
      } else {
        walk(ast)
      }
  
      return ast
  
      // walk through each node of a program of block statement
      function walkAll(nodes){
        var result = null
        for (var i=0;i<nodes.length;i++){
          var childNode = nodes[i]
          if (childNode.type === 'EmptyStatement') continue
          var result = walk(childNode)
          if (result === 'remove'){
            nodes.splice(i--, 1)
          }
        }
      }
  
      function walk(node){
        var parent = parentStack[parentStack.length-1]
        var remove = false
        parentStack.push(node)
  
        var excludeBody = false
        if (shouldScope(node, parent)){
          hoist(node.body)
          excludeBody = true
        }
  
        if (node.type === 'VariableDeclarator'){
          variables.push(node)
        }
  
        if (node.type === 'FunctionDeclaration'){
          functions.push(node)
          remove = true
        }
  
        for (var key in node){
          if (key === 'type' || (excludeBody && key === 'body')) continue
          if (key in node && node[key] && typeof node[key] == 'object'){
            if (node[key].type){
              walk(node[key])
            } else if (Array.isArray(node[key])){
              walkAll(node[key])
            }
          }
        }
  
        parentStack.pop()
        if (remove){
          return 'remove'
        }
      }
    }
  
    function shouldScope(node, parent){
      if (node.type === 'Program'){
        return true
      } else if (node.type === 'BlockStatement'){
        if (parent && (parent.type === 'FunctionExpression' || parent.type === 'FunctionDeclaration')){
          return true
        }
      }
    }
  
    function prependScope(nodes, variables, functions){
      if (variables && variables.length){
        var declarations = []
        for (var i=0;i<variables.length;i++){
          declarations.push({
            type: 'VariableDeclarator',
            id: variables[i].id,
            init: null
          })
        }
  
        nodes.unshift({
          type: 'VariableDeclaration',
          kind: 'var',
          declarations: declarations
        })
  
      }
  
      if (functions && functions.length){
        for (var i=0;i<functions.length;i++){
          nodes.unshift(functions[i])
        }
      }
    }
    return module.exports;
    })({exports:{}});
  
    var esprima = (function (module) {
    var exports = module.exports;
    /*
      Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>
      Copyright (C) 2012 Mathias Bynens <mathias@qiwi.be>
      Copyright (C) 2012 Joost-Wim Boekesteijn <joost-wim@boekesteijn.nl>
      Copyright (C) 2012 Kris Kowal <kris.kowal@cixar.com>
      Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com>
      Copyright (C) 2012 Arpad Borsos <arpad.borsos@googlemail.com>
      Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@gmail.com>
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are met:
  
        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * Redistributions in binary form must reproduce the above copyright
          notice, this list of conditions and the following disclaimer in the
          documentation and/or other materials provided with the distribution.
  
      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
      AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
      DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
      (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
      LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
      ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    */
  
    /*jslint bitwise:true plusplus:true */
    /*global esprima:true, define:true, exports:true, window: true,
    throwError: true, createLiteral: true, generateStatement: true,
    parseAssignmentExpression: true, parseBlock: true, parseExpression: true,
    parseFunctionDeclaration: true, parseFunctionExpression: true,
    parseFunctionSourceElements: true, parseVariableIdentifier: true,
    parseLeftHandSideExpression: true,
    parseStatement: true, parseSourceElement: true */
  
    (function (root, factory) {
        'use strict';
  
        // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js,
        // Rhino, and plain browser loading.
        if (typeof define === 'function' && define.amd) {
            define(['exports'], factory);
        } else if (typeof exports !== 'undefined') {
            factory(exports);
        } else {
            factory((root.esprima = {}));
        }
    }(this, function (exports) {
        'use strict';
  
        var Token,
            TokenName,
            Syntax,
            PropertyKind,
            Messages,
            Regex,
            source,
            strict,
            index,
            lineNumber,
            lineStart,
            length,
            buffer,
            state,
            extra;
  
        Token = {
            BooleanLiteral: 1,
            EOF: 2,
            Identifier: 3,
            Keyword: 4,
            NullLiteral: 5,
            NumericLiteral: 6,
            Punctuator: 7,
            StringLiteral: 8
        };
  
        TokenName = {};
        TokenName[Token.BooleanLiteral] = 'Boolean';
        TokenName[Token.EOF] = '<end>';
        TokenName[Token.Identifier] = 'Identifier';
        TokenName[Token.Keyword] = 'Keyword';
        TokenName[Token.NullLiteral] = 'Null';
        TokenName[Token.NumericLiteral] = 'Numeric';
        TokenName[Token.Punctuator] = 'Punctuator';
        TokenName[Token.StringLiteral] = 'String';
  
        Syntax = {
            AssignmentExpression: 'AssignmentExpression',
            ArrayExpression: 'ArrayExpression',
            BlockStatement: 'BlockStatement',
            BinaryExpression: 'BinaryExpression',
            BreakStatement: 'BreakStatement',
            CallExpression: 'CallExpression',
            CatchClause: 'CatchClause',
            ConditionalExpression: 'ConditionalExpression',
            ContinueStatement: 'ContinueStatement',
            DoWhileStatement: 'DoWhileStatement',
            DebuggerStatement: 'DebuggerStatement',
            EmptyStatement: 'EmptyStatement',
            ExpressionStatement: 'ExpressionStatement',
            ForStatement: 'ForStatement',
            ForInStatement: 'ForInStatement',
            FunctionDeclaration: 'FunctionDeclaration',
            FunctionExpression: 'FunctionExpression',
            Identifier: 'Identifier',
            IfStatement: 'IfStatement',
            Literal: 'Literal',
            LabeledStatement: 'LabeledStatement',
            LogicalExpression: 'LogicalExpression',
            MemberExpression: 'MemberExpression',
            NewExpression: 'NewExpression',
            ObjectExpression: 'ObjectExpression',
            Program: 'Program',
            Property: 'Property',
            ReturnStatement: 'ReturnStatement',
            SequenceExpression: 'SequenceExpression',
            SwitchStatement: 'SwitchStatement',
            SwitchCase: 'SwitchCase',
            ThisExpression: 'ThisExpression',
            ThrowStatement: 'ThrowStatement',
            TryStatement: 'TryStatement',
            UnaryExpression: 'UnaryExpression',
            UpdateExpression: 'UpdateExpression',
            VariableDeclaration: 'VariableDeclaration',
            VariableDeclarator: 'VariableDeclarator',
            WhileStatement: 'WhileStatement',
            WithStatement: 'WithStatement'
        };
  
        PropertyKind = {
            Data: 1,
            Get: 2,
            Set: 4
        };
  
        // Error messages should be identical to V8.
        Messages = {
            UnexpectedToken:  'Unexpected token %0',
            UnexpectedNumber:  'Unexpected number',
            UnexpectedString:  'Unexpected string',
            UnexpectedIdentifier:  'Unexpected identifier',
            UnexpectedReserved:  'Unexpected reserved word',
            UnexpectedEOS:  'Unexpected end of input',
            NewlineAfterThrow:  'Illegal newline after throw',
            InvalidRegExp: 'Invalid regular expression',
            UnterminatedRegExp:  'Invalid regular expression: missing /',
            InvalidLHSInAssignment:  'Invalid left-hand side in assignment',
            InvalidLHSInForIn:  'Invalid left-hand side in for-in',
            MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
            NoCatchOrFinally:  'Missing catch or finally after try',
            UnknownLabel: 'Undefined label \'%0\'',
            Redeclaration: '%0 \'%1\' has already been declared',
            IllegalContinue: 'Illegal continue statement',
            IllegalBreak: 'Illegal break statement',
            IllegalReturn: 'Illegal return statement',
            StrictModeWith:  'Strict mode code may not include a with statement',
            StrictCatchVariable:  'Catch variable may not be eval or arguments in strict mode',
            StrictVarName:  'Variable name may not be eval or arguments in strict mode',
            StrictParamName:  'Parameter name eval or arguments is not allowed in strict mode',
            StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
            StrictFunctionName:  'Function name may not be eval or arguments in strict mode',
            StrictOctalLiteral:  'Octal literals are not allowed in strict mode.',
            StrictDelete:  'Delete of an unqualified identifier in strict mode.',
            StrictDuplicateProperty:  'Duplicate data property in object literal not allowed in strict mode',
            AccessorDataProperty:  'Object literal may not have data and accessor property with the same name',
            AccessorGetSet:  'Object literal may not have multiple get/set accessors with the same name',
            StrictLHSAssignment:  'Assignment to eval or arguments is not allowed in strict mode',
            StrictLHSPostfix:  'Postfix increment/decrement may not have eval or arguments operand in strict mode',
            StrictLHSPrefix:  'Prefix increment/decrement may not have eval or arguments operand in strict mode',
            StrictReservedWord:  'Use of future reserved word in strict mode'
        };
  
        // See also tools/generate-unicode-regex.py.
        Regex = {
            NonAsciiIdentifierStart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]'),
            NonAsciiIdentifierPart: new 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\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]')
        };
  
        // Ensure the condition is true, otherwise throw an error.
        // This is only to have a better contract semantic, i.e. another safety net
        // to catch a logic error. The condition shall be fulfilled in normal case.
        // Do NOT use this to enforce a certain condition on any user input.
  
        function assert(condition, message) {
            if (!condition) {
                throw new Error('ASSERT: ' + message);
            }
        }
  
        function sliceSource(from, to) {
            return source.slice(from, to);
        }
  
        if (typeof 'esprima'[0] === 'undefined') {
            sliceSource = function sliceArraySource(from, to) {
                return source.slice(from, to).join('');
            };
        }
  
        function isDecimalDigit(ch) {
            return '0123456789'.indexOf(ch) >= 0;
        }
  
        function isHexDigit(ch) {
            return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
        }
  
        function isOctalDigit(ch) {
            return '01234567'.indexOf(ch) >= 0;
        }
  
  
        // 7.2 White Space
  
        function isWhiteSpace(ch) {
            return (ch === ' ') || (ch === '\u0009') || (ch === '\u000B') ||
                (ch === '\u000C') || (ch === '\u00A0') ||
                (ch.charCodeAt(0) >= 0x1680 &&
                 '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF'.indexOf(ch) >= 0);
        }
  
        // 7.3 Line Terminators
  
        function isLineTerminator(ch) {
            return (ch === '\n' || ch === '\r' || ch === '\u2028' || ch === '\u2029');
        }
  
        // 7.6 Identifier Names and Identifiers
  
        function isIdentifierStart(ch) {
            return (ch === '$') || (ch === '_') || (ch === '\\') ||
                (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
                ((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierStart.test(ch));
        }
  
        function isIdentifierPart(ch) {
            return (ch === '$') || (ch === '_') || (ch === '\\') ||
                (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
                ((ch >= '0') && (ch <= '9')) ||
                ((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierPart.test(ch));
        }
  
        // 7.6.1.2 Future Reserved Words
  
        function isFutureReservedWord(id) {
            switch (id) {
  
            // Future reserved words.
            case 'class':
            case 'enum':
            case 'export':
            case 'extends':
            case 'import':
            case 'super':
                return true;
            }
  
            return false;
        }
  
        function isStrictModeReservedWord(id) {
            switch (id) {
  
            // Strict Mode reserved words.
            case 'implements':
            case 'interface':
            case 'package':
            case 'private':
            case 'protected':
            case 'public':
            case 'static':
            case 'yield':
            case 'let':
                return true;
            }
  
            return false;
        }
  
        function isRestrictedWord(id) {
            return id === 'eval' || id === 'arguments';
        }
  
        // 7.6.1.1 Keywords
  
        function isKeyword(id) {
            var keyword = false;
            switch (id.length) {
            case 2:
                keyword = (id === 'if') || (id === 'in') || (id === 'do');
                break;
            case 3:
                keyword = (id === 'var') || (id === 'for') || (id === 'new') || (id === 'try');
                break;
            case 4:
                keyword = (id === 'this') || (id === 'else') || (id === 'case') || (id === 'void') || (id === 'with');
                break;
            case 5:
                keyword = (id === 'while') || (id === 'break') || (id === 'catch') || (id === 'throw');
                break;
            case 6:
                keyword = (id === 'return') || (id === 'typeof') || (id === 'delete') || (id === 'switch');
                break;
            case 7:
                keyword = (id === 'default') || (id === 'finally');
                break;
            case 8:
                keyword = (id === 'function') || (id === 'continue') || (id === 'debugger');
                break;
            case 10:
                keyword = (id === 'instanceof');
                break;
            }
  
            if (keyword) {
                return true;
            }
  
            switch (id) {
            // Future reserved words.
            // 'const' is specialized as Keyword in V8.
            case 'const':
                return true;
  
            // For compatiblity to SpiderMonkey and ES.next
            case 'yield':
            case 'let':
                return true;
            }
  
            if (strict && isStrictModeReservedWord(id)) {
                return true;
            }
  
            return isFutureReservedWord(id);
        }
  
        // 7.4 Comments
  
        function skipComment() {
            var ch, blockComment, lineComment;
  
            blockComment = false;
            lineComment = false;
  
            while (index < length) {
                ch = source[index];
  
                if (lineComment) {
                    ch = source[index++];
                    if (isLineTerminator(ch)) {
                        lineComment = false;
                        if (ch === '\r' && source[index] === '\n') {
                            ++index;
                        }
                        ++lineNumber;
                        lineStart = index;
                    }
                } else if (blockComment) {
                    if (isLineTerminator(ch)) {
                        if (ch === '\r' && source[index + 1] === '\n') {
                            ++index;
                        }
                        ++lineNumber;
                        ++index;
                        lineStart = index;
                        if (index >= length) {
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
                    } else {
                        ch = source[index++];
                        if (index >= length) {
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
                        if (ch === '*') {
                            ch = source[index];
                            if (ch === '/') {
                                ++index;
                                blockComment = false;
                            }
                        }
                    }
                } else if (ch === '/') {
                    ch = source[index + 1];
                    if (ch === '/') {
                        index += 2;
                        lineComment = true;
                    } else if (ch === '*') {
                        index += 2;
                        blockComment = true;
                        if (index >= length) {
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
                    } else {
                        break;
                    }
                } else if (isWhiteSpace(ch)) {
                    ++index;
                } else if (isLineTerminator(ch)) {
                    ++index;
                    if (ch ===  '\r' && source[index] === '\n') {
                        ++index;
                    }
                    ++lineNumber;
                    lineStart = index;
                } else {
                    break;
                }
            }
        }
  
        function scanHexEscape(prefix) {
            var i, len, ch, code = 0;
  
            len = (prefix === 'u') ? 4 : 2;
            for (i = 0; i < len; ++i) {
                if (index < length && isHexDigit(source[index])) {
                    ch = source[index++];
                    code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
                } else {
                    return '';
                }
            }
            return String.fromCharCode(code);
        }
  
        function scanIdentifier() {
            var ch, start, id, restore;
  
            ch = source[index];
            if (!isIdentifierStart(ch)) {
                return;
            }
  
            start = index;
            if (ch === '\\') {
                ++index;
                if (source[index] !== 'u') {
                    return;
                }
                ++index;
                restore = index;
                ch = scanHexEscape('u');
                if (ch) {
                    if (ch === '\\' || !isIdentifierStart(ch)) {
                        return;
                    }
                    id = ch;
                } else {
                    index = restore;
                    id = 'u';
                }
            } else {
                id = source[index++];
            }
  
            while (index < length) {
                ch = source[index];
                if (!isIdentifierPart(ch)) {
                    break;
                }
                if (ch === '\\') {
                    ++index;
                    if (source[index] !== 'u') {
                        return;
                    }
                    ++index;
                    restore = index;
                    ch = scanHexEscape('u');
                    if (ch) {
                        if (ch === '\\' || !isIdentifierPart(ch)) {
                            return;
                        }
                        id += ch;
                    } else {
                        index = restore;
                        id += 'u';
                    }
                } else {
                    id += source[index++];
                }
            }
  
            // There is no keyword or literal with only one character.
            // Thus, it must be an identifier.
            if (id.length === 1) {
                return {
                    type: Token.Identifier,
                    value: id,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            if (isKeyword(id)) {
                return {
                    type: Token.Keyword,
                    value: id,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            // 7.8.1 Null Literals
  
            if (id === 'null') {
                return {
                    type: Token.NullLiteral,
                    value: id,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            // 7.8.2 Boolean Literals
  
            if (id === 'true' || id === 'false') {
                return {
                    type: Token.BooleanLiteral,
                    value: id,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            return {
                type: Token.Identifier,
                value: id,
                lineNumber: lineNumber,
                lineStart: lineStart,
                range: [start, index]
            };
        }
  
        // 7.7 Punctuators
  
        function scanPunctuator() {
            var start = index,
                ch1 = source[index],
                ch2,
                ch3,
                ch4;
  
            // Check for most common single-character punctuators.
  
            if (ch1 === ';' || ch1 === '{' || ch1 === '}') {
                ++index;
                return {
                    type: Token.Punctuator,
                    value: ch1,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            if (ch1 === ',' || ch1 === '(' || ch1 === ')') {
                ++index;
                return {
                    type: Token.Punctuator,
                    value: ch1,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            // Dot (.) can also start a floating-point number, hence the need
            // to check the next character.
  
            ch2 = source[index + 1];
            if (ch1 === '.' && !isDecimalDigit(ch2)) {
                return {
                    type: Token.Punctuator,
                    value: source[index++],
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            // Peek more characters.
  
            ch3 = source[index + 2];
            ch4 = source[index + 3];
  
            // 4-character punctuator: >>>=
  
            if (ch1 === '>' && ch2 === '>' && ch3 === '>') {
                if (ch4 === '=') {
                    index += 4;
                    return {
                        type: Token.Punctuator,
                        value: '>>>=',
                        lineNumber: lineNumber,
                        lineStart: lineStart,
                        range: [start, index]
                    };
                }
            }
  
            // 3-character punctuators: === !== >>> <<= >>=
  
            if (ch1 === '=' && ch2 === '=' && ch3 === '=') {
                index += 3;
                return {
                    type: Token.Punctuator,
                    value: '===',
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            if (ch1 === '!' && ch2 === '=' && ch3 === '=') {
                index += 3;
                return {
                    type: Token.Punctuator,
                    value: '!==',
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            if (ch1 === '>' && ch2 === '>' && ch3 === '>') {
                index += 3;
                return {
                    type: Token.Punctuator,
                    value: '>>>',
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            if (ch1 === '<' && ch2 === '<' && ch3 === '=') {
                index += 3;
                return {
                    type: Token.Punctuator,
                    value: '<<=',
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            if (ch1 === '>' && ch2 === '>' && ch3 === '=') {
                index += 3;
                return {
                    type: Token.Punctuator,
                    value: '>>=',
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
  
            // 2-character punctuators: <= >= == != ++ -- << >> && ||
            // += -= *= %= &= |= ^= /=
  
            if (ch2 === '=') {
                if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) {
                    index += 2;
                    return {
                        type: Token.Punctuator,
                        value: ch1 + ch2,
                        lineNumber: lineNumber,
                        lineStart: lineStart,
                        range: [start, index]
                    };
                }
            }
  
            if (ch1 === ch2 && ('+-<>&|'.indexOf(ch1) >= 0)) {
                if ('+-<>&|'.indexOf(ch2) >= 0) {
                    index += 2;
                    return {
                        type: Token.Punctuator,
                        value: ch1 + ch2,
                        lineNumber: lineNumber,
                        lineStart: lineStart,
                        range: [start, index]
                    };
                }
            }
  
            // The remaining 1-character punctuators.
  
            if ('[]<>+-*%&|^!~?:=/'.indexOf(ch1) >= 0) {
                return {
                    type: Token.Punctuator,
                    value: source[index++],
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [start, index]
                };
            }
        }
  
        // 7.8.3 Numeric Literals
  
        function scanNumericLiteral() {
            var number, start, ch;
  
            ch = source[index];
            assert(isDecimalDigit(ch) || (ch === '.'),
                'Numeric literal must start with a decimal digit or a decimal point');
  
            start = index;
            number = '';
            if (ch !== '.') {
                number = source[index++];
                ch = source[index];
  
                // Hex number starts with '0x'.
                // Octal number starts with '0'.
                if (number === '0') {
                    if (ch === 'x' || ch === 'X') {
                        number += source[index++];
                        while (index < length) {
                            ch = source[index];
                            if (!isHexDigit(ch)) {
                                break;
                            }
                            number += source[index++];
                        }
  
                        if (number.length <= 2) {
                            // only 0x
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
  
                        if (index < length) {
                            ch = source[index];
                            if (isIdentifierStart(ch)) {
                                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                            }
                        }
                        return {
                            type: Token.NumericLiteral,
                            value: parseInt(number, 16),
                            lineNumber: lineNumber,
                            lineStart: lineStart,
                            range: [start, index]
                        };
                    } else if (isOctalDigit(ch)) {
                        number += source[index++];
                        while (index < length) {
                            ch = source[index];
                            if (!isOctalDigit(ch)) {
                                break;
                            }
                            number += source[index++];
                        }
  
                        if (index < length) {
                            ch = source[index];
                            if (isIdentifierStart(ch) || isDecimalDigit(ch)) {
                                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                            }
                        }
                        return {
                            type: Token.NumericLiteral,
                            value: parseInt(number, 8),
                            octal: true,
                            lineNumber: lineNumber,
                            lineStart: lineStart,
                            range: [start, index]
                        };
                    }
  
                    // decimal number starts with '0' such as '09' is illegal.
                    if (isDecimalDigit(ch)) {
                        throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                    }
                }
  
                while (index < length) {
                    ch = source[index];
                    if (!isDecimalDigit(ch)) {
                        break;
                    }
                    number += source[index++];
                }
            }
  
            if (ch === '.') {
                number += source[index++];
                while (index < length) {
                    ch = source[index];
                    if (!isDecimalDigit(ch)) {
                        break;
                    }
                    number += source[index++];
                }
            }
  
            if (ch === 'e' || ch === 'E') {
                number += source[index++];
  
                ch = source[index];
                if (ch === '+' || ch === '-') {
                    number += source[index++];
                }
  
                ch = source[index];
                if (isDecimalDigit(ch)) {
                    number += source[index++];
                    while (index < length) {
                        ch = source[index];
                        if (!isDecimalDigit(ch)) {
                            break;
                        }
                        number += source[index++];
                    }
                } else {
                    ch = 'character ' + ch;
                    if (index >= length) {
                        ch = '<end>';
                    }
                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                }
            }
  
            if (index < length) {
                ch = source[index];
                if (isIdentifierStart(ch)) {
                    throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                }
            }
  
            return {
                type: Token.NumericLiteral,
                value: parseFloat(number),
                lineNumber: lineNumber,
                lineStart: lineStart,
                range: [start, index]
            };
        }
  
        // 7.8.4 String Literals
  
        function scanStringLiteral() {
            var str = '', quote, start, ch, code, unescaped, restore, octal = false;
  
            quote = source[index];
            assert((quote === '\'' || quote === '"'),
                'String literal must starts with a quote');
  
            start = index;
            ++index;
  
            while (index < length) {
                ch = source[index++];
  
                if (ch === quote) {
                    quote = '';
                    break;
                } else if (ch === '\\') {
                    ch = source[index++];
                    if (!isLineTerminator(ch)) {
                        switch (ch) {
                        case 'n':
                            str += '\n';
                            break;
                        case 'r':
                            str += '\r';
                            break;
                        case 't':
                            str += '\t';
                            break;
                        case 'u':
                        case 'x':
                            restore = index;
                            unescaped = scanHexEscape(ch);
                            if (unescaped) {
                                str += unescaped;
                            } else {
                                index = restore;
                                str += ch;
                            }
                            break;
                        case 'b':
                            str += '\b';
                            break;
                        case 'f':
                            str += '\f';
                            break;
                        case 'v':
                            str += '\x0B';
                            break;
  
                        default:
                            if (isOctalDigit(ch)) {
                                code = '01234567'.indexOf(ch);
  
                                // \0 is not octal escape sequence
                                if (code !== 0) {
                                    octal = true;
                                }
  
                                if (index < length && isOctalDigit(source[index])) {
                                    octal = true;
                                    code = code * 8 + '01234567'.indexOf(source[index++]);
  
                                    // 3 digits are only allowed when string starts
                                    // with 0, 1, 2, 3
                                    if ('0123'.indexOf(ch) >= 0 &&
                                            index < length &&
                                            isOctalDigit(source[index])) {
                                        code = code * 8 + '01234567'.indexOf(source[index++]);
                                    }
                                }
                                str += String.fromCharCode(code);
                            } else {
                                str += ch;
                            }
                            break;
                        }
                    } else {
                        ++lineNumber;
                        if (ch ===  '\r' && source[index] === '\n') {
                            ++index;
                        }
                    }
                } else if (isLineTerminator(ch)) {
                    break;
                } else {
                    str += ch;
                }
            }
  
            if (quote !== '') {
                throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
            }
  
            return {
                type: Token.StringLiteral,
                value: str,
                octal: octal,
                lineNumber: lineNumber,
                lineStart: lineStart,
                range: [start, index]
            };
        }
  
        function scanRegExp() {
            var str, ch, start, pattern, flags, value, classMarker = false, restore, terminated = false;
  
            buffer = null;
            skipComment();
  
            start = index;
            ch = source[index];
            assert(ch === '/', 'Regular expression literal must start with a slash');
            str = source[index++];
  
            while (index < length) {
                ch = source[index++];
                str += ch;
                if (ch === '\\') {
                    ch = source[index++];
                    // ECMA-262 7.8.5
                    if (isLineTerminator(ch)) {
                        throwError({}, Messages.UnterminatedRegExp);
                    }
                    str += ch;
                } else if (classMarker) {
                    if (ch === ']') {
                        classMarker = false;
                    }
                } else {
                    if (ch === '/') {
                        terminated = true;
                        break;
                    } else if (ch === '[') {
                        classMarker = true;
                    } else if (isLineTerminator(ch)) {
                        throwError({}, Messages.UnterminatedRegExp);
                    }
                }
            }
  
            if (!terminated) {
                throwError({}, Messages.UnterminatedRegExp);
            }
  
            // Exclude leading and trailing slash.
            pattern = str.substr(1, str.length - 2);
  
            flags = '';
            while (index < length) {
                ch = source[index];
                if (!isIdentifierPart(ch)) {
                    break;
                }
  
                ++index;
                if (ch === '\\' && index < length) {
                    ch = source[index];
                    if (ch === 'u') {
                        ++index;
                        restore = index;
                        ch = scanHexEscape('u');
                        if (ch) {
                            flags += ch;
                            str += '\\u';
                            for (; restore < index; ++restore) {
                                str += source[restore];
                            }
                        } else {
                            index = restore;
                            flags += 'u';
                            str += '\\u';
                        }
                    } else {
                        str += '\\';
                    }
                } else {
                    flags += ch;
                    str += ch;
                }
            }
  
            try {
                value = new RegExp(pattern, flags);
            } catch (e) {
                throwError({}, Messages.InvalidRegExp);
            }
  
            return {
                literal: str,
                value: value,
                range: [start, index]
            };
        }
  
        function isIdentifierName(token) {
            return token.type === Token.Identifier ||
                token.type === Token.Keyword ||
                token.type === Token.BooleanLiteral ||
                token.type === Token.NullLiteral;
        }
  
        function advance() {
            var ch, token;
  
            skipComment();
  
            if (index >= length) {
                return {
                    type: Token.EOF,
                    lineNumber: lineNumber,
                    lineStart: lineStart,
                    range: [index, index]
                };
            }
  
            token = scanPunctuator();
            if (typeof token !== 'undefined') {
                return token;
            }
  
            ch = source[index];
  
            if (ch === '\'' || ch === '"') {
                return scanStringLiteral();
            }
  
            if (ch === '.' || isDecimalDigit(ch)) {
                return scanNumericLiteral();
            }
  
            token = scanIdentifier();
            if (typeof token !== 'undefined') {
                return token;
            }
  
            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
        }
  
        function lex() {
            var token;
  
            if (buffer) {
                index = buffer.range[1];
                lineNumber = buffer.lineNumber;
                lineStart = buffer.lineStart;
                token = buffer;
                buffer = null;
                return token;
            }
  
            buffer = null;
            return advance();
        }
  
        function lookahead() {
            var pos, line, start;
  
            if (buffer !== null) {
                return buffer;
            }
  
            pos = index;
            line = lineNumber;
            start = lineStart;
            buffer = advance();
            index = pos;
            lineNumber = line;
            lineStart = start;
  
            return buffer;
        }
  
        // Return true if there is a line terminator before the next token.
  
        function peekLineTerminator() {
            var pos, line, start, found;
  
            pos = index;
            line = lineNumber;
            start = lineStart;
            skipComment();
            found = lineNumber !== line;
            index = pos;
            lineNumber = line;
            lineStart = start;
  
            return found;
        }
  
        // Throw an exception
  
        function throwError(token, messageFormat) {
            var error,
                args = Array.prototype.slice.call(arguments, 2),
                msg = messageFormat.replace(
                    /%(\d)/g,
                    function (whole, index) {
                        return args[index] || '';
                    }
                );
  
            if (typeof token.lineNumber === 'number') {
                error = new Error('Line ' + token.lineNumber + ': ' + msg);
                error.index = token.range[0];
                error.lineNumber = token.lineNumber;
                error.column = token.range[0] - lineStart + 1;
            } else {
                error = new Error('Line ' + lineNumber + ': ' + msg);
                error.index = index;
                error.lineNumber = lineNumber;
                error.column = index - lineStart + 1;
            }
  
            throw error;
        }
  
        function throwErrorTolerant() {
            try {
                throwError.apply(null, arguments);
            } catch (e) {
                if (extra.errors) {
                    extra.errors.push(e);
                } else {
                    throw e;
                }
            }
        }
  
  
        // Throw an exception because of the token.
  
        function throwUnexpected(token) {
            if (token.type === Token.EOF) {
                throwError(token, Messages.UnexpectedEOS);
            }
  
            if (token.type === Token.NumericLiteral) {
                throwError(token, Messages.UnexpectedNumber);
            }
  
            if (token.type === Token.StringLiteral) {
                throwError(token, Messages.UnexpectedString);
            }
  
            if (token.type === Token.Identifier) {
                throwError(token, Messages.UnexpectedIdentifier);
            }
  
            if (token.type === Token.Keyword) {
                if (isFutureReservedWord(token.value)) {
                    throwError(token, Messages.UnexpectedReserved);
                } else if (strict && isStrictModeReservedWord(token.value)) {
                    throwErrorTolerant(token, Messages.StrictReservedWord);
                    return;
                }
                throwError(token, Messages.UnexpectedToken, token.value);
            }
  
            // BooleanLiteral, NullLiteral, or Punctuator.
            throwError(token, Messages.UnexpectedToken, token.value);
        }
  
        // Expect the next token to match the specified punctuator.
        // If not, an exception will be thrown.
  
        function expect(value) {
            var token = lex();
            if (token.type !== Token.Punctuator || token.value !== value) {
                throwUnexpected(token);
            }
        }
  
        // Expect the next token to match the specified keyword.
        // If not, an exception will be thrown.
  
        function expectKeyword(keyword) {
            var token = lex();
            if (token.type !== Token.Keyword || token.value !== keyword) {
                throwUnexpected(token);
            }
        }
  
        // Return true if the next token matches the specified punctuator.
  
        function match(value) {
            var token = lookahead();
            return token.type === Token.Punctuator && token.value === value;
        }
  
        // Return true if the next token matches the specified keyword
  
        function matchKeyword(keyword) {
            var token = lookahead();
            return token.type === Token.Keyword && token.value === keyword;
        }
  
        // Return true if the next token is an assignment operator
  
        function matchAssign() {
            var token = lookahead(),
                op = token.value;
  
            if (token.type !== Token.Punctuator) {
                return false;
            }
            return op === '=' ||
                op === '*=' ||
                op === '/=' ||
                op === '%=' ||
                op === '+=' ||
                op === '-=' ||
                op === '<<=' ||
                op === '>>=' ||
                op === '>>>=' ||
                op === '&=' ||
                op === '^=' ||
                op === '|=';
        }
  
        function consumeSemicolon() {
            var token, line;
  
            // Catch the very common case first.
            if (source[index] === ';') {
                lex();
                return;
            }
  
            line = lineNumber;
            skipComment();
            if (lineNumber !== line) {
                return;
            }
  
            if (match(';')) {
                lex();
                return;
            }
  
            token = lookahead();
            if (token.type !== Token.EOF && !match('}')) {
                throwUnexpected(token);
            }
        }
  
        // Return true if provided expression is LeftHandSideExpression
  
        function isLeftHandSide(expr) {
            return expr.type === Syntax.Identifier || expr.type === Syntax.MemberExpression;
        }
  
        // 11.1.4 Array Initialiser
  
        function parseArrayInitialiser() {
            var elements = [];
  
            expect('[');
  
            while (!match(']')) {
                if (match(',')) {
                    lex();
                    elements.push(null);
                } else {
                    elements.push(parseAssignmentExpression());
  
                    if (!match(']')) {
                        expect(',');
                    }
                }
            }
  
            expect(']');
  
            return {
                type: Syntax.ArrayExpression,
                elements: elements
            };
        }
  
        // 11.1.5 Object Initialiser
  
        function parsePropertyFunction(param, first) {
            var previousStrict, body;
  
            previousStrict = strict;
            body = parseFunctionSourceElements();
            if (first && strict && isRestrictedWord(param[0].name)) {
                throwErrorTolerant(first, Messages.StrictParamName);
            }
            strict = previousStrict;
  
            return {
                type: Syntax.FunctionExpression,
                id: null,
                params: param,
                defaults: [],
                body: body,
                rest: null,
                generator: false,
                expression: false
            };
        }
  
        function parseObjectPropertyKey() {
            var token = lex();
  
            // Note: This function is called only from parseObjectProperty(), where
            // EOF and Punctuator tokens are already filtered out.
  
            if (token.type === Token.StringLiteral || token.type === Token.NumericLiteral) {
                if (strict && token.octal) {
                    throwErrorTolerant(token, Messages.StrictOctalLiteral);
                }
                return createLiteral(token);
            }
  
            return {
                type: Syntax.Identifier,
                name: token.value
            };
        }
  
        function parseObjectProperty() {
            var token, key, id, param;
  
            token = lookahead();
  
            if (token.type === Token.Identifier) {
  
                id = parseObjectPropertyKey();
  
                // Property Assignment: Getter and Setter.
  
                if (token.value === 'get' && !match(':')) {
                    key = parseObjectPropertyKey();
                    expect('(');
                    expect(')');
                    return {
                        type: Syntax.Property,
                        key: key,
                        value: parsePropertyFunction([]),
                        kind: 'get'
                    };
                } else if (token.value === 'set' && !match(':')) {
                    key = parseObjectPropertyKey();
                    expect('(');
                    token = lookahead();
                    if (token.type !== Token.Identifier) {
                        expect(')');
                        throwErrorTolerant(token, Messages.UnexpectedToken, token.value);
                        return {
                            type: Syntax.Property,
                            key: key,
                            value: parsePropertyFunction([]),
                            kind: 'set'
                        };
                    } else {
                        param = [ parseVariableIdentifier() ];
                        expect(')');
                        return {
                            type: Syntax.Property,
                            key: key,
                            value: parsePropertyFunction(param, token),
                            kind: 'set'
                        };
                    }
                } else {
                    expect(':');
                    return {
                        type: Syntax.Property,
                        key: id,
                        value: parseAssignmentExpression(),
                        kind: 'init'
                    };
                }
            } else if (token.type === Token.EOF || token.type === Token.Punctuator) {
                throwUnexpected(token);
            } else {
                key = parseObjectPropertyKey();
                expect(':');
                return {
                    type: Syntax.Property,
                    key: key,
                    value: parseAssignmentExpression(),
                    kind: 'init'
                };
            }
        }
  
        function parseObjectInitialiser() {
            var properties = [], property, name, kind, map = {}, toString = String;
  
            expect('{');
  
            while (!match('}')) {
                property = parseObjectProperty();
  
                if (property.key.type === Syntax.Identifier) {
                    name = property.key.name;
                } else {
                    name = toString(property.key.value);
                }
                kind = (property.kind === 'init') ? PropertyKind.Data : (property.kind === 'get') ? PropertyKind.Get : PropertyKind.Set;
                if (Object.prototype.hasOwnProperty.call(map, name)) {
                    if (map[name] === PropertyKind.Data) {
                        if (strict && kind === PropertyKind.Data) {
                            throwErrorTolerant({}, Messages.StrictDuplicateProperty);
                        } else if (kind !== PropertyKind.Data) {
                            throwErrorTolerant({}, Messages.AccessorDataProperty);
                        }
                    } else {
                        if (kind === PropertyKind.Data) {
                            throwErrorTolerant({}, Messages.AccessorDataProperty);
                        } else if (map[name] & kind) {
                            throwErrorTolerant({}, Messages.AccessorGetSet);
                        }
                    }
                    map[name] |= kind;
                } else {
                    map[name] = kind;
                }
  
                properties.push(property);
  
                if (!match('}')) {
                    expect(',');
                }
            }
  
            expect('}');
  
            return {
                type: Syntax.ObjectExpression,
                properties: properties
            };
        }
  
