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* Diff Match and Patch\n * Copyright 2018 The diff-match-patch Authors.\n * https://github.com/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 */\nvar diff_match_patch = function() {\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 do\n // the contents have to be 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/**\n * Class representing one diff tuple.\n * ~Attempts to look like a two-element array (which is what this used to be).~\n * Constructor returns an actual two-element array, to allow destructing @JackuB\n * See https://github.com/JackuB/diff-match-patch/issues/14 for details\n * @param {number} op Operation, one of: DIFF_DELETE, DIFF_INSERT, DIFF_EQUAL.\n * @param {string} text Text to be deleted, inserted, or retained.\n * @constructor\n */\ndiff_match_patch.Diff = function(op, text) {\n return [op, text];\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 [new diff_match_patch.Diff(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(new diff_match_patch.Diff(DIFF_EQUAL, commonprefix));\n }\n if (commonsuffix) {\n diffs.push(new diff_match_patch.Diff(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 [new diff_match_patch.Diff(DIFF_INSERT, text2)];\n }\n\n if (!text2) {\n // Just delete some text (speedup).\n return [new diff_match_patch.Diff(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 = [new diff_match_patch.Diff(DIFF_INSERT, longtext.substring(0, i)),\n new diff_match_patch.Diff(DIFF_EQUAL, shorttext),\n new diff_match_patch.Diff(DIFF_INSERT,\n 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 [new diff_match_patch.Diff(DIFF_DELETE, text1),\n new diff_match_patch.Diff(DIFF_INSERT, text2)];\n }\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([new diff_match_patch.Diff(DIFF_EQUAL, mid_common)],\n 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 = a.chars1;\n text2 = a.chars2;\n var linearray = a.lineArray;\n\n var diffs = this.diff_main(text1, text2, false, 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(new diff_match_patch.Diff(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 diffs.splice(pointer - count_delete - count_insert,\n count_delete + count_insert);\n pointer = pointer - count_delete - count_insert;\n var subDiff =\n this.diff_main(text_delete, text_insert, false, deadline);\n for (var j = subDiff.length - 1; j >= 0; j--) {\n diffs.splice(pointer, 0, subDiff[j]);\n }\n pointer = pointer + subDiff.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 [new diff_match_patch.Diff(DIFF_DELETE, text1),\n new diff_match_patch.Diff(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 {{chars1: string, chars2: string, lineArray: !Array.<string>}}\n * An object containing the encoded text1, the encoded text2 and\n * the array of unique strings.\n * The 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\n if (lineHash.hasOwnProperty ? lineHash.hasOwnProperty(line) :\n (lineHash[line] !== undefined)) {\n chars += String.fromCharCode(lineHash[line]);\n } else {\n if (lineArrayLength == maxLines) {\n // Bail out at 65535 because\n // String.fromCharCode(65536) == String.fromCharCode(0)\n line = text.substring(lineStart);\n lineEnd = text.length;\n }\n chars += String.fromCharCode(lineArrayLength);\n lineHash[line] = lineArrayLength;\n lineArray[lineArrayLength++] = line;\n }\n lineStart = lineEnd + 1;\n }\n return chars;\n }\n // Allocate 2/3rds of the space for text1, the rest for text2.