(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('./empty')) :
	typeof define === 'function' && define.amd ? define(['exports', './empty'], factory) :
	(factory((global.jsondiffpatch = {}),global.chalk));
}(this, (function (exports,chalk) { 'use strict';

chalk = chalk && chalk.hasOwnProperty('default') ? chalk['default'] : chalk;

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
  return typeof obj;
} : function (obj) {
  return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};











var classCallCheck = function (instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
};

var createClass = function () {
  function defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  return function (Constructor, protoProps, staticProps) {
    if (protoProps) defineProperties(Constructor.prototype, protoProps);
    if (staticProps) defineProperties(Constructor, staticProps);
    return Constructor;
  };
}();







var get = function get(object, property, receiver) {
  if (object === null) object = Function.prototype;
  var desc = Object.getOwnPropertyDescriptor(object, property);

  if (desc === undefined) {
    var parent = Object.getPrototypeOf(object);

    if (parent === null) {
      return undefined;
    } else {
      return get(parent, property, receiver);
    }
  } else if ("value" in desc) {
    return desc.value;
  } else {
    var getter = desc.get;

    if (getter === undefined) {
      return undefined;
    }

    return getter.call(receiver);
  }
};

var inherits = function (subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function, not " + typeof superClass);
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      enumerable: false,
      writable: true,
      configurable: true
    }
  });
  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;
};











var possibleConstructorReturn = function (self, call) {
  if (!self) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return call && (typeof call === "object" || typeof call === "function") ? call : self;
};





var slicedToArray = function () {
  function sliceIterator(arr, i) {
    var _arr = [];
    var _n = true;
    var _d = false;
    var _e = undefined;

    try {
      for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
        _arr.push(_s.value);

        if (i && _arr.length === i) break;
      }
    } catch (err) {
      _d = true;
      _e = err;
    } finally {
      try {
        if (!_n && _i["return"]) _i["return"]();
      } finally {
        if (_d) throw _e;
      }
    }

    return _arr;
  }

  return function (arr, i) {
    if (Array.isArray(arr)) {
      return arr;
    } else if (Symbol.iterator in Object(arr)) {
      return sliceIterator(arr, i);
    } else {
      throw new TypeError("Invalid attempt to destructure non-iterable instance");
    }
  };
}();













var toConsumableArray = function (arr) {
  if (Array.isArray(arr)) {
    for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i];

    return arr2;
  } else {
    return Array.from(arr);
  }
};

var Processor = function () {
  function Processor(options) {
    classCallCheck(this, Processor);

    this.selfOptions = options || {};
    this.pipes = {};
  }

  createClass(Processor, [{
    key: 'options',
    value: function options(_options) {
      if (_options) {
        this.selfOptions = _options;
      }
      return this.selfOptions;
    }
  }, {
    key: 'pipe',
    value: function pipe(name, pipeArg) {
      var pipe = pipeArg;
      if (typeof name === 'string') {
        if (typeof pipe === 'undefined') {
          return this.pipes[name];
        } else {
          this.pipes[name] = pipe;
        }
      }
      if (name && name.name) {
        pipe = name;
        if (pipe.processor === this) {
          return pipe;
        }
        this.pipes[pipe.name] = pipe;
      }
      pipe.processor = this;
      return pipe;
    }
  }, {
    key: 'process',
    value: function process(input, pipe) {
      var context = input;
      context.options = this.options();
      var nextPipe = pipe || input.pipe || 'default';
      var lastPipe = void 0;
      var lastContext = void 0;
      while (nextPipe) {
        if (typeof context.nextAfterChildren !== 'undefined') {
          // children processed and coming back to parent
          context.next = context.nextAfterChildren;
          context.nextAfterChildren = null;
        }

        if (typeof nextPipe === 'string') {
          nextPipe = this.pipe(nextPipe);
        }
        nextPipe.process(context);
        lastContext = context;
        lastPipe = nextPipe;
        nextPipe = null;
        if (context) {
          if (context.next) {
            context = context.next;
            nextPipe = lastContext.nextPipe || context.pipe || lastPipe;
          }
        }
      }
      return context.hasResult ? context.result : undefined;
    }
  }]);
  return Processor;
}();

var Pipe = function () {
  function Pipe(name) {
    classCallCheck(this, Pipe);

    this.name = name;
    this.filters = [];
  }

  createClass(Pipe, [{
    key: 'process',
    value: function process(input) {
      if (!this.processor) {
        throw new Error('add this pipe to a processor before using it');
      }
      var debug = this.debug;
      var length = this.filters.length;
      var context = input;
      for (var index = 0; index < length; index++) {
        var filter = this.filters[index];
        if (debug) {
          this.log('filter: ' + filter.filterName);
        }
        filter(context);
        if ((typeof context === 'undefined' ? 'undefined' : _typeof(context)) === 'object' && context.exiting) {
          context.exiting = false;
          break;
        }
      }
      if (!context.next && this.resultCheck) {
        this.resultCheck(context);
      }
    }
  }, {
    key: 'log',
    value: function log(msg) {
      console.log('[jsondiffpatch] ' + this.name + ' pipe, ' + msg);
    }
  }, {
    key: 'append',
    value: function append() {
      var _filters;

      (_filters = this.filters).push.apply(_filters, arguments);
      return this;
    }
  }, {
    key: 'prepend',
    value: function prepend() {
      var _filters2;

      (_filters2 = this.filters).unshift.apply(_filters2, arguments);
      return this;
    }
  }, {
    key: 'indexOf',
    value: function indexOf(filterName) {
      if (!filterName) {
        throw new Error('a filter name is required');
      }
      for (var index = 0; index < this.filters.length; index++) {
        var filter = this.filters[index];
        if (filter.filterName === filterName) {
          return index;
        }
      }
      throw new Error('filter not found: ' + filterName);
    }
  }, {
    key: 'list',
    value: function list() {
      return this.filters.map(function (f) {
        return f.filterName;
      });
    }
  }, {
    key: 'after',
    value: function after(filterName) {
      var index = this.indexOf(filterName);
      var params = Array.prototype.slice.call(arguments, 1);
      if (!params.length) {
        throw new Error('a filter is required');
      }
      params.unshift(index + 1, 0);
      Array.prototype.splice.apply(this.filters, params);
      return this;
    }
  }, {
    key: 'before',
    value: function before(filterName) {
      var index = this.indexOf(filterName);
      var params = Array.prototype.slice.call(arguments, 1);
      if (!params.length) {
        throw new Error('a filter is required');
      }
      params.unshift(index, 0);
      Array.prototype.splice.apply(this.filters, params);
      return this;
    }
  }, {
    key: 'replace',
    value: function replace(filterName) {
      var index = this.indexOf(filterName);
      var params = Array.prototype.slice.call(arguments, 1);
      if (!params.length) {
        throw new Error('a filter is required');
      }
      params.unshift(index, 1);
      Array.prototype.splice.apply(this.filters, params);
      return this;
    }
  }, {
    key: 'remove',
    value: function remove(filterName) {
      var index = this.indexOf(filterName);
      this.filters.splice(index, 1);
      return this;
    }
  }, {
    key: 'clear',
    value: function clear() {
      this.filters.length = 0;
      return this;
    }
  }, {
    key: 'shouldHaveResult',
    value: function shouldHaveResult(should) {
      if (should === false) {
        this.resultCheck = null;
        return;
      }
      if (this.resultCheck) {
        return;
      }
      var pipe = this;
      this.resultCheck = function (context) {
        if (!context.hasResult) {
          console.log(context);
          var error = new Error(pipe.name + ' failed');
          error.noResult = true;
          throw error;
        }
      };
      return this;
    }
  }]);
  return Pipe;
}();

var Context = function () {
  function Context() {
    classCallCheck(this, Context);
  }

  createClass(Context, [{
    key: 'setResult',
    value: function setResult(result) {
      this.result = result;
      this.hasResult = true;
      return this;
    }
  }, {
    key: 'exit',
    value: function exit() {
      this.exiting = true;
      return this;
    }
  }, {
    key: 'switchTo',
    value: function switchTo(next, pipe) {
      if (typeof next === 'string' || next instanceof Pipe) {
        this.nextPipe = next;
      } else {
        this.next = next;
        if (pipe) {
          this.nextPipe = pipe;
        }
      }
      return this;
    }
  }, {
    key: 'push',
    value: function push(child, name) {
      child.parent = this;
      if (typeof name !== 'undefined') {
        child.childName = name;
      }
      child.root = this.root || this;
      child.options = child.options || this.options;
      if (!this.children) {
        this.children = [child];
        this.nextAfterChildren = this.next || null;
        this.next = child;
      } else {
        this.children[this.children.length - 1].next = child;
        this.children.push(child);
      }
      child.next = this;
      return this;
    }
  }]);
  return Context;
}();

var isArray = typeof Array.isArray === 'function' ? Array.isArray : function (a) {
  return a instanceof Array;
};

function cloneRegExp(re) {
  var regexMatch = /^\/(.*)\/([gimyu]*)$/.exec(re.toString());
  return new RegExp(regexMatch[1], regexMatch[2]);
}

function clone(arg) {
  if ((typeof arg === 'undefined' ? 'undefined' : _typeof(arg)) !== 'object') {
    return arg;
  }
  if (arg === null) {
    return null;
  }
  if (isArray(arg)) {
    return arg.map(clone);
  }
  if (arg instanceof Date) {
    return new Date(arg.getTime());
  }
  if (arg instanceof RegExp) {
    return cloneRegExp(arg);
  }
  var cloned = {};
  for (var name in arg) {
    if (Object.prototype.hasOwnProperty.call(arg, name)) {
      cloned[name] = clone(arg[name]);
    }
  }
  return cloned;
}

var DiffContext = function (_Context) {
  inherits(DiffContext, _Context);

  function DiffContext(left, right) {
    classCallCheck(this, DiffContext);

    var _this = possibleConstructorReturn(this, (DiffContext.__proto__ || Object.getPrototypeOf(DiffContext)).call(this));

    _this.left = left;
    _this.right = right;
    _this.pipe = 'diff';
    return _this;
  }

  createClass(DiffContext, [{
    key: 'setResult',
    value: function setResult(result) {
      if (this.options.cloneDiffValues && (typeof result === 'undefined' ? 'undefined' : _typeof(result)) === 'object') {
        var clone$$1 = typeof this.options.cloneDiffValues === 'function' ? this.options.cloneDiffValues : clone;
        if (_typeof(result[0]) === 'object') {
          result[0] = clone$$1(result[0]);
        }
        if (_typeof(result[1]) === 'object') {
          result[1] = clone$$1(result[1]);
        }
      }
      return Context.prototype.setResult.apply(this, arguments);
    }
  }]);
  return DiffContext;
}(Context);

var PatchContext = function (_Context) {
  inherits(PatchContext, _Context);

  function PatchContext(left, delta) {
    classCallCheck(this, PatchContext);

    var _this = possibleConstructorReturn(this, (PatchContext.__proto__ || Object.getPrototypeOf(PatchContext)).call(this));

    _this.left = left;
    _this.delta = delta;
    _this.pipe = 'patch';
    return _this;
  }

  return PatchContext;
}(Context);

var ReverseContext = function (_Context) {
  inherits(ReverseContext, _Context);

  function ReverseContext(delta) {
    classCallCheck(this, ReverseContext);

    var _this = possibleConstructorReturn(this, (ReverseContext.__proto__ || Object.getPrototypeOf(ReverseContext)).call(this));

    _this.delta = delta;
    _this.pipe = 'reverse';
    return _this;
  }

  return ReverseContext;
}(Context);

var isArray$1 = typeof Array.isArray === 'function' ? Array.isArray : function (a) {
  return a instanceof Array;
};

var diffFilter = function trivialMatchesDiffFilter(context) {
  if (context.left === context.right) {
    context.setResult(undefined).exit();
    return;
  }
  if (typeof context.left === 'undefined') {
    if (typeof context.right === 'function') {
      throw new Error('functions are not supported');
    }
    context.setResult([context.right]).exit();
    return;
  }
  if (typeof context.right === 'undefined') {
    context.setResult([context.left, 0, 0]).exit();
    return;
  }
  if (typeof context.left === 'function' || typeof context.right === 'function') {
    throw new Error('functions are not supported');
  }
  context.leftType = context.left === null ? 'null' : _typeof(context.left);
  context.rightType = context.right === null ? 'null' : _typeof(context.right);
  if (context.leftType !== context.rightType) {
    context.setResult([context.left, context.right]).exit();
    return;
  }
  if (context.leftType === 'boolean' || context.leftType === 'number') {
    context.setResult([context.left, context.right]).exit();
    return;
  }
  if (context.leftType === 'object') {
    context.leftIsArray = isArray$1(context.left);
  }
  if (context.rightType === 'object') {
    context.rightIsArray = isArray$1(context.right);
  }
  if (context.leftIsArray !== context.rightIsArray) {
    context.setResult([context.left, context.right]).exit();
    return;
  }

  if (context.left instanceof RegExp) {
    if (context.right instanceof RegExp) {
      context.setResult([context.left.toString(), context.right.toString()]).exit();
    } else {
      context.setResult([context.left, context.right]).exit();
    }
  }
};
diffFilter.filterName = 'trivial';

var patchFilter = function trivialMatchesPatchFilter(context) {
  if (typeof context.delta === 'undefined') {
    context.setResult(context.left).exit();
    return;
  }
  context.nested = !isArray$1(context.delta);
  if (context.nested) {
    return;
  }
  if (context.delta.length === 1) {
    context.setResult(context.delta[0]).exit();
    return;
  }
  if (context.delta.length === 2) {
    if (context.left instanceof RegExp) {
      var regexArgs = /^\/(.*)\/([gimyu]+)$/.exec(context.delta[1]);
      if (regexArgs) {
        context.setResult(new RegExp(regexArgs[1], regexArgs[2])).exit();
        return;
      }
    }
    context.setResult(context.delta[1]).exit();
    return;
  }
  if (context.delta.length === 3 && context.delta[2] === 0) {
    context.setResult(undefined).exit();
  }
};
patchFilter.filterName = 'trivial';

var reverseFilter = function trivialReferseFilter(context) {
  if (typeof context.delta === 'undefined') {
    context.setResult(context.delta).exit();
    return;
  }
  context.nested = !isArray$1(context.delta);
  if (context.nested) {
    return;
  }
  if (context.delta.length === 1) {
    context.setResult([context.delta[0], 0, 0]).exit();
    return;
  }
  if (context.delta.length === 2) {
    context.setResult([context.delta[1], context.delta[0]]).exit();
    return;
  }
  if (context.delta.length === 3 && context.delta[2] === 0) {
    context.setResult([context.delta[0]]).exit();
  }
};
reverseFilter.filterName = 'trivial';

function collectChildrenDiffFilter(context) {
  if (!context || !context.children) {
    return;
  }
  var length = context.children.length;
  var child = void 0;
  var result = context.result;
  for (var index = 0; index < length; index++) {
    child = context.children[index];
    if (typeof child.result === 'undefined') {
      continue;
    }
    result = result || {};
    result[child.childName] = child.result;
  }
  if (result && context.leftIsArray) {
    result._t = 'a';
  }
  context.setResult(result).exit();
}
collectChildrenDiffFilter.filterName = 'collectChildren';

function objectsDiffFilter(context) {
  if (context.leftIsArray || context.leftType !== 'object') {
    return;
  }

  var name = void 0;
  var child = void 0;
  var propertyFilter = context.options.propertyFilter;
  for (name in context.left) {
    if (!Object.prototype.hasOwnProperty.call(context.left, name)) {
      continue;
    }
    if (propertyFilter && !propertyFilter(name, context)) {
      continue;
    }
    child = new DiffContext(context.left[name], context.right[name]);
    context.push(child, name);
  }
  for (name in context.right) {
    if (!Object.prototype.hasOwnProperty.call(context.right, name)) {
      continue;
    }
    if (propertyFilter && !propertyFilter(name, context)) {
      continue;
    }
    if (typeof context.left[name] === 'undefined') {
      child = new DiffContext(undefined, context.right[name]);
      context.push(child, name);
    }
  }

  if (!context.children || context.children.length === 0) {
    context.setResult(undefined).exit();
    return;
  }
  context.exit();
}
objectsDiffFilter.filterName = 'objects';

var patchFilter$1 = function nestedPatchFilter(context) {
  if (!context.nested) {
    return;
  }
  if (context.delta._t) {
    return;
  }
  var name = void 0;
  var child = void 0;
  for (name in context.delta) {
    child = new PatchContext(context.left[name], context.delta[name]);
    context.push(child, name);
  }
  context.exit();
};
patchFilter$1.filterName = 'objects';

var collectChildrenPatchFilter = function collectChildrenPatchFilter(context) {
  if (!context || !context.children) {
    return;
  }
  if (context.delta._t) {
    return;
  }
  var length = context.children.length;
  var child = void 0;
  for (var index = 0; index < length; index++) {
    child = context.children[index];
    if (Object.prototype.hasOwnProperty.call(context.left, child.childName) && child.result === undefined) {
      delete context.left[child.childName];
    } else if (context.left[child.childName] !== child.result) {
      context.left[child.childName] = child.result;
    }
  }
  context.setResult(context.left).exit();
};
collectChildrenPatchFilter.filterName = 'collectChildren';

var reverseFilter$1 = function nestedReverseFilter(context) {
  if (!context.nested) {
    return;
  }
  if (context.delta._t) {
    return;
  }
  var name = void 0;
  var child = void 0;
  for (name in context.delta) {
    child = new ReverseContext(context.delta[name]);
    context.push(child, name);
  }
  context.exit();
};
reverseFilter$1.filterName = 'objects';

function collectChildrenReverseFilter(context) {
  if (!context || !context.children) {
    return;
  }
  if (context.delta._t) {
    return;
  }
  var length = context.children.length;
  var child = void 0;
  var delta = {};
  for (var index = 0; index < length; index++) {
    child = context.children[index];
    if (delta[child.childName] !== child.result) {
      delta[child.childName] = child.result;
    }
  }
  context.setResult(delta).exit();
}
collectChildrenReverseFilter.filterName = 'collectChildren';

/*

LCS implementation that supports arrays or strings

reference: http://en.wikipedia.org/wiki/Longest_common_subsequence_problem

*/

var defaultMatch = function defaultMatch(array1, array2, index1, index2) {
  return array1[index1] === array2[index2];
};

var lengthMatrix = function lengthMatrix(array1, array2, match, context) {
  var len1 = array1.length;
  var len2 = array2.length;
  var x = void 0,
      y = void 0;

