!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.jsondiffpatch=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var environment = require('./environment');

if (environment.isBrowser) {
  /* global window */
  /* jshint camelcase: false */
  window.diff_match_patch = require('../public/external/diff_match_patch_uncompressed');
  /* jshint camelcase: true */
}

module.exports = require('./main');

},{"../public/external/diff_match_patch_uncompressed":2,"./environment":10,"./main":17}],2:[function(require,module,exports){
/**
 * Diff Match and Patch
 *
 * Copyright 2006 Google Inc.
 * http://code.google.com/p/google-diff-match-patch/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @fileoverview Computes the difference between two texts to create a patch.
 * Applies the patch onto another text, allowing for errors.
 * @author fraser@google.com (Neil Fraser)
 */

/**
 * Class containing the diff, match and patch methods.
 * @constructor
 */
function diff_match_patch() {

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

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

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


//  DIFF FUNCTIONS


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

/** @typedef {!Array.<number|string>} */
diff_match_patch.Diff;


/**
 * Find the differences between two texts.  Simplifies the problem by stripping
 * any common prefix or suffix off the texts before diffing.
 * @param {string} text1 Old string to be diffed.
 * @param {string} text2 New string to be diffed.
 * @param {boolean=} opt_checklines Optional speedup flag. If present and false,
 *     then don't run a line-level diff first to identify the changed areas.
 *     Defaults to true, which does a faster, slightly less optimal diff.
 * @param {number} opt_deadline Optional time when the diff should be complete
 *     by.  Used internally for recursive calls.  Users should set DiffTimeout
 *     instead.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 */
diff_match_patch.prototype.diff_main = function(text1, text2, opt_checklines,
    opt_deadline) {
  // Set a deadline by which time the diff must be complete.
  if (typeof opt_deadline == 'undefined') {
    if (this.Diff_Timeout <= 0) {
      opt_deadline = Number.MAX_VALUE;
    } else {
      opt_deadline = (new Date).getTime() + this.Diff_Timeout * 1000;
    }
  }
  var deadline = opt_deadline;

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

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

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

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

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

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

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


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

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

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

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

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

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

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

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


/**
 * Do a quick line-level diff on both strings, then rediff the parts for
 * greater accuracy.
 * This speedup can produce non-minimal diffs.
 * @param {string} text1 Old string to be diffed.
 * @param {string} text2 New string to be diffed.
 * @param {number} deadline Time when the diff should be complete by.
 * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.
 * @private
 */
diff_match_patch.prototype.diff_lineMode_ = function(text1, text2, deadline) {
  // Scan the text on a line-by-line basis first.
  var a = this.diff_linesToChars_(text1, text2);
  text1 = /** @type {string} */(a[0]);
  text2 = /** @type {string} */(a[1]);
  var linearray = /** @type {!Array.<string>} */(a[2]);

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

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

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

  return diffs;
};


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

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

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


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

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

  return diffs.concat(diffsb);
};


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

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

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

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

  var chars1 = diff_linesToCharsMunge_(text1);
  var chars2 = diff_linesToCharsMunge_(text2);
  return [chars1, chars2, lineArray];
};


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


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


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


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

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


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

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

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

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


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

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

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


/**
 * Look for single edits surrounded on both sides by equalities
 * which can be shifted sideways to align the edit to a word boundary.
 * e.g: The c<ins>at c</ins>ame. -> The <ins>cat </ins>came.
 * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.
 */
diff_match_patch.prototype.diff_cleanupSemanticLossless = function(diffs) {
  // Define some regex patterns for matching boundaries.
  var punctuation = /[^a-zA-Z0-9]/;
  var whitespace = /\s/;
  var linebreak = /[\r\n]/;
  var blanklineEnd = /\n\r?\n$/;
  var blanklineStart = /^\r?\n\r?\n/;

  /**
   * Given two strings, compute a score representing whether the internal
   * boundary falls on logical boundaries.
   * Scores range from 5 (best) to 0 (worst).
   * Closure, makes reference to regex patterns defined above.
   * @param {string} one First string.
   * @param {string} two Second string.
   * @return {number} The score.
   * @private
   */
  function diff_cleanupSemanticScore_(one, two) {
    if (!one || !two) {
      // Edges are the best.
      return 5;
    }

    // Each port of this function behaves slightly differently due to
    // subtle differences in each language's definition of things like
    // 'whitespace'.  Since this function's purpose is largely cosmetic,
    // the choice has been made to use each language's native features
    // rather than force total conformity.
    var score = 0;
    // One point for non-alphanumeric.
    if (one.charAt(one.length - 1).match(punctuation) ||
        two.charAt(0).match(punctuation)) {
      score++;
      // Two points for whitespace.
      if (one.charAt(one.length - 1).match(whitespace) ||
          two.charAt(0).match(whitespace)) {
        score++;
        // Three points for line breaks.
        if (one.charAt(one.length - 1).match(linebreak) ||
            two.charAt(0).match(linebreak)) {
          score++;
          // Four points for blank lines.
          if (one.match(blanklineEnd) || two.match(blanklineStart)) {
            score++;
          }
        }
      }
    }
    return score;
  }

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

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

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

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


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

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


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

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


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


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


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


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


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


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


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


//  MATCH FUNCTIONS


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

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


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

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

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

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

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

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

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

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


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


//  PATCH FUNCTIONS


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

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

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

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


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

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

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

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

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

  return patches;
};


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


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

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

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

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


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

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

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

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

  return nullPadding;
};


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


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


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

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

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


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


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


// Export these global variables so that they survive Google's JS compiler.
// In a browser, 'this' will be 'window'.
// In node.js 'this' will be a global object.
this['diff_match_patch'] = diff_match_patch;
this['DIFF_DELETE'] = DIFF_DELETE;
this['DIFF_INSERT'] = DIFF_INSERT;
this['DIFF_EQUAL'] = DIFF_EQUAL;


},{}],3:[function(require,module,exports){

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

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

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

module.exports = clone;

},{}],4:[function(require,module,exports){

var Pipe = require('../pipe').Pipe;

var Context = function Context(){
};

Context.prototype.setResult = function(result) {
	this.result = result;
	this.hasResult = true;
	return this;
};

Context.prototype.exit = function() {
	this.exiting = true;
	return this;
};

Context.prototype.switchTo = function(next, pipe) {
	if (typeof next === 'string' || next instanceof Pipe) {
		this.nextPipe = next;
	} else {
		this.next = next;
		if (pipe) {
			this.nextPipe = pipe;
		}
	}
	return this;
};

Context.prototype.push = function(child, name) {
	child.parent = this;
	if (typeof name !== 'undefined') {
		child.childName = name;
	}
	child.root = this.root || this;
	child.options = child.options || this.options;
	if (!this.children) {
		this.children = [child];
		this.nextAfterChildren = this.next || null;
		this.next = child;
	} else {
		this.children[this.children.length - 1].next = child;
		this.children.push(child);
	}
	child.next = this;
	return this;
};

exports.Context = Context;

},{"../pipe":18}],5:[function(require,module,exports){
var Context = require('./context').Context;
var defaultClone = require('../clone');

var DiffContext = function DiffContext(left, right) {
  this.left = left;
  this.right = right;
  this.pipe = 'diff';
};

DiffContext.prototype = new Context();

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

exports.DiffContext = DiffContext;

},{"../clone":3,"./context":4}],6:[function(require,module,exports){
var Context = require('./context').Context;

var PatchContext = function PatchContext(left, delta) {
  this.left = left;
  this.delta = delta;
  this.pipe = 'patch';
};

PatchContext.prototype = new Context();

exports.PatchContext = PatchContext;

},{"./context":4}],7:[function(require,module,exports){
var Context = require('./context').Context;

var ReverseContext = function ReverseContext(delta) {
  this.delta = delta;
  this.pipe = 'reverse';
};

ReverseContext.prototype = new Context();

exports.ReverseContext = ReverseContext;

},{"./context":4}],8:[function(require,module,exports){
// use as 2nd parameter for JSON.parse to revive Date instances
module.exports = function dateReviver(key, value) {
  var parts;
  if (typeof value === 'string') {
    parts = /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2})(?:\.(\d*))?(Z|([+\-])(\d{2}):(\d{2}))$/.exec(value);
    if (parts) {
      return new Date(Date.UTC(+parts[1], +parts[2] - 1, +parts[3], +parts[4], +parts[5], +parts[6], +(parts[7] || 0)));
    }
  }
  return value;
};

},{}],9:[function(require,module,exports){
var Processor = require('./processor').Processor;
var Pipe = require('./pipe').Pipe;
var DiffContext = require('./contexts/diff').DiffContext;
var PatchContext = require('./contexts/patch').PatchContext;
var ReverseContext = require('./contexts/reverse').ReverseContext;

var clone = require('./clone');

var trivial = require('./filters/trivial');
var nested = require('./filters/nested');
var arrays = require('./filters/arrays');
var dates = require('./filters/dates');
var texts = require('./filters/texts');

var DiffPatcher = function DiffPatcher(options) {
  this.processor = new Processor(options);
  this.processor.pipe(new Pipe('diff').append(
    nested.collectChildrenDiffFilter,
    trivial.diffFilter,
    dates.diffFilter,
    texts.diffFilter,
    nested.objectsDiffFilter,
    arrays.diffFilter
  ).shouldHaveResult());
  this.processor.pipe(new Pipe('patch').append(
    nested.collectChildrenPatchFilter,
    arrays.collectChildrenPatchFilter,
    trivial.patchFilter,
    texts.patchFilter,
    nested.patchFilter,
    arrays.patchFilter
  ).shouldHaveResult());
  this.processor.pipe(new Pipe('reverse').append(
    nested.collectChildrenReverseFilter,
    arrays.collectChildrenReverseFilter,
    trivial.reverseFilter,
    texts.reverseFilter,
    nested.reverseFilter,
    arrays.reverseFilter
  ).shouldHaveResult());
};

DiffPatcher.prototype.options = function() {
  return this.processor.options.apply(this.processor, arguments);
};

DiffPatcher.prototype.diff = function(left, right) {
  return this.processor.process(new DiffContext(left, right));
};

DiffPatcher.prototype.patch = function(left, delta) {
  return this.processor.process(new PatchContext(left, delta));
};

DiffPatcher.prototype.reverse = function(delta) {
  return this.processor.process(new ReverseContext(delta));
};

DiffPatcher.prototype.unpatch = function(right, delta) {
  return this.patch(right, this.reverse(delta));
};

DiffPatcher.prototype.clone = function(value) {
  return clone(value);
};

exports.DiffPatcher = DiffPatcher;

},{"./clone":3,"./contexts/diff":5,"./contexts/patch":6,"./contexts/reverse":7,"./filters/arrays":11,"./filters/dates":12,"./filters/nested":14,"./filters/texts":15,"./filters/trivial":16,"./pipe":18,"./processor":19}],10:[function(require,module,exports){

exports.isBrowser = typeof window !== 'undefined';

},{}],11:[function(require,module,exports){
var DiffContext = require('../contexts/diff').DiffContext;
var PatchContext = require('../contexts/patch').PatchContext;
var ReverseContext = require('../contexts/reverse').ReverseContext;

var lcs = require('./lcs');

var ARRAY_MOVE = 3;

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

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

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

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

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

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

  var child;

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

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

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

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

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

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

  context.setResult(result).exit();

};
diffFilter.filterName = 'arrays';

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

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

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

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

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

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

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

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

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

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

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

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

  return reverseIndex;
};

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

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

exports.diffFilter = diffFilter;
exports.patchFilter = patchFilter;
exports.collectChildrenPatchFilter = collectChildrenPatchFilter;
exports.reverseFilter = reverseFilter;
exports.collectChildrenReverseFilter = collectChildrenReverseFilter;

},{"../contexts/diff":5,"../contexts/patch":6,"../contexts/reverse":7,"./lcs":13}],12:[function(require,module,exports){
var diffFilter = function datesDiffFilter(context) {
  if (context.left instanceof Date) {
    if (context.right instanceof Date) {
      if (context.left.getTime() !== context.right.getTime()) {
        context.setResult([context.left, context.right]);
      } else {
        context.setResult(undefined);
      }
    } else {
      context.setResult([context.left, context.right]);
    }
    context.exit();
  } else if (context.right instanceof Date) {
    context.setResult([context.left, context.right]).exit();
  }
};
diffFilter.filterName = 'dates';

exports.diffFilter = diffFilter;

},{}],13:[function(require,module,exports){
/*

LCS implementation that supports arrays or strings

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

*/

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

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

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

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

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

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

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

exports.get = get;

},{}],14:[function(require,module,exports){
var DiffContext = require('../contexts/diff').DiffContext;
var PatchContext = require('../contexts/patch').PatchContext;
var ReverseContext = require('../contexts/reverse').ReverseContext;

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

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

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

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

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

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

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

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

exports.collectChildrenDiffFilter = collectChildrenDiffFilter;
exports.objectsDiffFilter = objectsDiffFilter;
exports.patchFilter = patchFilter;
exports.collectChildrenPatchFilter = collectChildrenPatchFilter;
exports.reverseFilter = reverseFilter;
exports.collectChildrenReverseFilter = collectChildrenReverseFilter;

},{"../contexts/diff":5,"../contexts/patch":6,"../contexts/reverse":7}],15:[function(require,module,exports){
/* global diff_match_patch */
var TEXT_DIFF = 2;
var DEFAULT_MIN_LENGTH = 60;
var cachedDiffPatch = null;

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

  if (!cachedDiffPatch) {
    var instance;
    if (typeof diff_match_patch !== 'undefined') {
      // already loaded, probably a browser
      instance = typeof diff_match_patch === 'function' ?
        new diff_match_patch() : new diff_match_patch.diff_match_patch();
    } else if (typeof require === 'function') {
      try {
        var dmpModuleName = 'diff_match_patch_uncompressed';
        var dmp = require('../../public/external/' + dmpModuleName);
        instance = new dmp.diff_match_patch();
      } catch (err) {
        instance = null;
      }
    }
    if (!instance) {
      if (!required) {
        return null;
      }
      var error = new Error('text diff_match_patch library not found');
      error.diff_match_patch_not_found = true;
      throw error;
    }
    cachedDiffPatch = {
      diff: function(txt1, txt2) {
        return instance.patch_toText(instance.patch_make(txt1, txt2));
      },
      patch: function(txt1, patch) {
        var results = instance.patch_apply(instance.patch_fromText(patch), txt1);
        for (var i = 0; i < results[1].length; i++) {
          if (!results[1][i]) {
            var error = new Error('text patch failed');
            error.textPatchFailed = true;
          }
        }
        return results[0];
      }
    };
  }
  return cachedDiffPatch;
};

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

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

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

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

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

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

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

exports.diffFilter = diffFilter;
exports.patchFilter = patchFilter;
exports.reverseFilter = reverseFilter;

},{}],16:[function(require,module,exports){
var isArray = (typeof Array.isArray === 'function') ?
  // use native function
  Array.isArray :
  // use instanceof operator
  function(a) {
    return a instanceof Array;
  };

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

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

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

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

exports.diffFilter = diffFilter;
exports.patchFilter = patchFilter;
exports.reverseFilter = reverseFilter;

},{}],17:[function(require,module,exports){

var environment = require('./environment');

var DiffPatcher = require('./diffpatcher').DiffPatcher;
exports.DiffPatcher = DiffPatcher;

exports.create = function(options){
  return new DiffPatcher(options);
};

exports.dateReviver = require('./date-reviver');

var defaultInstance;

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

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

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

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

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


if (environment.isBrowser) {
  exports.homepage = 'https://github.com/benjamine/jsondiffpatch';
  exports.version = '0.2.4';
} else {
  var packageInfoModuleName = '../package.json';
  var packageInfo = require(packageInfoModuleName);
  exports.homepage = packageInfo.homepage;
  exports.version = packageInfo.version;

  var formatterModuleName = './formatters';
  var formatters = require(formatterModuleName);
  exports.formatters = formatters;
  // shortcut for console
  exports.console = formatters.console;
}

},{"./date-reviver":8,"./diffpatcher":9,"./environment":10}],18:[function(require,module,exports){
var Pipe = function Pipe(name) {
  this.name = name;
  this.filters = [];
};

Pipe.prototype.process = function(input) {
  if (!this.processor) {
    throw new Error('add this pipe to a processor before using it');
  }
  var debug = this.debug;
  var length = this.filters.length;
  var context = input;
  for (var index = 0; index < length; index++) {
    var filter = this.filters[index];
    if (debug) {
      this.log('filter: ' + filter.filterName);
    }
    filter(context);
    if (typeof context === 'object' && context.exiting) {
      context.exiting = false;
      break;
    }
  }
  if (!context.next && this.resultCheck) {
    this.resultCheck(context);
  }
};

Pipe.prototype.log = function(msg) {
  console.log('[jsondiffpatch] ' + this.name + ' pipe, ' + msg);
};

Pipe.prototype.append = function() {
  this.filters.push.apply(this.filters, arguments);
  return this;
};

Pipe.prototype.prepend = function() {
  this.filters.unshift.apply(this.filters, arguments);
  return this;
};

Pipe.prototype.indexOf = function(filterName) {
  if (!filterName) {
    throw new Error('a filter name is required');
  }
  for (var index = 0; index < this.filters.length; index++) {
    var filter = this.filters[index];
    if (filter.filterName === filterName) {
      return index;
    }
  }
  throw new Error('filter not found: ' + filterName);
};

Pipe.prototype.list = function() {
  var names = [];
  for (var index = 0; index < this.filters.length; index++) {
    var filter = this.filters[index];
    names.push(filter.filterName);
  }
  return names;
};

