text: /**
   * Super simple wysiwyg editor v0.8.1
   * http://summernote.org/
   *
   * summernote.js
   * Copyright 2013-2015 Alan Hong. and other contributors
   * summernote may be freely distributed under the MIT license./
   *
   * Date: 2016-02-15T18:35Z
   */
  (function (factory) {
    /* global define */
    if (typeof define === 'function' && define.amd) {
      // AMD. Register as an anonymous module.
      define(['jquery'], factory);
    } else if (typeof module === 'object' && module.exports) {
      // Node/CommonJS
      module.exports = factory(require('jquery'));
    } else {
      // Browser globals
      factory(window.jQuery);
    }
  }(function ($) {
    'use strict';
  
    /**
     * @class core.func
     *
     * func utils (for high-order func's arg)
     *
     * @singleton
     * @alternateClassName func
     */
    var func = (function () {
      var eq = function (itemA) {
        return function (itemB) {
          return itemA === itemB;
        };
      };
  
      var eq2 = function (itemA, itemB) {
        return itemA === itemB;
      };
  
      var peq2 = function (propName) {
        return function (itemA, itemB) {
          return itemA[propName] === itemB[propName];
        };
      };
  
      var ok = function () {
        return true;
      };
  
      var fail = function () {
        return false;
      };
  
      var not = function (f) {
        return function () {
          return !f.apply(f, arguments);
        };
      };
  
      var and = function (fA, fB) {
        return function (item) {
          return fA(item) && fB(item);
        };
      };
  
      var self = function (a) {
        return a;
      };
  
      var invoke = function (obj, method) {
        return function () {
          return obj[method].apply(obj, arguments);
        };
      };
  
      var idCounter = 0;
  
      /**
       * generate a globally-unique id
       *
       * @param {String} [prefix]
       */
      var uniqueId = function (prefix) {
        var id = ++idCounter + '';
        return prefix ? prefix + id : id;
      };
  
      /**
       * returns bnd (bounds) from rect
       *
       * - IE Compatibility Issue: http://goo.gl/sRLOAo
       * - Scroll Issue: http://goo.gl/sNjUc
       *
       * @param {Rect} rect
       * @return {Object} bounds
       * @return {Number} bounds.top
       * @return {Number} bounds.left
       * @return {Number} bounds.width
       * @return {Number} bounds.height
       */
      var rect2bnd = function (rect) {
        var $document = $(document);
        return {
          top: rect.top + $document.scrollTop(),
          left: rect.left + $document.scrollLeft(),
          width: rect.right - rect.left,
          height: rect.bottom - rect.top
        };
      };
  
      /**
       * returns a copy of the object where the keys have become the values and the values the keys.
       * @param {Object} obj
       * @return {Object}
       */
      var invertObject = function (obj) {
        var inverted = {};
        for (var key in obj) {
          if (obj.hasOwnProperty(key)) {
            inverted[obj[key]] = key;
          }
        }
        return inverted;
      };
  
      /**
       * @param {String} namespace
       * @param {String} [prefix]
       * @return {String}
       */
      var namespaceToCamel = function (namespace, prefix) {
        prefix = prefix || '';
        return prefix + namespace.split('.').map(function (name) {
          return name.substring(0, 1).toUpperCase() + name.substring(1);
        }).join('');
      };
  
      return {
        eq: eq,
        eq2: eq2,
        peq2: peq2,
        ok: ok,
        fail: fail,
        self: self,
        not: not,
        and: and,
        invoke: invoke,
        uniqueId: uniqueId,
        rect2bnd: rect2bnd,
        invertObject: invertObject,
        namespaceToCamel: namespaceToCamel
      };
    })();
  
    /**
     * @class core.list
     *
     * list utils
     *
     * @singleton
     * @alternateClassName list
     */
    var list = (function () {
      /**
       * returns the first item of an array.
       *
       * @param {Array} array
       */
      var head = function (array) {
        return array[0];
      };
  
      /**
       * returns the last item of an array.
       *
       * @param {Array} array
       */
      var last = function (array) {
        return array[array.length - 1];
      };
  
      /**
       * returns everything but the last entry of the array.
       *
       * @param {Array} array
       */
      var initial = function (array) {
        return array.slice(0, array.length - 1);
      };
  
      /**
       * returns the rest of the items in an array.
       *
       * @param {Array} array
       */
      var tail = function (array) {
        return array.slice(1);
      };
  
      /**
       * returns item of array
       */
      var find = function (array, pred) {
        for (var idx = 0, len = array.length; idx < len; idx ++) {
          var item = array[idx];
          if (pred(item)) {
            return item;
          }
        }
      };
  
      /**
       * returns true if all of the values in the array pass the predicate truth test.
       */
      var all = function (array, pred) {
        for (var idx = 0, len = array.length; idx < len; idx ++) {
          if (!pred(array[idx])) {
            return false;
          }
        }
        return true;
      };
  
      /**
       * returns index of item
       */
      var indexOf = function (array, item) {
        return $.inArray(item, array);
      };
  
      /**
       * returns true if the value is present in the list.
       */
      var contains = function (array, item) {
        return indexOf(array, item) !== -1;
      };
  
      /**
       * get sum from a list
       *
       * @param {Array} array - array
       * @param {Function} fn - iterator
       */
      var sum = function (array, fn) {
        fn = fn || func.self;
        return array.reduce(function (memo, v) {
          return memo + fn(v);
        }, 0);
      };
    
      /**
       * returns a copy of the collection with array type.
       * @param {Collection} collection - collection eg) node.childNodes, ...
       */
      var from = function (collection) {
        var result = [], idx = -1, length = collection.length;
        while (++idx < length) {
          result[idx] = collection[idx];
        }
        return result;
      };
  
      /**
       * returns whether list is empty or not
       */
      var isEmpty = function (array) {
        return !array || !array.length;
      };
    
      /**
       * cluster elements by predicate function.
       *
       * @param {Array} array - array
       * @param {Function} fn - predicate function for cluster rule
       * @param {Array[]}
       */
      var clusterBy = function (array, fn) {
        if (!array.length) { return []; }
        var aTail = tail(array);
        return aTail.reduce(function (memo, v) {
          var aLast = last(memo);
          if (fn(last(aLast), v)) {
            aLast[aLast.length] = v;
          } else {
            memo[memo.length] = [v];
          }
          return memo;
        }, [[head(array)]]);
      };
    
      /**
       * returns a copy of the array with all falsy values removed
       *
       * @param {Array} array - array
       * @param {Function} fn - predicate function for cluster rule
       */
      var compact = function (array) {
        var aResult = [];
        for (var idx = 0, len = array.length; idx < len; idx ++) {
          if (array[idx]) { aResult.push(array[idx]); }
        }
        return aResult;
      };
  
      /**
       * produces a duplicate-free version of the array
       *
       * @param {Array} array
       */
      var unique = function (array) {
        var results = [];
  
        for (var idx = 0, len = array.length; idx < len; idx ++) {
          if (!contains(results, array[idx])) {
            results.push(array[idx]);
          }
        }
  
        return results;
      };
  
      /**
       * returns next item.
       * @param {Array} array
       */
      var next = function (array, item) {
        var idx = indexOf(array, item);
        if (idx === -1) { return null; }
  
        return array[idx + 1];
      };
  
      /**
       * returns prev item.
       * @param {Array} array
       */
      var prev = function (array, item) {
        var idx = indexOf(array, item);
        if (idx === -1) { return null; }
  
        return array[idx - 1];
      };
  
      return { head: head, last: last, initial: initial, tail: tail,
               prev: prev, next: next, find: find, contains: contains,
               all: all, sum: sum, from: from, isEmpty: isEmpty,
               clusterBy: clusterBy, compact: compact, unique: unique };
    })();
  
    var isSupportAmd = typeof define === 'function' && define.amd;
  
    /**
     * returns whether font is installed or not.
     *
     * @param {String} fontName
     * @return {Boolean}
     */
    var isFontInstalled = function (fontName) {
      var testFontName = fontName === 'Comic Sans MS' ? 'Courier New' : 'Comic Sans MS';
      var $tester = $('<div>').css({
        position: 'absolute',
        left: '-9999px',
        top: '-9999px',
        fontSize: '200px'
      }).text('mmmmmmmmmwwwwwww').appendTo(document.body);
  
      var originalWidth = $tester.css('fontFamily', testFontName).width();
      var width = $tester.css('fontFamily', fontName + ',' + testFontName).width();
  
      $tester.remove();
  
      return originalWidth !== width;
    };
  
    var userAgent = navigator.userAgent;
    var isMSIE = /MSIE|Trident/i.test(userAgent);
    var browserVersion;
    if (isMSIE) {
      var matches = /MSIE (\d+[.]\d+)/.exec(userAgent);
      if (matches) {
        browserVersion = parseFloat(matches[1]);
      }
      matches = /Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/.exec(userAgent);
      if (matches) {
        browserVersion = parseFloat(matches[1]);
      }
    }
  
    var isEdge = /Edge\/\d+/.test(userAgent);
  
    var hasCodeMirror = !!window.CodeMirror;
    if (!hasCodeMirror && isSupportAmd && require) {
      if (require.hasOwnProperty('resolve')) {
        try {
          // If CodeMirror can't be resolved, `require.resolve` will throw an
          // exception and `hasCodeMirror` won't be set to `true`.
          require.resolve('codemirror');
          hasCodeMirror = true;
        } catch (e) {
          hasCodeMirror = false;
        }
      } else if (require.hasOwnProperty('specified')) {
        hasCodeMirror = require.specified('codemirror');
      }
    }
  
    /**
     * @class core.agent
     *
     * Object which check platform and agent
     *
     * @singleton
     * @alternateClassName agent
     */
    var agent = {
      isMac: navigator.appVersion.indexOf('Mac') > -1,
      isMSIE: isMSIE,
      isEdge: isEdge,
      isFF: !isEdge && /firefox/i.test(userAgent),
      isPhantom: /PhantomJS/i.test(userAgent),
      isWebkit: !isEdge && /webkit/i.test(userAgent),
      isChrome: !isEdge && /chrome/i.test(userAgent),
      isSafari: !isEdge && /safari/i.test(userAgent),
      browserVersion: browserVersion,
      jqueryVersion: parseFloat($.fn.jquery),
      isSupportAmd: isSupportAmd,
      hasCodeMirror: hasCodeMirror,
      isFontInstalled: isFontInstalled,
      isW3CRangeSupport: !!document.createRange
    };
  
  
    var NBSP_CHAR = String.fromCharCode(160);
    var ZERO_WIDTH_NBSP_CHAR = '\ufeff';
  
    /**
     * @class core.dom
     *
     * Dom functions
     *
     * @singleton
     * @alternateClassName dom
     */
    var dom = (function () {
      /**
       * @method isEditable
       *
       * returns whether node is `note-editable` or not.
       *
       * @param {Node} node
       * @return {Boolean}
       */
      var isEditable = function (node) {
        return node && $(node).hasClass('note-editable');
      };
  
      /**
       * @method isControlSizing
       *
       * returns whether node is `note-control-sizing` or not.
       *
       * @param {Node} node
       * @return {Boolean}
       */
      var isControlSizing = function (node) {
        return node && $(node).hasClass('note-control-sizing');
      };
  
      /**
       * @method makePredByNodeName
       *
       * returns predicate which judge whether nodeName is same
       *
       * @param {String} nodeName
       * @return {Function}
       */
      var makePredByNodeName = function (nodeName) {
        nodeName = nodeName.toUpperCase();
        return function (node) {
          return node && node.nodeName.toUpperCase() === nodeName;
        };
      };
  
      /**
       * @method isText
       *
       *
       *
       * @param {Node} node
       * @return {Boolean} true if node's type is text(3)
       */
      var isText = function (node) {
        return node && node.nodeType === 3;
      };
  
      /**
       * @method isElement
       *
       *
       *
       * @param {Node} node
       * @return {Boolean} true if node's type is element(1)
       */
      var isElement = function (node) {
        return node && node.nodeType === 1;
      };
  
      /**
       * ex) br, col, embed, hr, img, input, ...
       * @see http://www.w3.org/html/wg/drafts/html/master/syntax.html#void-elements
       */
      var isVoid = function (node) {
        return node && /^BR|^IMG|^HR|^IFRAME|^BUTTON/.test(node.nodeName.toUpperCase());
      };
  
      var isPara = function (node) {
        if (isEditable(node)) {
          return false;
        }
  
        // Chrome(v31.0), FF(v25.0.1) use DIV for paragraph
        return node && /^DIV|^P|^LI|^H[1-7]/.test(node.nodeName.toUpperCase());
      };
  
      var isHeading = function (node) {
        return node && /^H[1-7]/.test(node.nodeName.toUpperCase());
      };
  
      var isPre = makePredByNodeName('PRE');
  
      var isLi = makePredByNodeName('LI');
  
      var isPurePara = function (node) {
        return isPara(node) && !isLi(node);
      };
  
      var isTable = makePredByNodeName('TABLE');
  
      var isInline = function (node) {
        return !isBodyContainer(node) &&
               !isList(node) &&
               !isHr(node) &&
               !isPara(node) &&
               !isTable(node) &&
               !isBlockquote(node);
      };
  
      var isList = function (node) {
        return node && /^UL|^OL/.test(node.nodeName.toUpperCase());
      };
  
      var isHr = makePredByNodeName('HR');
  
      var isCell = function (node) {
        return node && /^TD|^TH/.test(node.nodeName.toUpperCase());
      };
  
      var isBlockquote = makePredByNodeName('BLOCKQUOTE');
  
      var isBodyContainer = function (node) {
        return isCell(node) || isBlockquote(node) || isEditable(node);
      };
  
      var isAnchor = makePredByNodeName('A');
  
      var isParaInline = function (node) {
        return isInline(node) && !!ancestor(node, isPara);
      };
  
      var isBodyInline = function (node) {
        return isInline(node) && !ancestor(node, isPara);
      };
  
      var isBody = makePredByNodeName('BODY');
  
      /**
       * returns whether nodeB is closest sibling of nodeA
       *
       * @param {Node} nodeA
       * @param {Node} nodeB
       * @return {Boolean}
       */
      var isClosestSibling = function (nodeA, nodeB) {
        return nodeA.nextSibling === nodeB ||
               nodeA.previousSibling === nodeB;
      };
  
      /**
       * returns array of closest siblings with node
       *
       * @param {Node} node
       * @param {function} [pred] - predicate function
       * @return {Node[]}
       */
      var withClosestSiblings = function (node, pred) {
        pred = pred || func.ok;
  
        var siblings = [];
        if (node.previousSibling && pred(node.previousSibling)) {
          siblings.push(node.previousSibling);
        }
        siblings.push(node);
        if (node.nextSibling && pred(node.nextSibling)) {
          siblings.push(node.nextSibling);
        }
        return siblings;
      };
  
      /**
       * blank HTML for cursor position
       * - [workaround] old IE only works with &nbsp;
       * - [workaround] IE11 and other browser works with bogus br
       */
      var blankHTML = agent.isMSIE && agent.browserVersion < 11 ? '&nbsp;' : '<br>';
  
      /**
       * @method nodeLength
       *
       * returns #text's text size or element's childNodes size
       *
       * @param {Node} node
       */
      var nodeLength = function (node) {
        if (isText(node)) {
          return node.nodeValue.length;
        }
  
        return node.childNodes.length;
      };
  
      /**
       * returns whether node is empty or not.
       *
       * @param {Node} node
       * @return {Boolean}
       */
      var isEmpty = function (node) {
        var len = nodeLength(node);
  
        if (len === 0) {
          return true;
        } else if (!isText(node) && len === 1 && node.innerHTML === blankHTML) {
          // ex) <p><br></p>, <span><br></span>
          return true;
        } else if (list.all(node.childNodes, isText) && node.innerHTML === '') {
          // ex) <p></p>, <span></span>
          return true;
        }
  
        return false;
      };
  
      /**
       * padding blankHTML if node is empty (for cursor position)
       */
      var paddingBlankHTML = function (node) {
        if (!isVoid(node) && !nodeLength(node)) {
          node.innerHTML = blankHTML;
        }
      };
  
      /**
       * find nearest ancestor predicate hit
       *
       * @param {Node} node
       * @param {Function} pred - predicate function
       */
      var ancestor = function (node, pred) {
        while (node) {
          if (pred(node)) { return node; }
          if (isEditable(node)) { break; }
  
          node = node.parentNode;
        }
        return null;
      };
  
      /**
       * find nearest ancestor only single child blood line and predicate hit
       *
       * @param {Node} node
       * @param {Function} pred - predicate function
       */
      var singleChildAncestor = function (node, pred) {
        node = node.parentNode;
  
        while (node) {
          if (nodeLength(node) !== 1) { break; }
          if (pred(node)) { return node; }
          if (isEditable(node)) { break; }
  
          node = node.parentNode;
        }
        return null;
      };
  
      /**
       * returns new array of ancestor nodes (until predicate hit).
       *
       * @param {Node} node
       * @param {Function} [optional] pred - predicate function
       */
      var listAncestor = function (node, pred) {
        pred = pred || func.fail;
  
        var ancestors = [];
        ancestor(node, function (el) {
          if (!isEditable(el)) {
            ancestors.push(el);
          }
  
          return pred(el);
        });
        return ancestors;
      };
  
      /**
       * find farthest ancestor predicate hit
       */
      var lastAncestor = function (node, pred) {
        var ancestors = listAncestor(node);
        return list.last(ancestors.filter(pred));
      };
  
      /**
       * returns common ancestor node between two nodes.
       *
       * @param {Node} nodeA
       * @param {Node} nodeB
       */
      var commonAncestor = function (nodeA, nodeB) {
        var ancestors = listAncestor(nodeA);
        for (var n = nodeB; n; n = n.parentNode) {
          if ($.inArray(n, ancestors) > -1) { return n; }
        }
        return null; // difference document area
      };
  
      /**
       * listing all previous siblings (until predicate hit).
       *
       * @param {Node} node
       * @param {Function} [optional] pred - predicate function
       */
      var listPrev = function (node, pred) {
        pred = pred || func.fail;
  
        var nodes = [];
        while (node) {
          if (pred(node)) { break; }
          nodes.push(node);
          node = node.previousSibling;
        }
        return nodes;
      };
  
      /**
       * listing next siblings (until predicate hit).
       *
       * @param {Node} node
       * @param {Function} [pred] - predicate function
       */
      var listNext = function (node, pred) {
        pred = pred || func.fail;
  
        var nodes = [];
        while (node) {
          if (pred(node)) { break; }
          nodes.push(node);
          node = node.nextSibling;
        }
        return nodes;
      };
  
      /**
       * listing descendant nodes
       *
       * @param {Node} node
       * @param {Function} [pred] - predicate function
       */
      var listDescendant = function (node, pred) {
        var descendants = [];
        pred = pred || func.ok;
  
        // start DFS(depth first search) with node
        (function fnWalk(current) {
          if (node !== current && pred(current)) {
            descendants.push(current);
          }
          for (var idx = 0, len = current.childNodes.length; idx < len; idx++) {
            fnWalk(current.childNodes[idx]);
          }
        })(node);
  
        return descendants;
      };
  
      /**
       * wrap node with new tag.
       *
       * @param {Node} node
       * @param {Node} tagName of wrapper
       * @return {Node} - wrapper
       */
      var wrap = function (node, wrapperName) {
        var parent = node.parentNode;
        var wrapper = $('<' + wrapperName + '>')[0];
  
        parent.insertBefore(wrapper, node);
        wrapper.appendChild(node);
  
        return wrapper;
      };
  
      /**
       * insert node after preceding
       *
       * @param {Node} node
       * @param {Node} preceding - predicate function
       */
      var insertAfter = function (node, preceding) {
        var next = preceding.nextSibling, parent = preceding.parentNode;
        if (next) {
          parent.insertBefore(node, next);
        } else {
          parent.appendChild(node);
        }
        return node;
      };
  
      /**
       * append elements.
       *
       * @param {Node} node
       * @param {Collection} aChild
       */
      var appendChildNodes = function (node, aChild) {
        $.each(aChild, function (idx, child) {
          node.appendChild(child);
        });
        return node;
      };
  
      /**
       * returns whether boundaryPoint is left edge or not.
       *
       * @param {BoundaryPoint} point
       * @return {Boolean}
       */
      var isLeftEdgePoint = function (point) {
        return point.offset === 0;
      };
  
      /**
       * returns whether boundaryPoint is right edge or not.
       *
       * @param {BoundaryPoint} point
       * @return {Boolean}
       */
      var isRightEdgePoint = function (point) {
        return point.offset === nodeLength(point.node);
      };
  
      /**
       * returns whether boundaryPoint is edge or not.
       *
       * @param {BoundaryPoint} point
       * @return {Boolean}
       */
      var isEdgePoint = function (point) {
        return isLeftEdgePoint(point) || isRightEdgePoint(point);
      };
  
      /**
       * returns whether node is left edge of ancestor or not.
       *
       * @param {Node} node
       * @param {Node} ancestor
       * @return {Boolean}
       */
      var isLeftEdgeOf = function (node, ancestor) {
        while (node && node !== ancestor) {
          if (position(node) !== 0) {
            return false;
          }
          node = node.parentNode;
        }
  
        return true;
      };
  
      /**
       * returns whether node is right edge of ancestor or not.
       *
       * @param {Node} node
       * @param {Node} ancestor
       * @return {Boolean}
       */
      var isRightEdgeOf = function (node, ancestor) {
        while (node && node !== ancestor) {
          if (position(node) !== nodeLength(node.parentNode) - 1) {
            return false;
          }
          node = node.parentNode;
        }
  
        return true;
      };
  
      /**
       * returns whether point is left edge of ancestor or not.
       * @param {BoundaryPoint} point
       * @param {Node} ancestor
       * @return {Boolean}
       */
      var isLeftEdgePointOf = function (point, ancestor) {
        return isLeftEdgePoint(point) && isLeftEdgeOf(point.node, ancestor);
      };
  
      /**
       * returns whether point is right edge of ancestor or not.
       * @param {BoundaryPoint} point
       * @param {Node} ancestor
       * @return {Boolean}
       */
      var isRightEdgePointOf = function (point, ancestor) {
        return isRightEdgePoint(point) && isRightEdgeOf(point.node, ancestor);
      };
  
      /**
       * returns offset from parent.
       *
       * @param {Node} node
       */
      var position = function (node) {
        var offset = 0;
        while ((node = node.previousSibling)) {
          offset += 1;
        }
        return offset;
      };
  
      var hasChildren = function (node) {
        return !!(node && node.childNodes && node.childNodes.length);
      };
  
      /**
       * returns previous boundaryPoint
       *
       * @param {BoundaryPoint} point
       * @param {Boolean} isSkipInnerOffset
       * @return {BoundaryPoint}
       */
      var prevPoint = function (point, isSkipInnerOffset) {
        var node, offset;
  
        if (point.offset === 0) {
          if (isEditable(point.node)) {
            return null;
          }
  
          node = point.node.parentNode;
          offset = position(point.node);
        } else if (hasChildren(point.node)) {
          node = point.node.childNodes[point.offset - 1];
          offset = nodeLength(node);
        } else {
          node = point.node;
          offset = isSkipInnerOffset ? 0 : point.offset - 1;
        }
  
        return {
          node: node,
          offset: offset
        };
      };
  
      /**
       * returns next boundaryPoint
       *
       * @param {BoundaryPoint} point
       * @param {Boolean} isSkipInnerOffset
       * @return {BoundaryPoint}
       */
      var nextPoint = function (point, isSkipInnerOffset) {
        var node, offset;
  
        if (nodeLength(point.node) === point.offset) {
          if (isEditable(point.node)) {
            return null;
          }
  
          node = point.node.parentNode;
          offset = position(point.node) + 1;
        } else if (hasChildren(point.node)) {
          node = point.node.childNodes[point.offset];
          offset = 0;
        } else {
          node = point.node;
          offset = isSkipInnerOffset ? nodeLength(point.node) : point.offset + 1;
        }
  
        return {
          node: node,
          offset: offset
        };
      };
  