        // 11.1.6 The Grouping Operator
  
        function parseGroupExpression() {
            var expr;
  
            expect('(');
  
            expr = parseExpression();
  
            expect(')');
  
            return expr;
        }
  
  
        // 11.1 Primary Expressions
  
        function parsePrimaryExpression() {
            var token = lookahead(),
                type = token.type;
  
            if (type === Token.Identifier) {
                return {
                    type: Syntax.Identifier,
                    name: lex().value
                };
            }
  
            if (type === Token.StringLiteral || type === Token.NumericLiteral) {
                if (strict && token.octal) {
                    throwErrorTolerant(token, Messages.StrictOctalLiteral);
                }
                return createLiteral(lex());
            }
  
            if (type === Token.Keyword) {
                if (matchKeyword('this')) {
                    lex();
                    return {
                        type: Syntax.ThisExpression
                    };
                }
  
                if (matchKeyword('function')) {
                    return parseFunctionExpression();
                }
            }
  
            if (type === Token.BooleanLiteral) {
                lex();
                token.value = (token.value === 'true');
                return createLiteral(token);
            }
  
            if (type === Token.NullLiteral) {
                lex();
                token.value = null;
                return createLiteral(token);
            }
  
            if (match('[')) {
                return parseArrayInitialiser();
            }
  
            if (match('{')) {
                return parseObjectInitialiser();
            }
  
            if (match('(')) {
                return parseGroupExpression();
            }
  
            if (match('/') || match('/=')) {
                return createLiteral(scanRegExp());
            }
  
            return throwUnexpected(lex());
        }
  
        // 11.2 Left-Hand-Side Expressions
  
        function parseArguments() {
            var args = [];
  
            expect('(');
  
            if (!match(')')) {
                while (index < length) {
                    args.push(parseAssignmentExpression());
                    if (match(')')) {
                        break;
                    }
                    expect(',');
                }
            }
  
            expect(')');
  
            return args;
        }
  
        function parseNonComputedProperty() {
            var token = lex();
  
            if (!isIdentifierName(token)) {
                throwUnexpected(token);
            }
  
            return {
                type: Syntax.Identifier,
                name: token.value
            };
        }
  
        function parseNonComputedMember() {
            expect('.');
  
            return parseNonComputedProperty();
        }
  
        function parseComputedMember() {
            var expr;
  
            expect('[');
  
            expr = parseExpression();
  
            expect(']');
  
            return expr;
        }
  
        function parseNewExpression() {
            var expr;
  
            expectKeyword('new');
  
            expr = {
                type: Syntax.NewExpression,
                callee: parseLeftHandSideExpression(),
                'arguments': []
            };
  
            if (match('(')) {
                expr['arguments'] = parseArguments();
            }
  
            return expr;
        }
  
        function parseLeftHandSideExpressionAllowCall() {
            var expr;
  
            expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
  
            while (match('.') || match('[') || match('(')) {
                if (match('(')) {
                    expr = {
                        type: Syntax.CallExpression,
                        callee: expr,
                        'arguments': parseArguments()
                    };
                } else if (match('[')) {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: true,
                        object: expr,
                        property: parseComputedMember()
                    };
                } else {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: false,
                        object: expr,
                        property: parseNonComputedMember()
                    };
                }
            }
  
            return expr;
        }
  
  
        function parseLeftHandSideExpression() {
            var expr;
  
            expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
  
            while (match('.') || match('[')) {
                if (match('[')) {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: true,
                        object: expr,
                        property: parseComputedMember()
                    };
                } else {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: false,
                        object: expr,
                        property: parseNonComputedMember()
                    };
                }
            }
  
            return expr;
        }
  
        // 11.3 Postfix Expressions
  
        function parsePostfixExpression() {
            var expr = parseLeftHandSideExpressionAllowCall(), token;
  
            token = lookahead();
            if (token.type !== Token.Punctuator) {
                return expr;
            }
  
            if ((match('++') || match('--')) && !peekLineTerminator()) {
                // 11.3.1, 11.3.2
                if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
                    throwErrorTolerant({}, Messages.StrictLHSPostfix);
                }
                if (!isLeftHandSide(expr)) {
                    throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
                }
  
                expr = {
                    type: Syntax.UpdateExpression,
                    operator: lex().value,
                    argument: expr,
                    prefix: false
                };
            }
  
            return expr;
        }
  
        // 11.4 Unary Operators
  
        function parseUnaryExpression() {
            var token, expr;
  
            token = lookahead();
            if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
                return parsePostfixExpression();
            }
  
            if (match('++') || match('--')) {
                token = lex();
                expr = parseUnaryExpression();
                // 11.4.4, 11.4.5
                if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
                    throwErrorTolerant({}, Messages.StrictLHSPrefix);
                }
  
                if (!isLeftHandSide(expr)) {
                    throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
                }
  
                expr = {
                    type: Syntax.UpdateExpression,
                    operator: token.value,
                    argument: expr,
                    prefix: true
                };
                return expr;
            }
  
            if (match('+') || match('-') || match('~') || match('!')) {
                expr = {
                    type: Syntax.UnaryExpression,
                    operator: lex().value,
                    argument: parseUnaryExpression(),
                    prefix: true
                };
                return expr;
            }
  
            if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
                expr = {
                    type: Syntax.UnaryExpression,
                    operator: lex().value,
                    argument: parseUnaryExpression(),
                    prefix: true
                };
                if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) {
                    throwErrorTolerant({}, Messages.StrictDelete);
                }
                return expr;
            }
  
            return parsePostfixExpression();
        }
  
        // 11.5 Multiplicative Operators
  
        function parseMultiplicativeExpression() {
            var expr = parseUnaryExpression();
  
            while (match('*') || match('/') || match('%')) {
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: lex().value,
                    left: expr,
                    right: parseUnaryExpression()
                };
            }
  
            return expr;
        }
  
        // 11.6 Additive Operators
  
        function parseAdditiveExpression() {
            var expr = parseMultiplicativeExpression();
  
            while (match('+') || match('-')) {
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: lex().value,
                    left: expr,
                    right: parseMultiplicativeExpression()
                };
            }
  
            return expr;
        }
  
        // 11.7 Bitwise Shift Operators
  
        function parseShiftExpression() {
            var expr = parseAdditiveExpression();
  
            while (match('<<') || match('>>') || match('>>>')) {
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: lex().value,
                    left: expr,
                    right: parseAdditiveExpression()
                };
            }
  
            return expr;
        }
        // 11.8 Relational Operators
  
        function parseRelationalExpression() {
            var expr, previousAllowIn;
  
            previousAllowIn = state.allowIn;
            state.allowIn = true;
  
            expr = parseShiftExpression();
  
            while (match('<') || match('>') || match('<=') || match('>=') || (previousAllowIn && matchKeyword('in')) || matchKeyword('instanceof')) {
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: lex().value,
                    left: expr,
                    right: parseShiftExpression()
                };
            }
  
            state.allowIn = previousAllowIn;
            return expr;
        }
  
        // 11.9 Equality Operators
  
        function parseEqualityExpression() {
            var expr = parseRelationalExpression();
  
            while (match('==') || match('!=') || match('===') || match('!==')) {
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: lex().value,
                    left: expr,
                    right: parseRelationalExpression()
                };
            }
  
            return expr;
        }
  
        // 11.10 Binary Bitwise Operators
  
        function parseBitwiseANDExpression() {
            var expr = parseEqualityExpression();
  
            while (match('&')) {
                lex();
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: '&',
                    left: expr,
                    right: parseEqualityExpression()
                };
            }
  
            return expr;
        }
  
        function parseBitwiseXORExpression() {
            var expr = parseBitwiseANDExpression();
  
            while (match('^')) {
                lex();
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: '^',
                    left: expr,
                    right: parseBitwiseANDExpression()
                };
            }
  
            return expr;
        }
  
        function parseBitwiseORExpression() {
            var expr = parseBitwiseXORExpression();
  
            while (match('|')) {
                lex();
                expr = {
                    type: Syntax.BinaryExpression,
                    operator: '|',
                    left: expr,
                    right: parseBitwiseXORExpression()
                };
            }
  
            return expr;
        }
  
        // 11.11 Binary Logical Operators
  
        function parseLogicalANDExpression() {
            var expr = parseBitwiseORExpression();
  
            while (match('&&')) {
                lex();
                expr = {
                    type: Syntax.LogicalExpression,
                    operator: '&&',
                    left: expr,
                    right: parseBitwiseORExpression()
                };
            }
  
            return expr;
        }
  
        function parseLogicalORExpression() {
            var expr = parseLogicalANDExpression();
  
            while (match('||')) {
                lex();
                expr = {
                    type: Syntax.LogicalExpression,
                    operator: '||',
                    left: expr,
                    right: parseLogicalANDExpression()
                };
            }
  
            return expr;
        }
  
        // 11.12 Conditional Operator
  
        function parseConditionalExpression() {
            var expr, previousAllowIn, consequent;
  
            expr = parseLogicalORExpression();
  
            if (match('?')) {
                lex();
                previousAllowIn = state.allowIn;
                state.allowIn = true;
                consequent = parseAssignmentExpression();
                state.allowIn = previousAllowIn;
                expect(':');
  
                expr = {
                    type: Syntax.ConditionalExpression,
                    test: expr,
                    consequent: consequent,
                    alternate: parseAssignmentExpression()
                };
            }
  
            return expr;
        }
  
        // 11.13 Assignment Operators
  
        function parseAssignmentExpression() {
            var token, expr;
  
            token = lookahead();
            expr = parseConditionalExpression();
  
            if (matchAssign()) {
                // LeftHandSideExpression
                if (!isLeftHandSide(expr)) {
                    throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
                }
  
                // 11.13.1
                if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
                    throwErrorTolerant(token, Messages.StrictLHSAssignment);
                }
  
                expr = {
                    type: Syntax.AssignmentExpression,
                    operator: lex().value,
                    left: expr,
                    right: parseAssignmentExpression()
                };
            }
  
            return expr;
        }
  
        // 11.14 Comma Operator
  
        function parseExpression() {
            var expr = parseAssignmentExpression();
  
            if (match(',')) {
                expr = {
                    type: Syntax.SequenceExpression,
                    expressions: [ expr ]
                };
  
                while (index < length) {
                    if (!match(',')) {
                        break;
                    }
                    lex();
                    expr.expressions.push(parseAssignmentExpression());
                }
  
            }
            return expr;
        }
  
        // 12.1 Block
  
        function parseStatementList() {
            var list = [],
                statement;
  
            while (index < length) {
                if (match('}')) {
                    break;
                }
                statement = parseSourceElement();
                if (typeof statement === 'undefined') {
                    break;
                }
                list.push(statement);
            }
  
            return list;
        }
  
        function parseBlock() {
            var block;
  
            expect('{');
  
            block = parseStatementList();
  
            expect('}');
  
            return {
                type: Syntax.BlockStatement,
                body: block
            };
        }
  
        // 12.2 Variable Statement
  
        function parseVariableIdentifier() {
            var token = lex();
  
            if (token.type !== Token.Identifier) {
                throwUnexpected(token);
            }
  
            return {
                type: Syntax.Identifier,
                name: token.value
            };
        }
  
        function parseVariableDeclaration(kind) {
            var id = parseVariableIdentifier(),
                init = null;
  
            // 12.2.1
            if (strict && isRestrictedWord(id.name)) {
                throwErrorTolerant({}, Messages.StrictVarName);
            }
  
            if (kind === 'const') {
                expect('=');
                init = parseAssignmentExpression();
            } else if (match('=')) {
                lex();
                init = parseAssignmentExpression();
            }
  
            return {
                type: Syntax.VariableDeclarator,
                id: id,
                init: init
            };
        }
  
        function parseVariableDeclarationList(kind) {
            var list = [];
  
            do {
                list.push(parseVariableDeclaration(kind));
                if (!match(',')) {
                    break;
                }
                lex();
            } while (index < length);
  
            return list;
        }
  
        function parseVariableStatement() {
            var declarations;
  
            expectKeyword('var');
  
            declarations = parseVariableDeclarationList();
  
            consumeSemicolon();
  
            return {
                type: Syntax.VariableDeclaration,
                declarations: declarations,
                kind: 'var'
            };
        }
  
        // kind may be `const` or `let`
        // Both are experimental and not in the specification yet.
        // see http://wiki.ecmascript.org/doku.php?id=harmony:const
        // and http://wiki.ecmascript.org/doku.php?id=harmony:let
        function parseConstLetDeclaration(kind) {
            var declarations;
  
            expectKeyword(kind);
  
            declarations = parseVariableDeclarationList(kind);
  
            consumeSemicolon();
  
            return {
                type: Syntax.VariableDeclaration,
                declarations: declarations,
                kind: kind
            };
        }
  
        // 12.3 Empty Statement
  
        function parseEmptyStatement() {
            expect(';');
  
            return {
                type: Syntax.EmptyStatement
            };
        }
  
        // 12.4 Expression Statement
  
        function parseExpressionStatement() {
            var expr = parseExpression();
  
            consumeSemicolon();
  
            return {
                type: Syntax.ExpressionStatement,
                expression: expr
            };
        }
  
        // 12.5 If statement
  
        function parseIfStatement() {
            var test, consequent, alternate;
  
            expectKeyword('if');
  
            expect('(');
  
            test = parseExpression();
  
            expect(')');
  
            consequent = parseStatement();
  
            if (matchKeyword('else')) {
                lex();
                alternate = parseStatement();
            } else {
                alternate = null;
            }
  
            return {
                type: Syntax.IfStatement,
                test: test,
                consequent: consequent,
                alternate: alternate
            };
        }
  
        // 12.6 Iteration Statements
  
        function parseDoWhileStatement() {
            var body, test, oldInIteration;
  
            expectKeyword('do');
  
            oldInIteration = state.inIteration;
            state.inIteration = true;
  
            body = parseStatement();
  
            state.inIteration = oldInIteration;
  
            expectKeyword('while');
  
            expect('(');
  
            test = parseExpression();
  
            expect(')');
  
            if (match(';')) {
                lex();
            }
  
            return {
                type: Syntax.DoWhileStatement,
                body: body,
                test: test
            };
        }
  
        function parseWhileStatement() {
            var test, body, oldInIteration;
  
            expectKeyword('while');
  
            expect('(');
  
            test = parseExpression();
  
            expect(')');
  
            oldInIteration = state.inIteration;
            state.inIteration = true;
  
            body = parseStatement();
  
            state.inIteration = oldInIteration;
  
            return {
                type: Syntax.WhileStatement,
                test: test,
                body: body
            };
        }
  
        function parseForVariableDeclaration() {
            var token = lex();
  
            return {
                type: Syntax.VariableDeclaration,
                declarations: parseVariableDeclarationList(),
                kind: token.value
            };
        }
  
        function parseForStatement() {
            var init, test, update, left, right, body, oldInIteration;
  
            init = test = update = null;
  
            expectKeyword('for');
  
            expect('(');
  
            if (match(';')) {
                lex();
            } else {
                if (matchKeyword('var') || matchKeyword('let')) {
                    state.allowIn = false;
                    init = parseForVariableDeclaration();
                    state.allowIn = true;
  
                    if (init.declarations.length === 1 && matchKeyword('in')) {
                        lex();
                        left = init;
                        right = parseExpression();
                        init = null;
                    }
                } else {
                    state.allowIn = false;
                    init = parseExpression();
                    state.allowIn = true;
  
                    if (matchKeyword('in')) {
                        // LeftHandSideExpression
                        if (!isLeftHandSide(init)) {
                            throwErrorTolerant({}, Messages.InvalidLHSInForIn);
                        }
  
                        lex();
                        left = init;
                        right = parseExpression();
                        init = null;
                    }
                }
  
                if (typeof left === 'undefined') {
                    expect(';');
                }
            }
  
            if (typeof left === 'undefined') {
  
                if (!match(';')) {
                    test = parseExpression();
                }
                expect(';');
  
                if (!match(')')) {
                    update = parseExpression();
                }
            }
  
            expect(')');
  
            oldInIteration = state.inIteration;
            state.inIteration = true;
  
            body = parseStatement();
  
            state.inIteration = oldInIteration;
  
            if (typeof left === 'undefined') {
                return {
                    type: Syntax.ForStatement,
                    init: init,
                    test: test,
                    update: update,
                    body: body
                };
            }
  
            return {
                type: Syntax.ForInStatement,
                left: left,
                right: right,
                body: body,
                each: false
            };
        }
  
        // 12.7 The continue statement
  
        function parseContinueStatement() {
            var token, label = null;
  
            expectKeyword('continue');
  
            // Optimize the most common form: 'continue;'.
            if (source[index] === ';') {
                lex();
  
                if (!state.inIteration) {
                    throwError({}, Messages.IllegalContinue);
                }
  
                return {
                    type: Syntax.ContinueStatement,
                    label: null
                };
            }
  
            if (peekLineTerminator()) {
                if (!state.inIteration) {
                    throwError({}, Messages.IllegalContinue);
                }
  
                return {
                    type: Syntax.ContinueStatement,
                    label: null
                };
            }
  
            token = lookahead();
            if (token.type === Token.Identifier) {
                label = parseVariableIdentifier();
  
                if (!Object.prototype.hasOwnProperty.call(state.labelSet, label.name)) {
                    throwError({}, Messages.UnknownLabel, label.name);
                }
            }
  
            consumeSemicolon();
  
            if (label === null && !state.inIteration) {
                throwError({}, Messages.IllegalContinue);
            }
  
            return {
                type: Syntax.ContinueStatement,
                label: label
            };
        }
  
        // 12.8 The break statement
  
        function parseBreakStatement() {
            var token, label = null;
  
            expectKeyword('break');
  
            // Optimize the most common form: 'break;'.
            if (source[index] === ';') {
                lex();
  
                if (!(state.inIteration || state.inSwitch)) {
                    throwError({}, Messages.IllegalBreak);
                }
  
                return {
                    type: Syntax.BreakStatement,
                    label: null
                };
            }
  
            if (peekLineTerminator()) {
                if (!(state.inIteration || state.inSwitch)) {
                    throwError({}, Messages.IllegalBreak);
                }
  
                return {
                    type: Syntax.BreakStatement,
                    label: null
                };
            }
  
            token = lookahead();
            if (token.type === Token.Identifier) {
                label = parseVariableIdentifier();
  
                if (!Object.prototype.hasOwnProperty.call(state.labelSet, label.name)) {
                    throwError({}, Messages.UnknownLabel, label.name);
                }
            }
  
            consumeSemicolon();
  
            if (label === null && !(state.inIteration || state.inSwitch)) {
                throwError({}, Messages.IllegalBreak);
            }
  
            return {
                type: Syntax.BreakStatement,
                label: label
            };
        }
  
        // 12.9 The return statement
  
        function parseReturnStatement() {
            var token, argument = null;
  
            expectKeyword('return');
  
            if (!state.inFunctionBody) {
                throwErrorTolerant({}, Messages.IllegalReturn);
            }
  
            // 'return' followed by a space and an identifier is very common.
            if (source[index] === ' ') {
                if (isIdentifierStart(source[index + 1])) {
                    argument = parseExpression();
                    consumeSemicolon();
                    return {
                        type: Syntax.ReturnStatement,
                        argument: argument
                    };
                }
            }
  
            if (peekLineTerminator()) {
                return {
                    type: Syntax.ReturnStatement,
                    argument: null
                };
            }
  
            if (!match(';')) {
                token = lookahead();
                if (!match('}') && token.type !== Token.EOF) {
                    argument = parseExpression();
                }
            }
  
            consumeSemicolon();
  
            return {
                type: Syntax.ReturnStatement,
                argument: argument
            };
        }
  
        // 12.10 The with statement
  
        function parseWithStatement() {
            var object, body;
  
            if (strict) {
                throwErrorTolerant({}, Messages.StrictModeWith);
            }
  
            expectKeyword('with');
  
            expect('(');
  
            object = parseExpression();
  
            expect(')');
  
            body = parseStatement();
  
            return {
                type: Syntax.WithStatement,
                object: object,
                body: body
            };
        }
  
        // 12.10 The swith statement
  
        function parseSwitchCase() {
            var test,
                consequent = [],
                statement;
  
            if (matchKeyword('default')) {
                lex();
                test = null;
            } else {
                expectKeyword('case');
                test = parseExpression();
            }
            expect(':');
  
            while (index < length) {
                if (match('}') || matchKeyword('default') || matchKeyword('case')) {
                    break;
                }
                statement = parseStatement();
                if (typeof statement === 'undefined') {
                    break;
                }
                consequent.push(statement);
            }
  
            return {
                type: Syntax.SwitchCase,
                test: test,
                consequent: consequent
            };
        }
  
        function parseSwitchStatement() {
            var discriminant, cases, clause, oldInSwitch, defaultFound;
  
            expectKeyword('switch');
  
            expect('(');
  
            discriminant = parseExpression();
  
            expect(')');
  
            expect('{');
  
            cases = [];
  
            if (match('}')) {
                lex();
                return {
                    type: Syntax.SwitchStatement,
                    discriminant: discriminant,
                    cases: cases
                };
            }
  
            oldInSwitch = state.inSwitch;
            state.inSwitch = true;
            defaultFound = false;
  
            while (index < length) {
                if (match('}')) {
                    break;
                }
                clause = parseSwitchCase();
                if (clause.test === null) {
                    if (defaultFound) {
                        throwError({}, Messages.MultipleDefaultsInSwitch);
                    }
                    defaultFound = true;
                }
                cases.push(clause);
            }
  
            state.inSwitch = oldInSwitch;
  
            expect('}');
  
            return {
                type: Syntax.SwitchStatement,
                discriminant: discriminant,
                cases: cases
            };
        }
  
        // 12.13 The throw statement
  
        function parseThrowStatement() {
            var argument;
  
            expectKeyword('throw');
  
            if (peekLineTerminator()) {
                throwError({}, Messages.NewlineAfterThrow);
            }
  
            argument = parseExpression();
  
            consumeSemicolon();
  
            return {
                type: Syntax.ThrowStatement,
                argument: argument
            };
        }
  
        // 12.14 The try statement
  
        function parseCatchClause() {
            var param;
  
            expectKeyword('catch');
  
            expect('(');
            if (match(')')) {
                throwUnexpected(lookahead());
            }
  
            param = parseVariableIdentifier();
            // 12.14.1
            if (strict && isRestrictedWord(param.name)) {
                throwErrorTolerant({}, Messages.StrictCatchVariable);
            }
  
            expect(')');
  
            return {
                type: Syntax.CatchClause,
                param: param,
                body: parseBlock()
            };
        }
  
        function parseTryStatement() {
            var block, handlers = [], finalizer = null;
  
            expectKeyword('try');
  
            block = parseBlock();
  
            if (matchKeyword('catch')) {
                handlers.push(parseCatchClause());
            }
  
            if (matchKeyword('finally')) {
                lex();
                finalizer = parseBlock();
            }
  
            if (handlers.length === 0 && !finalizer) {
                throwError({}, Messages.NoCatchOrFinally);
            }
  
            return {
                type: Syntax.TryStatement,
                block: block,
                guardedHandlers: [],
                handlers: handlers,
                finalizer: finalizer
            };
        }
  
        // 12.15 The debugger statement
  
        function parseDebuggerStatement() {
            expectKeyword('debugger');
  
            consumeSemicolon();
  
            return {
                type: Syntax.DebuggerStatement
            };
        }
  
        // 12 Statements
  
        function parseStatement() {
            var token = lookahead(),
                expr,
                labeledBody;
  
            if (token.type === Token.EOF) {
                throwUnexpected(token);
            }
  
            if (token.type === Token.Punctuator) {
                switch (token.value) {
                case ';':
                    return parseEmptyStatement();
                case '{':
                    return parseBlock();
                case '(':
                    return parseExpressionStatement();
                default:
                    break;
                }
            }
  
            if (token.type === Token.Keyword) {
                switch (token.value) {
                case 'break':
                    return parseBreakStatement();
                case 'continue':
                    return parseContinueStatement();
                case 'debugger':
                    return parseDebuggerStatement();
                case 'do':
                    return parseDoWhileStatement();
                case 'for':
                    return parseForStatement();
                case 'function':
                    return parseFunctionDeclaration();
                case 'if':
                    return parseIfStatement();
                case 'return':
                    return parseReturnStatement();
                case 'switch':
                    return parseSwitchStatement();
                case 'throw':
                    return parseThrowStatement();
                case 'try':
                    return parseTryStatement();
                case 'var':
                    return parseVariableStatement();
                case 'while':
                    return parseWhileStatement();
                case 'with':
                    return parseWithStatement();
                default:
                    break;
                }
            }
  
            expr = parseExpression();
  
            // 12.12 Labelled Statements
            if ((expr.type === Syntax.Identifier) && match(':')) {
                lex();
  
                if (Object.prototype.hasOwnProperty.call(state.labelSet, expr.name)) {
                    throwError({}, Messages.Redeclaration, 'Label', expr.name);
                }
  
                state.labelSet[expr.name] = true;
                labeledBody = parseStatement();
                delete state.labelSet[expr.name];
  
                return {
                    type: Syntax.LabeledStatement,
                    label: expr,
                    body: labeledBody
                };
            }
  
            consumeSemicolon();
  
            return {
                type: Syntax.ExpressionStatement,
                expression: expr
            };
        }
  
        // 13 Function Definition
  
        function parseFunctionSourceElements() {
            var sourceElement, sourceElements = [], token, directive, firstRestricted,
                oldLabelSet, oldInIteration, oldInSwitch, oldInFunctionBody;
  
            expect('{');
  
            while (index < length) {
                token = lookahead();
                if (token.type !== Token.StringLiteral) {
                    break;
                }
  
                sourceElement = parseSourceElement();
                sourceElements.push(sourceElement);
                if (sourceElement.expression.type !== Syntax.Literal) {
                    // this is not directive
                    break;
                }
                directive = sliceSource(token.range[0] + 1, token.range[1] - 1);
                if (directive === 'use strict') {
                    strict = true;
                    if (firstRestricted) {
                        throwErrorTolerant(firstRestricted, Messages.StrictOctalLiteral);
                    }
                } else {
                    if (!firstRestricted && token.octal) {
                        firstRestricted = token;
                    }
                }
            }
  
            oldLabelSet = state.labelSet;
            oldInIteration = state.inIteration;
            oldInSwitch = state.inSwitch;
            oldInFunctionBody = state.inFunctionBody;
  
            state.labelSet = {};
            state.inIteration = false;
            state.inSwitch = false;
            state.inFunctionBody = true;
  
            while (index < length) {
                if (match('}')) {
                    break;
                }
                sourceElement = parseSourceElement();
                if (typeof sourceElement === 'undefined') {
                    break;
                }
                sourceElements.push(sourceElement);
            }
  
            expect('}');
  
            state.labelSet = oldLabelSet;
            state.inIteration = oldInIteration;
            state.inSwitch = oldInSwitch;
            state.inFunctionBody = oldInFunctionBody;
  
            return {
                type: Syntax.BlockStatement,
                body: sourceElements
            };
        }
  
        function parseFunctionDeclaration() {
            var id, param, params = [], body, token, stricted, firstRestricted, message, previousStrict, paramSet;
  
            expectKeyword('function');
            token = lookahead();
            id = parseVariableIdentifier();
            if (strict) {
                if (isRestrictedWord(token.value)) {
                    throwErrorTolerant(token, Messages.StrictFunctionName);
                }
            } else {
                if (isRestrictedWord(token.value)) {
                    firstRestricted = token;
                    message = Messages.StrictFunctionName;
                } else if (isStrictModeReservedWord(token.value)) {
                    firstRestricted = token;
                    message = Messages.StrictReservedWord;
                }
            }
  
            expect('(');
  
            if (!match(')')) {
                paramSet = {};
                while (index < length) {
                    token = lookahead();
                    param = parseVariableIdentifier();
                    if (strict) {
                        if (isRestrictedWord(token.value)) {
                            stricted = token;
                            message = Messages.StrictParamName;
                        }
                        if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) {
                            stricted = token;
                            message = Messages.StrictParamDupe;
                        }
                    } else if (!firstRestricted) {
                        if (isRestrictedWord(token.value)) {
                            firstRestricted = token;
                            message = Messages.StrictParamName;
                        } else if (isStrictModeReservedWord(token.value)) {
                            firstRestricted = token;
                            message = Messages.StrictReservedWord;
                        } else if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) {
                            firstRestricted = token;
                            message = Messages.StrictParamDupe;
                        }
                    }
                    params.push(param);
                    paramSet[param.name] = true;
                    if (match(')')) {
                        break;
                    }
                    expect(',');
                }
            }
  
            expect(')');
  
            previousStrict = strict;
            body = parseFunctionSourceElements();
            if (strict && firstRestricted) {
                throwError(firstRestricted, message);
            }
            if (strict && stricted) {
                throwErrorTolerant(stricted, message);
            }
            strict = previousStrict;
  
            return {
                type: Syntax.FunctionDeclaration,
                id: id,
                params: params,
                defaults: [],
                body: body,
                rest: null,
                generator: false,
                expression: false
            };
        }
  
        function parseFunctionExpression() {
            var token, id = null, stricted, firstRestricted, message, param, params = [], body, previousStrict, paramSet;
  
            expectKeyword('function');
  
            if (!match('(')) {
                token = lookahead();
                id = parseVariableIdentifier();
                if (strict) {
                    if (isRestrictedWord(token.value)) {
                        throwErrorTolerant(token, Messages.StrictFunctionName);
                    }
                } else {
                    if (isRestrictedWord(token.value)) {
                        firstRestricted = token;
                        message = Messages.StrictFunctionName;
                    } else if (isStrictModeReservedWord(token.value)) {
                        firstRestricted = token;
                        message = Messages.StrictReservedWord;
                    }
                }
            }
  
            expect('(');
  
            if (!match(')')) {
                paramSet = {};
                while (index < length) {
                    token = lookahead();
                    param = parseVariableIdentifier();
                    if (strict) {
                        if (isRestrictedWord(token.value)) {
                            stricted = token;
                            message = Messages.StrictParamName;
                        }
                        if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) {
                            stricted = token;
                            message = Messages.StrictParamDupe;
                        }
                    } else if (!firstRestricted) {
                        if (isRestrictedWord(token.value)) {
                            firstRestricted = token;
                            message = Messages.StrictParamName;
                        } else if (isStrictModeReservedWord(token.value)) {
                            firstRestricted = token;
                            message = Messages.StrictReservedWord;
                        } else if (Object.prototype.hasOwnProperty.call(paramSet, token.value)) {
                            firstRestricted = token;
                            message = Messages.StrictParamDupe;
                        }
                    }
                    params.push(param);
                    paramSet[param.name] = true;
                    if (match(')')) {
                        break;
                    }
                    expect(',');
                }
            }
  
            expect(')');
  
            previousStrict = strict;
            body = parseFunctionSourceElements();
            if (strict && firstRestricted) {
                throwError(firstRestricted, message);
            }
            if (strict && stricted) {
                throwErrorTolerant(stricted, message);
            }
            strict = previousStrict;
  
            return {
                type: Syntax.FunctionExpression,
                id: id,
                params: params,
                defaults: [],
                body: body,
                rest: null,
                generator: false,
                expression: false
            };
        }
  
        // 14 Program
  
        function parseSourceElement() {
            var token = lookahead();
  
            if (token.type === Token.Keyword) {
                switch (token.value) {
                case 'const':
                case 'let':
                    return parseConstLetDeclaration(token.value);
                case 'function':
                    return parseFunctionDeclaration();
                default:
                    return parseStatement();
                }
            }
  
            if (token.type !== Token.EOF) {
                return parseStatement();
            }
        }
  
        function parseSourceElements() {
            var sourceElement, sourceElements = [], token, directive, firstRestricted;
  
            while (index < length) {
                token = lookahead();
                if (token.type !== Token.StringLiteral) {
                    break;
                }
  
                sourceElement = parseSourceElement();
                sourceElements.push(sourceElement);
                if (sourceElement.expression.type !== Syntax.Literal) {
                    // this is not directive
                    break;
                }
                directive = sliceSource(token.range[0] + 1, token.range[1] - 1);
                if (directive === 'use strict') {
                    strict = true;
                    if (firstRestricted) {
                        throwErrorTolerant(firstRestricted, Messages.StrictOctalLiteral);
                    }
                } else {
                    if (!firstRestricted && token.octal) {
                        firstRestricted = token;
                    }
                }
            }
  
            while (index < length) {
                sourceElement = parseSourceElement();
                if (typeof sourceElement === 'undefined') {
                    break;
                }
                sourceElements.push(sourceElement);
            }
            return sourceElements;
        }
  
        function parseProgram() {
            var program;
            strict = false;
            program = {
                type: Syntax.Program,
                body: parseSourceElements()
            };
            return program;
        }
  
        // The following functions are needed only when the option to preserve
        // the comments is active.
  
        function addComment(type, value, start, end, loc) {
            assert(typeof start === 'number', 'Comment must have valid position');
  
            // Because the way the actual token is scanned, often the comments
            // (if any) are skipped twice during the lexical analysis.
            // Thus, we need to skip adding a comment if the comment array already
            // handled it.
            if (extra.comments.length > 0) {
                if (extra.comments[extra.comments.length - 1].range[1] > start) {
                    return;
                }
            }
  
            extra.comments.push({
                type: type,
                value: value,
                range: [start, end],
                loc: loc
            });
        }
  
        function scanComment() {
            var comment, ch, loc, start, blockComment, lineComment;
  
            comment = '';
            blockComment = false;
            lineComment = false;
  
            while (index < length) {
                ch = source[index];
  
                if (lineComment) {
                    ch = source[index++];
                    if (isLineTerminator(ch)) {
                        loc.end = {
                            line: lineNumber,
                            column: index - lineStart - 1
                        };
                        lineComment = false;
                        addComment('Line', comment, start, index - 1, loc);
                        if (ch === '\r' && source[index] === '\n') {
                            ++index;
                        }
                        ++lineNumber;
                        lineStart = index;
                        comment = '';
                    } else if (index >= length) {
                        lineComment = false;
                        comment += ch;
                        loc.end = {
                            line: lineNumber,
                            column: length - lineStart
                        };
                        addComment('Line', comment, start, length, loc);
                    } else {
                        comment += ch;
                    }
                } else if (blockComment) {
                    if (isLineTerminator(ch)) {
                        if (ch === '\r' && source[index + 1] === '\n') {
                            ++index;
                            comment += '\r\n';
                        } else {
                            comment += ch;
                        }
                        ++lineNumber;
                        ++index;
                        lineStart = index;
                        if (index >= length) {
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
                    } else {
                        ch = source[index++];
                        if (index >= length) {
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
                        comment += ch;
                        if (ch === '*') {
                            ch = source[index];
                            if (ch === '/') {
                                comment = comment.substr(0, comment.length - 1);
                                blockComment = false;
                                ++index;
                                loc.end = {
                                    line: lineNumber,
                                    column: index - lineStart
                                };
                                addComment('Block', comment, start, index, loc);
                                comment = '';
                            }
                        }
                    }
                } else if (ch === '/') {
                    ch = source[index + 1];
                    if (ch === '/') {
                        loc = {
                            start: {
                                line: lineNumber,
                                column: index - lineStart
                            }
                        };
                        start = index;
                        index += 2;
                        lineComment = true;
                        if (index >= length) {
                            loc.end = {
                                line: lineNumber,
                                column: index - lineStart
                            };
                            lineComment = false;
                            addComment('Line', comment, start, index, loc);
                        }
                    } else if (ch === '*') {
                        start = index;
                        index += 2;
                        blockComment = true;
                        loc = {
                            start: {
                                line: lineNumber,
                                column: index - lineStart - 2
                            }
                        };
                        if (index >= length) {
                            throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                        }
                    } else {
                        break;
                    }
                } else if (isWhiteSpace(ch)) {
                    ++index;
                } else if (isLineTerminator(ch)) {
                    ++index;
                    if (ch ===  '\r' && source[index] === '\n') {
                        ++index;
                    }
                    ++lineNumber;
                    lineStart = index;
                } else {
                    break;
                }
            }
        }
  
        function filterCommentLocation() {
            var i, entry, comment, comments = [];
  
            for (i = 0; i < extra.comments.length; ++i) {
                entry = extra.comments[i];
                comment = {
                    type: entry.type,
                    value: entry.value
                };
                if (extra.range) {
                    comment.range = entry.range;
                }
                if (extra.loc) {
                    comment.loc = entry.loc;
                }
                comments.push(comment);
            }
  
            extra.comments = comments;
        }
  
        function collectToken() {
            var start, loc, token, range, value;
  
            skipComment();
            start = index;
            loc = {
                start: {
                    line: lineNumber,
                    column: index - lineStart
                }
            };
  
            token = extra.advance();
            loc.end = {
                line: lineNumber,
                column: index - lineStart
            };
  
            if (token.type !== Token.EOF) {
                range = [token.range[0], token.range[1]];
                value = sliceSource(token.range[0], token.range[1]);
                extra.tokens.push({
                    type: TokenName[token.type],
                    value: value,
                    range: range,
                    loc: loc
                });
            }
  
            return token;
        }
  
        function collectRegex() {
            var pos, loc, regex, token;
  
            skipComment();
  
            pos = index;
            loc = {
                start: {
                    line: lineNumber,
                    column: index - lineStart
                }
            };
  
            regex = extra.scanRegExp();
            loc.end = {
                line: lineNumber,
                column: index - lineStart
            };
  