Pipe.prototype.after = function(filterName) {
  var index = this.indexOf(filterName);
  var params = Array.prototype.slice.call(arguments, 1);
  if (!params.length) {
    throw new Error('a filter is required');
  }
  params.unshift(index + 1, 0);
  Array.prototype.splice.apply(this.filters, params);
  return this;
};

Pipe.prototype.before = function(filterName) {
  var index = this.indexOf(filterName);
  var params = Array.prototype.slice.call(arguments, 1);
  if (!params.length) {
    throw new Error('a filter is required');
  }
  params.unshift(index, 0);
  Array.prototype.splice.apply(this.filters, params);
  return this;
};

Pipe.prototype.clear = function() {
  this.filters.length = 0;
  return this;
};

Pipe.prototype.shouldHaveResult = function(should) {
  if (should === false) {
    this.resultCheck = null;
    return;
  }
  if (this.resultCheck) {
    return;
  }
  var pipe = this;
  this.resultCheck = function(context) {
    if (!context.hasResult) {
      console.log(context);
      var error = new Error(pipe.name + ' failed');
      error.noResult = true;
      throw error;
    }
  };
  return this;
};

exports.Pipe = Pipe;

},{}],19:[function(require,module,exports){

var Processor = function Processor(options){
  this.selfOptions = options || {};
  this.pipes = {};
};

Processor.prototype.options = function(options) {
  if (options) {
    this.selfOptions = options;
  }
  return this.selfOptions;
};

Processor.prototype.pipe = function(name, pipe) {
  if (typeof name === 'string') {
    if (typeof pipe === 'undefined') {
      return this.pipes[name];
    } else {
      this.pipes[name] = pipe;
    }
  }
  if (name && name.name) {
    pipe = name;
    if (pipe.processor === this) { return pipe; }
    this.pipes[pipe.name] = pipe;
  }
  pipe.processor = this;
  return pipe;
};

Processor.prototype.process = function(input, pipe) {
  var context = input;
  context.options = this.options();
  var nextPipe = pipe || input.pipe || 'default';
  var lastPipe, lastContext;
  while (nextPipe) {
    if (typeof context.nextAfterChildren !== 'undefined') {
      // children processed and coming back to parent
      context.next = context.nextAfterChildren;
      context.nextAfterChildren = null;
    }

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

exports.Processor = Processor;