      /**
       * returns whether pointA and pointB is same or not.
       *
       * @param {BoundaryPoint} pointA
       * @param {BoundaryPoint} pointB
       * @return {Boolean}
       */
      var isSamePoint = function (pointA, pointB) {
        return pointA.node === pointB.node && pointA.offset === pointB.offset;
      };
  
      /**
       * returns whether point is visible (can set cursor) or not.
       * 
       * @param {BoundaryPoint} point
       * @return {Boolean}
       */
      var isVisiblePoint = function (point) {
        if (isText(point.node) || !hasChildren(point.node) || isEmpty(point.node)) {
          return true;
        }
  
        var leftNode = point.node.childNodes[point.offset - 1];
        var rightNode = point.node.childNodes[point.offset];
        if ((!leftNode || isVoid(leftNode)) && (!rightNode || isVoid(rightNode))) {
          return true;
        }
  
        return false;
      };
  
      /**
       * @method prevPointUtil
       *
       * @param {BoundaryPoint} point
       * @param {Function} pred
       * @return {BoundaryPoint}
       */
      var prevPointUntil = function (point, pred) {
        while (point) {
          if (pred(point)) {
            return point;
          }
  
          point = prevPoint(point);
        }
  
        return null;
      };
  
      /**
       * @method nextPointUntil
       *
       * @param {BoundaryPoint} point
       * @param {Function} pred
       * @return {BoundaryPoint}
       */
      var nextPointUntil = function (point, pred) {
        while (point) {
          if (pred(point)) {
            return point;
          }
  
          point = nextPoint(point);
        }
  
        return null;
      };
  
      /**
       * returns whether point has character or not.
       *
       * @param {Point} point
       * @return {Boolean}
       */
      var isCharPoint = function (point) {
        if (!isText(point.node)) {
          return false;
        }
  
        var ch = point.node.nodeValue.charAt(point.offset - 1);
        return ch && (ch !== ' ' && ch !== NBSP_CHAR);
      };
  
      /**
       * @method walkPoint
       *
       * @param {BoundaryPoint} startPoint
       * @param {BoundaryPoint} endPoint
       * @param {Function} handler
       * @param {Boolean} isSkipInnerOffset
       */
      var walkPoint = function (startPoint, endPoint, handler, isSkipInnerOffset) {
        var point = startPoint;
  
        while (point) {
          handler(point);
  
          if (isSamePoint(point, endPoint)) {
            break;
          }
  
          var isSkipOffset = isSkipInnerOffset &&
                             startPoint.node !== point.node &&
                             endPoint.node !== point.node;
          point = nextPoint(point, isSkipOffset);
        }
      };
  
      /**
       * @method makeOffsetPath
       *
       * return offsetPath(array of offset) from ancestor
       *
       * @param {Node} ancestor - ancestor node
       * @param {Node} node
       */
      var makeOffsetPath = function (ancestor, node) {
        var ancestors = listAncestor(node, func.eq(ancestor));
        return ancestors.map(position).reverse();
      };
  
      /**
       * @method fromOffsetPath
       *
       * return element from offsetPath(array of offset)
       *
       * @param {Node} ancestor - ancestor node
       * @param {array} offsets - offsetPath
       */
      var fromOffsetPath = function (ancestor, offsets) {
        var current = ancestor;
        for (var i = 0, len = offsets.length; i < len; i++) {
          if (current.childNodes.length <= offsets[i]) {
            current = current.childNodes[current.childNodes.length - 1];
          } else {
            current = current.childNodes[offsets[i]];
          }
        }
        return current;
      };
  
      /**
       * @method splitNode
       *
       * split element or #text
       *
       * @param {BoundaryPoint} point
       * @param {Object} [options]
       * @param {Boolean} [options.isSkipPaddingBlankHTML] - default: false
       * @param {Boolean} [options.isNotSplitEdgePoint] - default: false
       * @return {Node} right node of boundaryPoint
       */
      var splitNode = function (point, options) {
        var isSkipPaddingBlankHTML = options && options.isSkipPaddingBlankHTML;
        var isNotSplitEdgePoint = options && options.isNotSplitEdgePoint;
  
        // edge case
        if (isEdgePoint(point) && (isText(point.node) || isNotSplitEdgePoint)) {
          if (isLeftEdgePoint(point)) {
            return point.node;
          } else if (isRightEdgePoint(point)) {
            return point.node.nextSibling;
          }
        }
  
        // split #text
        if (isText(point.node)) {
          return point.node.splitText(point.offset);
        } else {
          var childNode = point.node.childNodes[point.offset];
          var clone = insertAfter(point.node.cloneNode(false), point.node);
          appendChildNodes(clone, listNext(childNode));
  
          if (!isSkipPaddingBlankHTML) {
            paddingBlankHTML(point.node);
            paddingBlankHTML(clone);
          }
  
          return clone;
        }
      };
  
      /**
       * @method splitTree
       *
       * split tree by point
       *
       * @param {Node} root - split root
       * @param {BoundaryPoint} point
       * @param {Object} [options]
       * @param {Boolean} [options.isSkipPaddingBlankHTML] - default: false
       * @param {Boolean} [options.isNotSplitEdgePoint] - default: false
       * @return {Node} right node of boundaryPoint
       */
      var splitTree = function (root, point, options) {
        // ex) [#text, <span>, <p>]
        var ancestors = listAncestor(point.node, func.eq(root));
  
        if (!ancestors.length) {
          return null;
        } else if (ancestors.length === 1) {
          return splitNode(point, options);
        }
  
        return ancestors.reduce(function (node, parent) {
          if (node === point.node) {
            node = splitNode(point, options);
          }
  
          return splitNode({
            node: parent,
            offset: node ? dom.position(node) : nodeLength(parent)
          }, options);
        });
      };
  
      /**
       * split point
       *
       * @param {Point} point
       * @param {Boolean} isInline
       * @return {Object}
       */
      var splitPoint = function (point, isInline) {
        // find splitRoot, container
        //  - inline: splitRoot is a child of paragraph
        //  - block: splitRoot is a child of bodyContainer
        var pred = isInline ? isPara : isBodyContainer;
        var ancestors = listAncestor(point.node, pred);
        var topAncestor = list.last(ancestors) || point.node;
  
        var splitRoot, container;
        if (pred(topAncestor)) {
          splitRoot = ancestors[ancestors.length - 2];
          container = topAncestor;
        } else {
          splitRoot = topAncestor;
          container = splitRoot.parentNode;
        }
  
        // if splitRoot is exists, split with splitTree
        var pivot = splitRoot && splitTree(splitRoot, point, {
          isSkipPaddingBlankHTML: isInline,
          isNotSplitEdgePoint: isInline
        });
  
        // if container is point.node, find pivot with point.offset
        if (!pivot && container === point.node) {
          pivot = point.node.childNodes[point.offset];
        }
  
        return {
          rightNode: pivot,
          container: container
        };
      };
  
      var create = function (nodeName) {
        return document.createElement(nodeName);
      };
  
      var createText = function (text) {
        return document.createTextNode(text);
      };
  
      /**
       * @method remove
       *
       * remove node, (isRemoveChild: remove child or not)
       *
       * @param {Node} node
       * @param {Boolean} isRemoveChild
       */
      var remove = function (node, isRemoveChild) {
        if (!node || !node.parentNode) { return; }
        if (node.removeNode) { return node.removeNode(isRemoveChild); }
  
        var parent = node.parentNode;
        if (!isRemoveChild) {
          var nodes = [];
          var i, len;
          for (i = 0, len = node.childNodes.length; i < len; i++) {
            nodes.push(node.childNodes[i]);
          }
  
          for (i = 0, len = nodes.length; i < len; i++) {
            parent.insertBefore(nodes[i], node);
          }
        }
  
        parent.removeChild(node);
      };
  
      /**
       * @method removeWhile
       *
       * @param {Node} node
       * @param {Function} pred
       */
      var removeWhile = function (node, pred) {
        while (node) {
          if (isEditable(node) || !pred(node)) {
            break;
          }
  
          var parent = node.parentNode;
          remove(node);
          node = parent;
        }
      };
  
      /**
       * @method replace
       *
       * replace node with provided nodeName
       *
       * @param {Node} node
       * @param {String} nodeName
       * @return {Node} - new node
       */
      var replace = function (node, nodeName) {
        if (node.nodeName.toUpperCase() === nodeName.toUpperCase()) {
          return node;
        }
  
        var newNode = create(nodeName);
  
        if (node.style.cssText) {
          newNode.style.cssText = node.style.cssText;
        }
  
        appendChildNodes(newNode, list.from(node.childNodes));
        insertAfter(newNode, node);
        remove(node);
  
        return newNode;
      };
  
      var isTextarea = makePredByNodeName('TEXTAREA');
  
      /**
       * @param {jQuery} $node
       * @param {Boolean} [stripLinebreaks] - default: false
       */
      var value = function ($node, stripLinebreaks) {
        var val = isTextarea($node[0]) ? $node.val() : $node.html();
        if (stripLinebreaks) {
          return val.replace(/[\n\r]/g, '');
        }
        return val;
      };
  
      /**
       * @method html
       *
       * get the HTML contents of node
       *
       * @param {jQuery} $node
       * @param {Boolean} [isNewlineOnBlock]
       */
      var html = function ($node, isNewlineOnBlock) {
        var markup = value($node);
  
        if (isNewlineOnBlock) {
          var regexTag = /<(\/?)(\b(?!!)[^>\s]*)(.*?)(\s*\/?>)/g;
          markup = markup.replace(regexTag, function (match, endSlash, name) {
            name = name.toUpperCase();
            var isEndOfInlineContainer = /^DIV|^TD|^TH|^P|^LI|^H[1-7]/.test(name) &&
                                         !!endSlash;
            var isBlockNode = /^BLOCKQUOTE|^TABLE|^TBODY|^TR|^HR|^UL|^OL/.test(name);
  
            return match + ((isEndOfInlineContainer || isBlockNode) ? '\n' : '');
          });
          markup = $.trim(markup);
        }
  
        return markup;
      };
  
      var posFromPlaceholder = function (placeholder) {
        var $placeholder = $(placeholder);
        var pos = $placeholder.offset();
        var height = $placeholder.outerHeight(true); // include margin
  
        return {
          left: pos.left,
          top: pos.top + height
        };
      };
  
      var attachEvents = function ($node, events) {
        Object.keys(events).forEach(function (key) {
          $node.on(key, events[key]);
        });
      };
  
      var detachEvents = function ($node, events) {
        Object.keys(events).forEach(function (key) {
          $node.off(key, events[key]);
        });
      };
  
      return {
        /** @property {String} NBSP_CHAR */
        NBSP_CHAR: NBSP_CHAR,
        /** @property {String} ZERO_WIDTH_NBSP_CHAR */
        ZERO_WIDTH_NBSP_CHAR: ZERO_WIDTH_NBSP_CHAR,
        /** @property {String} blank */
        blank: blankHTML,
        /** @property {String} emptyPara */
        emptyPara: '<p>' + blankHTML + '</p>',
        makePredByNodeName: makePredByNodeName,
        isEditable: isEditable,
        isControlSizing: isControlSizing,
        isText: isText,
        isElement: isElement,
        isVoid: isVoid,
        isPara: isPara,
        isPurePara: isPurePara,
        isHeading: isHeading,
        isInline: isInline,
        isBlock: func.not(isInline),
        isBodyInline: isBodyInline,
        isBody: isBody,
        isParaInline: isParaInline,
        isPre: isPre,
        isList: isList,
        isTable: isTable,
        isCell: isCell,
        isBlockquote: isBlockquote,
        isBodyContainer: isBodyContainer,
        isAnchor: isAnchor,
        isDiv: makePredByNodeName('DIV'),
        isLi: isLi,
        isBR: makePredByNodeName('BR'),
        isSpan: makePredByNodeName('SPAN'),
        isB: makePredByNodeName('B'),
        isU: makePredByNodeName('U'),
        isS: makePredByNodeName('S'),
        isI: makePredByNodeName('I'),
        isImg: makePredByNodeName('IMG'),
        isTextarea: isTextarea,
        isEmpty: isEmpty,
        isEmptyAnchor: func.and(isAnchor, isEmpty),
        isClosestSibling: isClosestSibling,
        withClosestSiblings: withClosestSiblings,
        nodeLength: nodeLength,
        isLeftEdgePoint: isLeftEdgePoint,
        isRightEdgePoint: isRightEdgePoint,
        isEdgePoint: isEdgePoint,
        isLeftEdgeOf: isLeftEdgeOf,
        isRightEdgeOf: isRightEdgeOf,
        isLeftEdgePointOf: isLeftEdgePointOf,
        isRightEdgePointOf: isRightEdgePointOf,
        prevPoint: prevPoint,
        nextPoint: nextPoint,
        isSamePoint: isSamePoint,
        isVisiblePoint: isVisiblePoint,
        prevPointUntil: prevPointUntil,
        nextPointUntil: nextPointUntil,
        isCharPoint: isCharPoint,
        walkPoint: walkPoint,
        ancestor: ancestor,
        singleChildAncestor: singleChildAncestor,
        listAncestor: listAncestor,
        lastAncestor: lastAncestor,
        listNext: listNext,
        listPrev: listPrev,
        listDescendant: listDescendant,
        commonAncestor: commonAncestor,
        wrap: wrap,
        insertAfter: insertAfter,
        appendChildNodes: appendChildNodes,
        position: position,
        hasChildren: hasChildren,
        makeOffsetPath: makeOffsetPath,
        fromOffsetPath: fromOffsetPath,
        splitTree: splitTree,
        splitPoint: splitPoint,
        create: create,
        createText: createText,
        remove: remove,
        removeWhile: removeWhile,
        replace: replace,
        html: html,
        value: value,
        posFromPlaceholder: posFromPlaceholder,
        attachEvents: attachEvents,
        detachEvents: detachEvents
      };
    })();
  
    /**
     * @param {jQuery} $note
     * @param {Object} options
     * @return {Context}
     */
    var Context = function ($note, options) {
      var self = this;
  
      var ui = $.summernote.ui;
      this.memos = {};
      this.modules = {};
      this.layoutInfo = {};
      this.options = options;
  
      /**
       * create layout and initialize modules and other resources
       */
      this.initialize = function () {
        this.layoutInfo = ui.createLayout($note, options);
        this._initialize();
        $note.hide();
        return this;
      };
  
      /**
       * destroy modules and other resources and remove layout
       */
      this.destroy = function () {
        this._destroy();
        $note.removeData('summernote');
        ui.removeLayout($note, this.layoutInfo);
      };
  
      /**
       * destory modules and other resources and initialize it again
       */
      this.reset = function () {
        var disabled = self.isDisabled();
        this.code(dom.emptyPara);
        this._destroy();
        this._initialize();
  
        if (disabled) {
          self.disable();
        }
      };
  
      this._initialize = function () {
        // add optional buttons
        var buttons = $.extend({}, this.options.buttons);
        Object.keys(buttons).forEach(function (key) {
          self.memo('button.' + key, buttons[key]);
        });
  
        var modules = $.extend({}, this.options.modules, $.summernote.plugins || {});
  
        // add and initialize modules
        Object.keys(modules).forEach(function (key) {
          self.module(key, modules[key], true);
        });
  
        Object.keys(this.modules).forEach(function (key) {
          self.initializeModule(key);
        });
      };
  
      this._destroy = function () {
        // destroy modules with reversed order
        Object.keys(this.modules).reverse().forEach(function (key) {
          self.removeModule(key);
        });
  
        Object.keys(this.memos).forEach(function (key) {
          self.removeMemo(key);
        });
      };
  
      this.code = function (html) {
        var isActivated = this.invoke('codeview.isActivated');
  
        if (html === undefined) {
          this.invoke('codeview.sync');
          return isActivated ? this.layoutInfo.codable.val() : this.layoutInfo.editable.html();
        } else {
          if (isActivated) {
            this.layoutInfo.codable.val(html);
          } else {
            this.layoutInfo.editable.html(html);
          }
          $note.val(html);
          this.triggerEvent('change', html);
        }
      };
  
      this.isDisabled = function () {
        return this.layoutInfo.editable.attr('contenteditable') === 'false';
      };
  
      this.enable = function () {
        this.layoutInfo.editable.attr('contenteditable', true);
        this.invoke('toolbar.activate', true);
      };
  
      this.disable = function () {
        // close codeview if codeview is opend
        if (this.invoke('codeview.isActivated')) {
          this.invoke('codeview.deactivate');
        }
        this.layoutInfo.editable.attr('contenteditable', false);
        this.invoke('toolbar.deactivate', true);
      };
  
      this.triggerEvent = function () {
        var namespace = list.head(arguments);
        var args = list.tail(list.from(arguments));
  
        var callback = this.options.callbacks[func.namespaceToCamel(namespace, 'on')];
        if (callback) {
          callback.apply($note[0], args);
        }
        $note.trigger('summernote.' + namespace, args);
      };
  
      this.initializeModule = function (key) {
        var module = this.modules[key];
        module.shouldInitialize = module.shouldInitialize || func.ok;
        if (!module.shouldInitialize()) {
          return;
        }
  
        // initialize module
        if (module.initialize) {
          module.initialize();
        }
  
        // attach events
        if (module.events) {
          dom.attachEvents($note, module.events);
        }
      };
  
      this.module = function (key, ModuleClass, withoutIntialize) {
        if (arguments.length === 1) {
          return this.modules[key];
        }
  
        this.modules[key] = new ModuleClass(this);
  
        if (!withoutIntialize) {
          this.initializeModule(key);
        }
      };
  
      this.removeModule = function (key) {
        var module = this.modules[key];
        if (module.shouldInitialize()) {
          if (module.events) {
            dom.detachEvents($note, module.events);
          }
  
          if (module.destroy) {
            module.destroy();
          }
        }
  
        delete this.modules[key];
      };
  
      this.memo = function (key, obj) {
        if (arguments.length === 1) {
          return this.memos[key];
        }
        this.memos[key] = obj;
      };
  
      this.removeMemo = function (key) {
        if (this.memos[key] && this.memos[key].destroy) {
          this.memos[key].destroy();
        }
  
        delete this.memos[key];
      };
  
      this.createInvokeHandler = function (namespace, value) {
        return function (event) {
          event.preventDefault();
          self.invoke(namespace, value || $(event.target).closest('[data-value]').data('value'));
        };
      };
  
      this.invoke = function () {
        var namespace = list.head(arguments);
        var args = list.tail(list.from(arguments));
  
        var splits = namespace.split('.');
        var hasSeparator = splits.length > 1;
        var moduleName = hasSeparator && list.head(splits);
        var methodName = hasSeparator ? list.last(splits) : list.head(splits);
  
        var module = this.modules[moduleName || 'editor'];
        if (!moduleName && this[methodName]) {
          return this[methodName].apply(this, args);
        } else if (module && module[methodName] && module.shouldInitialize()) {
          return module[methodName].apply(module, args);
        }
      };
  
      return this.initialize();
    };
  
    $.fn.extend({
      /**
       * Summernote API
       *
       * @param {Object|String}
       * @return {this}
       */
      summernote: function () {
        var type = $.type(list.head(arguments));
        var isExternalAPICalled = type === 'string';
        var hasInitOptions = type === 'object';
  
        var options = hasInitOptions ? list.head(arguments) : {};
  
        options = $.extend({}, $.summernote.options, options);
        options.langInfo = $.extend(true, {}, $.summernote.lang['en-US'], $.summernote.lang[options.lang]);
  
        this.each(function (idx, note) {
          var $note = $(note);
          if (!$note.data('summernote')) {
            var context = new Context($note, options);
            $note.data('summernote', context);
            $note.data('summernote').triggerEvent('init', context.layoutInfo);
          }
        });
  
        var $note = this.first();
        if ($note.length) {
          var context = $note.data('summernote');
          if (isExternalAPICalled) {
            return context.invoke.apply(context, list.from(arguments));
          } else if (options.focus) {
            context.invoke('editor.focus');
          }
        }
  
        return this;
      }
    });
  
  
    var Renderer = function (markup, children, options, callback) {
      this.render = function ($parent) {
        var $node = $(markup);
  
        if (options && options.contents) {
          $node.html(options.contents);
        }
  
        if (options && options.className) {
          $node.addClass(options.className);
        }
  
        if (options && options.data) {
          $.each(options.data, function (k, v) {
            $node.attr('data-' + k, v);
          });
        }
  
        if (options && options.click) {
          $node.on('click', options.click);
        }
  
        if (children) {
          var $container = $node.find('.note-children-container');
          children.forEach(function (child) {
            child.render($container.length ? $container : $node);
          });
        }
  
        if (callback) {
          callback($node, options);
        }
  
        if (options && options.callback) {
          options.callback($node);
        }
  
        if ($parent) {
          $parent.append($node);
        }
  
        return $node;
      };
    };
  
    var renderer = {
      create: function (markup, callback) {
        return function () {
          var children = $.isArray(arguments[0]) ? arguments[0] : [];
          var options = typeof arguments[1] === 'object' ? arguments[1] : arguments[0];
          if (options && options.children) {
            children = options.children;
          }
          return new Renderer(markup, children, options, callback);
        };
      }
    };
  
    var editor = renderer.create('<div class="note-editor note-frame panel panel-default"/>');
    var toolbar = renderer.create('<div class="note-toolbar panel-heading"/>');
    var editingArea = renderer.create('<div class="note-editing-area"/>');
    var codable = renderer.create('<textarea class="note-codable"/>');
    var editable = renderer.create('<div class="note-editable panel-body" contentEditable="true"/>');
    var statusbar = renderer.create([
      '<div class="note-statusbar">',
      '  <div class="note-resizebar">',
      '    <div class="note-icon-bar"/>',
      '    <div class="note-icon-bar"/>',
      '    <div class="note-icon-bar"/>',
      '  </div>',
      '</div>'
    ].join(''));
  
    var airEditor = renderer.create('<div class="note-editor"/>');
    var airEditable = renderer.create('<div class="note-editable" contentEditable="true"/>');
  
    var buttonGroup = renderer.create('<div class="note-btn-group btn-group">');
    var button = renderer.create('<button type="button" class="note-btn btn btn-default btn-sm">', function ($node, options) {
      if (options && options.tooltip) {
        $node.attr({
          title: options.tooltip
        }).tooltip({
          container: 'body',
          trigger: 'hover',
          placement: 'bottom'
        });
      }
    });
  
    var dropdown = renderer.create('<div class="dropdown-menu">', function ($node, options) {
      var markup = $.isArray(options.items) ? options.items.map(function (item) {
        var value = (typeof item === 'string') ? item : (item.value || '');
        var content = options.template ? options.template(item) : item;
        return '<li><a href="#" data-value="' + value + '">' + content + '</a></li>';
      }).join('') : options.items;
  
      $node.html(markup);
    });
  
    var dropdownCheck = renderer.create('<div class="dropdown-menu note-check">', function ($node, options) {
      var markup = $.isArray(options.items) ? options.items.map(function (item) {
        var value = (typeof item === 'string') ? item : (item.value || '');
        var content = options.template ? options.template(item) : item;
        return '<li><a href="#" data-value="' + value + '">' + icon(options.checkClassName) + ' ' + content + '</a></li>';
      }).join('') : options.items;
      $node.html(markup);
    });
  
    var palette = renderer.create('<div class="note-color-palette"/>', function ($node, options) {
      var contents = [];
      for (var row = 0, rowSize = options.colors.length; row < rowSize; row++) {
        var eventName = options.eventName;
        var colors = options.colors[row];
        var buttons = [];
        for (var col = 0, colSize = colors.length; col < colSize; col++) {
          var color = colors[col];
          buttons.push([
            '<button type="button" class="note-color-btn"',
            'style="background-color:', color, '" ',
            'data-event="', eventName, '" ',
            'data-value="', color, '" ',
            'title="', color, '" ',
            'data-toggle="button" tabindex="-1"></button>'
          ].join(''));
        }
        contents.push('<div class="note-color-row">' + buttons.join('') + '</div>');
      }
      $node.html(contents.join(''));
  