            // Pop the previous token, which is likely '/' or '/='
            if (extra.tokens.length > 0) {
                token = extra.tokens[extra.tokens.length - 1];
                if (token.range[0] === pos && token.type === 'Punctuator') {
                    if (token.value === '/' || token.value === '/=') {
                        extra.tokens.pop();
                    }
                }
            }
  
            extra.tokens.push({
                type: 'RegularExpression',
                value: regex.literal,
                range: [pos, index],
                loc: loc
            });
  
            return regex;
        }
  
        function filterTokenLocation() {
            var i, entry, token, tokens = [];
  
            for (i = 0; i < extra.tokens.length; ++i) {
                entry = extra.tokens[i];
                token = {
                    type: entry.type,
                    value: entry.value
                };
                if (extra.range) {
                    token.range = entry.range;
                }
                if (extra.loc) {
                    token.loc = entry.loc;
                }
                tokens.push(token);
            }
  
            extra.tokens = tokens;
        }
  
        function createLiteral(token) {
            return {
                type: Syntax.Literal,
                value: token.value
            };
        }
  
        function createRawLiteral(token) {
            return {
                type: Syntax.Literal,
                value: token.value,
                raw: sliceSource(token.range[0], token.range[1])
            };
        }
  
        function createLocationMarker() {
            var marker = {};
  
            marker.range = [index, index];
            marker.loc = {
                start: {
                    line: lineNumber,
                    column: index - lineStart
                },
                end: {
                    line: lineNumber,
                    column: index - lineStart
                }
            };
  
            marker.end = function () {
                this.range[1] = index;
                this.loc.end.line = lineNumber;
                this.loc.end.column = index - lineStart;
            };
  
            marker.applyGroup = function (node) {
                if (extra.range) {
                    node.groupRange = [this.range[0], this.range[1]];
                }
                if (extra.loc) {
                    node.groupLoc = {
                        start: {
                            line: this.loc.start.line,
                            column: this.loc.start.column
                        },
                        end: {
                            line: this.loc.end.line,
                            column: this.loc.end.column
                        }
                    };
                }
            };
  
            marker.apply = function (node) {
                if (extra.range) {
                    node.range = [this.range[0], this.range[1]];
                }
                if (extra.loc) {
                    node.loc = {
                        start: {
                            line: this.loc.start.line,
                            column: this.loc.start.column
                        },
                        end: {
                            line: this.loc.end.line,
                            column: this.loc.end.column
                        }
                    };
                }
            };
  
            return marker;
        }
  
        function trackGroupExpression() {
            var marker, expr;
  
            skipComment();
            marker = createLocationMarker();
            expect('(');
  
            expr = parseExpression();
  
            expect(')');
  
            marker.end();
            marker.applyGroup(expr);
  
            return expr;
        }
  
        function trackLeftHandSideExpression() {
            var marker, expr;
  
            skipComment();
            marker = createLocationMarker();
  
            expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
  
            while (match('.') || match('[')) {
                if (match('[')) {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: true,
                        object: expr,
                        property: parseComputedMember()
                    };
                    marker.end();
                    marker.apply(expr);
                } else {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: false,
                        object: expr,
                        property: parseNonComputedMember()
                    };
                    marker.end();
                    marker.apply(expr);
                }
            }
  
            return expr;
        }
  
        function trackLeftHandSideExpressionAllowCall() {
            var marker, expr;
  
            skipComment();
            marker = createLocationMarker();
  
            expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
  
            while (match('.') || match('[') || match('(')) {
                if (match('(')) {
                    expr = {
                        type: Syntax.CallExpression,
                        callee: expr,
                        'arguments': parseArguments()
                    };
                    marker.end();
                    marker.apply(expr);
                } else if (match('[')) {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: true,
                        object: expr,
                        property: parseComputedMember()
                    };
                    marker.end();
                    marker.apply(expr);
                } else {
                    expr = {
                        type: Syntax.MemberExpression,
                        computed: false,
                        object: expr,
                        property: parseNonComputedMember()
                    };
                    marker.end();
                    marker.apply(expr);
                }
            }
  
            return expr;
        }
  
        function filterGroup(node) {
            var n, i, entry;
  
            n = (Object.prototype.toString.apply(node) === '[object Array]') ? [] : {};
            for (i in node) {
                if (node.hasOwnProperty(i) && i !== 'groupRange' && i !== 'groupLoc') {
                    entry = node[i];
                    if (entry === null || typeof entry !== 'object' || entry instanceof RegExp) {
                        n[i] = entry;
                    } else {
                        n[i] = filterGroup(entry);
                    }
                }
            }
            return n;
        }
  
        function wrapTrackingFunction(range, loc) {
  
            return function (parseFunction) {
  
                function isBinary(node) {
                    return node.type === Syntax.LogicalExpression ||
                        node.type === Syntax.BinaryExpression;
                }
  
                function visit(node) {
                    var start, end;
  
                    if (isBinary(node.left)) {
                        visit(node.left);
                    }
                    if (isBinary(node.right)) {
                        visit(node.right);
                    }
  
                    if (range) {
                        if (node.left.groupRange || node.right.groupRange) {
                            start = node.left.groupRange ? node.left.groupRange[0] : node.left.range[0];
                            end = node.right.groupRange ? node.right.groupRange[1] : node.right.range[1];
                            node.range = [start, end];
                        } else if (typeof node.range === 'undefined') {
                            start = node.left.range[0];
                            end = node.right.range[1];
                            node.range = [start, end];
                        }
                    }
                    if (loc) {
                        if (node.left.groupLoc || node.right.groupLoc) {
                            start = node.left.groupLoc ? node.left.groupLoc.start : node.left.loc.start;
                            end = node.right.groupLoc ? node.right.groupLoc.end : node.right.loc.end;
                            node.loc = {
                                start: start,
                                end: end
                            };
                        } else if (typeof node.loc === 'undefined') {
                            node.loc = {
                                start: node.left.loc.start,
                                end: node.right.loc.end
                            };
                        }
                    }
                }
  
                return function () {
                    var marker, node;
  
                    skipComment();
  
                    marker = createLocationMarker();
                    node = parseFunction.apply(null, arguments);
                    marker.end();
  
                    if (range && typeof node.range === 'undefined') {
                        marker.apply(node);
                    }
  
                    if (loc && typeof node.loc === 'undefined') {
                        marker.apply(node);
                    }
  
                    if (isBinary(node)) {
                        visit(node);
                    }
  
                    return node;
                };
            };
        }
  
        function patch() {
  
            var wrapTracking;
  
            if (extra.comments) {
                extra.skipComment = skipComment;
                skipComment = scanComment;
            }
  
            if (extra.raw) {
                extra.createLiteral = createLiteral;
                createLiteral = createRawLiteral;
            }
  
            if (extra.range || extra.loc) {
  
                extra.parseGroupExpression = parseGroupExpression;
                extra.parseLeftHandSideExpression = parseLeftHandSideExpression;
                extra.parseLeftHandSideExpressionAllowCall = parseLeftHandSideExpressionAllowCall;
                parseGroupExpression = trackGroupExpression;
                parseLeftHandSideExpression = trackLeftHandSideExpression;
                parseLeftHandSideExpressionAllowCall = trackLeftHandSideExpressionAllowCall;
  
                wrapTracking = wrapTrackingFunction(extra.range, extra.loc);
  
                extra.parseAdditiveExpression = parseAdditiveExpression;
                extra.parseAssignmentExpression = parseAssignmentExpression;
                extra.parseBitwiseANDExpression = parseBitwiseANDExpression;
                extra.parseBitwiseORExpression = parseBitwiseORExpression;
                extra.parseBitwiseXORExpression = parseBitwiseXORExpression;
                extra.parseBlock = parseBlock;
                extra.parseFunctionSourceElements = parseFunctionSourceElements;
                extra.parseCatchClause = parseCatchClause;
                extra.parseComputedMember = parseComputedMember;
                extra.parseConditionalExpression = parseConditionalExpression;
                extra.parseConstLetDeclaration = parseConstLetDeclaration;
                extra.parseEqualityExpression = parseEqualityExpression;
                extra.parseExpression = parseExpression;
                extra.parseForVariableDeclaration = parseForVariableDeclaration;
                extra.parseFunctionDeclaration = parseFunctionDeclaration;
                extra.parseFunctionExpression = parseFunctionExpression;
                extra.parseLogicalANDExpression = parseLogicalANDExpression;
                extra.parseLogicalORExpression = parseLogicalORExpression;
                extra.parseMultiplicativeExpression = parseMultiplicativeExpression;
                extra.parseNewExpression = parseNewExpression;
                extra.parseNonComputedProperty = parseNonComputedProperty;
                extra.parseObjectProperty = parseObjectProperty;
                extra.parseObjectPropertyKey = parseObjectPropertyKey;
                extra.parsePostfixExpression = parsePostfixExpression;
                extra.parsePrimaryExpression = parsePrimaryExpression;
                extra.parseProgram = parseProgram;
                extra.parsePropertyFunction = parsePropertyFunction;
                extra.parseRelationalExpression = parseRelationalExpression;
                extra.parseStatement = parseStatement;
                extra.parseShiftExpression = parseShiftExpression;
                extra.parseSwitchCase = parseSwitchCase;
                extra.parseUnaryExpression = parseUnaryExpression;
                extra.parseVariableDeclaration = parseVariableDeclaration;
                extra.parseVariableIdentifier = parseVariableIdentifier;
  
                parseAdditiveExpression = wrapTracking(extra.parseAdditiveExpression);
                parseAssignmentExpression = wrapTracking(extra.parseAssignmentExpression);
                parseBitwiseANDExpression = wrapTracking(extra.parseBitwiseANDExpression);
                parseBitwiseORExpression = wrapTracking(extra.parseBitwiseORExpression);
                parseBitwiseXORExpression = wrapTracking(extra.parseBitwiseXORExpression);
                parseBlock = wrapTracking(extra.parseBlock);
                parseFunctionSourceElements = wrapTracking(extra.parseFunctionSourceElements);
                parseCatchClause = wrapTracking(extra.parseCatchClause);
                parseComputedMember = wrapTracking(extra.parseComputedMember);
                parseConditionalExpression = wrapTracking(extra.parseConditionalExpression);
                parseConstLetDeclaration = wrapTracking(extra.parseConstLetDeclaration);
                parseEqualityExpression = wrapTracking(extra.parseEqualityExpression);
                parseExpression = wrapTracking(extra.parseExpression);
                parseForVariableDeclaration = wrapTracking(extra.parseForVariableDeclaration);
                parseFunctionDeclaration = wrapTracking(extra.parseFunctionDeclaration);
                parseFunctionExpression = wrapTracking(extra.parseFunctionExpression);
                parseLeftHandSideExpression = wrapTracking(parseLeftHandSideExpression);
                parseLogicalANDExpression = wrapTracking(extra.parseLogicalANDExpression);
                parseLogicalORExpression = wrapTracking(extra.parseLogicalORExpression);
                parseMultiplicativeExpression = wrapTracking(extra.parseMultiplicativeExpression);
                parseNewExpression = wrapTracking(extra.parseNewExpression);
                parseNonComputedProperty = wrapTracking(extra.parseNonComputedProperty);
                parseObjectProperty = wrapTracking(extra.parseObjectProperty);
                parseObjectPropertyKey = wrapTracking(extra.parseObjectPropertyKey);
                parsePostfixExpression = wrapTracking(extra.parsePostfixExpression);
                parsePrimaryExpression = wrapTracking(extra.parsePrimaryExpression);
                parseProgram = wrapTracking(extra.parseProgram);
                parsePropertyFunction = wrapTracking(extra.parsePropertyFunction);
                parseRelationalExpression = wrapTracking(extra.parseRelationalExpression);
                parseStatement = wrapTracking(extra.parseStatement);
                parseShiftExpression = wrapTracking(extra.parseShiftExpression);
                parseSwitchCase = wrapTracking(extra.parseSwitchCase);
                parseUnaryExpression = wrapTracking(extra.parseUnaryExpression);
                parseVariableDeclaration = wrapTracking(extra.parseVariableDeclaration);
                parseVariableIdentifier = wrapTracking(extra.parseVariableIdentifier);
            }
  
            if (typeof extra.tokens !== 'undefined') {
                extra.advance = advance;
                extra.scanRegExp = scanRegExp;
  
                advance = collectToken;
                scanRegExp = collectRegex;
            }
        }
  
        function unpatch() {
            if (typeof extra.skipComment === 'function') {
                skipComment = extra.skipComment;
            }
  
            if (extra.raw) {
                createLiteral = extra.createLiteral;
            }
  
            if (extra.range || extra.loc) {
                parseAdditiveExpression = extra.parseAdditiveExpression;
                parseAssignmentExpression = extra.parseAssignmentExpression;
                parseBitwiseANDExpression = extra.parseBitwiseANDExpression;
                parseBitwiseORExpression = extra.parseBitwiseORExpression;
                parseBitwiseXORExpression = extra.parseBitwiseXORExpression;
                parseBlock = extra.parseBlock;
                parseFunctionSourceElements = extra.parseFunctionSourceElements;
                parseCatchClause = extra.parseCatchClause;
                parseComputedMember = extra.parseComputedMember;
                parseConditionalExpression = extra.parseConditionalExpression;
                parseConstLetDeclaration = extra.parseConstLetDeclaration;
                parseEqualityExpression = extra.parseEqualityExpression;
                parseExpression = extra.parseExpression;
                parseForVariableDeclaration = extra.parseForVariableDeclaration;
                parseFunctionDeclaration = extra.parseFunctionDeclaration;
                parseFunctionExpression = extra.parseFunctionExpression;
                parseGroupExpression = extra.parseGroupExpression;
                parseLeftHandSideExpression = extra.parseLeftHandSideExpression;
                parseLeftHandSideExpressionAllowCall = extra.parseLeftHandSideExpressionAllowCall;
                parseLogicalANDExpression = extra.parseLogicalANDExpression;
                parseLogicalORExpression = extra.parseLogicalORExpression;
                parseMultiplicativeExpression = extra.parseMultiplicativeExpression;
                parseNewExpression = extra.parseNewExpression;
                parseNonComputedProperty = extra.parseNonComputedProperty;
                parseObjectProperty = extra.parseObjectProperty;
                parseObjectPropertyKey = extra.parseObjectPropertyKey;
                parsePrimaryExpression = extra.parsePrimaryExpression;
                parsePostfixExpression = extra.parsePostfixExpression;
                parseProgram = extra.parseProgram;
                parsePropertyFunction = extra.parsePropertyFunction;
                parseRelationalExpression = extra.parseRelationalExpression;
                parseStatement = extra.parseStatement;
                parseShiftExpression = extra.parseShiftExpression;
                parseSwitchCase = extra.parseSwitchCase;
                parseUnaryExpression = extra.parseUnaryExpression;
                parseVariableDeclaration = extra.parseVariableDeclaration;
                parseVariableIdentifier = extra.parseVariableIdentifier;
            }
  
            if (typeof extra.scanRegExp === 'function') {
                advance = extra.advance;
                scanRegExp = extra.scanRegExp;
            }
        }
  
        function stringToArray(str) {
            var length = str.length,
                result = [],
                i;
            for (i = 0; i < length; ++i) {
                result[i] = str.charAt(i);
            }
            return result;
        }
  
        function parse(code, options) {
            var program, toString;
  
            toString = String;
            if (typeof code !== 'string' && !(code instanceof String)) {
                code = toString(code);
            }
  
            source = code;
            index = 0;
            lineNumber = (source.length > 0) ? 1 : 0;
            lineStart = 0;
            length = source.length;
            buffer = null;
            state = {
                allowIn: true,
                labelSet: {},
                inFunctionBody: false,
                inIteration: false,
                inSwitch: false
            };
  
            extra = {};
            if (typeof options !== 'undefined') {
                extra.range = (typeof options.range === 'boolean') && options.range;
                extra.loc = (typeof options.loc === 'boolean') && options.loc;
                extra.raw = (typeof options.raw === 'boolean') && options.raw;
                if (typeof options.tokens === 'boolean' && options.tokens) {
                    extra.tokens = [];
                }
                if (typeof options.comment === 'boolean' && options.comment) {
                    extra.comments = [];
                }
                if (typeof options.tolerant === 'boolean' && options.tolerant) {
                    extra.errors = [];
                }
            }
  
            if (length > 0) {
                if (typeof source[0] === 'undefined') {
                    // Try first to convert to a string. This is good as fast path
                    // for old IE which understands string indexing for string
                    // literals only and not for string object.
                    if (code instanceof String) {
                        source = code.valueOf();
                    }
  
                    // Force accessing the characters via an array.
                    if (typeof source[0] === 'undefined') {
                        source = stringToArray(code);
                    }
                }
            }
  
            patch();
            try {
                program = parseProgram();
                if (typeof extra.comments !== 'undefined') {
                    filterCommentLocation();
                    program.comments = extra.comments;
                }
                if (typeof extra.tokens !== 'undefined') {
                    filterTokenLocation();
                    program.tokens = extra.tokens;
                }
                if (typeof extra.errors !== 'undefined') {
                    program.errors = extra.errors;
                }
                if (extra.range || extra.loc) {
                    program.body = filterGroup(program.body);
                }
            } catch (e) {
                throw e;
            } finally {
                unpatch();
                extra = {};
            }
  
            return program;
        }
  
        // Sync with package.json.
        exports.version = '1.0.4';
  
        exports.parse = parse;
  
        // Deep copy.
        exports.Syntax = (function () {
            var name, types = {};
  
            if (typeof Object.create === 'function') {
                types = Object.create(null);
            }
  
            for (name in Syntax) {
                if (Syntax.hasOwnProperty(name)) {
                    types[name] = Syntax[name];
                }
            }
  
            if (typeof Object.freeze === 'function') {
                Object.freeze(types);
            }
  
            return types;
        }());
  
    }));
    /* vim: set sw=4 ts=4 et tw=80 : */
    return module.exports;
    })({exports:{}});
  
    var index = (function (module, global) {
    var exports = module.exports;
    var parse = esprima.parse
    var hoist = index$1
  
    var InfiniteChecker = infiniteChecker
    var Primitives = primitives
  
    module.exports = safeEval
    module.exports.FunctionFactory = FunctionFactory
    module.exports.Function = FunctionFactory()
  
    var maxIterations = 1000000
  
    // 'eval' with a controlled environment
    function safeEval(src, parentContext){
      var tree = prepareAst(src)
      var context = Object.create(parentContext || {})
      return finalValue(evaluateAst(tree, context))
    }
  
    // create a 'Function' constructor for a controlled environment
    function FunctionFactory(parentContext){
      var context = Object.create(parentContext || {})
      return function Function() {
        // normalize arguments array
        var args = Array.prototype.slice.call(arguments)
        var src = args.slice(-1)[0]
        args = args.slice(0,-1)
        if (typeof src === 'string'){
          //HACK: esprima doesn't like returns outside functions
          src = parse('function a(){' + src + '}').body[0].body
        }
        var tree = prepareAst(src)
        return getFunction(tree, args, context)
      }
    }
  
    // takes an AST or js source and returns an AST
    function prepareAst(src){
      var tree = (typeof src === 'string') ? parse(src) : src
      return hoist(tree)
    }
  
    // evaluate an AST in the given context
    function evaluateAst(tree, context){
  
      var safeFunction = FunctionFactory(context)
      var primitives = Primitives(context)
  
      // block scoped context for catch (ex) and 'let'
      var blockContext = context
  
      return walk(tree)
  
      // recursively walk every node in an array
      function walkAll(nodes){
        var result = undefined
        for (var i=0;i<nodes.length;i++){
          var childNode = nodes[i]
          if (childNode.type === 'EmptyStatement') continue
          result = walk(childNode)
          if (result instanceof ReturnValue){
            return result
          }
        }
        return result
      }
  
      // recursively evalutate the node of an AST
      function walk(node){
        if (!node) return
        switch (node.type) {
  
          case 'Program':
            return walkAll(node.body)
  
          case 'BlockStatement':
            enterBlock()
            var result = walkAll(node.body)
            leaveBlock()
            return result
  
          case 'FunctionDeclaration':
            var params = node.params.map(getName)
            var value = getFunction(node.body, params, blockContext)
            return context[node.id.name] = value
  
          case 'FunctionExpression':
            var params = node.params.map(getName)
            return getFunction(node.body, params, blockContext)
  
          case 'ReturnStatement':
            var value = walk(node.argument)
            return new ReturnValue('return', value)
  
          case 'BreakStatement':
            return new ReturnValue('break')
  
          case 'ContinueStatement':
            return new ReturnValue('continue')
  
          case 'ExpressionStatement':
            return walk(node.expression)
  
          case 'AssignmentExpression':
            return setValue(blockContext, node.left, node.right, node.operator)
  
          case 'UpdateExpression':
            return setValue(blockContext, node.argument, null, node.operator)
  
          case 'VariableDeclaration':
            node.declarations.forEach(function(declaration){
              var target = node.kind === 'let' ? blockContext : context
              if (declaration.init){
                target[declaration.id.name] = walk(declaration.init)
              } else {
                target[declaration.id.name] = undefined
              }
            })
            break
  
          case 'SwitchStatement':
            var defaultHandler = null
            var matched = false
            var value = walk(node.discriminant)
            var result = undefined
  
            enterBlock()
  
            var i = 0
            while (result == null){
              if (i<node.cases.length){
                if (node.cases[i].test){ // check or fall through
                  matched = matched || (walk(node.cases[i].test) === value)
                } else if (defaultHandler == null) {
                  defaultHandler = i
                }
                if (matched){
                  var r = walkAll(node.cases[i].consequent)
                  if (r instanceof ReturnValue){ // break out
                    if (r.type == 'break') break
                    result = r
                  }
                }
                i += 1 // continue
              } else if (!matched && defaultHandler != null){
                // go back and do the default handler
                i = defaultHandler
                matched = true
              } else {
                // nothing we can do
                break
              }
            }
  
            leaveBlock()
            return result
  
          case 'IfStatement':
            if (walk(node.test)){
              return walk(node.consequent)
            } else if (node.alternate) {
              return walk(node.alternate)
            }
  
          case 'ForStatement':
            var infinite = InfiniteChecker(maxIterations)
            var result = undefined
  
            enterBlock() // allow lets on delarations
            for (walk(node.init); walk(node.test); walk(node.update)){
              var r = walk(node.body)
  
              // handle early return, continue and break
              if (r instanceof ReturnValue){
                if (r.type == 'continue') continue
                if (r.type == 'break') break
                result = r
                break
              }
  
              infinite.check()
            }
            leaveBlock()
            return result
  
          case 'ForInStatement':
            var infinite = InfiniteChecker(maxIterations)
            var result = undefined
  
            var value = walk(node.right)
            var property = node.left
  
            var target = context
            enterBlock()
  
            if (property.type == 'VariableDeclaration'){
              walk(property)
              property = property.declarations[0].id
              if (property.kind === 'let'){
                target = blockContext
              }
            }
  
            for (var key in value){
              setValue(target, property, {type: 'Literal', value: key})
              var r = walk(node.body)
  
              // handle early return, continue and break
              if (r instanceof ReturnValue){
                if (r.type == 'continue') continue
                if (r.type == 'break') break
                result = r
                break
              }
  
              infinite.check()
            }
            leaveBlock()
  
            return result
  
          case 'WhileStatement':
            var infinite = InfiniteChecker(maxIterations)
            while (walk(node.test)){
              walk(node.body)
              infinite.check()
            }
            break
  
          case 'TryStatement':
            try {
              walk(node.block)
            } catch (error) {
              enterBlock()
              var catchClause = node.handlers[0]
              if (catchClause) {
                blockContext[catchClause.param.name] = error
                walk(catchClause.body)
              }
              leaveBlock()
            } finally {
              if (node.finalizer) {
                walk(node.finalizer)
              }
            }
            break
  
          case 'Literal':
            return node.value
  
          case 'UnaryExpression':
            var val = walk(node.argument)
            switch(node.operator) {
              case '+': return +val
              case '-': return -val
              case '~': return ~val
              case '!': return !val
              case 'typeof': return typeof val
              default: return unsupportedExpression(node)
            }
  
          case 'ArrayExpression':
            var obj = blockContext['Array']()
            for (var i=0;i<node.elements.length;i++){
              obj.push(walk(node.elements[i]))
            }
            return obj
  
          case 'ObjectExpression':
            var obj = blockContext['Object']()
            for (var i = 0; i < node.properties.length; i++) {
              var prop = node.properties[i]
              var value = (prop.value === null) ? prop.value : walk(prop.value)
              obj[prop.key.value || prop.key.name] = value
            }
            return obj
  
          case 'NewExpression':
            var args = node.arguments.map(function(arg){
              return walk(arg)
            })
            var target = walk(node.callee)
            return primitives.applyNew(target, args)
  
  
          case 'BinaryExpression':
            var l = walk(node.left)
            var r = walk(node.right)
            switch(node.operator) {
              case '==':  return l === r
              case '===': return l === r
              case '!=':  return l != r
              case '!==': return l !== r
              case '+':   return l + r
              case '-':   return l - r
              case '*':   return l * r
              case '/':   return l / r
              case '%':   return l % r
              case '<':   return l < r
              case '<=':  return l <= r
              case '>':   return l > r
              case '>=':  return l >= r
              case '|':   return l | r
              case '&':   return l & r
              case '^':   return l ^ r
              case 'instanceof': return l instanceof r
              default: return unsupportedExpression(node)
            }
  
          case 'LogicalExpression':
            switch(node.operator) {
              case '&&':  return walk(node.left) && walk(node.right)
              case '||':  return walk(node.left) || walk(node.right)
              default: return unsupportedExpression(node)
            }
  
          case 'ThisExpression':
            return blockContext['this']
  
          case 'Identifier':
            if (node.name === 'undefined'){
              return undefined
            } else if (hasProperty(blockContext, node.name, primitives)){
              return finalValue(blockContext[node.name])
            } else {
              throw new ReferenceError(node.name + ' is not defined')
            }
  
          case 'CallExpression':
            var args = node.arguments.map(function(arg){
              return walk(arg)
            })
            var object = null
            var target = walk(node.callee)
  
            if (node.callee.type === 'MemberExpression'){
              object = walk(node.callee.object)
            }
            return target.apply(object, args)
  
          case 'MemberExpression':
            var obj = walk(node.object)
            if (node.computed){
              var prop = walk(node.property)
            } else {
              var prop = node.property.name
            }
            obj = primitives.getPropertyObject(obj, prop)
            return checkValue(obj[prop]);
  
          case 'ConditionalExpression':
            var val = walk(node.test)
            return val ? walk(node.consequent) : walk(node.alternate)
  
          case 'EmptyStatement':
            return
  
          default:
            return unsupportedExpression(node)
        }
      }
  
      // safely retrieve a value
      function checkValue(value){
        if (value === Function$1){
          value = safeFunction
        }
        return finalValue(value)
      }
  
      // block scope context control
      function enterBlock(){
        blockContext = Object.create(blockContext)
      }
      function leaveBlock(){
        blockContext = Object.getPrototypeOf(blockContext)
      }
  
      // set a value in the specified context if allowed
      function setValue(object, left, right, operator){
        var name = null
  
        if (left.type === 'Identifier'){
          name = left.name
          // handle parent context shadowing
          object = objectForKey(object, name, primitives)
        } else if (left.type === 'MemberExpression'){
          if (left.computed){
            name = walk(left.property)
          } else {
            name = left.property.name
          }
          object = walk(left.object)
        }
  
        // stop built in properties from being able to be changed
        if (canSetProperty(object, name, primitives)){
          switch(operator) {
            case undefined: return object[name] = walk(right)
            case '=':  return object[name] = walk(right)
            case '+=': return object[name] += walk(right)
            case '-=': return object[name] -= walk(right)
            case '++': return object[name]++
            case '--': return object[name]--
          }
        }
  
      }
  
    }
  
    // when an unsupported expression is encountered, throw an error
    function unsupportedExpression(node){
      console.error(node)
      var err = new Error('Unsupported expression: ' + node.type)
      err.node = node
      throw err
    }
  
    // walk a provided object's prototypal hierarchy to retrieve an inherited object
    function objectForKey(object, key, primitives){
      var proto = primitives.getPrototypeOf(object)
      if (!proto || hasOwnProperty(object, key)){
        return object
      } else {
        return objectForKey(proto, key, primitives)
      }
    }
  
    function hasProperty(object, key, primitives){
      var proto = primitives.getPrototypeOf(object)
      var hasOwn = hasOwnProperty(object, key)
      if (object[key] !== undefined){
        return true
      } else if (!proto || hasOwn){
        return hasOwn
      } else {
        return hasProperty(proto, key, primitives)
      }
    }
  
    function hasOwnProperty(object, key){
      return Object.prototype.hasOwnProperty.call(object, key)
    }
  
    function propertyIsEnumerable(object, key){
      return Object.prototype.propertyIsEnumerable.call(object, key)
    }
  
  
    // determine if we have write access to a property
    function canSetProperty(object, property, primitives){
      if (property === '__proto__' || primitives.isPrimitive(object)){
        return false
      } else if (object != null){
  
        if (hasOwnProperty(object, property)){
          if (propertyIsEnumerable(object, property)){
            return true
          } else {
            return false
          }
        } else {
          return canSetProperty(primitives.getPrototypeOf(object), property, primitives)
        }
  
      } else {
        return true
      }
    }
  
    // generate a function with specified context
    function getFunction(body, params, parentContext){
      return function(){
        var context = Object.create(parentContext)
        if (this == global){
          context['this'] = null
        } else {
          context['this'] = this
        }
        // normalize arguments array
        var args = Array.prototype.slice.call(arguments)
        context['arguments'] = arguments
        args.forEach(function(arg,idx){
          var param = params[idx]
          if (param){
            context[param] = arg
          }
        })
        var result = evaluateAst(body, context)
  
        if (result instanceof ReturnValue){
          return result.value
        }
      }
    }
  
    function finalValue(value){
      if (value instanceof ReturnValue){
        return value.value
      }
      return value
    }
  
    // get the name of an identifier
    function getName(identifier){
      return identifier.name
    }
  
    // a ReturnValue struct for differentiating between expression result and return statement
    function ReturnValue(type, value){
      this.type = type
      this.value = value
    }
    return module.exports;
    })({exports:{}}, __commonjs_global);
  
    var Function$1 = index.Function;
  
    var pathCache = new Cache(1000);
  
    // actions
    var APPEND = 0;
    var PUSH = 1;
    var INC_SUB_PATH_DEPTH = 2;
    var PUSH_SUB_PATH = 3;
  
    // states
    var BEFORE_PATH = 0;
    var IN_PATH = 1;
    var BEFORE_IDENT = 2;
    var IN_IDENT = 3;
    var IN_SUB_PATH = 4;
    var IN_SINGLE_QUOTE = 5;
    var IN_DOUBLE_QUOTE = 6;
    var AFTER_PATH = 7;
    var ERROR = 8;
  
    var pathStateMachine = [];
  
    pathStateMachine[BEFORE_PATH] = {
      'ws': [BEFORE_PATH],
      'ident': [IN_IDENT, APPEND],
      '[': [IN_SUB_PATH],
      'eof': [AFTER_PATH]
    };
  
    pathStateMachine[IN_PATH] = {
      'ws': [IN_PATH],
      '.': [BEFORE_IDENT],
      '[': [IN_SUB_PATH],
      'eof': [AFTER_PATH]
    };
  
    pathStateMachine[BEFORE_IDENT] = {
      'ws': [BEFORE_IDENT],
      'ident': [IN_IDENT, APPEND]
    };
  
    pathStateMachine[IN_IDENT] = {
      'ident': [IN_IDENT, APPEND],
      '0': [IN_IDENT, APPEND],
      'number': [IN_IDENT, APPEND],
      'ws': [IN_PATH, PUSH],
      '.': [BEFORE_IDENT, PUSH],
      '[': [IN_SUB_PATH, PUSH],
      'eof': [AFTER_PATH, PUSH]
    };
  
    pathStateMachine[IN_SUB_PATH] = {
      "'": [IN_SINGLE_QUOTE, APPEND],
      '"': [IN_DOUBLE_QUOTE, APPEND],
      '[': [IN_SUB_PATH, INC_SUB_PATH_DEPTH],
      ']': [IN_PATH, PUSH_SUB_PATH],
      'eof': ERROR,
      'else': [IN_SUB_PATH, APPEND]
    };
  
    pathStateMachine[IN_SINGLE_QUOTE] = {
      "'": [IN_SUB_PATH, APPEND],
      'eof': ERROR,
      'else': [IN_SINGLE_QUOTE, APPEND]
    };
  
    pathStateMachine[IN_DOUBLE_QUOTE] = {
      '"': [IN_SUB_PATH, APPEND],
      'eof': ERROR,
      'else': [IN_DOUBLE_QUOTE, APPEND]
    };
  
    /**
     * Determine the type of a character in a keypath.
     *
     * @param {Char} ch
     * @return {String} type
     */
  
    function getPathCharType(ch) {
      if (ch === undefined) {
        return 'eof';
      }
  
      var code = ch.charCodeAt(0);
  
      switch (code) {
        case 0x5B: // [
        case 0x5D: // ]
        case 0x2E: // .
        case 0x22: // "
        case 0x27: // '
        case 0x30:
          // 0
          return ch;
  
        case 0x5F: // _
        case 0x24:
          // $
          return 'ident';
  
        case 0x20: // Space
        case 0x09: // Tab
        case 0x0A: // Newline
        case 0x0D: // Return
        case 0xA0: // No-break space
        case 0xFEFF: // Byte Order Mark
        case 0x2028: // Line Separator
        case 0x2029:
          // Paragraph Separator
          return 'ws';
      }
  
      // a-z, A-Z
      if (code >= 0x61 && code <= 0x7A || code >= 0x41 && code <= 0x5A) {
        return 'ident';
      }
  
      // 1-9
      if (code >= 0x31 && code <= 0x39) {
        return 'number';
      }
  
      return 'else';
    }
  
    /**
     * Format a subPath, return its plain form if it is
     * a literal string or number. Otherwise prepend the
     * dynamic indicator (*).
     *
     * @param {String} path
     * @return {String}
     */
  
    function formatSubPath(path) {
      var trimmed = path.trim();
      // invalid leading 0
      if (path.charAt(0) === '0' && isNaN(path)) {
        return false;
      }
      return isLiteral(trimmed) ? stripQuotes(trimmed) : '*' + trimmed;
    }
  
    /**
     * Parse a string path into an array of segments
     *
     * @param {String} path
     * @return {Array|undefined}
     */
  
    function parse(path) {
      var keys = [];
      var index = -1;
      var mode = BEFORE_PATH;
      var subPathDepth = 0;
      var c, newChar, key, type, transition, action, typeMap;
  
      var actions = [];
  
      actions[PUSH] = function () {
        if (key !== undefined) {
          keys.push(key);
          key = undefined;
        }
      };
  
      actions[APPEND] = function () {
        if (key === undefined) {
          key = newChar;
        } else {
          key += newChar;
        }
      };
  
      actions[INC_SUB_PATH_DEPTH] = function () {
        actions[APPEND]();
        subPathDepth++;
      };
  
      actions[PUSH_SUB_PATH] = function () {
        if (subPathDepth > 0) {
          subPathDepth--;
          mode = IN_SUB_PATH;
          actions[APPEND]();
        } else {
          subPathDepth = 0;
          key = formatSubPath(key);
          if (key === false) {
            return false;
          } else {
            actions[PUSH]();
          }
        }
      };
  
      function maybeUnescapeQuote() {
        var nextChar = path[index + 1];
        if (mode === IN_SINGLE_QUOTE && nextChar === "'" || mode === IN_DOUBLE_QUOTE && nextChar === '"') {
          index++;
          newChar = '\\' + nextChar;
          actions[APPEND]();
          return true;
        }
      }
  
      while (mode != null) {
        index++;
        c = path[index];
  
        if (c === '\\' && maybeUnescapeQuote()) {
          continue;
        }
  
        type = getPathCharType(c);
        typeMap = pathStateMachine[mode];
        transition = typeMap[type] || typeMap['else'] || ERROR;
  
        if (transition === ERROR) {
          return; // parse error
        }
  
        mode = transition[0];
        action = actions[transition[1]];
        if (action) {
          newChar = transition[2];
          newChar = newChar === undefined ? c : newChar;
          if (action() === false) {
            return;
          }
        }
  
        if (mode === AFTER_PATH) {
          keys.raw = path;
          return keys;
        }
      }
    }
  
    /**
     * External parse that check for a cache hit first
     *
     * @param {String} path
     * @return {Array|undefined}
     */
  
    function parsePath(path) {
      var hit = pathCache.get(path);
      if (!hit) {
        hit = parse(path);
        if (hit) {
          pathCache.put(path, hit);
        }
      }
      return hit;
    }
  
    /**
     * Get from an object from a path string
     *
     * @param {Object} obj
     * @param {String} path
     */
  
    function getPath(obj, path) {
      return parseExpression(path).get(obj);
    }
  
    /**
     * Warn against setting non-existent root path on a vm.
     */
  
    var warnNonExistent;
    if ('development' !== 'production') {
      warnNonExistent = function (path, vm) {
        warn('You are setting a non-existent path "' + path.raw + '" ' + 'on a vm instance. Consider pre-initializing the property ' + 'with the "data" option for more reliable reactivity ' + 'and better performance.', vm);
      };
    }
  
    /**
     * Set on an object from a path
     *
     * @param {Object} obj
     * @param {String | Array} path
     * @param {*} val
     */
  
    function setPath(obj, path, val) {
      var original = obj;
      if (typeof path === 'string') {
        path = parse(path);
      }
      if (!path || !isObject(obj)) {
        return false;
      }
      var last, key;
      for (var i = 0, l = path.length; i < l; i++) {
        last = obj;
        key = path[i];
        if (key.charAt(0) === '*') {
          key = parseExpression(key.slice(1)).get.call(original, original);
        }
        if (i < l - 1) {
          obj = obj[key];
          if (!isObject(obj)) {
            obj = {};
            if ('development' !== 'production' && last._isVue) {
              warnNonExistent(path, last);
            }
            set(last, key, obj);
          }
        } else {
          if (isArray(obj)) {
            obj.$set(key, val);
          } else if (key in obj) {
            obj[key] = val;
          } else {
            if ('development' !== 'production' && obj._isVue) {
              warnNonExistent(path, obj);
            }
            set(obj, key, val);
          }
        }
      }
      return true;
    }
  
  var path = Object.freeze({
      parsePath: parsePath,
      getPath: getPath,
      setPath: setPath
    });
  
    var expressionCache = new Cache(1000);
  
    var allowedKeywords = 'Math,Date,this,true,false,null,undefined,Infinity,NaN,' + 'isNaN,isFinite,decodeURI,decodeURIComponent,encodeURI,' + 'encodeURIComponent,parseInt,parseFloat';
    var allowedKeywordsRE = new RegExp('^(' + allowedKeywords.replace(/,/g, '\\b|') + '\\b)');
  