},{}]},{},[1])(1)
});
//# 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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","var environment = require('./environment');\n\nif (environment.isBrowser) {\n  /* global window */\n  /* jshint camelcase: false */\n  window.diff_match_patch = require('../public/external/diff_match_patch_uncompressed');\n  /* jshint camelcase: true */\n}\n\nmodule.exports = require('./main');\n","/**\n * Diff Match and Patch\n *\n * Copyright 2006 Google Inc.\n * http://code.google.com/p/google-diff-match-patch/\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * @fileoverview Computes the difference between two texts to create a patch.\n * Applies the patch onto another text, allowing for errors.\n * @author fraser@google.com (Neil Fraser)\n */\n\n/**\n * Class containing the diff, match and patch methods.\n * @constructor\n */\nfunction diff_match_patch() {\n\n  // Defaults.\n  // Redefine these in your program to override the defaults.\n\n  // Number of seconds to map a diff before giving up (0 for infinity).\n  this.Diff_Timeout = 1.0;\n  // Cost of an empty edit operation in terms of edit characters.\n  this.Diff_EditCost = 4;\n  // At what point is no match declared (0.0 = perfection, 1.0 = very loose).\n  this.Match_Threshold = 0.5;\n  // How far to search for a match (0 = exact location, 1000+ = broad match).\n  // A match this many characters away from the expected location will add\n  // 1.0 to the score (0.0 is a perfect match).\n  this.Match_Distance = 1000;\n  // When deleting a large block of text (over ~64 characters), how close does\n  // the contents have to match the expected contents. (0.0 = perfection,\n  // 1.0 = very loose).  Note that Match_Threshold controls how closely the\n  // end points of a delete need to match.\n  this.Patch_DeleteThreshold = 0.5;\n  // Chunk size for context length.\n  this.Patch_Margin = 4;\n\n  // The number of bits in an int.\n  this.Match_MaxBits = 32;\n}\n\n\n//  DIFF FUNCTIONS\n\n\n/**\n * The data structure representing a diff is an array of tuples:\n * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']]\n * which means: delete 'Hello', add 'Goodbye' and keep ' world.'\n */\nvar DIFF_DELETE = -1;\nvar DIFF_INSERT = 1;\nvar DIFF_EQUAL = 0;\n\n/** @typedef {!Array.<number|string>} */\ndiff_match_patch.Diff;\n\n\n/**\n * Find the differences between two texts.  Simplifies the problem by stripping\n * any common prefix or suffix off the texts before diffing.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {boolean=} opt_checklines Optional speedup flag. If present and false,\n *     then don't run a line-level diff first to identify the changed areas.\n *     Defaults to true, which does a faster, slightly less optimal diff.\n * @param {number} opt_deadline Optional time when the diff should be complete\n *     by.  Used internally for recursive calls.  Users should set DiffTimeout\n *     instead.\n * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.\n */\ndiff_match_patch.prototype.diff_main = function(text1, text2, opt_checklines,\n    opt_deadline) {\n  // Set a deadline by which time the diff must be complete.\n  if (typeof opt_deadline == 'undefined') {\n    if (this.Diff_Timeout <= 0) {\n      opt_deadline = Number.MAX_VALUE;\n    } else {\n      opt_deadline = (new Date).getTime() + this.Diff_Timeout * 1000;\n    }\n  }\n  var deadline = opt_deadline;\n\n  // Check for null inputs.\n  if (text1 == null || text2 == null) {\n    throw new Error('Null input. (diff_main)');\n  }\n\n  // Check for equality (speedup).\n  if (text1 == text2) {\n    if (text1) {\n      return [[DIFF_EQUAL, text1]];\n    }\n    return [];\n  }\n\n  if (typeof opt_checklines == 'undefined') {\n    opt_checklines = true;\n  }\n  var checklines = opt_checklines;\n\n  // Trim off common prefix (speedup).\n  var commonlength = this.diff_commonPrefix(text1, text2);\n  var commonprefix = text1.substring(0, commonlength);\n  text1 = text1.substring(commonlength);\n  text2 = text2.substring(commonlength);\n\n  // Trim off common suffix (speedup).\n  commonlength = this.diff_commonSuffix(text1, text2);\n  var commonsuffix = text1.substring(text1.length - commonlength);\n  text1 = text1.substring(0, text1.length - commonlength);\n  text2 = text2.substring(0, text2.length - commonlength);\n\n  // Compute the diff on the middle block.\n  var diffs = this.diff_compute_(text1, text2, checklines, deadline);\n\n  // Restore the prefix and suffix.\n  if (commonprefix) {\n    diffs.unshift([DIFF_EQUAL, commonprefix]);\n  }\n  if (commonsuffix) {\n    diffs.push([DIFF_EQUAL, commonsuffix]);\n  }\n  this.diff_cleanupMerge(diffs);\n  return diffs;\n};\n\n\n/**\n * Find the differences between two texts.  Assumes that the texts do not\n * have any common prefix or suffix.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {boolean} checklines Speedup flag.  If false, then don't run a\n *     line-level diff first to identify the changed areas.\n *     If true, then run a faster, slightly less optimal diff.\n * @param {number} deadline Time when the diff should be complete by.\n * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.\n * @private\n */\ndiff_match_patch.prototype.diff_compute_ = function(text1, text2, checklines,\n    deadline) {\n  var diffs;\n\n  if (!text1) {\n    // Just add some text (speedup).\n    return [[DIFF_INSERT, text2]];\n  }\n\n  if (!text2) {\n    // Just delete some text (speedup).\n    return [[DIFF_DELETE, text1]];\n  }\n\n  var longtext = text1.length > text2.length ? text1 : text2;\n  var shorttext = text1.length > text2.length ? text2 : text1;\n  var i = longtext.indexOf(shorttext);\n  if (i != -1) {\n    // Shorter text is inside the longer text (speedup).\n    diffs = [[DIFF_INSERT, longtext.substring(0, i)],\n             [DIFF_EQUAL, shorttext],\n             [DIFF_INSERT, longtext.substring(i + shorttext.length)]];\n    // Swap insertions for deletions if diff is reversed.\n    if (text1.length > text2.length) {\n      diffs[0][0] = diffs[2][0] = DIFF_DELETE;\n    }\n    return diffs;\n  }\n\n  if (shorttext.length == 1) {\n    // Single character string.\n    // After the previous speedup, the character can't be an equality.\n    return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];\n  }\n  longtext = shorttext = null;  // Garbage collect.\n\n  // Check to see if the problem can be split in two.\n  var hm = this.diff_halfMatch_(text1, text2);\n  if (hm) {\n    // A half-match was found, sort out the return data.\n    var text1_a = hm[0];\n    var text1_b = hm[1];\n    var text2_a = hm[2];\n    var text2_b = hm[3];\n    var mid_common = hm[4];\n    // Send both pairs off for separate processing.\n    var diffs_a = this.diff_main(text1_a, text2_a, checklines, deadline);\n    var diffs_b = this.diff_main(text1_b, text2_b, checklines, deadline);\n    // Merge the results.\n    return diffs_a.concat([[DIFF_EQUAL, mid_common]], diffs_b);\n  }\n\n  if (checklines && text1.length > 100 && text2.length > 100) {\n    return this.diff_lineMode_(text1, text2, deadline);\n  }\n\n  return this.diff_bisect_(text1, text2, deadline);\n};\n\n\n/**\n * Do a quick line-level diff on both strings, then rediff the parts for\n * greater accuracy.\n * This speedup can produce non-minimal diffs.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {number} deadline Time when the diff should be complete by.\n * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.\n * @private\n */\ndiff_match_patch.prototype.diff_lineMode_ = function(text1, text2, deadline) {\n  // Scan the text on a line-by-line basis first.\n  var a = this.diff_linesToChars_(text1, text2);\n  text1 = /** @type {string} */(a[0]);\n  text2 = /** @type {string} */(a[1]);\n  var linearray = /** @type {!Array.<string>} */(a[2]);\n\n  var diffs = this.diff_bisect_(text1, text2, deadline);\n\n  // Convert the diff back to original text.\n  this.diff_charsToLines_(diffs, linearray);\n  // Eliminate freak matches (e.g. blank lines)\n  this.diff_cleanupSemantic(diffs);\n\n  // Rediff any replacement blocks, this time character-by-character.\n  // Add a dummy entry at the end.\n  diffs.push([DIFF_EQUAL, '']);\n  var pointer = 0;\n  var count_delete = 0;\n  var count_insert = 0;\n  var text_delete = '';\n  var text_insert = '';\n  while (pointer < diffs.length) {\n    switch (diffs[pointer][0]) {\n      case DIFF_INSERT:\n        count_insert++;\n        text_insert += diffs[pointer][1];\n        break;\n      case DIFF_DELETE:\n        count_delete++;\n        text_delete += diffs[pointer][1];\n        break;\n      case DIFF_EQUAL:\n        // Upon reaching an equality, check for prior redundancies.\n        if (count_delete >= 1 && count_insert >= 1) {\n          // Delete the offending records and add the merged ones.\n          var a = this.diff_main(text_delete, text_insert, false, deadline);\n          diffs.splice(pointer - count_delete - count_insert,\n                       count_delete + count_insert);\n          pointer = pointer - count_delete - count_insert;\n          for (var j = a.length - 1; j >= 0; j--) {\n            diffs.splice(pointer, 0, a[j]);\n          }\n          pointer = pointer + a.length;\n        }\n        count_insert = 0;\n        count_delete = 0;\n        text_delete = '';\n        text_insert = '';\n        break;\n    }\n    pointer++;\n  }\n  diffs.pop();  // Remove the dummy entry at the end.\n\n  return diffs;\n};\n\n\n/**\n * Find the 'middle snake' of a diff, split the problem in two\n * and return the recursively constructed diff.\n * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {number} deadline Time at which to bail if not yet complete.\n * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.\n * @private\n */\ndiff_match_patch.prototype.diff_bisect_ = function(text1, text2, deadline) {\n  // Cache the text lengths to prevent multiple calls.\n  var text1_length = text1.length;\n  var text2_length = text2.length;\n  var max_d = Math.ceil((text1_length + text2_length) / 2);\n  var v_offset = max_d;\n  var v_length = 2 * max_d;\n  var v1 = new Array(v_length);\n  var v2 = new Array(v_length);\n  // Setting all elements to -1 is faster in Chrome & Firefox than mixing\n  // integers and undefined.\n  for (var x = 0; x < v_length; x++) {\n    v1[x] = -1;\n    v2[x] = -1;\n  }\n  v1[v_offset + 1] = 0;\n  v2[v_offset + 1] = 0;\n  var delta = text1_length - text2_length;\n  // If the total number of characters is odd, then the front path will collide\n  // with the reverse path.\n  var front = (delta % 2 != 0);\n  // Offsets for start and end of k loop.\n  // Prevents mapping of space beyond the grid.\n  var k1start = 0;\n  var k1end = 0;\n  var k2start = 0;\n  var k2end = 0;\n  for (var d = 0; d < max_d; d++) {\n    // Bail out if deadline is reached.\n    if ((new Date()).getTime() > deadline) {\n      break;\n    }\n\n    // Walk the front path one step.\n    for (var k1 = -d + k1start; k1 <= d - k1end; k1 += 2) {\n      var k1_offset = v_offset + k1;\n      var x1;\n      if (k1 == -d || k1 != d && v1[k1_offset - 1] < v1[k1_offset + 1]) {\n        x1 = v1[k1_offset + 1];\n      } else {\n        x1 = v1[k1_offset - 1] + 1;\n      }\n      var y1 = x1 - k1;\n      while (x1 < text1_length && y1 < text2_length &&\n             text1.charAt(x1) == text2.charAt(y1)) {\n        x1++;\n        y1++;\n      }\n      v1[k1_offset] = x1;\n      if (x1 > text1_length) {\n        // Ran off the right of the graph.\n        k1end += 2;\n      } else if (y1 > text2_length) {\n        // Ran off the bottom of the graph.\n        k1start += 2;\n      } else if (front) {\n        var k2_offset = v_offset + delta - k1;\n        if (k2_offset >= 0 && k2_offset < v_length && v2[k2_offset] != -1) {\n          // Mirror x2 onto top-left coordinate system.\n          var x2 = text1_length - v2[k2_offset];\n          if (x1 >= x2) {\n            // Overlap detected.\n            return this.diff_bisectSplit_(text1, text2, x1, y1, deadline);\n          }\n        }\n      }\n    }\n\n    // Walk the reverse path one step.\n    for (var k2 = -d + k2start; k2 <= d - k2end; k2 += 2) {\n      var k2_offset = v_offset + k2;\n      var x2;\n      if (k2 == -d || k2 != d && v2[k2_offset - 1] < v2[k2_offset + 1]) {\n        x2 = v2[k2_offset + 1];\n      } else {\n        x2 = v2[k2_offset - 1] + 1;\n      }\n      var y2 = x2 - k2;\n      while (x2 < text1_length && y2 < text2_length &&\n             text1.charAt(text1_length - x2 - 1) ==\n             text2.charAt(text2_length - y2 - 1)) {\n        x2++;\n        y2++;\n      }\n      v2[k2_offset] = x2;\n      if (x2 > text1_length) {\n        // Ran off the left of the graph.\n        k2end += 2;\n      } else if (y2 > text2_length) {\n        // Ran off the top of the graph.\n        k2start += 2;\n      } else if (!front) {\n        var k1_offset = v_offset + delta - k2;\n        if (k1_offset >= 0 && k1_offset < v_length && v1[k1_offset] != -1) {\n          var x1 = v1[k1_offset];\n          var y1 = v_offset + x1 - k1_offset;\n          // Mirror x2 onto top-left coordinate system.\n          x2 = text1_length - x2;\n          if (x1 >= x2) {\n            // Overlap detected.\n            return this.diff_bisectSplit_(text1, text2, x1, y1, deadline);\n          }\n        }\n      }\n    }\n  }\n  // Diff took too long and hit the deadline or\n  // number of diffs equals number of characters, no commonality at all.\n  return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];\n};\n\n\n/**\n * Given the location of the 'middle snake', split the diff in two parts\n * and recurse.\n * @param {string} text1 Old string to be diffed.\n * @param {string} text2 New string to be diffed.\n * @param {number} x Index of split point in text1.\n * @param {number} y Index of split point in text2.\n * @param {number} deadline Time at which to bail if not yet complete.\n * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.\n * @private\n */\ndiff_match_patch.prototype.diff_bisectSplit_ = function(text1, text2, x, y,\n    deadline) {\n  var text1a = text1.substring(0, x);\n  var text2a = text2.substring(0, y);\n  var text1b = text1.substring(x);\n  var text2b = text2.substring(y);\n\n  // Compute both diffs serially.\n  var diffs = this.diff_main(text1a, text2a, false, deadline);\n  var diffsb = this.diff_main(text1b, text2b, false, deadline);\n\n  return diffs.concat(diffsb);\n};\n\n\n/**\n * Split two texts into an array of strings.  Reduce the texts to a string of\n * hashes where each Unicode character represents one line.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {!Array.<string|!Array.<string>>} Three element Array, containing the\n *     encoded text1, the encoded text2 and the array of unique strings.  The\n *     zeroth element of the array of unique strings is intentionally blank.\n * @private\n */\ndiff_match_patch.prototype.diff_linesToChars_ = function(text1, text2) {\n  var lineArray = [];  // e.g. lineArray[4] == 'Hello\\n'\n  var lineHash = {};   // e.g. lineHash['Hello\\n'] == 4\n\n  // '\\x00' is a valid character, but various debuggers don't like it.\n  // So we'll insert a junk entry to avoid generating a null character.\n  lineArray[0] = '';\n\n  /**\n   * Split a text into an array of strings.  Reduce the texts to a string of\n   * hashes where each Unicode character represents one line.\n   * Modifies linearray and linehash through being a closure.\n   * @param {string} text String to encode.\n   * @return {string} Encoded string.\n   * @private\n   */\n  function diff_linesToCharsMunge_(text) {\n    var chars = '';\n    // Walk the text, pulling out a substring for each line.\n    // text.split('\\n') would would temporarily double our memory footprint.\n    // Modifying text would create many large strings to garbage collect.\n    var lineStart = 0;\n    var lineEnd = -1;\n    // Keeping our own length variable is faster than looking it up.\n    var lineArrayLength = lineArray.length;\n    while (lineEnd < text.length - 1) {\n      lineEnd = text.indexOf('\\n', lineStart);\n      if (lineEnd == -1) {\n        lineEnd = text.length - 1;\n      }\n      var line = text.substring(lineStart, lineEnd + 1);\n      lineStart = lineEnd + 1;\n\n      if (lineHash.hasOwnProperty ? lineHash.hasOwnProperty(line) :\n          (lineHash[line] !== undefined)) {\n        chars += String.fromCharCode(lineHash[line]);\n      } else {\n        chars += String.fromCharCode(lineArrayLength);\n        lineHash[line] = lineArrayLength;\n        lineArray[lineArrayLength++] = line;\n      }\n    }\n    return chars;\n  }\n\n  var chars1 = diff_linesToCharsMunge_(text1);\n  var chars2 = diff_linesToCharsMunge_(text2);\n  return [chars1, chars2, lineArray];\n};\n\n\n/**\n * Rehydrate the text in a diff from a string of line hashes to real lines of\n * text.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @param {!Array.<string>} lineArray Array of unique strings.\n * @private\n */\ndiff_match_patch.prototype.diff_charsToLines_ = function(diffs, lineArray) {\n  for (var x = 0; x < diffs.length; x++) {\n    var chars = diffs[x][1];\n    var text = [];\n    for (var y = 0; y < chars.length; y++) {\n      text[y] = lineArray[chars.charCodeAt(y)];\n    }\n    diffs[x][1] = text.join('');\n  }\n};\n\n\n/**\n * Determine the common prefix of two strings.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {number} The number of characters common to the start of each\n *     string.\n */\ndiff_match_patch.prototype.diff_commonPrefix = function(text1, text2) {\n  // Quick check for common null cases.\n  if (!text1 || !text2 || text1.charAt(0) != text2.charAt(0)) {\n    return 0;\n  }\n  // Binary search.\n  // Performance analysis: http://neil.fraser.name/news/2007/10/09/\n  var pointermin = 0;\n  var pointermax = Math.min(text1.length, text2.length);\n  var pointermid = pointermax;\n  var pointerstart = 0;\n  while (pointermin < pointermid) {\n    if (text1.substring(pointerstart, pointermid) ==\n        text2.substring(pointerstart, pointermid)) {\n      pointermin = pointermid;\n      pointerstart = pointermin;\n    } else {\n      pointermax = pointermid;\n    }\n    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);\n  }\n  return pointermid;\n};\n\n\n/**\n * Determine the common suffix of two strings.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {number} The number of characters common to the end of each string.\n */\ndiff_match_patch.prototype.diff_commonSuffix = function(text1, text2) {\n  // Quick check for common null cases.\n  if (!text1 || !text2 ||\n      text1.charAt(text1.length - 1) != text2.charAt(text2.length - 1)) {\n    return 0;\n  }\n  // Binary search.\n  // Performance analysis: http://neil.fraser.name/news/2007/10/09/\n  var pointermin = 0;\n  var pointermax = Math.min(text1.length, text2.length);\n  var pointermid = pointermax;\n  var pointerend = 0;\n  while (pointermin < pointermid) {\n    if (text1.substring(text1.length - pointermid, text1.length - pointerend) ==\n        text2.substring(text2.length - pointermid, text2.length - pointerend)) {\n      pointermin = pointermid;\n      pointerend = pointermin;\n    } else {\n      pointermax = pointermid;\n    }\n    pointermid = Math.floor((pointermax - pointermin) / 2 + pointermin);\n  }\n  return pointermid;\n};\n\n\n/**\n * Determine if the suffix of one string is the prefix of another.