      $node.find('.note-color-btn').tooltip({
        container: 'body',
        trigger: 'hover',
        placement: 'bottom'
      });
    });
  
    var dialog = renderer.create('<div class="modal" aria-hidden="false" tabindex="-1"/>', function ($node, options) {
      if (options.fade) {
        $node.addClass('fade');
      }
      $node.html([
        '<div class="modal-dialog">',
        '  <div class="modal-content">',
        (options.title ?
        '    <div class="modal-header">' +
        '      <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>' +
        '      <h4 class="modal-title">' + options.title + '</h4>' +
        '    </div>' : ''
        ),
        '    <div class="modal-body">' + options.body + '</div>',
        (options.footer ?
        '    <div class="modal-footer">' + options.footer + '</div>' : ''
        ),
        '  </div>',
        '</div>'
      ].join(''));
    });
  
    var popover = renderer.create([
      '<div class="note-popover popover in">',
      '  <div class="arrow"/>',
      '  <div class="popover-content note-children-container"/>',
      '</div>'
    ].join(''), function ($node, options) {
      var direction = typeof options.direction !== 'undefined' ? options.direction : 'bottom';
  
      $node.addClass(direction);
  
      if (options.hideArrow) {
        $node.find('.arrow').hide();
      }
    });
  
    var icon = function (iconClassName, tagName) {
      tagName = tagName || 'i';
      return '<' + tagName + ' class="' + iconClassName + '"/>';
    };
  
    var ui = {
      editor: editor,
      toolbar: toolbar,
      editingArea: editingArea,
      codable: codable,
      editable: editable,
      statusbar: statusbar,
      airEditor: airEditor,
      airEditable: airEditable,
      buttonGroup: buttonGroup,
      button: button,
      dropdown: dropdown,
      dropdownCheck: dropdownCheck,
      palette: palette,
      dialog: dialog,
      popover: popover,
      icon: icon,
  
      toggleBtn: function ($btn, isEnable) {
        $btn.toggleClass('disabled', !isEnable);
        $btn.attr('disabled', !isEnable);
      },
  
      toggleBtnActive: function ($btn, isActive) {
        $btn.toggleClass('active', isActive);
      },
  
      onDialogShown: function ($dialog, handler) {
        $dialog.one('shown.bs.modal', handler);
      },
  
      onDialogHidden: function ($dialog, handler) {
        $dialog.one('hidden.bs.modal', handler);
      },
  
      showDialog: function ($dialog) {
        $dialog.modal('show');
      },
  
      hideDialog: function ($dialog) {
        $dialog.modal('hide');
      },
  
      createLayout: function ($note, options) {
        var $editor = (options.airMode ? ui.airEditor([
          ui.editingArea([
            ui.airEditable()
          ])
        ]) : ui.editor([
          ui.toolbar(),
          ui.editingArea([
            ui.codable(),
            ui.editable()
          ]),
          ui.statusbar()
        ])).render();
  
        $editor.insertAfter($note);
  
        return {
          note: $note,
          editor: $editor,
          toolbar: $editor.find('.note-toolbar'),
          editingArea: $editor.find('.note-editing-area'),
          editable: $editor.find('.note-editable'),
          codable: $editor.find('.note-codable'),
          statusbar: $editor.find('.note-statusbar')
        };
      },
  
      removeLayout: function ($note, layoutInfo) {
        $note.html(layoutInfo.editable.html());
        layoutInfo.editor.remove();
        $note.show();
      }
    };
  
    $.summernote = $.summernote || {
      lang: {}
    };
  
    $.extend($.summernote.lang, {
      'en-US': {
        font: {
          bold: 'Bold',
          italic: 'Italic',
          underline: 'Underline',
          clear: 'Remove Font Style',
          height: 'Line Height',
          name: 'Font Family',
          strikethrough: 'Strikethrough',
          subscript: 'Subscript',
          superscript: 'Superscript',
          size: 'Font Size'
        },
        image: {
          image: 'Picture',
          insert: 'Insert Image',
          resizeFull: 'Resize Full',
          resizeHalf: 'Resize Half',
          resizeQuarter: 'Resize Quarter',
          floatLeft: 'Float Left',
          floatRight: 'Float Right',
          floatNone: 'Float None',
          shapeRounded: 'Shape: Rounded',
          shapeCircle: 'Shape: Circle',
          shapeThumbnail: 'Shape: Thumbnail',
          shapeNone: 'Shape: None',
          dragImageHere: 'Drag image or text here',
          dropImage: 'Drop image or Text',
          selectFromFiles: 'Select from files',
          maximumFileSize: 'Maximum file size',
          maximumFileSizeError: 'Maximum file size exceeded.',
          url: 'Image URL',
          remove: 'Remove Image'
        },
        video: {
          video: 'Video',
          videoLink: 'Video Link',
          insert: 'Insert Video',
          url: 'Video URL?',
          providers: '(YouTube, Vimeo, Vine, Instagram, DailyMotion or Youku)'
        },
        link: {
          link: 'Link',
          insert: 'Insert Link',
          unlink: 'Unlink',
          edit: 'Edit',
          textToDisplay: 'Text to display',
          url: 'To what URL should this link go?',
          openInNewWindow: 'Open in new window'
        },
        table: {
          table: 'Table'
        },
        hr: {
          insert: 'Insert Horizontal Rule'
        },
        style: {
          style: 'Style',
          normal: 'Normal',
          blockquote: 'Quote',
          pre: 'Code',
          h1: 'Header 1',
          h2: 'Header 2',
          h3: 'Header 3',
          h4: 'Header 4',
          h5: 'Header 5',
          h6: 'Header 6'
        },
        lists: {
          unordered: 'Unordered list',
          ordered: 'Ordered list'
        },
        options: {
          help: 'Help',
          fullscreen: 'Full Screen',
          codeview: 'Code View'
        },
        paragraph: {
          paragraph: 'Paragraph',
          outdent: 'Outdent',
          indent: 'Indent',
          left: 'Align left',
          center: 'Align center',
          right: 'Align right',
          justify: 'Justify full'
        },
        color: {
          recent: 'Recent Color',
          more: 'More Color',
          background: 'Background Color',
          foreground: 'Foreground Color',
          transparent: 'Transparent',
          setTransparent: 'Set transparent',
          reset: 'Reset',
          resetToDefault: 'Reset to default'
        },
        shortcut: {
          shortcuts: 'Keyboard shortcuts',
          close: 'Close',
          textFormatting: 'Text formatting',
          action: 'Action',
          paragraphFormatting: 'Paragraph formatting',
          documentStyle: 'Document Style',
          extraKeys: 'Extra keys'
        },
        help: {
          'insertParagraph': 'Insert Paragraph',
          'undo': 'Undoes the last command',
          'redo': 'Redoes the last command',
          'tab': 'Tab',
          'untab': 'Untab',
          'bold': 'Set a bold style',
          'italic': 'Set a italic style',
          'underline': 'Set a underline style',
          'strikethrough': 'Set a strikethrough style',
          'removeFormat': 'Clean a style',
          'justifyLeft': 'Set left align',
          'justifyCenter': 'Set center align',
          'justifyRight': 'Set right align',
          'justifyFull': 'Set full align',
          'insertUnorderedList': 'Toggle unordered list',
          'insertOrderedList': 'Toggle ordered list',
          'outdent': 'Outdent on current paragraph',
          'indent': 'Indent on current paragraph',
          'formatPara': 'Change current block\'s format as a paragraph(P tag)',
          'formatH1': 'Change current block\'s format as H1',
          'formatH2': 'Change current block\'s format as H2',
          'formatH3': 'Change current block\'s format as H3',
          'formatH4': 'Change current block\'s format as H4',
          'formatH5': 'Change current block\'s format as H5',
          'formatH6': 'Change current block\'s format as H6',
          'insertHorizontalRule': 'Insert horizontal rule',
          'linkDialog.show': 'Show Link Dialog'
        },
        history: {
          undo: 'Undo',
          redo: 'Redo'
        },
        specialChar: {
          specialChar: 'SPECIAL CHARACTERS',
          select: 'Select Special characters'
        }
      }
    });
  
  
    /**
     * @class core.key
     *
     * Object for keycodes.
     *
     * @singleton
     * @alternateClassName key
     */
    var key = (function () {
      var keyMap = {
        'BACKSPACE': 8,
        'TAB': 9,
        'ENTER': 13,
        'SPACE': 32,
  
        // Arrow
        'LEFT': 37,
        'UP': 38,
        'RIGHT': 39,
        'DOWN': 40,
  
        // Number: 0-9
        'NUM0': 48,
        'NUM1': 49,
        'NUM2': 50,
        'NUM3': 51,
        'NUM4': 52,
        'NUM5': 53,
        'NUM6': 54,
        'NUM7': 55,
        'NUM8': 56,
  
        // Alphabet: a-z
        'B': 66,
        'E': 69,
        'I': 73,
        'J': 74,
        'K': 75,
        'L': 76,
        'R': 82,
        'S': 83,
        'U': 85,
        'V': 86,
        'Y': 89,
        'Z': 90,
  
        'SLASH': 191,
        'LEFTBRACKET': 219,
        'BACKSLASH': 220,
        'RIGHTBRACKET': 221
      };
  
      return {
        /**
         * @method isEdit
         *
         * @param {Number} keyCode
         * @return {Boolean}
         */
        isEdit: function (keyCode) {
          return list.contains([
            keyMap.BACKSPACE,
            keyMap.TAB,
            keyMap.ENTER,
            keyMap.SPACE
          ], keyCode);
        },
        /**
         * @method isMove
         *
         * @param {Number} keyCode
         * @return {Boolean}
         */
        isMove: function (keyCode) {
          return list.contains([
            keyMap.LEFT,
            keyMap.UP,
            keyMap.RIGHT,
            keyMap.DOWN
          ], keyCode);
        },
        /**
         * @property {Object} nameFromCode
         * @property {String} nameFromCode.8 "BACKSPACE"
         */
        nameFromCode: func.invertObject(keyMap),
        code: keyMap
      };
    })();
  
    var range = (function () {
  
      /**
       * return boundaryPoint from TextRange, inspired by Andy Na's HuskyRange.js
       *
       * @param {TextRange} textRange
       * @param {Boolean} isStart
       * @return {BoundaryPoint}
       *
       * @see http://msdn.microsoft.com/en-us/library/ie/ms535872(v=vs.85).aspx
       */
      var textRangeToPoint = function (textRange, isStart) {
        var container = textRange.parentElement(), offset;
    
        var tester = document.body.createTextRange(), prevContainer;
        var childNodes = list.from(container.childNodes);
        for (offset = 0; offset < childNodes.length; offset++) {
          if (dom.isText(childNodes[offset])) {
            continue;
          }
          tester.moveToElementText(childNodes[offset]);
          if (tester.compareEndPoints('StartToStart', textRange) >= 0) {
            break;
          }
          prevContainer = childNodes[offset];
        }
    
        if (offset !== 0 && dom.isText(childNodes[offset - 1])) {
          var textRangeStart = document.body.createTextRange(), curTextNode = null;
          textRangeStart.moveToElementText(prevContainer || container);
          textRangeStart.collapse(!prevContainer);
          curTextNode = prevContainer ? prevContainer.nextSibling : container.firstChild;
    
          var pointTester = textRange.duplicate();
          pointTester.setEndPoint('StartToStart', textRangeStart);
          var textCount = pointTester.text.replace(/[\r\n]/g, '').length;
    
          while (textCount > curTextNode.nodeValue.length && curTextNode.nextSibling) {
            textCount -= curTextNode.nodeValue.length;
            curTextNode = curTextNode.nextSibling;
          }
    
          /* jshint ignore:start */
          var dummy = curTextNode.nodeValue; // enforce IE to re-reference curTextNode, hack
          /* jshint ignore:end */
    
          if (isStart && curTextNode.nextSibling && dom.isText(curTextNode.nextSibling) &&
              textCount === curTextNode.nodeValue.length) {
            textCount -= curTextNode.nodeValue.length;
            curTextNode = curTextNode.nextSibling;
          }
    
          container = curTextNode;
          offset = textCount;
        }
    
        return {
          cont: container,
          offset: offset
        };
      };
      
      /**
       * return TextRange from boundary point (inspired by google closure-library)
       * @param {BoundaryPoint} point
       * @return {TextRange}
       */
      var pointToTextRange = function (point) {
        var textRangeInfo = function (container, offset) {
          var node, isCollapseToStart;
    
          if (dom.isText(container)) {
            var prevTextNodes = dom.listPrev(container, func.not(dom.isText));
            var prevContainer = list.last(prevTextNodes).previousSibling;
            node =  prevContainer || container.parentNode;
            offset += list.sum(list.tail(prevTextNodes), dom.nodeLength);
            isCollapseToStart = !prevContainer;
          } else {
            node = container.childNodes[offset] || container;
            if (dom.isText(node)) {
              return textRangeInfo(node, 0);
            }
    
            offset = 0;
            isCollapseToStart = false;
          }
    
          return {
            node: node,
            collapseToStart: isCollapseToStart,
            offset: offset
          };
        };
    
        var textRange = document.body.createTextRange();
        var info = textRangeInfo(point.node, point.offset);
    
        textRange.moveToElementText(info.node);
        textRange.collapse(info.collapseToStart);
        textRange.moveStart('character', info.offset);
        return textRange;
      };
      
      /**
       * Wrapped Range
       *
       * @constructor
       * @param {Node} sc - start container
       * @param {Number} so - start offset
       * @param {Node} ec - end container
       * @param {Number} eo - end offset
       */
      var WrappedRange = function (sc, so, ec, eo) {
        this.sc = sc;
        this.so = so;
        this.ec = ec;
        this.eo = eo;
    
        // nativeRange: get nativeRange from sc, so, ec, eo
        var nativeRange = function () {
          if (agent.isW3CRangeSupport) {
            var w3cRange = document.createRange();
            w3cRange.setStart(sc, so);
            w3cRange.setEnd(ec, eo);
  
            return w3cRange;
          } else {
            var textRange = pointToTextRange({
              node: sc,
              offset: so
            });
  
            textRange.setEndPoint('EndToEnd', pointToTextRange({
              node: ec,
              offset: eo
            }));
  
            return textRange;
          }
        };
  
        this.getPoints = function () {
          return {
            sc: sc,
            so: so,
            ec: ec,
            eo: eo
          };
        };
  
        this.getStartPoint = function () {
          return {
            node: sc,
            offset: so
          };
        };
  
        this.getEndPoint = function () {
          return {
            node: ec,
            offset: eo
          };
        };
  
        /**
         * select update visible range
         */
        this.select = function () {
          var nativeRng = nativeRange();
          if (agent.isW3CRangeSupport) {
            var selection = document.getSelection();
            if (selection.rangeCount > 0) {
              selection.removeAllRanges();
            }
            selection.addRange(nativeRng);
          } else {
            nativeRng.select();
          }
          
          return this;
        };
  
        /**
         * Moves the scrollbar to start container(sc) of current range
         *
         * @return {WrappedRange}
         */
        this.scrollIntoView = function (container) {
          var height = $(container).height();
          if (container.scrollTop + height < this.sc.offsetTop) {
            container.scrollTop += Math.abs(container.scrollTop + height - this.sc.offsetTop);
          }
  
          return this;
        };
  
        /**
         * @return {WrappedRange}
         */
        this.normalize = function () {
  
          /**
           * @param {BoundaryPoint} point
           * @param {Boolean} isLeftToRight
           * @return {BoundaryPoint}
           */
          var getVisiblePoint = function (point, isLeftToRight) {
            if ((dom.isVisiblePoint(point) && !dom.isEdgePoint(point)) ||
                (dom.isVisiblePoint(point) && dom.isRightEdgePoint(point) && !isLeftToRight) ||
                (dom.isVisiblePoint(point) && dom.isLeftEdgePoint(point) && isLeftToRight) ||
                (dom.isVisiblePoint(point) && dom.isBlock(point.node) && dom.isEmpty(point.node))) {
              return point;
            }
  
            // point on block's edge
            var block = dom.ancestor(point.node, dom.isBlock);
            if (((dom.isLeftEdgePointOf(point, block) || dom.isVoid(dom.prevPoint(point).node)) && !isLeftToRight) ||
                ((dom.isRightEdgePointOf(point, block) || dom.isVoid(dom.nextPoint(point).node)) && isLeftToRight)) {
  
              // returns point already on visible point
              if (dom.isVisiblePoint(point)) {
                return point;
              }
              // reverse direction 
              isLeftToRight = !isLeftToRight;
            }
  
            var nextPoint = isLeftToRight ? dom.nextPointUntil(dom.nextPoint(point), dom.isVisiblePoint) :
                                            dom.prevPointUntil(dom.prevPoint(point), dom.isVisiblePoint);
            return nextPoint || point;
          };
  
          var endPoint = getVisiblePoint(this.getEndPoint(), false);
          var startPoint = this.isCollapsed() ? endPoint : getVisiblePoint(this.getStartPoint(), true);
  
          return new WrappedRange(
            startPoint.node,
            startPoint.offset,
            endPoint.node,
            endPoint.offset
          );
        };
  
        /**
         * returns matched nodes on range
         *
         * @param {Function} [pred] - predicate function
         * @param {Object} [options]
         * @param {Boolean} [options.includeAncestor]
         * @param {Boolean} [options.fullyContains]
         * @return {Node[]}
         */
        this.nodes = function (pred, options) {
          pred = pred || func.ok;
  
          var includeAncestor = options && options.includeAncestor;
          var fullyContains = options && options.fullyContains;
  
          // TODO compare points and sort
          var startPoint = this.getStartPoint();
          var endPoint = this.getEndPoint();
  
          var nodes = [];
          var leftEdgeNodes = [];
  
          dom.walkPoint(startPoint, endPoint, function (point) {
            if (dom.isEditable(point.node)) {
              return;
            }
  
            var node;
            if (fullyContains) {
              if (dom.isLeftEdgePoint(point)) {
                leftEdgeNodes.push(point.node);
              }
              if (dom.isRightEdgePoint(point) && list.contains(leftEdgeNodes, point.node)) {
                node = point.node;
              }
            } else if (includeAncestor) {
              node = dom.ancestor(point.node, pred);
            } else {
              node = point.node;
            }
  
            if (node && pred(node)) {
              nodes.push(node);
            }
          }, true);
  
          return list.unique(nodes);
        };
  
        /**
         * returns commonAncestor of range
         * @return {Element} - commonAncestor
         */
        this.commonAncestor = function () {
          return dom.commonAncestor(sc, ec);
        };
  
        /**
         * returns expanded range by pred
         *
         * @param {Function} pred - predicate function
         * @return {WrappedRange}
         */
        this.expand = function (pred) {
          var startAncestor = dom.ancestor(sc, pred);
          var endAncestor = dom.ancestor(ec, pred);
  
          if (!startAncestor && !endAncestor) {
            return new WrappedRange(sc, so, ec, eo);
          }
  
          var boundaryPoints = this.getPoints();
  
          if (startAncestor) {
            boundaryPoints.sc = startAncestor;
            boundaryPoints.so = 0;
          }
  
          if (endAncestor) {
            boundaryPoints.ec = endAncestor;
            boundaryPoints.eo = dom.nodeLength(endAncestor);
          }
  
          return new WrappedRange(
            boundaryPoints.sc,
            boundaryPoints.so,
            boundaryPoints.ec,
            boundaryPoints.eo
          );
        };
  
        /**
         * @param {Boolean} isCollapseToStart
         * @return {WrappedRange}
         */
        this.collapse = function (isCollapseToStart) {
          if (isCollapseToStart) {
            return new WrappedRange(sc, so, sc, so);
          } else {
            return new WrappedRange(ec, eo, ec, eo);
          }
        };
  
        /**
         * splitText on range
         */
        this.splitText = function () {
          var isSameContainer = sc === ec;
          var boundaryPoints = this.getPoints();
  
          if (dom.isText(ec) && !dom.isEdgePoint(this.getEndPoint())) {
            ec.splitText(eo);
          }
  
          if (dom.isText(sc) && !dom.isEdgePoint(this.getStartPoint())) {
            boundaryPoints.sc = sc.splitText(so);
            boundaryPoints.so = 0;
  
            if (isSameContainer) {
              boundaryPoints.ec = boundaryPoints.sc;
              boundaryPoints.eo = eo - so;
            }
          }
  
          return new WrappedRange(
            boundaryPoints.sc,
            boundaryPoints.so,
            boundaryPoints.ec,
            boundaryPoints.eo
          );
        };
  
        /**
         * delete contents on range
         * @return {WrappedRange}
         */
        this.deleteContents = function () {
          if (this.isCollapsed()) {
            return this;
          }
  
          var rng = this.splitText();
          var nodes = rng.nodes(null, {
            fullyContains: true
          });
  
          // find new cursor point
          var point = dom.prevPointUntil(rng.getStartPoint(), function (point) {
            return !list.contains(nodes, point.node);
          });
  
          var emptyParents = [];
          $.each(nodes, function (idx, node) {
            // find empty parents
            var parent = node.parentNode;
            if (point.node !== parent && dom.nodeLength(parent) === 1) {
              emptyParents.push(parent);
            }
            dom.remove(node, false);
          });
  
          // remove empty parents
          $.each(emptyParents, function (idx, node) {
            dom.remove(node, false);
          });
  
          return new WrappedRange(
            point.node,
            point.offset,
            point.node,
            point.offset
          ).normalize();
        };
        
        /**
         * makeIsOn: return isOn(pred) function
         */
        var makeIsOn = function (pred) {
          return function () {
            var ancestor = dom.ancestor(sc, pred);
            return !!ancestor && (ancestor === dom.ancestor(ec, pred));
          };
        };
    
        // isOnEditable: judge whether range is on editable or not
        this.isOnEditable = makeIsOn(dom.isEditable);
        // isOnList: judge whether range is on list node or not
        this.isOnList = makeIsOn(dom.isList);
        // isOnAnchor: judge whether range is on anchor node or not
        this.isOnAnchor = makeIsOn(dom.isAnchor);
        // isOnAnchor: judge whether range is on cell node or not
        this.isOnCell = makeIsOn(dom.isCell);
  
        /**
         * @param {Function} pred
         * @return {Boolean}
         */
        this.isLeftEdgeOf = function (pred) {
          if (!dom.isLeftEdgePoint(this.getStartPoint())) {
            return false;
          }
  
          var node = dom.ancestor(this.sc, pred);
          return node && dom.isLeftEdgeOf(this.sc, node);
        };
  
        /**
         * returns whether range was collapsed or not
         */
        this.isCollapsed = function () {
          return sc === ec && so === eo;
        };
  
        /**
         * wrap inline nodes which children of body with paragraph
         *
         * @return {WrappedRange}
         */
        this.wrapBodyInlineWithPara = function () {
          if (dom.isBodyContainer(sc) && dom.isEmpty(sc)) {
            sc.innerHTML = dom.emptyPara;
            return new WrappedRange(sc.firstChild, 0, sc.firstChild, 0);
          }
  
          /**
           * [workaround] firefox often create range on not visible point. so normalize here.
           *  - firefox: |<p>text</p>|
           *  - chrome: <p>|text|</p>
           */
          var rng = this.normalize();
          if (dom.isParaInline(sc) || dom.isPara(sc)) {
            return rng;
          }
  
          // find inline top ancestor
          var topAncestor;
          if (dom.isInline(rng.sc)) {
            var ancestors = dom.listAncestor(rng.sc, func.not(dom.isInline));
            topAncestor = list.last(ancestors);
            if (!dom.isInline(topAncestor)) {
              topAncestor = ancestors[ancestors.length - 2] || rng.sc.childNodes[rng.so];
            }
          } else {
            topAncestor = rng.sc.childNodes[rng.so > 0 ? rng.so - 1 : 0];
          }
  
          // siblings not in paragraph
          var inlineSiblings = dom.listPrev(topAncestor, dom.isParaInline).reverse();
          inlineSiblings = inlineSiblings.concat(dom.listNext(topAncestor.nextSibling, dom.isParaInline));
  
          // wrap with paragraph
          if (inlineSiblings.length) {
            var para = dom.wrap(list.head(inlineSiblings), 'p');
            dom.appendChildNodes(para, list.tail(inlineSiblings));
          }
  
          return this.normalize();
        };
  