    // keywords that don't make sense inside expressions
    var improperKeywords = 'break,case,class,catch,const,continue,debugger,default,' + 'delete,do,else,export,extends,finally,for,function,if,' + 'import,in,instanceof,let,return,super,switch,throw,try,' + 'var,while,with,yield,enum,await,implements,package,' + 'protected,static,interface,private,public';
    var improperKeywordsRE = new RegExp('^(' + improperKeywords.replace(/,/g, '\\b|') + '\\b)');
  
    var wsRE = /\s/g;
    var newlineRE = /\n/g;
    var saveRE = /[\{,]\s*[\w\$_]+\s*:|('(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`)|new |typeof |void /g;
    var restoreRE = /"(\d+)"/g;
    var pathTestRE = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['.*?'\]|\[".*?"\]|\[\d+\]|\[[A-Za-z_$][\w$]*\])*$/;
    var identRE = /[^\w$\.](?:[A-Za-z_$][\w$]*)/g;
    var literalValueRE$1 = /^(?:true|false|null|undefined|Infinity|NaN)$/;
  
    function noop() {}
  
    /**
     * Save / Rewrite / Restore
     *
     * When rewriting paths found in an expression, it is
     * possible for the same letter sequences to be found in
     * strings and Object literal property keys. Therefore we
     * remove and store these parts in a temporary array, and
     * restore them after the path rewrite.
     */
  
    var saved = [];
  
    /**
     * Save replacer
     *
     * The save regex can match two possible cases:
     * 1. An opening object literal
     * 2. A string
     * If matched as a plain string, we need to escape its
     * newlines, since the string needs to be preserved when
     * generating the function body.
     *
     * @param {String} str
     * @param {String} isString - str if matched as a string
     * @return {String} - placeholder with index
     */
  
    function save(str, isString) {
      var i = saved.length;
      saved[i] = isString ? str.replace(newlineRE, '\\n') : str;
      return '"' + i + '"';
    }
  
    /**
     * Path rewrite replacer
     *
     * @param {String} raw
     * @return {String}
     */
  
    function rewrite(raw) {
      var c = raw.charAt(0);
      var path = raw.slice(1);
      if (allowedKeywordsRE.test(path)) {
        return raw;
      } else {
        path = path.indexOf('"') > -1 ? path.replace(restoreRE, restore) : path;
        return c + 'scope.' + path;
      }
    }
  
    /**
     * Restore replacer
     *
     * @param {String} str
     * @param {String} i - matched save index
     * @return {String}
     */
  
    function restore(str, i) {
      return saved[i];
    }
  
    /**
     * Rewrite an expression, prefixing all path accessors with
     * `scope.` and generate getter/setter functions.
     *
     * @param {String} exp
     * @return {Function}
     */
  
    function compileGetter(exp) {
      if (improperKeywordsRE.test(exp)) {
        'development' !== 'production' && warn('Avoid using reserved keywords in expression: ' + exp);
      }
      // reset state
      saved.length = 0;
      // save strings and object literal keys
      var body = exp.replace(saveRE, save).replace(wsRE, '');
      // rewrite all paths
      // pad 1 space here because the regex matches 1 extra char
      body = (' ' + body).replace(identRE, rewrite).replace(restoreRE, restore);
      return makeGetterFn(body);
    }
  
    /**
     * Build a getter function. Requires eval.
     *
     * We isolate the try/catch so it doesn't affect the
     * optimization of the parse function when it is not called.
     *
     * @param {String} body
     * @return {Function|undefined}
     */
  
    function makeGetterFn(body) {
      try {
        var fn = index.Function('scope', 'Math', 'return ' + body);
        return function (scope) {
          return fn.call(this, scope, Math);
        };
      } catch (e) {
        if ('development' !== 'production') {
          /* istanbul ignore if */
          if (e.toString().match(/unsafe-eval|CSP/)) {
            warn('It seems you are using the default build of Vue.js in an environment ' + 'with Content Security Policy that prohibits unsafe-eval. ' + 'Use the CSP-compliant build instead: ' + 'http://vuejs.org/guide/installation.html#CSP-compliant-build');
          } else {
            warn('Invalid expression. ' + 'Generated function body: ' + body);
          }
        }
        return noop;
      }
    }
  
    /**
     * Compile a setter function for the expression.
     *
     * @param {String} exp
     * @return {Function|undefined}
     */
  
    function compileSetter(exp) {
      var path = parsePath(exp);
      if (path) {
        return function (scope, val) {
          setPath(scope, path, val);
        };
      } else {
        'development' !== 'production' && warn('Invalid setter expression: ' + exp);
      }
    }
  
    /**
     * Parse an expression into re-written getter/setters.
     *
     * @param {String} exp
     * @param {Boolean} needSet
     * @return {Function}
     */
  
    function parseExpression(exp, needSet) {
      exp = exp.trim();
      // try cache
      var hit = expressionCache.get(exp);
      if (hit) {
        if (needSet && !hit.set) {
          hit.set = compileSetter(hit.exp);
        }
        return hit;
      }
      var res = { exp: exp };
      res.get = isSimplePath(exp) && exp.indexOf('[') < 0
      // optimized super simple getter
      ? makeGetterFn('scope.' + exp)
      // dynamic getter
      : compileGetter(exp);
      if (needSet) {
        res.set = compileSetter(exp);
      }
      expressionCache.put(exp, res);
      return res;
    }
  
    /**
     * Check if an expression is a simple path.
     *
     * @param {String} exp
     * @return {Boolean}
     */
  
    function isSimplePath(exp) {
      return pathTestRE.test(exp) &&
      // don't treat literal values as paths
      !literalValueRE$1.test(exp) &&
      // Math constants e.g. Math.PI, Math.E etc.
      exp.slice(0, 5) !== 'Math.';
    }
  
  var expression = Object.freeze({
      parseExpression: parseExpression,
      isSimplePath: isSimplePath
    });
  
    // we have two separate queues: one for directive updates
    // and one for user watcher registered via $watch().
    // we want to guarantee directive updates to be called
    // before user watchers so that when user watchers are
    // triggered, the DOM would have already been in updated
    // state.
  
    var queue = [];
    var userQueue = [];
    var has = {};
    var circular = {};
    var waiting = false;
  
    /**
     * Reset the batcher's state.
     */
  
    function resetBatcherState() {
      queue.length = 0;
      userQueue.length = 0;
      has = {};
      circular = {};
      waiting = false;
    }
  
    /**
     * Flush both queues and run the watchers.
     */
  
    function flushBatcherQueue() {
      var _again = true;
  
      _function: while (_again) {
        _again = false;
  
        runBatcherQueue(queue);
        runBatcherQueue(userQueue);
        // user watchers triggered more watchers,
        // keep flushing until it depletes
        if (queue.length) {
          _again = true;
          continue _function;
        }
        // dev tool hook
        /* istanbul ignore if */
        if (devtools && config.devtools) {
          devtools.emit('flush');
        }
        resetBatcherState();
      }
    }
  
    /**
     * Run the watchers in a single queue.
     *
     * @param {Array} queue
     */
  
    function runBatcherQueue(queue) {
      // do not cache length because more watchers might be pushed
      // as we run existing watchers
      for (var i = 0; i < queue.length; i++) {
        var watcher = queue[i];
        var id = watcher.id;
        has[id] = null;
        watcher.run();
        // in dev build, check and stop circular updates.
        if ('development' !== 'production' && has[id] != null) {
          circular[id] = (circular[id] || 0) + 1;
          if (circular[id] > config._maxUpdateCount) {
            warn('You may have an infinite update loop for watcher ' + 'with expression "' + watcher.expression + '"', watcher.vm);
            break;
          }
        }
      }
      queue.length = 0;
    }
  
    /**
     * Push a watcher into the watcher queue.
     * Jobs with duplicate IDs will be skipped unless it's
     * pushed when the queue is being flushed.
     *
     * @param {Watcher} watcher
     *   properties:
     *   - {Number} id
     *   - {Function} run
     */
  
    function pushWatcher(watcher) {
      var id = watcher.id;
      if (has[id] == null) {
        // push watcher into appropriate queue
        var q = watcher.user ? userQueue : queue;
        has[id] = q.length;
        q.push(watcher);
        // queue the flush
        if (!waiting) {
          waiting = true;
          nextTick(flushBatcherQueue);
        }
      }
    }
  
    var uid$2 = 0;
  
    /**
     * A watcher parses an expression, collects dependencies,
     * and fires callback when the expression value changes.
     * This is used for both the $watch() api and directives.
     *
     * @param {Vue} vm
     * @param {String|Function} expOrFn
     * @param {Function} cb
     * @param {Object} options
     *                 - {Array} filters
     *                 - {Boolean} twoWay
     *                 - {Boolean} deep
     *                 - {Boolean} user
     *                 - {Boolean} sync
     *                 - {Boolean} lazy
     *                 - {Function} [preProcess]
     *                 - {Function} [postProcess]
     * @constructor
     */
    function Watcher(vm, expOrFn, cb, options) {
      // mix in options
      if (options) {
        extend(this, options);
      }
      var isFn = typeof expOrFn === 'function';
      this.vm = vm;
      vm._watchers.push(this);
      this.expression = expOrFn;
      this.cb = cb;
      this.id = ++uid$2; // uid for batching
      this.active = true;
      this.dirty = this.lazy; // for lazy watchers
      this.deps = [];
      this.newDeps = [];
      this.depIds = new _Set();
      this.newDepIds = new _Set();
      this.prevError = null; // for async error stacks
      // parse expression for getter/setter
      if (isFn) {
        this.getter = expOrFn;
        this.setter = undefined;
      } else {
        var res = parseExpression(expOrFn, this.twoWay);
        this.getter = res.get;
        this.setter = res.set;
      }
      this.value = this.lazy ? undefined : this.get();
      // state for avoiding false triggers for deep and Array
      // watchers during vm._digest()
      this.queued = this.shallow = false;
    }
  
    /**
     * Evaluate the getter, and re-collect dependencies.
     */
  
    Watcher.prototype.get = function () {
      this.beforeGet();
      var scope = this.scope || this.vm;
      var value;
      try {
        value = this.getter.call(scope, scope);
      } catch (e) {
        if ('development' !== 'production' && config.warnExpressionErrors) {
          warn('Error when evaluating expression ' + '"' + this.expression + '": ' + e.toString(), this.vm);
        }
      }
      // "touch" every property so they are all tracked as
      // dependencies for deep watching
      if (this.deep) {
        traverse(value);
      }
      if (this.preProcess) {
        value = this.preProcess(value);
      }
      if (this.filters) {
        value = scope._applyFilters(value, null, this.filters, false);
      }
      if (this.postProcess) {
        value = this.postProcess(value);
      }
      this.afterGet();
      return value;
    };
  
    /**
     * Set the corresponding value with the setter.
     *
     * @param {*} value
     */
  
    Watcher.prototype.set = function (value) {
      var scope = this.scope || this.vm;
      if (this.filters) {
        value = scope._applyFilters(value, this.value, this.filters, true);
      }
      try {
        this.setter.call(scope, scope, value);
      } catch (e) {
        if ('development' !== 'production' && config.warnExpressionErrors) {
          warn('Error when evaluating setter ' + '"' + this.expression + '": ' + e.toString(), this.vm);
        }
      }
      // two-way sync for v-for alias
      var forContext = scope.$forContext;
      if (forContext && forContext.alias === this.expression) {
        if (forContext.filters) {
          'development' !== 'production' && warn('It seems you are using two-way binding on ' + 'a v-for alias (' + this.expression + '), and the ' + 'v-for has filters. This will not work properly. ' + 'Either remove the filters or use an array of ' + 'objects and bind to object properties instead.', this.vm);
          return;
        }
        forContext._withLock(function () {
          if (scope.$key) {
            // original is an object
            forContext.rawValue[scope.$key] = value;
          } else {
            forContext.rawValue.$set(scope.$index, value);
          }
        });
      }
    };
  
    /**
     * Prepare for dependency collection.
     */
  
    Watcher.prototype.beforeGet = function () {
      Dep.target = this;
    };
  
    /**
     * Add a dependency to this directive.
     *
     * @param {Dep} dep
     */
  
    Watcher.prototype.addDep = function (dep) {
      var id = dep.id;
      if (!this.newDepIds.has(id)) {
        this.newDepIds.add(id);
        this.newDeps.push(dep);
        if (!this.depIds.has(id)) {
          dep.addSub(this);
        }
      }
    };
  
    /**
     * Clean up for dependency collection.
     */
  
    Watcher.prototype.afterGet = function () {
      Dep.target = null;
      var i = this.deps.length;
      while (i--) {
        var dep = this.deps[i];
        if (!this.newDepIds.has(dep.id)) {
          dep.removeSub(this);
        }
      }
      var tmp = this.depIds;
      this.depIds = this.newDepIds;
      this.newDepIds = tmp;
      this.newDepIds.clear();
      tmp = this.deps;
      this.deps = this.newDeps;
      this.newDeps = tmp;
      this.newDeps.length = 0;
    };
  
    /**
     * Subscriber interface.
     * Will be called when a dependency changes.
     *
     * @param {Boolean} shallow
     */
  
    Watcher.prototype.update = function (shallow) {
      if (this.lazy) {
        this.dirty = true;
      } else if (this.sync || !config.async) {
        this.run();
      } else {
        // if queued, only overwrite shallow with non-shallow,
        // but not the other way around.
        this.shallow = this.queued ? shallow ? this.shallow : false : !!shallow;
        this.queued = true;
        // record before-push error stack in debug mode
        /* istanbul ignore if */
        if ('development' !== 'production' && config.debug) {
          this.prevError = new Error('[vue] async stack trace');
        }
        pushWatcher(this);
      }
    };
  
    /**
     * Batcher job interface.
     * Will be called by the batcher.
     */
  
    Watcher.prototype.run = function () {
      if (this.active) {
        var value = this.get();
        if (value !== this.value ||
        // Deep watchers and watchers on Object/Arrays should fire even
        // when the value is the same, because the value may
        // have mutated; but only do so if this is a
        // non-shallow update (caused by a vm digest).
        (isObject(value) || this.deep) && !this.shallow) {
          // set new value
          var oldValue = this.value;
          this.value = value;
          // in debug + async mode, when a watcher callbacks
          // throws, we also throw the saved before-push error
          // so the full cross-tick stack trace is available.
          var prevError = this.prevError;
          /* istanbul ignore if */
          if ('development' !== 'production' && config.debug && prevError) {
            this.prevError = null;
            try {
              this.cb.call(this.vm, value, oldValue);
            } catch (e) {
              nextTick(function () {
                throw prevError;
              }, 0);
              throw e;
            }
          } else {
            this.cb.call(this.vm, value, oldValue);
          }
        }
        this.queued = this.shallow = false;
      }
    };
  
    /**
     * Evaluate the value of the watcher.
     * This only gets called for lazy watchers.
     */
  
    Watcher.prototype.evaluate = function () {
      // avoid overwriting another watcher that is being
      // collected.
      var current = Dep.target;
      this.value = this.get();
      this.dirty = false;
      Dep.target = current;
    };
  
    /**
     * Depend on all deps collected by this watcher.
     */
  
    Watcher.prototype.depend = function () {
      var i = this.deps.length;
      while (i--) {
        this.deps[i].depend();
      }
    };
  
    /**
     * Remove self from all dependencies' subcriber list.
     */
  
    Watcher.prototype.teardown = function () {
      if (this.active) {
        // remove self from vm's watcher list
        // this is a somewhat expensive operation so we skip it
        // if the vm is being destroyed or is performing a v-for
        // re-render (the watcher list is then filtered by v-for).
        if (!this.vm._isBeingDestroyed && !this.vm._vForRemoving) {
          this.vm._watchers.$remove(this);
        }
        var i = this.deps.length;
        while (i--) {
          this.deps[i].removeSub(this);
        }
        this.active = false;
        this.vm = this.cb = this.value = null;
      }
    };
  
    /**
     * Recrusively traverse an object to evoke all converted
     * getters, so that every nested property inside the object
     * is collected as a "deep" dependency.
     *
     * @param {*} val
     */
  
    var seenObjects = new _Set();
    function traverse(val, seen) {
      var i = undefined,
          keys = undefined;
      if (!seen) {
        seen = seenObjects;
        seen.clear();
      }
      var isA = isArray(val);
      var isO = isObject(val);
      if ((isA || isO) && Object.isExtensible(val)) {
        if (val.__ob__) {
          var depId = val.__ob__.dep.id;
          if (seen.has(depId)) {
            return;
          } else {
            seen.add(depId);
          }
        }
        if (isA) {
          i = val.length;
          while (i--) traverse(val[i], seen);
        } else if (isO) {
          keys = Object.keys(val);
          i = keys.length;
          while (i--) traverse(val[keys[i]], seen);
        }
      }
    }
  
    var text$1 = {
  
      bind: function bind() {
        this.attr = this.el.nodeType === 3 ? 'data' : 'textContent';
      },
  
      update: function update(value) {
        this.el[this.attr] = _toString(value);
      }
    };
  
    var templateCache = new Cache(1000);
    var idSelectorCache = new Cache(1000);
  
    var map = {
      efault: [0, '', ''],
      legend: [1, '<fieldset>', '</fieldset>'],
      tr: [2, '<table><tbody>', '</tbody></table>'],
      col: [2, '<table><tbody></tbody><colgroup>', '</colgroup></table>']
    };
  
    map.td = map.th = [3, '<table><tbody><tr>', '</tr></tbody></table>'];
  
    map.option = map.optgroup = [1, '<select multiple="multiple">', '</select>'];
  
    map.thead = map.tbody = map.colgroup = map.caption = map.tfoot = [1, '<table>', '</table>'];
  
    map.g = map.defs = map.symbol = map.use = map.image = map.text = map.circle = map.ellipse = map.line = map.path = map.polygon = map.polyline = map.rect = [1, '<svg ' + 'xmlns="http://www.w3.org/2000/svg" ' + 'xmlns:xlink="http://www.w3.org/1999/xlink" ' + 'xmlns:ev="http://www.w3.org/2001/xml-events"' + 'version="1.1">', '</svg>'];
  
    /**
     * Check if a node is a supported template node with a
     * DocumentFragment content.
     *
     * @param {Node} node
     * @return {Boolean}
     */
  
    function isRealTemplate(node) {
      return isTemplate(node) && isFragment(node.content);
    }
  
    var tagRE$1 = /<([\w:-]+)/;
    var entityRE = /&#?\w+?;/;
    var commentRE = /<!--/;
  
    /**
     * Convert a string template to a DocumentFragment.
     * Determines correct wrapping by tag types. Wrapping
     * strategy found in jQuery & component/domify.
     *
     * @param {String} templateString
     * @param {Boolean} raw
     * @return {DocumentFragment}
     */
  
    function stringToFragment(templateString, raw) {
      // try a cache hit first
      var cacheKey = raw ? templateString : templateString.trim();
      var hit = templateCache.get(cacheKey);
      if (hit) {
        return hit;
      }
  
      var frag = document.createDocumentFragment();
      var tagMatch = templateString.match(tagRE$1);
      var entityMatch = entityRE.test(templateString);
      var commentMatch = commentRE.test(templateString);
  
      if (!tagMatch && !entityMatch && !commentMatch) {
        // text only, return a single text node.
        frag.appendChild(document.createTextNode(templateString));
      } else {
        var tag = tagMatch && tagMatch[1];
        var wrap = map[tag] || map.efault;
        var depth = wrap[0];
        var prefix = wrap[1];
        var suffix = wrap[2];
        var node = document.createElement('div');
  
        node.innerHTML = prefix + templateString + suffix;
        while (depth--) {
          node = node.lastChild;
        }
  
        var child;
        /* eslint-disable no-cond-assign */
        while (child = node.firstChild) {
          /* eslint-enable no-cond-assign */
          frag.appendChild(child);
        }
      }
      if (!raw) {
        trimNode(frag);
      }
      templateCache.put(cacheKey, frag);
      return frag;
    }
  
    /**
     * Convert a template node to a DocumentFragment.
     *
     * @param {Node} node
     * @return {DocumentFragment}
     */
  
    function nodeToFragment(node) {
      // if its a template tag and the browser supports it,
      // its content is already a document fragment. However, iOS Safari has
      // bug when using directly cloned template content with touch
      // events and can cause crashes when the nodes are removed from DOM, so we
      // have to treat template elements as string templates. (#2805)
      /* istanbul ignore if */
      if (isRealTemplate(node)) {
        return stringToFragment(node.innerHTML);
      }
      // script template
      if (node.tagName === 'SCRIPT') {
        return stringToFragment(node.textContent);
      }
      // normal node, clone it to avoid mutating the original
      var clonedNode = cloneNode(node);
      var frag = document.createDocumentFragment();
      var child;
      /* eslint-disable no-cond-assign */
      while (child = clonedNode.firstChild) {
        /* eslint-enable no-cond-assign */
        frag.appendChild(child);
      }
      trimNode(frag);
      return frag;
    }
  
    // Test for the presence of the Safari template cloning bug
    // https://bugs.webkit.org/showug.cgi?id=137755
    var hasBrokenTemplate = (function () {
      /* istanbul ignore else */
      if (inBrowser) {
        var a = document.createElement('div');
        a.innerHTML = '<template>1</template>';
        return !a.cloneNode(true).firstChild.innerHTML;
      } else {
        return false;
      }
    })();
  
    // Test for IE10/11 textarea placeholder clone bug
    var hasTextareaCloneBug = (function () {
      /* istanbul ignore else */
      if (inBrowser) {
        var t = document.createElement('textarea');
        t.placeholder = 't';
        return t.cloneNode(true).value === 't';
      } else {
        return false;
      }
    })();
  
    /**
     * 1. Deal with Safari cloning nested <template> bug by
     *    manually cloning all template instances.
     * 2. Deal with IE10/11 textarea placeholder bug by setting
     *    the correct value after cloning.
     *
     * @param {Element|DocumentFragment} node
     * @return {Element|DocumentFragment}
     */
  
    function cloneNode(node) {
      /* istanbul ignore if */
      if (!node.querySelectorAll) {
        return node.cloneNode();
      }
      var res = node.cloneNode(true);
      var i, original, cloned;
      /* istanbul ignore if */
      if (hasBrokenTemplate) {
        var tempClone = res;
        if (isRealTemplate(node)) {
          node = node.content;
          tempClone = res.content;
        }
        original = node.querySelectorAll('template');
        if (original.length) {
          cloned = tempClone.querySelectorAll('template');
          i = cloned.length;
          while (i--) {
            cloned[i].parentNode.replaceChild(cloneNode(original[i]), cloned[i]);
          }
        }
      }
      /* istanbul ignore if */
      if (hasTextareaCloneBug) {
        if (node.tagName === 'TEXTAREA') {
          res.value = node.value;
        } else {
          original = node.querySelectorAll('textarea');
          if (original.length) {
            cloned = res.querySelectorAll('textarea');
            i = cloned.length;
            while (i--) {
              cloned[i].value = original[i].value;
            }
          }
        }
      }
      return res;
    }
  
    /**
     * Process the template option and normalizes it into a
     * a DocumentFragment that can be used as a partial or a
     * instance template.
     *
     * @param {*} template
     *        Possible values include:
     *        - DocumentFragment object
     *        - Node object of type Template
     *        - id selector: '#some-template-id'
     *        - template string: '<div><span>{{msg}}</span></div>'
     * @param {Boolean} shouldClone
     * @param {Boolean} raw
     *        inline HTML interpolation. Do not check for id
     *        selector and keep whitespace in the string.
     * @return {DocumentFragment|undefined}
     */
  
    function parseTemplate(template, shouldClone, raw) {
      var node, frag;
  
      // if the template is already a document fragment,
      // do nothing
      if (isFragment(template)) {
        trimNode(template);
        return shouldClone ? cloneNode(template) : template;
      }
  
      if (typeof template === 'string') {
        // id selector
        if (!raw && template.charAt(0) === '#') {
          // id selector can be cached too
          frag = idSelectorCache.get(template);
          if (!frag) {
            node = document.getElementById(template.slice(1));
            if (node) {
              frag = nodeToFragment(node);
              // save selector to cache
              idSelectorCache.put(template, frag);
            }
          }
        } else {
          // normal string template
          frag = stringToFragment(template, raw);
        }
      } else if (template.nodeType) {
        // a direct node
        frag = nodeToFragment(template);
      }
  
      return frag && shouldClone ? cloneNode(frag) : frag;
    }
  
  var template = Object.freeze({
      cloneNode: cloneNode,
      parseTemplate: parseTemplate
    });
  
    var html = {
  
      bind: function bind() {
        // a comment node means this is a binding for
        // {{{ inline unescaped html }}}
        if (this.el.nodeType === 8) {
          // hold nodes
          this.nodes = [];
          // replace the placeholder with proper anchor
          this.anchor = createAnchor('v-html');
          replace(this.el, this.anchor);
        }
      },
  
      update: function update(value) {
        value = _toString(value);
        if (this.nodes) {
          this.swap(value);
        } else {
          this.el.innerHTML = value;
        }
      },
  
      swap: function swap(value) {
        // remove old nodes
        var i = this.nodes.length;
        while (i--) {
          remove(this.nodes[i]);
        }
        // convert new value to a fragment
        // do not attempt to retrieve from id selector
        var frag = parseTemplate(value, true, true);
        // save a reference to these nodes so we can remove later
        this.nodes = toArray(frag.childNodes);
        before(frag, this.anchor);
      }
    };
  
    /**
     * Abstraction for a partially-compiled fragment.
     * Can optionally compile content with a child scope.
     *
     * @param {Function} linker
     * @param {Vue} vm
     * @param {DocumentFragment} frag
     * @param {Vue} [host]
     * @param {Object} [scope]
     * @param {Fragment} [parentFrag]
     */
    function Fragment(linker, vm, frag, host, scope, parentFrag) {
      this.children = [];
      this.childFrags = [];
      this.vm = vm;
      this.scope = scope;
      this.inserted = false;
      this.parentFrag = parentFrag;
      if (parentFrag) {
        parentFrag.childFrags.push(this);
      }
      this.unlink = linker(vm, frag, host, scope, this);
      var single = this.single = frag.childNodes.length === 1 &&
      // do not go single mode if the only node is an anchor
      !frag.childNodes[0].__v_anchor;
      if (single) {
        this.node = frag.childNodes[0];
        this.before = singleBefore;
        this.remove = singleRemove;
      } else {
        this.node = createAnchor('fragment-start');
        this.end = createAnchor('fragment-end');
        this.frag = frag;
        prepend(this.node, frag);
        frag.appendChild(this.end);
        this.before = multiBefore;
        this.remove = multiRemove;
      }
      this.node.__v_frag = this;
    }
  
    /**
     * Call attach/detach for all components contained within
     * this fragment. Also do so recursively for all child
     * fragments.
     *
     * @param {Function} hook
     */
  
    Fragment.prototype.callHook = function (hook) {
      var i, l;
      for (i = 0, l = this.childFrags.length; i < l; i++) {
        this.childFrags[i].callHook(hook);
      }
      for (i = 0, l = this.children.length; i < l; i++) {
        hook(this.children[i]);
      }
    };
  
    /**
     * Insert fragment before target, single node version
     *
     * @param {Node} target
     * @param {Boolean} withTransition
     */
  
    function singleBefore(target, withTransition) {
      this.inserted = true;
      var method = withTransition !== false ? beforeWithTransition : before;
      method(this.node, target, this.vm);
      if (inDoc(this.node)) {
        this.callHook(attach);
      }
    }
  
    /**
     * Remove fragment, single node version
     */
  
    function singleRemove() {
      this.inserted = false;
      var shouldCallRemove = inDoc(this.node);
      var self = this;
      this.beforeRemove();
      removeWithTransition(this.node, this.vm, function () {
        if (shouldCallRemove) {
          self.callHook(detach);
        }
        self.destroy();
      });
    }
  
    /**
     * Insert fragment before target, multi-nodes version
     *
     * @param {Node} target
     * @param {Boolean} withTransition
     */
  
    function multiBefore(target, withTransition) {
      this.inserted = true;
      var vm = this.vm;
      var method = withTransition !== false ? beforeWithTransition : before;
      mapNodeRange(this.node, this.end, function (node) {
        method(node, target, vm);
      });
      if (inDoc(this.node)) {
        this.callHook(attach);
      }
    }
  
    /**
     * Remove fragment, multi-nodes version
     */
  
    function multiRemove() {
      this.inserted = false;
      var self = this;
      var shouldCallRemove = inDoc(this.node);
      this.beforeRemove();
      removeNodeRange(this.node, this.end, this.vm, this.frag, function () {
        if (shouldCallRemove) {
          self.callHook(detach);
        }
        self.destroy();
      });
    }
  
    /**
     * Prepare the fragment for removal.
     */
  
    Fragment.prototype.beforeRemove = function () {
      var i, l;
      for (i = 0, l = this.childFrags.length; i < l; i++) {
        // call the same method recursively on child
        // fragments, depth-first
        this.childFrags[i].beforeRemove(false);
      }
      for (i = 0, l = this.children.length; i < l; i++) {
        // Call destroy for all contained instances,
        // with remove:false and defer:true.
        // Defer is necessary because we need to
        // keep the children to call detach hooks
        // on them.
        this.children[i].$destroy(false, true);
      }
      var dirs = this.unlink.dirs;
      for (i = 0, l = dirs.length; i < l; i++) {
        // disable the watchers on all the directives
        // so that the rendered content stays the same
        // during removal.
        dirs[i]._watcher && dirs[i]._watcher.teardown();
      }
    };
  
    /**
     * Destroy the fragment.
     */
  
    Fragment.prototype.destroy = function () {
      if (this.parentFrag) {
        this.parentFrag.childFrags.$remove(this);
      }
      this.node.__v_frag = null;
      this.unlink();
    };
  
    /**
     * Call attach hook for a Vue instance.
     *
     * @param {Vue} child
     */
  
    function attach(child) {
      if (!child._isAttached && inDoc(child.$el)) {
        child._callHook('attached');
      }
    }
  
    /**
     * Call detach hook for a Vue instance.
     *
     * @param {Vue} child
     */
  
    function detach(child) {
      if (child._isAttached && !inDoc(child.$el)) {
        child._callHook('detached');
      }
    }
  
    var linkerCache = new Cache(5000);
  
    /**
     * A factory that can be used to create instances of a
     * fragment. Caches the compiled linker if possible.
     *
     * @param {Vue} vm
     * @param {Element|String} el
     */
    function FragmentFactory(vm, el) {
      this.vm = vm;
      var template;
      var isString = typeof el === 'string';
      if (isString || isTemplate(el) && !el.hasAttribute('v-if')) {
        template = parseTemplate(el, true);
      } else {
        template = document.createDocumentFragment();
        template.appendChild(el);
      }
      this.template = template;
      // linker can be cached, but only for components
      var linker;
      var cid = vm.constructor.cid;
      if (cid > 0) {
        var cacheId = cid + (isString ? el : getOuterHTML(el));
        linker = linkerCache.get(cacheId);
        if (!linker) {
          linker = compile(template, vm.$options, true);
          linkerCache.put(cacheId, linker);
        }
      } else {
        linker = compile(template, vm.$options, true);
      }
      this.linker = linker;
    }
  
    /**
     * Create a fragment instance with given host and scope.
     *
     * @param {Vue} host
     * @param {Object} scope
     * @param {Fragment} parentFrag
     */
  
    FragmentFactory.prototype.create = function (host, scope, parentFrag) {
      var frag = cloneNode(this.template);
      return new Fragment(this.linker, this.vm, frag, host, scope, parentFrag);
    };
  
    var ON = 700;
    var MODEL = 800;
    var BIND = 850;
    var TRANSITION = 1100;
    var EL = 1500;
    var COMPONENT = 1500;
    var PARTIAL = 1750;
    var IF = 2100;
    var FOR = 2200;
    var SLOT = 2300;
  
    var uid$3 = 0;
  
    var vFor = {
  
      priority: FOR,
      terminal: true,
  
      params: ['track-by', 'stagger', 'enter-stagger', 'leave-stagger'],
  
      bind: function bind() {
        // support "item in/of items" syntax
        var inMatch = this.expression.match(/(.*) (?:in|of) (.*)/);
        if (inMatch) {
          var itMatch = inMatch[1].match(/\((.*),(.*)\)/);
          if (itMatch) {
            this.iterator = itMatch[1].trim();
            this.alias = itMatch[2].trim();
          } else {
            this.alias = inMatch[1].trim();
          }
          this.expression = inMatch[2];
        }
  
        if (!this.alias) {
          'development' !== 'production' && warn('Invalid v-for expression "' + this.descriptor.raw + '": ' + 'alias is required.', this.vm);
          return;
        }
  
        // uid as a cache identifier
        this.id = '__v-for__' + ++uid$3;
  
        // check if this is an option list,
        // so that we know if we need to update the <select>'s
        // v-model when the option list has changed.
        // because v-model has a lower priority than v-for,
        // the v-model is not bound here yet, so we have to
        // retrive it in the actual updateModel() function.
        var tag = this.el.tagName;
        this.isOption = (tag === 'OPTION' || tag === 'OPTGROUP') && this.el.parentNode.tagName === 'SELECT';
  
        // setup anchor nodes
        this.start = createAnchor('v-for-start');
        this.end = createAnchor('v-for-end');
        replace(this.el, this.end);
        before(this.start, this.end);
  
        // cache
        this.cache = Object.create(null);
  
        // fragment factory
        this.factory = new FragmentFactory(this.vm, this.el);
      },
  
      update: function update(data) {
        this.diff(data);
        this.updateRef();
        this.updateModel();
      },
  
      /**
       * Diff, based on new data and old data, determine the
       * minimum amount of DOM manipulations needed to make the
       * DOM reflect the new data Array.
       *
       * The algorithm diffs the new data Array by storing a
       * hidden reference to an owner vm instance on previously
       * seen data. This allows us to achieve O(n) which is
       * better than a levenshtein distance based algorithm,
       * which is O(m * n).
       *
       * @param {Array} data
       */
  
      diff: function diff(data) {
        // check if the Array was converted from an Object
        var item = data[0];
        var convertedFromObject = this.fromObject = isObject(item) && hasOwn(item, '$key') && hasOwn(item, '$value');
  
        var trackByKey = this.params.trackBy;
        var oldFrags = this.frags;
        var frags = this.frags = new Array(data.length);
        var alias = this.alias;
        var iterator = this.iterator;
        var start = this.start;
        var end = this.end;
        var inDocument = inDoc(start);
        var init = !oldFrags;
        var i, l, frag, key, value, primitive;
  
        // First pass, go through the new Array and fill up
        // the new frags array. If a piece of data has a cached
        // instance for it, we reuse it. Otherwise build a new
        // instance.
        for (i = 0, l = data.length; i < l; i++) {
          item = data[i];
          key = convertedFromObject ? item.$key : null;
          value = convertedFromObject ? item.$value : item;
          primitive = !isObject(value);
          frag = !init && this.getCachedFrag(value, i, key);
          if (frag) {
            // reusable fragment
            frag.reused = true;
            // update $index
            frag.scope.$index = i;
            // update $key
            if (key) {
              frag.scope.$key = key;
            }
            // update iterator
            if (iterator) {
              frag.scope[iterator] = key !== null ? key : i;
            }
            // update data for track-by, object repeat &
            // primitive values.
            if (trackByKey || convertedFromObject || primitive) {
              withoutConversion(function () {
                frag.scope[alias] = value;
              });
            }
          } else {
            // new isntance
            frag = this.create(value, alias, i, key);
            frag.fresh = !init;
          }
          frags[i] = frag;
          if (init) {
            frag.before(end);
          }
        }
  
        // we're done for the initial render.
        if (init) {
          return;
        }
  
        // Second pass, go through the old fragments and
        // destroy those who are not reused (and remove them
        // from cache)
        var removalIndex = 0;
        var totalRemoved = oldFrags.length - frags.length;
        // when removing a large number of fragments, watcher removal
        // turns out to be a perf bottleneck, so we batch the watcher
        // removals into a single filter call!
        this.vm._vForRemoving = true;
        for (i = 0, l = oldFrags.length; i < l; i++) {
          frag = oldFrags[i];
          if (!frag.reused) {
            this.deleteCachedFrag(frag);
            this.remove(frag, removalIndex++, totalRemoved, inDocument);
          }
        }
        this.vm._vForRemoving = false;
        if (removalIndex) {
          this.vm._watchers = this.vm._watchers.filter(function (w) {
            return w.active;
          });
        }
  
        // Final pass, move/insert new fragments into the
        // right place.
        var targetPrev, prevEl, currentPrev;
        var insertionIndex = 0;
        for (i = 0, l = frags.length; i < l; i++) {
          frag = frags[i];
          // this is the frag that we should be after
          targetPrev = frags[i - 1];
          prevEl = targetPrev ? targetPrev.staggerCb ? targetPrev.staggerAnchor : targetPrev.end || targetPrev.node : start;
          if (frag.reused && !frag.staggerCb) {
            currentPrev = findPrevFrag(frag, start, this.id);
            if (currentPrev !== targetPrev && (!currentPrev ||
            // optimization for moving a single item.
            // thanks to suggestions by @livoras in #1807
            findPrevFrag(currentPrev, start, this.id) !== targetPrev)) {
              this.move(frag, prevEl);
            }
          } else {
            // new instance, or still in stagger.
            // insert with updated stagger index.
            this.insert(frag, insertionIndex++, prevEl, inDocument);
          }
          frag.reused = frag.fresh = false;
        }
      },
  
      /**
       * Create a new fragment instance.
       *
       * @param {*} value
       * @param {String} alias
       * @param {Number} index
       * @param {String} [key]
       * @return {Fragment}
       */
  
      create: function create(value, alias, index, key) {
        var host = this._host;
        // create iteration scope
        var parentScope = this._scope || this.vm;
        var scope = Object.create(parentScope);
        // ref holder for the scope
        scope.$refs = Object.create(parentScope.$refs);
        scope.$els = Object.create(parentScope.$els);
        // make sure point $parent to parent scope
        scope.$parent = parentScope;
        // for two-way binding on alias
        scope.$forContext = this;
        // define scope properties
        // important: define the scope alias without forced conversion
        // so that frozen data structures remain non-reactive.
        withoutConversion(function () {
          defineReactive(scope, alias, value);
        });
        defineReactive(scope, '$index', index);
        if (key) {
          defineReactive(scope, '$key', key);
        } else if (scope.$key) {
          // avoid accidental fallback
          def(scope, '$key', null);
        }
        if (this.iterator) {
          defineReactive(scope, this.iterator, key !== null ? key : index);
        }
        var frag = this.factory.create(host, scope, this._frag);
        frag.forId = this.id;
        this.cacheFrag(value, frag, index, key);
        return frag;
      },
  