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {number} The number of characters common to the end of the first\n *     string and the start of the second string.\n * @private\n */\ndiff_match_patch.prototype.diff_commonOverlap_ = function(text1, text2) {\n  // Cache the text lengths to prevent multiple calls.\n  var text1_length = text1.length;\n  var text2_length = text2.length;\n  // Eliminate the null case.\n  if (text1_length == 0 || text2_length == 0) {\n    return 0;\n  }\n  // Truncate the longer string.\n  if (text1_length > text2_length) {\n    text1 = text1.substring(text1_length - text2_length);\n  } else if (text1_length < text2_length) {\n    text2 = text2.substring(0, text1_length);\n  }\n  var text_length = Math.min(text1_length, text2_length);\n  // Quick check for the worst case.\n  if (text1 == text2) {\n    return text_length;\n  }\n\n  // Start by looking for a single character match\n  // and increase length until no match is found.\n  // Performance analysis: http://neil.fraser.name/news/2010/11/04/\n  var best = 0;\n  var length = 1;\n  while (true) {\n    var pattern = text1.substring(text_length - length);\n    var found = text2.indexOf(pattern);\n    if (found == -1) {\n      return best;\n    }\n    length += found;\n    if (found == 0 || text1.substring(text_length - length) ==\n        text2.substring(0, length)) {\n      best = length;\n      length++;\n    }\n  }\n};\n\n\n/**\n * Do the two texts share a substring which is at least half the length of the\n * longer text?\n * This speedup can produce non-minimal diffs.\n * @param {string} text1 First string.\n * @param {string} text2 Second string.\n * @return {Array.<string>} Five element Array, containing the prefix of\n *     text1, the suffix of text1, the prefix of text2, the suffix of\n *     text2 and the common middle.  Or null if there was no match.\n * @private\n */\ndiff_match_patch.prototype.diff_halfMatch_ = function(text1, text2) {\n  if (this.Diff_Timeout <= 0) {\n    // Don't risk returning a non-optimal diff if we have unlimited time.\n    return null;\n  }\n  var longtext = text1.length > text2.length ? text1 : text2;\n  var shorttext = text1.length > text2.length ? text2 : text1;\n  if (longtext.length < 4 || shorttext.length * 2 < longtext.length) {\n    return null;  // Pointless.\n  }\n  var dmp = this;  // 'this' becomes 'window' in a closure.\n\n  /**\n   * Does a substring of shorttext exist within longtext such that the substring\n   * is at least half the length of longtext?\n   * Closure, but does not reference any external variables.\n   * @param {string} longtext Longer string.\n   * @param {string} shorttext Shorter string.\n   * @param {number} i Start index of quarter length substring within longtext.\n   * @return {Array.<string>} Five element Array, containing the prefix of\n   *     longtext, the suffix of longtext, the prefix of shorttext, the suffix\n   *     of shorttext and the common middle.  Or null if there was no match.\n   * @private\n   */\n  function diff_halfMatchI_(longtext, shorttext, i) {\n    // Start with a 1/4 length substring at position i as a seed.\n    var seed = longtext.substring(i, i + Math.floor(longtext.length / 4));\n    var j = -1;\n    var best_common = '';\n    var best_longtext_a, best_longtext_b, best_shorttext_a, best_shorttext_b;\n    while ((j = shorttext.indexOf(seed, j + 1)) != -1) {\n      var prefixLength = dmp.diff_commonPrefix(longtext.substring(i),\n                                               shorttext.substring(j));\n      var suffixLength = dmp.diff_commonSuffix(longtext.substring(0, i),\n                                               shorttext.substring(0, j));\n      if (best_common.length < suffixLength + prefixLength) {\n        best_common = shorttext.substring(j - suffixLength, j) +\n            shorttext.substring(j, j + prefixLength);\n        best_longtext_a = longtext.substring(0, i - suffixLength);\n        best_longtext_b = longtext.substring(i + prefixLength);\n        best_shorttext_a = shorttext.substring(0, j - suffixLength);\n        best_shorttext_b = shorttext.substring(j + prefixLength);\n      }\n    }\n    if (best_common.length * 2 >= longtext.length) {\n      return [best_longtext_a, best_longtext_b,\n              best_shorttext_a, best_shorttext_b, best_common];\n    } else {\n      return null;\n    }\n  }\n\n  // First check if the second quarter is the seed for a half-match.\n  var hm1 = diff_halfMatchI_(longtext, shorttext,\n                             Math.ceil(longtext.length / 4));\n  // Check again based on the third quarter.\n  var hm2 = diff_halfMatchI_(longtext, shorttext,\n                             Math.ceil(longtext.length / 2));\n  var hm;\n  if (!hm1 && !hm2) {\n    return null;\n  } else if (!hm2) {\n    hm = hm1;\n  } else if (!hm1) {\n    hm = hm2;\n  } else {\n    // Both matched.  Select the longest.\n    hm = hm1[4].length > hm2[4].length ? hm1 : hm2;\n  }\n\n  // A half-match was found, sort out the return data.\n  var text1_a, text1_b, text2_a, text2_b;\n  if (text1.length > text2.length) {\n    text1_a = hm[0];\n    text1_b = hm[1];\n    text2_a = hm[2];\n    text2_b = hm[3];\n  } else {\n    text2_a = hm[0];\n    text2_b = hm[1];\n    text1_a = hm[2];\n    text1_b = hm[3];\n  }\n  var mid_common = hm[4];\n  return [text1_a, text1_b, text2_a, text2_b, mid_common];\n};\n\n\n/**\n * Reduce the number of edits by eliminating semantically trivial equalities.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n */\ndiff_match_patch.prototype.diff_cleanupSemantic = function(diffs) {\n  var changes = false;\n  var equalities = [];  // Stack of indices where equalities are found.\n  var equalitiesLength = 0;  // Keeping our own length var is faster in JS.\n  /** @type {?string} */\n  var lastequality = null;  // Always equal to equalities[equalitiesLength-1][1]\n  var pointer = 0;  // Index of current position.\n  // Number of characters that changed prior to the equality.\n  var length_insertions1 = 0;\n  var length_deletions1 = 0;\n  // Number of characters that changed after the equality.\n  var length_insertions2 = 0;\n  var length_deletions2 = 0;\n  while (pointer < diffs.length) {\n    if (diffs[pointer][0] == DIFF_EQUAL) {  // Equality found.\n      equalities[equalitiesLength++] = pointer;\n      length_insertions1 = length_insertions2;\n      length_deletions1 = length_deletions2;\n      length_insertions2 = 0;\n      length_deletions2 = 0;\n      lastequality = /** @type {string} */(diffs[pointer][1]);\n    } else {  // An insertion or deletion.\n      if (diffs[pointer][0] == DIFF_INSERT) {\n        length_insertions2 += diffs[pointer][1].length;\n      } else {\n        length_deletions2 += diffs[pointer][1].length;\n      }\n      // Eliminate an equality that is smaller or equal to the edits on both\n      // sides of it.\n      if (lastequality !== null && (lastequality.length <=\n          Math.max(length_insertions1, length_deletions1)) &&\n          (lastequality.length <= Math.max(length_insertions2,\n                                           length_deletions2))) {\n        // Duplicate record.\n        diffs.splice(equalities[equalitiesLength - 1], 0,\n                     [DIFF_DELETE, lastequality]);\n        // Change second copy to insert.\n        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;\n        // Throw away the equality we just deleted.\n        equalitiesLength--;\n        // Throw away the previous equality (it needs to be reevaluated).\n        equalitiesLength--;\n        pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;\n        length_insertions1 = 0;  // Reset the counters.\n        length_deletions1 = 0;\n        length_insertions2 = 0;\n        length_deletions2 = 0;\n        lastequality = null;\n        changes = true;\n      }\n    }\n    pointer++;\n  }\n\n  // Normalize the diff.\n  if (changes) {\n    this.diff_cleanupMerge(diffs);\n  }\n  this.diff_cleanupSemanticLossless(diffs);\n\n  // Find any overlaps between deletions and insertions.\n  // e.g: <del>abcxxx</del><ins>xxxdef</ins>\n  //   -> <del>abc</del>xxx<ins>def</ins>\n  // Only extract an overlap if it is as big as the edit ahead or behind it.\n  pointer = 1;\n  while (pointer < diffs.length) {\n    if (diffs[pointer - 1][0] == DIFF_DELETE &&\n        diffs[pointer][0] == DIFF_INSERT) {\n      var deletion = /** @type {string} */(diffs[pointer - 1][1]);\n      var insertion = /** @type {string} */(diffs[pointer][1]);\n      var overlap_length = this.diff_commonOverlap_(deletion, insertion);\n      if (overlap_length >= deletion.length / 2 ||\n          overlap_length >= insertion.length / 2) {\n        // Overlap found.  Insert an equality and trim the surrounding edits.\n        diffs.splice(pointer, 0,\n            [DIFF_EQUAL, insertion.substring(0, overlap_length)]);\n        diffs[pointer - 1][1] =\n            deletion.substring(0, deletion.length - overlap_length);\n        diffs[pointer + 1][1] = insertion.substring(overlap_length);\n        pointer++;\n      }\n      pointer++;\n    }\n    pointer++;\n  }\n};\n\n\n/**\n * Look for single edits surrounded on both sides by equalities\n * which can be shifted sideways to align the edit to a word boundary.\n * e.g: The c<ins>at c</ins>ame. -> The <ins>cat </ins>came.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n */\ndiff_match_patch.prototype.diff_cleanupSemanticLossless = function(diffs) {\n  // Define some regex patterns for matching boundaries.\n  var punctuation = /[^a-zA-Z0-9]/;\n  var whitespace = /\\s/;\n  var linebreak = /[\\r\\n]/;\n  var blanklineEnd = /\\n\\r?\\n$/;\n  var blanklineStart = /^\\r?\\n\\r?\\n/;\n\n  /**\n   * Given two strings, compute a score representing whether the internal\n   * boundary falls on logical boundaries.\n   * Scores range from 5 (best) to 0 (worst).\n   * Closure, makes reference to regex patterns defined above.\n   * @param {string} one First string.\n   * @param {string} two Second string.\n   * @return {number} The score.\n   * @private\n   */\n  function diff_cleanupSemanticScore_(one, two) {\n    if (!one || !two) {\n      // Edges are the best.\n      return 5;\n    }\n\n    // Each port of this function behaves slightly differently due to\n    // subtle differences in each language's definition of things like\n    // 'whitespace'.  Since this function's purpose is largely cosmetic,\n    // the choice has been made to use each language's native features\n    // rather than force total conformity.\n    var score = 0;\n    // One point for non-alphanumeric.\n    if (one.charAt(one.length - 1).match(punctuation) ||\n        two.charAt(0).match(punctuation)) {\n      score++;\n      // Two points for whitespace.\n      if (one.charAt(one.length - 1).match(whitespace) ||\n          two.charAt(0).match(whitespace)) {\n        score++;\n        // Three points for line breaks.\n        if (one.charAt(one.length - 1).match(linebreak) ||\n            two.charAt(0).match(linebreak)) {\n          score++;\n          // Four points for blank lines.\n          if (one.match(blanklineEnd) || two.match(blanklineStart)) {\n            score++;\n          }\n        }\n      }\n    }\n    return score;\n  }\n\n  var pointer = 1;\n  // Intentionally ignore the first and last element (don't need checking).\n  while (pointer < diffs.length - 1) {\n    if (diffs[pointer - 1][0] == DIFF_EQUAL &&\n        diffs[pointer + 1][0] == DIFF_EQUAL) {\n      // This is a single edit surrounded by equalities.\n      var equality1 = /** @type {string} */(diffs[pointer - 1][1]);\n      var edit = /** @type {string} */(diffs[pointer][1]);\n      var equality2 = /** @type {string} */(diffs[pointer + 1][1]);\n\n      // First, shift the edit as far left as possible.\n      var commonOffset = this.diff_commonSuffix(equality1, edit);\n      if (commonOffset) {\n        var commonString = edit.substring(edit.length - commonOffset);\n        equality1 = equality1.substring(0, equality1.length - commonOffset);\n        edit = commonString + edit.substring(0, edit.length - commonOffset);\n        equality2 = commonString + equality2;\n      }\n\n      // Second, step character by character right, looking for the best fit.\n      var bestEquality1 = equality1;\n      var bestEdit = edit;\n      var bestEquality2 = equality2;\n      var bestScore = diff_cleanupSemanticScore_(equality1, edit) +\n          diff_cleanupSemanticScore_(edit, equality2);\n      while (edit.charAt(0) === equality2.charAt(0)) {\n        equality1 += edit.charAt(0);\n        edit = edit.substring(1) + equality2.charAt(0);\n        equality2 = equality2.substring(1);\n        var score = diff_cleanupSemanticScore_(equality1, edit) +\n            diff_cleanupSemanticScore_(edit, equality2);\n        // The >= encourages trailing rather than leading whitespace on edits.\n        if (score >= bestScore) {\n          bestScore = score;\n          bestEquality1 = equality1;\n          bestEdit = edit;\n          bestEquality2 = equality2;\n        }\n      }\n\n      if (diffs[pointer - 1][1] != bestEquality1) {\n        // We have an improvement, save it back to the diff.\n        if (bestEquality1) {\n          diffs[pointer - 1][1] = bestEquality1;\n        } else {\n          diffs.splice(pointer - 1, 1);\n          pointer--;\n        }\n        diffs[pointer][1] = bestEdit;\n        if (bestEquality2) {\n          diffs[pointer + 1][1] = bestEquality2;\n        } else {\n          diffs.splice(pointer + 1, 1);\n          pointer--;\n        }\n      }\n    }\n    pointer++;\n  }\n};\n\n\n/**\n * Reduce the number of edits by eliminating operationally trivial equalities.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n */\ndiff_match_patch.prototype.diff_cleanupEfficiency = function(diffs) {\n  var changes = false;\n  var equalities = [];  // Stack of indices where equalities are found.\n  var equalitiesLength = 0;  // Keeping our own length var is faster in JS.\n  var lastequality = '';  // Always equal to equalities[equalitiesLength-1][1]\n  var pointer = 0;  // Index of current position.\n  // Is there an insertion operation before the last equality.\n  var pre_ins = false;\n  // Is there a deletion operation before the last equality.\n  var pre_del = false;\n  // Is there an insertion operation after the last equality.\n  var post_ins = false;\n  // Is there a deletion operation after the last equality.\n  var post_del = false;\n  while (pointer < diffs.length) {\n    if (diffs[pointer][0] == DIFF_EQUAL) {  // Equality found.\n      if (diffs[pointer][1].length < this.Diff_EditCost &&\n          (post_ins || post_del)) {\n        // Candidate found.\n        equalities[equalitiesLength++] = pointer;\n        pre_ins = post_ins;\n        pre_del = post_del;\n        lastequality = diffs[pointer][1];\n      } else {\n        // Not a candidate, and can never become one.\n        equalitiesLength = 0;\n        lastequality = '';\n      }\n      post_ins = post_del = false;\n    } else {  // An insertion or deletion.\n      if (diffs[pointer][0] == DIFF_DELETE) {\n        post_del = true;\n      } else {\n        post_ins = true;\n      }\n      /*\n       * Five types to be split:\n       * <ins>A</ins><del>B</del>XY<ins>C</ins><del>D</del>\n       * <ins>A</ins>X<ins>C</ins><del>D</del>\n       * <ins>A</ins><del>B</del>X<ins>C</ins>\n       * <ins>A</del>X<ins>C</ins><del>D</del>\n       * <ins>A</ins><del>B</del>X<del>C</del>\n       */\n      if (lastequality && ((pre_ins && pre_del && post_ins && post_del) ||\n                           ((lastequality.length < this.Diff_EditCost / 2) &&\n                            (pre_ins + pre_del + post_ins + post_del) == 3))) {\n        // Duplicate record.\n        diffs.splice(equalities[equalitiesLength - 1], 0,\n                     [DIFF_DELETE, lastequality]);\n        // Change second copy to insert.\n        diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;\n        equalitiesLength--;  // Throw away the equality we just deleted;\n        lastequality = '';\n        if (pre_ins && pre_del) {\n          // No changes made which could affect previous entry, keep going.\n          post_ins = post_del = true;\n          equalitiesLength = 0;\n        } else {\n          equalitiesLength--;  // Throw away the previous equality.\n          pointer = equalitiesLength > 0 ?\n              equalities[equalitiesLength - 1] : -1;\n          post_ins = post_del = false;\n        }\n        changes = true;\n      }\n    }\n    pointer++;\n  }\n\n  if (changes) {\n    this.diff_cleanupMerge(diffs);\n  }\n};\n\n\n/**\n * Reorder and merge like edit sections.  Merge equalities.\n * Any edit section can move as long as it doesn't cross an equality.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n */\ndiff_match_patch.prototype.diff_cleanupMerge = function(diffs) {\n  diffs.push([DIFF_EQUAL, '']);  // Add a dummy entry at the end.\n  var pointer = 0;\n  var count_delete = 0;\n  var count_insert = 0;\n  var text_delete = '';\n  var text_insert = '';\n  var commonlength;\n  while (pointer < diffs.length) {\n    switch (diffs[pointer][0]) {\n      case DIFF_INSERT:\n        count_insert++;\n        text_insert += diffs[pointer][1];\n        pointer++;\n        break;\n      case DIFF_DELETE:\n        count_delete++;\n        text_delete += diffs[pointer][1];\n        pointer++;\n        break;\n      case DIFF_EQUAL:\n        // Upon reaching an equality, check for prior redundancies.\n        if (count_delete + count_insert > 1) {\n          if (count_delete !== 0 && count_insert !== 0) {\n            // Factor out any common prefixies.\n            commonlength = this.diff_commonPrefix(text_insert, text_delete);\n            if (commonlength !== 0) {\n              if ((pointer - count_delete - count_insert) > 0 &&\n                  diffs[pointer - count_delete - count_insert - 1][0] ==\n                  DIFF_EQUAL) {\n                diffs[pointer - count_delete - count_insert - 1][1] +=\n                    text_insert.substring(0, commonlength);\n              } else {\n                diffs.splice(0, 0, [DIFF_EQUAL,\n                                    text_insert.substring(0, commonlength)]);\n                pointer++;\n              }\n              text_insert = text_insert.substring(commonlength);\n              text_delete = text_delete.substring(commonlength);\n            }\n            // Factor out any common suffixies.\n            commonlength = this.diff_commonSuffix(text_insert, text_delete);\n            if (commonlength !== 0) {\n              diffs[pointer][1] = text_insert.substring(text_insert.length -\n                  commonlength) + diffs[pointer][1];\n              text_insert = text_insert.substring(0, text_insert.length -\n                  commonlength);\n              text_delete = text_delete.substring(0, text_delete.length -\n                  commonlength);\n            }\n          }\n          // Delete the offending records and add the merged ones.\n          if (count_delete === 0) {\n            diffs.splice(pointer - count_delete - count_insert,\n                count_delete + count_insert, [DIFF_INSERT, text_insert]);\n          } else if (count_insert === 0) {\n            diffs.splice(pointer - count_delete - count_insert,\n                count_delete + count_insert, [DIFF_DELETE, text_delete]);\n          } else {\n            diffs.splice(pointer - count_delete - count_insert,\n                count_delete + count_insert, [DIFF_DELETE, text_delete],\n                [DIFF_INSERT, text_insert]);\n          }\n          pointer = pointer - count_delete - count_insert +\n                    (count_delete ? 