        /**
         * insert node at current cursor
         *
         * @param {Node} node
         * @return {Node}
         */
        this.insertNode = function (node) {
          var rng = this.wrapBodyInlineWithPara().deleteContents();
          var info = dom.splitPoint(rng.getStartPoint(), dom.isInline(node));
  
          if (info.rightNode) {
            info.rightNode.parentNode.insertBefore(node, info.rightNode);
          } else {
            info.container.appendChild(node);
          }
  
          return node;
        };
  
        /**
         * insert html at current cursor
         */
        this.pasteHTML = function (markup) {
          var contentsContainer = $('<div></div>').html(markup)[0];
          var childNodes = list.from(contentsContainer.childNodes);
  
          var rng = this.wrapBodyInlineWithPara().deleteContents();
  
          return childNodes.reverse().map(function (childNode) {
            return rng.insertNode(childNode);
          }).reverse();
        };
    
        /**
         * returns text in range
         *
         * @return {String}
         */
        this.toString = function () {
          var nativeRng = nativeRange();
          return agent.isW3CRangeSupport ? nativeRng.toString() : nativeRng.text;
        };
  
        /**
         * returns range for word before cursor
         *
         * @param {Boolean} [findAfter] - find after cursor, default: false
         * @return {WrappedRange}
         */
        this.getWordRange = function (findAfter) {
          var endPoint = this.getEndPoint();
  
          if (!dom.isCharPoint(endPoint)) {
            return this;
          }
  
          var startPoint = dom.prevPointUntil(endPoint, function (point) {
            return !dom.isCharPoint(point);
          });
  
          if (findAfter) {
            endPoint = dom.nextPointUntil(endPoint, function (point) {
              return !dom.isCharPoint(point);
            });
          }
  
          return new WrappedRange(
            startPoint.node,
            startPoint.offset,
            endPoint.node,
            endPoint.offset
          );
        };
    
        /**
         * create offsetPath bookmark
         *
         * @param {Node} editable
         */
        this.bookmark = function (editable) {
          return {
            s: {
              path: dom.makeOffsetPath(editable, sc),
              offset: so
            },
            e: {
              path: dom.makeOffsetPath(editable, ec),
              offset: eo
            }
          };
        };
  
        /**
         * create offsetPath bookmark base on paragraph
         *
         * @param {Node[]} paras
         */
        this.paraBookmark = function (paras) {
          return {
            s: {
              path: list.tail(dom.makeOffsetPath(list.head(paras), sc)),
              offset: so
            },
            e: {
              path: list.tail(dom.makeOffsetPath(list.last(paras), ec)),
              offset: eo
            }
          };
        };
  
        /**
         * getClientRects
         * @return {Rect[]}
         */
        this.getClientRects = function () {
          var nativeRng = nativeRange();
          return nativeRng.getClientRects();
        };
      };
  
    /**
     * @class core.range
     *
     * Data structure
     *  * BoundaryPoint: a point of dom tree
     *  * BoundaryPoints: two boundaryPoints corresponding to the start and the end of the Range
     *
     * See to http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level-2-Range-Position
     *
     * @singleton
     * @alternateClassName range
     */
      return {
        /**
         * create Range Object From arguments or Browser Selection
         *
         * @param {Node} sc - start container
         * @param {Number} so - start offset
         * @param {Node} ec - end container
         * @param {Number} eo - end offset
         * @return {WrappedRange}
         */
        create: function (sc, so, ec, eo) {
          if (arguments.length === 4) {
            return new WrappedRange(sc, so, ec, eo);
          } else if (arguments.length === 2) { //collapsed
            ec = sc;
            eo = so;
            return new WrappedRange(sc, so, ec, eo);
          } else {
            var wrappedRange = this.createFromSelection();
            if (!wrappedRange && arguments.length === 1) {
              wrappedRange = this.createFromNode(arguments[0]);
              return wrappedRange.collapse(dom.emptyPara === arguments[0].innerHTML);
            }
            return wrappedRange;
          }
        },
  
        createFromSelection: function () {
          var sc, so, ec, eo;
          if (agent.isW3CRangeSupport) {
            var selection = document.getSelection();
            if (!selection || selection.rangeCount === 0) {
              return null;
            } else if (dom.isBody(selection.anchorNode)) {
              // Firefox: returns entire body as range on initialization.
              // We won't never need it.
              return null;
            }
  
            var nativeRng = selection.getRangeAt(0);
            sc = nativeRng.startContainer;
            so = nativeRng.startOffset;
            ec = nativeRng.endContainer;
            eo = nativeRng.endOffset;
          } else { // IE8: TextRange
            var textRange = document.selection.createRange();
            var textRangeEnd = textRange.duplicate();
            textRangeEnd.collapse(false);
            var textRangeStart = textRange;
            textRangeStart.collapse(true);
  
            var startPoint = textRangeToPoint(textRangeStart, true),
            endPoint = textRangeToPoint(textRangeEnd, false);
  
            // same visible point case: range was collapsed.
            if (dom.isText(startPoint.node) && dom.isLeftEdgePoint(startPoint) &&
                dom.isTextNode(endPoint.node) && dom.isRightEdgePoint(endPoint) &&
                endPoint.node.nextSibling === startPoint.node) {
              startPoint = endPoint;
            }
  
            sc = startPoint.cont;
            so = startPoint.offset;
            ec = endPoint.cont;
            eo = endPoint.offset;
          }
  
          return new WrappedRange(sc, so, ec, eo);
        },
  
        /**
         * @method 
         * 
         * create WrappedRange from node
         *
         * @param {Node} node
         * @return {WrappedRange}
         */
        createFromNode: function (node) {
          var sc = node;
          var so = 0;
          var ec = node;
          var eo = dom.nodeLength(ec);
  
          // browsers can't target a picture or void node
          if (dom.isVoid(sc)) {
            so = dom.listPrev(sc).length - 1;
            sc = sc.parentNode;
          }
          if (dom.isBR(ec)) {
            eo = dom.listPrev(ec).length - 1;
            ec = ec.parentNode;
          } else if (dom.isVoid(ec)) {
            eo = dom.listPrev(ec).length;
            ec = ec.parentNode;
          }
  
          return this.create(sc, so, ec, eo);
        },
  
        /**
         * create WrappedRange from node after position
         *
         * @param {Node} node
         * @return {WrappedRange}
         */
        createFromNodeBefore: function (node) {
          return this.createFromNode(node).collapse(true);
        },
  
        /**
         * create WrappedRange from node after position
         *
         * @param {Node} node
         * @return {WrappedRange}
         */
        createFromNodeAfter: function (node) {
          return this.createFromNode(node).collapse();
        },
  
        /**
         * @method 
         * 
         * create WrappedRange from bookmark
         *
         * @param {Node} editable
         * @param {Object} bookmark
         * @return {WrappedRange}
         */
        createFromBookmark: function (editable, bookmark) {
          var sc = dom.fromOffsetPath(editable, bookmark.s.path);
          var so = bookmark.s.offset;
          var ec = dom.fromOffsetPath(editable, bookmark.e.path);
          var eo = bookmark.e.offset;
          return new WrappedRange(sc, so, ec, eo);
        },
  
        /**
         * @method 
         *
         * create WrappedRange from paraBookmark
         *
         * @param {Object} bookmark
         * @param {Node[]} paras
         * @return {WrappedRange}
         */
        createFromParaBookmark: function (bookmark, paras) {
          var so = bookmark.s.offset;
          var eo = bookmark.e.offset;
          var sc = dom.fromOffsetPath(list.head(paras), bookmark.s.path);
          var ec = dom.fromOffsetPath(list.last(paras), bookmark.e.path);
  
          return new WrappedRange(sc, so, ec, eo);
        }
      };
    })();
  
    /**
     * @class core.async
     *
     * Async functions which returns `Promise`
     *
     * @singleton
     * @alternateClassName async
     */
    var async = (function () {
      /**
       * @method readFileAsDataURL
       *
       * read contents of file as representing URL
       *
       * @param {File} file
       * @return {Promise} - then: dataUrl
       */
      var readFileAsDataURL = function (file) {
        return $.Deferred(function (deferred) {
          $.extend(new FileReader(), {
            onload: function (e) {
              var dataURL = e.target.result;
              deferred.resolve(dataURL);
            },
            onerror: function () {
              deferred.reject(this);
            }
          }).readAsDataURL(file);
        }).promise();
      };
    
      /**
       * @method createImage
       *
       * create `<image>` from url string
       *
       * @param {String} url
       * @return {Promise} - then: $image
       */
      var createImage = function (url) {
        return $.Deferred(function (deferred) {
          var $img = $('<img class="img-responsive b-link-stripe b-animate-go   swipebox" href="" title="" style="cursor: pointer;">');
  
          $img.one('load', function () {
            $img.off('error abort');
            deferred.resolve($img);
          }).one('error abort', function () {
            $img.off('load').detach();
            deferred.reject($img);
          }).css({
            display: 'none'
          }).appendTo(document.body).attr('src', url);
        }).promise();
      };
  
      return {
        readFileAsDataURL: readFileAsDataURL,
        createImage: createImage
      };
    })();
  
    /**
     * @class editing.History
     *
     * Editor History
     *
     */
    var History = function ($editable) {
      var stack = [], stackOffset = -1;
      var editable = $editable[0];
  
      var makeSnapshot = function () {
        var rng = range.create(editable);
        var emptyBookmark = {s: {path: [], offset: 0}, e: {path: [], offset: 0}};
  
        return {
          contents: $editable.html(),
          bookmark: (rng ? rng.bookmark(editable) : emptyBookmark)
        };
      };
  
      var applySnapshot = function (snapshot) {
        if (snapshot.contents !== null) {
          $editable.html(snapshot.contents);
        }
        if (snapshot.bookmark !== null) {
          range.createFromBookmark(editable, snapshot.bookmark).select();
        }
      };
  
      /**
      * @method rewind
      * Rewinds the history stack back to the first snapshot taken.
      * Leaves the stack intact, so that "Redo" can still be used.
      */
      this.rewind = function () {
        // Create snap shot if not yet recorded
        if ($editable.html() !== stack[stackOffset].contents) {
          this.recordUndo();
        }
  
        // Return to the first available snapshot.
        stackOffset = 0;
  
        // Apply that snapshot.
        applySnapshot(stack[stackOffset]);
      };
  
      /**
      * @method reset
      * Resets the history stack completely; reverting to an empty editor.
      */
      this.reset = function () {
        // Clear the stack.
        stack = [];
  
        // Restore stackOffset to its original value.
        stackOffset = -1;
  
        // Clear the editable area.
        $editable.html('');
  
        // Record our first snapshot (of nothing).
        this.recordUndo();
      };
  
      /**
       * undo
       */
      this.undo = function () {
        // Create snap shot if not yet recorded
        if ($editable.html() !== stack[stackOffset].contents) {
          this.recordUndo();
        }
  
        if (0 < stackOffset) {
          stackOffset--;
          applySnapshot(stack[stackOffset]);
        }
      };
  
      /**
       * redo
       */
      this.redo = function () {
        if (stack.length - 1 > stackOffset) {
          stackOffset++;
          applySnapshot(stack[stackOffset]);
        }
      };
  
      /**
       * recorded undo
       */
      this.recordUndo = function () {
        stackOffset++;
  
        // Wash out stack after stackOffset
        if (stack.length > stackOffset) {
          stack = stack.slice(0, stackOffset);
        }
  
        // Create new snapshot and push it to the end
        stack.push(makeSnapshot());
      };
    };
  
    /**
     * @class editing.Style
     *
     * Style
     *
     */
    var Style = function () {
      /**
       * @method jQueryCSS
       *
       * [workaround] for old jQuery
       * passing an array of style properties to .css()
       * will result in an object of property-value pairs.
       * (compability with version < 1.9)
       *
       * @private
       * @param  {jQuery} $obj
       * @param  {Array} propertyNames - An array of one or more CSS properties.
       * @return {Object}
       */
      var jQueryCSS = function ($obj, propertyNames) {
        if (agent.jqueryVersion < 1.9) {
          var result = {};
          $.each(propertyNames, function (idx, propertyName) {
            result[propertyName] = $obj.css(propertyName);
          });
          return result;
        }
        return $obj.css.call($obj, propertyNames);
      };
  
      /**
       * returns style object from node
       *
       * @param {jQuery} $node
       * @return {Object}
       */
      this.fromNode = function ($node) {
        var properties = ['font-family', 'font-size', 'text-align', 'list-style-type', 'line-height'];
        var styleInfo = jQueryCSS($node, properties) || {};
        styleInfo['font-size'] = parseInt(styleInfo['font-size'], 10);
        return styleInfo;
      };
  
      /**
       * paragraph level style
       *
       * @param {WrappedRange} rng
       * @param {Object} styleInfo
       */
      this.stylePara = function (rng, styleInfo) {
        $.each(rng.nodes(dom.isPara, {
          includeAncestor: true
        }), function (idx, para) {
          $(para).css(styleInfo);
        });
      };
  
      /**
       * insert and returns styleNodes on range.
       *
       * @param {WrappedRange} rng
       * @param {Object} [options] - options for styleNodes
       * @param {String} [options.nodeName] - default: `SPAN`
       * @param {Boolean} [options.expandClosestSibling] - default: `false`
       * @param {Boolean} [options.onlyPartialContains] - default: `false`
       * @return {Node[]}
       */
      this.styleNodes = function (rng, options) {
        rng = rng.splitText();
  
        var nodeName = options && options.nodeName || 'SPAN';
        var expandClosestSibling = !!(options && options.expandClosestSibling);
        var onlyPartialContains = !!(options && options.onlyPartialContains);
  
        if (rng.isCollapsed()) {
          return [rng.insertNode(dom.create(nodeName))];
        }
  
        var pred = dom.makePredByNodeName(nodeName);
        var nodes = rng.nodes(dom.isText, {
          fullyContains: true
        }).map(function (text) {
          return dom.singleChildAncestor(text, pred) || dom.wrap(text, nodeName);
        });
  
        if (expandClosestSibling) {
          if (onlyPartialContains) {
            var nodesInRange = rng.nodes();
            // compose with partial contains predication
            pred = func.and(pred, function (node) {
              return list.contains(nodesInRange, node);
            });
          }
  
          return nodes.map(function (node) {
            var siblings = dom.withClosestSiblings(node, pred);
            var head = list.head(siblings);
            var tails = list.tail(siblings);
            $.each(tails, function (idx, elem) {
              dom.appendChildNodes(head, elem.childNodes);
              dom.remove(elem);
            });
            return list.head(siblings);
          });
        } else {
          return nodes;
        }
      };
  
      /**
       * get current style on cursor
       *
       * @param {WrappedRange} rng
       * @return {Object} - object contains style properties.
       */
      this.current = function (rng) {
        var $cont = $(!dom.isElement(rng.sc) ? rng.sc.parentNode : rng.sc);
        var styleInfo = this.fromNode($cont);
  
        // document.queryCommandState for toggle state
        // [workaround] prevent Firefox nsresult: "0x80004005 (NS_ERROR_FAILURE)"
        try {
          styleInfo = $.extend(styleInfo, {
            'font-bold': document.queryCommandState('bold') ? 'bold' : 'normal',
            'font-italic': document.queryCommandState('italic') ? 'italic' : 'normal',
            'font-underline': document.queryCommandState('underline') ? 'underline' : 'normal',
            'font-subscript': document.queryCommandState('subscript') ? 'subscript' : 'normal',
            'font-superscript': document.queryCommandState('superscript') ? 'superscript' : 'normal',
            'font-strikethrough': document.queryCommandState('strikethrough') ? 'strikethrough' : 'normal'
          });
        } catch (e) {}
  
        // list-style-type to list-style(unordered, ordered)
        if (!rng.isOnList()) {
          styleInfo['list-style'] = 'none';
        } else {
          var orderedTypes = ['circle', 'disc', 'disc-leading-zero', 'square'];
          var isUnordered = $.inArray(styleInfo['list-style-type'], orderedTypes) > -1;
          styleInfo['list-style'] = isUnordered ? 'unordered' : 'ordered';
        }
  
        var para = dom.ancestor(rng.sc, dom.isPara);
        if (para && para.style['line-height']) {
          styleInfo['line-height'] = para.style.lineHeight;
        } else {
          var lineHeight = parseInt(styleInfo['line-height'], 10) / parseInt(styleInfo['font-size'], 10);
          styleInfo['line-height'] = lineHeight.toFixed(1);
        }
  
        styleInfo.anchor = rng.isOnAnchor() && dom.ancestor(rng.sc, dom.isAnchor);
        styleInfo.ancestors = dom.listAncestor(rng.sc, dom.isEditable);
        styleInfo.range = rng;
  
        return styleInfo;
      };
    };
  
  
    /**
     * @class editing.Bullet
     *
     * @alternateClassName Bullet
     */
    var Bullet = function () {
      var self = this;
  
      /**
       * toggle ordered list
       */
      this.insertOrderedList = function (editable) {
        this.toggleList('OL', editable);
      };
  
      /**
       * toggle unordered list
       */
      this.insertUnorderedList = function (editable) {
        this.toggleList('UL', editable);
      };
  
      /**
       * indent
       */
      this.indent = function (editable) {
        var self = this;
        var rng = range.create(editable).wrapBodyInlineWithPara();
  
        var paras = rng.nodes(dom.isPara, { includeAncestor: true });
        var clustereds = list.clusterBy(paras, func.peq2('parentNode'));
  
        $.each(clustereds, function (idx, paras) {
          var head = list.head(paras);
          if (dom.isLi(head)) {
            self.wrapList(paras, head.parentNode.nodeName);
          } else {
            $.each(paras, function (idx, para) {
              $(para).css('marginLeft', function (idx, val) {
                return (parseInt(val, 10) || 0) + 25;
              });
            });
          }
        });
  
        rng.select();
      };
  
      /**
       * outdent
       */
      this.outdent = function (editable) {
        var self = this;
        var rng = range.create(editable).wrapBodyInlineWithPara();
  
        var paras = rng.nodes(dom.isPara, { includeAncestor: true });
        var clustereds = list.clusterBy(paras, func.peq2('parentNode'));
  
        $.each(clustereds, function (idx, paras) {
          var head = list.head(paras);
          if (dom.isLi(head)) {
            self.releaseList([paras]);
          } else {
            $.each(paras, function (idx, para) {
              $(para).css('marginLeft', function (idx, val) {
                val = (parseInt(val, 10) || 0);
                return val > 25 ? val - 25 : '';
              });
            });
          }
        });
  
        rng.select();
      };
  
      /**
       * toggle list
       *
       * @param {String} listName - OL or UL
       */
      this.toggleList = function (listName, editable) {
        var rng = range.create(editable).wrapBodyInlineWithPara();
  
        var paras = rng.nodes(dom.isPara, { includeAncestor: true });
        var bookmark = rng.paraBookmark(paras);
        var clustereds = list.clusterBy(paras, func.peq2('parentNode'));
  
        // paragraph to list
        if (list.find(paras, dom.isPurePara)) {
          var wrappedParas = [];
          $.each(clustereds, function (idx, paras) {
            wrappedParas = wrappedParas.concat(self.wrapList(paras, listName));
          });
          paras = wrappedParas;
        // list to paragraph or change list style
        } else {
          var diffLists = rng.nodes(dom.isList, {
            includeAncestor: true
          }).filter(function (listNode) {
            return !$.nodeName(listNode, listName);
          });
  
          if (diffLists.length) {
            $.each(diffLists, function (idx, listNode) {
              dom.replace(listNode, listName);
            });
          } else {
            paras = this.releaseList(clustereds, true);
          }
        }
  
        range.createFromParaBookmark(bookmark, paras).select();
      };
  
      /**
       * @param {Node[]} paras
       * @param {String} listName
       * @return {Node[]}
       */
      this.wrapList = function (paras, listName) {
        var head = list.head(paras);
        var last = list.last(paras);
  
        var prevList = dom.isList(head.previousSibling) && head.previousSibling;
        var nextList = dom.isList(last.nextSibling) && last.nextSibling;
  
        var listNode = prevList || dom.insertAfter(dom.create(listName || 'UL'), last);
  
        // P to LI
        paras = paras.map(function (para) {
          return dom.isPurePara(para) ? dom.replace(para, 'LI') : para;
        });
  
        // append to list(<ul>, <ol>)
        dom.appendChildNodes(listNode, paras);
  
        if (nextList) {
          dom.appendChildNodes(listNode, list.from(nextList.childNodes));
          dom.remove(nextList);
        }
  
        return paras;
      };
  
      /**
       * @method releaseList
       *
       * @param {Array[]} clustereds
       * @param {Boolean} isEscapseToBody
       * @return {Node[]}
       */
      this.releaseList = function (clustereds, isEscapseToBody) {
        var releasedParas = [];
  
        $.each(clustereds, function (idx, paras) {
          var head = list.head(paras);
          var last = list.last(paras);
  
          var headList = isEscapseToBody ? dom.lastAncestor(head, dom.isList) :
                                           head.parentNode;
          var lastList = headList.childNodes.length > 1 ? dom.splitTree(headList, {
            node: last.parentNode,
            offset: dom.position(last) + 1
          }, {
            isSkipPaddingBlankHTML: true
          }) : null;
  
          var middleList = dom.splitTree(headList, {
            node: head.parentNode,
            offset: dom.position(head)
          }, {
            isSkipPaddingBlankHTML: true
          });
  
          paras = isEscapseToBody ? dom.listDescendant(middleList, dom.isLi) :
                                    list.from(middleList.childNodes).filter(dom.isLi);
  
          // LI to P
          if (isEscapseToBody || !dom.isList(headList.parentNode)) {
            paras = paras.map(function (para) {
              return dom.replace(para, 'P');
            });
          }
  
          $.each(list.from(paras).reverse(), function (idx, para) {
            dom.insertAfter(para, headList);
          });
  
          // remove empty lists
          var rootLists = list.compact([headList, middleList, lastList]);
          $.each(rootLists, function (idx, rootList) {
            var listNodes = [rootList].concat(dom.listDescendant(rootList, dom.isList));
            $.each(listNodes.reverse(), function (idx, listNode) {
              if (!dom.nodeLength(listNode)) {
                dom.remove(listNode, true);
              }
            });
          });
  
          releasedParas = releasedParas.concat(paras);
        });
  
        return releasedParas;
      };
    };
  
  
    /**
     * @class editing.Typing
     *
     * Typing
     *
     */
    var Typing = function () {
  
      // a Bullet instance to toggle lists off
      var bullet = new Bullet();
  
      /**
       * insert tab
       *
       * @param {WrappedRange} rng
       * @param {Number} tabsize
       */
      this.insertTab = function (rng, tabsize) {
        var tab = dom.createText(new Array(tabsize + 1).join(dom.NBSP_CHAR));
        rng = rng.deleteContents();
        rng.insertNode(tab, true);
  
        rng = range.create(tab, tabsize);
        rng.select();
      };
  
      /**
       * insert paragraph
       */
      this.insertParagraph = function (editable) {
        var rng = range.create(editable);
  
        // deleteContents on range.
        rng = rng.deleteContents();
  
        // Wrap range if it needs to be wrapped by paragraph
        rng = rng.wrapBodyInlineWithPara();
  
        // finding paragraph
        var splitRoot = dom.ancestor(rng.sc, dom.isPara);
  
        var nextPara;
        // on paragraph: split paragraph
        if (splitRoot) {
          // if it is an empty line with li
          if (dom.isEmpty(splitRoot) && dom.isLi(splitRoot)) {
            // toogle UL/OL and escape
            bullet.toggleList(splitRoot.parentNode.nodeName);
            return;
          // if it is an empty line with para on blockquote
          } else if (dom.isEmpty(splitRoot) && dom.isPara(splitRoot) && dom.isBlockquote(splitRoot.parentNode)) {
            // escape blockquote
            dom.insertAfter(splitRoot, splitRoot.parentNode);
            nextPara = splitRoot;
          // if new line has content (not a line break)
          } else {
            nextPara = dom.splitTree(splitRoot, rng.getStartPoint());
  
            var emptyAnchors = dom.listDescendant(splitRoot, dom.isEmptyAnchor);
            emptyAnchors = emptyAnchors.concat(dom.listDescendant(nextPara, dom.isEmptyAnchor));
  