      /**
       * Update the v-ref on owner vm.
       */
  
      updateRef: function updateRef() {
        var ref = this.descriptor.ref;
        if (!ref) return;
        var hash = (this._scope || this.vm).$refs;
        var refs;
        if (!this.fromObject) {
          refs = this.frags.map(findVmFromFrag);
        } else {
          refs = {};
          this.frags.forEach(function (frag) {
            refs[frag.scope.$key] = findVmFromFrag(frag);
          });
        }
        hash[ref] = refs;
      },
  
      /**
       * For option lists, update the containing v-model on
       * parent <select>.
       */
  
      updateModel: function updateModel() {
        if (this.isOption) {
          var parent = this.start.parentNode;
          var model = parent && parent.__v_model;
          if (model) {
            model.forceUpdate();
          }
        }
      },
  
      /**
       * Insert a fragment. Handles staggering.
       *
       * @param {Fragment} frag
       * @param {Number} index
       * @param {Node} prevEl
       * @param {Boolean} inDocument
       */
  
      insert: function insert(frag, index, prevEl, inDocument) {
        if (frag.staggerCb) {
          frag.staggerCb.cancel();
          frag.staggerCb = null;
        }
        var staggerAmount = this.getStagger(frag, index, null, 'enter');
        if (inDocument && staggerAmount) {
          // create an anchor and insert it synchronously,
          // so that we can resolve the correct order without
          // worrying about some elements not inserted yet
          var anchor = frag.staggerAnchor;
          if (!anchor) {
            anchor = frag.staggerAnchor = createAnchor('stagger-anchor');
            anchor.__v_frag = frag;
          }
          after(anchor, prevEl);
          var op = frag.staggerCb = cancellable(function () {
            frag.staggerCb = null;
            frag.before(anchor);
            remove(anchor);
          });
          setTimeout(op, staggerAmount);
        } else {
          var target = prevEl.nextSibling;
          /* istanbul ignore if */
          if (!target) {
            // reset end anchor position in case the position was messed up
            // by an external drag-n-drop library.
            after(this.end, prevEl);
            target = this.end;
          }
          frag.before(target);
        }
      },
  
      /**
       * Remove a fragment. Handles staggering.
       *
       * @param {Fragment} frag
       * @param {Number} index
       * @param {Number} total
       * @param {Boolean} inDocument
       */
  
      remove: function remove(frag, index, total, inDocument) {
        if (frag.staggerCb) {
          frag.staggerCb.cancel();
          frag.staggerCb = null;
          // it's not possible for the same frag to be removed
          // twice, so if we have a pending stagger callback,
          // it means this frag is queued for enter but removed
          // before its transition started. Since it is already
          // destroyed, we can just leave it in detached state.
          return;
        }
        var staggerAmount = this.getStagger(frag, index, total, 'leave');
        if (inDocument && staggerAmount) {
          var op = frag.staggerCb = cancellable(function () {
            frag.staggerCb = null;
            frag.remove();
          });
          setTimeout(op, staggerAmount);
        } else {
          frag.remove();
        }
      },
  
      /**
       * Move a fragment to a new position.
       * Force no transition.
       *
       * @param {Fragment} frag
       * @param {Node} prevEl
       */
  
      move: function move(frag, prevEl) {
        // fix a common issue with Sortable:
        // if prevEl doesn't have nextSibling, this means it's
        // been dragged after the end anchor. Just re-position
        // the end anchor to the end of the container.
        /* istanbul ignore if */
        if (!prevEl.nextSibling) {
          this.end.parentNode.appendChild(this.end);
        }
        frag.before(prevEl.nextSibling, false);
      },
  
      /**
       * Cache a fragment using track-by or the object key.
       *
       * @param {*} value
       * @param {Fragment} frag
       * @param {Number} index
       * @param {String} [key]
       */
  
      cacheFrag: function cacheFrag(value, frag, index, key) {
        var trackByKey = this.params.trackBy;
        var cache = this.cache;
        var primitive = !isObject(value);
        var id;
        if (key || trackByKey || primitive) {
          id = getTrackByKey(index, key, value, trackByKey);
          if (!cache[id]) {
            cache[id] = frag;
          } else if (trackByKey !== '$index') {
            'development' !== 'production' && this.warnDuplicate(value);
          }
        } else {
          id = this.id;
          if (hasOwn(value, id)) {
            if (value[id] === null) {
              value[id] = frag;
            } else {
              'development' !== 'production' && this.warnDuplicate(value);
            }
          } else if (Object.isExtensible(value)) {
            def(value, id, frag);
          } else if ('development' !== 'production') {
            warn('Frozen v-for objects cannot be automatically tracked, make sure to ' + 'provide a track-by key.');
          }
        }
        frag.raw = value;
      },
  
      /**
       * Get a cached fragment from the value/index/key
       *
       * @param {*} value
       * @param {Number} index
       * @param {String} key
       * @return {Fragment}
       */
  
      getCachedFrag: function getCachedFrag(value, index, key) {
        var trackByKey = this.params.trackBy;
        var primitive = !isObject(value);
        var frag;
        if (key || trackByKey || primitive) {
          var id = getTrackByKey(index, key, value, trackByKey);
          frag = this.cache[id];
        } else {
          frag = value[this.id];
        }
        if (frag && (frag.reused || frag.fresh)) {
          'development' !== 'production' && this.warnDuplicate(value);
        }
        return frag;
      },
  
      /**
       * Delete a fragment from cache.
       *
       * @param {Fragment} frag
       */
  
      deleteCachedFrag: function deleteCachedFrag(frag) {
        var value = frag.raw;
        var trackByKey = this.params.trackBy;
        var scope = frag.scope;
        var index = scope.$index;
        // fix #948: avoid accidentally fall through to
        // a parent repeater which happens to have $key.
        var key = hasOwn(scope, '$key') && scope.$key;
        var primitive = !isObject(value);
        if (trackByKey || key || primitive) {
          var id = getTrackByKey(index, key, value, trackByKey);
          this.cache[id] = null;
        } else {
          value[this.id] = null;
          frag.raw = null;
        }
      },
  
      /**
       * Get the stagger amount for an insertion/removal.
       *
       * @param {Fragment} frag
       * @param {Number} index
       * @param {Number} total
       * @param {String} type
       */
  
      getStagger: function getStagger(frag, index, total, type) {
        type = type + 'Stagger';
        var trans = frag.node.__v_trans;
        var hooks = trans && trans.hooks;
        var hook = hooks && (hooks[type] || hooks.stagger);
        return hook ? hook.call(frag, index, total) : index * parseInt(this.params[type] || this.params.stagger, 10);
      },
  
      /**
       * Pre-process the value before piping it through the
       * filters. This is passed to and called by the watcher.
       */
  
      _preProcess: function _preProcess(value) {
        // regardless of type, store the un-filtered raw value.
        this.rawValue = value;
        return value;
      },
  
      /**
       * Post-process the value after it has been piped through
       * the filters. This is passed to and called by the watcher.
       *
       * It is necessary for this to be called during the
       * watcher's dependency collection phase because we want
       * the v-for to update when the source Object is mutated.
       */
  
      _postProcess: function _postProcess(value) {
        if (isArray(value)) {
          return value;
        } else if (isPlainObject(value)) {
          // convert plain object to array.
          var keys = Object.keys(value);
          var i = keys.length;
          var res = new Array(i);
          var key;
          while (i--) {
            key = keys[i];
            res[i] = {
              $key: key,
              $value: value[key]
            };
          }
          return res;
        } else {
          if (typeof value === 'number' && !isNaN(value)) {
            value = range(value);
          }
          return value || [];
        }
      },
  
      unbind: function unbind() {
        if (this.descriptor.ref) {
          (this._scope || this.vm).$refs[this.descriptor.ref] = null;
        }
        if (this.frags) {
          var i = this.frags.length;
          var frag;
          while (i--) {
            frag = this.frags[i];
            this.deleteCachedFrag(frag);
            frag.destroy();
          }
        }
      }
    };
  
    /**
     * Helper to find the previous element that is a fragment
     * anchor. This is necessary because a destroyed frag's
     * element could still be lingering in the DOM before its
     * leaving transition finishes, but its inserted flag
     * should have been set to false so we can skip them.
     *
     * If this is a block repeat, we want to make sure we only
     * return frag that is bound to this v-for. (see #929)
     *
     * @param {Fragment} frag
     * @param {Comment|Text} anchor
     * @param {String} id
     * @return {Fragment}
     */
  
    function findPrevFrag(frag, anchor, id) {
      var el = frag.node.previousSibling;
      /* istanbul ignore if */
      if (!el) return;
      frag = el.__v_frag;
      while ((!frag || frag.forId !== id || !frag.inserted) && el !== anchor) {
        el = el.previousSibling;
        /* istanbul ignore if */
        if (!el) return;
        frag = el.__v_frag;
      }
      return frag;
    }
  
    /**
     * Find a vm from a fragment.
     *
     * @param {Fragment} frag
     * @return {Vue|undefined}
     */
  
    function findVmFromFrag(frag) {
      var node = frag.node;
      // handle multi-node frag
      if (frag.end) {
        while (!node.__vue__ && node !== frag.end && node.nextSibling) {
          node = node.nextSibling;
        }
      }
      return node.__vue__;
    }
  
    /**
     * Create a range array from given number.
     *
     * @param {Number} n
     * @return {Array}
     */
  
    function range(n) {
      var i = -1;
      var ret = new Array(Math.floor(n));
      while (++i < n) {
        ret[i] = i;
      }
      return ret;
    }
  
    /**
     * Get the track by key for an item.
     *
     * @param {Number} index
     * @param {String} key
     * @param {*} value
     * @param {String} [trackByKey]
     */
  
    function getTrackByKey(index, key, value, trackByKey) {
      return trackByKey ? trackByKey === '$index' ? index : trackByKey.charAt(0).match(/\w/) ? getPath(value, trackByKey) : value[trackByKey] : key || value;
    }
  
    if ('development' !== 'production') {
      vFor.warnDuplicate = function (value) {
        warn('Duplicate value found in v-for="' + this.descriptor.raw + '": ' + JSON.stringify(value) + '. Use track-by="$index" if ' + 'you are expecting duplicate values.', this.vm);
      };
    }
  
    var vIf = {
  
      priority: IF,
      terminal: true,
  
      bind: function bind() {
        var el = this.el;
        if (!el.__vue__) {
          // check else block
          var next = el.nextElementSibling;
          if (next && getAttr(next, 'v-else') !== null) {
            remove(next);
            this.elseEl = next;
          }
          // check main block
          this.anchor = createAnchor('v-if');
          replace(el, this.anchor);
        } else {
          'development' !== 'production' && warn('v-if="' + this.expression + '" cannot be ' + 'used on an instance root element.', this.vm);
          this.invalid = true;
        }
      },
  
      update: function update(value) {
        if (this.invalid) return;
        if (value) {
          if (!this.frag) {
            this.insert();
          }
        } else {
          this.remove();
        }
      },
  
      insert: function insert() {
        if (this.elseFrag) {
          this.elseFrag.remove();
          this.elseFrag = null;
        }
        // lazy init factory
        if (!this.factory) {
          this.factory = new FragmentFactory(this.vm, this.el);
        }
        this.frag = this.factory.create(this._host, this._scope, this._frag);
        this.frag.before(this.anchor);
      },
  
      remove: function remove() {
        if (this.frag) {
          this.frag.remove();
          this.frag = null;
        }
        if (this.elseEl && !this.elseFrag) {
          if (!this.elseFactory) {
            this.elseFactory = new FragmentFactory(this.elseEl._context || this.vm, this.elseEl);
          }
          this.elseFrag = this.elseFactory.create(this._host, this._scope, this._frag);
          this.elseFrag.before(this.anchor);
        }
      },
  
      unbind: function unbind() {
        if (this.frag) {
          this.frag.destroy();
        }
        if (this.elseFrag) {
          this.elseFrag.destroy();
        }
      }
    };
  
    var show = {
  
      bind: function bind() {
        // check else block
        var next = this.el.nextElementSibling;
        if (next && getAttr(next, 'v-else') !== null) {
          this.elseEl = next;
        }
      },
  
      update: function update(value) {
        this.apply(this.el, value);
        if (this.elseEl) {
          this.apply(this.elseEl, !value);
        }
      },
  
      apply: function apply(el, value) {
        if (inDoc(el)) {
          applyTransition(el, value ? 1 : -1, toggle, this.vm);
        } else {
          toggle();
        }
        function toggle() {
          el.style.display = value ? '' : 'none';
        }
      }
    };
  
    var text$2 = {
  
      bind: function bind() {
        var self = this;
        var el = this.el;
        var isRange = el.type === 'range';
        var lazy = this.params.lazy;
        var number = this.params.number;
        var debounce = this.params.debounce;
  
        // handle composition events.
        //   http://blog.evanyou.me/2014/01/03/composition-event/
        // skip this for Android because it handles composition
        // events quite differently. Android doesn't trigger
        // composition events for language input methods e.g.
        // Chinese, but instead triggers them for spelling
        // suggestions... (see Discussion/#162)
        var composing = false;
        if (!isAndroid && !isRange) {
          this.on('compositionstart', function () {
            composing = true;
          });
          this.on('compositionend', function () {
            composing = false;
            // in IE11 the "compositionend" event fires AFTER
            // the "input" event, so the input handler is blocked
            // at the end... have to call it here.
            //
            // #1327: in lazy mode this is unecessary.
            if (!lazy) {
              self.listener();
            }
          });
        }
  
        // prevent messing with the input when user is typing,
        // and force update on blur.
        this.focused = false;
        if (!isRange && !lazy) {
          this.on('focus', function () {
            self.focused = true;
          });
          this.on('blur', function () {
            self.focused = false;
            // do not sync value after fragment removal (#2017)
            if (!self._frag || self._frag.inserted) {
              self.rawListener();
            }
          });
        }
  
        // Now attach the main listener
        this.listener = this.rawListener = function () {
          if (composing || !self._bound) {
            return;
          }
          var val = number || isRange ? toNumber(el.value) : el.value;
          self.set(val);
          // force update on next tick to avoid lock & same value
          // also only update when user is not typing
          nextTick(function () {
            if (self._bound && !self.focused) {
              self.update(self._watcher.value);
            }
          });
        };
  
        // apply debounce
        if (debounce) {
          this.listener = _debounce(this.listener, debounce);
        }
  
        // Support jQuery events, since jQuery.trigger() doesn't
        // trigger native events in some cases and some plugins
        // rely on $.trigger()
        //
        // We want to make sure if a listener is attached using
        // jQuery, it is also removed with jQuery, that's why
        // we do the check for each directive instance and
        // store that check result on itself. This also allows
        // easier test coverage control by unsetting the global
        // jQuery variable in tests.
        this.hasjQuery = typeof jQuery === 'function';
        if (this.hasjQuery) {
          var method = jQuery.fn.on ? 'on' : 'bind';
          jQuery(el)[method]('change', this.rawListener);
          if (!lazy) {
            jQuery(el)[method]('input', this.listener);
          }
        } else {
          this.on('change', this.rawListener);
          if (!lazy) {
            this.on('input', this.listener);
          }
        }
  
        // IE9 doesn't fire input event on backspace/del/cut
        if (!lazy && isIE9) {
          this.on('cut', function () {
            nextTick(self.listener);
          });
          this.on('keyup', function (e) {
            if (e.keyCode === 46 || e.keyCode === 8) {
              self.listener();
            }
          });
        }
  
        // set initial value if present
        if (el.hasAttribute('value') || el.tagName === 'TEXTAREA' && el.value.trim()) {
          this.afterBind = this.listener;
        }
      },
  
      update: function update(value) {
        // #3029 only update when the value changes. This prevent
        // browsers from overwriting values like selectionStart
        value = _toString(value);
        if (value !== this.el.value) this.el.value = value;
      },
  
      unbind: function unbind() {
        var el = this.el;
        if (this.hasjQuery) {
          var method = jQuery.fn.off ? 'off' : 'unbind';
          jQuery(el)[method]('change', this.listener);
          jQuery(el)[method]('input', this.listener);
        }
      }
    };
  
    var radio = {
  
      bind: function bind() {
        var self = this;
        var el = this.el;
  
        this.getValue = function () {
          // value overwrite via v-bind:value
          if (el.hasOwnProperty('_value')) {
            return el._value;
          }
          var val = el.value;
          if (self.params.number) {
            val = toNumber(val);
          }
          return val;
        };
  
        this.listener = function () {
          self.set(self.getValue());
        };
        this.on('change', this.listener);
  
        if (el.hasAttribute('checked')) {
          this.afterBind = this.listener;
        }
      },
  
      update: function update(value) {
        this.el.checked = looseEqual(value, this.getValue());
      }
    };
  
    var select = {
  
      bind: function bind() {
        var _this = this;
  
        var self = this;
        var el = this.el;
  
        // method to force update DOM using latest value.
        this.forceUpdate = function () {
          if (self._watcher) {
            self.update(self._watcher.get());
          }
        };
  
        // check if this is a multiple select
        var multiple = this.multiple = el.hasAttribute('multiple');
  
        // attach listener
        this.listener = function () {
          var value = getValue(el, multiple);
          value = self.params.number ? isArray(value) ? value.map(toNumber) : toNumber(value) : value;
          self.set(value);
        };
        this.on('change', this.listener);
  
        // if has initial value, set afterBind
        var initValue = getValue(el, multiple, true);
        if (multiple && initValue.length || !multiple && initValue !== null) {
          this.afterBind = this.listener;
        }
  
        // All major browsers except Firefox resets
        // selectedIndex with value -1 to 0 when the element
        // is appended to a new parent, therefore we have to
        // force a DOM update whenever that happens...
        this.vm.$on('hook:attached', function () {
          nextTick(_this.forceUpdate);
        });
        if (!inDoc(el)) {
          nextTick(this.forceUpdate);
        }
      },
  
      update: function update(value) {
        var el = this.el;
        el.selectedIndex = -1;
        var multi = this.multiple && isArray(value);
        var options = el.options;
        var i = options.length;
        var op, val;
        while (i--) {
          op = options[i];
          val = op.hasOwnProperty('_value') ? op._value : op.value;
          /* eslint-disable eqeqeq */
          op.selected = multi ? indexOf$1(value, val) > -1 : looseEqual(value, val);
          /* eslint-enable eqeqeq */
        }
      },
  
      unbind: function unbind() {
        /* istanbul ignore next */
        this.vm.$off('hook:attached', this.forceUpdate);
      }
    };
  
    /**
     * Get select value
     *
     * @param {SelectElement} el
     * @param {Boolean} multi
     * @param {Boolean} init
     * @return {Array|*}
     */
  
    function getValue(el, multi, init) {
      var res = multi ? [] : null;
      var op, val, selected;
      for (var i = 0, l = el.options.length; i < l; i++) {
        op = el.options[i];
        selected = init ? op.hasAttribute('selected') : op.selected;
        if (selected) {
          val = op.hasOwnProperty('_value') ? op._value : op.value;
          if (multi) {
            res.push(val);
          } else {
            return val;
          }
        }
      }
      return res;
    }
  
    /**
     * Native Array.indexOf uses strict equal, but in this
     * case we need to match string/numbers with custom equal.
     *
     * @param {Array} arr
     * @param {*} val
     */
  
    function indexOf$1(arr, val) {
      var i = arr.length;
      while (i--) {
        if (looseEqual(arr[i], val)) {
          return i;
        }
      }
      return -1;
    }
  
    var checkbox = {
  
      bind: function bind() {
        var self = this;
        var el = this.el;
  
        this.getValue = function () {
          return el.hasOwnProperty('_value') ? el._value : self.params.number ? toNumber(el.value) : el.value;
        };
  
        function getBooleanValue() {
          var val = el.checked;
          if (val && el.hasOwnProperty('_trueValue')) {
            return el._trueValue;
          }
          if (!val && el.hasOwnProperty('_falseValue')) {
            return el._falseValue;
          }
          return val;
        }
  
        this.listener = function () {
          var model = self._watcher.value;
          if (isArray(model)) {
            var val = self.getValue();
            if (el.checked) {
              if (indexOf(model, val) < 0) {
                model.push(val);
              }
            } else {
              model.$remove(val);
            }
          } else {
            self.set(getBooleanValue());
          }
        };
  
        this.on('change', this.listener);
        if (el.hasAttribute('checked')) {
          this.afterBind = this.listener;
        }
      },
  
      update: function update(value) {
        var el = this.el;
        if (isArray(value)) {
          el.checked = indexOf(value, this.getValue()) > -1;
        } else {
          if (el.hasOwnProperty('_trueValue')) {
            el.checked = looseEqual(value, el._trueValue);
          } else {
            el.checked = !!value;
          }
        }
      }
    };
  
    var handlers = {
      text: text$2,
      radio: radio,
      select: select,
      checkbox: checkbox
    };
  
    var model = {
  
      priority: MODEL,
      twoWay: true,
      handlers: handlers,
      params: ['lazy', 'number', 'debounce'],
  
      /**
       * Possible elements:
       *   <select>
       *   <textarea>
       *   <input type="*">
       *     - text
       *     - checkbox
       *     - radio
       *     - number
       */
  
      bind: function bind() {
        // friendly warning...
        this.checkFilters();
        if (this.hasRead && !this.hasWrite) {
          'development' !== 'production' && warn('It seems you are using a read-only filter with ' + 'v-model="' + this.descriptor.raw + '". ' + 'You might want to use a two-way filter to ensure correct behavior.', this.vm);
        }
        var el = this.el;
        var tag = el.tagName;
        var handler;
        if (tag === 'INPUT') {
          handler = handlers[el.type] || handlers.text;
        } else if (tag === 'SELECT') {
          handler = handlers.select;
        } else if (tag === 'TEXTAREA') {
          handler = handlers.text;
        } else {
          'development' !== 'production' && warn('v-model does not support element type: ' + tag, this.vm);
          return;
        }
        el.__v_model = this;
        handler.bind.call(this);
        this.update = handler.update;
        this._unbind = handler.unbind;
      },
  
      /**
       * Check read/write filter stats.
       */
  
      checkFilters: function checkFilters() {
        var filters = this.filters;
        if (!filters) return;
        var i = filters.length;
        while (i--) {
          var filter = resolveAsset(this.vm.$options, 'filters', filters[i].name);
          if (typeof filter === 'function' || filter.read) {
            this.hasRead = true;
          }
          if (filter.write) {
            this.hasWrite = true;
          }
        }
      },
  
      unbind: function unbind() {
        this.el.__v_model = null;
        this._unbind && this._unbind();
      }
    };
  
    // keyCode aliases
    var keyCodes = {
      esc: 27,
      tab: 9,
      enter: 13,
      space: 32,
      'delete': [8, 46],
      up: 38,
      left: 37,
      right: 39,
      down: 40
    };
  
    function keyFilter(handler, keys) {
      var codes = keys.map(function (key) {
        var charCode = key.charCodeAt(0);
        if (charCode > 47 && charCode < 58) {
          return parseInt(key, 10);
        }
        if (key.length === 1) {
          charCode = key.toUpperCase().charCodeAt(0);
          if (charCode > 64 && charCode < 91) {
            return charCode;
          }
        }
        return keyCodes[key];
      });
      codes = [].concat.apply([], codes);
      return function keyHandler(e) {
        if (codes.indexOf(e.keyCode) > -1) {
          return handler.call(this, e);
        }
      };
    }
  
    function stopFilter(handler) {
      return function stopHandler(e) {
        e.stopPropagation();
        return handler.call(this, e);
      };
    }
  
    function preventFilter(handler) {
      return function preventHandler(e) {
        e.preventDefault();
        return handler.call(this, e);
      };
    }
  
    function selfFilter(handler) {
      return function selfHandler(e) {
        if (e.target === e.currentTarget) {
          return handler.call(this, e);
        }
      };
    }
  
    var on$1 = {
  
      priority: ON,
      acceptStatement: true,
      keyCodes: keyCodes,
  
      bind: function bind() {
        // deal with iframes
        if (this.el.tagName === 'IFRAME' && this.arg !== 'load') {
          var self = this;
          this.iframeBind = function () {
            on(self.el.contentWindow, self.arg, self.handler, self.modifiers.capture);
          };
          this.on('load', this.iframeBind);
        }
      },
  
      update: function update(handler) {
        // stub a noop for v-on with no value,
        // e.g. @mousedown.prevent
        if (!this.descriptor.raw) {
          handler = function () {};
        }
  
        if (typeof handler !== 'function') {
          'development' !== 'production' && warn('v-on:' + this.arg + '="' + this.expression + '" expects a function value, ' + 'got ' + handler, this.vm);
          return;
        }
  
        // apply modifiers
        if (this.modifiers.stop) {
          handler = stopFilter(handler);
        }
        if (this.modifiers.prevent) {
          handler = preventFilter(handler);
        }
        if (this.modifiers.self) {
          handler = selfFilter(handler);
        }
        // key filter
        var keys = Object.keys(this.modifiers).filter(function (key) {
          return key !== 'stop' && key !== 'prevent' && key !== 'self' && key !== 'capture';
        });
        if (keys.length) {
          handler = keyFilter(handler, keys);
        }
  
        this.reset();
        this.handler = handler;
  
        if (this.iframeBind) {
          this.iframeBind();
        } else {
          on(this.el, this.arg, this.handler, this.modifiers.capture);
        }
      },
  
      reset: function reset() {
        var el = this.iframeBind ? this.el.contentWindow : this.el;
        if (this.handler) {
          off(el, this.arg, this.handler);
        }
      },
  
      unbind: function unbind() {
        this.reset();
      }
    };
  
    var prefixes = ['-webkit-', '-moz-', '-ms-'];
    var camelPrefixes = ['Webkit', 'Moz', 'ms'];
    var importantRE = /!important;?$/;
    var propCache = Object.create(null);
  
    var testEl = null;
  
    var style = {
  
      deep: true,
  
      update: function update(value) {
        if (typeof value === 'string') {
          this.el.style.cssText = value;
        } else if (isArray(value)) {
          this.handleObject(value.reduce(extend, {}));
        } else {
          this.handleObject(value || {});
        }
      },
  
      handleObject: function handleObject(value) {
        // cache object styles so that only changed props
        // are actually updated.
        var cache = this.cache || (this.cache = {});
        var name, val;
        for (name in cache) {
          if (!(name in value)) {
            this.handleSingle(name, null);
            delete cache[name];
          }
        }
        for (name in value) {
          val = value[name];
          if (val !== cache[name]) {
            cache[name] = val;
            this.handleSingle(name, val);
          }
        }
      },
  
      handleSingle: function handleSingle(prop, value) {
        prop = normalize(prop);
        if (!prop) return; // unsupported prop
        // cast possible numbers/booleans into strings
        if (value != null) value += '';
        if (value) {
          var isImportant = importantRE.test(value) ? 'important' : '';
          if (isImportant) {
            /* istanbul ignore if */
            if ('development' !== 'production') {
              warn('It\'s probably a bad idea to use !important with inline rules. ' + 'This feature will be deprecated in a future version of Vue.');
            }
            value = value.replace(importantRE, '').trim();
            this.el.style.setProperty(prop.kebab, value, isImportant);
          } else {
            this.el.style[prop.camel] = value;
          }
        } else {
          this.el.style[prop.camel] = '';
        }
      }
  
    };
  
    /**
     * Normalize a CSS property name.
     * - cache result
     * - auto prefix
     * - camelCase -> dash-case
     *
     * @param {String} prop
     * @return {String}
     */
  
    function normalize(prop) {
      if (propCache[prop]) {
        return propCache[prop];
      }
      var res = prefix(prop);
      propCache[prop] = propCache[res] = res;
      return res;
    }
  
    /**
     * Auto detect the appropriate prefix for a CSS property.
     * https://gist.github.com/paulirish/523692
     *
     * @param {String} prop
     * @return {String}
     */
  
    function prefix(prop) {
      prop = hyphenate(prop);
      var camel = camelize(prop);
      var upper = camel.charAt(0).toUpperCase() + camel.slice(1);
      if (!testEl) {
        testEl = document.createElement('div');
      }
      var i = prefixes.length;
      var prefixed;
      if (camel !== 'filter' && camel in testEl.style) {
        return {
          kebab: prop,
          camel: camel
        };
      }
      while (i--) {
        prefixed = camelPrefixes[i] + upper;
        if (prefixed in testEl.style) {
          return {
            kebab: prefixes[i] + prop,
            camel: prefixed
          };
        }
      }
    }
  
    // xlink
    var xlinkNS = 'http://www.w3.org/1999/xlink';
    var xlinkRE = /^xlink:/;
  
    // check for attributes that prohibit interpolations
    var disallowedInterpAttrRE = /^v-|^:|^@|^(?:is|transition|transition-mode|debounce|track-by|stagger|enter-stagger|leave-stagger)$/;
    // these attributes should also set their corresponding properties
    // because they only affect the initial state of the element
    var attrWithPropsRE = /^(?:value|checked|selected|muted)$/;
    // these attributes expect enumrated values of "true" or "false"
    // but are not boolean attributes
    var enumeratedAttrRE = /^(?:draggable|contenteditable|spellcheck)$/;
  
    // these attributes should set a hidden property for
    // binding v-model to object values
    var modelProps = {
      value: '_value',
      'true-value': '_trueValue',
      'false-value': '_falseValue'
    };
  
    var bind$1 = {
  
      priority: BIND,
  
      bind: function bind() {
        var attr = this.arg;
        var tag = this.el.tagName;
        // should be deep watch on object mode
        if (!attr) {
          this.deep = true;
        }
        // handle interpolation bindings
        var descriptor = this.descriptor;
        var tokens = descriptor.interp;
        if (tokens) {
          // handle interpolations with one-time tokens
          if (descriptor.hasOneTime) {
            this.expression = tokensToExp(tokens, this._scope || this.vm);
          }
  
          // only allow binding on native attributes
          if (disallowedInterpAttrRE.test(attr) || attr === 'name' && (tag === 'PARTIAL' || tag === 'SLOT')) {
            'development' !== 'production' && warn(attr + '="' + descriptor.raw + '": ' + 'attribute interpolation is not allowed in Vue.js ' + 'directives and special attributes.', this.vm);
            this.el.removeAttribute(attr);
            this.invalid = true;
          }
  
          /* istanbul ignore if */
          if ('development' !== 'production') {
            var raw = attr + '="' + descriptor.raw + '": ';
            // warn src
            if (attr === 'src') {
              warn(raw + 'interpolation in "src" attribute will cause ' + 'a 404 request. Use v-bind:src instead.', this.vm);
            }
  
            // warn style
            if (attr === 'style') {
              warn(raw + 'interpolation in "style" attribute will cause ' + 'the attribute to be discarded in Internet Explorer. ' + 'Use v-bind:style instead.', this.vm);
            }
          }
        }
      },
  
      update: function update(value) {
        if (this.invalid) {
          return;
        }
        var attr = this.arg;
        if (this.arg) {
          this.handleSingle(attr, value);
        } else {
          this.handleObject(value || {});
        }
      },
  
      // share object handler with v-bind:class
      handleObject: style.handleObject,
  
      handleSingle: function handleSingle(attr, value) {
        var el = this.el;
        var interp = this.descriptor.interp;
        if (this.modifiers.camel) {
          attr = camelize(attr);
        }
        if (!interp && attrWithPropsRE.test(attr) && attr in el) {
          var attrValue = attr === 'value' ? value == null // IE9 will set input.value to "null" for null...
          ? '' : value : value;
  
          if (el[attr] !== attrValue) {
            el[attr] = attrValue;
          }
        }
        // set model props
        var modelProp = modelProps[attr];
        if (!interp && modelProp) {
          el[modelProp] = value;
          // update v-model if present
          var model = el.__v_model;
          if (model) {
            model.listener();
          }
        }
        // do not set value attribute for textarea
        if (attr === 'value' && el.tagName === 'TEXTAREA') {
          el.removeAttribute(attr);
          return;
        }
        // update attribute
        if (enumeratedAttrRE.test(attr)) {
          el.setAttribute(attr, value ? 'true' : 'false');
        } else if (value != null && value !== false) {
          if (attr === 'class') {
            // handle edge case #1960:
            // class interpolation should not overwrite Vue transition class
            if (el.__v_trans) {
              value += ' ' + el.__v_trans.id + '-transition';
            }
            setClass(el, value);
          } else if (xlinkRE.test(attr)) {
            el.setAttributeNS(xlinkNS, attr, value === true ? '' : value);
          } else {
            el.setAttribute(attr, value === true ? '' : value);
          }
        } else {
          el.removeAttribute(attr);
        }
      }
    };
  
    var el = {
  
      priority: EL,
  
      bind: function bind() {
        /* istanbul ignore if */
        if (!this.arg) {
          return;
        }
        var id = this.id = camelize(this.arg);
        var refs = (this._scope || this.vm).$els;
        if (hasOwn(refs, id)) {
          refs[id] = this.el;
        } else {
          defineReactive(refs, id, this.el);
        }
      },
  
      unbind: function unbind() {
        var refs = (this._scope || this.vm).$els;
        if (refs[this.id] === this.el) {
          refs[this.id] = null;
        }
      }
    };
  
    var ref = {
      bind: function bind() {
        'development' !== 'production' && warn('v-ref:' + this.arg + ' must be used on a child ' + 'component. Found on <' + this.el.tagName.toLowerCase() + '>.', this.vm);
      }
    };
  
    var cloak = {
      bind: function bind() {
        var el = this.el;
        this.vm.$once('pre-hook:compiled', function () {
          el.removeAttribute('v-cloak');
        });
      }
    };
  
    // must export plain object
    var directives = {
      text: text$1,
      html: html,
      'for': vFor,
      'if': vIf,
      show: show,
      model: model,
      on: on$1,
      bind: bind$1,
      el: el,
      ref: ref,
      cloak: cloak
    };
  
    var vClass = {
  
      deep: true,
  
      update: function update(value) {
        if (!value) {
          this.cleanup();
        } else if (typeof value === 'string') {
          this.setClass(value.trim().split(/\s+/));
        } else {
          this.setClass(normalize$1(value));
        }
      },
  
      setClass: function setClass(value) {
        this.cleanup(value);
        for (var i = 0, l = value.length; i < l; i++) {
          var val = value[i];
          if (val) {
            apply(this.el, val, addClass);
          }
        }
        this.prevKeys = value;
      },
  
      cleanup: function cleanup(value) {
        var prevKeys = this.prevKeys;
        if (!prevKeys) return;
        var i = prevKeys.length;
        while (i--) {
          var key = prevKeys[i];
          if (!value || value.indexOf(key) < 0) {
            apply(this.el, key, removeClass);
          }
        }
      }
    };
  
    /**
     * Normalize objects and arrays (potentially containing objects)
     * into array of strings.
     *
     * @param {Object|Array<String|Object>} value
     * @return {Array<String>}
     */
  
    function normalize$1(value) {
      var res = [];
      if (isArray(value)) {
        for (var i = 0, l = value.length; i < l; i++) {
          var _key = value[i];
          if (_key) {
            if (typeof _key === 'string') {
              res.push(_key);
            } else {
              for (var k in _key) {
                if (_key[k]) res.push(k);
              }
            }
          }
        }
      } else if (isObject(value)) {
        for (var key in value) {
          if (value[key]) res.push(key);
        }
      }
      return res;
    }
  
    /**
     * Add or remove a class/classes on an element
     *
     * @param {Element} el
     * @param {String} key The class name. This may or may not
     *                     contain a space character, in such a
     *                     case we'll deal with multiple class
     *                     names at once.
     * @param {Function} fn
     */
  
    function apply(el, key, fn) {
      key = key.trim();
      if (key.indexOf(' ') === -1) {
        fn(el, key);
        return;
      }
      // The key contains one or more space characters.
      // Since a class name doesn't accept such characters, we
      // treat it as multiple classes.
      var keys = key.split(/\s+/);
      for (var i = 0, l = keys.length; i < l; i++) {
        fn(el, keys[i]);
      }
    }
  
    var component = {
  
      priority: COMPONENT,
  
      params: ['keep-alive', 'transition-mode', 'inline-template'],
  
      /**
       * Setup. Two possible usages:
       *
       * - static:
       *   <comp> or <div v-component="comp">
       *
       * - dynamic:
       *   <component :is="view">
       */
  
      bind: function bind() {
        if (!this.el.__vue__) {
          // keep-alive cache
          this.keepAlive = this.params.keepAlive;
          if (this.keepAlive) {
            this.cache = {};
          }
          // check inline-template
          if (this.params.inlineTemplate) {
            // extract inline template as a DocumentFragment
            this.inlineTemplate = extractContent(this.el, true);
          }
          // component resolution related state
          this.pendingComponentCb = this.Component = null;
          // transition related state
          this.pendingRemovals = 0;
          this.pendingRemovalCb = null;
          // create a ref anchor
          this.anchor = createAnchor('v-component');
          replace(this.el, this.anchor);
          // remove is attribute.
          // this is removed during compilation, but because compilation is
          // cached, when the component is used elsewhere this attribute
          // will remain at link time.
          this.el.removeAttribute('is');
          this.el.removeAttribute(':is');
          // remove ref, same as above
          if (this.descriptor.ref) {
            this.el.removeAttribute('v-ref:' + hyphenate(this.descriptor.ref));
          }
          // if static, build right now.
          if (this.literal) {
            this.setComponent(this.expression);
          }
        } else {
          'development' !== 'production' && warn('cannot mount component "' + this.expression + '" ' + 'on already mounted element: ' + this.el);
        }
      },
  
      /**
       * Public update, called by the watcher in the dynamic
       * literal scenario, e.g. <component :is="view">
       */
  
      update: function update(value) {
        if (!this.literal) {
          this.setComponent(value);
        }
      },
  