1 : 0) + (count_insert ? 1 : 0) + 1;\n        } else if (pointer !== 0 && diffs[pointer - 1][0] == DIFF_EQUAL) {\n          // Merge this equality with the previous one.\n          diffs[pointer - 1][1] += diffs[pointer][1];\n          diffs.splice(pointer, 1);\n        } else {\n          pointer++;\n        }\n        count_insert = 0;\n        count_delete = 0;\n        text_delete = '';\n        text_insert = '';\n        break;\n    }\n  }\n  if (diffs[diffs.length - 1][1] === '') {\n    diffs.pop();  // Remove the dummy entry at the end.\n  }\n\n  // Second pass: look for single edits surrounded on both sides by equalities\n  // which can be shifted sideways to eliminate an equality.\n  // e.g: A<ins>BA</ins>C -> <ins>AB</ins>AC\n  var changes = false;\n  pointer = 1;\n  // Intentionally ignore the first and last element (don't need checking).\n  while (pointer < diffs.length - 1) {\n    if (diffs[pointer - 1][0] == DIFF_EQUAL &&\n        diffs[pointer + 1][0] == DIFF_EQUAL) {\n      // This is a single edit surrounded by equalities.\n      if (diffs[pointer][1].substring(diffs[pointer][1].length -\n          diffs[pointer - 1][1].length) == diffs[pointer - 1][1]) {\n        // Shift the edit over the previous equality.\n        diffs[pointer][1] = diffs[pointer - 1][1] +\n            diffs[pointer][1].substring(0, diffs[pointer][1].length -\n                                        diffs[pointer - 1][1].length);\n        diffs[pointer + 1][1] = diffs[pointer - 1][1] + diffs[pointer + 1][1];\n        diffs.splice(pointer - 1, 1);\n        changes = true;\n      } else if (diffs[pointer][1].substring(0, diffs[pointer + 1][1].length) ==\n          diffs[pointer + 1][1]) {\n        // Shift the edit over the next equality.\n        diffs[pointer - 1][1] += diffs[pointer + 1][1];\n        diffs[pointer][1] =\n            diffs[pointer][1].substring(diffs[pointer + 1][1].length) +\n            diffs[pointer + 1][1];\n        diffs.splice(pointer + 1, 1);\n        changes = true;\n      }\n    }\n    pointer++;\n  }\n  // If shifts were made, the diff needs reordering and another shift sweep.\n  if (changes) {\n    this.diff_cleanupMerge(diffs);\n  }\n};\n\n\n/**\n * loc is a location in text1, compute and return the equivalent location in\n * text2.\n * e.g. 'The cat' vs 'The big cat', 1->1, 5->8\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @param {number} loc Location within text1.\n * @return {number} Location within text2.\n */\ndiff_match_patch.prototype.diff_xIndex = function(diffs, loc) {\n  var chars1 = 0;\n  var chars2 = 0;\n  var last_chars1 = 0;\n  var last_chars2 = 0;\n  var x;\n  for (x = 0; x < diffs.length; x++) {\n    if (diffs[x][0] !== DIFF_INSERT) {  // Equality or deletion.\n      chars1 += diffs[x][1].length;\n    }\n    if (diffs[x][0] !== DIFF_DELETE) {  // Equality or insertion.\n      chars2 += diffs[x][1].length;\n    }\n    if (chars1 > loc) {  // Overshot the location.\n      break;\n    }\n    last_chars1 = chars1;\n    last_chars2 = chars2;\n  }\n  // Was the location was deleted?\n  if (diffs.length != x && diffs[x][0] === DIFF_DELETE) {\n    return last_chars2;\n  }\n  // Add the remaining character length.\n  return last_chars2 + (loc - last_chars1);\n};\n\n\n/**\n * Convert a diff array into a pretty HTML report.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @return {string} HTML representation.\n */\ndiff_match_patch.prototype.diff_prettyHtml = function(diffs) {\n  var html = [];\n  var i = 0;\n  var pattern_amp = /&/g;\n  var pattern_lt = /</g;\n  var pattern_gt = />/g;\n  var pattern_para = /\\n/g;\n  for (var x = 0; x < diffs.length; x++) {\n    var op = diffs[x][0];    // Operation (insert, delete, equal)\n    var data = diffs[x][1];  // Text of change.\n    var text = data.replace(pattern_amp, '&amp;').replace(pattern_lt, '&lt;')\n        .replace(pattern_gt, '&gt;').replace(pattern_para, '&para;<br>');\n    switch (op) {\n      case DIFF_INSERT:\n        html[x] = '<ins style=\"background:#e6ffe6;\">' + text + '</ins>';\n        break;\n      case DIFF_DELETE:\n        html[x] = '<del style=\"background:#ffe6e6;\">' + text + '</del>';\n        break;\n      case DIFF_EQUAL:\n        html[x] = '<span>' + text + '</span>';\n        break;\n    }\n    if (op !== DIFF_DELETE) {\n      i += data.length;\n    }\n  }\n  return html.join('');\n};\n\n\n/**\n * Compute and return the source text (all equalities and deletions).\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @return {string} Source text.\n */\ndiff_match_patch.prototype.diff_text1 = function(diffs) {\n  var text = [];\n  for (var x = 0; x < diffs.length; x++) {\n    if (diffs[x][0] !== DIFF_INSERT) {\n      text[x] = diffs[x][1];\n    }\n  }\n  return text.join('');\n};\n\n\n/**\n * Compute and return the destination text (all equalities and insertions).\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @return {string} Destination text.\n */\ndiff_match_patch.prototype.diff_text2 = function(diffs) {\n  var text = [];\n  for (var x = 0; x < diffs.length; x++) {\n    if (diffs[x][0] !== DIFF_DELETE) {\n      text[x] = diffs[x][1];\n    }\n  }\n  return text.join('');\n};\n\n\n/**\n * Compute the Levenshtein distance; the number of inserted, deleted or\n * substituted characters.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @return {number} Number of changes.\n */\ndiff_match_patch.prototype.diff_levenshtein = function(diffs) {\n  var levenshtein = 0;\n  var insertions = 0;\n  var deletions = 0;\n  for (var x = 0; x < diffs.length; x++) {\n    var op = diffs[x][0];\n    var data = diffs[x][1];\n    switch (op) {\n      case DIFF_INSERT:\n        insertions += data.length;\n        break;\n      case DIFF_DELETE:\n        deletions += data.length;\n        break;\n      case DIFF_EQUAL:\n        // A deletion and an insertion is one substitution.\n        levenshtein += Math.max(insertions, deletions);\n        insertions = 0;\n        deletions = 0;\n        break;\n    }\n  }\n  levenshtein += Math.max(insertions, deletions);\n  return levenshtein;\n};\n\n\n/**\n * Crush the diff into an encoded string which describes the operations\n * required to transform text1 into text2.\n * E.g. =3\\t-2\\t+ing  -> Keep 3 chars, delete 2 chars, insert 'ing'.\n * Operations are tab-separated.  Inserted text is escaped using %xx notation.\n * @param {!Array.<!diff_match_patch.Diff>} diffs Array of diff tuples.\n * @return {string} Delta text.\n */\ndiff_match_patch.prototype.diff_toDelta = function(diffs) {\n  var text = [];\n  for (var x = 0; x < diffs.length; x++) {\n    switch (diffs[x][0]) {\n      case DIFF_INSERT:\n        text[x] = '+' + encodeURI(diffs[x][1]);\n        break;\n      case DIFF_DELETE:\n        text[x] = '-' + diffs[x][1].length;\n        break;\n      case DIFF_EQUAL:\n        text[x] = '=' + diffs[x][1].length;\n        break;\n    }\n  }\n  return text.join('\\t').replace(/%20/g, ' ');\n};\n\n\n/**\n * Given the original text1, and an encoded string which describes the\n * operations required to transform text1 into text2, compute the full diff.\n * @param {string} text1 Source string for the diff.\n * @param {string} delta Delta text.\n * @return {!Array.<!diff_match_patch.Diff>} Array of diff tuples.\n * @throws {!Error} If invalid input.\n */\ndiff_match_patch.prototype.diff_fromDelta = function(text1, delta) {\n  var diffs = [];\n  var diffsLength = 0;  // Keeping our own length var is faster in JS.\n  var pointer = 0;  // Cursor in text1\n  var tokens = delta.split(/\\t/g);\n  for (var x = 0; x < tokens.length; x++) {\n    // Each token begins with a one character parameter which specifies the\n    // operation of this token (delete, insert, equality).\n    var param = tokens[x].substring(1);\n    switch (tokens[x].charAt(0)) {\n      case '+':\n        try {\n          diffs[diffsLength++] = [DIFF_INSERT, decodeURI(param)];\n        } catch (ex) {\n          // Malformed URI sequence.\n          throw new Error('Illegal escape in diff_fromDelta: ' + param);\n        }\n        break;\n      case '-':\n        // Fall through.\n      case '=':\n        var n = parseInt(param, 10);\n        if (isNaN(n) || n < 0) {\n          throw new Error('Invalid number in diff_fromDelta: ' + param);\n        }\n        var text = text1.substring(pointer, pointer += n);\n        if (tokens[x].charAt(0) == '=') {\n          diffs[diffsLength++] = [DIFF_EQUAL, text];\n        } else {\n          diffs[diffsLength++] = [DIFF_DELETE, text];\n        }\n        break;\n      default:\n        // Blank tokens are ok (from a trailing \\t).\n        // Anything else is an error.\n        if (tokens[x]) {\n          throw new Error('Invalid diff operation in diff_fromDelta: ' +\n                          tokens[x]);\n        }\n    }\n  }\n  if (pointer != text1.length) {\n    throw new Error('Delta length (' + pointer +\n        ') does not equal source text length (' + text1.length + ').');\n  }\n  return diffs;\n};\n\n\n//  MATCH FUNCTIONS\n\n\n/**\n * Locate the best instance of 'pattern' in 'text' near 'loc'.\n * @param {string} text The text to search.\n * @param {string} pattern The pattern to search for.\n * @param {number} loc The location to search around.\n * @return {number} Best match index or -1.\n */\ndiff_match_patch.prototype.match_main = function(text, pattern, loc) {\n  // Check for null inputs.\n  if (text == null || pattern == null || loc == null) {\n    throw new Error('Null input. (match_main)');\n  }\n\n  loc = Math.max(0, Math.min(loc, text.length));\n  if (text == pattern) {\n    // Shortcut (potentially not guaranteed by the algorithm)\n    return 0;\n  } else if (!text.length) {\n    // Nothing to match.\n    return -1;\n  } else if (text.substring(loc, loc + pattern.length) == pattern) {\n    // Perfect match at the perfect spot!  (Includes case of null pattern)\n    return loc;\n  } else {\n    // Do a fuzzy compare.\n    return this.match_bitap_(text, pattern, loc);\n  }\n};\n\n\n/**\n * Locate the best instance of 'pattern' in 'text' near 'loc' using the\n * Bitap algorithm.\n * @param {string} text The text to search.\n * @param {string} pattern The pattern to search for.\n * @param {number} loc The location to search around.\n * @return {number} Best match index or -1.\n * @private\n */\ndiff_match_patch.prototype.match_bitap_ = function(text, pattern, loc) {\n  if (pattern.length > this.Match_MaxBits) {\n    throw new Error('Pattern too long for this browser.');\n  }\n\n  // Initialise the alphabet.\n  var s = this.match_alphabet_(pattern);\n\n  var dmp = this;  // 'this' becomes 'window' in a closure.\n\n  /**\n   * Compute and return the score for a match with e errors and x location.\n   * Accesses loc and pattern through being a closure.\n   * @param {number} e Number of errors in match.\n   * @param {number} x Location of match.\n   * @return {number} Overall score for match (0.0 = good, 1.0 = bad).\n   * @private\n   */\n  function match_bitapScore_(e, x) {\n    var accuracy = e / pattern.length;\n    var proximity = Math.abs(loc - x);\n    if (!dmp.Match_Distance) {\n      // Dodge divide by zero error.\n      return proximity ? 1.0 : accuracy;\n    }\n    return accuracy + (proximity / dmp.Match_Distance);\n  }\n\n  // Highest score beyond which we give up.\n  var score_threshold = this.Match_Threshold;\n  // Is there a nearby exact match? (speedup)\n  var best_loc = text.indexOf(pattern, loc);\n  if (best_loc != -1) {\n    score_threshold = Math.min(match_bitapScore_(0, best_loc), score_threshold);\n    // What about in the other direction? (speedup)\n    best_loc = text.lastIndexOf(pattern, loc + pattern.length);\n    if (best_loc != -1) {\n      score_threshold =\n          Math.min(match_bitapScore_(0, best_loc), score_threshold);\n    }\n  }\n\n  // Initialise the bit arrays.\n  var matchmask = 1 << (pattern.length - 1);\n  best_loc = -1;\n\n  var bin_min, bin_mid;\n  var bin_max = pattern.length + text.length;\n  var last_rd;\n  for (var d = 0; d < pattern.length; d++) {\n    // Scan for the best match; each iteration allows for one more error.\n    // Run a binary search to determine how far from 'loc' we can stray at this\n    // error level.\n    bin_min = 0;\n    bin_mid = bin_max;\n    while (bin_min < bin_mid) {\n      if (match_bitapScore_(d, loc + bin_mid) <= score_threshold) {\n        bin_min = bin_mid;\n      } else {\n        bin_max = bin_mid;\n      }\n      bin_mid = Math.floor((bin_max - bin_min) / 2 + bin_min);\n    }\n    // Use the result from this iteration as the maximum for the next.\n    bin_max = bin_mid;\n    var start = Math.max(1, loc - bin_mid + 1);\n    var finish = Math.min(loc + bin_mid, text.length) + pattern.length;\n\n    var rd = Array(finish + 2);\n    rd[finish + 1] = (1 << d) - 1;\n    for (var j = finish; j >= start; j--) {\n      // The alphabet (s) is a sparse hash, so the following line generates\n      // warnings.\n      var charMatch = s[text.charAt(j - 1)];\n      if (d === 0) {  // First pass: exact match.\n        rd[j] = ((rd[j + 1] << 1) | 1) & charMatch;\n      } else {  // Subsequent passes: fuzzy match.\n        rd[j] = ((rd[j + 1] << 1) | 1) & charMatch |\n                (((last_rd[j + 1] | last_rd[j]) << 1) | 1) |\n                last_rd[j + 1];\n      }\n      if (rd[j] & matchmask) {\n        var score = match_bitapScore_(d, j - 1);\n        // This match will almost certainly be better than any existing match.\n        // But check anyway.\n        if (score <= score_threshold) {\n          // Told you so.\n          score_threshold = score;\n          best_loc = j - 1;\n          if (best_loc > loc) {\n            // When passing loc, don't exceed our current distance from loc.\n            start = Math.max(1, 2 * loc - best_loc);\n          } else {\n            // Already passed loc, downhill from here on in.\n            break;\n          }\n        }\n      }\n    }\n    // No hope for a (better) match at greater error levels.\n    if (match_bitapScore_(d + 1, loc) > score_threshold) {\n      break;\n    }\n    last_rd = rd;\n  }\n  return best_loc;\n};\n\n\n/**\n * Initialise the alphabet for the Bitap algorithm.\n * @param {string} pattern The text to encode.\n * @return {!Object} Hash of character locations.\n * @private\n */\ndiff_match_patch.prototype.match_alphabet_ = function(pattern) {\n  var s = {};\n  for (var i = 0; i < pattern.length; i++) {\n    s[pattern.charAt(i)] = 0;\n  }\n  for (var i = 0; i < pattern.length; i++) {\n    s[pattern.charAt(i)] |= 1 << (pattern.length - i - 1);\n  }\n  return s;\n};\n\n\n//  PATCH FUNCTIONS\n\n\n/**\n * Increase the context until it is unique,\n * but don't let the pattern expand beyond Match_MaxBits.\n * @param {!diff_match_patch.patch_obj} patch The patch to grow.\n * @param {string} text Source text.\n * @private\n */\ndiff_match_patch.prototype.patch_addContext_ = function(patch, text) {\n  if (text.length == 0) {\n    return;\n  }\n  var pattern = text.substring(patch.start2, patch.start2 + patch.length1);\n  var padding = 0;\n\n  // Look for the first and last matches of pattern in text.  If two different\n  // matches are found, increase the pattern length.\n  while (text.indexOf(pattern) != text.lastIndexOf(pattern) &&\n         pattern.length < this.Match_MaxBits - this.Patch_Margin -\n         this.Patch_Margin) {\n    padding += this.Patch_Margin;\n    pattern = text.substring(patch.start2 - padding,\n                             patch.start2 + patch.length1 + padding);\n  }\n  // Add one chunk for good luck.\n  padding += this.Patch_Margin;\n\n  // Add the prefix.\n  var prefix = text.substring(patch.start2 - padding, patch.start2);\n  if (prefix) {\n    patch.diffs.unshift([DIFF_EQUAL, prefix]);\n  }\n  // Add the suffix.\n  var suffix = text.substring(patch.start2 + patch.length1,\n                              patch.start2 + patch.length1 + padding);\n  if (suffix) {\n    patch.diffs.push([DIFF_EQUAL, suffix]);\n  }\n\n  // Roll back the start points.\n  patch.start1 -= prefix.length;\n  patch.start2 -= prefix.length;\n  // Extend the lengths.\n  patch.length1 += prefix.length + suffix.length;\n  patch.length2 += prefix.length + suffix.length;\n};\n\n\n/**\n * Compute a list of patches to turn text1 into text2.\n * Use diffs if provided, otherwise compute it ourselves.\n * There are four ways to call this function, depending on what data is\n * available to the caller:\n * Method 1:\n * a = text1, b = text2\n * Method 2:\n * a = diffs\n * Method 3 (optimal):\n * a = text1, b = diffs\n * Method 4 (deprecated, use method 3):\n * a = text1, b = text2, c = diffs\n *\n * @param {string|!Array.<!diff_match_patch.Diff>} a text1 (methods 1,3,4) or\n * Array of diff tuples for text1 to text2 (method 2).\n * @param {string|!Array.<!diff_match_patch.Diff>} opt_b text2 (methods 1,4) or\n * Array of diff tuples for text1 to text2 (method 3) or undefined (method 2).\n * @param {string|!Array.<!diff_match_patch.Diff>} opt_c Array of diff tuples\n * for text1 to text2 (method 4) or undefined (methods 1,2,3).\n * @return {!Array.<!diff_match_patch.patch_obj>} Array of patch objects.\n */\ndiff_match_patch.prototype.patch_make = function(a, opt_b, opt_c) {\n  var text1, diffs;\n  if (typeof a == 'string' && typeof opt_b == 'string' &&\n      typeof opt_c == 'undefined') {\n    // Method 1: text1, text2\n    // Compute diffs from text1 and text2.\n    text1 = /** @type {string} */(a);\n    diffs = this.diff_main(text1, /** @type {string} */(opt_b), true);\n    if (diffs.length > 2) {\n      this.diff_cleanupSemantic(diffs);\n      this.diff_cleanupEfficiency(diffs);\n    }\n  } else if (a && typeof a == 'object' && typeof opt_b == 'undefined' &&\n      typeof opt_c == 'undefined') {\n    // Method 2: diffs\n    // Compute text1 from diffs.\n    diffs = /** @type {!Array.<!diff_match_patch.Diff>} */(a);\n    text1 = this.diff_text1(diffs);\n  } else if (typeof a == 'string' && opt_b && typeof opt_b == 'object' &&\n      typeof opt_c == 'undefined') {\n    // Method 3: text1, diffs\n    text1 = /** @type {string} */(a);\n    diffs = /** @type {!Array.<!diff_match_patch.Diff>} */(opt_b);\n  } else if (typeof a == 'string' && typeof opt_b == 'string' &&\n      opt_c && typeof opt_c == 'object') {\n    // Method 4: text1, text2, diffs\n    // text2 is not used.\n    text1 = /** @type {string} */(a);\n    diffs = /** @type {!Array.<!diff_match_patch.Diff>} */(opt_c);\n  } else {\n    throw new Error('Unknown call format to patch_make.');\n  }\n\n  if (diffs.length === 0) {\n    return [];  // Get rid of the null case.\n  }\n  var patches = [];\n  var patch = new diff_match_patch.patch_obj();\n  var patchDiffLength = 0;  // Keeping our own length var is faster in JS.\n  var char_count1 = 0;  // Number of characters into the text1 string.\n  var char_count2 = 0;  // Number of characters into the text2 string.\n  // Start with text1 (prepatch_text) and apply the diffs until we arrive at\n  // text2 (postpatch_text).  We recreate the patches one by one to determine\n  // context info.