  // initialize empty matrix of len1+1 x len2+1
  var matrix = [len1 + 1];
  for (x = 0; x < len1 + 1; x++) {
    matrix[x] = [len2 + 1];
    for (y = 0; y < len2 + 1; y++) {
      matrix[x][y] = 0;
    }
  }
  matrix.match = match;
  // save sequence lengths for each coordinate
  for (x = 1; x < len1 + 1; x++) {
    for (y = 1; y < len2 + 1; y++) {
      if (match(array1, array2, x - 1, y - 1, context)) {
        matrix[x][y] = matrix[x - 1][y - 1] + 1;
      } else {
        matrix[x][y] = Math.max(matrix[x - 1][y], matrix[x][y - 1]);
      }
    }
  }
  return matrix;
};

var backtrack = function backtrack(matrix, array1, array2, index1, index2, context) {
  if (index1 === 0 || index2 === 0) {
    return {
      sequence: [],
      indices1: [],
      indices2: []
    };
  }

  if (matrix.match(array1, array2, index1 - 1, index2 - 1, context)) {
    var subsequence = backtrack(matrix, array1, array2, index1 - 1, index2 - 1, context);
    subsequence.sequence.push(array1[index1 - 1]);
    subsequence.indices1.push(index1 - 1);
    subsequence.indices2.push(index2 - 1);
    return subsequence;
  }

  if (matrix[index1][index2 - 1] > matrix[index1 - 1][index2]) {
    return backtrack(matrix, array1, array2, index1, index2 - 1, context);
  } else {
    return backtrack(matrix, array1, array2, index1 - 1, index2, context);
  }
};

var get$1 = function get(array1, array2, match, context) {
  var innerContext = context || {};
  var matrix = lengthMatrix(array1, array2, match || defaultMatch, innerContext);
  var result = backtrack(matrix, array1, array2, array1.length, array2.length, innerContext);
  if (typeof array1 === 'string' && typeof array2 === 'string') {
    result.sequence = result.sequence.join('');
  }
  return result;
};

var lcs = {
  get: get$1
};

var ARRAY_MOVE = 3;

var isArray$2 = typeof Array.isArray === 'function' ? Array.isArray : function (a) {
  return a instanceof Array;
};

var arrayIndexOf = typeof Array.prototype.indexOf === 'function' ? function (array, item) {
  return array.indexOf(item);
} : function (array, item) {
  var length = array.length;
  for (var i = 0; i < length; i++) {
    if (array[i] === item) {
      return i;
    }
  }
  return -1;
};

function arraysHaveMatchByRef(array1, array2, len1, len2) {
  for (var index1 = 0; index1 < len1; index1++) {
    var val1 = array1[index1];
    for (var index2 = 0; index2 < len2; index2++) {
      var val2 = array2[index2];
      if (index1 !== index2 && val1 === val2) {
        return true;
      }
    }
  }
}

function matchItems(array1, array2, index1, index2, context) {
  var value1 = array1[index1];
  var value2 = array2[index2];
  if (value1 === value2) {
    return true;
  }
  if ((typeof value1 === 'undefined' ? 'undefined' : _typeof(value1)) !== 'object' || (typeof value2 === 'undefined' ? 'undefined' : _typeof(value2)) !== 'object') {
    return false;
  }
  var objectHash = context.objectHash;
  if (!objectHash) {
    // no way to match objects was provided, try match by position
    return context.matchByPosition && index1 === index2;
  }
  var hash1 = void 0;
  var hash2 = void 0;
  if (typeof index1 === 'number') {
    context.hashCache1 = context.hashCache1 || [];
    hash1 = context.hashCache1[index1];
    if (typeof hash1 === 'undefined') {
      context.hashCache1[index1] = hash1 = objectHash(value1, index1);
    }
  } else {
    hash1 = objectHash(value1);
  }
  if (typeof hash1 === 'undefined') {
    return false;
  }
  if (typeof index2 === 'number') {
    context.hashCache2 = context.hashCache2 || [];
    hash2 = context.hashCache2[index2];
    if (typeof hash2 === 'undefined') {
      context.hashCache2[index2] = hash2 = objectHash(value2, index2);
    }
  } else {
    hash2 = objectHash(value2);
  }
  if (typeof hash2 === 'undefined') {
    return false;
  }
  return hash1 === hash2;
}

var diffFilter$1 = function arraysDiffFilter(context) {
  if (!context.leftIsArray) {
    return;
  }

  var matchContext = {
    objectHash: context.options && context.options.objectHash,
    matchByPosition: context.options && context.options.matchByPosition
  };
  var commonHead = 0;
  var commonTail = 0;
  var index = void 0;
  var index1 = void 0;
  var index2 = void 0;
  var array1 = context.left;
  var array2 = context.right;
  var len1 = array1.length;
  var len2 = array2.length;

  var child = void 0;

  if (len1 > 0 && len2 > 0 && !matchContext.objectHash && typeof matchContext.matchByPosition !== 'boolean') {
    matchContext.matchByPosition = !arraysHaveMatchByRef(array1, array2, len1, len2);
  }

  // separate common head
  while (commonHead < len1 && commonHead < len2 && matchItems(array1, array2, commonHead, commonHead, matchContext)) {
    index = commonHead;
    child = new DiffContext(context.left[index], context.right[index]);
    context.push(child, index);
    commonHead++;
  }
  // separate common tail
  while (commonTail + commonHead < len1 && commonTail + commonHead < len2 && matchItems(array1, array2, len1 - 1 - commonTail, len2 - 1 - commonTail, matchContext)) {
    index1 = len1 - 1 - commonTail;
    index2 = len2 - 1 - commonTail;
    child = new DiffContext(context.left[index1], context.right[index2]);
    context.push(child, index2);
    commonTail++;
  }
  var result = void 0;
  if (commonHead + commonTail === len1) {
    if (len1 === len2) {
      // arrays are identical
      context.setResult(undefined).exit();
      return;
    }
    // trivial case, a block (1 or more consecutive items) was added
    result = result || {
      _t: 'a'
    };
    for (index = commonHead; index < len2 - commonTail; index++) {
      result[index] = [array2[index]];
    }
    context.setResult(result).exit();
    return;
  }
  if (commonHead + commonTail === len2) {
    // trivial case, a block (1 or more consecutive items) was removed
    result = result || {
      _t: 'a'
    };
    for (index = commonHead; index < len1 - commonTail; index++) {
      result['_' + index] = [array1[index], 0, 0];
    }
    context.setResult(result).exit();
    return;
  }
  // reset hash cache
  delete matchContext.hashCache1;
  delete matchContext.hashCache2;

  // diff is not trivial, find the LCS (Longest Common Subsequence)
  var trimmed1 = array1.slice(commonHead, len1 - commonTail);
  var trimmed2 = array2.slice(commonHead, len2 - commonTail);
  var seq = lcs.get(trimmed1, trimmed2, matchItems, matchContext);
  var removedItems = [];
  result = result || {
    _t: 'a'
  };
  for (index = commonHead; index < len1 - commonTail; index++) {
    if (arrayIndexOf(seq.indices1, index - commonHead) < 0) {
      // removed
      result['_' + index] = [array1[index], 0, 0];
      removedItems.push(index);
    }
  }

  var detectMove = true;
  if (context.options && context.options.arrays && context.options.arrays.detectMove === false) {
    detectMove = false;
  }
  var includeValueOnMove = false;
  if (context.options && context.options.arrays && context.options.arrays.includeValueOnMove) {
    includeValueOnMove = true;
  }

  var removedItemsLength = removedItems.length;
  for (index = commonHead; index < len2 - commonTail; index++) {
    var indexOnArray2 = arrayIndexOf(seq.indices2, index - commonHead);
    if (indexOnArray2 < 0) {
      // added, try to match with a removed item and register as position move
      var isMove = false;
      if (detectMove && removedItemsLength > 0) {
        for (var removeItemIndex1 = 0; removeItemIndex1 < removedItemsLength; removeItemIndex1++) {
          index1 = removedItems[removeItemIndex1];
          if (matchItems(trimmed1, trimmed2, index1 - commonHead, index - commonHead, matchContext)) {
            // store position move as: [originalValue, newPosition, ARRAY_MOVE]
            result['_' + index1].splice(1, 2, index, ARRAY_MOVE);
            if (!includeValueOnMove) {
              // don't include moved value on diff, to save bytes
              result['_' + index1][0] = '';
            }

            index2 = index;
            child = new DiffContext(context.left[index1], context.right[index2]);
            context.push(child, index2);
            removedItems.splice(removeItemIndex1, 1);
            isMove = true;
            break;
          }
        }
      }
      if (!isMove) {
        // added
        result[index] = [array2[index]];
      }
    } else {
      // match, do inner diff
      index1 = seq.indices1[indexOnArray2] + commonHead;
      index2 = seq.indices2[indexOnArray2] + commonHead;
      child = new DiffContext(context.left[index1], context.right[index2]);
      context.push(child, index2);
    }
  }

  context.setResult(result).exit();
};
diffFilter$1.filterName = 'arrays';

var compare = {
  numerically: function numerically(a, b) {
    return a - b;
  },
  numericallyBy: function numericallyBy(name) {
    return function (a, b) {
      return a[name] - b[name];
    };
  }
};

var patchFilter$2 = function nestedPatchFilter(context) {
  if (!context.nested) {
    return;
  }
  if (context.delta._t !== 'a') {
    return;
  }
  var index = void 0;
  var index1 = void 0;

  var delta = context.delta;
  var array = context.left;

  // first, separate removals, insertions and modifications
  var toRemove = [];
  var toInsert = [];
  var toModify = [];
  for (index in delta) {
    if (index !== '_t') {
      if (index[0] === '_') {
        // removed item from original array
        if (delta[index][2] === 0 || delta[index][2] === ARRAY_MOVE) {
          toRemove.push(parseInt(index.slice(1), 10));
        } else {
          throw new Error('only removal or move can be applied at original array indices,' + (' invalid diff type: ' + delta[index][2]));
        }
      } else {
        if (delta[index].length === 1) {
          // added item at new array
          toInsert.push({
            index: parseInt(index, 10),
            value: delta[index][0]
          });
        } else {
          // modified item at new array
          toModify.push({
            index: parseInt(index, 10),
            delta: delta[index]
          });
        }
      }
    }
  }

  // remove items, in reverse order to avoid sawing our own floor
  toRemove = toRemove.sort(compare.numerically);
  for (index = toRemove.length - 1; index >= 0; index--) {
    index1 = toRemove[index];
    var indexDiff = delta['_' + index1];
    var removedValue = array.splice(index1, 1)[0];
    if (indexDiff[2] === ARRAY_MOVE) {
      // reinsert later
      toInsert.push({
        index: indexDiff[1],
        value: removedValue
      });
    }
  }

  // insert items, in reverse order to avoid moving our own floor
  toInsert = toInsert.sort(compare.numericallyBy('index'));
  var toInsertLength = toInsert.length;
  for (index = 0; index < toInsertLength; index++) {
    var insertion = toInsert[index];
    array.splice(insertion.index, 0, insertion.value);
  }

  // apply modifications
  var toModifyLength = toModify.length;
  var child = void 0;
  if (toModifyLength > 0) {
    for (index = 0; index < toModifyLength; index++) {
      var modification = toModify[index];
      child = new PatchContext(context.left[modification.index], modification.delta);
      context.push(child, modification.index);
    }
  }

  if (!context.children) {
    context.setResult(context.left).exit();
    return;
  }
  context.exit();
};
patchFilter$2.filterName = 'arrays';

var collectChildrenPatchFilter$1 = function collectChildrenPatchFilter(context) {
  if (!context || !context.children) {
    return;
  }
  if (context.delta._t !== 'a') {
    return;
  }
  var length = context.children.length;
  var child = void 0;
  for (var index = 0; index < length; index++) {
    child = context.children[index];
    context.left[child.childName] = child.result;
  }
  context.setResult(context.left).exit();
};
collectChildrenPatchFilter$1.filterName = 'arraysCollectChildren';

var reverseFilter$2 = function arraysReverseFilter(context) {
  if (!context.nested) {
    if (context.delta[2] === ARRAY_MOVE) {
      context.newName = '_' + context.delta[1];
      context.setResult([context.delta[0], parseInt(context.childName.substr(1), 10), ARRAY_MOVE]).exit();
    }
    return;
  }
  if (context.delta._t !== 'a') {
    return;
  }
  var name = void 0;
  var child = void 0;
  for (name in context.delta) {
    if (name === '_t') {
      continue;
    }
    child = new ReverseContext(context.delta[name]);
    context.push(child, name);
  }
  context.exit();
};
reverseFilter$2.filterName = 'arrays';

var reverseArrayDeltaIndex = function reverseArrayDeltaIndex(delta, index, itemDelta) {
  if (typeof index === 'string' && index[0] === '_') {
    return parseInt(index.substr(1), 10);
  } else if (isArray$2(itemDelta) && itemDelta[2] === 0) {
    return '_' + index;
  }

  var reverseIndex = +index;
  for (var deltaIndex in delta) {
    var deltaItem = delta[deltaIndex];
    if (isArray$2(deltaItem)) {
      if (deltaItem[2] === ARRAY_MOVE) {
        var moveFromIndex = parseInt(deltaIndex.substr(1), 10);
        var moveToIndex = deltaItem[1];
        if (moveToIndex === +index) {
          return moveFromIndex;
        }
        if (moveFromIndex <= reverseIndex && moveToIndex > reverseIndex) {
          reverseIndex++;
        } else if (moveFromIndex >= reverseIndex && moveToIndex < reverseIndex) {
          reverseIndex--;
        }
      } else if (deltaItem[2] === 0) {
        var deleteIndex = parseInt(deltaIndex.substr(1), 10);
        if (deleteIndex <= reverseIndex) {
          reverseIndex++;
        }
      } else if (deltaItem.length === 1 && deltaIndex <= reverseIndex) {
        reverseIndex--;
      }
    }
  }

  return reverseIndex;
};

function collectChildrenReverseFilter$1(context) {
  if (!context || !context.children) {
    return;
  }
  if (context.delta._t !== 'a') {
    return;
  }
  var length = context.children.length;
  var child = void 0;
  var delta = {
    _t: 'a'
  };

  for (var index = 0; index < length; index++) {
    child = context.children[index];
    var name = child.newName;
    if (typeof name === 'undefined') {
      name = reverseArrayDeltaIndex(context.delta, child.childName, child.result);
    }
    if (delta[name] !== child.result) {
      delta[name] = child.result;
    }
  }
  context.setResult(delta).exit();
}
collectChildrenReverseFilter$1.filterName = 'arraysCollectChildren';

var diffFilter$2 = function datesDiffFilter(context) {
  if (context.left instanceof Date) {
    if (context.right instanceof Date) {
      if (context.left.getTime() !== context.right.getTime()) {
        context.setResult([context.left, context.right]);
      } else {
        context.setResult(undefined);
      }
    } else {
      context.setResult([context.left, context.right]);
    }
    context.exit();
  } else if (context.right instanceof Date) {
    context.setResult([context.left, context.right]).exit();
  }
};
diffFilter$2.filterName = 'dates';

function createCommonjsModule(fn, module) {
	return module = { exports: {} }, fn(module, module.exports), module.exports;
}

var diffMatchPatch = createCommonjsModule(function (module) {
function diff_match_patch() {

  // Defaults.
  // Redefine these in your program to override the defaults.

  // Number of seconds to map a diff before giving up (0 for infinity).
  this.Diff_Timeout = 1.0;
  // Cost of an empty edit operation in terms of edit characters.
  this.Diff_EditCost = 4;
  // At what point is no match declared (0.0 = perfection, 1.0 = very loose).
  this.Match_Threshold = 0.5;
  // How far to search for a match (0 = exact location, 1000+ = broad match).
  // A match this many characters away from the expected location will add
  // 1.0 to the score (0.0 is a perfect match).
  this.Match_Distance = 1000;
  // When deleting a large block of text (over ~64 characters), how close do
  // the contents have to be to match the expected contents. (0.0 = perfection,
  // 1.0 = very loose).  Note that Match_Threshold controls how closely the
  // end points of a delete need to match.
  this.Patch_DeleteThreshold = 0.5;
  // Chunk size for context length.
  this.Patch_Margin = 4;

  // The number of bits in an int.
  this.Match_MaxBits = 32;
}


//  DIFF FUNCTIONS


/**
 * The data structure representing a diff is an array of tuples:
 * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]
 * which means: delete 'Hello', add 'Goodbye' and keep ' world.'
 */
var DIFF_DELETE = -1;
var DIFF_INSERT = 1;
var DIFF_EQUAL = 0;

/** @typedef {{0: number, 1: string}} */
diff_match_patch.prototype.diff_main = function(text1, text2, opt_checklines,
    opt_deadline) {
  // Set a deadline by which time the diff must be complete.
  if (typeof opt_deadline == 'undefined') {
    if (this.Diff_Timeout <= 0) {
      opt_deadline = Number.MAX_VALUE;
    } else {
      opt_deadline = (new Date).getTime() + this.Diff_Timeout * 1000;
    }
  }
  var deadline = opt_deadline;

  // Check for null inputs.
  if (text1 == null || text2 == null) {
    throw new Error('Null input. (diff_main)');
  }

  // Check for equality (speedup).
  if (text1 == text2) {
    if (text1) {
      return [[DIFF_EQUAL, text1]];
    }
    return [];
  }

  if (typeof opt_checklines == 'undefined') {
    opt_checklines = true;
  }
  var checklines = opt_checklines;

  // Trim off common prefix (speedup).
  var commonlength = this.diff_commonPrefix(text1, text2);
  var commonprefix = text1.substring(0, commonlength);
  text1 = text1.substring(commonlength);
  text2 = text2.substring(commonlength);

  // Trim off common suffix (speedup).
  commonlength = this.diff_commonSuffix(text1, text2);
  var commonsuffix = text1.substring(text1.length - commonlength);
  text1 = text1.substring(0, text1.length - commonlength);
  text2 = text2.substring(0, text2.length - commonlength);

  // Compute the diff on the middle block.
  var diffs = this.diff_compute_(text1, text2, checklines, deadline);

  // Restore the prefix and suffix.
  if (commonprefix) {
    diffs.unshift([DIFF_EQUAL, commonprefix]);
  }
  if (commonsuffix) {
    diffs.push([DIFF_EQUAL, commonsuffix]);
  }
  this.diff_cleanupMerge(diffs);
  return diffs;
};


/**
 * Find the differences between two texts.  Assumes that the texts do not
 * have any common prefix or suffix.
 * @param {string} text1 Old string to be diffed.
 * @param {string} text2 New string to be diffed.
 * @param {boolean} checklines Speedup flag.  If false, then don't run a
 *     line-level diff first to identify the changed areas.
 *     If true, then run a faster, slightly less optimal diff.
 * @param {number} deadline Time when the diff should be complete by.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 * @private
 */
diff_match_patch.prototype.diff_compute_ = function(text1, text2, checklines,
    deadline) {
  var diffs;

  if (!text1) {
    // Just add some text (speedup).
    return [[DIFF_INSERT, text2]];
  }

  if (!text2) {
    // Just delete some text (speedup).
    return [[DIFF_DELETE, text1]];
  }

  var longtext = text1.length > text2.length ? text1 : text2;
  var shorttext = text1.length > text2.length ? text2 : text1;
  var i = longtext.indexOf(shorttext);
  if (i != -1) {
    // Shorter text is inside the longer text (speedup).
    diffs = [[DIFF_INSERT, longtext.substring(0, i)],
             [DIFF_EQUAL, shorttext],
             [DIFF_INSERT, longtext.substring(i + shorttext.length)]];
    // Swap insertions for deletions if diff is reversed.
    if (text1.length > text2.length) {
      diffs[0][0] = diffs[2][0] = DIFF_DELETE;
    }
    return diffs;
  }

  if (shorttext.length == 1) {
    // Single character string.
    // After the previous speedup, the character can't be an equality.
    return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
  }