            $.each(emptyAnchors, function (idx, anchor) {
              dom.remove(anchor);
            });
  
            // replace empty heading or pre with P tag
            if ((dom.isHeading(nextPara) || dom.isPre(nextPara)) && dom.isEmpty(nextPara)) {
              nextPara = dom.replace(nextPara, 'p');
            }
          }
        // no paragraph: insert empty paragraph
        } else {
          var next = rng.sc.childNodes[rng.so];
          nextPara = $(dom.emptyPara)[0];
          if (next) {
            rng.sc.insertBefore(nextPara, next);
          } else {
            rng.sc.appendChild(nextPara);
          }
        }
  
        range.create(nextPara, 0).normalize().select().scrollIntoView(editable);
      };
    };
  
    /**
     * @class editing.Table
     *
     * Table
     *
     */
    var Table = function () {
      /**
       * handle tab key
       *
       * @param {WrappedRange} rng
       * @param {Boolean} isShift
       */
      this.tab = function (rng, isShift) {
        var cell = dom.ancestor(rng.commonAncestor(), dom.isCell);
        var table = dom.ancestor(cell, dom.isTable);
        var cells = dom.listDescendant(table, dom.isCell);
  
        var nextCell = list[isShift ? 'prev' : 'next'](cells, cell);
        if (nextCell) {
          range.create(nextCell, 0).select();
        }
      };
  
      /**
       * create empty table element
       *
       * @param {Number} rowCount
       * @param {Number} colCount
       * @return {Node}
       */
      this.createTable = function (colCount, rowCount, options) {
        var tds = [], tdHTML;
        for (var idxCol = 0; idxCol < colCount; idxCol++) {
          tds.push('<td>' + dom.blank + '</td>');
        }
        tdHTML = tds.join('');
  
        var trs = [], trHTML;
        for (var idxRow = 0; idxRow < rowCount; idxRow++) {
          trs.push('<tr>' + tdHTML + '</tr>');
        }
        trHTML = trs.join('');
        var $table = $('<table>' + trHTML + '</table>');
        if (options && options.tableClassName) {
          $table.addClass(options.tableClassName);
        }
  
        return $table[0];
      };
    };
  
  
    var KEY_BOGUS = 'bogus';
  
    /**
     * @class Editor
     */
    var Editor = function (context) {
      var self = this;
  
      var $note = context.layoutInfo.note;
      var $editor = context.layoutInfo.editor;
      var $editable = context.layoutInfo.editable;
      var options = context.options;
      var lang = options.langInfo;
  
      var editable = $editable[0];
      var lastRange = null;
  
      var style = new Style();
      var table = new Table();
      var typing = new Typing();
      var bullet = new Bullet();
      var history = new History($editable);
  
      this.initialize = function () {
        // bind custom events
        $editable.on('keydown', function (event) {
          if (event.keyCode === key.code.ENTER) {
            context.triggerEvent('enter', event);
          }
          context.triggerEvent('keydown', event);
  
          if (options.shortcuts && !event.isDefaultPrevented()) {
            self.handleKeyMap(event);
          }
        }).on('keyup', function (event) {
          context.triggerEvent('keyup', event);
        }).on('focus', function (event) {
          context.triggerEvent('focus', event);
        }).on('blur', function (event) {
          context.triggerEvent('blur', event);
        }).on('mousedown', function (event) {
          context.triggerEvent('mousedown', event);
        }).on('mouseup', function (event) {
          context.triggerEvent('mouseup', event);
        }).on('scroll', function (event) {
          context.triggerEvent('scroll', event);
        }).on('paste', function (event) {
          context.triggerEvent('paste', event);
        });
  
        // init content before set event
        $editable.html(dom.html($note) || dom.emptyPara);
  
        // [workaround] IE doesn't have input events for contentEditable
        // - see: https://goo.gl/4bfIvA
        var changeEventName = agent.isMSIE ? 'DOMCharacterDataModified DOMSubtreeModified DOMNodeInserted' : 'input';
        $editable.on(changeEventName, function () {
          context.triggerEvent('change', $editable.html());
        });
  
        $editor.on('focusin', function (event) {
          context.triggerEvent('focusin', event);
        }).on('focusout', function (event) {
          context.triggerEvent('focusout', event);
        });
  
        if (!options.airMode && options.height) {
          this.setHeight(options.height);
        }
        if (!options.airMode && options.maxHeight) {
          $editable.css('max-height', options.maxHeight);
        }
        if (!options.airMode && options.minHeight) {
          $editable.css('min-height', options.minHeight);
        }
  
        history.recordUndo();
      };
  
      this.destroy = function () {
        $editable.off();
      };
  
      this.handleKeyMap = function (event) {
        var keyMap = options.keyMap[agent.isMac ? 'mac' : 'pc'];
        var keys = [];
  
        if (event.metaKey) { keys.push('CMD'); }
        if (event.ctrlKey && !event.altKey) { keys.push('CTRL'); }
        if (event.shiftKey) { keys.push('SHIFT'); }
  
        var keyName = key.nameFromCode[event.keyCode];
        if (keyName) {
          keys.push(keyName);
        }
  
        var eventName = keyMap[keys.join('+')];
        if (eventName) {
          event.preventDefault();
          context.invoke(eventName);
        } else if (key.isEdit(event.keyCode)) {
          this.afterCommand();
        }
      };
  
      /**
       * create range
       * @return {WrappedRange}
       */
      this.createRange = function () {
        this.focus();
        return range.create(editable);
      };
  
      /**
       * saveRange
       *
       * save current range
       *
       * @param {Boolean} [thenCollapse=false]
       */
      this.saveRange = function (thenCollapse) {
        lastRange = this.createRange();
        if (thenCollapse) {
          lastRange.collapse().select();
        }
      };
  
      /**
       * restoreRange
       *
       * restore lately range
       */
      this.restoreRange = function () {
        if (lastRange) {
          lastRange.select();
          this.focus();
        }
      };
  
      this.saveTarget = function (node) {
        $editable.data('target', node);
      };
  
      this.clearTarget = function () {
        $editable.removeData('target');
      };
  
      this.restoreTarget = function () {
        return $editable.data('target');
      };
  
      /**
       * currentStyle
       *
       * current style
       * @return {Object|Boolean} unfocus
       */
      this.currentStyle = function () {
        var rng = range.create();
        if (rng) {
          rng = rng.normalize();
        }
        return rng ? style.current(rng) : style.fromNode($editable);
      };
  
      /**
       * style from node
       *
       * @param {jQuery} $node
       * @return {Object}
       */
      this.styleFromNode = function ($node) {
        return style.fromNode($node);
      };
  
      /**
       * undo
       */
      this.undo = function () {
        context.triggerEvent('before.command', $editable.html());
        history.undo();
        context.triggerEvent('change', $editable.html());
      };
      context.memo('help.undo', lang.help.undo);
  
      /**
       * redo
       */
      this.redo = function () {
        context.triggerEvent('before.command', $editable.html());
        history.redo();
        context.triggerEvent('change', $editable.html());
      };
      context.memo('help.redo', lang.help.redo);
  
      /**
       * before command
       */
      var beforeCommand = this.beforeCommand = function () {
        context.triggerEvent('before.command', $editable.html());
        // keep focus on editable before command execution
        self.focus();
      };
  
      /**
       * after command
       * @param {Boolean} isPreventTrigger
       */
      var afterCommand = this.afterCommand = function (isPreventTrigger) {
        history.recordUndo();
        if (!isPreventTrigger) {
          context.triggerEvent('change', $editable.html());
        }
      };
  
      /* jshint ignore:start */
      // native commands(with execCommand), generate function for execCommand
      var commands = ['bold', 'italic', 'underline', 'strikethrough', 'superscript', 'subscript',
                      'justifyLeft', 'justifyCenter', 'justifyRight', 'justifyFull',
                      'formatBlock', 'removeFormat',
                      'backColor', 'foreColor', 'fontName'];
  
      for (var idx = 0, len = commands.length; idx < len; idx ++) {
        this[commands[idx]] = (function (sCmd) {
          return function (value) {
            beforeCommand();
            document.execCommand(sCmd, false, value);
            afterCommand(true);
          };
        })(commands[idx]);
        context.memo('help.' + commands[idx], lang.help[commands[idx]]);
      }
      /* jshint ignore:end */
  
      /**
       * handle tab key
       */
      this.tab = function () {
        var rng = this.createRange();
        if (rng.isCollapsed() && rng.isOnCell()) {
          table.tab(rng);
        } else {
          beforeCommand();
          typing.insertTab(rng, options.tabSize);
          afterCommand();
        }
      };
      context.memo('help.tab', lang.help.tab);
  
      /**
       * handle shift+tab key
       */
      this.untab = function () {
        var rng = this.createRange();
        if (rng.isCollapsed() && rng.isOnCell()) {
          table.tab(rng, true);
        }
      };
      context.memo('help.untab', lang.help.untab);
  
      /**
       * run given function between beforeCommand and afterCommand
       */
      this.wrapCommand = function (fn) {
        return function () {
          beforeCommand();
          fn.apply(self, arguments);
          afterCommand();
        };
      };
  
      /**
       * insert paragraph
       */
      this.insertParagraph = this.wrapCommand(function () {
        typing.insertParagraph(editable);
      });
      context.memo('help.insertParagraph', lang.help.insertParagraph);
  
      this.insertOrderedList = this.wrapCommand(function () {
        bullet.insertOrderedList(editable);
      });
      context.memo('help.insertOrderedList', lang.help.insertOrderedList);
  
      this.insertUnorderedList = this.wrapCommand(function () {
        bullet.insertUnorderedList(editable);
      });
      context.memo('help.insertUnorderedList', lang.help.insertUnorderedList);
  
      this.indent = this.wrapCommand(function () {
        bullet.indent(editable);
      });
      context.memo('help.indent', lang.help.indent);
  
      this.outdent = this.wrapCommand(function () {
        bullet.outdent(editable);
      });
      context.memo('help.outdent', lang.help.outdent);
  
      /**
       * insert image
       *
       * @param {String} src
       * @param {String|Function} param
       * @return {Promise}
       */
      this.insertImage = function (src, param) {
        return async.createImage(src, param).then(function ($image) {
          beforeCommand();
  
          if (typeof param === 'function') {
            param($image);
          } else {
            if (typeof param === 'string') {
              $image.attr('data-filename', param);
            }
            $image.css('width', Math.min($editable.width(), $image.width()));
          }
  
          $image.show();
          range.create(editable).insertNode($image[0]);
          range.createFromNodeAfter($image[0]).select();
          afterCommand();
        }).fail(function (e) {
          context.triggerEvent('image.upload.error', e);
        });
      };
  
      /**
       * insertImages
       * @param {File[]} files
       */
      this.insertImages = function (files) {
        $.each(files, function (idx, file) {
          var filename = file.name;
          if (options.maximumImageFileSize && options.maximumImageFileSize < file.size) {
            context.triggerEvent('image.upload.error', lang.image.maximumFileSizeError);
          } else {
            async.readFileAsDataURL(file).then(function (dataURL) {
              return self.insertImage(dataURL, filename);
            }).fail(function () {
              context.triggerEvent('image.upload.error');
            });
          }
        });
      };
  
      /**
       * insertImagesOrCallback
       * @param {File[]} files
       */
      this.insertImagesOrCallback = function (files) {
        var callbacks = options.callbacks;
  
        // If onImageUpload options setted
        if (callbacks.onImageUpload) {
          context.triggerEvent('image.upload', files);
        // else insert Image as dataURL
        } else {
          this.insertImages(files);
        }
      };
  
      /**
       * insertNode
       * insert node
       * @param {Node} node
       */
      this.insertNode = this.wrapCommand(function (node) {
        var rng = this.createRange();
        rng.insertNode(node);
        range.createFromNodeAfter(node).select();
      });
  
      /**
       * insert text
       * @param {String} text
       */
      this.insertText = this.wrapCommand(function (text) {
        var rng = this.createRange();
        var textNode = rng.insertNode(dom.createText(text));
        range.create(textNode, dom.nodeLength(textNode)).select();
      });
  
      /**
       * return selected plain text
       * @return {String} text
       */
      this.getSelectedText = function () {
        var rng = this.createRange();
  
        // if range on anchor, expand range with anchor
        if (rng.isOnAnchor()) {
          rng = range.createFromNode(dom.ancestor(rng.sc, dom.isAnchor));
        }
  
        return rng.toString();
      };
  
      /**
       * paste HTML
       * @param {String} markup
       */
      this.pasteHTML = this.wrapCommand(function (markup) {
        var contents = this.createRange().pasteHTML(markup);
        range.createFromNodeAfter(list.last(contents)).select();
      });
  
      /**
       * formatBlock
       *
       * @param {String} tagName
       */
      this.formatBlock = this.wrapCommand(function (tagName) {
        // [workaround] for MSIE, IE need `<`
        tagName = agent.isMSIE ? '<' + tagName + '>' : tagName;
        document.execCommand('FormatBlock', false, tagName);
      });
  
      this.formatPara = function () {
        this.formatBlock('P');
      };
      context.memo('help.formatPara', lang.help.formatPara);
  
      /* jshint ignore:start */
      for (var idx = 1; idx <= 6; idx ++) {
        this['formatH' + idx] = function (idx) {
          return function () {
            this.formatBlock('H' + idx);
          };
        }(idx);
        context.memo('help.formatH'+idx, lang.help['formatH' + idx]);
      };
      /* jshint ignore:end */
  
      /**
       * fontSize
       *
       * @param {String} value - px
       */
      this.fontSize = function (value) {
        var rng = this.createRange();
  
        if (rng && rng.isCollapsed()) {
          var spans = style.styleNodes(rng);
          var firstSpan = list.head(spans);
  
          $(spans).css({
            'font-size': value + 'px'
          });
  
          // [workaround] added styled bogus span for style
          //  - also bogus character needed for cursor position
          if (firstSpan && !dom.nodeLength(firstSpan)) {
            firstSpan.innerHTML = dom.ZERO_WIDTH_NBSP_CHAR;
            range.createFromNodeAfter(firstSpan.firstChild).select();
            $editable.data(KEY_BOGUS, firstSpan);
          }
        } else {
          beforeCommand();
          $(style.styleNodes(rng)).css({
            'font-size': value + 'px'
          });
          afterCommand();
        }
      };
  
      /**
       * insert horizontal rule
       */
      this.insertHorizontalRule = this.wrapCommand(function () {
        var hrNode = this.createRange().insertNode(dom.create('HR'));
        if (hrNode.nextSibling) {
          range.create(hrNode.nextSibling, 0).normalize().select();
        }
      });
      context.memo('help.insertHorizontalRule', lang.help.insertHorizontalRule);
  
      /**
       * remove bogus node and character
       */
      this.removeBogus = function () {
        var bogusNode = $editable.data(KEY_BOGUS);
        if (!bogusNode) {
          return;
        }
  
        var textNode = list.find(list.from(bogusNode.childNodes), dom.isText);
  
        var bogusCharIdx = textNode.nodeValue.indexOf(dom.ZERO_WIDTH_NBSP_CHAR);
        if (bogusCharIdx !== -1) {
          textNode.deleteData(bogusCharIdx, 1);
        }
  
        if (dom.isEmpty(bogusNode)) {
          dom.remove(bogusNode);
        }
  
        $editable.removeData(KEY_BOGUS);
      };
  
      /**
       * lineHeight
       * @param {String} value
       */
      this.lineHeight = this.wrapCommand(function (value) {
        style.stylePara(this.createRange(), {
          lineHeight: value
        });
      });
  
      /**
       * unlink
       *
       * @type command
       */
      this.unlink = function () {
        var rng = this.createRange();
        if (rng.isOnAnchor()) {
          var anchor = dom.ancestor(rng.sc, dom.isAnchor);
          rng = range.createFromNode(anchor);
          rng.select();
  
          beforeCommand();
          document.execCommand('unlink');
          afterCommand();
        }
      };
  
      /**
       * create link (command)
       *
       * @param {Object} linkInfo
       */
      this.createLink = this.wrapCommand(function (linkInfo) {
        var linkUrl = linkInfo.url;
        var linkText = linkInfo.text;
        var isNewWindow = linkInfo.isNewWindow;
        var rng = linkInfo.range || this.createRange();
        var isTextChanged = rng.toString() !== linkText;
  
        if (options.onCreateLink) {
          linkUrl = options.onCreateLink(linkUrl);
        }
  
        var anchors = [];
        if (isTextChanged) {
          rng = rng.deleteContents();
          var anchor = rng.insertNode($('<A>' + linkText + '</A>')[0]);
          anchors.push(anchor);
        } else {
          anchors = style.styleNodes(rng, {
            nodeName: 'A',
            expandClosestSibling: true,
            onlyPartialContains: true
          });
        }
  
        $.each(anchors, function (idx, anchor) {
          $(anchor).attr('href', linkUrl);
          if (isNewWindow) {
            $(anchor).attr('target', '_blank');
          } else {
            $(anchor).removeAttr('target');
          }
        });
  
        var startRange = range.createFromNodeBefore(list.head(anchors));
        var startPoint = startRange.getStartPoint();
        var endRange = range.createFromNodeAfter(list.last(anchors));
        var endPoint = endRange.getEndPoint();
  
        range.create(
          startPoint.node,
          startPoint.offset,
          endPoint.node,
          endPoint.offset
        ).select();
      });
  
      /**
       * returns link info
       *
       * @return {Object}
       * @return {WrappedRange} return.range
       * @return {String} return.text
       * @return {Boolean} [return.isNewWindow=true]
       * @return {String} [return.url=""]
       */
      this.getLinkInfo = function () {
        var rng = this.createRange().expand(dom.isAnchor);
  
        // Get the first anchor on range(for edit).
        var $anchor = $(list.head(rng.nodes(dom.isAnchor)));
  
        return {
          range: rng,
          text: rng.toString(),
          isNewWindow: $anchor.length ? $anchor.attr('target') === '_blank' : false,
          url: $anchor.length ? $anchor.attr('href') : ''
        };
      };
  
      /**
       * setting color
       *
       * @param {Object} sObjColor  color code
       * @param {String} sObjColor.foreColor foreground color
       * @param {String} sObjColor.backColor background color
       */
      this.color = this.wrapCommand(function (colorInfo) {
        var foreColor = colorInfo.foreColor;
        var backColor = colorInfo.backColor;
  
        if (foreColor) { document.execCommand('foreColor', false, foreColor); }
        if (backColor) { document.execCommand('backColor', false, backColor); }
      });
  
      /**
       * insert Table
       *
       * @param {String} dimension of table (ex : "5x5")
       */
      this.insertTable = this.wrapCommand(function (dim) {
        var dimension = dim.split('x');
  
        var rng = this.createRange().deleteContents();
        rng.insertNode(table.createTable(dimension[0], dimension[1], options));
      });
  
      /**
       * float me
       *
       * @param {String} value
       */
      this.floatMe = this.wrapCommand(function (value) {
        var $target = $(this.restoreTarget());
        $target.css('float', value);
      });
  
      /**
       * resize overlay element
       * @param {String} value
       */
      this.resize = this.wrapCommand(function (value) {
        var $target = $(this.restoreTarget());
        $target.css({
          width: value * 100 + '%',
          height: ''
        });
      });
  
      /**
       * @param {Position} pos
       * @param {jQuery} $target - target element
       * @param {Boolean} [bKeepRatio] - keep ratio
       */
      this.resizeTo = function (pos, $target, bKeepRatio) {
        var imageSize;
        if (bKeepRatio) {
          var newRatio = pos.y / pos.x;
          var ratio = $target.data('ratio');
          imageSize = {
            width: ratio > newRatio ? pos.x : pos.y / ratio,
            height: ratio > newRatio ? pos.x * ratio : pos.y
          };
        } else {
          imageSize = {
            width: pos.x,
            height: pos.y
          };
        }
  
        $target.css(imageSize);
      };
  
      /**
       * remove media object
       */
      this.removeMedia = this.wrapCommand(function () {
        var $target = $(this.restoreTarget()).detach();
        context.triggerEvent('media.delete', $target, $editable);
      });
  
      /**
       * returns whether editable area has focus or not.
       */
      this.hasFocus = function () {
        return $editable.is(':focus');
      };
  
      /**
       * set focus
       */
      this.focus = function () {
        // [workaround] Screen will move when page is scolled in IE.
        //  - do focus when not focused
        if (!this.hasFocus()) {
          $editable.focus();
        }
      };
  
      /**
       * returns whether contents is empty or not.
       * @return {Boolean}
       */
      this.isEmpty = function () {
        return dom.isEmpty($editable[0]) || dom.emptyPara === $editable.html();
      };
  
      /**
       * Removes all contents and restores the editable instance to an _emptyPara_.
       */
      this.empty = function () {
        context.invoke('code', dom.emptyPara);
      };
  
      /**
       * set height for editable
       */
      this.setHeight = function (height) {
        $editable.outerHeight(height);
      };
    };
  
    var Clipboard = function (context) {
      var self = this;
  
      var $editable = context.layoutInfo.editable;
  
      this.events = {
        'summernote.keydown': function (we, e) {
          if (self.needKeydownHook()) {
            if ((e.ctrlKey || e.metaKey) && e.keyCode === key.code.V) {
              context.invoke('editor.saveRange');
              self.$paste.focus();
  
              setTimeout(function () {
                self.pasteByHook();
              }, 0);
            }
          }
        }
      };
  
      this.needKeydownHook = function () {
        return (agent.isMSIE && agent.browserVersion > 10) || agent.isFF;
      };
  
      this.initialize = function () {
        // [workaround] getting image from clipboard
        //  - IE11 and Firefox: CTRL+v hook
        //  - Webkit: event.clipboardData
        if (this.needKeydownHook()) {
          this.$paste = $('<div />').attr('contenteditable', true).css({
            position: 'absolute',
            left: -100000,
            opacity: 0
          });
          $editable.before(this.$paste);
  
          this.$paste.on('paste', function (event) {
            context.triggerEvent('paste', event);
          });
        } else {
          $editable.on('paste', this.pasteByEvent);
        }
      };
  
      this.destroy = function () {
        if (this.needKeydownHook()) {
          this.$paste.remove();
          this.$paste = null;
        }
      };
  
      this.pasteByHook = function () {
        var node = this.$paste[0].firstChild;
  
        if (dom.isImg(node)) {
          var dataURI = node.src;
          var decodedData = atob(dataURI.split(',')[1]);
          var array = new Uint8Array(decodedData.length);
          for (var i = 0; i < decodedData.length; i++) {
            array[i] = decodedData.charCodeAt(i);
          }
  
          var blob = new Blob([array], { type: 'image/png' });
          blob.name = 'clipboard.png';
  
          context.invoke('editor.restoreRange');
          context.invoke('editor.focus');
          context.invoke('editor.insertImagesOrCallback', [blob]);
        } else {
          var pasteContent = $('<div />').html(this.$paste.html()).html();
          context.invoke('editor.restoreRange');
          context.invoke('editor.focus');
  
          if (pasteContent) {
            context.invoke('editor.pasteHTML', pasteContent);
          }
        }
  
        this.$paste.empty();
      };
  
      /**
       * paste by clipboard event
       *
       * @param {Event} event
       */
      this.pasteByEvent = function (event) {
        var clipboardData = event.originalEvent.clipboardData;
        if (clipboardData && clipboardData.items && clipboardData.items.length) {
          var item = list.head(clipboardData.items);
          if (item.kind === 'file' && item.type.indexOf('image/') !== -1) {
            context.invoke('editor.insertImagesOrCallback', [item.getAsFile()]);
          }
          context.invoke('editor.afterCommand');
        }
      };
    };
  
    var Dropzone = function (context) {
      var $document = $(document);
      var $editor = context.layoutInfo.editor;
      var $editable = context.layoutInfo.editable;
      var options = context.options;
      var lang = options.langInfo;
  
      var $dropzone = $([
        '<div class="note-dropzone">',
        '  <div class="note-dropzone-message"/>',
        '</div>'
      ].join('')).prependTo($editor);
  