\n  var prepatch_text = text1;\n  var postpatch_text = text1;\n  for (var x = 0; x < diffs.length; x++) {\n    var diff_type = diffs[x][0];\n    var diff_text = diffs[x][1];\n\n    if (!patchDiffLength && diff_type !== DIFF_EQUAL) {\n      // A new patch starts here.\n      patch.start1 = char_count1;\n      patch.start2 = char_count2;\n    }\n\n    switch (diff_type) {\n      case DIFF_INSERT:\n        patch.diffs[patchDiffLength++] = diffs[x];\n        patch.length2 += diff_text.length;\n        postpatch_text = postpatch_text.substring(0, char_count2) + diff_text +\n                         postpatch_text.substring(char_count2);\n        break;\n      case DIFF_DELETE:\n        patch.length1 += diff_text.length;\n        patch.diffs[patchDiffLength++] = diffs[x];\n        postpatch_text = postpatch_text.substring(0, char_count2) +\n                         postpatch_text.substring(char_count2 +\n                             diff_text.length);\n        break;\n      case DIFF_EQUAL:\n        if (diff_text.length <= 2 * this.Patch_Margin &&\n            patchDiffLength && diffs.length != x + 1) {\n          // Small equality inside a patch.\n          patch.diffs[patchDiffLength++] = diffs[x];\n          patch.length1 += diff_text.length;\n          patch.length2 += diff_text.length;\n        } else if (diff_text.length >= 2 * this.Patch_Margin) {\n          // Time for a new patch.\n          if (patchDiffLength) {\n            this.patch_addContext_(patch, prepatch_text);\n            patches.push(patch);\n            patch = new diff_match_patch.patch_obj();\n            patchDiffLength = 0;\n            // Unlike Unidiff, our patch lists have a rolling context.\n            // http://code.google.com/p/google-diff-match-patch/wiki/Unidiff\n            // Update prepatch text & pos to reflect the application of the\n            // just completed patch.\n            prepatch_text = postpatch_text;\n            char_count1 = char_count2;\n          }\n        }\n        break;\n    }\n\n    // Update the current character count.\n    if (diff_type !== DIFF_INSERT) {\n      char_count1 += diff_text.length;\n    }\n    if (diff_type !== DIFF_DELETE) {\n      char_count2 += diff_text.length;\n    }\n  }\n  // Pick up the leftover patch if not empty.\n  if (patchDiffLength) {\n    this.patch_addContext_(patch, prepatch_text);\n    patches.push(patch);\n  }\n\n  return patches;\n};\n\n\n/**\n * Given an array of patches, return another array that is identical.\n * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of patch objects.\n * @return {!Array.<!diff_match_patch.patch_obj>} Array of patch objects.\n */\ndiff_match_patch.prototype.patch_deepCopy = function(patches) {\n  // Making deep copies is hard in JavaScript.\n  var patchesCopy = [];\n  for (var x = 0; x < patches.length; x++) {\n    var patch = patches[x];\n    var patchCopy = new diff_match_patch.patch_obj();\n    patchCopy.diffs = [];\n    for (var y = 0; y < patch.diffs.length; y++) {\n      patchCopy.diffs[y] = patch.diffs[y].slice();\n    }\n    patchCopy.start1 = patch.start1;\n    patchCopy.start2 = patch.start2;\n    patchCopy.length1 = patch.length1;\n    patchCopy.length2 = patch.length2;\n    patchesCopy[x] = patchCopy;\n  }\n  return patchesCopy;\n};\n\n\n/**\n * Merge a set of patches onto the text.  Return a patched text, as well\n * as a list of true/false values indicating which patches were applied.\n * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of patch objects.\n * @param {string} text Old text.\n * @return {!Array.<string|!Array.<boolean>>} Two element Array, containing the\n *      new text and an array of boolean values.\n */\ndiff_match_patch.prototype.patch_apply = function(patches, text) {\n  if (patches.length == 0) {\n    return [text, []];\n  }\n\n  // Deep copy the patches so that no changes are made to originals.\n  patches = this.patch_deepCopy(patches);\n\n  var nullPadding = this.patch_addPadding(patches);\n  text = nullPadding + text + nullPadding;\n\n  this.patch_splitMax(patches);\n  // delta keeps track of the offset between the expected and actual location\n  // of the previous patch.  If there are patches expected at positions 10 and\n  // 20, but the first patch was found at 12, delta is 2 and the second patch\n  // has an effective expected position of 22.\n  var delta = 0;\n  var results = [];\n  for (var x = 0; x < patches.length; x++) {\n    var expected_loc = patches[x].start2 + delta;\n    var text1 = this.diff_text1(patches[x].diffs);\n    var start_loc;\n    var end_loc = -1;\n    if (text1.length > this.Match_MaxBits) {\n      // patch_splitMax will only provide an oversized pattern in the case of\n      // a monster delete.\n      start_loc = this.match_main(text, text1.substring(0, this.Match_MaxBits),\n                                  expected_loc);\n      if (start_loc != -1) {\n        end_loc = this.match_main(text,\n            text1.substring(text1.length - this.Match_MaxBits),\n            expected_loc + text1.length - this.Match_MaxBits);\n        if (end_loc == -1 || start_loc >= end_loc) {\n          // Can't find valid trailing context.  Drop this patch.\n          start_loc = -1;\n        }\n      }\n    } else {\n      start_loc = this.match_main(text, text1, expected_loc);\n    }\n    if (start_loc == -1) {\n      // No match found.  :(\n      results[x] = false;\n      // Subtract the delta for this failed patch from subsequent patches.\n      delta -= patches[x].length2 - patches[x].length1;\n    } else {\n      // Found a match.  :)\n      results[x] = true;\n      delta = start_loc - expected_loc;\n      var text2;\n      if (end_loc == -1) {\n        text2 = text.substring(start_loc, start_loc + text1.length);\n      } else {\n        text2 = text.substring(start_loc, end_loc + this.Match_MaxBits);\n      }\n      if (text1 == text2) {\n        // Perfect match, just shove the replacement text in.\n        text = text.substring(0, start_loc) +\n               this.diff_text2(patches[x].diffs) +\n               text.substring(start_loc + text1.length);\n      } else {\n        // Imperfect match.  Run a diff to get a framework of equivalent\n        // indices.\n        var diffs = this.diff_main(text1, text2, false);\n        if (text1.length > this.Match_MaxBits &&\n            this.diff_levenshtein(diffs) / text1.length >\n            this.Patch_DeleteThreshold) {\n          // The end points match, but the content is unacceptably bad.\n          results[x] = false;\n        } else {\n          this.diff_cleanupSemanticLossless(diffs);\n          var index1 = 0;\n          var index2;\n          for (var y = 0; y < patches[x].diffs.length; y++) {\n            var mod = patches[x].diffs[y];\n            if (mod[0] !== DIFF_EQUAL) {\n              index2 = this.diff_xIndex(diffs, index1);\n            }\n            if (mod[0] === DIFF_INSERT) {  // Insertion\n              text = text.substring(0, start_loc + index2) + mod[1] +\n                     text.substring(start_loc + index2);\n            } else if (mod[0] === DIFF_DELETE) {  // Deletion\n              text = text.substring(0, start_loc + index2) +\n                     text.substring(start_loc + this.diff_xIndex(diffs,\n                         index1 + mod[1].length));\n            }\n            if (mod[0] !== DIFF_DELETE) {\n              index1 += mod[1].length;\n            }\n          }\n        }\n      }\n    }\n  }\n  // Strip the padding off.\n  text = text.substring(nullPadding.length, text.length - nullPadding.length);\n  return [text, results];\n};\n\n\n/**\n * Add some padding on text start and end so that edges can match something.\n * Intended to be called only from within patch_apply.\n * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of patch objects.\n * @return {string} The padding string added to each side.\n */\ndiff_match_patch.prototype.patch_addPadding = function(patches) {\n  var paddingLength = this.Patch_Margin;\n  var nullPadding = '';\n  for (var x = 1; x <= paddingLength; x++) {\n    nullPadding += String.fromCharCode(x);\n  }\n\n  // Bump all the patches forward.\n  for (var x = 0; x < patches.length; x++) {\n    patches[x].start1 += paddingLength;\n    patches[x].start2 += paddingLength;\n  }\n\n  // Add some padding on start of first diff.\n  var patch = patches[0];\n  var diffs = patch.diffs;\n  if (diffs.length == 0 || diffs[0][0] != DIFF_EQUAL) {\n    // Add nullPadding equality.\n    diffs.unshift([DIFF_EQUAL, nullPadding]);\n    patch.start1 -= paddingLength;  // Should be 0.\n    patch.start2 -= paddingLength;  // Should be 0.\n    patch.length1 += paddingLength;\n    patch.length2 += paddingLength;\n  } else if (paddingLength > diffs[0][1].length) {\n    // Grow first equality.\n    var extraLength = paddingLength - diffs[0][1].length;\n    diffs[0][1] = nullPadding.substring(diffs[0][1].length) + diffs[0][1];\n    patch.start1 -= extraLength;\n    patch.start2 -= extraLength;\n    patch.length1 += extraLength;\n    patch.length2 += extraLength;\n  }\n\n  // Add some padding on end of last diff.\n  patch = patches[patches.length - 1];\n  diffs = patch.diffs;\n  if (diffs.length == 0 || diffs[diffs.length - 1][0] != DIFF_EQUAL) {\n    // Add nullPadding equality.\n    diffs.push([DIFF_EQUAL, nullPadding]);\n    patch.length1 += paddingLength;\n    patch.length2 += paddingLength;\n  } else if (paddingLength > diffs[diffs.length - 1][1].length) {\n    // Grow last equality.\n    var extraLength = paddingLength - diffs[diffs.length - 1][1].length;\n    diffs[diffs.length - 1][1] += nullPadding.substring(0, extraLength);\n    patch.length1 += extraLength;\n    patch.length2 += extraLength;\n  }\n\n  return nullPadding;\n};\n\n\n/**\n * Look through the patches and break up any which are longer than the maximum\n * limit of the match algorithm.\n * Intended to be called only from within patch_apply.\n * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of patch objects.\n */\ndiff_match_patch.prototype.patch_splitMax = function(patches) {\n  var patch_size = this.Match_MaxBits;\n  for (var x = 0; x < patches.length; x++) {\n    if (patches[x].length1 > patch_size) {\n      var bigpatch = patches[x];\n      // Remove the big old patch.\n      patches.splice(x--, 1);\n      var start1 = bigpatch.start1;\n      var start2 = bigpatch.start2;\n      var precontext = '';\n      while (bigpatch.diffs.length !== 0) {\n        // Create one of several smaller patches.\n        var patch = new diff_match_patch.patch_obj();\n        var empty = true;\n        patch.start1 = start1 - precontext.length;\n        patch.start2 = start2 - precontext.length;\n        if (precontext !== '') {\n          patch.length1 = patch.length2 = precontext.length;\n          patch.diffs.push([DIFF_EQUAL, precontext]);\n        }\n        while (bigpatch.diffs.length !== 0 &&\n               patch.length1 < patch_size - this.Patch_Margin) {\n          var diff_type = bigpatch.diffs[0][0];\n          var diff_text = bigpatch.diffs[0][1];\n          if (diff_type === DIFF_INSERT) {\n            // Insertions are harmless.\n            patch.length2 += diff_text.length;\n            start2 += diff_text.length;\n            patch.diffs.push(bigpatch.diffs.shift());\n            empty = false;\n          } else if (diff_type === DIFF_DELETE && patch.diffs.length == 1 &&\n                     patch.diffs[0][0] == DIFF_EQUAL &&\n                     diff_text.length > 2 * patch_size) {\n            // This is a large deletion.  Let it pass in one chunk.\n            patch.length1 += diff_text.length;\n            start1 += diff_text.length;\n            empty = false;\n            patch.diffs.push([diff_type, diff_text]);\n            bigpatch.diffs.shift();\n          } else {\n            // Deletion or equality.  Only take as much as we can stomach.\n            diff_text = diff_text.substring(0,\n                patch_size - patch.length1 - this.Patch_Margin);\n            patch.length1 += diff_text.length;\n            start1 += diff_text.length;\n            if (diff_type === DIFF_EQUAL) {\n              patch.length2 += diff_text.length;\n              start2 += diff_text.length;\n            } else {\n              empty = false;\n            }\n            patch.diffs.push([diff_type, diff_text]);\n            if (diff_text == bigpatch.diffs[0][1]) {\n              bigpatch.diffs.shift();\n            } else {\n              bigpatch.diffs[0][1] =\n                  bigpatch.diffs[0][1].substring(diff_text.length);\n            }\n          }\n        }\n        // Compute the head context for the next patch.\n        precontext = this.diff_text2(patch.diffs);\n        precontext =\n            precontext.substring(precontext.length - this.Patch_Margin);\n        // Append the end context for this patch.\n        var postcontext = this.diff_text1(bigpatch.diffs)\n                              .substring(0, this.Patch_Margin);\n        if (postcontext !== '') {\n          patch.length1 += postcontext.length;\n          patch.length2 += postcontext.length;\n          if (patch.diffs.length !== 0 &&\n              patch.diffs[patch.diffs.length - 1][0] === DIFF_EQUAL) {\n            patch.diffs[patch.diffs.length - 1][1] += postcontext;\n          } else {\n            patch.diffs.push([DIFF_EQUAL, postcontext]);\n          }\n        }\n        if (!empty) {\n          patches.splice(++x, 0, patch);\n        }\n      }\n    }\n  }\n};\n\n\n/**\n * Take a list of patches and return a textual representation.\n * @param {!Array.<!diff_match_patch.patch_obj>} patches Array of patch objects.\n * @return {string} Text representation of patches.\n */\ndiff_match_patch.prototype.patch_toText = function(patches) {\n  var text = [];\n  for (var x = 0; x < patches.length; x++) {\n    text[x] = patches[x];\n  }\n  return text.join('');\n};\n\n\n/**\n * Parse a textual representation of patches and return a list of patch objects.\n * @param {string} textline Text representation of patches.\n * @return {!Array.<!diff_match_patch.patch_obj>} Array of patch objects.\n * @throws {!Error} If invalid input.\n */\ndiff_match_patch.prototype.patch_fromText = function(textline) {\n  var patches = [];\n  if (!textline) {\n    return patches;\n  }\n  var text = textline.split('\\n');\n  var textPointer = 0;\n  var patchHeader = /^@@ -(\\d+),?(\\d*) \\+(\\d+),?(\\d*) @@$/;\n  while (textPointer < text.length) {\n    var m = text[textPointer].match(patchHeader);\n    if (!m) {\n      throw new Error('Invalid patch string: ' + text[textPointer]);\n    }\n    var patch = new diff_match_patch.patch_obj();\n    patches.push(patch);\n    patch.start1 = parseInt(m[1], 10);\n    if (m[2] === '') {\n      patch.start1--;\n      patch.length1 = 1;\n    } else if (m[2] == '0') {\n      patch.length1 = 0;\n    } else {\n      patch.start1--;\n      patch.length1 = parseInt(m[2], 10);\n    }\n\n    patch.start2 = parseInt(m[3], 10);\n    if (m[4] === '') {\n      patch.start2--;\n      patch.length2 = 1;\n    } else if (m[4] == '0') {\n      patch.length2 = 0;\n    } else {\n      patch.start2--;\n      patch.length2 = parseInt(m[4], 10);\n    }\n    textPointer++;\n\n    while (textPointer < text.length) {\n      var sign = text[textPointer].charAt(0);\n      try {\n        var line = decodeURI(text[textPointer].substring(1));\n      } catch (ex) {\n        // Malformed URI sequence.\n        throw new Error('Illegal escape in patch_fromText: ' + line);\n      }\n      if (sign == '-') {\n        // Deletion.\n        patch.diffs.push([DIFF_DELETE, line]);\n      } else if (sign == '+') {\n        // Insertion.\n        patch.diffs.push([DIFF_INSERT, line]);\n      } else if (sign == ' ') {\n        // Minor equality.\n        patch.diffs.push([DIFF_EQUAL, line]);\n      } else if (sign == '@') {\n        // Start of next patch.\n        break;\n      } else if (sign === '') {\n        // Blank line?  Whatever.\n      } else {\n        // WTF?\n        throw new Error('Invalid patch mode \"' + sign + '\" in: ' + line);\n      }\n      textPointer++;\n    }\n  }\n  return patches;\n};\n\n\n/**\n * Class representing one patch operation.\n * @constructor\n */\ndiff_match_patch.patch_obj = function() {\n  /** @type {!Array.<!diff_match_patch.Diff>} */\n  this.diffs = [];\n  /** @type {?number} */\n  this.start1 = null;\n  /** @type {?number} */\n  this.start2 = null;\n  /** @type {number} */\n  this.length1 = 0;\n  /** @type {number} */\n  this.length2 = 0;\n};\n\n\n/**\n * Emmulate GNU diff's format.\n * Header: @@ -382,8 +481,9 @@\n * Indicies are printed as 1-based, not 0-based.\n * @return {string} The GNU diff string.\n */\ndiff_match_patch.patch_obj.prototype.toString = function() {\n  var coords1, coords2;\n  if (this.length1 === 0) {\n    coords1 = this.start1 + ',0';\n  } else if (this.length1 == 1) {\n    coords1 = this.start1 + 1;\n  } else {\n    coords1 = (this.start1 + 1) + ',' + this.length1;\n  }\n  if (this.length2 === 0) {\n    coords2 = this.start2 + ',0';\n  } else if (this.length2 == 1) {\n    coords2 = this.start2 + 1;\n  } else {\n    coords2 = (this.start2 + 1) + ',' + this.length2;\n  }\n  var text = ['@@ -' + coords1 + ' +' + coords2 + ' @@\\n'];\n  var op;\n  // Escape the body of the patch with %xx notation.\n  for (var x = 0; x < this.diffs.length; x++) {\n    switch (this.diffs[x][0]) {\n      case DIFF_INSERT:\n        op = '+';\n        break;\n      case DIFF_DELETE:\n        op = '-';\n        break;\n      case DIFF_EQUAL:\n        op = ' ';\n        break;\n    }\n    text[x + 1] = op + encodeURI(this.diffs[x][1]) + '\\n';\n  }\n  return text.join('').replace(/%20/g, ' ');\n};\n\n\n// Export these global variables so that they survive Google's JS compiler.\n// In a browser, 'this' will be 'window'.\n// In node.js 'this' will be a global object.\nthis['diff_match_patch'] = diff_match_patch;\nthis['DIFF_DELETE'] = DIFF_DELETE;\nthis['DIFF_INSERT'] = DIFF_INSERT;\nthis['DIFF_EQUAL'] = DIFF_EQUAL;\n\n","\nvar isArray = (typeof Array.isArray === 'function') ?\n  // use native function\n  Array.isArray :\n  // use instanceof operator\n  function(a) {\n    return a instanceof Array;\n  };\n\nfunction cloneRegExp(re) {\n  var regexMatch = /^\\/(.*)\\/([gimyu]*)$/.exec(re.toString());\n  return new RegExp(regexMatch[1], regexMatch[2]);\n}\n\nfunction clone(arg) {\n  if (typeof arg !== 'object') {\n    return arg;\n  }\n  if (arg === null) {\n    return null;\n  }\n  if (isArray(arg)) {\n    return arg.map(clone);\n  }\n  if (arg instanceof Date) {\n    return new Date(arg.getTime());\n  }\n  if (arg instanceof RegExp) {\n    return cloneRegExp(arg);\n  }\n  var cloned = {};\n  for (var name in arg) {\n    if (Object.prototype.hasOwnProperty.call(arg, name)) {\n      cloned[name] = clone(arg[name]);\n    }\n  }\n  return cloned;\n}\n\nmodule.exports = clone;\n","\nvar Pipe = require('../pipe').Pipe;\n\nvar Context = function Context(){\n};\n\nContext.prototype.setResult = function(result) {\n\tthis.result = result;\n\tthis.hasResult = true;\n\treturn this;\n};\n\nContext.prototype.exit = function() {\n\tthis.exiting = true;\n\treturn this;\n};\n\nContext.prototype.switchTo = function(next, pipe) {\n\tif (typeof next === 'string' || next instanceof Pipe) {\n\t\tthis.nextPipe = next;\n\t} else {\n\t\tthis.next = next;\n\t\tif (pipe) {\n\t\t\tthis.nextPipe = pipe;\n\t\t}\n\t}\n\treturn this;\n};\n\nContext.prototype.push = function(child, name) {\n\tchild.parent = this;\n\tif (typeof name !