  // Check to see if the problem can be split in two.
  var hm = this.diff_halfMatch_(text1, text2);
  if (hm) {
    // A half-match was found, sort out the return data.
    var text1_a = hm[0];
    var text1_b = hm[1];
    var text2_a = hm[2];
    var text2_b = hm[3];
    var mid_common = hm[4];
    // Send both pairs off for separate processing.
    var diffs_a = this.diff_main(text1_a, text2_a, checklines, deadline);
    var diffs_b = this.diff_main(text1_b, text2_b, checklines, deadline);
    // Merge the results.
    return diffs_a.concat([[DIFF_EQUAL, mid_common]], diffs_b);
  }

  if (checklines && text1.length > 100 && text2.length > 100) {
    return this.diff_lineMode_(text1, text2, deadline);
  }

  return this.diff_bisect_(text1, text2, deadline);
};


/**
 * Do a quick line-level diff on both strings, then rediff the parts for
 * greater accuracy.
 * This speedup can produce non-minimal diffs.
 * @param {string} text1 Old string to be diffed.
 * @param {string} text2 New string to be diffed.
 * @param {number} deadline Time when the diff should be complete by.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 * @private
 */
diff_match_patch.prototype.diff_lineMode_ = function(text1, text2, deadline) {
  // Scan the text on a line-by-line basis first.
  var a = this.diff_linesToChars_(text1, text2);
  text1 = a.chars1;
  text2 = a.chars2;
  var linearray = a.lineArray;

  var diffs = this.diff_main(text1, text2, false, deadline);

  // Convert the diff back to original text.
  this.diff_charsToLines_(diffs, linearray);
  // Eliminate freak matches (e.g. blank lines)
  this.diff_cleanupSemantic(diffs);

  // Rediff any replacement blocks, this time character-by-character.
  // Add a dummy entry at the end.
  diffs.push([DIFF_EQUAL, '']);
  var pointer = 0;
  var count_delete = 0;
  var count_insert = 0;
  var text_delete = '';
  var text_insert = '';
  while (pointer < diffs.length) {
    switch (diffs[pointer][0]) {
      case DIFF_INSERT:
        count_insert++;
        text_insert += diffs[pointer][1];
        break;
      case DIFF_DELETE:
        count_delete++;
        text_delete += diffs[pointer][1];
        break;
      case DIFF_EQUAL:
        // Upon reaching an equality, check for prior redundancies.
        if (count_delete >= 1 && count_insert >= 1) {
          // Delete the offending records and add the merged ones.
          diffs.splice(pointer - count_delete - count_insert,
                       count_delete + count_insert);
          pointer = pointer - count_delete - count_insert;
          var a = this.diff_main(text_delete, text_insert, false, deadline);
          for (var j = a.length - 1; j >= 0; j--) {
            diffs.splice(pointer, 0, a[j]);
          }
          pointer = pointer + a.length;
        }
        count_insert = 0;
        count_delete = 0;
        text_delete = '';
        text_insert = '';
        break;
    }
    pointer++;
  }
  diffs.pop();  // Remove the dummy entry at the end.

  return diffs;
};


/**
 * Find the 'middle snake' of a diff, split the problem in two
 * and return the recursively constructed diff.
 * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.
 * @param {string} text1 Old string to be diffed.
 * @param {string} text2 New string to be diffed.
 * @param {number} deadline Time at which to bail if not yet complete.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 * @private
 */
diff_match_patch.prototype.diff_bisect_ = function(text1, text2, deadline) {
  // Cache the text lengths to prevent multiple calls.
  var text1_length = text1.length;
  var text2_length = text2.length;
  var max_d = Math.ceil((text1_length + text2_length) / 2);
  var v_offset = max_d;
  var v_length = 2 * max_d;
  var v1 = new Array(v_length);
  var v2 = new Array(v_length);
  // Setting all elements to -1 is faster in Chrome & Firefox than mixing
  // integers and undefined.
  for (var x = 0; x < v_length; x++) {
    v1[x] = -1;
    v2[x] = -1;
  }
  v1[v_offset + 1] = 0;
  v2[v_offset + 1] = 0;
  var delta = text1_length - text2_length;
  // If the total number of characters is odd, then the front path will collide
  // with the reverse path.
  var front = (delta % 2 != 0);
  // Offsets for start and end of k loop.
  // Prevents mapping of space beyond the grid.
  var k1start = 0;
  var k1end = 0;
  var k2start = 0;
  var k2end = 0;
  for (var d = 0; d < max_d; d++) {
    // Bail out if deadline is reached.
    if ((new Date()).getTime() > deadline) {
      break;
    }

    // Walk the front path one step.
    for (var k1 = -d + k1start; k1 <= d - k1end; k1 += 2) {
      var k1_offset = v_offset + k1;
      var x1;
      if (k1 == -d || (k1 != d && v1[k1_offset - 1] < v1[k1_offset + 1])) {
        x1 = v1[k1_offset + 1];
      } else {
        x1 = v1[k1_offset - 1] + 1;
      }
      var y1 = x1 - k1;
      while (x1 < text1_length && y1 < text2_length &&
             text1.charAt(x1) == text2.charAt(y1)) {
        x1++;
        y1++;
      }
      v1[k1_offset] = x1;
      if (x1 > text1_length) {
        // Ran off the right of the graph.
        k1end += 2;
      } else if (y1 > text2_length) {
        // Ran off the bottom of the graph.
        k1start += 2;
      } else if (front) {
        var k2_offset = v_offset + delta - k1;
        if (k2_offset >= 0 && k2_offset < v_length && v2[k2_offset] != -1) {
          // Mirror x2 onto top-left coordinate system.
          var x2 = text1_length - v2[k2_offset];
          if (x1 >= x2) {
            // Overlap detected.
            return this.diff_bisectSplit_(text1, text2, x1, y1, deadline);
          }
        }
      }
    }

    // Walk the reverse path one step.
    for (var k2 = -d + k2start; k2 <= d - k2end; k2 += 2) {
      var k2_offset = v_offset + k2;
      var x2;
      if (k2 == -d || (k2 != d && v2[k2_offset - 1] < v2[k2_offset + 1])) {
        x2 = v2[k2_offset + 1];
      } else {
        x2 = v2[k2_offset - 1] + 1;
      }
      var y2 = x2 - k2;
      while (x2 < text1_length && y2 < text2_length &&
             text1.charAt(text1_length - x2 - 1) ==
             text2.charAt(text2_length - y2 - 1)) {
        x2++;
        y2++;
      }
      v2[k2_offset] = x2;
      if (x2 > text1_length) {
        // Ran off the left of the graph.
        k2end += 2;
      } else if (y2 > text2_length) {
        // Ran off the top of the graph.
        k2start += 2;
      } else if (!front) {
        var k1_offset = v_offset + delta - k2;
        if (k1_offset >= 0 && k1_offset < v_length && v1[k1_offset] != -1) {
          var x1 = v1[k1_offset];
          var y1 = v_offset + x1 - k1_offset;
          // Mirror x2 onto top-left coordinate system.
          x2 = text1_length - x2;
          if (x1 >= x2) {
            // Overlap detected.
            return this.diff_bisectSplit_(text1, text2, x1, y1, deadline);
          }
        }
      }
    }
  }
  // Diff took too long and hit the deadline or
  // number of diffs equals number of characters, no commonality at all.
  return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
};


/**
 * Given the location of the 'middle snake', split the diff in two parts
 * and recurse.
 * @param {string} text1 Old string to be diffed.
 * @param {string} text2 New string to be diffed.
 * @param {number} x Index of split point in text1.
 * @param {number} y Index of split point in text2.
 * @param {number} deadline Time at which to bail if not yet complete.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 * @private
 */
diff_match_patch.prototype.diff_bisectSplit_ = function(text1, text2, x, y,
    deadline) {
  var text1a = text1.substring(0, x);
  var text2a = text2.substring(0, y);
  var text1b = text1.substring(x);
  var text2b = text2.substring(y);

  // Compute both diffs serially.
  var diffs = this.diff_main(text1a, text2a, false, deadline);
  var diffsb = this.diff_main(text1b, text2b, false, deadline);

  return diffs.concat(diffsb);
};


/**
 * Split two texts into an array of strings.  Reduce the texts to a string of
 * hashes where each Unicode character represents one line.
 * @param {string} text1 First string.
 * @param {string} text2 Second string.
 * @return {{chars1: string, chars2: string, lineArray: !Array.<string>}}
 *     An object containing the encoded text1, the encoded text2 and
 *     the array of unique strings.
 *     The zeroth element of the array of unique strings is intentionally blank.
 * @private
 */
diff_match_patch.prototype.diff_linesToChars_ = function(text1, text2) {
  var lineArray = [];  // e.g. lineArray[4] == 'Hello\n'
  var lineHash = {};   // e.g. lineHash['Hello\n'] == 4

  // '\x00' is a valid character, but various debuggers don't like it.
  // So we'll insert a junk entry to avoid generating a null character.
  lineArray[0] = '';

  /**
   * Split a text into an array of strings.  Reduce the texts to a string of
   * hashes where each Unicode character represents one line.
   * Modifies linearray and linehash through being a closure.
   * @param {string} text String to encode.
   * @return {string} Encoded string.
   * @private
   */
  function diff_linesToCharsMunge_(text) {
    var chars = '';
    // Walk the text, pulling out a substring for each line.
    // text.split('\n') would would temporarily double our memory footprint.
    // Modifying text would create many large strings to garbage collect.
    var lineStart = 0;
    var lineEnd = -1;
    // Keeping our own length variable is faster than looking it up.
    var lineArrayLength = lineArray.length;
    while (lineEnd < text.length - 1) {
      lineEnd = text.indexOf('\n', lineStart);
      if (lineEnd == -1) {
        lineEnd = text.length - 1;
      }
      var line = text.substring(lineStart, lineEnd + 1);
      lineStart = lineEnd + 1;

      if (lineHash.hasOwnProperty ? lineHash.hasOwnProperty(line) :
          (lineHash[line] !== undefined)) {
        chars += String.fromCharCode(lineHash[line]);
      } else {
        chars += String.fromCharCode(lineArrayLength);
        lineHash[line] = lineArrayLength;
        lineArray[lineArrayLength++] = line;
      }
    }
    return chars;
  }

  var chars1 = diff_linesToCharsMunge_(text1);
  var chars2 = diff_linesToCharsMunge_(text2);
  return {chars1: chars1, chars2: chars2, lineArray: lineArray};
};


/**
 * Rehydrate the text in a diff from a string of line hashes to real lines of
 * text.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @param {!Array.<string>} lineArray Array of unique strings.
 * @private
 */
diff_match_patch.prototype.diff_charsToLines_ = function(diffs, lineArray) {
  for (var x = 0; x < diffs.length; x++) {
    var chars = diffs[x][1];
    var text = [];
    for (var y = 0; y < chars.length; y++) {
      text[y] = lineArray[chars.charCodeAt(y)];
    }
    diffs[x][1] = text.join('');
  }
};


/**
 * Determine the common prefix of two strings.
 * @param {string} text1 First string.
 * @param {string} text2 Second string.
 * @return {number} The number of characters common to the start of each
 *     string.
 */
diff_match_patch.prototype.diff_commonPrefix = function(text1, text2) {
  // Quick check for common null cases.
  if (!text1 || !text2 || text1.charAt(0) != text2.charAt(0)) {
    return 0;
  }
  // Binary search.
  // Performance analysis: http://neil.fraser.name/news/2007/10/09/
  var pointermin = 0;
  var pointermax = Math.min(text1.length, text2.length);
  var pointermid = pointermax;
  var pointerstart = 0;
  while (pointermin < pointermid) {
    if (text1.substring(pointerstart, pointermid) ==
        text2.substring(pointerstart, pointermid)) {
      pointermin = pointermid;
      pointerstart = pointermin;
    } else {
      pointermax = pointermid;
    }
    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
  }
  return pointermid;
};


/**
 * Determine the common suffix of two strings.
 * @param {string} text1 First string.
 * @param {string} text2 Second string.
 * @return {number} The number of characters common to the end of each string.
 */
diff_match_patch.prototype.diff_commonSuffix = function(text1, text2) {
  // Quick check for common null cases.
  if (!text1 || !text2 ||
      text1.charAt(text1.length - 1) != text2.charAt(text2.length - 1)) {
    return 0;
  }
  // Binary search.
  // Performance analysis: http://neil.fraser.name/news/2007/10/09/
  var pointermin = 0;
  var pointermax = Math.min(text1.length, text2.length);
  var pointermid = pointermax;
  var pointerend = 0;
  while (pointermin < pointermid) {
    if (text1.substring(text1.length - pointermid, text1.length - pointerend) ==
        text2.substring(text2.length - pointermid, text2.length - pointerend)) {
      pointermin = pointermid;
      pointerend = pointermin;
    } else {
      pointermax = pointermid;
    }
    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);
  }
  return pointermid;
};


/**
 * Determine if the suffix of one string is the prefix of another.
 * @param {string} text1 First string.
 * @param {string} text2 Second string.
 * @return {number} The number of characters common to the end of the first
 *     string and the start of the second string.
 * @private
 */
diff_match_patch.prototype.diff_commonOverlap_ = function(text1, text2) {
  // Cache the text lengths to prevent multiple calls.
  var text1_length = text1.length;
  var text2_length = text2.length;
  // Eliminate the null case.
  if (text1_length == 0 || text2_length == 0) {
    return 0;
  }
  // Truncate the longer string.
  if (text1_length > text2_length) {
    text1 = text1.substring(text1_length - text2_length);
  } else if (text1_length < text2_length) {
    text2 = text2.substring(0, text1_length);
  }
  var text_length = Math.min(text1_length, text2_length);
  // Quick check for the worst case.
  if (text1 == text2) {
    return text_length;
  }

  // Start by looking for a single character match
  // and increase length until no match is found.
  // Performance analysis: http://neil.fraser.name/news/2010/11/04/
  var best = 0;
  var length = 1;
  while (true) {
    var pattern = text1.substring(text_length - length);
    var found = text2.indexOf(pattern);
    if (found == -1) {
      return best;
    }
    length += found;
    if (found == 0 || text1.substring(text_length - length) ==
        text2.substring(0, length)) {
      best = length;
      length++;
    }
  }
};


/**
 * Do the two texts share a substring which is at least half the length of the
 * longer text?
 * This speedup can produce non-minimal diffs.
 * @param {string} text1 First string.
 * @param {string} text2 Second string.
 * @return {Array.<string>} Five element Array, containing the prefix of
 *     text1, the suffix of text1, the prefix of text2, the suffix of
 *     text2 and the common middle.  Or null if there was no match.
 * @private
 */
diff_match_patch.prototype.diff_halfMatch_ = function(text1, text2) {
  if (this.Diff_Timeout <= 0) {
    // Don't risk returning a non-optimal diff if we have unlimited time.
    return null;
  }
  var longtext = text1.length > text2.length ? text1 : text2;
  var shorttext = text1.length > text2.length ? text2 : text1;
  if (longtext.length < 4 || shorttext.length * 2 < longtext.length) {
    return null;  // Pointless.
  }
  var dmp = this;  // 'this' becomes 'window' in a closure.

  /**
   * Does a substring of shorttext exist within longtext such that the substring
   * is at least half the length of longtext?
   * Closure, but does not reference any external variables.
   * @param {string} longtext Longer string.
   * @param {string} shorttext Shorter string.
   * @param {number} i Start index of quarter length substring within longtext.
   * @return {Array.<string>} Five element Array, containing the prefix of
   *     longtext, the suffix of longtext, the prefix of shorttext, the suffix
   *     of shorttext and the common middle.  Or null if there was no match.
   * @private
   */
  function diff_halfMatchI_(longtext, shorttext, i) {
    // Start with a 1/4 length substring at position i as a seed.
    var seed = longtext.substring(i, i + Math.floor(longtext.length / 4));
    var j = -1;
    var best_common = '';
    var best_longtext_a, best_longtext_b, best_shorttext_a, best_shorttext_b;
    while ((j = shorttext.indexOf(seed, j + 1)) != -1) {
      var prefixLength = dmp.diff_commonPrefix(longtext.substring(i),
                                               shorttext.substring(j));
      var suffixLength = dmp.diff_commonSuffix(longtext.substring(0, i),
                                               shorttext.substring(0, j));
      if (best_common.length < suffixLength + prefixLength) {
        best_common = shorttext.substring(j - suffixLength, j) +
            shorttext.substring(j, j + prefixLength);
        best_longtext_a = longtext.substring(0, i - suffixLength);
        best_longtext_b = longtext.substring(i + prefixLength);
        best_shorttext_a = shorttext.substring(0, j - suffixLength);
        best_shorttext_b = shorttext.substring(j + prefixLength);
      }
    }
    if (best_common.length * 2 >= longtext.length) {
      return [best_longtext_a, best_longtext_b,
              best_shorttext_a, best_shorttext_b, best_common];
    } else {
      return null;
    }
  }

  // First check if the second quarter is the seed for a half-match.
  var hm1 = diff_halfMatchI_(longtext, shorttext,
                             Math.ceil(longtext.length / 4));
  // Check again based on the third quarter.
  var hm2 = diff_halfMatchI_(longtext, shorttext,
                             Math.ceil(longtext.length / 2));
  var hm;
  if (!hm1 && !hm2) {
    return null;
  } else if (!hm2) {
    hm = hm1;
  } else if (!hm1) {
    hm = hm2;
  } else {
    // Both matched.  Select the longest.
    hm = hm1[4].length > hm2[4].length ? hm1 : hm2;
  }

  // A half-match was found, sort out the return data.
  var text1_a, text1_b, text2_a, text2_b;
  if (text1.length > text2.length) {
    text1_a = hm[0];
    text1_b = hm[1];
    text2_a = hm[2];
    text2_b = hm[3];
  } else {
    text2_a = hm[0];
    text2_b = hm[1];
    text1_a = hm[2];
    text1_b = hm[3];
  }
  var mid_common = hm[4];
  return [text1_a, text1_b, text2_a, text2_b, mid_common];
};