      /**
       * Switch dynamic components. May resolve the component
       * asynchronously, and perform transition based on
       * specified transition mode. Accepts a few additional
       * arguments specifically for vue-router.
       *
       * The callback is called when the full transition is
       * finished.
       *
       * @param {String} value
       * @param {Function} [cb]
       */
  
      setComponent: function setComponent(value, cb) {
        this.invalidatePending();
        if (!value) {
          // just remove current
          this.unbuild(true);
          this.remove(this.childVM, cb);
          this.childVM = null;
        } else {
          var self = this;
          this.resolveComponent(value, function () {
            self.mountComponent(cb);
          });
        }
      },
  
      /**
       * Resolve the component constructor to use when creating
       * the child vm.
       *
       * @param {String|Function} value
       * @param {Function} cb
       */
  
      resolveComponent: function resolveComponent(value, cb) {
        var self = this;
        this.pendingComponentCb = cancellable(function (Component) {
          self.ComponentName = Component.options.name || (typeof value === 'string' ? value : null);
          self.Component = Component;
          cb();
        });
        this.vm._resolveComponent(value, this.pendingComponentCb);
      },
  
      /**
       * Create a new instance using the current constructor and
       * replace the existing instance. This method doesn't care
       * whether the new component and the old one are actually
       * the same.
       *
       * @param {Function} [cb]
       */
  
      mountComponent: function mountComponent(cb) {
        // actual mount
        this.unbuild(true);
        var self = this;
        var activateHooks = this.Component.options.activate;
        var cached = this.getCached();
        var newComponent = this.build();
        if (activateHooks && !cached) {
          this.waitingFor = newComponent;
          callActivateHooks(activateHooks, newComponent, function () {
            if (self.waitingFor !== newComponent) {
              return;
            }
            self.waitingFor = null;
            self.transition(newComponent, cb);
          });
        } else {
          // update ref for kept-alive component
          if (cached) {
            newComponent._updateRef();
          }
          this.transition(newComponent, cb);
        }
      },
  
      /**
       * When the component changes or unbinds before an async
       * constructor is resolved, we need to invalidate its
       * pending callback.
       */
  
      invalidatePending: function invalidatePending() {
        if (this.pendingComponentCb) {
          this.pendingComponentCb.cancel();
          this.pendingComponentCb = null;
        }
      },
  
      /**
       * Instantiate/insert a new child vm.
       * If keep alive and has cached instance, insert that
       * instance; otherwise build a new one and cache it.
       *
       * @param {Object} [extraOptions]
       * @return {Vue} - the created instance
       */
  
      build: function build(extraOptions) {
        var cached = this.getCached();
        if (cached) {
          return cached;
        }
        if (this.Component) {
          // default options
          var options = {
            name: this.ComponentName,
            el: cloneNode(this.el),
            template: this.inlineTemplate,
            // make sure to add the child with correct parent
            // if this is a transcluded component, its parent
            // should be the transclusion host.
            parent: this._host || this.vm,
            // if no inline-template, then the compiled
            // linker can be cached for better performance.
            _linkerCachable: !this.inlineTemplate,
            _ref: this.descriptor.ref,
            _asComponent: true,
            _isRouterView: this._isRouterView,
            // if this is a transcluded component, context
            // will be the common parent vm of this instance
            // and its host.
            _context: this.vm,
            // if this is inside an inline v-for, the scope
            // will be the intermediate scope created for this
            // repeat fragment. this is used for linking props
            // and container directives.
            _scope: this._scope,
            // pass in the owner fragment of this component.
            // this is necessary so that the fragment can keep
            // track of its contained components in order to
            // call attach/detach hooks for them.
            _frag: this._frag
          };
          // extra options
          // in 1.0.0 this is used by vue-router only
          /* istanbul ignore if */
          if (extraOptions) {
            extend(options, extraOptions);
          }
          var child = new this.Component(options);
          if (this.keepAlive) {
            this.cache[this.Component.cid] = child;
          }
          /* istanbul ignore if */
          if ('development' !== 'production' && this.el.hasAttribute('transition') && child._isFragment) {
            warn('Transitions will not work on a fragment instance. ' + 'Template: ' + child.$options.template, child);
          }
          return child;
        }
      },
  
      /**
       * Try to get a cached instance of the current component.
       *
       * @return {Vue|undefined}
       */
  
      getCached: function getCached() {
        return this.keepAlive && this.cache[this.Component.cid];
      },
  
      /**
       * Teardown the current child, but defers cleanup so
       * that we can separate the destroy and removal steps.
       *
       * @param {Boolean} defer
       */
  
      unbuild: function unbuild(defer) {
        if (this.waitingFor) {
          if (!this.keepAlive) {
            this.waitingFor.$destroy();
          }
          this.waitingFor = null;
        }
        var child = this.childVM;
        if (!child || this.keepAlive) {
          if (child) {
            // remove ref
            child._inactive = true;
            child._updateRef(true);
          }
          return;
        }
        // the sole purpose of `deferCleanup` is so that we can
        // "deactivate" the vm right now and perform DOM removal
        // later.
        child.$destroy(false, defer);
      },
  
      /**
       * Remove current destroyed child and manually do
       * the cleanup after removal.
       *
       * @param {Function} cb
       */
  
      remove: function remove(child, cb) {
        var keepAlive = this.keepAlive;
        if (child) {
          // we may have a component switch when a previous
          // component is still being transitioned out.
          // we want to trigger only one lastest insertion cb
          // when the existing transition finishes. (#1119)
          this.pendingRemovals++;
          this.pendingRemovalCb = cb;
          var self = this;
          child.$remove(function () {
            self.pendingRemovals--;
            if (!keepAlive) child._cleanup();
            if (!self.pendingRemovals && self.pendingRemovalCb) {
              self.pendingRemovalCb();
              self.pendingRemovalCb = null;
            }
          });
        } else if (cb) {
          cb();
        }
      },
  
      /**
       * Actually swap the components, depending on the
       * transition mode. Defaults to simultaneous.
       *
       * @param {Vue} target
       * @param {Function} [cb]
       */
  
      transition: function transition(target, cb) {
        var self = this;
        var current = this.childVM;
        // for devtool inspection
        if (current) current._inactive = true;
        target._inactive = false;
        this.childVM = target;
        switch (self.params.transitionMode) {
          case 'in-out':
            target.$before(self.anchor, function () {
              self.remove(current, cb);
            });
            break;
          case 'out-in':
            self.remove(current, function () {
              target.$before(self.anchor, cb);
            });
            break;
          default:
            self.remove(current);
            target.$before(self.anchor, cb);
        }
      },
  
      /**
       * Unbind.
       */
  
      unbind: function unbind() {
        this.invalidatePending();
        // Do not defer cleanup when unbinding
        this.unbuild();
        // destroy all keep-alive cached instances
        if (this.cache) {
          for (var key in this.cache) {
            this.cache[key].$destroy();
          }
          this.cache = null;
        }
      }
    };
  
    /**
     * Call activate hooks in order (asynchronous)
     *
     * @param {Array} hooks
     * @param {Vue} vm
     * @param {Function} cb
     */
  
    function callActivateHooks(hooks, vm, cb) {
      var total = hooks.length;
      var called = 0;
      hooks[0].call(vm, next);
      function next() {
        if (++called >= total) {
          cb();
        } else {
          hooks[called].call(vm, next);
        }
      }
    }
  
    var propBindingModes = config._propBindingModes;
    var empty = {};
  
    // regexes
    var identRE$1 = /^[$_a-zA-Z]+[\w$]*$/;
    var settablePathRE = /^[A-Za-z_$][\w$]*(\.[A-Za-z_$][\w$]*|\[[^\[\]]+\])*$/;
  
    /**
     * Compile props on a root element and return
     * a props link function.
     *
     * @param {Element|DocumentFragment} el
     * @param {Array} propOptions
     * @param {Vue} vm
     * @return {Function} propsLinkFn
     */
  
    function compileProps(el, propOptions, vm) {
      var props = [];
      var names = Object.keys(propOptions);
      var i = names.length;
      var options, name, attr, value, path, parsed, prop;
      while (i--) {
        name = names[i];
        options = propOptions[name] || empty;
  
        if ('development' !== 'production' && name === '$data') {
          warn('Do not use $data as prop.', vm);
          continue;
        }
  
        // props could contain dashes, which will be
        // interpreted as minus calculations by the parser
        // so we need to camelize the path here
        path = camelize(name);
        if (!identRE$1.test(path)) {
          'development' !== 'production' && warn('Invalid prop key: "' + name + '". Prop keys ' + 'must be valid identifiers.', vm);
          continue;
        }
  
        prop = {
          name: name,
          path: path,
          options: options,
          mode: propBindingModes.ONE_WAY,
          raw: null
        };
  
        attr = hyphenate(name);
        // first check dynamic version
        if ((value = getBindAttr(el, attr)) === null) {
          if ((value = getBindAttr(el, attr + '.sync')) !== null) {
            prop.mode = propBindingModes.TWO_WAY;
          } else if ((value = getBindAttr(el, attr + '.once')) !== null) {
            prop.mode = propBindingModes.ONE_TIME;
          }
        }
        if (value !== null) {
          // has dynamic binding!
          prop.raw = value;
          parsed = parseDirective(value);
          value = parsed.expression;
          prop.filters = parsed.filters;
          // check binding type
          if (isLiteral(value) && !parsed.filters) {
            // for expressions containing literal numbers and
            // booleans, there's no need to setup a prop binding,
            // so we can optimize them as a one-time set.
            prop.optimizedLiteral = true;
          } else {
            prop.dynamic = true;
            // check non-settable path for two-way bindings
            if ('development' !== 'production' && prop.mode === propBindingModes.TWO_WAY && !settablePathRE.test(value)) {
              prop.mode = propBindingModes.ONE_WAY;
              warn('Cannot bind two-way prop with non-settable ' + 'parent path: ' + value, vm);
            }
          }
          prop.parentPath = value;
  
          // warn required two-way
          if ('development' !== 'production' && options.twoWay && prop.mode !== propBindingModes.TWO_WAY) {
            warn('Prop "' + name + '" expects a two-way binding type.', vm);
          }
        } else if ((value = getAttr(el, attr)) !== null) {
          // has literal binding!
          prop.raw = value;
        } else if ('development' !== 'production') {
          // check possible camelCase prop usage
          var lowerCaseName = path.toLowerCase();
          value = /[A-Z\-]/.test(name) && (el.getAttribute(lowerCaseName) || el.getAttribute(':' + lowerCaseName) || el.getAttribute('v-bind:' + lowerCaseName) || el.getAttribute(':' + lowerCaseName + '.once') || el.getAttribute('v-bind:' + lowerCaseName + '.once') || el.getAttribute(':' + lowerCaseName + '.sync') || el.getAttribute('v-bind:' + lowerCaseName + '.sync'));
          if (value) {
            warn('Possible usage error for prop `' + lowerCaseName + '` - ' + 'did you mean `' + attr + '`? HTML is case-insensitive, remember to use ' + 'kebab-case for props in templates.', vm);
          } else if (options.required) {
            // warn missing required
            warn('Missing required prop: ' + name, vm);
          }
        }
        // push prop
        props.push(prop);
      }
      return makePropsLinkFn(props);
    }
  
    /**
     * Build a function that applies props to a vm.
     *
     * @param {Array} props
     * @return {Function} propsLinkFn
     */
  
    function makePropsLinkFn(props) {
      return function propsLinkFn(vm, scope) {
        // store resolved props info
        vm._props = {};
        var inlineProps = vm.$options.propsData;
        var i = props.length;
        var prop, path, options, value, raw;
        while (i--) {
          prop = props[i];
          raw = prop.raw;
          path = prop.path;
          options = prop.options;
          vm._props[path] = prop;
          if (inlineProps && hasOwn(inlineProps, path)) {
            initProp(vm, prop, inlineProps[path]);
          }if (raw === null) {
            // initialize absent prop
            initProp(vm, prop, undefined);
          } else if (prop.dynamic) {
            // dynamic prop
            if (prop.mode === propBindingModes.ONE_TIME) {
              // one time binding
              value = (scope || vm._context || vm).$get(prop.parentPath);
              initProp(vm, prop, value);
            } else {
              if (vm._context) {
                // dynamic binding
                vm._bindDir({
                  name: 'prop',
                  def: propDef,
                  prop: prop
                }, null, null, scope); // el, host, scope
              } else {
                  // root instance
                  initProp(vm, prop, vm.$get(prop.parentPath));
                }
            }
          } else if (prop.optimizedLiteral) {
            // optimized literal, cast it and just set once
            var stripped = stripQuotes(raw);
            value = stripped === raw ? toBoolean(toNumber(raw)) : stripped;
            initProp(vm, prop, value);
          } else {
            // string literal, but we need to cater for
            // Boolean props with no value, or with same
            // literal value (e.g. disabled="disabled")
            // see https://github.com/vuejs/vue-loader/issues/182
            value = options.type === Boolean && (raw === '' || raw === hyphenate(prop.name)) ? true : raw;
            initProp(vm, prop, value);
          }
        }
      };
    }
  
    /**
     * Process a prop with a rawValue, applying necessary coersions,
     * default values & assertions and call the given callback with
     * processed value.
     *
     * @param {Vue} vm
     * @param {Object} prop
     * @param {*} rawValue
     * @param {Function} fn
     */
  
    function processPropValue(vm, prop, rawValue, fn) {
      var isSimple = prop.dynamic && isSimplePath(prop.parentPath);
      var value = rawValue;
      if (value === undefined) {
        value = getPropDefaultValue(vm, prop);
      }
      value = coerceProp(prop, value, vm);
      var coerced = value !== rawValue;
      if (!assertProp(prop, value, vm)) {
        value = undefined;
      }
      if (isSimple && !coerced) {
        withoutConversion(function () {
          fn(value);
        });
      } else {
        fn(value);
      }
    }
  
    /**
     * Set a prop's initial value on a vm and its data object.
     *
     * @param {Vue} vm
     * @param {Object} prop
     * @param {*} value
     */
  
    function initProp(vm, prop, value) {
      processPropValue(vm, prop, value, function (value) {
        defineReactive(vm, prop.path, value);
      });
    }
  
    /**
     * Update a prop's value on a vm.
     *
     * @param {Vue} vm
     * @param {Object} prop
     * @param {*} value
     */
  
    function updateProp(vm, prop, value) {
      processPropValue(vm, prop, value, function (value) {
        vm[prop.path] = value;
      });
    }
  
    /**
     * Get the default value of a prop.
     *
     * @param {Vue} vm
     * @param {Object} prop
     * @return {*}
     */
  
    function getPropDefaultValue(vm, prop) {
      // no default, return undefined
      var options = prop.options;
      if (!hasOwn(options, 'default')) {
        // absent boolean value defaults to false
        return options.type === Boolean ? false : undefined;
      }
      var def = options['default'];
      // warn against non-factory defaults for Object & Array
      if (isObject(def)) {
        'development' !== 'production' && warn('Invalid default value for prop "' + prop.name + '": ' + 'Props with type Object/Array must use a factory function ' + 'to return the default value.', vm);
      }
      // call factory function for non-Function types
      return typeof def === 'function' && options.type !== Function ? def.call(vm) : def;
    }
  
    /**
     * Assert whether a prop is valid.
     *
     * @param {Object} prop
     * @param {*} value
     * @param {Vue} vm
     */
  
    function assertProp(prop, value, vm) {
      if (!prop.options.required && ( // non-required
      prop.raw === null || // abscent
      value == null) // null or undefined
      ) {
          return true;
        }
      var options = prop.options;
      var type = options.type;
      var valid = !type;
      var expectedTypes = [];
      if (type) {
        if (!isArray(type)) {
          type = [type];
        }
        for (var i = 0; i < type.length && !valid; i++) {
          var assertedType = assertType(value, type[i]);
          expectedTypes.push(assertedType.expectedType);
          valid = assertedType.valid;
        }
      }
      if (!valid) {
        if ('development' !== 'production') {
          warn('Invalid prop: type check failed for prop "' + prop.name + '".' + ' Expected ' + expectedTypes.map(formatType).join(', ') + ', got ' + formatValue(value) + '.', vm);
        }
        return false;
      }
      var validator = options.validator;
      if (validator) {
        if (!validator(value)) {
          'development' !== 'production' && warn('Invalid prop: custom validator check failed for prop "' + prop.name + '".', vm);
          return false;
        }
      }
      return true;
    }
  
    /**
     * Force parsing value with coerce option.
     *
     * @param {*} value
     * @param {Object} options
     * @return {*}
     */
  
    function coerceProp(prop, value, vm) {
      var coerce = prop.options.coerce;
      if (!coerce) {
        return value;
      }
      if (typeof coerce === 'function') {
        return coerce(value);
      } else {
        'development' !== 'production' && warn('Invalid coerce for prop "' + prop.name + '": expected function, got ' + typeof coerce + '.', vm);
        return value;
      }
    }
  
    /**
     * Assert the type of a value
     *
     * @param {*} value
     * @param {Function} type
     * @return {Object}
     */
  
    function assertType(value, type) {
      var valid;
      var expectedType;
      if (type === String) {
        expectedType = 'string';
        valid = typeof value === expectedType;
      } else if (type === Number) {
        expectedType = 'number';
        valid = typeof value === expectedType;
      } else if (type === Boolean) {
        expectedType = 'boolean';
        valid = typeof value === expectedType;
      } else if (type === Function) {
        expectedType = 'function';
        valid = typeof value === expectedType;
      } else if (type === Object) {
        expectedType = 'object';
        valid = isPlainObject(value);
      } else if (type === Array) {
        expectedType = 'array';
        valid = isArray(value);
      } else {
        valid = value instanceof type;
      }
      return {
        valid: valid,
        expectedType: expectedType
      };
    }
  
    /**
     * Format type for output
     *
     * @param {String} type
     * @return {String}
     */
  
    function formatType(type) {
      return type ? type.charAt(0).toUpperCase() + type.slice(1) : 'custom type';
    }
  
    /**
     * Format value
     *
     * @param {*} value
     * @return {String}
     */
  
    function formatValue(val) {
      return Object.prototype.toString.call(val).slice(8, -1);
    }
  
    var bindingModes = config._propBindingModes;
  
    var propDef = {
  
      bind: function bind() {
        var child = this.vm;
        var parent = child._context;
        // passed in from compiler directly
        var prop = this.descriptor.prop;
        var childKey = prop.path;
        var parentKey = prop.parentPath;
        var twoWay = prop.mode === bindingModes.TWO_WAY;
  
        var parentWatcher = this.parentWatcher = new Watcher(parent, parentKey, function (val) {
          updateProp(child, prop, val);
        }, {
          twoWay: twoWay,
          filters: prop.filters,
          // important: props need to be observed on the
          // v-for scope if present
          scope: this._scope
        });
  
        // set the child initial value.
        initProp(child, prop, parentWatcher.value);
  
        // setup two-way binding
        if (twoWay) {
          // important: defer the child watcher creation until
          // the created hook (after data observation)
          var self = this;
          child.$once('pre-hook:created', function () {
            self.childWatcher = new Watcher(child, childKey, function (val) {
              parentWatcher.set(val);
            }, {
              // ensure sync upward before parent sync down.
              // this is necessary in cases e.g. the child
              // mutates a prop array, then replaces it. (#1683)
              sync: true
            });
          });
        }
      },
  
      unbind: function unbind() {
        this.parentWatcher.teardown();
        if (this.childWatcher) {
          this.childWatcher.teardown();
        }
      }
    };
  
    var queue$1 = [];
    var queued = false;
  
    /**
     * Push a job into the queue.
     *
     * @param {Function} job
     */
  
    function pushJob(job) {
      queue$1.push(job);
      if (!queued) {
        queued = true;
        nextTick(flush);
      }
    }
  
    /**
     * Flush the queue, and do one forced reflow before
     * triggering transitions.
     */
  
    function flush() {
      // Force layout
      var f = document.documentElement.offsetHeight;
      for (var i = 0; i < queue$1.length; i++) {
        queue$1[i]();
      }
      queue$1 = [];
      queued = false;
      // dummy return, so js linters don't complain about
      // unused variable f
      return f;
    }
  
    var TYPE_TRANSITION = 'transition';
    var TYPE_ANIMATION = 'animation';
    var transDurationProp = transitionProp + 'Duration';
    var animDurationProp = animationProp + 'Duration';
  
    /**
     * If a just-entered element is applied the
     * leave class while its enter transition hasn't started yet,
     * and the transitioned property has the same value for both
     * enter/leave, then the leave transition will be skipped and
     * the transitionend event never fires. This function ensures
     * its callback to be called after a transition has started
     * by waiting for double raf.
     *
     * It falls back to setTimeout on devices that support CSS
     * transitions but not raf (e.g. Android 4.2 browser) - since
     * these environments are usually slow, we are giving it a
     * relatively large timeout.
     */
  
    var raf = inBrowser && window.requestAnimationFrame;
    var waitForTransitionStart = raf
    /* istanbul ignore next */
    ? function (fn) {
      raf(function () {
        raf(fn);
      });
    } : function (fn) {
      setTimeout(fn, 50);
    };
  
    /**
     * A Transition object that encapsulates the state and logic
     * of the transition.
     *
     * @param {Element} el
     * @param {String} id
     * @param {Object} hooks
     * @param {Vue} vm
     */
    function Transition(el, id, hooks, vm) {
      this.id = id;
      this.el = el;
      this.enterClass = hooks && hooks.enterClass || id + '-enter';
      this.leaveClass = hooks && hooks.leaveClass || id + '-leave';
      this.hooks = hooks;
      this.vm = vm;
      // async state
      this.pendingCssEvent = this.pendingCssCb = this.cancel = this.pendingJsCb = this.op = this.cb = null;
      this.justEntered = false;
      this.entered = this.left = false;
      this.typeCache = {};
      // check css transition type
      this.type = hooks && hooks.type;
      /* istanbul ignore if */
      if ('development' !== 'production') {
        if (this.type && this.type !== TYPE_TRANSITION && this.type !== TYPE_ANIMATION) {
          warn('invalid CSS transition type for transition="' + this.id + '": ' + this.type, vm);
        }
      }
      // bind
      var self = this;['enterNextTick', 'enterDone', 'leaveNextTick', 'leaveDone'].forEach(function (m) {
        self[m] = bind(self[m], self);
      });
    }
  
    var p$1 = Transition.prototype;
  
    /**
     * Start an entering transition.
     *
     * 1. enter transition triggered
     * 2. call beforeEnter hook
     * 3. add enter class
     * 4. insert/show element
     * 5. call enter hook (with possible explicit js callback)
     * 6. reflow
     * 7. based on transition type:
     *    - transition:
     *        remove class now, wait for transitionend,
     *        then done if there's no explicit js callback.
     *    - animation:
     *        wait for animationend, remove class,
     *        then done if there's no explicit js callback.
     *    - no css transition:
     *        done now if there's no explicit js callback.
     * 8. wait for either done or js callback, then call
     *    afterEnter hook.
     *
     * @param {Function} op - insert/show the element
     * @param {Function} [cb]
     */
  
    p$1.enter = function (op, cb) {
      this.cancelPending();
      this.callHook('beforeEnter');
      this.cb = cb;
      addClass(this.el, this.enterClass);
      op();
      this.entered = false;
      this.callHookWithCb('enter');
      if (this.entered) {
        return; // user called done synchronously.
      }
      this.cancel = this.hooks && this.hooks.enterCancelled;
      pushJob(this.enterNextTick);
    };
  
    /**
     * The "nextTick" phase of an entering transition, which is
     * to be pushed into a queue and executed after a reflow so
     * that removing the class can trigger a CSS transition.
     */
  
    p$1.enterNextTick = function () {
      var _this = this;
  
      // prevent transition skipping
      this.justEntered = true;
      waitForTransitionStart(function () {
        _this.justEntered = false;
      });
      var enterDone = this.enterDone;
      var type = this.getCssTransitionType(this.enterClass);
      if (!this.pendingJsCb) {
        if (type === TYPE_TRANSITION) {
          // trigger transition by removing enter class now
          removeClass(this.el, this.enterClass);
          this.setupCssCb(transitionEndEvent, enterDone);
        } else if (type === TYPE_ANIMATION) {
          this.setupCssCb(animationEndEvent, enterDone);
        } else {
          enterDone();
        }
      } else if (type === TYPE_TRANSITION) {
        removeClass(this.el, this.enterClass);
      }
    };
  
    /**
     * The "cleanup" phase of an entering transition.
     */
  
    p$1.enterDone = function () {
      this.entered = true;
      this.cancel = this.pendingJsCb = null;
      removeClass(this.el, this.enterClass);
      this.callHook('afterEnter');
      if (this.cb) this.cb();
    };
  
    /**
     * Start a leaving transition.
     *
     * 1. leave transition triggered.
     * 2. call beforeLeave hook
     * 3. add leave class (trigger css transition)
     * 4. call leave hook (with possible explicit js callback)
     * 5. reflow if no explicit js callback is provided
     * 6. based on transition type:
     *    - transition or animation:
     *        wait for end event, remove class, then done if
     *        there's no explicit js callback.
     *    - no css transition:
     *        done if there's no explicit js callback.
     * 7. wait for either done or js callback, then call
     *    afterLeave hook.
     *
     * @param {Function} op - remove/hide the element
     * @param {Function} [cb]
     */
  
    p$1.leave = function (op, cb) {
      this.cancelPending();
      this.callHook('beforeLeave');
      this.op = op;
      this.cb = cb;
      addClass(this.el, this.leaveClass);
      this.left = false;
      this.callHookWithCb('leave');
      if (this.left) {
        return; // user called done synchronously.
      }
      this.cancel = this.hooks && this.hooks.leaveCancelled;
      // only need to handle leaveDone if
      // 1. the transition is already done (synchronously called
      //    by the user, which causes this.op set to null)
      // 2. there's no explicit js callback
      if (this.op && !this.pendingJsCb) {
        // if a CSS transition leaves immediately after enter,
        // the transitionend event never fires. therefore we
        // detect such cases and end the leave immediately.
        if (this.justEntered) {
          this.leaveDone();
        } else {
          pushJob(this.leaveNextTick);
        }
      }
    };
  
    /**
     * The "nextTick" phase of a leaving transition.
     */
  
    p$1.leaveNextTick = function () {
      var type = this.getCssTransitionType(this.leaveClass);
      if (type) {
        var event = type === TYPE_TRANSITION ? transitionEndEvent : animationEndEvent;
        this.setupCssCb(event, this.leaveDone);
      } else {
        this.leaveDone();
      }
    };
  
    /**
     * The "cleanup" phase of a leaving transition.
     */
  
    p$1.leaveDone = function () {
      this.left = true;
      this.cancel = this.pendingJsCb = null;
      this.op();
      removeClass(this.el, this.leaveClass);
      this.callHook('afterLeave');
      if (this.cb) this.cb();
      this.op = null;
    };
  
    /**
     * Cancel any pending callbacks from a previously running
     * but not finished transition.
     */
  
    p$1.cancelPending = function () {
      this.op = this.cb = null;
      var hasPending = false;
      if (this.pendingCssCb) {
        hasPending = true;
        off(this.el, this.pendingCssEvent, this.pendingCssCb);
        this.pendingCssEvent = this.pendingCssCb = null;
      }
      if (this.pendingJsCb) {
        hasPending = true;
        this.pendingJsCb.cancel();
        this.pendingJsCb = null;
      }
      if (hasPending) {
        removeClass(this.el, this.enterClass);
        removeClass(this.el, this.leaveClass);
      }
      if (this.cancel) {
        this.cancel.call(this.vm, this.el);
        this.cancel = null;
      }
    };
  
    /**
     * Call a user-provided synchronous hook function.
     *
     * @param {String} type
     */
  
    p$1.callHook = function (type) {
      if (this.hooks && this.hooks[type]) {
        this.hooks[type].call(this.vm, this.el);
      }
    };
  
    /**
     * Call a user-provided, potentially-async hook function.
     * We check for the length of arguments to see if the hook
     * expects a `done` callback. If true, the transition's end
     * will be determined by when the user calls that callback;
     * otherwise, the end is determined by the CSS transition or
     * animation.
     *
     * @param {String} type
     */
  
    p$1.callHookWithCb = function (type) {
      var hook = this.hooks && this.hooks[type];
      if (hook) {
        if (hook.length > 1) {
          this.pendingJsCb = cancellable(this[type + 'Done']);
        }
        hook.call(this.vm, this.el, this.pendingJsCb);
      }
    };
  
    /**
     * Get an element's transition type based on the
     * calculated styles.
     *
     * @param {String} className
     * @return {Number}
     */
  
    p$1.getCssTransitionType = function (className) {
      /* istanbul ignore if */
      if (!transitionEndEvent ||
      // skip CSS transitions if page is not visible -
      // this solves the issue of transitionend events not
      // firing until the page is visible again.
      // pageVisibility API is supported in IE10+, same as
      // CSS transitions.
      document.hidden ||
      // explicit js-only transition
      this.hooks && this.hooks.css === false ||
      // element is hidden
      isHidden(this.el)) {
        return;
      }
      var type = this.type || this.typeCache[className];
      if (type) return type;
      var inlineStyles = this.el.style;
      var computedStyles = window.getComputedStyle(this.el);
      var transDuration = inlineStyles[transDurationProp] || computedStyles[transDurationProp];
      if (transDuration && transDuration !== '0s') {
        type = TYPE_TRANSITION;
      } else {
        var animDuration = inlineStyles[animDurationProp] || computedStyles[animDurationProp];
        if (animDuration && animDuration !== '0s') {
          type = TYPE_ANIMATION;
        }
      }
      if (type) {
        this.typeCache[className] = type;
      }
      return type;
    };
  
    /**
     * Setup a CSS transitionend/animationend callback.
     *
     * @param {String} event
     * @param {Function} cb
     */
  
    p$1.setupCssCb = function (event, cb) {
      this.pendingCssEvent = event;
      var self = this;
      var el = this.el;
      var onEnd = this.pendingCssCb = function (e) {
        if (e.target === el) {
          off(el, event, onEnd);
          self.pendingCssEvent = self.pendingCssCb = null;
          if (!self.pendingJsCb && cb) {
            cb();
          }
        }
      };
      on(el, event, onEnd);
    };
  
    /**
     * Check if an element is hidden - in that case we can just
     * skip the transition alltogether.
     *
     * @param {Element} el
     * @return {Boolean}
     */
  
    function isHidden(el) {
      if (/svg$/.test(el.namespaceURI)) {
        // SVG elements do not have offset(Width|Height)
        // so we need to check the client rect
        var rect = el.getBoundingClientRect();
        return !(rect.width || rect.height);
      } else {
        return !(el.offsetWidth || el.offsetHeight || el.getClientRects().length);
      }
    }
  
    var transition$1 = {
  
      priority: TRANSITION,
  
      update: function update(id, oldId) {
        var el = this.el;
        // resolve on owner vm
        var hooks = resolveAsset(this.vm.$options, 'transitions', id);
        id = id || 'v';
        oldId = oldId || 'v';
        el.__v_trans = new Transition(el, id, hooks, this.vm);
        removeClass(el, oldId + '-transition');
        addClass(el, id + '-transition');
      }
    };
  
    var internalDirectives = {
      style: style,
      'class': vClass,
      component: component,
      prop: propDef,
      transition: transition$1
    };
  
    // special binding prefixes
    var bindRE = /^v-bind:|^:/;
    var onRE = /^v-on:|^@/;
    var dirAttrRE = /^v-([^:]+)(?:$|:(.*)$)/;
    var modifierRE = /\.[^\.]+/g;
    var transitionRE = /^(v-bind:|:)?transition$/;
  
    // default directive priority
    var DEFAULT_PRIORITY = 1000;
    var DEFAULT_TERMINAL_PRIORITY = 2000;
  
    /**
     * Compile a template and return a reusable composite link
     * function, which recursively contains more link functions
     * inside. This top level compile function would normally
     * be called on instance root nodes, but can also be used
     * for partial compilation if the partial argument is true.
     *
     * The returned composite link function, when called, will
     * return an unlink function that tearsdown all directives
     * created during the linking phase.
     *
     * @param {Element|DocumentFragment} el
     * @param {Object} options
     * @param {Boolean} partial
     * @return {Function}
     */
  
    function compile(el, options, partial) {
      // link function for the node itself.
      var nodeLinkFn = partial || !options._asComponent ? compileNode(el, options) : null;
      // link function for the childNodes
      var childLinkFn = !(nodeLinkFn && nodeLinkFn.terminal) && !isScript(el) && el.hasChildNodes() ? compileNodeList(el.childNodes, options) : null;
  
      /**
       * A composite linker function to be called on a already
       * compiled piece of DOM, which instantiates all directive
       * instances.
       *
       * @param {Vue} vm
       * @param {Element|DocumentFragment} el
       * @param {Vue} [host] - host vm of transcluded content
       * @param {Object} [scope] - v-for scope
       * @param {Fragment} [frag] - link context fragment
       * @return {Function|undefined}
       */
  
      return function compositeLinkFn(vm, el, host, scope, frag) {
        // cache childNodes before linking parent, fix #657
        var childNodes = toArray(el.childNodes);
        // link
        var dirs = linkAndCapture(function compositeLinkCapturer() {
          if (nodeLinkFn) nodeLinkFn(vm, el, host, scope, frag);
          if (childLinkFn) childLinkFn(vm, childNodes, host, scope, frag);
        }, vm);
        return makeUnlinkFn(vm, dirs);
      };
    }
  
    /**
     * Apply a linker to a vm/element pair and capture the
     * directives created during the process.
     *
     * @param {Function} linker
     * @param {Vue} vm
     */
  
    function linkAndCapture(linker, vm) {
      /* istanbul ignore if */
      if ('development' === 'production') {}
      var originalDirCount = vm._directives.length;
      linker();
      var dirs = vm._directives.slice(originalDirCount);
      dirs.sort(directiveComparator);
      for (var i = 0, l = dirs.length; i < l; i++) {
        dirs[i]._bind();
      }
      return dirs;
    }
  
    /**
     * Directive priority sort comparator
     *
     * @param {Object} a
     * @param {Object} b
     */
  
    function directiveComparator(a, b) {
      a = a.descriptor.def.priority || DEFAULT_PRIORITY;
      b = b.descriptor.def.priority || DEFAULT_PRIORITY;
      return a > b ? -1 : a === b ? 0 : 1;
    }
  
    /**
     * Linker functions return an unlink function that
     * tearsdown all directives instances generated during
     * the process.
     *
     * We create unlink functions with only the necessary
     * information to avoid retaining additional closures.
     *
     * @param {Vue} vm
     * @param {Array} dirs
     * @param {Vue} [context]
     * @param {Array} [contextDirs]
     * @return {Function}
     */
  
    function makeUnlinkFn(vm, dirs, context, contextDirs) {
      function unlink(destroying) {
        teardownDirs(vm, dirs, destroying);
        if (context && contextDirs) {
          teardownDirs(context, contextDirs);
        }
      }
      // expose linked directives
      unlink.dirs = dirs;
      return unlink;
    }
  
    /**
     * Teardown partial linked directives.
     *
     * @param {Vue} vm
     * @param {Array} dirs
     * @param {Boolean} destroying
     */
  
    function teardownDirs(vm, dirs, destroying) {
      var i = dirs.length;
      while (i--) {
        dirs[i]._teardown();
        if ('development' !== 'production' && !destroying) {
          vm._directives.$remove(dirs[i]);
        }
      }
    }
  
    /**
     * Compile link props on an instance.
     *
     * @param {Vue} vm
     * @param {Element} el
     * @param {Object} props
     * @param {Object} [scope]
     * @return {Function}
     */
  
    function compileAndLinkProps(vm, el, props, scope) {
      var propsLinkFn = compileProps(el, props, vm);
      var propDirs = linkAndCapture(function () {
        propsLinkFn(vm, scope);
      }, vm);
      return makeUnlinkFn(vm, propDirs);
    }
  
    /**
     * Compile the root element of an instance.
     *
     * 1. attrs on context container (context scope)
     * 2. attrs on the component template root node, if
     *    replace:true (child scope)
     *
     * If this is a fragment instance, we only need to compile 1.
     *
     * @param {Element} el
     * @param {Object} options
     * @param {Object} contextOptions
     * @return {Function}
     */
  
    function compileRoot(el, options, contextOptions) {
      var containerAttrs = options._containerAttrs;
      var replacerAttrs = options._replacerAttrs;
      var contextLinkFn, replacerLinkFn;
  
      // only need to compile other attributes for
      // non-fragment instances
      if (el.nodeType !== 11) {
        // for components, container and replacer need to be
        // compiled separately and linked in different scopes.
        if (options._asComponent) {
          // 2. container attributes
          if (containerAttrs && contextOptions) {
            contextLinkFn = compileDirectives(containerAttrs, contextOptions);
          }
          if (replacerAttrs) {
            // 3. replacer attributes
            replacerLinkFn = compileDirectives(replacerAttrs, options);
          }
        } else {
          // non-component, just compile as a normal element.
          replacerLinkFn = compileDirectives(el.attributes, options);
        }
      } else if ('development' !== 'production' && containerAttrs) {
        // warn container directives for fragment instances
        var names = containerAttrs.filter(function (attr) {
          // allow vue-loader/vueify scoped css attributes
          return attr.name.indexOf('_v-') < 0 &&
          // allow event listeners
          !onRE.test(attr.name) &&
          // allow slots
          attr.name !== 'slot';
        }).map(function (attr) {
          return '"' + attr.name + '"';
        });
        if (names.length) {
          var plural = names.length > 1;
          warn('Attribute' + (plural ? 's ' : ' ') + names.join(', ') + (plural ? ' are' : ' is') + ' ignored on component ' + '<' + options.el.tagName.toLowerCase() + '> because ' + 'the component is a fragment instance: ' + 'http://vuejs.org/guide/components.html#Fragment-Instance');
        }
      }
  
      options._containerAttrs = options._replacerAttrs = null;
      return function rootLinkFn(vm, el, scope) {
        // link context scope dirs
        var context = vm._context;
        var contextDirs;
        if (context && contextLinkFn) {
          contextDirs = linkAndCapture(function () {
            contextLinkFn(context, el, null, scope);
          }, context);
        }
  