== 'undefined') {\n\t\tchild.childName = name;\n\t}\n\tchild.root = this.root || this;\n\tchild.options = child.options || this.options;\n\tif (!this.children) {\n\t\tthis.children = [child];\n\t\tthis.nextAfterChildren = this.next || null;\n\t\tthis.next = child;\n\t} else {\n\t\tthis.children[this.children.length - 1].next = child;\n\t\tthis.children.push(child);\n\t}\n\tchild.next = this;\n\treturn this;\n};\n\nexports.Context = Context;\n","var Context = require('./context').Context;\nvar defaultClone = require('../clone');\n\nvar DiffContext = function DiffContext(left, right) {\n  this.left = left;\n  this.right = right;\n  this.pipe = 'diff';\n};\n\nDiffContext.prototype = new Context();\n\nDiffContext.prototype.setResult = function(result) {\n  if (this.options.cloneDiffValues && typeof result === 'object') {\n    var clone = typeof this.options.cloneDiffValues === 'function' ?\n      this.options.cloneDiffValues : defaultClone;\n    if (typeof result[0] === 'object') {\n      result[0] = clone(result[0]);\n    }\n    if (typeof result[1] === 'object') {\n      result[1] = clone(result[1]);\n    }\n  }\n  return Context.prototype.setResult.apply(this, arguments);\n};\n\nexports.DiffContext = DiffContext;\n","var Context = require('./context').Context;\n\nvar PatchContext = function PatchContext(left, delta) {\n  this.left = left;\n  this.delta = delta;\n  this.pipe = 'patch';\n};\n\nPatchContext.prototype = new Context();\n\nexports.PatchContext = PatchContext;\n","var Context = require('./context').Context;\n\nvar ReverseContext = function ReverseContext(delta) {\n  this.delta = delta;\n  this.pipe = 'reverse';\n};\n\nReverseContext.prototype = new Context();\n\nexports.ReverseContext = ReverseContext;\n","// use as 2nd parameter for JSON.parse to revive Date instances\nmodule.exports = function dateReviver(key, value) {\n  var parts;\n  if (typeof value === 'string') {\n    parts = /^(\\d{4})-(\\d{2})-(\\d{2})T(\\d{2}):(\\d{2}):(\\d{2})(?:\\.(\\d*))?(Z|([+\\-])(\\d{2}):(\\d{2}))$/.exec(value);\n    if (parts) {\n      return new Date(Date.UTC(+parts[1], +parts[2] - 1, +parts[3], +parts[4], +parts[5], +parts[6], +(parts[7] || 0)));\n    }\n  }\n  return value;\n};\n","var Processor = require('./processor').Processor;\nvar Pipe = require('./pipe').Pipe;\nvar DiffContext = require('./contexts/diff').DiffContext;\nvar PatchContext = require('./contexts/patch').PatchContext;\nvar ReverseContext = require('./contexts/reverse').ReverseContext;\n\nvar clone = require('./clone');\n\nvar trivial = require('./filters/trivial');\nvar nested = require('./filters/nested');\nvar arrays = require('./filters/arrays');\nvar dates = require('./filters/dates');\nvar texts = require('./filters/texts');\n\nvar DiffPatcher = function DiffPatcher(options) {\n  this.processor = new Processor(options);\n  this.processor.pipe(new Pipe('diff').append(\n    nested.collectChildrenDiffFilter,\n    trivial.diffFilter,\n    dates.diffFilter,\n    texts.diffFilter,\n    nested.objectsDiffFilter,\n    arrays.diffFilter\n  ).shouldHaveResult());\n  this.processor.pipe(new Pipe('patch').append(\n    nested.collectChildrenPatchFilter,\n    arrays.collectChildrenPatchFilter,\n    trivial.patchFilter,\n    texts.patchFilter,\n    nested.patchFilter,\n    arrays.patchFilter\n  ).shouldHaveResult());\n  this.processor.pipe(new Pipe('reverse').append(\n    nested.collectChildrenReverseFilter,\n    arrays.collectChildrenReverseFilter,\n    trivial.reverseFilter,\n    texts.reverseFilter,\n    nested.reverseFilter,\n    arrays.reverseFilter\n  ).shouldHaveResult());\n};\n\nDiffPatcher.prototype.options = function() {\n  return this.processor.options.apply(this.processor, arguments);\n};\n\nDiffPatcher.prototype.diff = function(left, right) {\n  return this.processor.process(new DiffContext(left, right));\n};\n\nDiffPatcher.prototype.patch = function(left, delta) {\n  return this.processor.process(new PatchContext(left, delta));\n};\n\nDiffPatcher.prototype.reverse = function(delta) {\n  return this.processor.process(new ReverseContext(delta));\n};\n\nDiffPatcher.prototype.unpatch = function(right, delta) {\n  return this.patch(right, this.reverse(delta));\n};\n\nDiffPatcher.prototype.clone = function(value) {\n  return clone(value);\n};\n\nexports.DiffPatcher = DiffPatcher;\n","\nexports.isBrowser = typeof window !== 'undefined';\n","var DiffContext = require('../contexts/diff').DiffContext;\nvar PatchContext = require('../contexts/patch').PatchContext;\nvar ReverseContext = require('../contexts/reverse').ReverseContext;\n\nvar lcs = require('./lcs');\n\nvar ARRAY_MOVE = 3;\n\nvar isArray = (typeof Array.isArray === 'function') ?\n  // use native function\n  Array.isArray :\n  // use instanceof operator\n  function(a) {\n    return a instanceof Array;\n  };\n\nvar arrayIndexOf = typeof Array.prototype.indexOf === 'function' ?\n  function(array, item) {\n    return array.indexOf(item);\n  } : function(array, item) {\n    var length = array.length;\n    for (var i = 0; i < length; i++) {\n      if (array[i] === item) {\n        return i;\n      }\n    }\n    return -1;\n  };\n\nfunction arraysHaveMatchByRef(array1, array2, len1, len2) {\n  for (var index1 = 0; index1 < len1; index1++) {\n    var val1 = array1[index1];\n    for (var index2 = 0; index2 < len2; index2++) {\n      var val2 = array2[index2];\n      if (index1 !== index2 && val1 === val2) {\n        return true;\n      }\n    }\n  }\n}\n\nfunction matchItems(array1, array2, index1, index2, context) {\n  var value1 = array1[index1];\n  var value2 = array2[index2];\n  if (value1 === value2) {\n    return true;\n  }\n  if (typeof value1 !== 'object' || typeof value2 !== 'object') {\n    return false;\n  }\n  var objectHash = context.objectHash;\n  if (!objectHash) {\n    // no way to match objects was provided, try match by position\n    return context.matchByPosition && index1 === index2;\n  }\n  var hash1;\n  var hash2;\n  if (typeof index1 === 'number') {\n    context.hashCache1 = context.hashCache1 || [];\n    hash1 = context.hashCache1[index1];\n    if (typeof hash1 === 'undefined') {\n      context.hashCache1[index1] = hash1 = objectHash(value1, index1);\n    }\n  } else {\n    hash1 = objectHash(value1);\n  }\n  if (typeof hash1 === 'undefined') {\n    return false;\n  }\n  if (typeof index2 === 'number') {\n    context.hashCache2 = context.hashCache2 || [];\n    hash2 = context.hashCache2[index2];\n    if (typeof hash2 === 'undefined') {\n      context.hashCache2[index2] = hash2 = objectHash(value2, index2);\n    }\n  } else {\n    hash2 = objectHash(value2);\n  }\n  if (typeof hash2 === 'undefined') {\n    return false;\n  }\n  return hash1 === hash2;\n}\n\nvar diffFilter = function arraysDiffFilter(context) {\n  if (!context.leftIsArray) {\n    return;\n  }\n\n  var matchContext = {\n    objectHash: context.options && context.options.objectHash,\n    matchByPosition: context.options && context.options.matchByPosition\n  };\n  var commonHead = 0;\n  var commonTail = 0;\n  var index;\n  var index1;\n  var index2;\n  var array1 = context.left;\n  var array2 = context.right;\n  var len1 = array1.length;\n  var len2 = array2.length;\n\n  var child;\n\n  if (len1 > 0 && len2 > 0 && !matchContext.objectHash &&\n    typeof matchContext.matchByPosition !== 'boolean') {\n    matchContext.matchByPosition = !arraysHaveMatchByRef(array1, array2, len1, len2);\n  }\n\n  // separate common head\n  while (commonHead < len1 && commonHead < len2 &&\n    matchItems(array1, array2, commonHead, commonHead, matchContext)) {\n    index = commonHead;\n    child = new DiffContext(context.left[index], context.right[index]);\n    context.push(child, index);\n    commonHead++;\n  }\n  // separate common tail\n  while (commonTail + commonHead < len1 && commonTail + commonHead < len2 &&\n    matchItems(array1, array2, len1 - 1 - commonTail, len2 - 1 - commonTail, matchContext)) {\n    index1 = len1 - 1 - commonTail;\n    index2 = len2 - 1 - commonTail;\n    child = new DiffContext(context.left[index1], context.right[index2]);\n    context.push(child, index2);\n    commonTail++;\n  }\n  var result;\n  if (commonHead + commonTail === len1) {\n    if (len1 === len2) {\n      // arrays are identical\n      context.setResult(undefined).exit();\n      return;\n    }\n    // trivial case, a block (1 or more consecutive items) was added\n    result = result || {\n      _t: 'a'\n    };\n    for (index = commonHead; index < len2 - commonTail; index++) {\n      result[index] = [array2[index]];\n    }\n    context.setResult(result).exit();\n    return;\n  }\n  if (commonHead + commonTail === len2) {\n    // trivial case, a block (1 or more consecutive items) was removed\n    result = result || {\n      _t: 'a'\n    };\n    for (index = commonHead; index < len1 - commonTail; index++) {\n      result['_' + index] = [array1[index], 0, 0];\n    }\n    context.setResult(result).exit();\n    return;\n  }\n  // reset hash cache\n  delete matchContext.hashCache1;\n  delete matchContext.hashCache2;\n\n  // diff is not trivial, find the LCS (Longest Common Subsequence)\n  var trimmed1 = array1.slice(commonHead, len1 - commonTail);\n  var trimmed2 = array2.slice(commonHead, len2 - commonTail);\n  var seq = lcs.get(\n    trimmed1, trimmed2,\n    matchItems,\n    matchContext\n  );\n  var removedItems = [];\n  result = result || {\n    _t: 'a'\n  };\n  for (index = commonHead; index < len1 - commonTail; index++) {\n    if (arrayIndexOf(seq.indices1, index - commonHead) < 0) {\n      // removed\n      result['_' + index] = [array1[index], 0, 0];\n      removedItems.push(index);\n    }\n  }\n\n  var detectMove = true;\n  if (context.options && context.options.arrays && context.options.arrays.detectMove === false) {\n    detectMove = false;\n  }\n  var includeValueOnMove = false;\n  if (context.options && context.options.arrays && context.options.arrays.includeValueOnMove) {\n    includeValueOnMove = true;\n  }\n\n  var removedItemsLength = removedItems.length;\n  for (index = commonHead; index < len2 - commonTail; index++) {\n    var indexOnArray2 = arrayIndexOf(seq.indices2, index - commonHead);\n    if (indexOnArray2 < 0) {\n      // added, try to match with a removed item and register as position move\n      var isMove = false;\n      if (detectMove && removedItemsLength > 0) {\n        for (var removeItemIndex1 = 0; removeItemIndex1 < removedItemsLength; removeItemIndex1++) {\n          index1 = removedItems[removeItemIndex1];\n          if (matchItems(trimmed1, trimmed2, index1 - commonHead,\n            index - commonHead, matchContext)) {\n            // store position move as: [originalValue, newPosition, ARRAY_MOVE]\n            result['_' + index1].splice(1, 2, index, ARRAY_MOVE);\n            if (!includeValueOnMove) {\n              // don't include moved value on diff, to save bytes\n              result['_' + index1][0] = '';\n            }\n\n            index2 = index;\n            child = new DiffContext(context.left[index1], context.right[index2]);\n            context.push(child, index2);\n            removedItems.splice(removeItemIndex1, 1);\n            isMove = true;\n            break;\n          }\n        }\n      }\n      if (!isMove) {\n        // added\n        result[index] = [array2[index]];\n      }\n    } else {\n      // match, do inner diff\n      index1 = seq.indices1[indexOnArray2] + commonHead;\n      index2 = seq.indices2[indexOnArray2] + commonHead;\n      child = new DiffContext(context.left[index1], context.right[index2]);\n      context.push(child, index2);\n    }\n  }\n\n  context.setResult(result).exit();\n\n};\ndiffFilter.filterName = 'arrays';\n\nvar compare = {\n  numerically: function(a, b) {\n    return a - b;\n  },\n  numericallyBy: function(name) {\n    return function(a, b) {\n      return a[name] - b[name];\n    };\n  }\n};\n\nvar patchFilter = function nestedPatchFilter(context) {\n  if (!context.nested) {\n    return;\n  }\n  if (context.delta._t !== 'a') {\n    return;\n  }\n  var index, index1;\n\n  var delta = context.delta;\n  var array = context.left;\n\n  // first, separate removals, insertions and modifications\n  var toRemove = [];\n  var toInsert = [];\n  var toModify = [];\n  for (index in delta) {\n    if (index !== '_t') {\n      if (index[0] === '_') {\n        // removed item from original array\n        if (delta[index][2] === 0 || delta[index][2] === ARRAY_MOVE) {\n          toRemove.push(parseInt(index.slice(1), 10));\n        } else {\n          throw new Error('only removal or move can be applied at original array indices' +\n            ', invalid diff type: ' + delta[index][2]);\n        }\n      } else {\n        if (delta[index].length === 1) {\n          // added item at new array\n          toInsert.push({\n            index: parseInt(index, 10),\n            value: delta[index][0]\n          });\n        } else {\n          // modified item at new array\n          toModify.push({\n            index: parseInt(index, 10),\n            delta: delta[index]\n          });\n        }\n      }\n    }\n  }\n\n  // remove items, in reverse order to avoid sawing our own floor\n  toRemove = toRemove.sort(compare.numerically);\n  for (index = toRemove.length - 1; index >= 0; index--) {\n    index1 = toRemove[index];\n    var indexDiff = delta['_' + index1];\n    var removedValue = array.splice(index1, 1)[0];\n    if (indexDiff[2] === ARRAY_MOVE) {\n      // reinsert later\n      toInsert.push({\n        index: indexDiff[1],\n        value: removedValue\n      });\n    }\n  }\n\n  // insert items, in reverse order to avoid moving our own floor\n  toInsert = toInsert.sort(compare.numericallyBy('index'));\n  var toInsertLength = toInsert.length;\n  for (index = 0; index < toInsertLength; index++) {\n    var insertion = toInsert[index];\n    array.splice(insertion.index, 0, insertion.value);\n  }\n\n  // apply modifications\n  var toModifyLength = toModify.length;\n  var child;\n  if (toModifyLength > 0) {\n    for (index = 0; index < toModifyLength; index++) {\n      var modification = toModify[index];\n      child = new PatchContext(context.left[modification.index], modification.delta);\n      context.push(child, modification.index);\n    }\n  }\n\n  if (!context.children) {\n    context.setResult(context.left).exit();\n    return;\n  }\n  context.exit();\n};\npatchFilter.filterName = 'arrays';\n\nvar collectChildrenPatchFilter = function collectChildrenPatchFilter(context) {\n  if (!context || !context.children) {\n    return;\n  }\n  if (context.delta._t !== 'a') {\n    return;\n  }\n  var length = context.children.length;\n  var child;\n  for (var index = 0; index < length; index++) {\n    child = context.children[index];\n    context.left[child.childName] = child.result;\n  }\n  context.setResult(context.left).exit();\n};\ncollectChildrenPatchFilter.filterName = 'arraysCollectChildren';\n\nvar reverseFilter = function arraysReverseFilter(context) {\n  if (!context.nested) {\n    if (context.delta[2] === ARRAY_MOVE) {\n      context.newName = '_' + context.delta[1];\n      context.setResult([context.delta[0], parseInt(context.childName.substr(1), 10), ARRAY_MOVE]).exit();\n    }\n    return;\n  }\n  if (context.delta._t !== 'a') {\n    return;\n  }\n  var name, child;\n  for (name in context.delta) {\n    if (name === '_t') {\n      continue;\n    }\n    child = new ReverseContext(context.delta[name]);\n    context.push(child, name);\n  }\n  context.exit();\n};\nreverseFilter.filterName = 'arrays';\n\nvar reverseArrayDeltaIndex = function(delta, index, itemDelta) {\n  if (typeof index === 'string' && index[0] === '_') {\n    return parseInt(index.substr(1), 10);\n  } else if (isArray(itemDelta) && itemDelta[2] === 0) {\n    return '_' + index;\n  }\n\n  var reverseIndex = +index;\n  for (var deltaIndex in delta) {\n    var deltaItem = delta[deltaIndex];\n    if (isArray(deltaItem)) {\n      if (deltaItem[2] === ARRAY_MOVE) {\n        var moveFromIndex = parseInt(deltaIndex.substr(1), 10);\n        var moveToIndex = deltaItem[1];\n        if (moveToIndex === +index) {\n          return moveFromIndex;\n        }\n        if (moveFromIndex <= reverseIndex && moveToIndex > reverseIndex) {\n          reverseIndex++;\n        } else if (moveFromIndex >= reverseIndex && moveToIndex < reverseIndex) {\n          reverseIndex--;\n        }\n      } else if (deltaItem[2] === 0) {\n        var deleteIndex = parseInt(deltaIndex.substr(1), 10);\n        if (deleteIndex <= reverseIndex) {\n          reverseIndex++;\n        }\n      } else if (deltaItem.length === 1 && deltaIndex <= reverseIndex) {\n        reverseIndex--;\n      }\n    }\n  }\n\n  return reverseIndex;\n};\n\nvar collectChildrenReverseFilter = function collectChildrenReverseFilter(context) {\n  if (!context || !context.children) {\n    return;\n  }\n  if (context.delta._t !== 'a') {\n    return;\n  }\n  var length = context.children.length;\n  var child;\n  var delta = {\n    _t: 'a'\n  };\n\n  for (var index = 0; index < length; index++) {\n    child = context.children[index];\n    var name = child.newName;\n    if (typeof name === 'undefined') {\n      name = reverseArrayDeltaIndex(context.delta, child.childName, child.result);\n    }\n    if (delta[name] !== child.result) {\n      delta[name] = child.result;\n    }\n  }\n  context.setResult(delta).exit();\n};\ncollectChildrenReverseFilter.filterName = 'arraysCollectChildren';\n\nexports.diffFilter = diffFilter;\nexports.patchFilter = patchFilter;\nexports.collectChildrenPatchFilter = collectChildrenPatchFilter;\nexports.reverseFilter = reverseFilter;\nexports.collectChildrenReverseFilter = collectChildrenReverseFilter;\n","var diffFilter = function datesDiffFilter(context) {\n  if (context.left instanceof Date) {\n    if (context.right instanceof Date) {\n      if (context.left.getTime() !