/**
 * Reduce the number of edits by eliminating semantically trivial equalities.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 */
diff_match_patch.prototype.diff_cleanupSemantic = function(diffs) {
  var changes = false;
  var equalities = [];  // Stack of indices where equalities are found.
  var equalitiesLength = 0;  // Keeping our own length var is faster in JS.
  /** @type {?string} */
  var lastequality = null;
  // Always equal to diffs[equalities[equalitiesLength - 1]][1]
  var pointer = 0;  // Index of current position.
  // Number of characters that changed prior to the equality.
  var length_insertions1 = 0;
  var length_deletions1 = 0;
  // Number of characters that changed after the equality.
  var length_insertions2 = 0;
  var length_deletions2 = 0;
  while (pointer < diffs.length) {
    if (diffs[pointer][0] == DIFF_EQUAL) {  // Equality found.
      equalities[equalitiesLength++] = pointer;
      length_insertions1 = length_insertions2;
      length_deletions1 = length_deletions2;
      length_insertions2 = 0;
      length_deletions2 = 0;
      lastequality = diffs[pointer][1];
    } else {  // An insertion or deletion.
      if (diffs[pointer][0] == DIFF_INSERT) {
        length_insertions2 += diffs[pointer][1].length;
      } else {
        length_deletions2 += diffs[pointer][1].length;
      }
      // Eliminate an equality that is smaller or equal to the edits on both
      // sides of it.
      if (lastequality && (lastequality.length <=
          Math.max(length_insertions1, length_deletions1)) &&
          (lastequality.length <= Math.max(length_insertions2,
                                           length_deletions2))) {
        // Duplicate record.
        diffs.splice(equalities[equalitiesLength - 1], 0,
                     [DIFF_DELETE, lastequality]);
        // Change second copy to insert.
        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
        // Throw away the equality we just deleted.
        equalitiesLength--;
        // Throw away the previous equality (it needs to be reevaluated).
        equalitiesLength--;
        pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;
        length_insertions1 = 0;  // Reset the counters.
        length_deletions1 = 0;
        length_insertions2 = 0;
        length_deletions2 = 0;
        lastequality = null;
        changes = true;
      }
    }
    pointer++;
  }

  // Normalize the diff.
  if (changes) {
    this.diff_cleanupMerge(diffs);
  }
  this.diff_cleanupSemanticLossless(diffs);

  // Find any overlaps between deletions and insertions.
  // e.g: <del>abcxxx</del><ins>xxxdef</ins>
  //   -> <del>abc</del>xxx<ins>def</ins>
  // e.g: <del>xxxabc</del><ins>defxxx</ins>
  //   -> <ins>def</ins>xxx<del>abc</del>
  // Only extract an overlap if it is as big as the edit ahead or behind it.
  pointer = 1;
  while (pointer < diffs.length) {
    if (diffs[pointer - 1][0] == DIFF_DELETE &&
        diffs[pointer][0] == DIFF_INSERT) {
      var deletion = diffs[pointer - 1][1];
      var insertion = diffs[pointer][1];
      var overlap_length1 = this.diff_commonOverlap_(deletion, insertion);
      var overlap_length2 = this.diff_commonOverlap_(insertion, deletion);
      if (overlap_length1 >= overlap_length2) {
        if (overlap_length1 >= deletion.length / 2 ||
            overlap_length1 >= insertion.length / 2) {
          // Overlap found.  Insert an equality and trim the surrounding edits.
          diffs.splice(pointer, 0,
              [DIFF_EQUAL, insertion.substring(0, overlap_length1)]);
          diffs[pointer - 1][1] =
              deletion.substring(0, deletion.length - overlap_length1);
          diffs[pointer + 1][1] = insertion.substring(overlap_length1);
          pointer++;
        }
      } else {
        if (overlap_length2 >= deletion.length / 2 ||
            overlap_length2 >= insertion.length / 2) {
          // Reverse overlap found.
          // Insert an equality and swap and trim the surrounding edits.
          diffs.splice(pointer, 0,
              [DIFF_EQUAL, deletion.substring(0, overlap_length2)]);
          diffs[pointer - 1][0] = DIFF_INSERT;
          diffs[pointer - 1][1] =
              insertion.substring(0, insertion.length - overlap_length2);
          diffs[pointer + 1][0] = DIFF_DELETE;
          diffs[pointer + 1][1] =
              deletion.substring(overlap_length2);
          pointer++;
        }
      }
      pointer++;
    }
    pointer++;
  }
};


/**
 * Look for single edits surrounded on both sides by equalities
 * which can be shifted sideways to align the edit to a word boundary.
 * e.g: The c<ins>at c</ins>ame. -> The <ins>cat </ins>came.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 */
diff_match_patch.prototype.diff_cleanupSemanticLossless = function(diffs) {
  /**
   * Given two strings, compute a score representing whether the internal
   * boundary falls on logical boundaries.
   * Scores range from 6 (best) to 0 (worst).
   * Closure, but does not reference any external variables.
   * @param {string} one First string.
   * @param {string} two Second string.
   * @return {number} The score.
   * @private
   */
  function diff_cleanupSemanticScore_(one, two) {
    if (!one || !two) {
      // Edges are the best.
      return 6;
    }

    // Each port of this function behaves slightly differently due to
    // subtle differences in each language's definition of things like
    // 'whitespace'.  Since this function's purpose is largely cosmetic,
    // the choice has been made to use each language's native features
    // rather than force total conformity.
    var char1 = one.charAt(one.length - 1);
    var char2 = two.charAt(0);
    var nonAlphaNumeric1 = char1.match(diff_match_patch.nonAlphaNumericRegex_);
    var nonAlphaNumeric2 = char2.match(diff_match_patch.nonAlphaNumericRegex_);
    var whitespace1 = nonAlphaNumeric1 &&
        char1.match(diff_match_patch.whitespaceRegex_);
    var whitespace2 = nonAlphaNumeric2 &&
        char2.match(diff_match_patch.whitespaceRegex_);
    var lineBreak1 = whitespace1 &&
        char1.match(diff_match_patch.linebreakRegex_);
    var lineBreak2 = whitespace2 &&
        char2.match(diff_match_patch.linebreakRegex_);
    var blankLine1 = lineBreak1 &&
        one.match(diff_match_patch.blanklineEndRegex_);
    var blankLine2 = lineBreak2 &&
        two.match(diff_match_patch.blanklineStartRegex_);

    if (blankLine1 || blankLine2) {
      // Five points for blank lines.
      return 5;
    } else if (lineBreak1 || lineBreak2) {
      // Four points for line breaks.
      return 4;
    } else if (nonAlphaNumeric1 && !whitespace1 && whitespace2) {
      // Three points for end of sentences.
      return 3;
    } else if (whitespace1 || whitespace2) {
      // Two points for whitespace.
      return 2;
    } else if (nonAlphaNumeric1 || nonAlphaNumeric2) {
      // One point for non-alphanumeric.
      return 1;
    }
    return 0;
  }

  var pointer = 1;
  // Intentionally ignore the first and last element (don't need checking).
  while (pointer < diffs.length - 1) {
    if (diffs[pointer - 1][0] == DIFF_EQUAL &&
        diffs[pointer + 1][0] == DIFF_EQUAL) {
      // This is a single edit surrounded by equalities.
      var equality1 = diffs[pointer - 1][1];
      var edit = diffs[pointer][1];
      var equality2 = diffs[pointer + 1][1];

      // First, shift the edit as far left as possible.
      var commonOffset = this.diff_commonSuffix(equality1, edit);
      if (commonOffset) {
        var commonString = edit.substring(edit.length - commonOffset);
        equality1 = equality1.substring(0, equality1.length - commonOffset);
        edit = commonString + edit.substring(0, edit.length - commonOffset);
        equality2 = commonString + equality2;
      }

      // Second, step character by character right, looking for the best fit.
      var bestEquality1 = equality1;
      var bestEdit = edit;
      var bestEquality2 = equality2;
      var bestScore = diff_cleanupSemanticScore_(equality1, edit) +
          diff_cleanupSemanticScore_(edit, equality2);
      while (edit.charAt(0) === equality2.charAt(0)) {
        equality1 += edit.charAt(0);
        edit = edit.substring(1) + equality2.charAt(0);
        equality2 = equality2.substring(1);
        var score = diff_cleanupSemanticScore_(equality1, edit) +
            diff_cleanupSemanticScore_(edit, equality2);
        // The >= encourages trailing rather than leading whitespace on edits.
        if (score >= bestScore) {
          bestScore = score;
          bestEquality1 = equality1;
          bestEdit = edit;
          bestEquality2 = equality2;
        }
      }

      if (diffs[pointer - 1][1] != bestEquality1) {
        // We have an improvement, save it back to the diff.
        if (bestEquality1) {
          diffs[pointer - 1][1] = bestEquality1;
        } else {
          diffs.splice(pointer - 1, 1);
          pointer--;
        }
        diffs[pointer][1] = bestEdit;
        if (bestEquality2) {
          diffs[pointer + 1][1] = bestEquality2;
        } else {
          diffs.splice(pointer + 1, 1);
          pointer--;
        }
      }
    }
    pointer++;
  }
};

// Define some regex patterns for matching boundaries.
diff_match_patch.nonAlphaNumericRegex_ = /[^a-zA-Z0-9]/;
diff_match_patch.whitespaceRegex_ = /\s/;
diff_match_patch.linebreakRegex_ = /[\r\n]/;
diff_match_patch.blanklineEndRegex_ = /\n\r?\n$/;
diff_match_patch.blanklineStartRegex_ = /^\r?\n\r?\n/;

/**
 * Reduce the number of edits by eliminating operationally trivial equalities.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 */
diff_match_patch.prototype.diff_cleanupEfficiency = function(diffs) {
  var changes = false;
  var equalities = [];  // Stack of indices where equalities are found.
  var equalitiesLength = 0;  // Keeping our own length var is faster in JS.
  /** @type {?string} */
  var lastequality = null;
  // Always equal to diffs[equalities[equalitiesLength - 1]][1]
  var pointer = 0;  // Index of current position.
  // Is there an insertion operation before the last equality.
  var pre_ins = false;
  // Is there a deletion operation before the last equality.
  var pre_del = false;
  // Is there an insertion operation after the last equality.
  var post_ins = false;
  // Is there a deletion operation after the last equality.
  var post_del = false;
  while (pointer < diffs.length) {
    if (diffs[pointer][0] == DIFF_EQUAL) {  // Equality found.
      if (diffs[pointer][1].length < this.Diff_EditCost &&
          (post_ins || post_del)) {
        // Candidate found.
        equalities[equalitiesLength++] = pointer;
        pre_ins = post_ins;
        pre_del = post_del;
        lastequality = diffs[pointer][1];
      } else {
        // Not a candidate, and can never become one.
        equalitiesLength = 0;
        lastequality = null;
      }
      post_ins = post_del = false;
    } else {  // An insertion or deletion.
      if (diffs[pointer][0] == DIFF_DELETE) {
        post_del = true;
      } else {
        post_ins = true;
      }
      /*
       * Five types to be split:
       * <ins>A</ins><del>B</del>XY<ins>C</ins><del>D</del>
       * <ins>A</ins>X<ins>C</ins><del>D</del>
       * <ins>A</ins><del>B</del>X<ins>C</ins>
       * <ins>A</del>X<ins>C</ins><del>D</del>
       * <ins>A</ins><del>B</del>X<del>C</del>
       */
      if (lastequality && ((pre_ins && pre_del && post_ins && post_del) ||
                           ((lastequality.length < this.Diff_EditCost / 2) &&
                            (pre_ins + pre_del + post_ins + post_del) == 3))) {
        // Duplicate record.
        diffs.splice(equalities[equalitiesLength - 1], 0,
                     [DIFF_DELETE, lastequality]);
        // Change second copy to insert.
        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
        equalitiesLength--;  // Throw away the equality we just deleted;
        lastequality = null;
        if (pre_ins && pre_del) {
          // No changes made which could affect previous entry, keep going.
          post_ins = post_del = true;
          equalitiesLength = 0;
        } else {
          equalitiesLength--;  // Throw away the previous equality.
          pointer = equalitiesLength > 0 ?
              equalities[equalitiesLength - 1] : -1;
          post_ins = post_del = false;
        }
        changes = true;
      }
    }
    pointer++;
  }

  if (changes) {
    this.diff_cleanupMerge(diffs);
  }
};


/**
 * Reorder and merge like edit sections.  Merge equalities.
 * Any edit section can move as long as it doesn't cross an equality.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 */
diff_match_patch.prototype.diff_cleanupMerge = function(diffs) {
  diffs.push([DIFF_EQUAL, '']);  // Add a dummy entry at the end.
  var pointer = 0;
  var count_delete = 0;
  var count_insert = 0;
  var text_delete = '';
  var text_insert = '';
  var commonlength;
  while (pointer < diffs.length) {
    switch (diffs[pointer][0]) {
      case DIFF_INSERT:
        count_insert++;
        text_insert += diffs[pointer][1];
        pointer++;
        break;
      case DIFF_DELETE:
        count_delete++;
        text_delete += diffs[pointer][1];
        pointer++;
        break;
      case DIFF_EQUAL:
        // Upon reaching an equality, check for prior redundancies.
        if (count_delete + count_insert > 1) {
          if (count_delete !== 0 && count_insert !== 0) {
            // Factor out any common prefixies.
            commonlength = this.diff_commonPrefix(text_insert, text_delete);
            if (commonlength !== 0) {
              if ((pointer - count_delete - count_insert) > 0 &&
                  diffs[pointer - count_delete - count_insert - 1][0] ==
                  DIFF_EQUAL) {
                diffs[pointer - count_delete - count_insert - 1][1] +=
                    text_insert.substring(0, commonlength);
              } else {
                diffs.splice(0, 0, [DIFF_EQUAL,
                                    text_insert.substring(0, commonlength)]);
                pointer++;
              }
              text_insert = text_insert.substring(commonlength);
              text_delete = text_delete.substring(commonlength);
            }
            // Factor out any common suffixies.
            commonlength = this.diff_commonSuffix(text_insert, text_delete);
            if (commonlength !== 0) {
              diffs[pointer][1] = text_insert.substring(text_insert.length -
                  commonlength) + diffs[pointer][1];
              text_insert = text_insert.substring(0, text_insert.length -
                  commonlength);
              text_delete = text_delete.substring(0, text_delete.length -
                  commonlength);
            }
          }
          // Delete the offending records and add the merged ones.
          if (count_delete === 0) {
            diffs.splice(pointer - count_insert,
                count_delete + count_insert, [DIFF_INSERT, text_insert]);
          } else if (count_insert === 0) {
            diffs.splice(pointer - count_delete,
                count_delete + count_insert, [DIFF_DELETE, text_delete]);
          } else {
            diffs.splice(pointer - count_delete - count_insert,
                count_delete + count_insert, [DIFF_DELETE, text_delete],
                [DIFF_INSERT, text_insert]);
          }
          pointer = pointer - count_delete - count_insert +
                    (count_delete ? 1 : 0) + (count_insert ? 1 : 0) + 1;
        } else if (pointer !== 0 && diffs[pointer - 1][0] == DIFF_EQUAL) {
          // Merge this equality with the previous one.
          diffs[pointer - 1][1] += diffs[pointer][1];
          diffs.splice(pointer, 1);
        } else {
          pointer++;
        }
        count_insert = 0;
        count_delete = 0;
        text_delete = '';
        text_insert = '';
        break;
    }
  }
  if (diffs[diffs.length - 1][1] === '') {
    diffs.pop();  // Remove the dummy entry at the end.
  }

  // Second pass: look for single edits surrounded on both sides by equalities
  // which can be shifted sideways to eliminate an equality.
  // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC
  var changes = false;
  pointer = 1;
  // Intentionally ignore the first and last element (don't need checking).
  while (pointer < diffs.length - 1) {
    if (diffs[pointer - 1][0] == DIFF_EQUAL &&
        diffs[pointer + 1][0] == DIFF_EQUAL) {
      // This is a single edit surrounded by equalities.
      if (diffs[pointer][1].substring(diffs[pointer][1].length -
          diffs[pointer - 1][1].length) == diffs[pointer - 1][1]) {
        // Shift the edit over the previous equality.
        diffs[pointer][1] = diffs[pointer - 1][1] +
            diffs[pointer][1].substring(0, diffs[pointer][1].length -
                                        diffs[pointer - 1][1].length);
        diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];
        diffs.splice(pointer - 1, 1);
        changes = true;
      } else if (diffs[pointer][1].substring(0, diffs[pointer + 1][1].length) ==
          diffs[pointer + 1][1]) {
        // Shift the edit over the next equality.
        diffs[pointer - 1][1] += diffs[pointer + 1][1];
        diffs[pointer][1] =
            diffs[pointer][1].substring(diffs[pointer + 1][1].length) +
            diffs[pointer + 1][1];
        diffs.splice(pointer + 1, 1);
        changes = true;
      }
    }
    pointer++;
  }
  // If shifts were made, the diff needs reordering and another shift sweep.
  if (changes) {
    this.diff_cleanupMerge(diffs);
  }
};


/**
 * loc is a location in text1, compute and return the equivalent location in
 * text2.
 * e.g. 'The cat' vs 'The big cat', 1->1, 5->8
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @param {number} loc Location within text1.
 * @return {number} Location within text2.
 */
diff_match_patch.prototype.diff_xIndex = function(diffs, loc) {
  var chars1 = 0;
  var chars2 = 0;
  var last_chars1 = 0;
  var last_chars2 = 0;
  var x;
  for (x = 0; x < diffs.length; x++) {
    if (diffs[x][0] !== DIFF_INSERT) {  // Equality or deletion.
      chars1 += diffs[x][1].length;
    }
    if (diffs[x][0] !== DIFF_DELETE) {  // Equality or insertion.
      chars2 += diffs[x][1].length;
    }
    if (chars1 > loc) {  // Overshot the location.
      break;
    }
    last_chars1 = chars1;
    last_chars2 = chars2;
  }
  // Was the location was deleted?
  if (diffs.length != x && diffs[x][0] === DIFF_DELETE) {
    return last_chars2;
  }
  // Add the remaining character length.
  return last_chars2 + (loc - last_chars1);
};


/**
 * Convert a diff array into a pretty HTML report.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @return {string} HTML representation.
 */
diff_match_patch.prototype.diff_prettyHtml = function(diffs) {
  var html = [];
  var pattern_amp = /&/g;
  var pattern_lt = /</g;
  var pattern_gt = />/g;
  var pattern_para = /\n/g;
  for (var x = 0; x < diffs.length; x++) {
    var op = diffs[x][0];    // Operation (insert, delete, equal)
    var data = diffs[x][1];  // Text of change.
    var text = data.replace(pattern_amp, '&amp;').replace(pattern_lt, '&lt;')
        .replace(pattern_gt, '&gt;').replace(pattern_para, '&para;<br>');
    switch (op) {
      case DIFF_INSERT:
        html[x] = '<ins style="background:#e6ffe6;">' + text + '</ins>';
        break;
      case DIFF_DELETE:
        html[x] = '<del style="background:#ffe6e6;">' + text + '</del>';
        break;
      case DIFF_EQUAL:
        html[x] = '<span>' + text + '</span>';
        break;
    }
  }
  return html.join('');
};


/**
 * Compute and return the source text (all equalities and deletions).
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @return {string} Source text.
 */
diff_match_patch.prototype.diff_text1 = function(diffs) {
  var text = [];
  for (var x = 0; x < diffs.length; x++) {
    if (diffs[x][0] !== DIFF_INSERT) {
      text[x] = diffs[x][1];
    }
  }
  return text.join('');
};


/**
 * Compute and return the destination text (all equalities and insertions).
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @return {string} Destination text.
 */
diff_match_patch.prototype.diff_text2 = function(diffs) {
  var text = [];
  for (var x = 0; x < diffs.length; x++) {
    if (diffs[x][0] !== DIFF_DELETE) {
      text[x] = diffs[x][1];
    }
  }
  return text.join('');
};