        // link self
        var selfDirs = linkAndCapture(function () {
          if (replacerLinkFn) replacerLinkFn(vm, el);
        }, vm);
  
        // return the unlink function that tearsdown context
        // container directives.
        return makeUnlinkFn(vm, selfDirs, context, contextDirs);
      };
    }
  
    /**
     * Compile a node and return a nodeLinkFn based on the
     * node type.
     *
     * @param {Node} node
     * @param {Object} options
     * @return {Function|null}
     */
  
    function compileNode(node, options) {
      var type = node.nodeType;
      if (type === 1 && !isScript(node)) {
        return compileElement(node, options);
      } else if (type === 3 && node.data.trim()) {
        return compileTextNode(node, options);
      } else {
        return null;
      }
    }
  
    /**
     * Compile an element and return a nodeLinkFn.
     *
     * @param {Element} el
     * @param {Object} options
     * @return {Function|null}
     */
  
    function compileElement(el, options) {
      // preprocess textareas.
      // textarea treats its text content as the initial value.
      // just bind it as an attr directive for value.
      if (el.tagName === 'TEXTAREA') {
        var tokens = parseText(el.value);
        if (tokens) {
          el.setAttribute(':value', tokensToExp(tokens));
          el.value = '';
        }
      }
      var linkFn;
      var hasAttrs = el.hasAttributes();
      var attrs = hasAttrs && toArray(el.attributes);
      // check terminal directives (for & if)
      if (hasAttrs) {
        linkFn = checkTerminalDirectives(el, attrs, options);
      }
      // check element directives
      if (!linkFn) {
        linkFn = checkElementDirectives(el, options);
      }
      // check component
      if (!linkFn) {
        linkFn = checkComponent(el, options);
      }
      // normal directives
      if (!linkFn && hasAttrs) {
        linkFn = compileDirectives(attrs, options);
      }
      return linkFn;
    }
  
    /**
     * Compile a textNode and return a nodeLinkFn.
     *
     * @param {TextNode} node
     * @param {Object} options
     * @return {Function|null} textNodeLinkFn
     */
  
    function compileTextNode(node, options) {
      // skip marked text nodes
      if (node._skip) {
        return removeText;
      }
  
      var tokens = parseText(node.wholeText);
      if (!tokens) {
        return null;
      }
  
      // mark adjacent text nodes as skipped,
      // because we are using node.wholeText to compile
      // all adjacent text nodes together. This fixes
      // issues in IE where sometimes it splits up a single
      // text node into multiple ones.
      var next = node.nextSibling;
      while (next && next.nodeType === 3) {
        next._skip = true;
        next = next.nextSibling;
      }
  
      var frag = document.createDocumentFragment();
      var el, token;
      for (var i = 0, l = tokens.length; i < l; i++) {
        token = tokens[i];
        el = token.tag ? processTextToken(token, options) : document.createTextNode(token.value);
        frag.appendChild(el);
      }
      return makeTextNodeLinkFn(tokens, frag, options);
    }
  
    /**
     * Linker for an skipped text node.
     *
     * @param {Vue} vm
     * @param {Text} node
     */
  
    function removeText(vm, node) {
      remove(node);
    }
  
    /**
     * Process a single text token.
     *
     * @param {Object} token
     * @param {Object} options
     * @return {Node}
     */
  
    function processTextToken(token, options) {
      var el;
      if (token.oneTime) {
        el = document.createTextNode(token.value);
      } else {
        if (token.html) {
          el = document.createComment('v-html');
          setTokenType('html');
        } else {
          // IE will clean up empty textNodes during
          // frag.cloneNode(true), so we have to give it
          // something here...
          el = document.createTextNode(' ');
          setTokenType('text');
        }
      }
      function setTokenType(type) {
        if (token.descriptor) return;
        var parsed = parseDirective(token.value);
        token.descriptor = {
          name: type,
          def: directives[type],
          expression: parsed.expression,
          filters: parsed.filters
        };
      }
      return el;
    }
  
    /**
     * Build a function that processes a textNode.
     *
     * @param {Array<Object>} tokens
     * @param {DocumentFragment} frag
     */
  
    function makeTextNodeLinkFn(tokens, frag) {
      return function textNodeLinkFn(vm, el, host, scope) {
        var fragClone = frag.cloneNode(true);
        var childNodes = toArray(fragClone.childNodes);
        var token, value, node;
        for (var i = 0, l = tokens.length; i < l; i++) {
          token = tokens[i];
          value = token.value;
          if (token.tag) {
            node = childNodes[i];
            if (token.oneTime) {
              value = (scope || vm).$eval(value);
              if (token.html) {
                replace(node, parseTemplate(value, true));
              } else {
                node.data = _toString(value);
              }
            } else {
              vm._bindDir(token.descriptor, node, host, scope);
            }
          }
        }
        replace(el, fragClone);
      };
    }
  
    /**
     * Compile a node list and return a childLinkFn.
     *
     * @param {NodeList} nodeList
     * @param {Object} options
     * @return {Function|undefined}
     */
  
    function compileNodeList(nodeList, options) {
      var linkFns = [];
      var nodeLinkFn, childLinkFn, node;
      for (var i = 0, l = nodeList.length; i < l; i++) {
        node = nodeList[i];
        nodeLinkFn = compileNode(node, options);
        childLinkFn = !(nodeLinkFn && nodeLinkFn.terminal) && node.tagName !== 'SCRIPT' && node.hasChildNodes() ? compileNodeList(node.childNodes, options) : null;
        linkFns.push(nodeLinkFn, childLinkFn);
      }
      return linkFns.length ? makeChildLinkFn(linkFns) : null;
    }
  
    /**
     * Make a child link function for a node's childNodes.
     *
     * @param {Array<Function>} linkFns
     * @return {Function} childLinkFn
     */
  
    function makeChildLinkFn(linkFns) {
      return function childLinkFn(vm, nodes, host, scope, frag) {
        var node, nodeLinkFn, childrenLinkFn;
        for (var i = 0, n = 0, l = linkFns.length; i < l; n++) {
          node = nodes[n];
          nodeLinkFn = linkFns[i++];
          childrenLinkFn = linkFns[i++];
          // cache childNodes before linking parent, fix #657
          var childNodes = toArray(node.childNodes);
          if (nodeLinkFn) {
            nodeLinkFn(vm, node, host, scope, frag);
          }
          if (childrenLinkFn) {
            childrenLinkFn(vm, childNodes, host, scope, frag);
          }
        }
      };
    }
  
    /**
     * Check for element directives (custom elements that should
     * be resovled as terminal directives).
     *
     * @param {Element} el
     * @param {Object} options
     */
  
    function checkElementDirectives(el, options) {
      var tag = el.tagName.toLowerCase();
      if (commonTagRE.test(tag)) {
        return;
      }
      var def = resolveAsset(options, 'elementDirectives', tag);
      if (def) {
        return makeTerminalNodeLinkFn(el, tag, '', options, def);
      }
    }
  
    /**
     * Check if an element is a component. If yes, return
     * a component link function.
     *
     * @param {Element} el
     * @param {Object} options
     * @return {Function|undefined}
     */
  
    function checkComponent(el, options) {
      var component = checkComponentAttr(el, options);
      if (component) {
        var ref = findRef(el);
        var descriptor = {
          name: 'component',
          ref: ref,
          expression: component.id,
          def: internalDirectives.component,
          modifiers: {
            literal: !component.dynamic
          }
        };
        var componentLinkFn = function componentLinkFn(vm, el, host, scope, frag) {
          if (ref) {
            defineReactive((scope || vm).$refs, ref, null);
          }
          vm._bindDir(descriptor, el, host, scope, frag);
        };
        componentLinkFn.terminal = true;
        return componentLinkFn;
      }
    }
  
    /**
     * Check an element for terminal directives in fixed order.
     * If it finds one, return a terminal link function.
     *
     * @param {Element} el
     * @param {Array} attrs
     * @param {Object} options
     * @return {Function} terminalLinkFn
     */
  
    function checkTerminalDirectives(el, attrs, options) {
      // skip v-pre
      if (getAttr(el, 'v-pre') !== null) {
        return skip;
      }
      // skip v-else block, but only if following v-if
      if (el.hasAttribute('v-else')) {
        var prev = el.previousElementSibling;
        if (prev && prev.hasAttribute('v-if')) {
          return skip;
        }
      }
  
      var attr, name, value, modifiers, matched, dirName, rawName, arg, def, termDef;
      for (var i = 0, j = attrs.length; i < j; i++) {
        attr = attrs[i];
        name = attr.name.replace(modifierRE, '');
        if (matched = name.match(dirAttrRE)) {
          def = resolveAsset(options, 'directives', matched[1]);
          if (def && def.terminal) {
            if (!termDef || (def.priority || DEFAULT_TERMINAL_PRIORITY) > termDef.priority) {
              termDef = def;
              rawName = attr.name;
              modifiers = parseModifiers(attr.name);
              value = attr.value;
              dirName = matched[1];
              arg = matched[2];
            }
          }
        }
      }
  
      if (termDef) {
        return makeTerminalNodeLinkFn(el, dirName, value, options, termDef, rawName, arg, modifiers);
      }
    }
  
    function skip() {}
    skip.terminal = true;
  
    /**
     * Build a node link function for a terminal directive.
     * A terminal link function terminates the current
     * compilation recursion and handles compilation of the
     * subtree in the directive.
     *
     * @param {Element} el
     * @param {String} dirName
     * @param {String} value
     * @param {Object} options
     * @param {Object} def
     * @param {String} [rawName]
     * @param {String} [arg]
     * @param {Object} [modifiers]
     * @return {Function} terminalLinkFn
     */
  
    function makeTerminalNodeLinkFn(el, dirName, value, options, def, rawName, arg, modifiers) {
      var parsed = parseDirective(value);
      var descriptor = {
        name: dirName,
        arg: arg,
        expression: parsed.expression,
        filters: parsed.filters,
        raw: value,
        attr: rawName,
        modifiers: modifiers,
        def: def
      };
      // check ref for v-for and router-view
      if (dirName === 'for' || dirName === 'router-view') {
        descriptor.ref = findRef(el);
      }
      var fn = function terminalNodeLinkFn(vm, el, host, scope, frag) {
        if (descriptor.ref) {
          defineReactive((scope || vm).$refs, descriptor.ref, null);
        }
        vm._bindDir(descriptor, el, host, scope, frag);
      };
      fn.terminal = true;
      return fn;
    }
  
    /**
     * Compile the directives on an element and return a linker.
     *
     * @param {Array|NamedNodeMap} attrs
     * @param {Object} options
     * @return {Function}
     */
  
    function compileDirectives(attrs, options) {
      var i = attrs.length;
      var dirs = [];
      var attr, name, value, rawName, rawValue, dirName, arg, modifiers, dirDef, tokens, matched;
      while (i--) {
        attr = attrs[i];
        name = rawName = attr.name;
        value = rawValue = attr.value;
        tokens = parseText(value);
        // reset arg
        arg = null;
        // check modifiers
        modifiers = parseModifiers(name);
        name = name.replace(modifierRE, '');
  
        // attribute interpolations
        if (tokens) {
          value = tokensToExp(tokens);
          arg = name;
          pushDir('bind', directives.bind, tokens);
          // warn against mixing mustaches with v-bind
          if ('development' !== 'production') {
            if (name === 'class' && Array.prototype.some.call(attrs, function (attr) {
              return attr.name === ':class' || attr.name === 'v-bind:class';
            })) {
              warn('class="' + rawValue + '": Do not mix mustache interpolation ' + 'and v-bind for "class" on the same element. Use one or the other.', options);
            }
          }
        } else
  
          // special attribute: transition
          if (transitionRE.test(name)) {
            modifiers.literal = !bindRE.test(name);
            pushDir('transition', internalDirectives.transition);
          } else
  
            // event handlers
            if (onRE.test(name)) {
              arg = name.replace(onRE, '');
              pushDir('on', directives.on);
            } else
  
              // attribute bindings
              if (bindRE.test(name)) {
                dirName = name.replace(bindRE, '');
                if (dirName === 'style' || dirName === 'class') {
                  pushDir(dirName, internalDirectives[dirName]);
                } else {
                  arg = dirName;
                  pushDir('bind', directives.bind);
                }
              } else
  
                // normal directives
                if (matched = name.match(dirAttrRE)) {
                  dirName = matched[1];
                  arg = matched[2];
  
                  // skip v-else (when used with v-show)
                  if (dirName === 'else') {
                    continue;
                  }
  
                  dirDef = resolveAsset(options, 'directives', dirName, true);
                  if (dirDef) {
                    pushDir(dirName, dirDef);
                  }
                }
      }
  
      /**
       * Push a directive.
       *
       * @param {String} dirName
       * @param {Object|Function} def
       * @param {Array} [interpTokens]
       */
  
      function pushDir(dirName, def, interpTokens) {
        var hasOneTimeToken = interpTokens && hasOneTime(interpTokens);
        var parsed = !hasOneTimeToken && parseDirective(value);
        dirs.push({
          name: dirName,
          attr: rawName,
          raw: rawValue,
          def: def,
          arg: arg,
          modifiers: modifiers,
          // conversion from interpolation strings with one-time token
          // to expression is differed until directive bind time so that we
          // have access to the actual vm context for one-time bindings.
          expression: parsed && parsed.expression,
          filters: parsed && parsed.filters,
          interp: interpTokens,
          hasOneTime: hasOneTimeToken
        });
      }
  
      if (dirs.length) {
        return makeNodeLinkFn(dirs);
      }
    }
  
    /**
     * Parse modifiers from directive attribute name.
     *
     * @param {String} name
     * @return {Object}
     */
  
    function parseModifiers(name) {
      var res = Object.create(null);
      var match = name.match(modifierRE);
      if (match) {
        var i = match.length;
        while (i--) {
          res[match[i].slice(1)] = true;
        }
      }
      return res;
    }
  
    /**
     * Build a link function for all directives on a single node.
     *
     * @param {Array} directives
     * @return {Function} directivesLinkFn
     */
  
    function makeNodeLinkFn(directives) {
      return function nodeLinkFn(vm, el, host, scope, frag) {
        // reverse apply because it's sorted low to high
        var i = directives.length;
        while (i--) {
          vm._bindDir(directives[i], el, host, scope, frag);
        }
      };
    }
  
    /**
     * Check if an interpolation string contains one-time tokens.
     *
     * @param {Array} tokens
     * @return {Boolean}
     */
  
    function hasOneTime(tokens) {
      var i = tokens.length;
      while (i--) {
        if (tokens[i].oneTime) return true;
      }
    }
  
    function isScript(el) {
      return el.tagName === 'SCRIPT' && (!el.hasAttribute('type') || el.getAttribute('type') === 'text/javascript');
    }
  
    var specialCharRE = /[^\w\-:\.]/;
  
    /**
     * Process an element or a DocumentFragment based on a
     * instance option object. This allows us to transclude
     * a template node/fragment before the instance is created,
     * so the processed fragment can then be cloned and reused
     * in v-for.
     *
     * @param {Element} el
     * @param {Object} options
     * @return {Element|DocumentFragment}
     */
  
    function transclude(el, options) {
      // extract container attributes to pass them down
      // to compiler, because they need to be compiled in
      // parent scope. we are mutating the options object here
      // assuming the same object will be used for compile
      // right after this.
      if (options) {
        options._containerAttrs = extractAttrs(el);
      }
      // for template tags, what we want is its content as
      // a documentFragment (for fragment instances)
      if (isTemplate(el)) {
        el = parseTemplate(el);
      }
      if (options) {
        if (options._asComponent && !options.template) {
          options.template = '<slot></slot>';
        }
        if (options.template) {
          options._content = extractContent(el);
          el = transcludeTemplate(el, options);
        }
      }
      if (isFragment(el)) {
        // anchors for fragment instance
        // passing in `persist: true` to avoid them being
        // discarded by IE during template cloning
        prepend(createAnchor('v-start', true), el);
        el.appendChild(createAnchor('v-end', true));
      }
      return el;
    }
  
    /**
     * Process the template option.
     * If the replace option is true this will swap the $el.
     *
     * @param {Element} el
     * @param {Object} options
     * @return {Element|DocumentFragment}
     */
  
    function transcludeTemplate(el, options) {
      var template = options.template;
      var frag = parseTemplate(template, true);
      if (frag) {
        var replacer = frag.firstChild;
        var tag = replacer.tagName && replacer.tagName.toLowerCase();
        if (options.replace) {
          /* istanbul ignore if */
          if (el === document.body) {
            'development' !== 'production' && warn('You are mounting an instance with a template to ' + '<body>. This will replace <body> entirely. You ' + 'should probably use `replace: false` here.');
          }
          // there are many cases where the instance must
          // become a fragment instance: basically anything that
          // can create more than 1 root nodes.
          if (
          // multi-children template
          frag.childNodes.length > 1 ||
          // non-element template
          replacer.nodeType !== 1 ||
          // single nested component
          tag === 'component' || resolveAsset(options, 'components', tag) || hasBindAttr(replacer, 'is') ||
          // element directive
          resolveAsset(options, 'elementDirectives', tag) ||
          // for block
          replacer.hasAttribute('v-for') ||
          // if block
          replacer.hasAttribute('v-if')) {
            return frag;
          } else {
            options._replacerAttrs = extractAttrs(replacer);
            mergeAttrs(el, replacer);
            return replacer;
          }
        } else {
          el.appendChild(frag);
          return el;
        }
      } else {
        'development' !== 'production' && warn('Invalid template option: ' + template);
      }
    }
  
    /**
     * Helper to extract a component container's attributes
     * into a plain object array.
     *
     * @param {Element} el
     * @return {Array}
     */
  
    function extractAttrs(el) {
      if (el.nodeType === 1 && el.hasAttributes()) {
        return toArray(el.attributes);
      }
    }
  
    /**
     * Merge the attributes of two elements, and make sure
     * the class names are merged properly.
     *
     * @param {Element} from
     * @param {Element} to
     */
  
    function mergeAttrs(from, to) {
      var attrs = from.attributes;
      var i = attrs.length;
      var name, value;
      while (i--) {
        name = attrs[i].name;
        value = attrs[i].value;
        if (!to.hasAttribute(name) && !specialCharRE.test(name)) {
          to.setAttribute(name, value);
        } else if (name === 'class' && !parseText(value) && (value = value.trim())) {
          value.split(/\s+/).forEach(function (cls) {
            addClass(to, cls);
          });
        }
      }
    }
  
    /**
     * Scan and determine slot content distribution.
     * We do this during transclusion instead at compile time so that
     * the distribution is decoupled from the compilation order of
     * the slots.
     *
     * @param {Element|DocumentFragment} template
     * @param {Element} content
     * @param {Vue} vm
     */
  
    function resolveSlots(vm, content) {
      if (!content) {
        return;
      }
      var contents = vm._slotContents = Object.create(null);
      var el, name;
      for (var i = 0, l = content.children.length; i < l; i++) {
        el = content.children[i];
        /* eslint-disable no-cond-assign */
        if (name = el.getAttribute('slot')) {
          (contents[name] || (contents[name] = [])).push(el);
        }
        /* eslint-enable no-cond-assign */
        if ('development' !== 'production' && getBindAttr(el, 'slot')) {
          warn('The "slot" attribute must be static.', vm.$parent);
        }
      }
      for (name in contents) {
        contents[name] = extractFragment(contents[name], content);
      }
      if (content.hasChildNodes()) {
        var nodes = content.childNodes;
        if (nodes.length === 1 && nodes[0].nodeType === 3 && !nodes[0].data.trim()) {
          return;
        }
        contents['default'] = extractFragment(content.childNodes, content);
      }
    }
  
    /**
     * Extract qualified content nodes from a node list.
     *
     * @param {NodeList} nodes
     * @return {DocumentFragment}
     */
  
    function extractFragment(nodes, parent) {
      var frag = document.createDocumentFragment();
      nodes = toArray(nodes);
      for (var i = 0, l = nodes.length; i < l; i++) {
        var node = nodes[i];
        if (isTemplate(node) && !node.hasAttribute('v-if') && !node.hasAttribute('v-for')) {
          parent.removeChild(node);
          node = parseTemplate(node, true);
        }
        frag.appendChild(node);
      }
      return frag;
    }
  
  
  
    var compiler = Object.freeze({
      compile: compile,
      compileAndLinkProps: compileAndLinkProps,
      compileRoot: compileRoot,
      transclude: transclude,
      resolveSlots: resolveSlots
    });
  
    function stateMixin (Vue) {
      /**
       * Accessor for `$data` property, since setting $data
       * requires observing the new object and updating
       * proxied properties.
       */
  
      Object.defineProperty(Vue.prototype, '$data', {
        get: function get() {
          return this._data;
        },
        set: function set(newData) {
          if (newData !== this._data) {
            this._setData(newData);
          }
        }
      });
  
      /**
       * Setup the scope of an instance, which contains:
       * - observed data
       * - computed properties
       * - user methods
       * - meta properties
       */
  
      Vue.prototype._initState = function () {
        this._initProps();
        this._initMeta();
        this._initMethods();
        this._initData();
        this._initComputed();
      };
  
      /**
       * Initialize props.
       */
  
      Vue.prototype._initProps = function () {
        var options = this.$options;
        var el = options.el;
        var props = options.props;
        if (props && !el) {
          'development' !== 'production' && warn('Props will not be compiled if no `el` option is ' + 'provided at instantiation.', this);
        }
        // make sure to convert string selectors into element now
        el = options.el = query(el);
        this._propsUnlinkFn = el && el.nodeType === 1 && props
        // props must be linked in proper scope if inside v-for
        ? compileAndLinkProps(this, el, props, this._scope) : null;
      };
  
      /**
       * Initialize the data.
       */
  
      Vue.prototype._initData = function () {
        var dataFn = this.$options.data;
        var data = this._data = dataFn ? dataFn() : {};
        if (!isPlainObject(data)) {
          data = {};
          'development' !== 'production' && warn('data functions should return an object.', this);
        }
        var props = this._props;
        // proxy data on instance
        var keys = Object.keys(data);
        var i, key;
        i = keys.length;
        while (i--) {
          key = keys[i];
          // there are two scenarios where we can proxy a data key:
          // 1. it's not already defined as a prop
          // 2. it's provided via a instantiation option AND there are no
          //    template prop present
          if (!props || !hasOwn(props, key)) {
            this._proxy(key);
          } else if ('development' !== 'production') {
            warn('Data field "' + key + '" is already defined ' + 'as a prop. To provide default value for a prop, use the "default" ' + 'prop option; if you want to pass prop values to an instantiation ' + 'call, use the "propsData" option.', this);
          }
        }
        // observe data
        observe(data, this);
      };
  
      /**
       * Swap the instance's $data. Called in $data's setter.
       *
       * @param {Object} newData
       */
  
      Vue.prototype._setData = function (newData) {
        newData = newData || {};
        var oldData = this._data;
        this._data = newData;
        var keys, key, i;
        // unproxy keys not present in new data
        keys = Object.keys(oldData);
        i = keys.length;
        while (i--) {
          key = keys[i];
          if (!(key in newData)) {
            this._unproxy(key);
          }
        }
        // proxy keys not already proxied,
        // and trigger change for changed values
        keys = Object.keys(newData);
        i = keys.length;
        while (i--) {
          key = keys[i];
          if (!hasOwn(this, key)) {
            // new property
            this._proxy(key);
          }
        }
        oldData.__ob__.removeVm(this);
        observe(newData, this);
        this._digest();
      };
  
      /**
       * Proxy a property, so that
       * vm.prop === vm._data.prop
       *
       * @param {String} key
       */
  
      Vue.prototype._proxy = function (key) {
        if (!isReserved(key)) {
          // need to store ref to self here
          // because these getter/setters might
          // be called by child scopes via
          // prototype inheritance.
          var self = this;
          Object.defineProperty(self, key, {
            configurable: true,
            enumerable: true,
            get: function proxyGetter() {
              return self._data[key];
            },
            set: function proxySetter(val) {
              self._data[key] = val;
            }
          });
        }
      };
  
      /**
       * Unproxy a property.
       *
       * @param {String} key
       */
  
      Vue.prototype._unproxy = function (key) {
        if (!isReserved(key)) {
          delete this[key];
        }
      };
  
      /**
       * Force update on every watcher in scope.
       */
  
      Vue.prototype._digest = function () {
        for (var i = 0, l = this._watchers.length; i < l; i++) {
          this._watchers[i].update(true); // shallow updates
        }
      };
  
      /**
       * Setup computed properties. They are essentially
       * special getter/setters
       */
  
      function noop() {}
      Vue.prototype._initComputed = function () {
        var computed = this.$options.computed;
        if (computed) {
          for (var key in computed) {
            var userDef = computed[key];
            var def = {
              enumerable: true,
              configurable: true
            };
            if (typeof userDef === 'function') {
              def.get = makeComputedGetter(userDef, this);
              def.set = noop;
            } else {
              def.get = userDef.get ? userDef.cache !== false ? makeComputedGetter(userDef.get, this) : bind(userDef.get, this) : noop;
              def.set = userDef.set ? bind(userDef.set, this) : noop;
            }
            Object.defineProperty(this, key, def);
          }
        }
      };
  
      function makeComputedGetter(getter, owner) {
        var watcher = new Watcher(owner, getter, null, {
          lazy: true
        });
        return function computedGetter() {
          if (watcher.dirty) {
            watcher.evaluate();
          }
          if (Dep.target) {
            watcher.depend();
          }
          return watcher.value;
        };
      }
  
      /**
       * Setup instance methods. Methods must be bound to the
       * instance since they might be passed down as a prop to
       * child components.
       */
  
      Vue.prototype._initMethods = function () {
        var methods = this.$options.methods;
        if (methods) {
          for (var key in methods) {
            this[key] = bind(methods[key], this);
          }
        }
      };
  
      /**
       * Initialize meta information like $index, $key & $value.
       */
  
      Vue.prototype._initMeta = function () {
        var metas = this.$options._meta;
        if (metas) {
          for (var key in metas) {
            defineReactive(this, key, metas[key]);
          }
        }
      };
    }
  
    var eventRE = /^v-on:|^@/;
  
    function eventsMixin (Vue) {
      /**
       * Setup the instance's option events & watchers.
       * If the value is a string, we pull it from the
       * instance's methods by name.
       */
  
      Vue.prototype._initEvents = function () {
        var options = this.$options;
        if (options._asComponent) {
          registerComponentEvents(this, options.el);
        }
        registerCallbacks(this, '$on', options.events);
        registerCallbacks(this, '$watch', options.watch);
      };
  
      /**
       * Register v-on events on a child component
       *
       * @param {Vue} vm
       * @param {Element} el
       */
  
      function registerComponentEvents(vm, el) {
        var attrs = el.attributes;
        var name, value, handler;
        for (var i = 0, l = attrs.length; i < l; i++) {
          name = attrs[i].name;
          if (eventRE.test(name)) {
            name = name.replace(eventRE, '');
            // force the expression into a statement so that
            // it always dynamically resolves the method to call (#2670)
            // kinda ugly hack, but does the job.
            value = attrs[i].value;
            if (isSimplePath(value)) {
              value += '.apply(this, $arguments)';
            }
            handler = (vm._scope || vm._context).$eval(value, true);
            handler._fromParent = true;
            vm.$on(name.replace(eventRE), handler);
          }
        }
      }
  
      /**
       * Register callbacks for option events and watchers.
       *
       * @param {Vue} vm
       * @param {String} action
       * @param {Object} hash
       */
  
      function registerCallbacks(vm, action, hash) {
        if (!hash) return;
        var handlers, key, i, j;
        for (key in hash) {
          handlers = hash[key];
          if (isArray(handlers)) {
            for (i = 0, j = handlers.length; i < j; i++) {
              register(vm, action, key, handlers[i]);
            }
          } else {
            register(vm, action, key, handlers);
          }
        }
      }
  
      /**
       * Helper to register an event/watch callback.
       *
       * @param {Vue} vm
       * @param {String} action
       * @param {String} key
       * @param {Function|String|Object} handler
       * @param {Object} [options]
       */
  
      function register(vm, action, key, handler, options) {
        var type = typeof handler;
        if (type === 'function') {
          vm[action](key, handler, options);
        } else if (type === 'string') {
          var methods = vm.$options.methods;
          var method = methods && methods[handler];
          if (method) {
            vm[action](key, method, options);
          } else {
            'development' !== 'production' && warn('Unknown method: "' + handler + '" when ' + 'registering callback for ' + action + ': "' + key + '".', vm);
          }
        } else if (handler && type === 'object') {
          register(vm, action, key, handler.handler, handler);
        }
      }
  
      /**
       * Setup recursive attached/detached calls
       */
  
      Vue.prototype._initDOMHooks = function () {
        this.$on('hook:attached', onAttached);
        this.$on('hook:detached', onDetached);
      };
  
      /**
       * Callback to recursively call attached hook on children
       */
  
      function onAttached() {
        if (!this._isAttached) {
          this._isAttached = true;
          this.$children.forEach(callAttach);
        }
      }
  
      /**
       * Iterator to call attached hook
       *
       * @param {Vue} child
       */
  
      function callAttach(child) {
        if (!child._isAttached && inDoc(child.$el)) {
          child._callHook('attached');
        }
      }
  
      /**
       * Callback to recursively call detached hook on children
       */
  
      function onDetached() {
        if (this._isAttached) {
          this._isAttached = false;
          this.$children.forEach(callDetach);
        }
      }
  
      /**
       * Iterator to call detached hook
       *
       * @param {Vue} child
       */
  
      function callDetach(child) {
        if (child._isAttached && !inDoc(child.$el)) {
          child._callHook('detached');
        }
      }
  
      /**
       * Trigger all handlers for a hook
       *
       * @param {String} hook
       */
  
      Vue.prototype._callHook = function (hook) {
        this.$emit('pre-hook:' + hook);
        var handlers = this.$options[hook];
        if (handlers) {
          for (var i = 0, j = handlers.length; i < j; i++) {
            handlers[i].call(this);
          }
        }
        this.$emit('hook:' + hook);
      };
    }
  
    function noop$1() {}
  
    /**
     * A directive links a DOM element with a piece of data,
     * which is the result of evaluating an expression.
     * It registers a watcher with the expression and calls
     * the DOM update function when a change is triggered.
     *
     * @param {Object} descriptor
     *                 - {String} name
     *                 - {Object} def
     *                 - {String} expression
     *                 - {Array<Object>} [filters]
     *                 - {Object} [modifiers]
     *                 - {Boolean} literal
     *                 - {String} attr
     *                 - {String} arg
     *                 - {String} raw
     *                 - {String} [ref]
     *                 - {Array<Object>} [interp]
     *                 - {Boolean} [hasOneTime]
     * @param {Vue} vm
     * @param {Node} el
     * @param {Vue} [host] - transclusion host component
     * @param {Object} [scope] - v-for scope
     * @param {Fragment} [frag] - owner fragment
     * @constructor
     */
    function Directive(descriptor, vm, el, host, scope, frag) {
      this.vm = vm;
      this.el = el;
      // copy descriptor properties
      this.descriptor = descriptor;
      this.name = descriptor.name;
      this.expression = descriptor.expression;
      this.arg = descriptor.arg;
      this.modifiers = descriptor.modifiers;
      this.filters = descriptor.filters;
      this.literal = this.modifiers && this.modifiers.literal;
      // private
      this._locked = false;
      this._bound = false;
      this._listeners = null;
      // link context
      this._host = host;
      this._scope = scope;
      this._frag = frag;
      // store directives on node in dev mode
      if ('development' !== 'production' && this.el) {
        this.el._vue_directives = this.el._vue_directives || [];
        this.el._vue_directives.push(this);
      }
    }
  
    /**
     * Initialize the directive, mixin definition properties,
     * setup the watcher, call definition bind() and update()
     * if present.
     */
  
    Directive.prototype._bind = function () {
      var name = this.name;
      var descriptor = this.descriptor;
  
      // remove attribute
      if ((name !== 'cloak' || this.vm._isCompiled) && this.el && this.el.removeAttribute) {
        var attr = descriptor.attr || 'v-' + name;
        this.el.removeAttribute(attr);
      }
  
      // copy def properties
      var def = descriptor.def;
      if (typeof def === 'function') {
        this.update = def;
      } else {
        extend(this, def);
      }
  
      // setup directive params
      this._setupParams();
  
      // initial bind
      if (this.bind) {
        this.bind();
      }
      this._bound = true;
  
      if (this.literal) {
        this.update && this.update(descriptor.raw);
      } else if ((this.expression || this.modifiers) && (this.update || this.twoWay) && !this._checkStatement()) {
        // wrapped updater for context
        var dir = this;
        if (this.update) {
          this._update = function (val, oldVal) {
            if (!dir._locked) {
              dir.update(val, oldVal);
            }
          };
        } else {
          this._update = noop$1;
        }
        var preProcess = this._preProcess ? bind(this._preProcess, this) : null;
        var postProcess = this._postProcess ? bind(this._postProcess, this) : null;
        var watcher = this._watcher = new Watcher(this.vm, this.expression, this._update, // callback
        {
          filters: this.filters,
          twoWay: this.twoWay,
          deep: this.deep,
          preProcess: preProcess,
          postProcess: postProcess,
          scope: this._scope
        });
        // v-model with inital inline value need to sync back to
        // model instead of update to DOM on init. They would
        // set the afterBind hook to indicate that.
        if (this.afterBind) {
          this.afterBind();
        } else if (this.update) {
          this.update(watcher.value);
        }
      }
    };
  
    /**
     * Setup all param attributes, e.g. track-by,
     * transition-mode, etc...
     */
  
    Directive.prototype._setupParams = function () {
      if (!this.params) {
        return;
      }
      var params = this.params;
      // swap the params array with a fresh object.
      this.params = Object.create(null);
      var i = params.length;
      var key, val, mappedKey;
      while (i--) {
        key = hyphenate(params[i]);
        mappedKey = camelize(key);
        val = getBindAttr(this.el, key);
        if (val != null) {
          // dynamic
          this._setupParamWatcher(mappedKey, val);
        } else {
          // static
          val = getAttr(this.el, key);
          if (val != null) {
            this.params[mappedKey] = val === '' ? true : val;
          }
        }
      }
    };
  
    /**
     * Setup a watcher for a dynamic param.
     *
     * @param {String} key
     * @param {String} expression
     */
  
    Directive.prototype._setupParamWatcher = function (key, expression) {
      var self = this;
      var called = false;
      var unwatch = (this._scope || this.vm).$watch(expression, function (val, oldVal) {
        self.params[key] = val;
        // since we are in immediate mode,
        // only call the param change callbacks if this is not the first update.
        if (called) {
          var cb = self.paramWatchers && self.paramWatchers[key];
          if (cb) {
            cb.call(self, val, oldVal);
          }
        } else {
          called = true;
        }
      }, {
        immediate: true,
        user: false
      });(this._paramUnwatchFns || (this._paramUnwatchFns = [])).push(unwatch);
    };
  
    /**
     * Check if the directive is a function caller
     * and if the expression is a callable one. If both true,
     * we wrap up the expression and use it as the event
     * handler.
     *
     * e.g. on-click="a++"
     *
     * @return {Boolean}
     */
  
    Directive.prototype._checkStatement = function () {
      var expression = this.expression;
      if (expression && this.acceptStatement && !isSimplePath(expression)) {
        var fn = parseExpression(expression).get;
        var scope = this._scope || this.vm;
        var handler = function handler(e) {
          scope.$event = e;
          fn.call(scope, scope);
          scope.$event = null;
        };
        if (this.filters) {
          handler = scope._applyFilters(handler, null, this.filters);
        }
        this.update(handler);
        return true;
      }
    };
  
    /**
     * Set the corresponding value with the setter.
     * This should only be used in two-way directives
     * e.g. v-model.
     *
     * @param {*} value
     * @public
     */
  
    Directive.prototype.set = function (value) {
      /* istanbul ignore else */
      if (this.twoWay) {
        this._withLock(function () {
          this._watcher.set(value);
        });
      } else if ('development' !== 'production') {
        warn('Directive.set() can only be used inside twoWay' + 'directives.');
      }
    };
  
    /**
     * Execute a function while preventing that function from
     * triggering updates on this directive instance.
     *
     * @param {Function} fn
     */
  
    Directive.prototype._withLock = function (fn) {
      var self = this;
      self._locked = true;
      fn.call(self);
      nextTick(function () {
        self._locked = false;
      });
    };
  
    /**
     * Convenience method that attaches a DOM event listener
     * to the directive element and autometically tears it down
     * during unbind.
     *
     * @param {String} event
     * @param {Function} handler
     * @param {Boolean} [useCapture]
     */
  
    Directive.prototype.on = function (event, handler, useCapture) {
      on(this.el, event, handler, useCapture);(this._listeners || (this._listeners = [])).push([event, handler]);
    };
  
    /**
     * Teardown the watcher and call unbind.
     */
  
    Directive.prototype._teardown = function () {
      if (this._bound) {
        this._bound = false;
        if (this.unbind) {
          this.unbind();
        }
        if (this._watcher) {
          this._watcher.teardown();
        }
        var listeners = this._listeners;
        var i;
        if (listeners) {
          i = listeners.length;
          while (i--) {
            off(this.el, listeners[i][0], listeners[i][1]);
          }
        }
        var unwatchFns = this._paramUnwatchFns;
        if (unwatchFns) {
          i = unwatchFns.length;
          while (i--) {
            unwatchFns[i]();
          }
        }
        if ('development' !== 'production' && this.el) {
          this.el._vue_directives.$remove(this);
        }
        this.vm = this.el = this._watcher = this._listeners = null;
      }
    };
  
    function lifecycleMixin (Vue) {
      /**
       * Update v-ref for component.
       *
       * @param {Boolean} remove
       */
  
      Vue.prototype._updateRef = function (remove) {
        var ref = this.$options._ref;
        if (ref) {
          var refs = (this._scope || this._context).$refs;
          if (remove) {
            if (refs[ref] === this) {
              refs[ref] = null;
            }
          } else {
            refs[ref] = this;
          }
        }
      };
  