      /**
       * attach Drag and Drop Events
       */
      this.initialize = function () {
        if (options.disableDragAndDrop) {
          // prevent default drop event
          $document.on('drop', function (e) {
            e.preventDefault();
          });
        } else {
          this.attachDragAndDropEvent();
        }
      };
  
      /**
       * attach Drag and Drop Events
       */
      this.attachDragAndDropEvent = function () {
        var collection = $(),
            $dropzoneMessage = $dropzone.find('.note-dropzone-message');
  
        // show dropzone on dragenter when dragging a object to document
        // -but only if the editor is visible, i.e. has a positive width and height
        $document.on('dragenter', function (e) {
          var isCodeview = context.invoke('codeview.isActivated');
          var hasEditorSize = $editor.width() > 0 && $editor.height() > 0;
          if (!isCodeview && !collection.length && hasEditorSize) {
            $editor.addClass('dragover');
            $dropzone.width($editor.width());
            $dropzone.height($editor.height());
            $dropzoneMessage.text(lang.image.dragImageHere);
          }
          collection = collection.add(e.target);
        }).on('dragleave', function (e) {
          collection = collection.not(e.target);
          if (!collection.length) {
            $editor.removeClass('dragover');
          }
        }).on('drop', function () {
          collection = $();
          $editor.removeClass('dragover');
        });
  
        // change dropzone's message on hover.
        $dropzone.on('dragenter', function () {
          $dropzone.addClass('hover');
          $dropzoneMessage.text(lang.image.dropImage);
        }).on('dragleave', function () {
          $dropzone.removeClass('hover');
          $dropzoneMessage.text(lang.image.dragImageHere);
        });
  
        // attach dropImage
        $dropzone.on('drop', function (event) {
          var dataTransfer = event.originalEvent.dataTransfer;
  
          if (dataTransfer && dataTransfer.files && dataTransfer.files.length) {
            event.preventDefault();
            $editable.focus();
            context.invoke('editor.insertImagesOrCallback', dataTransfer.files);
          } else {
            $.each(dataTransfer.types, function (idx, type) {
              var content = dataTransfer.getData(type);
  
              if (type.toLowerCase().indexOf('text') > -1) {
                context.invoke('editor.pasteHTML', content);
              } else {
                $(content).each(function () {
                  context.invoke('editor.insertNode', this);
                });
              }
            });
          }
        }).on('dragover', false); // prevent default dragover event
      };
    };
  
  
    var CodeMirror;
    if (agent.hasCodeMirror) {
      if (agent.isSupportAmd) {
        require(['codemirror'], function (cm) {
          CodeMirror = cm;
        });
      } else {
        CodeMirror = window.CodeMirror;
      }
    }
  
    /**
     * @class Codeview
     */
    var Codeview = function (context) {
      var $editor = context.layoutInfo.editor;
      var $editable = context.layoutInfo.editable;
      var $codable = context.layoutInfo.codable;
      var options = context.options;
  
      this.sync = function () {
        var isCodeview = this.isActivated();
        if (isCodeview && agent.hasCodeMirror) {
          $codable.data('cmEditor').save();
        }
      };
  
      /**
       * @return {Boolean}
       */
      this.isActivated = function () {
        return $editor.hasClass('codeview');
      };
  
      /**
       * toggle codeview
       */
      this.toggle = function () {
        if (this.isActivated()) {
          this.deactivate();
        } else {
          this.activate();
        }
        context.triggerEvent('codeview.toggled');
      };
  
      /**
       * activate code view
       */
      this.activate = function () {
        $codable.val(dom.html($editable, options.prettifyHtml));
        $codable.height($editable.height());
  
        context.invoke('toolbar.updateCodeview', true);
        $editor.addClass('codeview');
        $codable.focus();
  
        // activate CodeMirror as codable
        if (agent.hasCodeMirror) {
          var cmEditor = CodeMirror.fromTextArea($codable[0], options.codemirror);
  
          // CodeMirror TernServer
          if (options.codemirror.tern) {
            var server = new CodeMirror.TernServer(options.codemirror.tern);
            cmEditor.ternServer = server;
            cmEditor.on('cursorActivity', function (cm) {
              server.updateArgHints(cm);
            });
          }
  
          // CodeMirror hasn't Padding.
          cmEditor.setSize(null, $editable.outerHeight());
          $codable.data('cmEditor', cmEditor);
        }
      };
  
      /**
       * deactivate code view
       */
      this.deactivate = function () {
        // deactivate CodeMirror as codable
        if (agent.hasCodeMirror) {
          var cmEditor = $codable.data('cmEditor');
          $codable.val(cmEditor.getValue());
          cmEditor.toTextArea();
        }
  
        var value = dom.value($codable, options.prettifyHtml) || dom.emptyPara;
        var isChange = $editable.html() !== value;
  
        $editable.html(value);
        $editable.height(options.height ? $codable.height() : 'auto');
        $editor.removeClass('codeview');
  
        if (isChange) {
          context.triggerEvent('change', $editable.html(), $editable);
        }
  
        $editable.focus();
  
        context.invoke('toolbar.updateCodeview', false);
      };
  
      this.destroy = function () {
        if (this.isActivated()) {
          this.deactivate();
        }
      };
    };
  
    var EDITABLE_PADDING = 24;
  
    var Statusbar = function (context) {
      var $document = $(document);
      var $statusbar = context.layoutInfo.statusbar;
      var $editable = context.layoutInfo.editable;
      var options = context.options;
  
      this.initialize = function () {
        if (options.airMode || options.disableResizeEditor) {
          return;
        }
  
        $statusbar.on('mousedown', function (event) {
          event.preventDefault();
          event.stopPropagation();
  
          var editableTop = $editable.offset().top - $document.scrollTop();
  
          $document.on('mousemove', function (event) {
            var height = event.clientY - (editableTop + EDITABLE_PADDING);
  
            height = (options.minheight > 0) ? Math.max(height, options.minheight) : height;
            height = (options.maxHeight > 0) ? Math.min(height, options.maxHeight) : height;
  
            $editable.height(height);
          }).one('mouseup', function () {
            $document.off('mousemove');
          });
        });
      };
  
      this.destroy = function () {
        $statusbar.off();
      };
    };
  
    var Fullscreen = function (context) {
      var $editor = context.layoutInfo.editor;
      var $toolbar = context.layoutInfo.toolbar;
      var $editable = context.layoutInfo.editable;
      var $codable = context.layoutInfo.codable;
  
      var $window = $(window);
      var $scrollbar = $('html, body');
  
      /**
       * toggle fullscreen
       */
      this.toggle = function () {
        var resize = function (size) {
          $editable.css('height', size.h);
          $codable.css('height', size.h);
          if ($codable.data('cmeditor')) {
            $codable.data('cmeditor').setsize(null, size.h);
          }
        };
  
        $editor.toggleClass('fullscreen');
        if (this.isFullscreen()) {
          $editable.data('orgHeight', $editable.css('height'));
  
          $window.on('resize', function () {
            resize({
              h: $window.height() - $toolbar.outerHeight()
            });
          }).trigger('resize');
  
          $scrollbar.css('overflow', 'hidden');
        } else {
          $window.off('resize');
          resize({
            h: $editable.data('orgHeight')
          });
          $scrollbar.css('overflow', 'visible');
        }
  
        context.invoke('toolbar.updateFullscreen', this.isFullscreen());
      };
  
      this.isFullscreen = function () {
        return $editor.hasClass('fullscreen');
      };
    };
  
    var Handle = function (context) {
      var self = this;
  
      var $document = $(document);
      var $editingArea = context.layoutInfo.editingArea;
      var options = context.options;
  
      this.events = {
        'summernote.mousedown': function (we, e) {
          if (self.update(e.target)) {
            e.preventDefault();
          }
        },
        'summernote.keyup summernote.scroll summernote.change summernote.dialog.shown': function () {
          self.update();
        }
      };
  
      this.initialize = function () {
        this.$handle = $([
          '<div class="note-handle">',
          '<div class="note-control-selection">',
          '<div class="note-control-selection-bg"></div>',
          '<div class="note-control-holder note-control-nw"></div>',
          '<div class="note-control-holder note-control-ne"></div>',
          '<div class="note-control-holder note-control-sw"></div>',
          '<div class="',
          (options.disableResizeImage ? 'note-control-holder' : 'note-control-sizing'),
          ' note-control-se"></div>',
          (options.disableResizeImage ? '' : '<div class="note-control-selection-info"></div>'),
          '</div>',
          '</div>'
        ].join('')).prependTo($editingArea);
  
        this.$handle.on('mousedown', function (event) {
          if (dom.isControlSizing(event.target)) {
            event.preventDefault();
            event.stopPropagation();
  
            var $target = self.$handle.find('.note-control-selection').data('target'),
                posStart = $target.offset(),
                scrollTop = $document.scrollTop();
  
            $document.on('mousemove', function (event) {
              context.invoke('editor.resizeTo', {
                x: event.clientX - posStart.left,
                y: event.clientY - (posStart.top - scrollTop)
              }, $target, !event.shiftKey);
  
              self.update($target[0]);
            }).one('mouseup', function (e) {
              e.preventDefault();
              $document.off('mousemove');
              context.invoke('editor.afterCommand');
            });
  
            if (!$target.data('ratio')) { // original ratio.
              $target.data('ratio', $target.height() / $target.width());
            }
          }
        });
      };
  
      this.destroy = function () {
        this.$handle.remove();
      };
  
      this.update = function (target) {
        var isImage = dom.isImg(target);
        var $selection = this.$handle.find('.note-control-selection');
  
        context.invoke('imagePopover.update', target);
  
        if (isImage) {
          var $image = $(target);
          var pos = $image.position();
  
          // include margin
          var imageSize = {
            w: $image.outerWidth(true),
            h: $image.outerHeight(true)
          };
  
          $selection.css({
            display: 'block',
            left: pos.left,
            top: pos.top,
            width: imageSize.w,
            height: imageSize.h
          }).data('target', $image); // save current image element.
  
          var sizingText = imageSize.w + 'x' + imageSize.h;
          $selection.find('.note-control-selection-info').text(sizingText);
          context.invoke('editor.saveTarget', target);
        } else {
          this.hide();
        }
  
        return isImage;
      };
  
      /**
       * hide
       *
       * @param {jQuery} $handle
       */
      this.hide = function () {
        context.invoke('editor.clearTarget');
        this.$handle.children().hide();
      };
    };
  
    var AutoLink = function (context) {
      var self = this;
      var defaultScheme = 'http://';
      var linkPattern = /^(https?:\/\/|ssh:\/\/|ftp:\/\/|file:\/|mailto:[A-Z0-9._%+-]+@)?(www\.)?(.+)$/i;
  
      this.events = {
        'summernote.keyup': function (we, e) {
          if (!e.isDefaultPrevented()) {
            self.handleKeyup(e);
          }
        },
        'summernote.keydown': function (we, e) {
          self.handleKeydown(e);
        }
      };
  
      this.initialize = function () {
        this.lastWordRange = null;
      };
  
      this.destroy = function () {
        this.lastWordRange = null;
      };
  
      this.replace = function () {
        if (!this.lastWordRange) {
          return;
        }
  
        var keyword = this.lastWordRange.toString();
        var match = keyword.match(linkPattern);
  
        if (match && (match[1] || match[2])) {
          var link = match[1] ? keyword : defaultScheme + keyword;
          var node = $('<a />').html(keyword).attr('href', link)[0];
  
          this.lastWordRange.insertNode(node);
          this.lastWordRange = null;
          context.invoke('editor.focus');
        }
  
      };
  
      this.handleKeydown = function (e) {
        if (list.contains([key.code.ENTER, key.code.SPACE], e.keyCode)) {
          var wordRange = context.invoke('editor.createRange').getWordRange();
          this.lastWordRange = wordRange;
        }
      };
  
      this.handleKeyup = function (e) {
        if (list.contains([key.code.ENTER, key.code.SPACE], e.keyCode)) {
          this.replace();
        }
      };
    };
  
    /**
     * textarea auto sync.
     */
    var AutoSync = function (context) {
      var $note = context.layoutInfo.note;
  
      this.events = {
        'summernote.change': function () {
          $note.val(context.invoke('code'));
        }
      };
  
      this.shouldInitialize = function () {
        return dom.isTextarea($note[0]);
      };
    };
  
    var Placeholder = function (context) {
      var self = this;
      var $editingArea = context.layoutInfo.editingArea;
      var options = context.options;
  
      this.events = {
        'summernote.init summernote.change': function () {
          self.update();
        },
        'summernote.codeview.toggled': function () {
          self.update();
        }
      };
  
      this.shouldInitialize = function () {
        return !!options.placeholder;
      };
  
      this.initialize = function () {
        this.$placeholder = $('<div class="note-placeholder">');
        this.$placeholder.on('click', function () {
          context.invoke('focus');
        }).text(options.placeholder).prependTo($editingArea);
      };
  
      this.destroy = function () {
        this.$placeholder.remove();
      };
  
      this.update = function () {
        var isShow = !context.invoke('codeview.isActivated') && context.invoke('editor.isEmpty');
        this.$placeholder.toggle(isShow);
      };
    };
  
    var Buttons = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var $toolbar = context.layoutInfo.toolbar;
      var options = context.options;
      var lang = options.langInfo;
  
      var invertedKeyMap = func.invertObject(options.keyMap[agent.isMac ? 'mac' : 'pc']);
  
      var representShortcut = this.representShortcut = function (editorMethod) {
        var shortcut = invertedKeyMap[editorMethod];
        if (agent.isMac) {
          shortcut = shortcut.replace('CMD', '⌘').replace('SHIFT', '⇧');
        }
  
        shortcut = shortcut.replace('BACKSLASH', '\\')
                           .replace('SLASH', '/')
                           .replace('LEFTBRACKET', '[')
                           .replace('RIGHTBRACKET', ']');
  
        return ' (' + shortcut + ')';
      };
  
      this.initialize = function () {
        this.addToolbarButtons();
        this.addImagePopoverButtons();
        this.addLinkPopoverButtons();
        this.fontInstalledMap = {};
      };
  
      this.destroy = function () {
        delete this.fontInstalledMap;
      };
  
      this.isFontInstalled = function (name) {
        if (!self.fontInstalledMap.hasOwnProperty(name)) {
          self.fontInstalledMap[name] = agent.isFontInstalled(name) ||
            list.contains(options.fontNamesIgnoreCheck, name);
        }
  
        return self.fontInstalledMap[name];
      };
  
      this.addToolbarButtons = function () {
        context.memo('button.style', function () {
          return ui.buttonGroup([
            ui.button({
              className: 'dropdown-toggle',
              contents: ui.icon(options.icons.magic) + ' ' + ui.icon(options.icons.caret, 'span'),
              tooltip: lang.style.style,
              data: {
                toggle: 'dropdown'
              }
            }),
            ui.dropdown({
              className: 'dropdown-style',
              items: context.options.styleTags,
              template: function (item) {
  
                if (typeof item === 'string') {
                  item = { tag: item, title: item };
                }
  
                var tag = item.tag;
                var title = item.title;
                var style = item.style ? ' style="' + item.style + '" ' : '';
                var className = item.className ? ' className="' + item.className + '"' : '';
  
                return '<' + tag + style + className + '>' + title + '</' + tag +  '>';
              },
              click: context.createInvokeHandler('editor.formatBlock')
            })
          ]).render();
        });
  
        context.memo('button.bold', function () {
          return ui.button({
            className: 'note-btn-bold',
            contents: ui.icon(options.icons.bold),
            tooltip: lang.font.bold + representShortcut('bold'),
            click: context.createInvokeHandler('editor.bold')
          }).render();
        });
  
        context.memo('button.italic', function () {
          return ui.button({
            className: 'note-btn-italic',
            contents: ui.icon(options.icons.italic),
            tooltip: lang.font.italic + representShortcut('italic'),
            click: context.createInvokeHandler('editor.italic')
          }).render();
        });
  
        context.memo('button.underline', function () {
          return ui.button({
            className: 'note-btn-underline',
            contents: ui.icon(options.icons.underline),
            tooltip: lang.font.underline + representShortcut('underline'),
            click: context.createInvokeHandler('editor.underline')
          }).render();
        });
  
        context.memo('button.clear', function () {
          return ui.button({
            contents: ui.icon(options.icons.eraser),
            tooltip: lang.font.clear + representShortcut('removeFormat'),
            click: context.createInvokeHandler('editor.removeFormat')
          }).render();
        });
  
        context.memo('button.strikethrough', function () {
          return ui.button({
            className: 'note-btn-strikethrough',
            contents: ui.icon(options.icons.strikethrough),
            tooltip: lang.font.strikethrough + representShortcut('strikethrough'),
            click: context.createInvokeHandler('editor.strikethrough')
          }).render();
        });
  
        context.memo('button.superscript', function () {
          return ui.button({
            className: 'note-btn-superscript',
            contents: ui.icon(options.icons.superscript),
            tooltip: lang.font.superscript,
            click: context.createInvokeHandler('editor.superscript')
          }).render();
        });
  
        context.memo('button.subscript', function () {
          return ui.button({
            className: 'note-btn-subscript',
            contents: ui.icon(options.icons.subscript),
            tooltip: lang.font.subscript,
            click: context.createInvokeHandler('editor.subscript')
          }).render();
        });
  
        context.memo('button.fontname', function () {
          return ui.buttonGroup([
            ui.button({
              className: 'dropdown-toggle',
              contents: '<span class="note-current-fontname"/> ' + ui.icon(options.icons.caret, 'span'),
              tooltip: lang.font.name,
              data: {
                toggle: 'dropdown'
              }
            }),
            ui.dropdownCheck({
              className: 'dropdown-fontname',
              checkClassName: options.icons.menuCheck,
              items: options.fontNames.filter(self.isFontInstalled),
              template: function (item) {
                return '<span style="font-family:' + item + '">' + item + '</span>';
              },
              click: context.createInvokeHandler('editor.fontName')
            })
          ]).render();
        });
  
        context.memo('button.fontsize', function () {
          return ui.buttonGroup([
            ui.button({
              className: 'dropdown-toggle',
              contents: '<span class="note-current-fontsize"/>' + ui.icon(options.icons.caret, 'span'),
              tooltip: lang.font.size,
              data: {
                toggle: 'dropdown'
              }
            }),
            ui.dropdownCheck({
              className: 'dropdown-fontsize',
              checkClassName: options.icons.menuCheck,
              items: options.fontSizes,
              click: context.createInvokeHandler('editor.fontSize')
            })
          ]).render();
        });
  
        context.memo('button.color', function () {
          return ui.buttonGroup({
            className: 'note-color',
            children: [
              ui.button({
                className: 'note-current-color-button',
                contents: ui.icon(options.icons.font + ' note-recent-color'),
                tooltip: lang.color.recent,
                click: function (e) {
                  var $button = $(e.currentTarget);
                  context.invoke('editor.color', {
                    backColor: $button.attr('data-backColor'),
                    foreColor: $button.attr('data-foreColor')
                  });
                },
                callback: function ($button) {
                  var $recentColor = $button.find('.note-recent-color');
                  $recentColor.css('background-color', '#FFFF00');
                  $button.attr('data-backColor', '#FFFF00');
                }
              }),
              ui.button({
                className: 'dropdown-toggle',
                contents: ui.icon(options.icons.caret, 'span'),
                tooltip: lang.color.more,
                data: {
                  toggle: 'dropdown'
                }
              }),
              ui.dropdown({
                items: [
                  '<li>',
                  '<div class="btn-group">',
                  '  <div class="note-palette-title">' + lang.color.background + '</div>',
                  '  <div>',
                  '    <button type="button" class="note-color-reset btn btn-default" data-event="backColor" data-value="inherit">',
                  lang.color.transparent,
                  '    </button>',
                  '  </div>',
                  '  <div class="note-holder" data-event="backColor"/>',
                  '</div>',
                  '<div class="btn-group">',
                  '  <div class="note-palette-title">' + lang.color.foreground + '</div>',
                  '  <div>',
                  '    <button type="button" class="note-color-reset btn btn-default" data-event="removeFormat" data-value="foreColor">',
                  lang.color.resetToDefault,
                  '    </button>',
                  '  </div>',
                  '  <div class="note-holder" data-event="foreColor"/>',
                  '</div>',
                  '</li>'
                ].join(''),
                callback: function ($dropdown) {
                  $dropdown.find('.note-holder').each(function () {
                    var $holder = $(this);
                    $holder.append(ui.palette({
                      colors: options.colors,
                      eventName: $holder.data('event')
                    }).render());
                  });
                },
                click: function (event) {
                  var $button = $(event.target);
                  var eventName = $button.data('event');
                  var value = $button.data('value');
  
                  if (eventName && value) {
                    var key = eventName === 'backColor' ? 'background-color' : 'color';
                    var $color = $button.closest('.note-color').find('.note-recent-color');
                    var $currentButton = $button.closest('.note-color').find('.note-current-color-button');
  