/**
 * Compute the Levenshtein distance; the number of inserted, deleted or
 * substituted characters.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @return {number} Number of changes.
 */
diff_match_patch.prototype.diff_levenshtein = function(diffs) {
  var levenshtein = 0;
  var insertions = 0;
  var deletions = 0;
  for (var x = 0; x < diffs.length; x++) {
    var op = diffs[x][0];
    var data = diffs[x][1];
    switch (op) {
      case DIFF_INSERT:
        insertions += data.length;
        break;
      case DIFF_DELETE:
        deletions += data.length;
        break;
      case DIFF_EQUAL:
        // A deletion and an insertion is one substitution.
        levenshtein += Math.max(insertions, deletions);
        insertions = 0;
        deletions = 0;
        break;
    }
  }
  levenshtein += Math.max(insertions, deletions);
  return levenshtein;
};


/**
 * Crush the diff into an encoded string which describes the operations
 * required to transform text1 into text2.
 * E.g. =3\t-2\t+ing  -> Keep 3 chars, delete 2 chars, insert 'ing'.
 * Operations are tab-separated.  Inserted text is escaped using %xx notation.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 * @return {string} Delta text.
 */
diff_match_patch.prototype.diff_toDelta = function(diffs) {
  var text = [];
  for (var x = 0; x < diffs.length; x++) {
    switch (diffs[x][0]) {
      case DIFF_INSERT:
        text[x] = '+' + encodeURI(diffs[x][1]);
        break;
      case DIFF_DELETE:
        text[x] = '-' + diffs[x][1].length;
        break;
      case DIFF_EQUAL:
        text[x] = '=' + diffs[x][1].length;
        break;
    }
  }
  return text.join('\t').replace(/%20/g, ' ');
};


/**
 * Given the original text1, and an encoded string which describes the
 * operations required to transform text1 into text2, compute the full diff.
 * @param {string} text1 Source string for the diff.
 * @param {string} delta Delta text.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 * @throws {!Error} If invalid input.
 */
diff_match_patch.prototype.diff_fromDelta = function(text1, delta) {
  var diffs = [];
  var diffsLength = 0;  // Keeping our own length var is faster in JS.
  var pointer = 0;  // Cursor in text1
  var tokens = delta.split(/\t/g);
  for (var x = 0; x < tokens.length; x++) {
    // Each token begins with a one character parameter which specifies the
    // operation of this token (delete, insert, equality).
    var param = tokens[x].substring(1);
    switch (tokens[x].charAt(0)) {
      case '+':
        try {
          diffs[diffsLength++] = [DIFF_INSERT, decodeURI(param)];
        } catch (ex) {
          // Malformed URI sequence.
          throw new Error('Illegal escape in diff_fromDelta: ' + param);
        }
        break;
      case '-':
        // Fall through.
      case '=':
        var n = parseInt(param, 10);
        if (isNaN(n) || n < 0) {
          throw new Error('Invalid number in diff_fromDelta: ' + param);
        }
        var text = text1.substring(pointer, pointer += n);
        if (tokens[x].charAt(0) == '=') {
          diffs[diffsLength++] = [DIFF_EQUAL, text];
        } else {
          diffs[diffsLength++] = [DIFF_DELETE, text];
        }
        break;
      default:
        // Blank tokens are ok (from a trailing \t).
        // Anything else is an error.
        if (tokens[x]) {
          throw new Error('Invalid diff operation in diff_fromDelta: ' +
                          tokens[x]);
        }
    }
  }
  if (pointer != text1.length) {
    throw new Error('Delta length (' + pointer +
        ') does not equal source text length (' + text1.length + ').');
  }
  return diffs;
};


//  MATCH FUNCTIONS


/**
 * Locate the best instance of 'pattern' in 'text' near 'loc'.
 * @param {string} text The text to search.
 * @param {string} pattern The pattern to search for.
 * @param {number} loc The location to search around.
 * @return {number} Best match index or -1.
 */
diff_match_patch.prototype.match_main = function(text, pattern, loc) {
  // Check for null inputs.
  if (text == null || pattern == null || loc == null) {
    throw new Error('Null input. (match_main)');
  }

  loc = Math.max(0, Math.min(loc, text.length));
  if (text == pattern) {
    // Shortcut (potentially not guaranteed by the algorithm)
    return 0;
  } else if (!text.length) {
    // Nothing to match.
    return -1;
  } else if (text.substring(loc, loc + pattern.length) == pattern) {
    // Perfect match at the perfect spot!  (Includes case of null pattern)
    return loc;
  } else {
    // Do a fuzzy compare.
    return this.match_bitap_(text, pattern, loc);
  }
};


/**
 * Locate the best instance of 'pattern' in 'text' near 'loc' using the
 * Bitap algorithm.
 * @param {string} text The text to search.
 * @param {string} pattern The pattern to search for.
 * @param {number} loc The location to search around.
 * @return {number} Best match index or -1.
 * @private
 */
diff_match_patch.prototype.match_bitap_ = function(text, pattern, loc) {
  if (pattern.length > this.Match_MaxBits) {
    throw new Error('Pattern too long for this browser.');
  }

  // Initialise the alphabet.
  var s = this.match_alphabet_(pattern);

  var dmp = this;  // 'this' becomes 'window' in a closure.

  /**
   * Compute and return the score for a match with e errors and x location.
   * Accesses loc and pattern through being a closure.
   * @param {number} e Number of errors in match.
   * @param {number} x Location of match.
   * @return {number} Overall score for match (0.0 = good, 1.0 = bad).
   * @private
   */
  function match_bitapScore_(e, x) {
    var accuracy = e / pattern.length;
    var proximity = Math.abs(loc - x);
    if (!dmp.Match_Distance) {
      // Dodge divide by zero error.
      return proximity ? 1.0 : accuracy;
    }
    return accuracy + (proximity / dmp.Match_Distance);
  }

  // Highest score beyond which we give up.
  var score_threshold = this.Match_Threshold;
  // Is there a nearby exact match? (speedup)
  var best_loc = text.indexOf(pattern, loc);
  if (best_loc != -1) {
    score_threshold = Math.min(match_bitapScore_(0, best_loc), score_threshold);
    // What about in the other direction? (speedup)
    best_loc = text.lastIndexOf(pattern, loc + pattern.length);
    if (best_loc != -1) {
      score_threshold =
          Math.min(match_bitapScore_(0, best_loc), score_threshold);
    }
  }

  // Initialise the bit arrays.
  var matchmask = 1 << (pattern.length - 1);
  best_loc = -1;

  var bin_min, bin_mid;
  var bin_max = pattern.length + text.length;
  var last_rd;
  for (var d = 0; d < pattern.length; d++) {
    // Scan for the best match; each iteration allows for one more error.
    // Run a binary search to determine how far from 'loc' we can stray at this
    // error level.
    bin_min = 0;
    bin_mid = bin_max;
    while (bin_min < bin_mid) {
      if (match_bitapScore_(d, loc + bin_mid) <= score_threshold) {
        bin_min = bin_mid;
      } else {
        bin_max = bin_mid;
      }
      bin_mid = Math.floor((bin_max - bin_min) / 2 + bin_min);
    }
    // Use the result from this iteration as the maximum for the next.
    bin_max = bin_mid;
    var start = Math.max(1, loc - bin_mid + 1);
    var finish = Math.min(loc + bin_mid, text.length) + pattern.length;

    var rd = Array(finish + 2);
    rd[finish + 1] = (1 << d) - 1;
    for (var j = finish; j >= start; j--) {
      // The alphabet (s) is a sparse hash, so the following line generates
      // warnings.
      var charMatch = s[text.charAt(j - 1)];
      if (d === 0) {  // First pass: exact match.
        rd[j] = ((rd[j + 1] << 1) | 1) & charMatch;
      } else {  // Subsequent passes: fuzzy match.
        rd[j] = (((rd[j + 1] << 1) | 1) & charMatch) |
                (((last_rd[j + 1] | last_rd[j]) << 1) | 1) |
                last_rd[j + 1];
      }
      if (rd[j] & matchmask) {
        var score = match_bitapScore_(d, j - 1);
        // This match will almost certainly be better than any existing match.
        // But check anyway.
        if (score <= score_threshold) {
          // Told you so.
          score_threshold = score;
          best_loc = j - 1;
          if (best_loc > loc) {
            // When passing loc, don't exceed our current distance from loc.
            start = Math.max(1, 2 * loc - best_loc);
          } else {
            // Already passed loc, downhill from here on in.
            break;
          }
        }
      }
    }
    // No hope for a (better) match at greater error levels.
    if (match_bitapScore_(d + 1, loc) > score_threshold) {
      break;
    }
    last_rd = rd;
  }
  return best_loc;
};


/**
 * Initialise the alphabet for the Bitap algorithm.
 * @param {string} pattern The text to encode.
 * @return {!Object} Hash of character locations.
 * @private
 */
diff_match_patch.prototype.match_alphabet_ = function(pattern) {
  var s = {};
  for (var i = 0; i < pattern.length; i++) {
    s[pattern.charAt(i)] = 0;
  }
  for (var i = 0; i < pattern.length; i++) {
    s[pattern.charAt(i)] |= 1 << (pattern.length - i - 1);
  }
  return s;
};


//  PATCH FUNCTIONS


/**
 * Increase the context until it is unique,
 * but don't let the pattern expand beyond Match_MaxBits.
 * @param {!diff_match_patch.patch_obj} patch The patch to grow.
 * @param {string} text Source text.
 * @private
 */
diff_match_patch.prototype.patch_addContext_ = function(patch, text) {
  if (text.length == 0) {
    return;
  }
  var pattern = text.substring(patch.start2, patch.start2 + patch.length1);
  var padding = 0;

  // Look for the first and last matches of pattern in text.  If two different
  // matches are found, increase the pattern length.
  while (text.indexOf(pattern) != text.lastIndexOf(pattern) &&
         pattern.length < this.Match_MaxBits - this.Patch_Margin -
         this.Patch_Margin) {
    padding += this.Patch_Margin;
    pattern = text.substring(patch.start2 - padding,
                             patch.start2 + patch.length1 + padding);
  }
  // Add one chunk for good luck.
  padding += this.Patch_Margin;

  // Add the prefix.
  var prefix = text.substring(patch.start2 - padding, patch.start2);
  if (prefix) {
    patch.diffs.unshift([DIFF_EQUAL, prefix]);
  }
  // Add the suffix.
  var suffix = text.substring(patch.start2 + patch.length1,
                              patch.start2 + patch.length1 + padding);
  if (suffix) {
    patch.diffs.push([DIFF_EQUAL, suffix]);
  }

  // Roll back the start points.
  patch.start1 -= prefix.length;
  patch.start2 -= prefix.length;
  // Extend the lengths.
  patch.length1 += prefix.length + suffix.length;
  patch.length2 += prefix.length + suffix.length;
};


/**
 * Compute a list of patches to turn text1 into text2.
 * Use diffs if provided, otherwise compute it ourselves.
 * There are four ways to call this function, depending on what data is
 * available to the caller:
 * Method 1:
 * a = text1, b = text2
 * Method 2:
 * a = diffs
 * Method 3 (optimal):
 * a = text1, b = diffs
 * Method 4 (deprecated, use method 3):
 * a = text1, b = text2, c = diffs
 *
 * @param {string|!Array.<!diff_match_patch.Diff>} a text1 (methods 1,3,4) or
 * Array of diff tuples for text1 to text2 (method 2).
 * @param {string|!Array.<!diff_match_patch.Diff>} opt_b text2 (methods 1,4) or
 * Array of diff tuples for text1 to text2 (method 3) or undefined (method 2).
 * @param {string|!Array.<!diff_match_patch.Diff>} opt_c Array of diff tuples
 * for text1 to text2 (method 4) or undefined (methods 1,2,3).
 * @return {!Array.<!diff_match_patch.patch_obj>} Array of Patch objects.
 */
diff_match_patch.prototype.patch_make = function(a, opt_b, opt_c) {
  var text1, diffs;
  if (typeof a == 'string' && typeof opt_b == 'string' &&
      typeof opt_c == 'undefined') {
    // Method 1: text1, text2
    // Compute diffs from text1 and text2.
    text1 = /** @type {string} */(a);
    diffs = this.diff_main(text1, /** @type {string} */(opt_b), true);
    if (diffs.length > 2) {
      this.diff_cleanupSemantic(diffs);
      this.diff_cleanupEfficiency(diffs);
    }
  } else if (a && typeof a == 'object' && typeof opt_b == 'undefined' &&
      typeof opt_c == 'undefined') {
    // Method 2: diffs
    // Compute text1 from diffs.
    diffs = /** @type {!Array.<!diff_match_patch.Diff>} */(a);
    text1 = this.diff_text1(diffs);
  } else if (typeof a == 'string' && opt_b && typeof opt_b == 'object' &&
      typeof opt_c == 'undefined') {
    // Method 3: text1, diffs
    text1 = /** @type {string} */(a);
    diffs = /** @type {!Array.<!diff_match_patch.Diff>} */(opt_b);
  } else if (typeof a == 'string' && typeof opt_b == 'string' &&
      opt_c && typeof opt_c == 'object') {
    // Method 4: text1, text2, diffs
    // text2 is not used.
    text1 = /** @type {string} */(a);
    diffs = /** @type {!Array.<!diff_match_patch.Diff>} */(opt_c);
  } else {
    throw new Error('Unknown call format to patch_make.');
  }

  if (diffs.length === 0) {
    return [];  // Get rid of the null case.
  }
  var patches = [];
  var patch = new diff_match_patch.patch_obj();
  var patchDiffLength = 0;  // Keeping our own length var is faster in JS.
  var char_count1 = 0;  // Number of characters into the text1 string.
  var char_count2 = 0;  // Number of characters into the text2 string.
  // Start with text1 (prepatch_text) and apply the diffs until we arrive at
  // text2 (postpatch_text).  We recreate the patches one by one to determine
  // context info.
  var prepatch_text = text1;
  var postpatch_text = text1;
  for (var x = 0; x < diffs.length; x++) {
    var diff_type = diffs[x][0];
    var diff_text = diffs[x][1];

    if (!patchDiffLength && diff_type !== DIFF_EQUAL) {
      // A new patch starts here.
      patch.start1 = char_count1;
      patch.start2 = char_count2;
    }

    switch (diff_type) {
      case DIFF_INSERT:
        patch.diffs[patchDiffLength++] = diffs[x];
        patch.length2 += diff_text.length;
        postpatch_text = postpatch_text.substring(0, char_count2) + diff_text +
                         postpatch_text.substring(char_count2);
        break;
      case DIFF_DELETE:
        patch.length1 += diff_text.length;
        patch.diffs[patchDiffLength++] = diffs[x];
        postpatch_text = postpatch_text.substring(0, char_count2) +
                         postpatch_text.substring(char_count2 +
                             diff_text.length);
        break;
      case DIFF_EQUAL:
        if (diff_text.length <= 2 * this.Patch_Margin &&
            patchDiffLength && diffs.length != x + 1) {
          // Small equality inside a patch.
          patch.diffs[patchDiffLength++] = diffs[x];
          patch.length1 += diff_text.length;
          patch.length2 += diff_text.length;
        } else if (diff_text.length >= 2 * this.Patch_Margin) {
          // Time for a new patch.
          if (patchDiffLength) {
            this.patch_addContext_(patch, prepatch_text);
            patches.push(patch);
            patch = new diff_match_patch.patch_obj();
            patchDiffLength = 0;
            // Unlike Unidiff, our patch lists have a rolling context.
            // http://code.google.com/p/google-diff-match-patch/wiki/Unidiff
            // Update prepatch text & pos to reflect the application of the
            // just completed patch.
            prepatch_text = postpatch_text;
            char_count1 = char_count2;
          }
        }
        break;
    }

    // Update the current character count.
    if (diff_type !== DIFF_INSERT) {
      char_count1 += diff_text.length;
    }
    if (diff_type !== DIFF_DELETE) {
      char_count2 += diff_text.length;
    }
  }
  // Pick up the leftover patch if not empty.
  if (patchDiffLength) {
    this.patch_addContext_(patch, prepatch_text);
    patches.push(patch);
  }

  return patches;
};


/**
 * Given an array of patches, return another array that is identical.
 * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of Patch objects.
 * @return {!Array.<!diff_match_patch.patch_obj>} Array of Patch objects.
 */
diff_match_patch.prototype.patch_deepCopy = function(patches) {
  // Making deep copies is hard in JavaScript.
  var patchesCopy = [];
  for (var x = 0; x < patches.length; x++) {
    var patch = patches[x];
    var patchCopy = new diff_match_patch.patch_obj();
    patchCopy.diffs = [];
    for (var y = 0; y < patch.diffs.length; y++) {
      patchCopy.diffs[y] = patch.diffs[y].slice();
    }
    patchCopy.start1 = patch.start1;
    patchCopy.start2 = patch.start2;
    patchCopy.length1 = patch.length1;
    patchCopy.length2 = patch.length2;
    patchesCopy[x] = patchCopy;
  }
  return patchesCopy;
};


/**
 * Merge a set of patches onto the text.  Return a patched text, as well
 * as a list of true/false values indicating which patches were applied.
 * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of Patch objects.
 * @param {string} text Old text.
 * @return {!Array.<string|!Array.<boolean>>} Two element Array, containing the
 *      new text and an array of boolean values.
 */
diff_match_patch.prototype.patch_apply = function(patches, text) {
  if (patches.length == 0) {
    return [text, []];
  }