      /**
       * Transclude, compile and link element.
       *
       * If a pre-compiled linker is available, that means the
       * passed in element will be pre-transcluded and compiled
       * as well - all we need to do is to call the linker.
       *
       * Otherwise we need to call transclude/compile/link here.
       *
       * @param {Element} el
       */
  
      Vue.prototype._compile = function (el) {
        var options = this.$options;
  
        // transclude and init element
        // transclude can potentially replace original
        // so we need to keep reference; this step also injects
        // the template and caches the original attributes
        // on the container node and replacer node.
        var original = el;
        el = transclude(el, options);
        this._initElement(el);
  
        // handle v-pre on root node (#2026)
        if (el.nodeType === 1 && getAttr(el, 'v-pre') !== null) {
          return;
        }
  
        // root is always compiled per-instance, because
        // container attrs and props can be different every time.
        var contextOptions = this._context && this._context.$options;
        var rootLinker = compileRoot(el, options, contextOptions);
  
        // resolve slot distribution
        resolveSlots(this, options._content);
  
        // compile and link the rest
        var contentLinkFn;
        var ctor = this.constructor;
        // component compilation can be cached
        // as long as it's not using inline-template
        if (options._linkerCachable) {
          contentLinkFn = ctor.linker;
          if (!contentLinkFn) {
            contentLinkFn = ctor.linker = compile(el, options);
          }
        }
  
        // link phase
        // make sure to link root with prop scope!
        var rootUnlinkFn = rootLinker(this, el, this._scope);
        var contentUnlinkFn = contentLinkFn ? contentLinkFn(this, el) : compile(el, options)(this, el);
  
        // register composite unlink function
        // to be called during instance destruction
        this._unlinkFn = function () {
          rootUnlinkFn();
          // passing destroying: true to avoid searching and
          // splicing the directives
          contentUnlinkFn(true);
        };
  
        // finally replace original
        if (options.replace) {
          replace(original, el);
        }
  
        this._isCompiled = true;
        this._callHook('compiled');
      };
  
      /**
       * Initialize instance element. Called in the public
       * $mount() method.
       *
       * @param {Element} el
       */
  
      Vue.prototype._initElement = function (el) {
        if (isFragment(el)) {
          this._isFragment = true;
          this.$el = this._fragmentStart = el.firstChild;
          this._fragmentEnd = el.lastChild;
          // set persisted text anchors to empty
          if (this._fragmentStart.nodeType === 3) {
            this._fragmentStart.data = this._fragmentEnd.data = '';
          }
          this._fragment = el;
        } else {
          this.$el = el;
        }
        this.$el.__vue__ = this;
        this._callHook('beforeCompile');
      };
  
      /**
       * Create and bind a directive to an element.
       *
       * @param {Object} descriptor - parsed directive descriptor
       * @param {Node} node   - target node
       * @param {Vue} [host] - transclusion host component
       * @param {Object} [scope] - v-for scope
       * @param {Fragment} [frag] - owner fragment
       */
  
      Vue.prototype._bindDir = function (descriptor, node, host, scope, frag) {
        this._directives.push(new Directive(descriptor, this, node, host, scope, frag));
      };
  
      /**
       * Teardown an instance, unobserves the data, unbind all the
       * directives, turn off all the event listeners, etc.
       *
       * @param {Boolean} remove - whether to remove the DOM node.
       * @param {Boolean} deferCleanup - if true, defer cleanup to
       *                                 be called later
       */
  
      Vue.prototype._destroy = function (remove, deferCleanup) {
        if (this._isBeingDestroyed) {
          if (!deferCleanup) {
            this._cleanup();
          }
          return;
        }
  
        var destroyReady;
        var pendingRemoval;
  
        var self = this;
        // Cleanup should be called either synchronously or asynchronoysly as
        // callback of this.$remove(), or if remove and deferCleanup are false.
        // In any case it should be called after all other removing, unbinding and
        // turning of is done
        var cleanupIfPossible = function cleanupIfPossible() {
          if (destroyReady && !pendingRemoval && !deferCleanup) {
            self._cleanup();
          }
        };
  
        // remove DOM element
        if (remove && this.$el) {
          pendingRemoval = true;
          this.$remove(function () {
            pendingRemoval = false;
            cleanupIfPossible();
          });
        }
  
        this._callHook('beforeDestroy');
        this._isBeingDestroyed = true;
        var i;
        // remove self from parent. only necessary
        // if parent is not being destroyed as well.
        var parent = this.$parent;
        if (parent && !parent._isBeingDestroyed) {
          parent.$children.$remove(this);
          // unregister ref (remove: true)
          this._updateRef(true);
        }
        // destroy all children.
        i = this.$children.length;
        while (i--) {
          this.$children[i].$destroy();
        }
        // teardown props
        if (this._propsUnlinkFn) {
          this._propsUnlinkFn();
        }
        // teardown all directives. this also tearsdown all
        // directive-owned watchers.
        if (this._unlinkFn) {
          this._unlinkFn();
        }
        i = this._watchers.length;
        while (i--) {
          this._watchers[i].teardown();
        }
        // remove reference to self on $el
        if (this.$el) {
          this.$el.__vue__ = null;
        }
  
        destroyReady = true;
        cleanupIfPossible();
      };
  
      /**
       * Clean up to ensure garbage collection.
       * This is called after the leave transition if there
       * is any.
       */
  
      Vue.prototype._cleanup = function () {
        if (this._isDestroyed) {
          return;
        }
        // remove self from owner fragment
        // do it in cleanup so that we can call $destroy with
        // defer right when a fragment is about to be removed.
        if (this._frag) {
          this._frag.children.$remove(this);
        }
        // remove reference from data ob
        // frozen object may not have observer.
        if (this._data && this._data.__ob__) {
          this._data.__ob__.removeVm(this);
        }
        // Clean up references to private properties and other
        // instances. preserve reference to _data so that proxy
        // accessors still work. The only potential side effect
        // here is that mutating the instance after it's destroyed
        // may affect the state of other components that are still
        // observing the same object, but that seems to be a
        // reasonable responsibility for the user rather than
        // always throwing an error on them.
        this.$el = this.$parent = this.$root = this.$children = this._watchers = this._context = this._scope = this._directives = null;
        // call the last hook...
        this._isDestroyed = true;
        this._callHook('destroyed');
        // turn off all instance listeners.
        this.$off();
      };
    }
  
    function miscMixin (Vue) {
      /**
       * Apply a list of filter (descriptors) to a value.
       * Using plain for loops here because this will be called in
       * the getter of any watcher with filters so it is very
       * performance sensitive.
       *
       * @param {*} value
       * @param {*} [oldValue]
       * @param {Array} filters
       * @param {Boolean} write
       * @return {*}
       */
  
      Vue.prototype._applyFilters = function (value, oldValue, filters, write) {
        var filter, fn, args, arg, offset, i, l, j, k;
        for (i = 0, l = filters.length; i < l; i++) {
          filter = filters[write ? l - i - 1 : i];
          fn = resolveAsset(this.$options, 'filters', filter.name, true);
          if (!fn) continue;
          fn = write ? fn.write : fn.read || fn;
          if (typeof fn !== 'function') continue;
          args = write ? [value, oldValue] : [value];
          offset = write ? 2 : 1;
          if (filter.args) {
            for (j = 0, k = filter.args.length; j < k; j++) {
              arg = filter.args[j];
              args[j + offset] = arg.dynamic ? this.$get(arg.value) : arg.value;
            }
          }
          value = fn.apply(this, args);
        }
        return value;
      };
  
      /**
       * Resolve a component, depending on whether the component
       * is defined normally or using an async factory function.
       * Resolves synchronously if already resolved, otherwise
       * resolves asynchronously and caches the resolved
       * constructor on the factory.
       *
       * @param {String|Function} value
       * @param {Function} cb
       */
  
      Vue.prototype._resolveComponent = function (value, cb) {
        var factory;
        if (typeof value === 'function') {
          factory = value;
        } else {
          factory = resolveAsset(this.$options, 'components', value, true);
        }
        /* istanbul ignore if */
        if (!factory) {
          return;
        }
        // async component factory
        if (!factory.options) {
          if (factory.resolved) {
            // cached
            cb(factory.resolved);
          } else if (factory.requested) {
            // pool callbacks
            factory.pendingCallbacks.push(cb);
          } else {
            factory.requested = true;
            var cbs = factory.pendingCallbacks = [cb];
            factory.call(this, function resolve(res) {
              if (isPlainObject(res)) {
                res = Vue.extend(res);
              }
              // cache resolved
              factory.resolved = res;
              // invoke callbacks
              for (var i = 0, l = cbs.length; i < l; i++) {
                cbs[i](res);
              }
            }, function reject(reason) {
              'development' !== 'production' && warn('Failed to resolve async component' + (typeof value === 'string' ? ': ' + value : '') + '. ' + (reason ? '\nReason: ' + reason : ''));
            });
          }
        } else {
          // normal component
          cb(factory);
        }
      };
    }
  
    var filterRE$1 = /[^|]\|[^|]/;
  
    function dataAPI (Vue) {
      /**
       * Get the value from an expression on this vm.
       *
       * @param {String} exp
       * @param {Boolean} [asStatement]
       * @return {*}
       */
  
      Vue.prototype.$get = function (exp, asStatement) {
        var res = parseExpression(exp);
        if (res) {
          if (asStatement) {
            var self = this;
            return function statementHandler() {
              self.$arguments = toArray(arguments);
              var result = res.get.call(self, self);
              self.$arguments = null;
              return result;
            };
          } else {
            try {
              return res.get.call(this, this);
            } catch (e) {}
          }
        }
      };
  
      /**
       * Set the value from an expression on this vm.
       * The expression must be a valid left-hand
       * expression in an assignment.
       *
       * @param {String} exp
       * @param {*} val
       */
  
      Vue.prototype.$set = function (exp, val) {
        var res = parseExpression(exp, true);
        if (res && res.set) {
          res.set.call(this, this, val);
        }
      };
  
      /**
       * Delete a property on the VM
       *
       * @param {String} key
       */
  
      Vue.prototype.$delete = function (key) {
        del(this._data, key);
      };
  
      /**
       * Watch an expression, trigger callback when its
       * value changes.
       *
       * @param {String|Function} expOrFn
       * @param {Function} cb
       * @param {Object} [options]
       *                 - {Boolean} deep
       *                 - {Boolean} immediate
       * @return {Function} - unwatchFn
       */
  
      Vue.prototype.$watch = function (expOrFn, cb, options) {
        var vm = this;
        var parsed;
        if (typeof expOrFn === 'string') {
          parsed = parseDirective(expOrFn);
          expOrFn = parsed.expression;
        }
        var watcher = new Watcher(vm, expOrFn, cb, {
          deep: options && options.deep,
          sync: options && options.sync,
          filters: parsed && parsed.filters,
          user: !options || options.user !== false
        });
        if (options && options.immediate) {
          cb.call(vm, watcher.value);
        }
        return function unwatchFn() {
          watcher.teardown();
        };
      };
  
      /**
       * Evaluate a text directive, including filters.
       *
       * @param {String} text
       * @param {Boolean} [asStatement]
       * @return {String}
       */
  
      Vue.prototype.$eval = function (text, asStatement) {
        // check for filters.
        if (filterRE$1.test(text)) {
          var dir = parseDirective(text);
          // the filter regex check might give false positive
          // for pipes inside strings, so it's possible that
          // we don't get any filters here
          var val = this.$get(dir.expression, asStatement);
          return dir.filters ? this._applyFilters(val, null, dir.filters) : val;
        } else {
          // no filter
          return this.$get(text, asStatement);
        }
      };
  
      /**
       * Interpolate a piece of template text.
       *
       * @param {String} text
       * @return {String}
       */
  
      Vue.prototype.$interpolate = function (text) {
        var tokens = parseText(text);
        var vm = this;
        if (tokens) {
          if (tokens.length === 1) {
            return vm.$eval(tokens[0].value) + '';
          } else {
            return tokens.map(function (token) {
              return token.tag ? vm.$eval(token.value) : token.value;
            }).join('');
          }
        } else {
          return text;
        }
      };
  
      /**
       * Log instance data as a plain JS object
       * so that it is easier to inspect in console.
       * This method assumes console is available.
       *
       * @param {String} [path]
       */
  
      Vue.prototype.$log = function (path) {
        var data = path ? getPath(this._data, path) : this._data;
        if (data) {
          data = clean(data);
        }
        // include computed fields
        if (!path) {
          var key;
          for (key in this.$options.computed) {
            data[key] = clean(this[key]);
          }
          if (this._props) {
            for (key in this._props) {
              data[key] = clean(this[key]);
            }
          }
        }
        console.log(data);
      };
  
      /**
       * "clean" a getter/setter converted object into a plain
       * object copy.
       *
       * @param {Object} - obj
       * @return {Object}
       */
  
      function clean(obj) {
        return JSON.parse(JSON.stringify(obj));
      }
    }
  
    function domAPI (Vue) {
      /**
       * Convenience on-instance nextTick. The callback is
       * auto-bound to the instance, and this avoids component
       * modules having to rely on the global Vue.
       *
       * @param {Function} fn
       */
  
      Vue.prototype.$nextTick = function (fn) {
        nextTick(fn, this);
      };
  
      /**
       * Append instance to target
       *
       * @param {Node} target
       * @param {Function} [cb]
       * @param {Boolean} [withTransition] - defaults to true
       */
  
      Vue.prototype.$appendTo = function (target, cb, withTransition) {
        return insert(this, target, cb, withTransition, append, appendWithTransition);
      };
  
      /**
       * Prepend instance to target
       *
       * @param {Node} target
       * @param {Function} [cb]
       * @param {Boolean} [withTransition] - defaults to true
       */
  
      Vue.prototype.$prependTo = function (target, cb, withTransition) {
        target = query(target);
        if (target.hasChildNodes()) {
          this.$before(target.firstChild, cb, withTransition);
        } else {
          this.$appendTo(target, cb, withTransition);
        }
        return this;
      };
  
      /**
       * Insert instance before target
       *
       * @param {Node} target
       * @param {Function} [cb]
       * @param {Boolean} [withTransition] - defaults to true
       */
  
      Vue.prototype.$before = function (target, cb, withTransition) {
        return insert(this, target, cb, withTransition, beforeWithCb, beforeWithTransition);
      };
  
      /**
       * Insert instance after target
       *
       * @param {Node} target
       * @param {Function} [cb]
       * @param {Boolean} [withTransition] - defaults to true
       */
  
      Vue.prototype.$after = function (target, cb, withTransition) {
        target = query(target);
        if (target.nextSibling) {
          this.$before(target.nextSibling, cb, withTransition);
        } else {
          this.$appendTo(target.parentNode, cb, withTransition);
        }
        return this;
      };
  
      /**
       * Remove instance from DOM
       *
       * @param {Function} [cb]
       * @param {Boolean} [withTransition] - defaults to true
       */
  
      Vue.prototype.$remove = function (cb, withTransition) {
        if (!this.$el.parentNode) {
          return cb && cb();
        }
        var inDocument = this._isAttached && inDoc(this.$el);
        // if we are not in document, no need to check
        // for transitions
        if (!inDocument) withTransition = false;
        var self = this;
        var realCb = function realCb() {
          if (inDocument) self._callHook('detached');
          if (cb) cb();
        };
        if (this._isFragment) {
          removeNodeRange(this._fragmentStart, this._fragmentEnd, this, this._fragment, realCb);
        } else {
          var op = withTransition === false ? removeWithCb : removeWithTransition;
          op(this.$el, this, realCb);
        }
        return this;
      };
  
      /**
       * Shared DOM insertion function.
       *
       * @param {Vue} vm
       * @param {Element} target
       * @param {Function} [cb]
       * @param {Boolean} [withTransition]
       * @param {Function} op1 - op for non-transition insert
       * @param {Function} op2 - op for transition insert
       * @return vm
       */
  
      function insert(vm, target, cb, withTransition, op1, op2) {
        target = query(target);
        var targetIsDetached = !inDoc(target);
        var op = withTransition === false || targetIsDetached ? op1 : op2;
        var shouldCallHook = !targetIsDetached && !vm._isAttached && !inDoc(vm.$el);
        if (vm._isFragment) {
          mapNodeRange(vm._fragmentStart, vm._fragmentEnd, function (node) {
            op(node, target, vm);
          });
          cb && cb();
        } else {
          op(vm.$el, target, vm, cb);
        }
        if (shouldCallHook) {
          vm._callHook('attached');
        }
        return vm;
      }
  
      /**
       * Check for selectors
       *
       * @param {String|Element} el
       */
  
      function query(el) {
        return typeof el === 'string' ? document.querySelector(el) : el;
      }
  
      /**
       * Append operation that takes a callback.
       *
       * @param {Node} el
       * @param {Node} target
       * @param {Vue} vm - unused
       * @param {Function} [cb]
       */
  
      function append(el, target, vm, cb) {
        target.appendChild(el);
        if (cb) cb();
      }
  
      /**
       * InsertBefore operation that takes a callback.
       *
       * @param {Node} el
       * @param {Node} target
       * @param {Vue} vm - unused
       * @param {Function} [cb]
       */
  
      function beforeWithCb(el, target, vm, cb) {
        before(el, target);
        if (cb) cb();
      }
  
      /**
       * Remove operation that takes a callback.
       *
       * @param {Node} el
       * @param {Vue} vm - unused
       * @param {Function} [cb]
       */
  
      function removeWithCb(el, vm, cb) {
        remove(el);
        if (cb) cb();
      }
    }
  
    function eventsAPI (Vue) {
      /**
       * Listen on the given `event` with `fn`.
       *
       * @param {String} event
       * @param {Function} fn
       */
  
      Vue.prototype.$on = function (event, fn) {
        (this._events[event] || (this._events[event] = [])).push(fn);
        modifyListenerCount(this, event, 1);
        return this;
      };
  
      /**
       * Adds an `event` listener that will be invoked a single
       * time then automatically removed.
       *
       * @param {String} event
       * @param {Function} fn
       */
  
      Vue.prototype.$once = function (event, fn) {
        var self = this;
        function on() {
          self.$off(event, on);
          fn.apply(this, arguments);
        }
        on.fn = fn;
        this.$on(event, on);
        return this;
      };
  
      /**
       * Remove the given callback for `event` or all
       * registered callbacks.
       *
       * @param {String} event
       * @param {Function} fn
       */
  
      Vue.prototype.$off = function (event, fn) {
        var cbs;
        // all
        if (!arguments.length) {
          if (this.$parent) {
            for (event in this._events) {
              cbs = this._events[event];
              if (cbs) {
                modifyListenerCount(this, event, -cbs.length);
              }
            }
          }
          this._events = {};
          return this;
        }
        // specific event
        cbs = this._events[event];
        if (!cbs) {
          return this;
        }
        if (arguments.length === 1) {
          modifyListenerCount(this, event, -cbs.length);
          this._events[event] = null;
          return this;
        }
        // specific handler
        var cb;
        var i = cbs.length;
        while (i--) {
          cb = cbs[i];
          if (cb === fn || cb.fn === fn) {
            modifyListenerCount(this, event, -1);
            cbs.splice(i, 1);
            break;
          }
        }
        return this;
      };
  
      /**
       * Trigger an event on self.
       *
       * @param {String|Object} event
       * @return {Boolean} shouldPropagate
       */
  
      Vue.prototype.$emit = function (event) {
        var isSource = typeof event === 'string';
        event = isSource ? event : event.name;
        var cbs = this._events[event];
        var shouldPropagate = isSource || !cbs;
        if (cbs) {
          cbs = cbs.length > 1 ? toArray(cbs) : cbs;
          // this is a somewhat hacky solution to the question raised
          // in #2102: for an inline component listener like <comp @test="doThis">,
          // the propagation handling is somewhat broken. Therefore we
          // need to treat these inline callbacks differently.
          var hasParentCbs = isSource && cbs.some(function (cb) {
            return cb._fromParent;
          });
          if (hasParentCbs) {
            shouldPropagate = false;
          }
          var args = toArray(arguments, 1);
          for (var i = 0, l = cbs.length; i < l; i++) {
            var cb = cbs[i];
            var res = cb.apply(this, args);
            if (res === true && (!hasParentCbs || cb._fromParent)) {
              shouldPropagate = true;
            }
          }
        }
        return shouldPropagate;
      };
  
      /**
       * Recursively broadcast an event to all children instances.
       *
       * @param {String|Object} event
       * @param {...*} additional arguments
       */
  
      Vue.prototype.$broadcast = function (event) {
        var isSource = typeof event === 'string';
        event = isSource ? event : event.name;
        // if no child has registered for this event,
        // then there's no need to broadcast.
        if (!this._eventsCount[event]) return;
        var children = this.$children;
        var args = toArray(arguments);
        if (isSource) {
          // use object event to indicate non-source emit
          // on children
          args[0] = { name: event, source: this };
        }
        for (var i = 0, l = children.length; i < l; i++) {
          var child = children[i];
          var shouldPropagate = child.$emit.apply(child, args);
          if (shouldPropagate) {
            child.$broadcast.apply(child, args);
          }
        }
        return this;
      };
  
      /**
       * Recursively propagate an event up the parent chain.
       *
       * @param {String} event
       * @param {...*} additional arguments
       */
  
      Vue.prototype.$dispatch = function (event) {
        var shouldPropagate = this.$emit.apply(this, arguments);
        if (!shouldPropagate) return;
        var parent = this.$parent;
        var args = toArray(arguments);
        // use object event to indicate non-source emit
        // on parents
        args[0] = { name: event, source: this };
        while (parent) {
          shouldPropagate = parent.$emit.apply(parent, args);
          parent = shouldPropagate ? parent.$parent : null;
        }
        return this;
      };
  
      /**
       * Modify the listener counts on all parents.
       * This bookkeeping allows $broadcast to return early when
       * no child has listened to a certain event.
       *
       * @param {Vue} vm
       * @param {String} event
       * @param {Number} count
       */
  
      var hookRE = /^hook:/;
      function modifyListenerCount(vm, event, count) {
        var parent = vm.$parent;
        // hooks do not get broadcasted so no need
        // to do bookkeeping for them
        if (!parent || !count || hookRE.test(event)) return;
        while (parent) {
          parent._eventsCount[event] = (parent._eventsCount[event] || 0) + count;
          parent = parent.$parent;
        }
      }
    }
  
    function lifecycleAPI (Vue) {
      /**
       * Set instance target element and kick off the compilation
       * process. The passed in `el` can be a selector string, an
       * existing Element, or a DocumentFragment (for block
       * instances).
       *
       * @param {Element|DocumentFragment|string} el
       * @public
       */
  
      Vue.prototype.$mount = function (el) {
        if (this._isCompiled) {
          'development' !== 'production' && warn('$mount() should be called only once.', this);
          return;
        }
        el = query(el);
        if (!el) {
          el = document.createElement('div');
        }
        this._compile(el);
        this._initDOMHooks();
        if (inDoc(this.$el)) {
          this._callHook('attached');
          ready.call(this);
        } else {
          this.$once('hook:attached', ready);
        }
        return this;
      };
  
      /**
       * Mark an instance as ready.
       */
  
      function ready() {
        this._isAttached = true;
        this._isReady = true;
        this._callHook('ready');
      }
  
      /**
       * Teardown the instance, simply delegate to the internal
       * _destroy.
       *
       * @param {Boolean} remove
       * @param {Boolean} deferCleanup
       */
  
      Vue.prototype.$destroy = function (remove, deferCleanup) {
        this._destroy(remove, deferCleanup);
      };
  
      /**
       * Partially compile a piece of DOM and return a
       * decompile function.
       *
       * @param {Element|DocumentFragment} el
       * @param {Vue} [host]
       * @param {Object} [scope]
       * @param {Fragment} [frag]
       * @return {Function}
       */
  
      Vue.prototype.$compile = function (el, host, scope, frag) {
        return compile(el, this.$options, true)(this, el, host, scope, frag);
      };
    }
  
    /**
     * The exposed Vue constructor.
     *
     * API conventions:
     * - public API methods/properties are prefixed with `$`
     * - internal methods/properties are prefixed with `_`
     * - non-prefixed properties are assumed to be proxied user
     *   data.
     *
     * @constructor
     * @param {Object} [options]
     * @public
     */
  
    function Vue(options) {
      this._init(options);
    }
  
    // install internals
    initMixin(Vue);
    stateMixin(Vue);
    eventsMixin(Vue);
    lifecycleMixin(Vue);
    miscMixin(Vue);
  
    // install instance APIs
    dataAPI(Vue);
    domAPI(Vue);
    eventsAPI(Vue);
    lifecycleAPI(Vue);
  
    var slot = {
  
      priority: SLOT,
      params: ['name'],
  
      bind: function bind() {
        // this was resolved during component transclusion
        var name = this.params.name || 'default';
        var content = this.vm._slotContents && this.vm._slotContents[name];
        if (!content || !content.hasChildNodes()) {
          this.fallback();
        } else {
          this.compile(content.cloneNode(true), this.vm._context, this.vm);
        }
      },
  
      compile: function compile(content, context, host) {
        if (content && context) {
          if (this.el.hasChildNodes() && content.childNodes.length === 1 && content.childNodes[0].nodeType === 1 && content.childNodes[0].hasAttribute('v-if')) {
            // if the inserted slot has v-if
            // inject fallback content as the v-else
            var elseBlock = document.createElement('template');
            elseBlock.setAttribute('v-else', '');
            elseBlock.innerHTML = this.el.innerHTML;
            // the else block should be compiled in child scope
            elseBlock._context = this.vm;
            content.appendChild(elseBlock);
          }
          var scope = host ? host._scope : this._scope;
          this.unlink = context.$compile(content, host, scope, this._frag);
        }
        if (content) {
          replace(this.el, content);
        } else {
          remove(this.el);
        }
      },
  
      fallback: function fallback() {
        this.compile(extractContent(this.el, true), this.vm);
      },
  
      unbind: function unbind() {
        if (this.unlink) {
          this.unlink();
        }
      }
    };
  
    var partial = {
  
      priority: PARTIAL,
  
      params: ['name'],
  
      // watch changes to name for dynamic partials
      paramWatchers: {
        name: function name(value) {
          vIf.remove.call(this);
          if (value) {
            this.insert(value);
          }
        }
      },
  
      bind: function bind() {
        this.anchor = createAnchor('v-partial');
        replace(this.el, this.anchor);
        this.insert(this.params.name);
      },
  
      insert: function insert(id) {
        var partial = resolveAsset(this.vm.$options, 'partials', id, true);
        if (partial) {
          this.factory = new FragmentFactory(this.vm, partial);
          vIf.insert.call(this);
        }
      },
  
      unbind: function unbind() {
        if (this.frag) {
          this.frag.destroy();
        }
      }
    };
  
    var elementDirectives = {
      slot: slot,
      partial: partial
    };
  
    var convertArray = vFor._postProcess;
  
    /**
     * Limit filter for arrays
     *
     * @param {Number} n
     * @param {Number} offset (Decimal expected)
     */
  
    function limitBy(arr, n, offset) {
      offset = offset ? parseInt(offset, 10) : 0;
      n = toNumber(n);
      return typeof n === 'number' ? arr.slice(offset, offset + n) : arr;
    }
  
    /**
     * Filter filter for arrays
     *
     * @param {String} search
     * @param {String} [delimiter]
     * @param {String} ...dataKeys
     */
  
    function filterBy(arr, search, delimiter) {
      arr = convertArray(arr);
      if (search == null) {
        return arr;
      }
      if (typeof search === 'function') {
        return arr.filter(search);
      }
      // cast to lowercase string
      search = ('' + search).toLowerCase();
      // allow optional `in` delimiter
      // because why not
      var n = delimiter === 'in' ? 3 : 2;
      // extract and flatten keys
      var keys = Array.prototype.concat.apply([], toArray(arguments, n));
      var res = [];
      var item, key, val, j;
      for (var i = 0, l = arr.length; i < l; i++) {
        item = arr[i];
        val = item && item.$value || item;
        j = keys.length;
        if (j) {
          while (j--) {
            key = keys[j];
            if (key === '$key' && contains(item.$key, search) || contains(getPath(val, key), search)) {
              res.push(item);
              break;
            }
          }
        } else if (contains(item, search)) {
          res.push(item);
        }
      }
      return res;
    }
  
    /**
     * Filter filter for arrays
     *
     * @param {String|Array<String>|Function} ...sortKeys
     * @param {Number} [order]
     */
  
    function orderBy(arr) {
      var comparator = null;
      var sortKeys = undefined;
      arr = convertArray(arr);
  
      // determine order (last argument)
      var args = toArray(arguments, 1);
      var order = args[args.length - 1];
      if (typeof order === 'number') {
        order = order < 0 ? -1 : 1;
        args = args.length > 1 ? args.slice(0, -1) : args;
      } else {
        order = 1;
      }
  
      // determine sortKeys & comparator
      var firstArg = args[0];
      if (!firstArg) {
        return arr;
      } else if (typeof firstArg === 'function') {
        // custom comparator
        comparator = function (a, b) {
          return firstArg(a, b) * order;
        };
      } else {
        // string keys. flatten first
        sortKeys = Array.prototype.concat.apply([], args);
        comparator = function (a, b, i) {
          i = i || 0;
          return i >= sortKeys.length - 1 ? baseCompare(a, b, i) : baseCompare(a, b, i) || comparator(a, b, i + 1);
        };
      }
  
      function baseCompare(a, b, sortKeyIndex) {
        var sortKey = sortKeys[sortKeyIndex];
        if (sortKey) {
          if (sortKey !== '$key') {
            if (isObject(a) && '$value' in a) a = a.$value;
            if (isObject(b) && '$value' in b) b = b.$value;
          }
          a = isObject(a) ? getPath(a, sortKey) : a;
          b = isObject(b) ? getPath(b, sortKey) : b;
        }
        return a === b ? 0 : a > b ? order : -order;
      }
  
      // sort on a copy to avoid mutating original array
      return arr.slice().sort(comparator);
    }
  
    /**
     * String contain helper
     *
     * @param {*} val
     * @param {String} search
     */
  
    function contains(val, search) {
      var i;
      if (isPlainObject(val)) {
        var keys = Object.keys(val);
        i = keys.length;
        while (i--) {
          if (contains(val[keys[i]], search)) {
            return true;
          }
        }
      } else if (isArray(val)) {
        i = val.length;
        while (i--) {
          if (contains(val[i], search)) {
            return true;
          }
        }
      } else if (val != null) {
        return val.toString().toLowerCase().indexOf(search) > -1;
      }
    }
  
    var digitsRE = /(\d{3})(?=\d)/g;
  
    // asset collections must be a plain object.
    var filters = {
  
      orderBy: orderBy,
      filterBy: filterBy,
      limitBy: limitBy,
  
      /**
       * Stringify value.
       *
       * @param {Number} indent
       */
  
      json: {
        read: function read(value, indent) {
          return typeof value === 'string' ? value : JSON.stringify(value, null, arguments.length > 1 ? indent : 2);
        },
        write: function write(value) {
          try {
            return JSON.parse(value);
          } catch (e) {
            return value;
          }
        }
      },
  
      /**
       * 'abc' => 'Abc'
       */
  
      capitalize: function capitalize(value) {
        if (!value && value !== 0) return '';
        value = value.toString();
        return value.charAt(0).toUpperCase() + value.slice(1);
      },
  
      /**
       * 'abc' => 'ABC'
       */
  
      uppercase: function uppercase(value) {
        return value || value === 0 ? value.toString().toUpperCase() : '';
      },
  
      /**
       * 'AbC' => 'abc'
       */
  
      lowercase: function lowercase(value) {
        return value || value === 0 ? value.toString().toLowerCase() : '';
      },
  
      /**
       * 12345 => $12,345.00
       *
       * @param {String} sign
       * @param {Number} decimals Decimal places
       */
  
      currency: function currency(value, _currency, decimals) {
        value = parseFloat(value);
        if (!isFinite(value) || !value && value !== 0) return '';
        _currency = _currency != null ? _currency : '$';
        decimals = decimals != null ? decimals : 2;
        var stringified = Math.abs(value).toFixed(decimals);
        var _int = decimals ? stringified.slice(0, -1 - decimals) : stringified;
        var i = _int.length % 3;
        var head = i > 0 ? _int.slice(0, i) + (_int.length > 3 ? ',' : '') : '';
        var _float = decimals ? stringified.slice(-1 - decimals) : '';
        var sign = value < 0 ? '-' : '';
        return sign + _currency + head + _int.slice(i).replace(digitsRE, '$1,') + _float;
      },
  
      /**
       * 'item' => 'items'
       *
       * @params
       *  an array of strings corresponding to
       *  the single, double, triple ... forms of the word to
       *  be pluralized. When the number to be pluralized
       *  exceeds the length of the args, it will use the last
       *  entry in the array.
       *
       *  e.g. ['single', 'double', 'triple', 'multiple']
       */
  
      pluralize: function pluralize(value) {
        var args = toArray(arguments, 1);
        var length = args.length;
        if (length > 1) {
          var index = value % 10 - 1;
          return index in args ? args[index] : args[length - 1];
        } else {
          return args[0] + (value === 1 ? '' : 's');
        }
      },
  
      /**
       * Debounce a handler function.
       *
       * @param {Function} handler
       * @param {Number} delay = 300
       * @return {Function}
       */
  
      debounce: function debounce(handler, delay) {
        if (!handler) return;
        if (!delay) {
          delay = 300;
        }
        return _debounce(handler, delay);
      }
    };
  
    function installGlobalAPI (Vue) {
      /**
       * Vue and every constructor that extends Vue has an
       * associated options object, which can be accessed during
       * compilation steps as `this.constructor.options`.
       *
       * These can be seen as the default options of every
       * Vue instance.
       */
  
      Vue.options = {
        directives: directives,
        elementDirectives: elementDirectives,
        filters: filters,
        transitions: {},
        components: {},
        partials: {},
        replace: true
      };
  
      /**
       * Expose useful internals
       */
  
      Vue.util = util;
      Vue.config = config;
      Vue.set = set;
      Vue['delete'] = del;
      Vue.nextTick = nextTick;
  
      /**
       * The following are exposed for advanced usage / plugins
       */
  
      Vue.compiler = compiler;
      Vue.FragmentFactory = FragmentFactory;
      Vue.internalDirectives = internalDirectives;
      Vue.parsers = {
        path: path,
        text: text,
        template: template,
        directive: directive,
        expression: expression
      };
  
      /**
       * Each instance constructor, including Vue, has a unique
       * cid. This enables us to create wrapped "child
       * constructors" for prototypal inheritance and cache them.
       */
  
      Vue.cid = 0;
      var cid = 1;
  
      /**
       * Class inheritance
       *
       * @param {Object} extendOptions
       */
  
      Vue.extend = function (extendOptions) {
        extendOptions = extendOptions || {};
        var Super = this;
        var isFirstExtend = Super.cid === 0;
        if (isFirstExtend && extendOptions._Ctor) {
          return extendOptions._Ctor;
        }
        var name = extendOptions.name || Super.options.name;
        if ('development' !== 'production') {
          if (!/^[a-zA-Z][\w-]*$/.test(name)) {
            warn('Invalid component name: "' + name + '". Component names ' + 'can only contain alphanumeric characaters and the hyphen.');
            name = null;
          }
        }
        var Sub = function VueComponent(options) {
          Vue.call(this, options);
        };
        Sub.prototype = Object.create(Super.prototype);
        Sub.prototype.constructor = Sub;
        Sub.cid = cid++;
        Sub.options = mergeOptions(Super.options, extendOptions);
        Sub['super'] = Super;
        // allow further extension
        Sub.extend = Super.extend;
        // create asset registers, so extended classes
        // can have their private assets too.
        config._assetTypes.forEach(function (type) {
          Sub[type] = Super[type];
        });
        // enable recursive self-lookup
        if (name) {
          Sub.options.components[name] = Sub;
        }
        // cache constructor
        if (isFirstExtend) {
          extendOptions._Ctor = Sub;
        }
        return Sub;
      };
  
      /**
       * Plugin system
       *
       * @param {Object} plugin
       */
  
      Vue.use = function (plugin) {
        /* istanbul ignore if */
        if (plugin.installed) {
          return;
        }
        // additional parameters
        var args = toArray(arguments, 1);
        args.unshift(this);
        if (typeof plugin.install === 'function') {
          plugin.install.apply(plugin, args);
        } else {
          plugin.apply(null, args);
        }
        plugin.installed = true;
        return this;
      };
  
      /**
       * Apply a global mixin by merging it into the default
       * options.
       */
  
      Vue.mixin = function (mixin) {
        Vue.options = mergeOptions(Vue.options, mixin);
      };
  
      /**
       * Create asset registration methods with the following
       * signature:
       *
       * @param {String} id
       * @param {*} definition
       */
  
      config._assetTypes.forEach(function (type) {
        Vue[type] = function (id, definition) {
          if (!definition) {
            return this.options[type + 's'][id];
          } else {
            /* istanbul ignore if */
            if ('development' !== 'production') {
              if (type === 'component' && (commonTagRE.test(id) || reservedTagRE.test(id))) {
                warn('Do not use built-in or reserved HTML elements as component ' + 'id: ' + id);
              }
            }
            if (type === 'component' && isPlainObject(definition)) {
              if (!definition.name) {
                definition.name = id;
              }
              definition = Vue.extend(definition);
            }
            this.options[type + 's'][id] = definition;
            return definition;
          }
        };
      });
  
      // expose internal transition API
      extend(Vue.transition, transition);
    }
  
    installGlobalAPI(Vue);
  
    Vue.version = '1.0.26-csp';
  
    // devtools global hook
    /* istanbul ignore next */
    setTimeout(function () {
      if (config.devtools) {
        if (devtools) {
          devtools.emit('init', Vue);
        } else if ('development' !== 'production' && inBrowser && /Chrome\/\d+/.test(window.navigator.userAgent)) {
          console.log('Download the Vue Devtools for a better development experience:\n' + 'https://github.com/vuejs/vue-devtools');
        }
      }
    }, 0);
  
    return Vue;
  
  }));