                    $color.css(key, value);
                    $currentButton.attr('data-' + eventName, value);
                    context.invoke('editor.' + eventName, value);
                  }
                }
              })
            ]
          }).render();
        });
  
        context.memo('button.ul',  function () {
          return ui.button({
            contents: ui.icon(options.icons.unorderedlist),
            tooltip: lang.lists.unordered + representShortcut('insertUnorderedList'),
            click: context.createInvokeHandler('editor.insertUnorderedList')
          }).render();
        });
  
        context.memo('button.ol', function () {
          return ui.button({
            contents: ui.icon(options.icons.orderedlist),
            tooltip: lang.lists.ordered + representShortcut('insertOrderedList'),
            click:  context.createInvokeHandler('editor.insertOrderedList')
          }).render();
        });
  
        var justifyLeft = ui.button({
          contents: ui.icon(options.icons.alignLeft),
          tooltip: lang.paragraph.left + representShortcut('justifyLeft'),
          click: context.createInvokeHandler('editor.justifyLeft')
        });
  
        var justifyCenter = ui.button({
          contents: ui.icon(options.icons.alignCenter),
          tooltip: lang.paragraph.center + representShortcut('justifyCenter'),
          click: context.createInvokeHandler('editor.justifyCenter')
        });
  
        var justifyRight = ui.button({
          contents: ui.icon(options.icons.alignRight),
          tooltip: lang.paragraph.right + representShortcut('justifyRight'),
          click: context.createInvokeHandler('editor.justifyRight')
        });
  
        var justifyFull = ui.button({
          contents: ui.icon(options.icons.alignJustify),
          tooltip: lang.paragraph.justify + representShortcut('justifyFull'),
          click: context.createInvokeHandler('editor.justifyFull')
        });
  
        var outdent = ui.button({
          contents: ui.icon(options.icons.outdent),
          tooltip: lang.paragraph.outdent + representShortcut('outdent'),
          click: context.createInvokeHandler('editor.outdent')
        });
  
        var indent = ui.button({
          contents: ui.icon(options.icons.indent),
          tooltip: lang.paragraph.indent + representShortcut('indent'),
          click: context.createInvokeHandler('editor.indent')
        });
  
        context.memo('button.justifyLeft', func.invoke(justifyLeft, 'render'));
        context.memo('button.justifyCenter', func.invoke(justifyCenter, 'render'));
        context.memo('button.justifyRight', func.invoke(justifyRight, 'render'));
        context.memo('button.justifyFull', func.invoke(justifyFull, 'render'));
        context.memo('button.outdent', func.invoke(outdent, 'render'));
        context.memo('button.indent', func.invoke(indent, 'render'));
  
        context.memo('button.paragraph', function () {
          return ui.buttonGroup([
            ui.button({
              className: 'dropdown-toggle',
              contents: ui.icon(options.icons.alignLeft) + ' ' + ui.icon(options.icons.caret, 'span'),
              tooltip: lang.paragraph.paragraph,
              data: {
                toggle: 'dropdown'
              }
            }),
            ui.dropdown([
              ui.buttonGroup({
                className: 'note-align',
                children: [justifyLeft, justifyCenter, justifyRight, justifyFull]
              }),
              ui.buttonGroup({
                className: 'note-list',
                children: [outdent, indent]
              })
            ])
          ]).render();
        });
  
        context.memo('button.height', function () {
          return ui.buttonGroup([
            ui.button({
              className: 'dropdown-toggle',
              contents: ui.icon(options.icons.textHeight) + ' ' + ui.icon(options.icons.caret, 'span'),
              tooltip: lang.font.height,
              data: {
                toggle: 'dropdown'
              }
            }),
            ui.dropdownCheck({
              items: options.lineHeights,
              checkClassName: options.icons.menuCheck,
              className: 'dropdown-line-height',
              click: context.createInvokeHandler('editor.lineHeight')
            })
          ]).render();
        });
  
        context.memo('button.table', function () {
          return ui.buttonGroup([
            ui.button({
              className: 'dropdown-toggle',
              contents: ui.icon(options.icons.table) + ' ' + ui.icon(options.icons.caret, 'span'),
              tooltip: lang.table.table,
              data: {
                toggle: 'dropdown'
              }
            }),
            ui.dropdown({
              className: 'note-table',
              items: [
                '<div class="note-dimension-picker">',
                '  <div class="note-dimension-picker-mousecatcher" data-event="insertTable" data-value="1x1"/>',
                '  <div class="note-dimension-picker-highlighted"/>',
                '  <div class="note-dimension-picker-unhighlighted"/>',
                '</div>',
                '<div class="note-dimension-display">1 x 1</div>'
              ].join('')
            })
          ], {
            callback: function ($node) {
              var $catcher = $node.find('.note-dimension-picker-mousecatcher');
              $catcher.css({
                width: options.insertTableMaxSize.col + 'em',
                height: options.insertTableMaxSize.row + 'em'
              }).mousedown(context.createInvokeHandler('editor.insertTable'))
                .on('mousemove', self.tableMoveHandler);
            }
          }).render();
        });
  
        context.memo('button.link', function () {
          return ui.button({
            contents: ui.icon(options.icons.link),
            tooltip: lang.link.link,
            click: context.createInvokeHandler('linkDialog.show')
          }).render();
        });
  
        context.memo('button.picture', function () {
          return ui.button({
            contents: ui.icon(options.icons.picture),
            tooltip: lang.image.image,
            click: context.createInvokeHandler('imageDialog.show')
          }).render();
        });
  
        context.memo('button.video', function () {
          return ui.button({
            contents: ui.icon(options.icons.video),
            tooltip: lang.video.video,
            click: context.createInvokeHandler('videoDialog.show')
          }).render();
        });
  
        context.memo('button.hr', function () {
          return ui.button({
            contents: ui.icon(options.icons.minus),
            tooltip: lang.hr.insert + representShortcut('insertHorizontalRule'),
            click: context.createInvokeHandler('editor.insertHorizontalRule')
          }).render();
        });
  
        context.memo('button.fullscreen', function () {
          return ui.button({
            className: 'btn-fullscreen',
            contents: ui.icon(options.icons.arrowsAlt),
            tooltip: lang.options.fullscreen,
            click: context.createInvokeHandler('fullscreen.toggle')
          }).render();
        });
  
        context.memo('button.codeview', function () {
          return ui.button({
            className: 'btn-codeview',
            contents: ui.icon(options.icons.code),
            tooltip: lang.options.codeview,
            click: context.createInvokeHandler('codeview.toggle')
          }).render();
        });
  
        context.memo('button.redo', function () {
          return ui.button({
            contents: ui.icon(options.icons.redo),
            tooltip: lang.history.redo + representShortcut('redo'),
            click: context.createInvokeHandler('editor.redo')
          }).render();
        });
  
        context.memo('button.undo', function () {
          return ui.button({
            contents: ui.icon(options.icons.undo),
            tooltip: lang.history.undo + representShortcut('undo'),
            click: context.createInvokeHandler('editor.undo')
          }).render();
        });
  
        context.memo('button.help', function () {
          return ui.button({
            contents: ui.icon(options.icons.question),
            tooltip: lang.options.help,
            click: context.createInvokeHandler('helpDialog.show')
          }).render();
        });
      };
  
      /**
       * image : [
       *   ['imagesize', ['imageSize100', 'imageSize50', 'imageSize25']],
       *   ['float', ['floatLeft', 'floatRight', 'floatNone' ]],
       *   ['remove', ['removeMedia']]
       * ],
       */
      this.addImagePopoverButtons = function () {
        // Image Size Buttons
        context.memo('button.imageSize100', function () {
          return ui.button({
            contents: '<span class="note-fontsize-10">100%</span>',
            tooltip: lang.image.resizeFull,
            click: context.createInvokeHandler('editor.resize', '1')
          }).render();
        });
        context.memo('button.imageSize50', function () {
          return  ui.button({
            contents: '<span class="note-fontsize-10">50%</span>',
            tooltip: lang.image.resizeHalf,
            click: context.createInvokeHandler('editor.resize', '0.5')
          }).render();
        });
        context.memo('button.imageSize25', function () {
          return ui.button({
            contents: '<span class="note-fontsize-10">25%</span>',
            tooltip: lang.image.resizeQuarter,
            click: context.createInvokeHandler('editor.resize', '0.25')
          }).render();
        });
  
        // Float Buttons
        context.memo('button.floatLeft', function () {
          return ui.button({
            contents: ui.icon(options.icons.alignLeft),
            tooltip: lang.image.floatLeft,
            click: context.createInvokeHandler('editor.floatMe', 'left')
          }).render();
        });
  
        context.memo('button.floatRight', function () {
          return ui.button({
            contents: ui.icon(options.icons.alignRight),
            tooltip: lang.image.floatRight,
            click: context.createInvokeHandler('editor.floatMe', 'right')
          }).render();
        });
  
        context.memo('button.floatNone', function () {
          return ui.button({
            contents: ui.icon(options.icons.alignJustify),
            tooltip: lang.image.floatNone,
            click: context.createInvokeHandler('editor.floatMe', 'none')
          }).render();
        });
  
        // Remove Buttons
        context.memo('button.removeMedia', function () {
          return ui.button({
            contents: ui.icon(options.icons.trash),
            tooltip: lang.image.remove,
            click: context.createInvokeHandler('editor.removeMedia')
          }).render();
        });
      };
  
      this.addLinkPopoverButtons = function () {
        context.memo('button.linkDialogShow', function () {
          return ui.button({
            contents: ui.icon(options.icons.link),
            tooltip: lang.link.edit,
            click: context.createInvokeHandler('linkDialog.show')
          }).render();
        });
  
        context.memo('button.unlink', function () {
          return ui.button({
            contents: ui.icon(options.icons.unlink),
            tooltip: lang.link.unlink,
            click: context.createInvokeHandler('editor.unlink')
          }).render();
        });
      };
  
      this.build = function ($container, groups) {
        for (var groupIdx = 0, groupLen = groups.length; groupIdx < groupLen; groupIdx++) {
          var group = groups[groupIdx];
          var groupName = group[0];
          var buttons = group[1];
  
          var $group = ui.buttonGroup({
            className: 'note-' + groupName
          }).render();
  
          for (var idx = 0, len = buttons.length; idx < len; idx++) {
            var button = context.memo('button.' + buttons[idx]);
            if (button) {
              $group.append(typeof button === 'function' ? button(context) : button);
            }
          }
          $group.appendTo($container);
        }
      };
  
      this.updateCurrentStyle = function () {
        var styleInfo = context.invoke('editor.currentStyle');
        this.updateBtnStates({
          '.note-btn-bold': function () {
            return styleInfo['font-bold'] === 'bold';
          },
          '.note-btn-italic': function () {
            return styleInfo['font-italic'] === 'italic';
          },
          '.note-btn-underline': function () {
            return styleInfo['font-underline'] === 'underline';
          },
          '.note-btn-subscript': function () {
            return styleInfo['font-subscript'] === 'subscript';
          },
          '.note-btn-superscript': function () {
            return styleInfo['font-superscript'] === 'superscript';
          },
          '.note-btn-strikethrough': function () {
            return styleInfo['font-strikethrough'] === 'strikethrough';
          }
        });
  
        if (styleInfo['font-family']) {
          var fontNames = styleInfo['font-family'].split(',').map(function (name) {
            return name.replace(/[\'\"]/g, '')
              .replace(/\s+$/, '')
              .replace(/^\s+/, '');
          });
          var fontName = list.find(fontNames, self.isFontInstalled);
  
          $toolbar.find('.dropdown-fontname li a').each(function () {
            // always compare string to avoid creating another func.
            var isChecked = ($(this).data('value') + '') === (fontName + '');
            this.className = isChecked ? 'checked' : '';
          });
          $toolbar.find('.note-current-fontname').text(fontName);
        }
  
        if (styleInfo['font-size']) {
          var fontSize = styleInfo['font-size'];
          $toolbar.find('.dropdown-fontsize li a').each(function () {
            // always compare with string to avoid creating another func.
            var isChecked = ($(this).data('value') + '') === (fontSize + '');
            this.className = isChecked ? 'checked' : '';
          });
          $toolbar.find('.note-current-fontsize').text(fontSize);
        }
  
        if (styleInfo['line-height']) {
          var lineHeight = styleInfo['line-height'];
          $toolbar.find('.dropdown-line-height li a').each(function () {
            // always compare with string to avoid creating another func.
            var isChecked = ($(this).data('value') + '') === (lineHeight + '');
            this.className = isChecked ? 'checked' : '';
          });
        }
      };
  
      this.updateBtnStates = function (infos) {
        $.each(infos, function (selector, pred) {
          ui.toggleBtnActive($toolbar.find(selector), pred());
        });
      };
  
      this.tableMoveHandler = function (event) {
        var PX_PER_EM = 18;
        var $picker = $(event.target.parentNode); // target is mousecatcher
        var $dimensionDisplay = $picker.next();
        var $catcher = $picker.find('.note-dimension-picker-mousecatcher');
        var $highlighted = $picker.find('.note-dimension-picker-highlighted');
        var $unhighlighted = $picker.find('.note-dimension-picker-unhighlighted');
  
        var posOffset;
        // HTML5 with jQuery - e.offsetX is undefined in Firefox
        if (event.offsetX === undefined) {
          var posCatcher = $(event.target).offset();
          posOffset = {
            x: event.pageX - posCatcher.left,
            y: event.pageY - posCatcher.top
          };
        } else {
          posOffset = {
            x: event.offsetX,
            y: event.offsetY
          };
        }
  
        var dim = {
          c: Math.ceil(posOffset.x / PX_PER_EM) || 1,
          r: Math.ceil(posOffset.y / PX_PER_EM) || 1
        };
  
        $highlighted.css({ width: dim.c + 'em', height: dim.r + 'em' });
        $catcher.data('value', dim.c + 'x' + dim.r);
  
        if (3 < dim.c && dim.c < options.insertTableMaxSize.col) {
          $unhighlighted.css({ width: dim.c + 1 + 'em'});
        }
  
        if (3 < dim.r && dim.r < options.insertTableMaxSize.row) {
          $unhighlighted.css({ height: dim.r + 1 + 'em'});
        }
  
        $dimensionDisplay.html(dim.c + ' x ' + dim.r);
      };
    };
  
    var Toolbar = function (context) {
      var ui = $.summernote.ui;
  
      var $note = context.layoutInfo.note;
      var $toolbar = context.layoutInfo.toolbar;
      var options = context.options;
  
      this.shouldInitialize = function () {
        return !options.airMode;
      };
  
      this.initialize = function () {
        options.toolbar = options.toolbar || [];
  
        if (!options.toolbar.length) {
          $toolbar.hide();
        } else {
          context.invoke('buttons.build', $toolbar, options.toolbar);
        }
  
        if (options.toolbarContainer) {
          $toolbar.appendTo(options.toolbarContainer);
        }
  
        $note.on('summernote.keyup summernote.mouseup summernote.change', function () {
          context.invoke('buttons.updateCurrentStyle');
        });
  
        context.invoke('buttons.updateCurrentStyle');
      };
  
      this.destroy = function () {
        $toolbar.children().remove();
      };
  
      this.updateFullscreen = function (isFullscreen) {
        ui.toggleBtnActive($toolbar.find('.btn-fullscreen'), isFullscreen);
      };
  
      this.updateCodeview = function (isCodeview) {
        ui.toggleBtnActive($toolbar.find('.btn-codeview'), isCodeview);
        if (isCodeview) {
          this.deactivate();
        } else {
          this.activate();
        }
      };
  
      this.activate = function (isIncludeCodeview) {
        var $btn = $toolbar.find('button');
        if (!isIncludeCodeview) {
          $btn = $btn.not('.btn-codeview');
        }
        ui.toggleBtn($btn, true);
      };
  
      this.deactivate = function (isIncludeCodeview) {
        var $btn = $toolbar.find('button');
        if (!isIncludeCodeview) {
          $btn = $btn.not('.btn-codeview');
        }
        ui.toggleBtn($btn, false);
      };
    };
  
    var LinkDialog = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var $editor = context.layoutInfo.editor;
      var options = context.options;
      var lang = options.langInfo;
  
      this.initialize = function () {
        var $container = options.dialogsInBody ? $(document.body) : $editor;
  
        var body = '<div class="form-group">' +
                     '<label>' + lang.link.textToDisplay + '</label>' +
                     '<input class="note-link-text form-control" type="text" />' +
                   '</div>' +
                   '<div class="form-group">' +
                     '<label>' + lang.link.url + '</label>' +
                     '<input class="note-link-url form-control" type="text" value="http://" />' +
                   '</div>' +
                   (!options.disableLinkTarget ?
                     '<div class="checkbox">' +
                       '<label>' + '<input type="checkbox" checked> ' + lang.link.openInNewWindow + '</label>' +
                     '</div>' : ''
                   );
        var footer = '<button href="#" class="btn btn-primary note-link-btn disabled" disabled>' + lang.link.insert + '</button>';
  
        this.$dialog = ui.dialog({
          className: 'link-dialog',
          title: lang.link.insert,
          fade: options.dialogsFade,
          body: body,
          footer: footer
        }).render().appendTo($container);
      };
  
      this.destroy = function () {
        ui.hideDialog(this.$dialog);
        this.$dialog.remove();
      };
  
      this.bindEnterKey = function ($input, $btn) {
        $input.on('keypress', function (event) {
          if (event.keyCode === key.code.ENTER) {
            $btn.trigger('click');
          }
        });
      };
  
      /**
       * Show link dialog and set event handlers on dialog controls.
       *
       * @param {Object} linkInfo
       * @return {Promise}
       */
      this.showLinkDialog = function (linkInfo) {
        return $.Deferred(function (deferred) {
          var $linkText = self.$dialog.find('.note-link-text'),
          $linkUrl = self.$dialog.find('.note-link-url'),
          $linkBtn = self.$dialog.find('.note-link-btn'),
          $openInNewWindow = self.$dialog.find('input[type=checkbox]');
  
          ui.onDialogShown(self.$dialog, function () {
            context.triggerEvent('dialog.shown');
  
            $linkText.val(linkInfo.text);
  
            $linkText.on('input', function () {
              ui.toggleBtn($linkBtn, $linkText.val() && $linkUrl.val());
              // if linktext was modified by keyup,
              // stop cloning text from linkUrl
              linkInfo.text = $linkText.val();
            });
  
            // if no url was given, copy text to url
            if (!linkInfo.url) {
              linkInfo.url = linkInfo.text || 'http://';
              ui.toggleBtn($linkBtn, linkInfo.text);
            }
  
            $linkUrl.on('input', function () {
              ui.toggleBtn($linkBtn, $linkText.val() && $linkUrl.val());
              // display same link on `Text to display` input
              // when create a new link
              if (!linkInfo.text) {
                $linkText.val($linkUrl.val());
              }
            }).val(linkInfo.url).trigger('focus');
  
            self.bindEnterKey($linkUrl, $linkBtn);
            self.bindEnterKey($linkText, $linkBtn);
  
            $openInNewWindow.prop('checked', linkInfo.isNewWindow);
  
            $linkBtn.one('click', function (event) {
              event.preventDefault();
  
              deferred.resolve({
                range: linkInfo.range,
                url: $linkUrl.val(),
                text: $linkText.val(),
                isNewWindow: $openInNewWindow.is(':checked')
              });
              self.$dialog.modal('hide');
            });
          });
  
          ui.onDialogHidden(self.$dialog, function () {
            // detach events
            $linkText.off('input keypress');
            $linkUrl.off('input keypress');
            $linkBtn.off('click');
  
            if (deferred.state() === 'pending') {
              deferred.reject();
            }
          });
  
          ui.showDialog(self.$dialog);
        }).promise();
      };
  
      /**
       * @param {Object} layoutInfo
       */
      this.show = function () {
        var linkInfo = context.invoke('editor.getLinkInfo');
  
        context.invoke('editor.saveRange');
        this.showLinkDialog(linkInfo).then(function (linkInfo) {
          context.invoke('editor.restoreRange');
          context.invoke('editor.createLink', linkInfo);
        }).fail(function () {
          context.invoke('editor.restoreRange');
        });
      };
      context.memo('help.linkDialog.show', options.langInfo.help['linkDialog.show']);
    };
  
    var LinkPopover = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var options = context.options;
  
      this.events = {
        'summernote.keyup summernote.mouseup summernote.change summernote.scroll': function () {
          self.update();
        },
        'summernote.dialog.shown': function () {
          self.hide();
        }
      };
  
      this.shouldInitialize = function () {
        return !list.isEmpty(options.popover.link);
      };
  
      this.initialize = function () {
        this.$popover = ui.popover({
          className: 'note-link-popover',
          callback: function ($node) {
            var $content = $node.find('.popover-content');
            $content.prepend('<span><a target="_blank"></a>&nbsp;</span>');
          }
        }).render().appendTo('body');
        var $content = this.$popover.find('.popover-content');
  
        context.invoke('buttons.build', $content, options.popover.link);
      };
  
      this.destroy = function () {
        this.$popover.remove();
      };
  
      this.update = function () {
        // Prevent focusing on editable when invoke('code') is executed
        if (!context.invoke('editor.hasFocus')) {
          this.hide();
          return;
        }
  
        var rng = context.invoke('editor.createRange');
        if (rng.isCollapsed() && rng.isOnAnchor()) {
          var anchor = dom.ancestor(rng.sc, dom.isAnchor);
          var href = $(anchor).attr('href');
          this.$popover.find('a').attr('href', href).html(href);
  
          var pos = dom.posFromPlaceholder(anchor);
          this.$popover.css({
            display: 'block',
            left: pos.left,
            top: pos.top
          });
        } else {
          this.hide();
        }
      };
  
      this.hide = function () {
        this.$popover.hide();
      };
    };
  
    var ImageDialog = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var $editor = context.layoutInfo.editor;
      var options = context.options;
      var lang = options.langInfo;
  
      this.initialize = function () {
        var $container = options.dialogsInBody ? $(document.body) : $editor;
  
        var imageLimitation = '';
        if (options.maximumImageFileSize) {
          var unit = Math.floor(Math.log(options.maximumImageFileSize) / Math.log(1024));
          var readableSize = (options.maximumImageFileSize / Math.pow(1024, unit)).toFixed(2) * 1 +
                             ' ' + ' KMGTP'[unit] + 'B';
          imageLimitation = '<small>' + lang.image.maximumFileSize + ' : ' + readableSize + '</small>';
        }
  
        var body = '<div class="form-group note-group-select-from-files">' +
                     '<label>' + lang.image.selectFromFiles + '</label>' +
                     '<input class="note-image-input form-control" type="file" name="files" accept="image/*" multiple="multiple" />' +
                     imageLimitation +
                   '</div>' +
                   '<div class="form-group" style="overflow:auto;">' +
                     '<label>' + lang.image.url + '</label>' +
                     '<input class="note-image-url form-control col-md-12" type="text" />' +
                   '</div>';
        var footer = '<button href="#" class="btn btn-primary note-image-btn disabled" disabled>' + lang.image.insert + '</button>';
  
        this.$dialog = ui.dialog({
          title: lang.image.insert,
          fade: options.dialogsFade,
          body: body,
          footer: footer
        }).render().appendTo($container);
      };
  
      this.destroy = function () {
        ui.hideDialog(this.$dialog);
        this.$dialog.remove();
      };
  
      this.bindEnterKey = function ($input, $btn) {
        $input.on('keypress', function (event) {
          if (event.keyCode === key.code.ENTER) {
            $btn.trigger('click');
          }
        });
      };
  
      this.show = function () {
        context.invoke('editor.saveRange');
        this.showImageDialog().then(function (data) {
          // [workaround] hide dialog before restore range for IE range focus
          ui.hideDialog(self.$dialog);
          context.invoke('editor.restoreRange');
  
          if (typeof data === 'string') { // image url
            context.invoke('editor.insertImage', data);
          } else { // array of files
            context.invoke('editor.insertImagesOrCallback', data);
          }
        }).fail(function () {
          context.invoke('editor.restoreRange');
        });
      };
  
      /**
       * show image dialog
       *
       * @param {jQuery} $dialog
       * @return {Promise}
       */
      this.showImageDialog = function () {
        return $.Deferred(function (deferred) {
          var $imageInput = self.$dialog.find('.note-image-input'),
              $imageUrl = self.$dialog.find('.note-image-url'),
              $imageBtn = self.$dialog.find('.note-image-btn');
  
          ui.onDialogShown(self.$dialog, function () {
            context.triggerEvent('dialog.shown');
  
            // Cloning imageInput to clear element.
            $imageInput.replaceWith($imageInput.clone()
              .on('change', function () {
                deferred.resolve(this.files || this.value);
              })
              .val('')
            );
  
            $imageBtn.click(function (event) {
              event.preventDefault();
  
              deferred.resolve($imageUrl.val());
            });
  