  // Deep copy the patches so that no changes are made to originals.
  patches = this.patch_deepCopy(patches);

  var nullPadding = this.patch_addPadding(patches);
  text = nullPadding + text + nullPadding;

  this.patch_splitMax(patches);
  // delta keeps track of the offset between the expected and actual location
  // of the previous patch.  If there are patches expected at positions 10 and
  // 20, but the first patch was found at 12, delta is 2 and the second patch
  // has an effective expected position of 22.
  var delta = 0;
  var results = [];
  for (var x = 0; x < patches.length; x++) {
    var expected_loc = patches[x].start2 + delta;
    var text1 = this.diff_text1(patches[x].diffs);
    var start_loc;
    var end_loc = -1;
    if (text1.length > this.Match_MaxBits) {
      // patch_splitMax will only provide an oversized pattern in the case of
      // a monster delete.
      start_loc = this.match_main(text, text1.substring(0, this.Match_MaxBits),
                                  expected_loc);
      if (start_loc != -1) {
        end_loc = this.match_main(text,
            text1.substring(text1.length - this.Match_MaxBits),
            expected_loc + text1.length - this.Match_MaxBits);
        if (end_loc == -1 || start_loc >= end_loc) {
          // Can't find valid trailing context.  Drop this patch.
          start_loc = -1;
        }
      }
    } else {
      start_loc = this.match_main(text, text1, expected_loc);
    }
    if (start_loc == -1) {
      // No match found.  :(
      results[x] = false;
      // Subtract the delta for this failed patch from subsequent patches.
      delta -= patches[x].length2 - patches[x].length1;
    } else {
      // Found a match.  :)
      results[x] = true;
      delta = start_loc - expected_loc;
      var text2;
      if (end_loc == -1) {
        text2 = text.substring(start_loc, start_loc + text1.length);
      } else {
        text2 = text.substring(start_loc, end_loc + this.Match_MaxBits);
      }
      if (text1 == text2) {
        // Perfect match, just shove the replacement text in.
        text = text.substring(0, start_loc) +
               this.diff_text2(patches[x].diffs) +
               text.substring(start_loc + text1.length);
      } else {
        // Imperfect match.  Run a diff to get a framework of equivalent
        // indices.
        var diffs = this.diff_main(text1, text2, false);
        if (text1.length > this.Match_MaxBits &&
            this.diff_levenshtein(diffs) / text1.length >
            this.Patch_DeleteThreshold) {
          // The end points match, but the content is unacceptably bad.
          results[x] = false;
        } else {
          this.diff_cleanupSemanticLossless(diffs);
          var index1 = 0;
          var index2;
          for (var y = 0; y < patches[x].diffs.length; y++) {
            var mod = patches[x].diffs[y];
            if (mod[0] !== DIFF_EQUAL) {
              index2 = this.diff_xIndex(diffs, index1);
            }
            if (mod[0] === DIFF_INSERT) {  // Insertion
              text = text.substring(0, start_loc + index2) + mod[1] +
                     text.substring(start_loc + index2);
            } else if (mod[0] === DIFF_DELETE) {  // Deletion
              text = text.substring(0, start_loc + index2) +
                     text.substring(start_loc + this.diff_xIndex(diffs,
                         index1 + mod[1].length));
            }
            if (mod[0] !== DIFF_DELETE) {
              index1 += mod[1].length;
            }
          }
        }
      }
    }
  }
  // Strip the padding off.
  text = text.substring(nullPadding.length, text.length - nullPadding.length);
  return [text, results];
};


/**
 * Add some padding on text start and end so that edges can match something.
 * Intended to be called only from within patch_apply.
 * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of Patch objects.
 * @return {string} The padding string added to each side.
 */
diff_match_patch.prototype.patch_addPadding = function(patches) {
  var paddingLength = this.Patch_Margin;
  var nullPadding = '';
  for (var x = 1; x <= paddingLength; x++) {
    nullPadding += String.fromCharCode(x);
  }

  // Bump all the patches forward.
  for (var x = 0; x < patches.length; x++) {
    patches[x].start1 += paddingLength;
    patches[x].start2 += paddingLength;
  }

  // Add some padding on start of first diff.
  var patch = patches[0];
  var diffs = patch.diffs;
  if (diffs.length == 0 || diffs[0][0] != DIFF_EQUAL) {
    // Add nullPadding equality.
    diffs.unshift([DIFF_EQUAL, nullPadding]);
    patch.start1 -= paddingLength;  // Should be 0.
    patch.start2 -= paddingLength;  // Should be 0.
    patch.length1 += paddingLength;
    patch.length2 += paddingLength;
  } else if (paddingLength > diffs[0][1].length) {
    // Grow first equality.
    var extraLength = paddingLength - diffs[0][1].length;
    diffs[0][1] = nullPadding.substring(diffs[0][1].length) + diffs[0][1];
    patch.start1 -= extraLength;
    patch.start2 -= extraLength;
    patch.length1 += extraLength;
    patch.length2 += extraLength;
  }

  // Add some padding on end of last diff.
  patch = patches[patches.length - 1];
  diffs = patch.diffs;
  if (diffs.length == 0 || diffs[diffs.length - 1][0] != DIFF_EQUAL) {
    // Add nullPadding equality.
    diffs.push([DIFF_EQUAL, nullPadding]);
    patch.length1 += paddingLength;
    patch.length2 += paddingLength;
  } else if (paddingLength > diffs[diffs.length - 1][1].length) {
    // Grow last equality.
    var extraLength = paddingLength - diffs[diffs.length - 1][1].length;
    diffs[diffs.length - 1][1] += nullPadding.substring(0, extraLength);
    patch.length1 += extraLength;
    patch.length2 += extraLength;
  }

  return nullPadding;
};


/**
 * Look through the patches and break up any which are longer than the maximum
 * limit of the match algorithm.
 * Intended to be called only from within patch_apply.
 * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of Patch objects.
 */
diff_match_patch.prototype.patch_splitMax = function(patches) {
  var patch_size = this.Match_MaxBits;
  for (var x = 0; x < patches.length; x++) {
    if (patches[x].length1 <= patch_size) {
      continue;
    }
    var bigpatch = patches[x];
    // Remove the big old patch.
    patches.splice(x--, 1);
    var start1 = bigpatch.start1;
    var start2 = bigpatch.start2;
    var precontext = '';
    while (bigpatch.diffs.length !== 0) {
      // Create one of several smaller patches.
      var patch = new diff_match_patch.patch_obj();
      var empty = true;
      patch.start1 = start1 - precontext.length;
      patch.start2 = start2 - precontext.length;
      if (precontext !== '') {
        patch.length1 = patch.length2 = precontext.length;
        patch.diffs.push([DIFF_EQUAL, precontext]);
      }
      while (bigpatch.diffs.length !== 0 &&
             patch.length1 < patch_size - this.Patch_Margin) {
        var diff_type = bigpatch.diffs[0][0];
        var diff_text = bigpatch.diffs[0][1];
        if (diff_type === DIFF_INSERT) {
          // Insertions are harmless.
          patch.length2 += diff_text.length;
          start2 += diff_text.length;
          patch.diffs.push(bigpatch.diffs.shift());
          empty = false;
        } else if (diff_type === DIFF_DELETE && patch.diffs.length == 1 &&
                   patch.diffs[0][0] == DIFF_EQUAL &&
                   diff_text.length > 2 * patch_size) {
          // This is a large deletion.  Let it pass in one chunk.
          patch.length1 += diff_text.length;
          start1 += diff_text.length;
          empty = false;
          patch.diffs.push([diff_type, diff_text]);
          bigpatch.diffs.shift();
        } else {
          // Deletion or equality.  Only take as much as we can stomach.
          diff_text = diff_text.substring(0,
              patch_size - patch.length1 - this.Patch_Margin);
          patch.length1 += diff_text.length;
          start1 += diff_text.length;
          if (diff_type === DIFF_EQUAL) {
            patch.length2 += diff_text.length;
            start2 += diff_text.length;
          } else {
            empty = false;
          }
          patch.diffs.push([diff_type, diff_text]);
          if (diff_text == bigpatch.diffs[0][1]) {
            bigpatch.diffs.shift();
          } else {
            bigpatch.diffs[0][1] =
                bigpatch.diffs[0][1].substring(diff_text.length);
          }
        }
      }
      // Compute the head context for the next patch.
      precontext = this.diff_text2(patch.diffs);
      precontext =
          precontext.substring(precontext.length - this.Patch_Margin);
      // Append the end context for this patch.
      var postcontext = this.diff_text1(bigpatch.diffs)
                            .substring(0, this.Patch_Margin);
      if (postcontext !== '') {
        patch.length1 += postcontext.length;
        patch.length2 += postcontext.length;
        if (patch.diffs.length !== 0 &&
            patch.diffs[patch.diffs.length - 1][0] === DIFF_EQUAL) {
          patch.diffs[patch.diffs.length - 1][1] += postcontext;
        } else {
          patch.diffs.push([DIFF_EQUAL, postcontext]);
        }
      }
      if (!empty) {
        patches.splice(++x, 0, patch);
      }
    }
  }
};


/**
 * Take a list of patches and return a textual representation.
 * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of Patch objects.
 * @return {string} Text representation of patches.
 */
diff_match_patch.prototype.patch_toText = function(patches) {
  var text = [];
  for (var x = 0; x < patches.length; x++) {
    text[x] = patches[x];
  }
  return text.join('');
};


/**
 * Parse a textual representation of patches and return a list of Patch objects.
 * @param {string} textline Text representation of patches.
 * @return {!Array.<!diff_match_patch.patch_obj>} Array of Patch objects.
 * @throws {!Error} If invalid input.
 */
diff_match_patch.prototype.patch_fromText = function(textline) {
  var patches = [];
  if (!textline) {
    return patches;
  }
  var text = textline.split('\n');
  var textPointer = 0;
  var patchHeader = /^@@ -(\d+),?(\d*) \+(\d+),?(\d*) @@$/;
  while (textPointer < text.length) {
    var m = text[textPointer].match(patchHeader);
    if (!m) {
      throw new Error('Invalid patch string: ' + text[textPointer]);
    }
    var patch = new diff_match_patch.patch_obj();
    patches.push(patch);
    patch.start1 = parseInt(m[1], 10);
    if (m[2] === '') {
      patch.start1--;
      patch.length1 = 1;
    } else if (m[2] == '0') {
      patch.length1 = 0;
    } else {
      patch.start1--;
      patch.length1 = parseInt(m[2], 10);
    }

    patch.start2 = parseInt(m[3], 10);
    if (m[4] === '') {
      patch.start2--;
      patch.length2 = 1;
    } else if (m[4] == '0') {
      patch.length2 = 0;
    } else {
      patch.start2--;
      patch.length2 = parseInt(m[4], 10);
    }
    textPointer++;

    while (textPointer < text.length) {
      var sign = text[textPointer].charAt(0);
      try {
        var line = decodeURI(text[textPointer].substring(1));
      } catch (ex) {
        // Malformed URI sequence.
        throw new Error('Illegal escape in patch_fromText: ' + line);
      }
      if (sign == '-') {
        // Deletion.
        patch.diffs.push([DIFF_DELETE, line]);
      } else if (sign == '+') {
        // Insertion.
        patch.diffs.push([DIFF_INSERT, line]);
      } else if (sign == ' ') {
        // Minor equality.
        patch.diffs.push([DIFF_EQUAL, line]);
      } else if (sign == '@') {
        // Start of next patch.
        break;
      } else if (sign === '') {
        // Blank line?  Whatever.
      } else {
        // WTF?
        throw new Error('Invalid patch mode "' + sign + '" in: ' + line);
      }
      textPointer++;
    }
  }
  return patches;
};


/**
 * Class representing one patch operation.
 * @constructor
 */
diff_match_patch.patch_obj = function() {
  /** @type {!Array.<!diff_match_patch.Diff>} */
  this.diffs = [];
  /** @type {?number} */
  this.start1 = null;
  /** @type {?number} */
  this.start2 = null;
  /** @type {number} */
  this.length1 = 0;
  /** @type {number} */
  this.length2 = 0;
};


/**
 * Emmulate GNU diff's format.
 * Header: @@ -382,8 +481,9 @@
 * Indicies are printed as 1-based, not 0-based.
 * @return {string} The GNU diff string.
 */
diff_match_patch.patch_obj.prototype.toString = function() {
  var coords1, coords2;
  if (this.length1 === 0) {
    coords1 = this.start1 + ',0';
  } else if (this.length1 == 1) {
    coords1 = this.start1 + 1;
  } else {
    coords1 = (this.start1 + 1) + ',' + this.length1;
  }
  if (this.length2 === 0) {
    coords2 = this.start2 + ',0';
  } else if (this.length2 == 1) {
    coords2 = this.start2 + 1;
  } else {
    coords2 = (this.start2 + 1) + ',' + this.length2;
  }
  var text = ['@@ -' + coords1 + ' +' + coords2 + ' @@\n'];
  var op;
  // Escape the body of the patch with %xx notation.
  for (var x = 0; x < this.diffs.length; x++) {
    switch (this.diffs[x][0]) {
      case DIFF_INSERT:
        op = '+';
        break;
      case DIFF_DELETE:
        op = '-';
        break;
      case DIFF_EQUAL:
        op = ' ';
        break;
    }
    text[x + 1] = op + encodeURI(this.diffs[x][1]) + '\n';
  }
  return text.join('').replace(/%20/g, ' ');
};


// The following export code was added by @ForbesLindesay
module.exports = diff_match_patch;
module.exports['diff_match_patch'] = diff_match_patch;
module.exports['DIFF_DELETE'] = DIFF_DELETE;
module.exports['DIFF_INSERT'] = DIFF_INSERT;
module.exports['DIFF_EQUAL'] = DIFF_EQUAL;
});

/* global diff_match_patch */
var TEXT_DIFF = 2;
var DEFAULT_MIN_LENGTH = 60;
var cachedDiffPatch = null;

var getDiffMatchPatch = function getDiffMatchPatch(required) {
  /* jshint camelcase: false */

  if (!cachedDiffPatch) {
    var instance = void 0;
    /* eslint-disable camelcase, new-cap */
    if (typeof diff_match_patch !== 'undefined') {
      // already loaded, probably a browser
      instance = typeof diff_match_patch === 'function' ? new diff_match_patch() : new diff_match_patch.diff_match_patch();
    } else if (diffMatchPatch) {
      try {
        instance = diffMatchPatch && new diffMatchPatch();
      } catch (err) {
        instance = null;
      }
    }
    /* eslint-enable camelcase, new-cap */
    if (!instance) {
      if (!required) {
        return null;
      }
      var error = new Error('text diff_match_patch library not found');
      // eslint-disable-next-line camelcase
      error.diff_match_patch_not_found = true;
      throw error;
    }
    cachedDiffPatch = {
      diff: function diff(txt1, txt2) {
        return instance.patch_toText(instance.patch_make(txt1, txt2));
      },
      patch: function patch(txt1, _patch) {
        var results = instance.patch_apply(instance.patch_fromText(_patch), txt1);
        for (var i = 0; i < results[1].length; i++) {
          if (!results[1][i]) {
            var _error = new Error('text patch failed');
            _error.textPatchFailed = true;
          }
        }
        return results[0];
      }
    };
  }
  return cachedDiffPatch;
};

var diffFilter$3 = function textsDiffFilter(context) {
  if (context.leftType !== 'string') {
    return;
  }
  var minLength = context.options && context.options.textDiff && context.options.textDiff.minLength || DEFAULT_MIN_LENGTH;
  if (context.left.length < minLength || context.right.length < minLength) {
    context.setResult([context.left, context.right]).exit();
    return;
  }
  // large text, try to use a text-diff algorithm
  var diffMatchPatch$$1 = getDiffMatchPatch();
  if (!diffMatchPatch$$1) {
    // diff-match-patch library not available,
    // fallback to regular string replace
    context.setResult([context.left, context.right]).exit();
    return;
  }
  var diff = diffMatchPatch$$1.diff;
  context.setResult([diff(context.left, context.right), 0, TEXT_DIFF]).exit();
};
diffFilter$3.filterName = 'texts';

var patchFilter$3 = function textsPatchFilter(context) {
  if (context.nested) {
    return;
  }
  if (context.delta[2] !== TEXT_DIFF) {
    return;
  }

  // text-diff, use a text-patch algorithm
  var patch = getDiffMatchPatch(true).patch;
  context.setResult(patch(context.left, context.delta[0])).exit();
};
patchFilter$3.filterName = 'texts';

var textDeltaReverse = function textDeltaReverse(delta) {
  var i = void 0;
  var l = void 0;
  var lines = void 0;
  var line = void 0;
  var lineTmp = void 0;
  var header = null;
  var headerRegex = /^@@ +-(\d+),(\d+) +\+(\d+),(\d+) +@@$/;
  var lineHeader = void 0;
  lines = delta.split('\n');
  for (i = 0, l = lines.length; i < l; i++) {
    line = lines[i];
    var lineStart = line.slice(0, 1);
    if (lineStart === '@') {
      header = headerRegex.exec(line);
      lineHeader = i;

      // fix header
      lines[lineHeader] = '@@ -' + header[3] + ',' + header[4] + ' +' + header[1] + ',' + header[2] + ' @@';
    } else if (lineStart === '+') {
      lines[i] = '-' + lines[i].slice(1);
      if (lines[i - 1].slice(0, 1) === '+') {
        // swap lines to keep default order (-+)
        lineTmp = lines[i];
        lines[i] = lines[i - 1];
        lines[i - 1] = lineTmp;
      }
    } else if (lineStart === '-') {
      lines[i] = '+' + lines[i].slice(1);
    }
  }
  return lines.join('\n');
};

var reverseFilter$3 = function textsReverseFilter(context) {
  if (context.nested) {
    return;
  }
  if (context.delta[2] !== TEXT_DIFF) {
    return;
  }

  // text-diff, use a text-diff algorithm
  context.setResult([textDeltaReverse(context.delta[0]), 0, TEXT_DIFF]).exit();
};
reverseFilter$3.filterName = 'texts';

var DiffPatcher = function () {
  function DiffPatcher(options) {
    classCallCheck(this, DiffPatcher);

    this.processor = new Processor(options);
    this.processor.pipe(new Pipe('diff').append(collectChildrenDiffFilter, diffFilter, diffFilter$2, diffFilter$3, objectsDiffFilter, diffFilter$1).shouldHaveResult());
    this.processor.pipe(new Pipe('patch').append(collectChildrenPatchFilter, collectChildrenPatchFilter$1, patchFilter, patchFilter$3, patchFilter$1, patchFilter$2).shouldHaveResult());
    this.processor.pipe(new Pipe('reverse').append(collectChildrenReverseFilter, collectChildrenReverseFilter$1, reverseFilter, reverseFilter$3, reverseFilter$1, reverseFilter$2).shouldHaveResult());
  }

  createClass(DiffPatcher, [{
    key: 'options',
    value: function options() {
      var _processor;

      return (_processor = this.processor).options.apply(_processor, arguments);
    }
  }, {
    key: 'diff',
    value: function diff(left, right) {
      return this.processor.process(new DiffContext(left, right));
    }
  }, {
    key: 'patch',
    value: function patch(left, delta) {
      return this.processor.process(new PatchContext(left, delta));
    }
  }, {
    key: 'reverse',
    value: function reverse(delta) {
      return this.processor.process(new ReverseContext(delta));
    }
  }, {
    key: 'unpatch',
    value: function unpatch(right, delta) {
      return this.patch(right, this.reverse(delta));
    }
  }, {
    key: 'clone',
    value: function clone$$1(value) {
      return clone(value);
    }
  }]);
  return DiffPatcher;
}();

var isArray$3 = typeof Array.isArray === 'function' ? Array.isArray : function (a) {
  return a instanceof Array;
};

var getObjectKeys = typeof Object.keys === 'function' ? function (obj) {
  return Object.keys(obj);
} : function (obj) {
  var names = [];
  for (var property in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, property)) {
      names.push(property);
    }
  }
  return names;
};

var trimUnderscore = function trimUnderscore(str) {
  if (str.substr(0, 1) === '_') {
    return str.slice(1);
  }
  return str;
};

var arrayKeyToSortNumber = function arrayKeyToSortNumber(key) {
  if (key === '_t') {
    return -1;
  } else {
    if (key.substr(0, 1) === '_') {
      return parseInt(key.slice(1), 10);
    } else {
      return parseInt(key, 10) + 0.1;
    }
  }
};

var arrayKeyComparer = function arrayKeyComparer(key1, key2) {
  return arrayKeyToSortNumber(key1) - arrayKeyToSortNumber(key2);
};

var BaseFormatter = function () {
  function BaseFormatter() {
    classCallCheck(this, BaseFormatter);
  }

  createClass(BaseFormatter, [{
    key: 'format',
    value: function format(delta, left) {
      var context = {};
      this.prepareContext(context);
      this.recurse(context, delta, left);
      return this.finalize(context);
    }
  }, {
    key: 'prepareContext',
    value: function prepareContext(context) {
      context.buffer = [];
      context.out = function () {
        var _buffer;