\n var maxLines = 40000;\n var chars1 = diff_linesToCharsMunge_(text1);\n maxLines = 65535;\n var chars2 = diff_linesToCharsMunge_(text2);\n return {chars1: chars1, chars2: chars2, lineArray: 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 i = 0; i < diffs.length; i++) {\n var chars = diffs[i][1];\n var text = [];\n for (var j = 0; j < chars.length; j++) {\n text[j] = lineArray[chars.charCodeAt(j)];\n }\n diffs[i][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: https://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: https://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: https://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;\n // Always equal to diffs[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 = 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 && (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 new diff_match_patch.Diff(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 // e.g: <del>xxxabc</del><ins>defxxx</ins>\n // -> <ins>def</ins>xxx<del>abc</del>\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 = diffs[pointer - 1][1];\n var insertion = diffs[pointer][1];\n var overlap_length1 = this.diff_commonOverlap_(deletion, insertion);\n var overlap_length2 = this.diff_commonOverlap_(insertion, deletion);\n if (overlap_length1 >= overlap_length2) {\n if (overlap_length1 >= deletion.length / 2 ||\n overlap_length1 >= insertion.length / 2) {\n // Overlap found. Insert an equality and trim the surrounding edits.\n diffs.splice(pointer, 0, new diff_match_patch.Diff(DIFF_EQUAL,\n insertion.substring(0, overlap_length1)));\n diffs[pointer - 1][1] =\n deletion.substring(0, deletion.length - overlap_length1);\n diffs[pointer + 1][1] = insertion.substring(overlap_length1);\n pointer++;\n }\n } else {\n if (overlap_length2 >= deletion.length / 2 ||\n overlap_length2 >= insertion.length / 2) {\n // Reverse overlap found.\n // Insert an equality and swap and trim the surrounding edits.\n diffs.splice(pointer, 0, new diff_match_patch.Diff(DIFF_EQUAL,\n deletion.substring(0, overlap_length2)));\n diffs[pointer - 1][0] = DIFF_INSERT;\n diffs[pointer - 1][1] =\n insertion.substring(0, insertion.length - overlap_length2);\n diffs[pointer + 1][0] = DIFF_DELETE;\n diffs[pointer + 1][1] =\n deletion.substring(overlap_length2);\n pointer++;\n }\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 /**\n * Given two strings, compute a score representing whether the internal\n * boundary falls on logical boundaries.\n * Scores range from 6 (best) to 0 (worst).\n * Closure, but does not reference any external variables.\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 6;\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 char1 = one.charAt(one.length - 1);\n var char2 = two.charAt(0);\n var nonAlphaNumeric1 = char1.match(diff_match_patch.nonAlphaNumericRegex_);\n var nonAlphaNumeric2 = char2.match(diff_match_patch.nonAlphaNumericRegex_);\n var whitespace1 = nonAlphaNumeric1 &&\n char1.match(diff_match_patch.whitespaceRegex_);\n var whitespace2 = nonAlphaNumeric2 &&\n char2.match(diff_match_patch.whitespaceRegex_);\n var lineBreak1 = whitespace1 &&\n char1.match(diff_match_patch.linebreakRegex_);\n var lineBreak2 = whitespace2 &&\n char2.match(diff_match_patch.linebreakRegex_);\n var blankLine1 = lineBreak1 &&\n one.match(diff_match_patch.blanklineEndRegex_);\n var blankLine2 = lineBreak2 &&\n two.match(diff_match_patch.blanklineStartRegex_);\n\n if (blankLine1 || blankLine2) {\n // Five points for blank lines.\n return 5;\n } else if (lineBreak1 || lineBreak2) {\n // Four points for line breaks.\n return 4;\n } else if (nonAlphaNumeric1 && !whitespace1 && whitespace2) {\n // Three points for end of sentences.\n return 3;\n } else if (whitespace1 || whitespace2) {\n // Two points for whitespace.\n return 2;\n } else if (nonAlphaNumeric1 || nonAlphaNumeric2) {\n // One point for non-alphanumeric.\n return 1;\n }\n return 0;\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 = diffs[pointer - 1][1];\n var edit = diffs[pointer][1];\n var equality2 = 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// Define some regex patterns for matching boundaries.\ndiff_match_patch.nonAlphaNumericRegex_ = /[^a-zA-Z0-9]/;\ndiff_match_patch.whitespaceRegex_ = /\\s/;\ndiff_match_patch.linebreakRegex_ = /[\\r\\n]/;\ndiff_match_patch.blanklineEndRegex_ = /\\n\\r?\\n$/;\ndiff_match_patch.blanklineStartRegex_ = /^\\r?\\n\\r?