            $imageUrl.on('keyup paste', function () {
              var url = $imageUrl.val();
              ui.toggleBtn($imageBtn, url);
            }).val('').trigger('focus');
            self.bindEnterKey($imageUrl, $imageBtn);
          });
  
          ui.onDialogHidden(self.$dialog, function () {
            $imageInput.off('change');
            $imageUrl.off('keyup paste keypress');
            $imageBtn.off('click');
  
            if (deferred.state() === 'pending') {
              deferred.reject();
            }
          });
  
          ui.showDialog(self.$dialog);
        });
      };
    };
  
    var ImagePopover = function (context) {
      var ui = $.summernote.ui;
  
      var options = context.options;
  
      this.shouldInitialize = function () {
        return !list.isEmpty(options.popover.image);
      };
  
      this.initialize = function () {
        this.$popover = ui.popover({
          className: 'note-image-popover'
        }).render().appendTo('body');
        var $content = this.$popover.find('.popover-content');
  
        context.invoke('buttons.build', $content, options.popover.image);
      };
  
      this.destroy = function () {
        this.$popover.remove();
      };
  
      this.update = function (target) {
        if (dom.isImg(target)) {
          var pos = dom.posFromPlaceholder(target);
          this.$popover.css({
            display: 'block',
            left: pos.left,
            top: pos.top
          });
        } else {
          this.hide();
        }
      };
  
      this.hide = function () {
        this.$popover.hide();
      };
    };
  
    var VideoDialog = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var $editor = context.layoutInfo.editor;
      var options = context.options;
      var lang = options.langInfo;
  
      this.initialize = function () {
        var $container = options.dialogsInBody ? $(document.body) : $editor;
  
        var body = '<div class="form-group row-fluid">' +
            '<label>' + lang.video.url + ' <small class="text-muted">' + lang.video.providers + '</small></label>' +
            '<input class="note-video-url form-control span12" type="text" />' +
            '</div>';
        var footer = '<button href="#" class="btn btn-primary note-video-btn disabled" disabled>' + lang.video.insert + '</button>';
  
        this.$dialog = ui.dialog({
          title: lang.video.insert,
          fade: options.dialogsFade,
          body: body,
          footer: footer
        }).render().appendTo($container);
      };
  
      this.destroy = function () {
        ui.hideDialog(this.$dialog);
        this.$dialog.remove();
      };
  
      this.bindEnterKey = function ($input, $btn) {
        $input.on('keypress', function (event) {
          if (event.keyCode === key.code.ENTER) {
            $btn.trigger('click');
          }
        });
      };
  
      this.createVideoNode = function (url) {
        // video url patterns(youtube, instagram, vimeo, dailymotion, youku, mp4, ogg, webm)
        var ytRegExp = /^(?:https?:\/\/)?(?:www\.)?(?:youtu\.be\/|youtube\.com\/(?:embed\/|v\/|watch\?v=|watch\?.+&v=))((\w|-){11})(?:\S+)?$/;
        var ytMatch = url.match(ytRegExp);
  
        var igRegExp = /\/\/instagram.com\/p\/(.[a-zA-Z0-9_-]*)/;
        var igMatch = url.match(igRegExp);
  
        var vRegExp = /\/\/vine.co\/v\/(.[a-zA-Z0-9]*)/;
        var vMatch = url.match(vRegExp);
  
        var vimRegExp = /\/\/(player.)?vimeo.com\/([a-z]*\/)*([0-9]{6,11})[?]?.*/;
        var vimMatch = url.match(vimRegExp);
  
        var dmRegExp = /.+dailymotion.com\/(video|hub)\/([^_]+)[^#]*(#video=([^_&]+))?/;
        var dmMatch = url.match(dmRegExp);
  
        var youkuRegExp = /\/\/v\.youku\.com\/v_show\/id_(\w+)=*\.html/;
        var youkuMatch = url.match(youkuRegExp);
  
        var mp4RegExp = /^.+.(mp4|m4v)$/;
        var mp4Match = url.match(mp4RegExp);
  
        var oggRegExp = /^.+.(ogg|ogv)$/;
        var oggMatch = url.match(oggRegExp);
  
        var webmRegExp = /^.+.(webm)$/;
        var webmMatch = url.match(webmRegExp);
  
        var $video;
        if (ytMatch && ytMatch[1].length === 11) {
          var youtubeId = ytMatch[1];
          $video = $('<iframe>')
              .attr('frameborder', 0)
              .attr('src', '//www.youtube.com/embed/' + youtubeId)
              .attr('width', '640').attr('height', '360');
        } else if (igMatch && igMatch[0].length) {
          $video = $('<iframe>')
              .attr('frameborder', 0)
              .attr('src', igMatch[0] + '/embed/')
              .attr('width', '612').attr('height', '710')
              .attr('scrolling', 'no')
              .attr('allowtransparency', 'true');
        } else if (vMatch && vMatch[0].length) {
          $video = $('<iframe>')
              .attr('frameborder', 0)
              .attr('src', vMatch[0] + '/embed/simple')
              .attr('width', '600').attr('height', '600')
              .attr('class', 'vine-embed');
        } else if (vimMatch && vimMatch[3].length) {
          $video = $('<iframe webkitallowfullscreen mozallowfullscreen allowfullscreen>')
              .attr('frameborder', 0)
              .attr('src', '//player.vimeo.com/video/' + vimMatch[3])
              .attr('width', '640').attr('height', '360');
        } else if (dmMatch && dmMatch[2].length) {
          $video = $('<iframe>')
              .attr('frameborder', 0)
              .attr('src', '//www.dailymotion.com/embed/video/' + dmMatch[2])
              .attr('width', '640').attr('height', '360');
        } else if (youkuMatch && youkuMatch[1].length) {
          $video = $('<iframe webkitallowfullscreen mozallowfullscreen allowfullscreen>')
              .attr('frameborder', 0)
              .attr('height', '498')
              .attr('width', '510')
              .attr('src', '//player.youku.com/embed/' + youkuMatch[1]);
        } else if (mp4Match || oggMatch || webmMatch) {
          $video = $('<video controls>')
              .attr('src', url)
              .attr('width', '640').attr('height', '360');
        } else {
          // this is not a known video link. Now what, Cat? Now what?
          return false;
        }
  
        $video.addClass('note-video-clip');
  
        return $video[0];
      };
  
      this.show = function () {
        var text = context.invoke('editor.getSelectedText');
        context.invoke('editor.saveRange');
        this.showVideoDialog(text).then(function (url) {
          // [workaround] hide dialog before restore range for IE range focus
          ui.hideDialog(self.$dialog);
          context.invoke('editor.restoreRange');
  
          // build node
          var $node = self.createVideoNode(url);
  
          if ($node) {
            // insert video node
            context.invoke('editor.insertNode', $node);
          }
        }).fail(function () {
          context.invoke('editor.restoreRange');
        });
      };
  
      /**
       * show image dialog
       *
       * @param {jQuery} $dialog
       * @return {Promise}
       */
      this.showVideoDialog = function (text) {
        return $.Deferred(function (deferred) {
          var $videoUrl = self.$dialog.find('.note-video-url'),
              $videoBtn = self.$dialog.find('.note-video-btn');
  
          ui.onDialogShown(self.$dialog, function () {
            context.triggerEvent('dialog.shown');
  
            $videoUrl.val(text).on('input', function () {
              ui.toggleBtn($videoBtn, $videoUrl.val());
            }).trigger('focus');
  
            $videoBtn.click(function (event) {
              event.preventDefault();
  
              deferred.resolve($videoUrl.val());
            });
  
            self.bindEnterKey($videoUrl, $videoBtn);
          });
  
          ui.onDialogHidden(self.$dialog, function () {
            $videoUrl.off('input');
            $videoBtn.off('click');
  
            if (deferred.state() === 'pending') {
              deferred.reject();
            }
          });
  
          ui.showDialog(self.$dialog);
        });
      };
    };
  
    var HelpDialog = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var $editor = context.layoutInfo.editor;
      var options = context.options;
      var lang = options.langInfo;
  
      this.createShortCutList = function () {
        var keyMap = options.keyMap[agent.isMac ? 'mac' : 'pc'];
        return Object.keys(keyMap).map(function (key) {
          var command = keyMap[key];
          var $row = $('<div><div class="help-list-item"/></div>');
          $row.append($('<label><kbd>' + key + '</kdb></label>').css({
            'width': 180,
            'margin-right': 10
          })).append($('<span/>').html(context.memo('help.' + command) || command));
          return $row.html();
        }).join('');
      };
  
      this.initialize = function () {
        var $container = options.dialogsInBody ? $(document.body) : $editor;
  
        var body = [
          '<p class="text-center">',
          '<a href="//summernote.org/" target="_blank">Summernote 0.8.1</a> · ',
          '<a href="//github.com/summernote/summernote" target="_blank">Project</a> · ',
          '<a href="//github.com/summernote/summernote/issues" target="_blank">Issues</a>',
          '</p>'
        ].join('');
  
        this.$dialog = ui.dialog({
          title: lang.options.help,
          fade: options.dialogsFade,
          body: this.createShortCutList(),
          footer: body,
          callback: function ($node) {
            $node.find('.modal-body').css({
              'max-height': 300,
              'overflow': 'scroll'
            });
          }
        }).render().appendTo($container);
      };
  
      this.destroy = function () {
        ui.hideDialog(this.$dialog);
        this.$dialog.remove();
      };
  
      /**
       * show help dialog
       *
       * @return {Promise}
       */
      this.showHelpDialog = function () {
        return $.Deferred(function (deferred) {
          ui.onDialogShown(self.$dialog, function () {
            context.triggerEvent('dialog.shown');
            deferred.resolve();
          });
          ui.showDialog(self.$dialog);
        }).promise();
      };
  
      this.show = function () {
        context.invoke('editor.saveRange');
        this.showHelpDialog().then(function () {
          context.invoke('editor.restoreRange');
        });
      };
    };
  
    var AirPopover = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var options = context.options;
  
      var AIR_MODE_POPOVER_X_OFFSET = 20;
  
      this.events = {
        'summernote.keyup summernote.mouseup summernote.scroll': function () {
          self.update();
        },
        'summernote.change summernote.dialog.shown': function () {
          self.hide();
        },
        'summernote.focusout': function (we, e) {
          // [workaround] Firefox doesn't support relatedTarget on focusout
          //  - Ignore hide action on focus out in FF.
          if (agent.isFF) {
            return;
          }
  
          if (!e.relatedTarget || !dom.ancestor(e.relatedTarget, func.eq(self.$popover[0]))) {
            self.hide();
          }
        }
      };
  
      this.shouldInitialize = function () {
        return options.airMode && !list.isEmpty(options.popover.air);
      };
  
      this.initialize = function () {
        this.$popover = ui.popover({
          className: 'note-air-popover'
        }).render().appendTo('body');
        var $content = this.$popover.find('.popover-content');
  
        context.invoke('buttons.build', $content, options.popover.air);
      };
  
      this.destroy = function () {
        this.$popover.remove();
      };
  
      this.update = function () {
        var styleInfo = context.invoke('editor.currentStyle');
        if (styleInfo.range && !styleInfo.range.isCollapsed()) {
          var rect = list.last(styleInfo.range.getClientRects());
          if (rect) {
            var bnd = func.rect2bnd(rect);
            this.$popover.css({
              display: 'block',
              left: Math.max(bnd.left + bnd.width / 2, 0) - AIR_MODE_POPOVER_X_OFFSET,
              top: bnd.top + bnd.height
            });
          }
        } else {
          this.hide();
        }
      };
  
      this.hide = function () {
        this.$popover.hide();
      };
    };
  
    var HintPopover = function (context) {
      var self = this;
      var ui = $.summernote.ui;
  
      var POPOVER_DIST = 5;
      var hint = context.options.hint || [];
      var direction = context.options.hintDirection || 'bottom';
      var hints = $.isArray(hint) ? hint : [hint];
  
      this.events = {
        'summernote.keyup': function (we, e) {
          if (!e.isDefaultPrevented()) {
            self.handleKeyup(e);
          }
        },
        'summernote.keydown': function (we, e) {
          self.handleKeydown(e);
        },
        'summernote.dialog.shown': function () {
          self.hide();
        }
      };
  
      this.shouldInitialize = function () {
        return hints.length > 0;
      };
  
      this.initialize = function () {
        this.lastWordRange = null;
        this.$popover = ui.popover({
          className: 'note-hint-popover',
          hideArrow: true,
          direction: ''
        }).render().appendTo('body');
  
        this.$popover.hide();
  
        this.$content = this.$popover.find('.popover-content');
  
        this.$content.on('click', '.note-hint-item', function () {
          self.$content.find('.active').removeClass('active');
          $(this).addClass('active');
          self.replace();
        });
      };
  
      this.destroy = function () {
        this.$popover.remove();
      };
  
      this.selectItem = function ($item) {
        this.$content.find('.active').removeClass('active');
        $item.addClass('active');
  
        this.$content[0].scrollTop = $item[0].offsetTop - (this.$content.innerHeight() / 2);
      };
  
      this.moveDown = function () {
        var $current = this.$content.find('.note-hint-item.active');
        var $next = $current.next();
  
        if ($next.length) {
          this.selectItem($next);
        } else {
          var $nextGroup = $current.parent().next();
  
          if (!$nextGroup.length) {
            $nextGroup = this.$content.find('.note-hint-group').first();
          }
  
          this.selectItem($nextGroup.find('.note-hint-item').first());
        }
      };
  
      this.moveUp = function () {
        var $current = this.$content.find('.note-hint-item.active');
        var $prev = $current.prev();
  
        if ($prev.length) {
          this.selectItem($prev);
        } else {
          var $prevGroup = $current.parent().prev();
  
          if (!$prevGroup.length) {
            $prevGroup = this.$content.find('.note-hint-group').last();
          }
  
          this.selectItem($prevGroup.find('.note-hint-item').last());
        }
      };
  
      this.replace = function () {
        var $item = this.$content.find('.note-hint-item.active');
  
        if ($item.length) {
          var node = this.nodeFromItem($item);
          this.lastWordRange.insertNode(node);
          range.createFromNode(node).collapse().select();
  
          this.lastWordRange = null;
          this.hide();
          context.invoke('editor.focus');
        }
  
      };
  
      this.nodeFromItem = function ($item) {
        var hint = hints[$item.data('index')];
        var item = $item.data('item');
        var node = hint.content ? hint.content(item) : item;
        if (typeof node === 'string') {
          node = dom.createText(node);
        }
        return node;
      };
  
      this.createItemTemplates = function (hintIdx, items) {
        var hint = hints[hintIdx];
        return items.map(function (item, idx) {
          var $item = $('<div class="note-hint-item"/>');
          $item.append(hint.template ? hint.template(item) : item + '');
          $item.data({
            'index': hintIdx,
            'item': item
          });
  
          if (hintIdx === 0 && idx === 0) {
            $item.addClass('active');
          }
          return $item;
        });
      };
  
      this.handleKeydown = function (e) {
        if (!this.$popover.is(':visible')) {
          return;
        }
  
        if (e.keyCode === key.code.ENTER) {
          e.preventDefault();
          this.replace();
        } else if (e.keyCode === key.code.UP) {
          e.preventDefault();
          this.moveUp();
        } else if (e.keyCode === key.code.DOWN) {
          e.preventDefault();
          this.moveDown();
        }
      };
  
      this.searchKeyword = function (index, keyword, callback) {
        var hint = hints[index];
        if (hint && hint.match.test(keyword) && hint.search) {
          var matches = hint.match.exec(keyword);
          hint.search(matches[1], callback);
        } else {
          callback();
        }
      };
  
      this.createGroup = function (idx, keyword) {
        var $group = $('<div class="note-hint-group note-hint-group-' + idx + '"/>');
        this.searchKeyword(idx, keyword, function (items) {
          items = items || [];
          if (items.length) {
            $group.html(self.createItemTemplates(idx, items));
            self.show();
          }
        });
  
        return $group;
      };
  
      this.handleKeyup = function (e) {
        if (list.contains([key.code.ENTER, key.code.UP, key.code.DOWN], e.keyCode)) {
          if (e.keyCode === key.code.ENTER) {
            if (this.$popover.is(':visible')) {
              return;
            }
          }
        } else {
          var wordRange = context.invoke('editor.createRange').getWordRange();
          var keyword = wordRange.toString();
          if (hints.length && keyword) {
            this.$content.empty();
  
            var bnd = func.rect2bnd(list.last(wordRange.getClientRects()));
            if (bnd) {
  
              this.$popover.hide();
  
              this.lastWordRange = wordRange;
  
              hints.forEach(function (hint, idx) {
                if (hint.match.test(keyword)) {
                  self.createGroup(idx, keyword).appendTo(self.$content);
                }
              });
  
              // set position for popover after group is created
              if (direction === 'top') {
                this.$popover.css({
                  left: bnd.left,
                  top: bnd.top - this.$popover.outerHeight() - POPOVER_DIST
                });
              } else {
                this.$popover.css({
                  left: bnd.left,
                  top: bnd.top + bnd.height + POPOVER_DIST
                });
              }
  
            }
          } else {
            this.hide();
          }
        }
      };
  
      this.show = function () {
        this.$popover.show();
      };
  
      this.hide = function () {
        this.$popover.hide();
      };
    };
  
  
    $.summernote = $.extend($.summernote, {
      version: '0.8.1',
      ui: ui,
  
      plugins: {},
  
      options: {
        modules: {
          'editor': Editor,
          'clipboard': Clipboard,
          'dropzone': Dropzone,
          'codeview': Codeview,
          'statusbar': Statusbar,
          'fullscreen': Fullscreen,
          'handle': Handle,
          // FIXME: HintPopover must be front of autolink
          //  - Script error about range when Enter key is pressed on hint popover
          'hintPopover': HintPopover,
          'autoLink': AutoLink,
          'autoSync': AutoSync,
          'placeholder': Placeholder,
          'buttons': Buttons,
          'toolbar': Toolbar,
          'linkDialog': LinkDialog,
          'linkPopover': LinkPopover,
          'imageDialog': ImageDialog,
          'imagePopover': ImagePopover,
          'videoDialog': VideoDialog,
          'helpDialog': HelpDialog,
          'airPopover': AirPopover
        },
  
        buttons: {},
        
        lang: 'en-US',
  
        // toolbar
        toolbar: [
          ['style', ['style']],
          ['font', ['bold', 'underline', 'clear']],
          ['fontname', ['fontname']],
          ['color', ['color']],
          ['para', ['ul', 'ol', 'paragraph']],
          ['table', ['table']],
          ['insert', ['link', 'picture', 'video']],
          ['view', ['fullscreen', 'codeview', 'help']]
        ],
  
        // popover
        popover: {
          image: [
            ['imagesize', ['imageSize100', 'imageSize50', 'imageSize25']],
            ['float', ['floatLeft', 'floatRight', 'floatNone']],
            ['remove', ['removeMedia']]
          ],
          link: [
            ['link', ['linkDialogShow', 'unlink']]
          ],
          air: [
            ['color', ['color']],
            ['font', ['bold', 'underline', 'clear']],
            ['para', ['ul', 'paragraph']],
            ['table', ['table']],
            ['insert', ['link', 'picture']]
          ]
        },
  
        // air mode: inline editor
        airMode: false,
  
        width: null,
        height: null,
  
        focus: false,
        tabSize: 4,
        styleWithSpan: true,
        shortcuts: true,
        textareaAutoSync: true,
        direction: null,
  
        styleTags: ['p', 'blockquote', 'pre', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6'],
  
        fontNames: [
          'Arial', 'Arial Black', 'Comic Sans MS', 'Courier New',
          'Helvetica Neue', 'Helvetica', 'Impact', 'Lucida Grande',
          'Tahoma', 'Times New Roman', 'Verdana'
        ],
  
        fontSizes: ['8', '9', '10', '11', '12', '14', '18', '24', '36'],
  
        // pallete colors(n x n)
        colors: [
          ['#000000', '#424242', '#636363', '#9C9C94', '#CEC6CE', '#EFEFEF', '#F7F7F7', '#FFFFFF'],
          ['#FF0000', '#FF9C00', '#FFFF00', '#00FF00', '#00FFFF', '#0000FF', '#9C00FF', '#FF00FF'],
          ['#F7C6CE', '#FFE7CE', '#FFEFC6', '#D6EFD6', '#CEDEE7', '#CEE7F7', '#D6D6E7', '#E7D6DE'],
          ['#E79C9C', '#FFC69C', '#FFE79C', '#B5D6A5', '#A5C6CE', '#9CC6EF', '#B5A5D6', '#D6A5BD'],
          ['#E76363', '#F7AD6B', '#FFD663', '#94BD7B', '#73A5AD', '#6BADDE', '#8C7BC6', '#C67BA5'],
          ['#CE0000', '#E79439', '#EFC631', '#6BA54A', '#4A7B8C', '#3984C6', '#634AA5', '#A54A7B'],
          ['#9C0000', '#B56308', '#BD9400', '#397B21', '#104A5A', '#085294', '#311873', '#731842'],
          ['#630000', '#7B3900', '#846300', '#295218', '#083139', '#003163', '#21104A', '#4A1031']
        ],
  
        lineHeights: ['1.0', '1.2', '1.4', '1.5', '1.6', '1.8', '2.0', '3.0'],
  
        tableClassName: 'table table-bordered',
  
        insertTableMaxSize: {
          col: 10,
          row: 10
        },
  
        dialogsInBody: false,
        dialogsFade: false,
  
        maximumImageFileSize: null,
  
        callbacks: {
          onInit: null,
          onFocus: null,
          onBlur: null,
          onEnter: null,
          onKeyup: null,
          onKeydown: null,
          onSubmit: null,
          onImageUpload: null,
          onImageUploadError: null
        },
  
        codemirror: {
          mode: 'text/html',
          htmlMode: true,
          lineNumbers: true
        },
  
        keyMap: {
          pc: {
            'ENTER': 'insertParagraph',
            'CTRL+Z': 'undo',
            'CTRL+Y': 'redo',
            'TAB': 'tab',
            'SHIFT+TAB': 'untab',
            'CTRL+B': 'bold',
            'CTRL+I': 'italic',
            'CTRL+U': 'underline',
            'CTRL+SHIFT+S': 'strikethrough',
            'CTRL+BACKSLASH': 'removeFormat',
            'CTRL+SHIFT+L': 'justifyLeft',
            'CTRL+SHIFT+E': 'justifyCenter',
            'CTRL+SHIFT+R': 'justifyRight',
            'CTRL+SHIFT+J': 'justifyFull',
            'CTRL+SHIFT+NUM7': 'insertUnorderedList',
            'CTRL+SHIFT+NUM8': 'insertOrderedList',
            'CTRL+LEFTBRACKET': 'outdent',
            'CTRL+RIGHTBRACKET': 'indent',
            'CTRL+NUM0': 'formatPara',
            'CTRL+NUM1': 'formatH1',
            'CTRL+NUM2': 'formatH2',
            'CTRL+NUM3': 'formatH3',
            'CTRL+NUM4': 'formatH4',
            'CTRL+NUM5': 'formatH5',
            'CTRL+NUM6': 'formatH6',
            'CTRL+ENTER': 'insertHorizontalRule',
            'CTRL+K': 'linkDialog.show'
          },
  
          mac: {
            'ENTER': 'insertParagraph',
            'CMD+Z': 'undo',
            'CMD+SHIFT+Z': 'redo',
            'TAB': 'tab',
            'SHIFT+TAB': 'untab',
            'CMD+B': 'bold',
            'CMD+I': 'italic',
            'CMD+U': 'underline',
            'CMD+SHIFT+S': 'strikethrough',
            'CMD+BACKSLASH': 'removeFormat',
            'CMD+SHIFT+L': 'justifyLeft',
            'CMD+SHIFT+E': 'justifyCenter',
            'CMD+SHIFT+R': 'justifyRight',
            'CMD+SHIFT+J': 'justifyFull',
            'CMD+SHIFT+NUM7': 'insertUnorderedList',
            'CMD+SHIFT+NUM8': 'insertOrderedList',
            'CMD+LEFTBRACKET': 'outdent',
            'CMD+RIGHTBRACKET': 'indent',
            'CMD+NUM0': 'formatPara',
            'CMD+NUM1': 'formatH1',
            'CMD+NUM2': 'formatH2',
            'CMD+NUM3': 'formatH3',
            'CMD+NUM4': 'formatH4',
            'CMD+NUM5': 'formatH5',
            'CMD+NUM6': 'formatH6',
            'CMD+ENTER': 'insertHorizontalRule',
            'CMD+K': 'linkDialog.show'
          }
        },
        icons: {
          'align': 'note-icon-align',
          'alignCenter': 'note-icon-align-center',
          'alignJustify': 'note-icon-align-justify',
          'alignLeft': 'note-icon-align-left',
          'alignRight': 'note-icon-align-right',
          'indent': 'note-icon-align-indent',
          'outdent': 'note-icon-align-outdent',
          'arrowsAlt': 'note-icon-arrows-alt',
          'bold': 'note-icon-bold',
          'caret': 'note-icon-caret',
          'circle': 'note-icon-circle',
          'close': 'note-icon-close',
          'code': 'note-icon-code',
          'eraser': 'note-icon-eraser',
          'font': 'note-icon-font',
          'frame': 'note-icon-frame',
          'italic': 'note-icon-italic',
          'link': 'note-icon-link',
          'unlink': 'note-icon-chain-broken',
          'magic': 'note-icon-magic',
          'menuCheck': 'note-icon-check',
          'minus': 'note-icon-minus',
          'orderedlist': 'note-icon-orderedlist',
          'pencil': 'note-icon-pencil',
          'picture': 'note-icon-picture',
          'question': 'note-icon-question',
          'redo': 'note-icon-redo',
          'square': 'note-icon-square',
          'strikethrough': 'note-icon-strikethrough',
          'subscript': 'note-icon-subscript',
          'superscript': 'note-icon-superscript',
          'table': 'note-icon-table',
          'textHeight': 'note-icon-text-height',
          'trash': 'note-icon-trash',
          'underline': 'note-icon-underline',
          'undo': 'note-icon-undo',
          'unorderedlist': 'note-icon-unorderedlist',
          'video': 'note-icon-video'
        }
      }
    });
  
  }));
  