        (_buffer = this.buffer).push.apply(_buffer, arguments);
      };
    }
  }, {
    key: 'typeFormattterNotFound',
    value: function typeFormattterNotFound(context, deltaType) {
      throw new Error('cannot format delta type: ' + deltaType);
    }
  }, {
    key: 'typeFormattterErrorFormatter',
    value: function typeFormattterErrorFormatter(context, err) {
      return err.toString();
    }
  }, {
    key: 'finalize',
    value: function finalize(_ref) {
      var buffer = _ref.buffer;

      if (isArray$3(buffer)) {
        return buffer.join('');
      }
    }
  }, {
    key: 'recurse',
    value: function recurse(context, delta, left, key, leftKey, movedFrom, isLast) {
      var useMoveOriginHere = delta && movedFrom;
      var leftValue = useMoveOriginHere ? movedFrom.value : left;

      if (typeof delta === 'undefined' && typeof key === 'undefined') {
        return undefined;
      }

      var type = this.getDeltaType(delta, movedFrom);
      var nodeType = type === 'node' ? delta._t === 'a' ? 'array' : 'object' : '';

      if (typeof key !== 'undefined') {
        this.nodeBegin(context, key, leftKey, type, nodeType, isLast);
      } else {
        this.rootBegin(context, type, nodeType);
      }

      var typeFormattter = void 0;
      try {
        typeFormattter = this['format_' + type] || this.typeFormattterNotFound(context, type);
        typeFormattter.call(this, context, delta, leftValue, key, leftKey, movedFrom);
      } catch (err) {
        this.typeFormattterErrorFormatter(context, err, delta, leftValue, key, leftKey, movedFrom);
        if (typeof console !== 'undefined' && console.error) {
          console.error(err.stack);
        }
      }

      if (typeof key !== 'undefined') {
        this.nodeEnd(context, key, leftKey, type, nodeType, isLast);
      } else {
        this.rootEnd(context, type, nodeType);
      }
    }
  }, {
    key: 'formatDeltaChildren',
    value: function formatDeltaChildren(context, delta, left) {
      var self = this;
      this.forEachDeltaKey(delta, left, function (key, leftKey, movedFrom, isLast) {
        self.recurse(context, delta[key], left ? left[leftKey] : undefined, key, leftKey, movedFrom, isLast);
      });
    }
  }, {
    key: 'forEachDeltaKey',
    value: function forEachDeltaKey(delta, left, fn) {
      var keys = getObjectKeys(delta);
      var arrayKeys = delta._t === 'a';
      var moveDestinations = {};
      var name = void 0;
      if (typeof left !== 'undefined') {
        for (name in left) {
          if (Object.prototype.hasOwnProperty.call(left, name)) {
            if (typeof delta[name] === 'undefined' && (!arrayKeys || typeof delta['_' + name] === 'undefined')) {
              keys.push(name);
            }
          }
        }
      }
      // look for move destinations
      for (name in delta) {
        if (Object.prototype.hasOwnProperty.call(delta, name)) {
          var value = delta[name];
          if (isArray$3(value) && value[2] === 3) {
            moveDestinations[value[1].toString()] = {
              key: name,
              value: left && left[parseInt(name.substr(1))]
            };
            if (this.includeMoveDestinations !== false) {
              if (typeof left === 'undefined' && typeof delta[value[1]] === 'undefined') {
                keys.push(value[1].toString());
              }
            }
          }
        }
      }
      if (arrayKeys) {
        keys.sort(arrayKeyComparer);
      } else {
        keys.sort();
      }
      for (var index = 0, length = keys.length; index < length; index++) {
        var key = keys[index];
        if (arrayKeys && key === '_t') {
          continue;
        }
        var leftKey = arrayKeys ? typeof key === 'number' ? key : parseInt(trimUnderscore(key), 10) : key;
        var isLast = index === length - 1;
        fn(key, leftKey, moveDestinations[leftKey], isLast);
      }
    }
  }, {
    key: 'getDeltaType',
    value: function getDeltaType(delta, movedFrom) {
      if (typeof delta === 'undefined') {
        if (typeof movedFrom !== 'undefined') {
          return 'movedestination';
        }
        return 'unchanged';
      }
      if (isArray$3(delta)) {
        if (delta.length === 1) {
          return 'added';
        }
        if (delta.length === 2) {
          return 'modified';
        }
        if (delta.length === 3 && delta[2] === 0) {
          return 'deleted';
        }
        if (delta.length === 3 && delta[2] === 2) {
          return 'textdiff';
        }
        if (delta.length === 3 && delta[2] === 3) {
          return 'moved';
        }
      } else if ((typeof delta === 'undefined' ? 'undefined' : _typeof(delta)) === 'object') {
        return 'node';
      }
      return 'unknown';
    }
  }, {
    key: 'parseTextDiff',
    value: function parseTextDiff(value) {
      var output = [];
      var lines = value.split('\n@@ ');
      for (var i = 0, l = lines.length; i < l; i++) {
        var line = lines[i];
        var lineOutput = {
          pieces: []
        };
        var location = /^(?:@@ )?[-+]?(\d+),(\d+)/.exec(line).slice(1);
        lineOutput.location = {
          line: location[0],
          chr: location[1]
        };
        var pieces = line.split('\n').slice(1);
        for (var pieceIndex = 0, piecesLength = pieces.length; pieceIndex < piecesLength; pieceIndex++) {
          var piece = pieces[pieceIndex];
          if (!piece.length) {
            continue;
          }
          var pieceOutput = {
            type: 'context'
          };
          if (piece.substr(0, 1) === '+') {
            pieceOutput.type = 'added';
          } else if (piece.substr(0, 1) === '-') {
            pieceOutput.type = 'deleted';
          }
          pieceOutput.text = piece.slice(1);
          lineOutput.pieces.push(pieceOutput);
        }
        output.push(lineOutput);
      }
      return output;
    }
  }]);
  return BaseFormatter;
}();



var base = Object.freeze({
	default: BaseFormatter
});

var HtmlFormatter = function (_BaseFormatter) {
  inherits(HtmlFormatter, _BaseFormatter);

  function HtmlFormatter() {
    classCallCheck(this, HtmlFormatter);
    return possibleConstructorReturn(this, (HtmlFormatter.__proto__ || Object.getPrototypeOf(HtmlFormatter)).apply(this, arguments));
  }

  createClass(HtmlFormatter, [{
    key: 'typeFormattterErrorFormatter',
    value: function typeFormattterErrorFormatter(context, err) {
      context.out('<pre class="jsondiffpatch-error">' + err + '</pre>');
    }
  }, {
    key: 'formatValue',
    value: function formatValue(context, value) {
      context.out('<pre>' + htmlEscape(JSON.stringify(value, null, 2)) + '</pre>');
    }
  }, {
    key: 'formatTextDiffString',
    value: function formatTextDiffString(context, value) {
      var lines = this.parseTextDiff(value);
      context.out('<ul class="jsondiffpatch-textdiff">');
      for (var i = 0, l = lines.length; i < l; i++) {
        var line = lines[i];
        context.out('<li><div class="jsondiffpatch-textdiff-location">' + ('<span class="jsondiffpatch-textdiff-line-number">' + line.location.line + '</span><span class="jsondiffpatch-textdiff-char">' + line.location.chr + '</span></div><div class="jsondiffpatch-textdiff-line">'));
        var pieces = line.pieces;
        for (var pieceIndex = 0, piecesLength = pieces.length; pieceIndex < piecesLength; pieceIndex++) {
          /* global decodeURI */
          var piece = pieces[pieceIndex];
          context.out('<span class="jsondiffpatch-textdiff-' + piece.type + '">' + htmlEscape(decodeURI(piece.text)) + '</span>');
        }
        context.out('</div></li>');
      }
      context.out('</ul>');
    }
  }, {
    key: 'rootBegin',
    value: function rootBegin(context, type, nodeType) {
      var nodeClass = 'jsondiffpatch-' + type + (nodeType ? ' jsondiffpatch-child-node-type-' + nodeType : '');
      context.out('<div class="jsondiffpatch-delta ' + nodeClass + '">');
    }
  }, {
    key: 'rootEnd',
    value: function rootEnd(context) {
      context.out('</div>' + (context.hasArrows ? '<script type="text/javascript">setTimeout(' + (adjustArrows.toString() + ',10);</script>') : ''));
    }
  }, {
    key: 'nodeBegin',
    value: function nodeBegin(context, key, leftKey, type, nodeType) {
      var nodeClass = 'jsondiffpatch-' + type + (nodeType ? ' jsondiffpatch-child-node-type-' + nodeType : '');
      context.out('<li class="' + nodeClass + '" data-key="' + leftKey + '">' + ('<div class="jsondiffpatch-property-name">' + leftKey + '</div>'));
    }
  }, {
    key: 'nodeEnd',
    value: function nodeEnd(context) {
      context.out('</li>');
    }

    /* jshint camelcase: false */
    /* eslint-disable camelcase */

  }, {
    key: 'format_unchanged',
    value: function format_unchanged(context, delta, left) {
      if (typeof left === 'undefined') {
        return;
      }
      context.out('<div class="jsondiffpatch-value">');
      this.formatValue(context, left);
      context.out('</div>');
    }
  }, {
    key: 'format_movedestination',
    value: function format_movedestination(context, delta, left) {
      if (typeof left === 'undefined') {
        return;
      }
      context.out('<div class="jsondiffpatch-value">');
      this.formatValue(context, left);
      context.out('</div>');
    }
  }, {
    key: 'format_node',
    value: function format_node(context, delta, left) {
      // recurse
      var nodeType = delta._t === 'a' ? 'array' : 'object';
      context.out('<ul class="jsondiffpatch-node jsondiffpatch-node-type-' + nodeType + '">');
      this.formatDeltaChildren(context, delta, left);
      context.out('</ul>');
    }
  }, {
    key: 'format_added',
    value: function format_added(context, delta) {
      context.out('<div class="jsondiffpatch-value">');
      this.formatValue(context, delta[0]);
      context.out('</div>');
    }
  }, {
    key: 'format_modified',
    value: function format_modified(context, delta) {
      context.out('<div class="jsondiffpatch-value jsondiffpatch-left-value">');
      this.formatValue(context, delta[0]);
      context.out('</div>' + '<div class="jsondiffpatch-value jsondiffpatch-right-value">');
      this.formatValue(context, delta[1]);
      context.out('</div>');
    }
  }, {
    key: 'format_deleted',
    value: function format_deleted(context, delta) {
      context.out('<div class="jsondiffpatch-value">');
      this.formatValue(context, delta[0]);
      context.out('</div>');
    }
  }, {
    key: 'format_moved',
    value: function format_moved(context, delta) {
      context.out('<div class="jsondiffpatch-value">');
      this.formatValue(context, delta[0]);
      context.out('</div><div class="jsondiffpatch-moved-destination">' + delta[1] + '</div>');

      // draw an SVG arrow from here to move destination
      context.out(
      /* jshint multistr: true */
      '<div class="jsondiffpatch-arrow" ' + 'style="position: relative; left: -34px;">\n          <svg width="30" height="60" ' + 'style="position: absolute; display: none;">\n          <defs>\n              <marker id="markerArrow" markerWidth="8" markerHeight="8"\n                 refx="2" refy="4"\n                     orient="auto" markerUnits="userSpaceOnUse">\n                  <path d="M1,1 L1,7 L7,4 L1,1" style="fill: #339;" />\n              </marker>\n          </defs>\n          <path d="M30,0 Q-10,25 26,50"\n            style="stroke: #88f; stroke-width: 2px; fill: none; ' + 'stroke-opacity: 0.5; marker-end: url(#markerArrow);"\n          ></path>\n          </svg>\n      </div>');
      context.hasArrows = true;
    }
  }, {
    key: 'format_textdiff',
    value: function format_textdiff(context, delta) {
      context.out('<div class="jsondiffpatch-value">');
      this.formatTextDiffString(context, delta[0]);
      context.out('</div>');
    }
  }]);
  return HtmlFormatter;
}(BaseFormatter);

function htmlEscape(text) {
  var html = text;
  var replacements = [[/&/g, '&amp;'], [/</g, '&lt;'], [/>/g, '&gt;'], [/'/g, '&apos;'], [/"/g, '&quot;']];
  for (var i = 0; i < replacements.length; i++) {
    html = html.replace(replacements[i][0], replacements[i][1]);
  }
  return html;
}

var adjustArrows = function jsondiffpatchHtmlFormatterAdjustArrows(nodeArg) {
  var node = nodeArg || document;
  var getElementText = function getElementText(_ref) {
    var textContent = _ref.textContent,
        innerText = _ref.innerText;
    return textContent || innerText;
  };
  var eachByQuery = function eachByQuery(el, query, fn) {
    var elems = el.querySelectorAll(query);
    for (var i = 0, l = elems.length; i < l; i++) {
      fn(elems[i]);
    }
  };
  var eachChildren = function eachChildren(_ref2, fn) {
    var children = _ref2.children;

    for (var i = 0, l = children.length; i < l; i++) {
      fn(children[i], i);
    }
  };
  eachByQuery(node, '.jsondiffpatch-arrow', function (_ref3) {
    var parentNode = _ref3.parentNode,
        children = _ref3.children,
        style = _ref3.style;

    var arrowParent = parentNode;
    var svg = children[0];
    var path = svg.children[1];
    svg.style.display = 'none';
    var destination = getElementText(arrowParent.querySelector('.jsondiffpatch-moved-destination'));
    var container = arrowParent.parentNode;
    var destinationElem = void 0;
    eachChildren(container, function (child) {
      if (child.getAttribute('data-key') === destination) {
        destinationElem = child;
      }
    });
    if (!destinationElem) {
      return;
    }
    try {
      var distance = destinationElem.offsetTop - arrowParent.offsetTop;
      svg.setAttribute('height', Math.abs(distance) + 6);
      style.top = -8 + (distance > 0 ? 0 : distance) + 'px';
      var curve = distance > 0 ? 'M30,0 Q-10,' + Math.round(distance / 2) + ' 26,' + (distance - 4) : 'M30,' + -distance + ' Q-10,' + Math.round(-distance / 2) + ' 26,4';
      path.setAttribute('d', curve);
      svg.style.display = '';
    } catch (err) {}
  });
};

/* jshint camelcase: true */
/* eslint-enable camelcase */

var showUnchanged = function showUnchanged(show, node, delay) {
  var el = node || document.body;
  var prefix = 'jsondiffpatch-unchanged-';
  var classes = {
    showing: prefix + 'showing',
    hiding: prefix + 'hiding',
    visible: prefix + 'visible',
    hidden: prefix + 'hidden'
  };
  var list = el.classList;
  if (!list) {
    return;
  }
  if (!delay) {
    list.remove(classes.showing);
    list.remove(classes.hiding);
    list.remove(classes.visible);
    list.remove(classes.hidden);
    if (show === false) {
      list.add(classes.hidden);
    }
    return;
  }
  if (show === false) {
    list.remove(classes.showing);
    list.add(classes.visible);
    setTimeout(function () {
      list.add(classes.hiding);
    }, 10);
  } else {
    list.remove(classes.hiding);
    list.add(classes.showing);
    list.remove(classes.hidden);
  }
  var intervalId = setInterval(function () {
    adjustArrows(el);
  }, 100);
  setTimeout(function () {
    list.remove(classes.showing);
    list.remove(classes.hiding);
    if (show === false) {
      list.add(classes.hidden);
      list.remove(classes.visible);
    } else {
      list.add(classes.visible);
      list.remove(classes.hidden);
    }
    setTimeout(function () {
      list.remove(classes.visible);
      clearInterval(intervalId);
    }, delay + 400);
  }, delay);
};

var hideUnchanged = function hideUnchanged(node, delay) {
  return showUnchanged(false, node, delay);
};

var defaultInstance = void 0;

function format(delta, left) {
  if (!defaultInstance) {
    defaultInstance = new HtmlFormatter();
  }
  return defaultInstance.format(delta, left);
}



var html = Object.freeze({
	showUnchanged: showUnchanged,
	hideUnchanged: hideUnchanged,
	default: HtmlFormatter,
	format: format
});

var AnnotatedFormatter = function (_BaseFormatter) {
  inherits(AnnotatedFormatter, _BaseFormatter);

  function AnnotatedFormatter() {
    classCallCheck(this, AnnotatedFormatter);

    var _this = possibleConstructorReturn(this, (AnnotatedFormatter.__proto__ || Object.getPrototypeOf(AnnotatedFormatter)).call(this));

    _this.includeMoveDestinations = false;
    return _this;
  }

  createClass(AnnotatedFormatter, [{
    key: 'prepareContext',
    value: function prepareContext(context) {
      get(AnnotatedFormatter.prototype.__proto__ || Object.getPrototypeOf(AnnotatedFormatter.prototype), 'prepareContext', this).call(this, context);
      context.indent = function (levels) {
        this.indentLevel = (this.indentLevel || 0) + (typeof levels === 'undefined' ? 1 : levels);
        this.indentPad = new Array(this.indentLevel + 1).join('&nbsp;&nbsp;');
      };
      context.row = function (json, htmlNote) {
        context.out('<tr><td style="white-space: nowrap;">' + '<pre class="jsondiffpatch-annotated-indent"' + ' style="display: inline-block">');
        context.out(context.indentPad);
        context.out('</pre><pre style="display: inline-block">');
        context.out(json);
        context.out('</pre></td><td class="jsondiffpatch-delta-note"><div>');
        context.out(htmlNote);
        context.out('</div></td></tr>');
      };
    }
  }, {
    key: 'typeFormattterErrorFormatter',
    value: function typeFormattterErrorFormatter(context, err) {
      context.row('', '<pre class="jsondiffpatch-error">' + err + '</pre>');
    }
  }, {
    key: 'formatTextDiffString',
    value: function formatTextDiffString(context, value) {
      var lines = this.parseTextDiff(value);
      context.out('<ul class="jsondiffpatch-textdiff">');
      for (var i = 0, l = lines.length; i < l; i++) {
        var line = lines[i];
        context.out('<li><div class="jsondiffpatch-textdiff-location">' + ('<span class="jsondiffpatch-textdiff-line-number">' + line.location.line + '</span><span class="jsondiffpatch-textdiff-char">' + line.location.chr + '</span></div><div class="jsondiffpatch-textdiff-line">'));
        var pieces = line.pieces;
        for (var pieceIndex = 0, piecesLength = pieces.length; pieceIndex < piecesLength; pieceIndex++) {
          var piece = pieces[pieceIndex];
          context.out('<span class="jsondiffpatch-textdiff-' + piece.type + '">' + piece.text + '</span>');
        }
        context.out('</div></li>');
      }
      context.out('</ul>');
    }
  }, {
    key: 'rootBegin',
    value: function rootBegin(context, type, nodeType) {
      context.out('<table class="jsondiffpatch-annotated-delta">');
      if (type === 'node') {
        context.row('{');
        context.indent();
      }
      if (nodeType === 'array') {
        context.row('"_t": "a",', 'Array delta (member names indicate array indices)');
      }
    }
  }, {
    key: 'rootEnd',
    value: function rootEnd(context, type) {
      if (type === 'node') {
        context.indent(-1);
        context.row('}');
      }
      context.out('</table>');
    }
  }, {
    key: 'nodeBegin',
    value: function nodeBegin(context, key, leftKey, type, nodeType) {
      context.row('&quot;' + key + '&quot;: {');
      if (type === 'node') {
        context.indent();
      }
      if (nodeType === 'array') {
        context.row('"_t": "a",', 'Array delta (member names indicate array indices)');
      }
    }
  }, {
    key: 'nodeEnd',
    value: function nodeEnd(context, key, leftKey, type, nodeType, isLast) {
      if (type === 'node') {
        context.indent(-1);
      }
      context.row('}' + (isLast ? '' : ','));
    }