\\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 /** @type {?string} */\n var lastEquality = null;\n // Always equal to diffs[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 = null;\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 new diff_match_patch.Diff(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 = null;\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 // Add a dummy entry at the end.\n diffs.push(new diff_match_patch.Diff(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 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, new diff_match_patch.Diff(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 pointer -= count_delete + count_insert;\n diffs.splice(pointer, count_delete + count_insert);\n if (text_delete.length) {\n diffs.splice(pointer, 0,\n new diff_match_patch.Diff(DIFF_DELETE, text_delete));\n pointer++;\n }\n if (text_insert.length) {\n diffs.splice(pointer, 0,\n new diff_match_patch.Diff(DIFF_INSERT, text_insert));\n pointer++;\n }\n pointer++;\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 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, '&').replace(pattern_lt, '<')\n .replace(pattern_gt, '>').replace(pattern_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 }\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++] =\n new diff_match_patch.Diff(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++] = new diff_match_patch.Diff(DIFF_EQUAL, text);\n } else {\n diffs[diffsLength++] = new diff_match_patch.Diff(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 if (patch.start2 === null) {\n throw Error('patch not initialized');\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(new diff_match_patch.Diff(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(new diff_match_patch.Diff(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 // https://github.com/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] =\n new diff_match_patch.Diff(patch.diffs[y][0], patch.diffs[y][1]);\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(new diff_match_patch.Diff(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(new diff_match_patch.Diff(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 continue;\n }\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(new diff_match_patch.Diff(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(new diff_match_patch.Diff(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(new diff_match_patch.Diff(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(new diff_match_patch.Diff(DIFF_EQUAL, postcontext));\n }\n }\n if (!empty) {\n patches.splice(++x, 0, patch);\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(new diff_match_patch.Diff(DIFF_DELETE, line));\n } else if (sign == '+') {\n // Insertion.\n patch.diffs.push(new diff_match_patch.Diff(DIFF_INSERT, line));\n } else if (sign == ' ') {\n // Minor equality.\n patch.diffs.push(new diff_match_patch.Diff(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 * Emulate GNU diff's format.\n * Header: @@ -382,8 +481,9 @@\n * Indices 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// The following export code was added by @ForbesLindesay\nmodule.exports = diff_match_patch;\nmodule.exports['diff_match_patch'] = diff_match_patch;\nmodule.exports['DIFF_DELETE'] = DIFF_DELETE;\nmodule.exports['DIFF_INSERT'] = DIFF_INSERT;\nmodule.exports['DIFF_EQUAL'] = DIFF_EQUAL;","// Generated by CoffeeScript 1.9.2\n\n/*\n@preserve jQuery.PrettyTextDiff 1.0.4\nSee https://github.com/arnab/jQuery.PrettyTextDiff/\n */\n\n(function() {\n var $;\n\n $ = jQuery;\n\n $.fn.extend({\n prettyTextDiff: function(options) {\n var dmp, settings;\n settings = {\n originalContainer: \".original\",\n changedContainer: \".changed\",\n diffContainer: \".diff\",\n cleanup: true,\n debug: false\n };\n settings = $.extend(settings, options);\n $.fn.prettyTextDiff.debug(\"Options: \", settings, settings);\n dmp = new diff_match_patch();\n return this.each(function() {\n var changed, diff_as_html, diffs, original;\n if (settings.originalContent && settings.changedContent) {\n original = $('<div />').html(settings.originalContent).text();\n changed = $('<div />').html(settings.changedContent).text();\n } else {\n original = $(settings.originalContainer, this).text();\n changed = $(settings.changedContainer, this).text();\n }\n $.fn.prettyTextDiff.debug(\"Original text found: \", original, settings);\n $.fn.prettyTextDiff.debug(\"Changed text found: \", changed, settings);\n diffs = dmp.diff_main(original, changed);\n if (settings.cleanup) {\n dmp.diff_cleanupSemantic(diffs);\n }\n $.fn.prettyTextDiff.debug(\"Diffs: \", diffs, settings);\n diff_as_html = $.map(diffs, function(diff) {\n return $.fn.prettyTextDiff.createHTML(diff);\n });\n $(settings.diffContainer, this).html(diff_as_html.join(''));\n return this;\n });\n }\n });\n\n $.fn.prettyTextDiff.debug = function(message, object, settings) {\n if (settings.debug) {\n return console.log(message, object);\n }\n };\n\n $.fn.prettyTextDiff.createHTML = function(diff) {\n var data, html, operation, pattern_amp, pattern_gt, pattern_lt, pattern_para, text;\n html = [];\n pattern_amp = /&/g;\n pattern_lt = /</g;\n pattern_gt = />/g;\n pattern_para = /\\n/g;\n operation = diff[0], data = diff[1];\n text = data.replace(pattern_amp, '&').replace(pattern_lt, '<').replace(pattern_gt, '>').replace(pattern_para, '<br>');\n switch (operation) {\n case DIFF_INSERT:\n return '<ins>' + text + '</ins>';\n case DIFF_DELETE:\n return '<del>' + text + '</del>';\n case DIFF_EQUAL:\n return '<span>' + text + '</span>';\n }\n };\n\n}).call(this);\n","// The module cache\nvar __webpack_module_cache__ = {};\n\n// The require function\nfunction __webpack_require__(moduleId) {\n\t// Check if module is in cache\n\tvar cachedModule = __webpack_module_cache__[moduleId];\n\tif (cachedModule !== undefined) {\n\t\treturn cachedModule.exports;\n\t}\n\t// Create a new module (and put it into the cache)\n\tvar module = __webpack_module_cache__[moduleId] = {\n\t\t// no module.id needed\n\t\t// no module.loaded needed\n\t\texports: {}\n\t};\n\n\t// Execute the module function\n\t__webpack_modules__[moduleId].call(module.exports, module, module.exports, __webpack_require__);\n\n\t// Return the exports of the module\n\treturn module.exports;\n}\n\n","/**\n * ---------------------------------------------------------------------\n *\n * GLPI - Gestionnaire Libre de Parc Informatique\n *\n * http://glpi-project.org\n *\n * @copyright 2015-2024 Teclib' and contributors.\n * @copyright 2003-2014 by the INDEPNET Development Team.\n * @licence https://www.gnu.org/licenses/gpl-3.0.html\n *\n * ---------------------------------------------------------------------\n *\n * LICENSE\n *\n * This file is part of GLPI.\n *\n * This program is free software: you can redistribute it and/or modify\n * it under the terms of the GNU General Public License as published by\n * the Free Software Foundation, either version 3 of the License, or\n * (at your option) any later version.\n *\n * This program is distributed in the hope that it will be useful,\n * but WITHOUT ANY WARRANTY; without even the implied warranty of\n * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n * GNU General Public License for more details.\n *\n * You should have received a copy of the GNU General Public License\n * along with this program. If not, see <https://www.gnu.org/licenses/>.\n *\n * ---------------------------------------------------------------------\n */\n\n// diff-match-patch dependency\n// 'diff_match_patch' function and DIFF_* constants have to be declared in global scope\nwindow.diff_match_patch = require('diff-match-patch').diff_match_patch;\nwindow.DIFF_DELETE = require('diff-match-patch').DIFF_DELETE;\nwindow.DIFF_INSERT = require('diff-match-patch').DIFF_INSERT;\nwindow.DIFF_EQUAL = require('diff-match-patch').DIFF_EQUAL;\n\n// PrettyTextDiff jQuery plugin\nrequire('jquery-prettytextdiff');\n\n"],"names":[],"sourceRoot":""}
Mini Shell