== context.right.getTime()) {\n        context.setResult([context.left, context.right]);\n      } else {\n        context.setResult(undefined);\n      }\n    } else {\n      context.setResult([context.left, context.right]);\n    }\n    context.exit();\n  } else if (context.right instanceof Date) {\n    context.setResult([context.left, context.right]).exit();\n  }\n};\ndiffFilter.filterName = 'dates';\n\nexports.diffFilter = diffFilter;\n","/*\n\nLCS implementation that supports arrays or strings\n\nreference: http://en.wikipedia.org/wiki/Longest_common_subsequence_problem\n\n*/\n\nvar defaultMatch = function(array1, array2, index1, index2) {\n  return array1[index1] === array2[index2];\n};\n\nvar lengthMatrix = function(array1, array2, match, context) {\n  var len1 = array1.length;\n  var len2 = array2.length;\n  var x, y;\n\n  // initialize empty matrix of len1+1 x len2+1\n  var matrix = [len1 + 1];\n  for (x = 0; x < len1 + 1; x++) {\n    matrix[x] = [len2 + 1];\n    for (y = 0; y < len2 + 1; y++) {\n      matrix[x][y] = 0;\n    }\n  }\n  matrix.match = match;\n  // save sequence lengths for each coordinate\n  for (x = 1; x < len1 + 1; x++) {\n    for (y = 1; y < len2 + 1; y++) {\n      if (match(array1, array2, x - 1, y - 1, context)) {\n        matrix[x][y] = matrix[x - 1][y - 1] + 1;\n      } else {\n        matrix[x][y] = Math.max(matrix[x - 1][y], matrix[x][y - 1]);\n      }\n    }\n  }\n  return matrix;\n};\n\nvar backtrack = function(matrix, array1, array2, index1, index2, context) {\n  if (index1 === 0 || index2 === 0) {\n    return {\n      sequence: [],\n      indices1: [],\n      indices2: []\n    };\n  }\n\n  if (matrix.match(array1, array2, index1 - 1, index2 - 1, context)) {\n    var subsequence = backtrack(matrix, array1, array2, index1 - 1, index2 - 1, context);\n    subsequence.sequence.push(array1[index1 - 1]);\n    subsequence.indices1.push(index1 - 1);\n    subsequence.indices2.push(index2 - 1);\n    return subsequence;\n  }\n\n  if (matrix[index1][index2 - 1] > matrix[index1 - 1][index2]) {\n    return backtrack(matrix, array1, array2, index1, index2 - 1, context);\n  } else {\n    return backtrack(matrix, array1, array2, index1 - 1, index2, context);\n  }\n};\n\nvar get = function(array1, array2, match, context) {\n  context = context || {};\n  var matrix = lengthMatrix(array1, array2, match || defaultMatch, context);\n  var result = backtrack(matrix, array1, array2, array1.length, array2.length, context);\n  if (typeof array1 === 'string' && typeof array2 === 'string') {\n    result.sequence = result.sequence.join('');\n  }\n  return result;\n};\n\nexports.get = get;\n","var DiffContext = require('../contexts/diff').DiffContext;\nvar PatchContext = require('../contexts/patch').PatchContext;\nvar ReverseContext = require('../contexts/reverse').ReverseContext;\n\nvar collectChildrenDiffFilter = function collectChildrenDiffFilter(context) {\n  if (!context || !context.children) {\n    return;\n  }\n  var length = context.children.length;\n  var child;\n  var result = context.result;\n  for (var index = 0; index < length; index++) {\n    child = context.children[index];\n    if (typeof child.result === 'undefined') {\n      continue;\n    }\n    result = result || {};\n    result[child.childName] = child.result;\n  }\n  if (result && context.leftIsArray) {\n    result._t = 'a';\n  }\n  context.setResult(result).exit();\n};\ncollectChildrenDiffFilter.filterName = 'collectChildren';\n\nvar objectsDiffFilter = function objectsDiffFilter(context) {\n  if (context.leftIsArray || context.leftType !== 'object') {\n    return;\n  }\n\n  var name, child, propertyFilter = context.options.propertyFilter;\n  for (name in context.left) {\n    if (!Object.prototype.hasOwnProperty.call(context.left, name)) {\n      continue;\n    }\n    if (propertyFilter && !propertyFilter(name, context)) {\n      continue;\n    }\n    child = new DiffContext(context.left[name], context.right[name]);\n    context.push(child, name);\n  }\n  for (name in context.right) {\n    if (!Object.prototype.hasOwnProperty.call(context.right, name)) {\n      continue;\n    }\n    if (propertyFilter && !propertyFilter(name, context)) {\n      continue;\n    }\n    if (typeof context.left[name] === 'undefined') {\n      child = new DiffContext(undefined, context.right[name]);\n      context.push(child, name);\n    }\n  }\n\n  if (!context.children || context.children.length === 0) {\n    context.setResult(undefined).exit();\n    return;\n  }\n  context.exit();\n};\nobjectsDiffFilter.filterName = 'objects';\n\nvar patchFilter = function nestedPatchFilter(context) {\n  if (!context.nested) {\n    return;\n  }\n  if (context.delta._t) {\n    return;\n  }\n  var name, child;\n  for (name in context.delta) {\n    child = new PatchContext(context.left[name], context.delta[name]);\n    context.push(child, name);\n  }\n  context.exit();\n};\npatchFilter.filterName = 'objects';\n\nvar collectChildrenPatchFilter = function collectChildrenPatchFilter(context) {\n  if (!context || !context.children) {\n    return;\n  }\n  if (context.delta._t) {\n    return;\n  }\n  var length = context.children.length;\n  var child;\n  for (var index = 0; index < length; index++) {\n    child = context.children[index];\n    if (Object.prototype.hasOwnProperty.call(context.left, child.childName) && child.result === undefined) {\n      delete context.left[child.childName];\n    } else if (context.left[child.childName] !== child.result) {\n      context.left[child.childName] = child.result;\n    }\n  }\n  context.setResult(context.left).exit();\n};\ncollectChildrenPatchFilter.filterName = 'collectChildren';\n\nvar reverseFilter = function nestedReverseFilter(context) {\n  if (!context.nested) {\n    return;\n  }\n  if (context.delta._t) {\n    return;\n  }\n  var name, child;\n  for (name in context.delta) {\n    child = new ReverseContext(context.delta[name]);\n    context.push(child, name);\n  }\n  context.exit();\n};\nreverseFilter.filterName = 'objects';\n\nvar collectChildrenReverseFilter = function collectChildrenReverseFilter(context) {\n  if (!context || !context.children) {\n    return;\n  }\n  if (context.delta._t) {\n    return;\n  }\n  var length = context.children.length;\n  var child;\n  var delta = {};\n  for (var index = 0; index < length; index++) {\n    child = context.children[index];\n    if (delta[child.childName] !== child.result) {\n      delta[child.childName] = child.result;\n    }\n  }\n  context.setResult(delta).exit();\n};\ncollectChildrenReverseFilter.filterName = 'collectChildren';\n\nexports.collectChildrenDiffFilter = collectChildrenDiffFilter;\nexports.objectsDiffFilter = objectsDiffFilter;\nexports.patchFilter = patchFilter;\nexports.collectChildrenPatchFilter = collectChildrenPatchFilter;\nexports.reverseFilter = reverseFilter;\nexports.collectChildrenReverseFilter = collectChildrenReverseFilter;\n","/* global diff_match_patch */\nvar TEXT_DIFF = 2;\nvar DEFAULT_MIN_LENGTH = 60;\nvar cachedDiffPatch = null;\n\nvar getDiffMatchPatch = function(required) {\n  /*jshint camelcase: false */\n\n  if (!cachedDiffPatch) {\n    var instance;\n    if (typeof diff_match_patch !== 'undefined') {\n      // already loaded, probably a browser\n      instance = typeof diff_match_patch === 'function' ?\n        new diff_match_patch() : new diff_match_patch.diff_match_patch();\n    } else if (typeof require === 'function') {\n      try {\n        var dmpModuleName = 'diff_match_patch_uncompressed';\n        var dmp = require('../../public/external/' + dmpModuleName);\n        instance = new dmp.diff_match_patch();\n      } catch (err) {\n        instance = null;\n      }\n    }\n    if (!instance) {\n      if (!required) {\n        return null;\n      }\n      var error = new Error('text diff_match_patch library not found');\n      error.diff_match_patch_not_found = true;\n      throw error;\n    }\n    cachedDiffPatch = {\n      diff: function(txt1, txt2) {\n        return instance.patch_toText(instance.patch_make(txt1, txt2));\n      },\n      patch: function(txt1, patch) {\n        var results = instance.patch_apply(instance.patch_fromText(patch), txt1);\n        for (var i = 0; i < results[1].length; i++) {\n          if (!results[1][i]) {\n            var error = new Error('text patch failed');\n            error.textPatchFailed = true;\n          }\n        }\n        return results[0];\n      }\n    };\n  }\n  return cachedDiffPatch;\n};\n\nvar diffFilter = function textsDiffFilter(context) {\n  if (context.leftType !== 'string') {\n    return;\n  }\n  var minLength = (context.options && context.options.textDiff &&\n    context.options.textDiff.minLength) || DEFAULT_MIN_LENGTH;\n  if (context.left.length < minLength ||\n    context.right.length < minLength) {\n    context.setResult([context.left, context.right]).exit();\n    return;\n  }\n  // large text, try to use a text-diff algorithm\n  var diffMatchPatch = getDiffMatchPatch();\n  if (!diffMatchPatch) {\n    // diff-match-patch library not available, fallback to regular string replace\n    context.setResult([context.left, context.right]).exit();\n    return;\n  }\n  var diff = diffMatchPatch.diff;\n  context.setResult([diff(context.left, context.right), 0, TEXT_DIFF]).exit();\n};\ndiffFilter.filterName = 'texts';\n\nvar patchFilter = function textsPatchFilter(context) {\n  if (context.nested) {\n    return;\n  }\n  if (context.delta[2] !== TEXT_DIFF) {\n    return;\n  }\n\n  // text-diff, use a text-patch algorithm\n  var patch = getDiffMatchPatch(true).patch;\n  context.setResult(patch(context.left, context.delta[0])).exit();\n};\npatchFilter.filterName = 'texts';\n\nvar textDeltaReverse = function(delta) {\n  var i, l, lines, line, lineTmp, header = null,\n    headerRegex = /^@@ +\\-(\\d+),(\\d+) +\\+(\\d+),(\\d+) +@@$/,\n    lineHeader, lineAdd, lineRemove;\n  lines = delta.split('\\n');\n  for (i = 0, l = lines.length; i < l; i++) {\n    line = lines[i];\n    var lineStart = line.slice(0, 1);\n    if (lineStart === '@') {\n      header = headerRegex.exec(line);\n      lineHeader = i;\n      lineAdd = null;\n      lineRemove = null;\n\n      // fix header\n      lines[lineHeader] = '@@ -' + header[3] + ',' + header[4] + ' +' + header[1] + ',' + header[2] + ' @@';\n    } else if (lineStart === '+') {\n      lineAdd = i;\n      lines[i] = '-' + lines[i].slice(1);\n      if (lines[i - 1].slice(0, 1) === '+') {\n        // swap lines to keep default order (-+)\n        lineTmp = lines[i];\n        lines[i] = lines[i - 1];\n        lines[i - 1] = lineTmp;\n      }\n    } else if (lineStart === '-') {\n      lineRemove = i;\n      lines[i] = '+' + lines[i].slice(1);\n    }\n  }\n  return lines.join('\\n');\n};\n\nvar reverseFilter = function textsReverseFilter(context) {\n  if (context.nested) {\n    return;\n  }\n  if (context.delta[2] !== TEXT_DIFF) {\n    return;\n  }\n\n  // text-diff, use a text-diff algorithm\n  context.setResult([textDeltaReverse(context.delta[0]), 0, TEXT_DIFF]).exit();\n};\nreverseFilter.filterName = 'texts';\n\nexports.diffFilter = diffFilter;\nexports.patchFilter = patchFilter;\nexports.reverseFilter = reverseFilter;\n","var isArray = (typeof Array.isArray === 'function') ?\n  // use native function\n  Array.isArray :\n  // use instanceof operator\n  function(a) {\n    return a instanceof Array;\n  };\n\nvar diffFilter = function trivialMatchesDiffFilter(context) {\n  if (context.left === context.right) {\n    context.setResult(undefined).exit();\n    return;\n  }\n  if (typeof context.left === 'undefined') {\n    if (typeof context.right === 'function') {\n      throw new Error('functions are not supported');\n    }\n    context.setResult([context.right]).exit();\n    return;\n  }\n  if (typeof context.right === 'undefined') {\n    context.setResult([context.left, 0, 0]).exit();\n    return;\n  }\n  if (typeof context.left === 'function' || typeof context.right === 'function') {\n    throw new Error('functions are not supported');\n  }\n  context.leftType = context.left === null ? 'null' : typeof context.left;\n  context.rightType = context.right === null ? 'null' : typeof context.right;\n  if (context.leftType !== context.rightType) {\n    context.setResult([context.left, context.right]).exit();\n    return;\n  }\n  if (context.leftType === 'boolean' || context.leftType === 'number') {\n    context.setResult([context.left, context.right]).exit();\n    return;\n  }\n  if (context.leftType === 'object') {\n    context.leftIsArray = isArray(context.left);\n  }\n  if (context.rightType === 'object') {\n    context.rightIsArray = isArray(context.right);\n  }\n  if (context.leftIsArray !== context.rightIsArray) {\n    context.setResult([context.left, context.right]).exit();\n    return;\n  }\n\n  if (context.left instanceof RegExp) {\n    if (context.right instanceof RegExp) {\n      context.setResult([context.left.toString(), context.right.toString()]).exit();\n    } else {\n      context.setResult([context.left, context.right]).exit();\n      return;\n    }\n  }\n};\ndiffFilter.filterName = 'trivial';\n\nvar patchFilter = function trivialMatchesPatchFilter(context) {\n  if (typeof context.delta === 'undefined') {\n    context.setResult(context.left).exit();\n    return;\n  }\n  context.nested = !isArray(context.delta);\n  if (context.nested) {\n    return;\n  }\n  if (context.delta.length === 1) {\n    context.setResult(context.delta[0]).exit();\n    return;\n  }\n  if (context.delta.length === 2) {\n    if (context.left instanceof RegExp) {\n      var regexArgs = /^\\/(.*)\\/([gimyu]+)$/.exec(context.delta[1]);\n      if (regexArgs) {\n        context.setResult(new RegExp(regexArgs[1], regexArgs[2])).exit();\n        return;\n      }\n    }\n    context.setResult(context.delta[1]).exit();\n    return;\n  }\n  if (context.delta.length === 3 && context.delta[2] === 0) {\n    context.setResult(undefined).exit();\n    return;\n  }\n};\npatchFilter.filterName = 'trivial';\n\nvar reverseFilter = function trivialReferseFilter(context) {\n  if (typeof context.delta === 'undefined') {\n    context.setResult(context.delta).exit();\n    return;\n  }\n  context.nested = !isArray(context.delta);\n  if (context.nested) {\n    return;\n  }\n  if (context.delta.length === 1) {\n    context.setResult([context.delta[0], 0, 0]).exit();\n    return;\n  }\n  if (context.delta.length === 2) {\n    context.setResult([context.delta[1], context.delta[0]]).exit();\n    return;\n  }\n  if (context.delta.length === 3 && context.delta[2] === 0) {\n    context.setResult([context.delta[0]]).exit();\n    return;\n  }\n};\nreverseFilter.filterName = 'trivial';\n\nexports.diffFilter = diffFilter;\nexports.patchFilter = patchFilter;\nexports.reverseFilter = reverseFilter;\n","\nvar environment = require('./environment');\n\nvar DiffPatcher = require('./diffpatcher').DiffPatcher;\nexports.DiffPatcher = DiffPatcher;\n\nexports.create = function(options){\n  return new DiffPatcher(options);\n};\n\nexports.dateReviver = require('./date-reviver');\n\nvar defaultInstance;\n\nexports.diff = function() {\n  if (!defaultInstance) {\n    defaultInstance = new DiffPatcher();\n  }\n  return defaultInstance.diff.apply(defaultInstance, arguments);\n};\n\nexports.patch = function() {\n  if (!defaultInstance) {\n    defaultInstance = new DiffPatcher();\n  }\n  return defaultInstance.patch.apply(defaultInstance, arguments);\n};\n\nexports.unpatch = function() {\n  if (!defaultInstance) {\n    defaultInstance = new DiffPatcher();\n  }\n  return defaultInstance.unpatch.apply(defaultInstance, arguments);\n};\n\nexports.reverse = function() {\n  if (!defaultInstance) {\n    defaultInstance = new DiffPatcher();\n  }\n  return defaultInstance.reverse.apply(defaultInstance, arguments);\n};\n\nexports.clone = function() {\n  if (!defaultInstance) {\n    defaultInstance = new DiffPatcher();\n  }\n  return defaultInstance.clone.apply(defaultInstance, arguments);\n};\n\n\nif (environment.isBrowser) {\n  exports.homepage = '{{package-homepage}}';\n  exports.version = '{{package-version}}';\n} else {\n  var packageInfoModuleName = '../package.json';\n  var packageInfo = require(packageInfoModuleName);\n  exports.homepage = packageInfo.homepage;\n  exports.version = packageInfo.version;\n\n  var formatterModuleName = './formatters';\n  var formatters = require(formatterModuleName);\n  exports.formatters = formatters;\n  // shortcut for console\n  exports.console = formatters.console;\n}\n","var Pipe = function Pipe(name) {\n  this.name = name;\n  this.filters = [];\n};\n\nPipe.prototype.process = function(input) {\n  if (!this.processor) {\n    throw new Error('add this pipe to a processor before using it');\n  }\n  var debug = this.debug;\n  var length = this.filters.length;\n  var context = input;\n  for (var index = 0; index < length; index++) {\n    var filter = this.filters[index];\n    if (debug) {\n      this.log('filter: ' + filter.filterName);\n    }\n    filter(context);\n    if (typeof context === 'object' && context.exiting) {\n      context.exiting = false;\n      break;\n    }\n  }\n  if (!context.next && this.resultCheck) {\n    this.resultCheck(context);\n  }\n};\n\nPipe.prototype.log = function(msg) {\n  console.log('[jsondiffpatch] ' + this.name + ' pipe, ' + msg);\n};\n\nPipe.prototype.append = function() {\n  this.filters.push.apply(this.filters, arguments);\n  return this;\n};\n\nPipe.prototype.prepend = function() {\n  this.filters.unshift.apply(this.filters, arguments);\n  return this;\n};\n\nPipe.prototype.indexOf = function(filterName) {\n  if (!filterName) {\n    throw new Error('a filter name is required');\n  }\n  for (var index = 0; index < this.filters.length; index++) {\n    var filter = this.filters[index];\n    if (filter.filterName === filterName) {\n      return index;\n    }\n  }\n  throw new Error('filter not found: ' + filterName);\n};\n\nPipe.prototype.list = function() {\n  var names = [];\n  for (var index = 0; index < this.filters.length; index++) {\n    var filter = this.filters[index];\n    names.push(filter.filterName);\n  }\n  return names;\n};\n\nPipe.prototype.after = function(filterName) {\n  var index = this.indexOf(filterName);\n  var params = Array.prototype.slice.call(arguments, 1);\n  if (!params.length) {\n    throw new Error('a filter is required');\n  }\n  params.unshift(index + 1, 0);\n  Array.prototype.splice.apply(this.filters, params);\n  return this;\n};\n\nPipe.prototype.before = function(filterName) {\n  var index = this.indexOf(filterName);\n  var params = Array.prototype.slice.call(arguments, 1);\n  if (!params.length) {\n    throw new Error('a filter is required');\n  }\n  params.unshift(index, 0);\n  Array.prototype.splice.apply(this.filters, params);\n  return this;\n};\n\nPipe.prototype.clear = function() {\n  this.filters.length = 0;\n  return this;\n};\n\nPipe.prototype.shouldHaveResult = function(should) {\n  if (should === false) {\n    this.resultCheck = null;\n    return;\n  }\n  if (this.resultCheck) {\n    return;\n  }\n  var pipe = this;\n  this.resultCheck = function(context) {\n    if (!context.hasResult) {\n      console.log(context);\n      var error = new Error(pipe.name + ' failed');\n      error.noResult = true;\n      throw error;\n    }\n  };\n  return this;\n};\n\nexports.Pipe = Pipe;\n","\nvar Processor = function Processor(options){\n  this.selfOptions = options || {};\n  this.pipes = {};\n};\n\nProcessor.prototype.options = function(options) {\n  if (options) {\n    this.selfOptions = options;\n  }\n  return this.selfOptions;\n};\n\nProcessor.prototype.pipe = function(name, pipe) {\n  if (typeof name === 'string') {\n    if (typeof pipe === 'undefined') {\n      return this.pipes[name];\n    } else {\n      this.pipes[name] = pipe;\n    }\n  }\n  if (name && name.name) {\n    pipe = name;\n    if (pipe.processor === this) { return pipe; }\n    this.pipes[pipe.name] = pipe;\n  }\n  pipe.processor = this;\n  return pipe;\n};\n\nProcessor.prototype.process = function(input, pipe) {\n  var context = input;\n  context.options = this.options();\n  var nextPipe = pipe || input.pipe || 'default';\n  var lastPipe, lastContext;\n  while (nextPipe) {\n    if (typeof context.nextAfterChildren !== 'undefined') {\n      // children processed and coming back to parent\n      context.next = context.nextAfterChildren;\n      context.nextAfterChildren = null;\n    }\n\n    if (typeof nextPipe === 'string') {\n      nextPipe = this.pipe(nextPipe);\n    }\n    nextPipe.process(context);\n    lastContext = context;\n    lastPipe = nextPipe;\n    nextPipe = null;\n    if (context) {\n      if (context.next) {\n        context = context.next;\n        nextPipe = lastContext.nextPipe || context.pipe || lastPipe;\n      }\n    }\n  }\n  return context.hasResult ? context.result : undefined;\n};\n\nexports.Processor = Processor;\n"]}