    /* jshint camelcase: false */

    /* eslint-disable camelcase */

  }, {
    key: 'format_unchanged',
    value: function format_unchanged() {}
  }, {
    key: 'format_movedestination',
    value: function format_movedestination() {}
  }, {
    key: 'format_node',
    value: function format_node(context, delta, left) {
      // recurse
      this.formatDeltaChildren(context, delta, left);
    }
  }]);
  return AnnotatedFormatter;
}(BaseFormatter);

/* eslint-enable camelcase */

var wrapPropertyName = function wrapPropertyName(name) {
  return '<pre style="display:inline-block">&quot;' + name + '&quot;</pre>';
};

var deltaAnnotations = {
  added: function added(delta, left, key, leftKey) {
    var formatLegend = ' <pre>([newValue])</pre>';
    if (typeof leftKey === 'undefined') {
      return 'new value' + formatLegend;
    }
    if (typeof leftKey === 'number') {
      return 'insert at index ' + leftKey + formatLegend;
    }
    return 'add property ' + wrapPropertyName(leftKey) + formatLegend;
  },
  modified: function modified(delta, left, key, leftKey) {
    var formatLegend = ' <pre>([previousValue, newValue])</pre>';
    if (typeof leftKey === 'undefined') {
      return 'modify value' + formatLegend;
    }
    if (typeof leftKey === 'number') {
      return 'modify at index ' + leftKey + formatLegend;
    }
    return 'modify property ' + wrapPropertyName(leftKey) + formatLegend;
  },
  deleted: function deleted(delta, left, key, leftKey) {
    var formatLegend = ' <pre>([previousValue, 0, 0])</pre>';
    if (typeof leftKey === 'undefined') {
      return 'delete value' + formatLegend;
    }
    if (typeof leftKey === 'number') {
      return 'remove index ' + leftKey + formatLegend;
    }
    return 'delete property ' + wrapPropertyName(leftKey) + formatLegend;
  },
  moved: function moved(delta, left, key, leftKey) {
    return 'move from <span title="(position to remove at original state)">' + ('index ' + leftKey + '</span> to <span title="(position to insert at final') + (' state)">index ' + delta[1] + '</span>');
  },
  textdiff: function textdiff(delta, left, key, leftKey) {
    var location = typeof leftKey === 'undefined' ? '' : typeof leftKey === 'number' ? ' at index ' + leftKey : ' at property ' + wrapPropertyName(leftKey);
    return 'text diff' + location + ', format is <a href="https://code.google.com/' + 'p/google-diff-match-patch/wiki/Unidiff">a variation of Unidiff</a>';
  }
};

var formatAnyChange = function formatAnyChange(context, delta) {
  var deltaType = this.getDeltaType(delta);
  var annotator = deltaAnnotations[deltaType];
  var htmlNote = annotator && annotator.apply(annotator, Array.prototype.slice.call(arguments, 1));
  var json = JSON.stringify(delta, null, 2);
  if (deltaType === 'textdiff') {
    // split text diffs lines
    json = json.split('\\n').join('\\n"+\n   "');
  }
  context.indent();
  context.row(json, htmlNote);
  context.indent(-1);
};

/* eslint-disable camelcase */
AnnotatedFormatter.prototype.format_added = formatAnyChange;
AnnotatedFormatter.prototype.format_modified = formatAnyChange;
AnnotatedFormatter.prototype.format_deleted = formatAnyChange;
AnnotatedFormatter.prototype.format_moved = formatAnyChange;
AnnotatedFormatter.prototype.format_textdiff = formatAnyChange;
var defaultInstance$1 = void 0;

function format$1(delta, left) {
  if (!defaultInstance$1) {
    defaultInstance$1 = new AnnotatedFormatter();
  }
  return defaultInstance$1.format(delta, left);
}



var annotated = Object.freeze({
	default: AnnotatedFormatter,
	format: format$1
});

var OPERATIONS = {
  add: 'add',
  remove: 'remove',
  replace: 'replace',
  move: 'move'
};

var JSONFormatter = function (_BaseFormatter) {
  inherits(JSONFormatter, _BaseFormatter);

  function JSONFormatter() {
    classCallCheck(this, JSONFormatter);

    var _this = possibleConstructorReturn(this, (JSONFormatter.__proto__ || Object.getPrototypeOf(JSONFormatter)).call(this));

    _this.includeMoveDestinations = true;
    return _this;
  }

  createClass(JSONFormatter, [{
    key: 'prepareContext',
    value: function prepareContext(context) {
      get(JSONFormatter.prototype.__proto__ || Object.getPrototypeOf(JSONFormatter.prototype), 'prepareContext', this).call(this, context);
      context.result = [];
      context.path = [];
      context.pushCurrentOp = function (obj) {
        var op = obj.op,
            value = obj.value;

        var val = {
          op: op,
          path: this.currentPath()
        };
        if (typeof value !== 'undefined') {
          val.value = value;
        }
        this.result.push(val);
      };

      context.pushMoveOp = function (to) {
        var from = this.currentPath();
        this.result.push({
          op: OPERATIONS.move,
          from: from,
          path: this.toPath(to)
        });
      };

      context.currentPath = function () {
        return '/' + this.path.join('/');
      };

      context.toPath = function (toPath) {
        var to = this.path.slice();
        to[to.length - 1] = toPath;
        return '/' + to.join('/');
      };
    }
  }, {
    key: 'typeFormattterErrorFormatter',
    value: function typeFormattterErrorFormatter(context, err) {
      context.out('[ERROR] ' + err);
    }
  }, {
    key: 'rootBegin',
    value: function rootBegin() {}
  }, {
    key: 'rootEnd',
    value: function rootEnd() {}
  }, {
    key: 'nodeBegin',
    value: function nodeBegin(_ref, key, leftKey) {
      var path = _ref.path;

      path.push(leftKey);
    }
  }, {
    key: 'nodeEnd',
    value: function nodeEnd(_ref2) {
      var path = _ref2.path;

      path.pop();
    }

    /* jshint camelcase: false */
    /* eslint-disable camelcase */

  }, {
    key: 'format_unchanged',
    value: function format_unchanged() {}
  }, {
    key: 'format_movedestination',
    value: function format_movedestination() {}
  }, {
    key: 'format_node',
    value: function format_node(context, delta, left) {
      this.formatDeltaChildren(context, delta, left);
    }
  }, {
    key: 'format_added',
    value: function format_added(context, delta) {
      context.pushCurrentOp({ op: OPERATIONS.add, value: delta[0] });
    }
  }, {
    key: 'format_modified',
    value: function format_modified(context, delta) {
      context.pushCurrentOp({ op: OPERATIONS.replace, value: delta[1] });
    }
  }, {
    key: 'format_deleted',
    value: function format_deleted(context) {
      context.pushCurrentOp({ op: OPERATIONS.remove });
    }
  }, {
    key: 'format_moved',
    value: function format_moved(context, delta) {
      var to = delta[1];
      context.pushMoveOp(to);
    }
  }, {
    key: 'format_textdiff',
    value: function format_textdiff() {
      throw new Error('Not implemented');
    }
  }, {
    key: 'format',
    value: function format(delta, left) {
      var context = {};
      this.prepareContext(context);
      this.recurse(context, delta, left);
      return context.result;
    }
  }]);
  return JSONFormatter;
}(BaseFormatter);

var last = function last(arr) {
  return arr[arr.length - 1];
};

var sortBy = function sortBy(arr, pred) {
  arr.sort(pred);
  return arr;
};

var compareByIndexDesc = function compareByIndexDesc(indexA, indexB) {
  var lastA = parseInt(indexA, 10);
  var lastB = parseInt(indexB, 10);
  if (!(isNaN(lastA) || isNaN(lastB))) {
    return lastB - lastA;
  } else {
    return 0;
  }
};

var opsByDescendingOrder = function opsByDescendingOrder(removeOps) {
  return sortBy(removeOps, function (a, b) {
    var splitA = a.path.split('/');
    var splitB = b.path.split('/');
    if (splitA.length !== splitB.length) {
      return splitA.length - splitB.length;
    } else {
      return compareByIndexDesc(last(splitA), last(splitB));
    }
  });
};

var partitionOps = function partitionOps(arr, fns) {
  var initArr = Array(fns.length + 1).fill().map(function () {
    return [];
  });
  return arr.map(function (item) {
    var position = fns.map(function (fn) {
      return fn(item);
    }).indexOf(true);
    if (position < 0) {
      position = fns.length;
    }
    return { item: item, position: position };
  }).reduce(function (acc, item) {
    acc[item.position].push(item.item);
    return acc;
  }, initArr);
};
var isMoveOp = function isMoveOp(_ref3) {
  var op = _ref3.op;
  return op === 'move';
};
var isRemoveOp = function isRemoveOp(_ref4) {
  var op = _ref4.op;
  return op === 'remove';
};

var reorderOps = function reorderOps(diff) {
  var _partitionOps = partitionOps(diff, [isMoveOp, isRemoveOp]),
      _partitionOps2 = slicedToArray(_partitionOps, 3),
      moveOps = _partitionOps2[0],
      removedOps = _partitionOps2[1],
      restOps = _partitionOps2[2];

  var removeOpsReverse = opsByDescendingOrder(removedOps);
  return [].concat(toConsumableArray(removeOpsReverse), toConsumableArray(moveOps), toConsumableArray(restOps));
};

var defaultInstance$2 = void 0;

var format$2 = function format(delta, left) {
  if (!defaultInstance$2) {
    defaultInstance$2 = new JSONFormatter();
  }
  return reorderOps(defaultInstance$2.format(delta, left));
};

var log = function log(delta, left) {
  console.log(format$2(delta, left));
};



var jsonpatch = Object.freeze({
	default: JSONFormatter,
	partitionOps: partitionOps,
	format: format$2,
	log: log
});

function chalkColor(name) {
  return chalk && chalk[name] || function () {
    for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    return args;
  };
}

var colors = {
  added: chalkColor('green'),
  deleted: chalkColor('red'),
  movedestination: chalkColor('gray'),
  moved: chalkColor('yellow'),
  unchanged: chalkColor('gray'),
  error: chalkColor('white.bgRed'),
  textDiffLine: chalkColor('gray')
};

var ConsoleFormatter = function (_BaseFormatter) {
  inherits(ConsoleFormatter, _BaseFormatter);

  function ConsoleFormatter() {
    classCallCheck(this, ConsoleFormatter);

    var _this = possibleConstructorReturn(this, (ConsoleFormatter.__proto__ || Object.getPrototypeOf(ConsoleFormatter)).call(this));

    _this.includeMoveDestinations = false;
    return _this;
  }

  createClass(ConsoleFormatter, [{
    key: 'prepareContext',
    value: function prepareContext(context) {
      get(ConsoleFormatter.prototype.__proto__ || Object.getPrototypeOf(ConsoleFormatter.prototype), 'prepareContext', this).call(this, context);
      context.indent = function (levels) {
        this.indentLevel = (this.indentLevel || 0) + (typeof levels === 'undefined' ? 1 : levels);
        this.indentPad = new Array(this.indentLevel + 1).join('  ');
        this.outLine();
      };
      context.outLine = function () {
        this.buffer.push('\n' + (this.indentPad || ''));
      };
      context.out = function () {
        for (var _len2 = arguments.length, args = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
          args[_key2] = arguments[_key2];
        }

        for (var i = 0, l = args.length; i < l; i++) {
          var lines = args[i].split('\n');
          var text = lines.join('\n' + (this.indentPad || ''));
          if (this.color && this.color[0]) {
            text = this.color[0](text);
          }
          this.buffer.push(text);
        }
      };
      context.pushColor = function (color) {
        this.color = this.color || [];
        this.color.unshift(color);
      };
      context.popColor = function () {
        this.color = this.color || [];
        this.color.shift();
      };
    }
  }, {
    key: 'typeFormattterErrorFormatter',
    value: function typeFormattterErrorFormatter(context, err) {
      context.pushColor(colors.error);
      context.out('[ERROR]' + err);
      context.popColor();
    }
  }, {
    key: 'formatValue',
    value: function formatValue(context, value) {
      context.out(JSON.stringify(value, null, 2));
    }
  }, {
    key: 'formatTextDiffString',
    value: function formatTextDiffString(context, value) {
      var lines = this.parseTextDiff(value);
      context.indent();
      for (var i = 0, l = lines.length; i < l; i++) {
        var line = lines[i];
        context.pushColor(colors.textDiffLine);
        context.out(line.location.line + ',' + line.location.chr + ' ');
        context.popColor();
        var pieces = line.pieces;
        for (var pieceIndex = 0, piecesLength = pieces.length; pieceIndex < piecesLength; pieceIndex++) {
          var piece = pieces[pieceIndex];
          context.pushColor(colors[piece.type]);
          context.out(piece.text);
          context.popColor();
        }
        if (i < l - 1) {
          context.outLine();
        }
      }
      context.indent(-1);
    }
  }, {
    key: 'rootBegin',
    value: function rootBegin(context, type, nodeType) {
      context.pushColor(colors[type]);
      if (type === 'node') {
        context.out(nodeType === 'array' ? '[' : '{');
        context.indent();
      }
    }
  }, {
    key: 'rootEnd',
    value: function rootEnd(context, type, nodeType) {
      if (type === 'node') {
        context.indent(-1);
        context.out(nodeType === 'array' ? ']' : '}');
      }
      context.popColor();
    }
  }, {
    key: 'nodeBegin',
    value: function nodeBegin(context, key, leftKey, type, nodeType) {
      context.pushColor(colors[type]);
      context.out(leftKey + ': ');
      if (type === 'node') {
        context.out(nodeType === 'array' ? '[' : '{');
        context.indent();
      }
    }
  }, {
    key: 'nodeEnd',
    value: function nodeEnd(context, key, leftKey, type, nodeType, isLast) {
      if (type === 'node') {
        context.indent(-1);
        context.out(nodeType === 'array' ? ']' : '}' + (isLast ? '' : ','));
      }
      if (!isLast) {
        context.outLine();
      }
      context.popColor();
    }

    /* jshint camelcase: false */
    /* eslint-disable camelcase */

  }, {
    key: 'format_unchanged',
    value: function format_unchanged(context, delta, left) {
      if (typeof left === 'undefined') {
        return;
      }
      this.formatValue(context, left);
    }
  }, {
    key: 'format_movedestination',
    value: function format_movedestination(context, delta, left) {
      if (typeof left === 'undefined') {
        return;
      }
      this.formatValue(context, left);
    }
  }, {
    key: 'format_node',
    value: function format_node(context, delta, left) {
      // recurse
      this.formatDeltaChildren(context, delta, left);
    }
  }, {
    key: 'format_added',
    value: function format_added(context, delta) {
      this.formatValue(context, delta[0]);
    }
  }, {
    key: 'format_modified',
    value: function format_modified(context, delta) {
      context.pushColor(colors.deleted);
      this.formatValue(context, delta[0]);
      context.popColor();
      context.out(' => ');
      context.pushColor(colors.added);
      this.formatValue(context, delta[1]);
      context.popColor();
    }
  }, {
    key: 'format_deleted',
    value: function format_deleted(context, delta) {
      this.formatValue(context, delta[0]);
    }
  }, {
    key: 'format_moved',
    value: function format_moved(context, delta) {
      context.out('==> ' + delta[1]);
    }
  }, {
    key: 'format_textdiff',
    value: function format_textdiff(context, delta) {
      this.formatTextDiffString(context, delta[0]);
    }
  }]);
  return ConsoleFormatter;
}(BaseFormatter);

var defaultInstance$3 = void 0;

var format$3 = function format(delta, left) {
  if (!defaultInstance$3) {
    defaultInstance$3 = new ConsoleFormatter();
  }
  return defaultInstance$3.format(delta, left);
};

function log$1(delta, left) {
  console.log(format$3(delta, left));
}



var console$1 = Object.freeze({
	default: ConsoleFormatter,
	format: format$3,
	log: log$1
});



var index = Object.freeze({
	base: base,
	html: html,
	annotated: annotated,
	jsonpatch: jsonpatch,
	console: console$1
});

// use as 2nd parameter for JSON.parse to revive Date instances
function dateReviver(key, value) {
  var parts = void 0;
  if (typeof value === 'string') {
    // eslint-disable-next-line max-len
    parts = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d*))?(Z|([+-])(\d{2}):(\d{2}))$/.exec(value);
    if (parts) {
      return new Date(Date.UTC(+parts[1], +parts[2] - 1, +parts[3], +parts[4], +parts[5], +parts[6], +(parts[7] || 0)));
    }
  }
  return value;
}

function create(options) {
  return new DiffPatcher(options);
}

var defaultInstance$4 = void 0;

function diff() {
  if (!defaultInstance$4) {
    defaultInstance$4 = new DiffPatcher();
  }
  return defaultInstance$4.diff.apply(defaultInstance$4, arguments);
}

function patch() {
  if (!defaultInstance$4) {
    defaultInstance$4 = new DiffPatcher();
  }
  return defaultInstance$4.patch.apply(defaultInstance$4, arguments);
}

function unpatch() {
  if (!defaultInstance$4) {
    defaultInstance$4 = new DiffPatcher();
  }
  return defaultInstance$4.unpatch.apply(defaultInstance$4, arguments);
}

function reverse() {
  if (!defaultInstance$4) {
    defaultInstance$4 = new DiffPatcher();
  }
  return defaultInstance$4.reverse.apply(defaultInstance$4, arguments);
}

function clone$1() {
  if (!defaultInstance$4) {
    defaultInstance$4 = new DiffPatcher();
  }
  return defaultInstance$4.clone.apply(defaultInstance$4, arguments);
}

exports.DiffPatcher = DiffPatcher;
exports.formatters = index;
exports.console = console$1;
exports.create = create;
exports.dateReviver = dateReviver;
exports.diff = diff;
exports.patch = patch;
exports.unpatch = unpatch;
exports.reverse = reverse;
exports.clone = clone$1;

Object.defineProperty(exports, '__esModule', { value: true });

})));
