From a3ef339ed85184c7294e4648dce31bf635c7fdae Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E5=B0=9A=E5=AF=82=E6=96=B0?= Date: Sat, 26 Dec 2020 18:22:22 +0800 Subject: [PATCH] =?UTF-8?q?Update:=20=E4=B8=A4=E4=B8=AA=E5=9C=A8=20Typecho?= =?UTF-8?q?=20=E6=9C=80=E6=96=B0=E5=BC=80=E5=8F=91=E7=89=88=E9=87=8C=20?= =?UTF-8?q?=E7=BC=BA=E5=B0=91=E7=9A=84=E6=96=87=E4=BB=B6?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- js/diff.js | 2193 ++++++++++++++++++++++++++++++++++++++++++ js/pagedown-extra.js | 873 +++++++++++++++++ 2 files changed, 3066 insertions(+) create mode 100644 js/diff.js create mode 100644 js/pagedown-extra.js diff --git a/js/diff.js b/js/diff.js new file mode 100644 index 0000000..696c1ba --- /dev/null +++ b/js/diff.js @@ -0,0 +1,2193 @@ +/** + * 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 do + // the contents have to be to match the expected contents. (0.0 = perfection, + // 1.0 = very loose). Note that Match_Threshold controls how closely the + // end points of a delete need to match. + this.Patch_DeleteThreshold = 0.5; + // Chunk size for context length. + this.Patch_Margin = 4; + + // The number of bits in an int. + this.Match_MaxBits = 32; +} + + +// DIFF FUNCTIONS + + +/** + * The data structure representing a diff is an array of tuples: + * [[DIFF_DELETE, 'Hello'], [DIFF_INSERT, 'Goodbye'], [DIFF_EQUAL, ' world.']] + * which means: delete 'Hello', add 'Goodbye' and keep ' world.' + */ +var DIFF_DELETE = -1; +var DIFF_INSERT = 1; +var DIFF_EQUAL = 0; + +/** @typedef {{0: number, 1: string}} */ +diff_match_patch.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.} 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.} Array of diff tuples. + * @private + */ +diff_match_patch.prototype.diff_compute_ = function(text1, text2, checklines, + deadline) { + var diffs; + + if (!text1) { + // Just add some text (speedup). + return [[DIFF_INSERT, text2]]; + } + + if (!text2) { + // Just delete some text (speedup). + return [[DIFF_DELETE, text1]]; + } + + var longtext = text1.length > text2.length ? text1 : text2; + var shorttext = text1.length > text2.length ? text2 : text1; + var i = longtext.indexOf(shorttext); + if (i != -1) { + // Shorter text is inside the longer text (speedup). + diffs = [[DIFF_INSERT, longtext.substring(0, i)], + [DIFF_EQUAL, shorttext], + [DIFF_INSERT, longtext.substring(i + shorttext.length)]]; + // Swap insertions for deletions if diff is reversed. + if (text1.length > text2.length) { + diffs[0][0] = diffs[2][0] = DIFF_DELETE; + } + return diffs; + } + + if (shorttext.length == 1) { + // Single character string. + // After the previous speedup, the character can't be an equality. + return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]]; + } + + // Check to see if the problem can be split in two. + var hm = this.diff_halfMatch_(text1, text2); + if (hm) { + // A half-match was found, sort out the return data. + var text1_a = hm[0]; + var text1_b = hm[1]; + var text2_a = hm[2]; + var text2_b = hm[3]; + var mid_common = hm[4]; + // Send both pairs off for separate processing. + var diffs_a = this.diff_main(text1_a, text2_a, checklines, deadline); + var diffs_b = this.diff_main(text1_b, text2_b, checklines, deadline); + // Merge the results. + return diffs_a.concat([[DIFF_EQUAL, mid_common]], diffs_b); + } + + if (checklines && text1.length > 100 && text2.length > 100) { + return this.diff_lineMode_(text1, text2, deadline); + } + + return this.diff_bisect_(text1, text2, deadline); +}; + + +/** + * Do a quick line-level diff on both strings, then rediff the parts for + * greater accuracy. + * This speedup can produce non-minimal diffs. + * @param {string} text1 Old string to be diffed. + * @param {string} text2 New string to be diffed. + * @param {number} deadline Time when the diff should be complete by. + * @return {!Array.} Array of diff tuples. + * @private + */ +diff_match_patch.prototype.diff_lineMode_ = function(text1, text2, deadline) { + // Scan the text on a line-by-line basis first. + var a = this.diff_linesToChars_(text1, text2); + text1 = a.chars1; + text2 = a.chars2; + var linearray = a.lineArray; + + var diffs = this.diff_main(text1, text2, false, deadline); + + // Convert the diff back to original text. + this.diff_charsToLines_(diffs, linearray); + // Eliminate freak matches (e.g. blank lines) + this.diff_cleanupSemantic(diffs); + + // Rediff any replacement blocks, this time character-by-character. + // Add a dummy entry at the end. + diffs.push([DIFF_EQUAL, '']); + var pointer = 0; + var count_delete = 0; + var count_insert = 0; + var text_delete = ''; + var text_insert = ''; + while (pointer < diffs.length) { + switch (diffs[pointer][0]) { + case DIFF_INSERT: + count_insert++; + text_insert += diffs[pointer][1]; + break; + case DIFF_DELETE: + count_delete++; + text_delete += diffs[pointer][1]; + break; + case DIFF_EQUAL: + // Upon reaching an equality, check for prior redundancies. + if (count_delete >= 1 && count_insert >= 1) { + // Delete the offending records and add the merged ones. + diffs.splice(pointer - count_delete - count_insert, + count_delete + count_insert); + pointer = pointer - count_delete - count_insert; + var a = this.diff_main(text_delete, text_insert, false, deadline); + for (var j = a.length - 1; j >= 0; j--) { + diffs.splice(pointer, 0, a[j]); + } + pointer = pointer + a.length; + } + count_insert = 0; + count_delete = 0; + text_delete = ''; + text_insert = ''; + break; + } + pointer++; + } + diffs.pop(); // Remove the dummy entry at the end. + + return diffs; +}; + + +/** + * Find the 'middle snake' of a diff, split the problem in two + * and return the recursively constructed diff. + * See Myers 1986 paper: An O(ND) Difference Algorithm and Its Variations. + * @param {string} text1 Old string to be diffed. + * @param {string} text2 New string to be diffed. + * @param {number} deadline Time at which to bail if not yet complete. + * @return {!Array.} 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.} Array of diff tuples. + * @private + */ +diff_match_patch.prototype.diff_bisectSplit_ = function(text1, text2, x, y, + deadline) { + var text1a = text1.substring(0, x); + var text2a = text2.substring(0, y); + var text1b = text1.substring(x); + var text2b = text2.substring(y); + + // Compute both diffs serially. + var diffs = this.diff_main(text1a, text2a, false, deadline); + var diffsb = this.diff_main(text1b, text2b, false, deadline); + + return diffs.concat(diffsb); +}; + + +/** + * Split two texts into an array of strings. Reduce the texts to a string of + * hashes where each Unicode character represents one line. + * @param {string} text1 First string. + * @param {string} text2 Second string. + * @return {{chars1: string, chars2: string, lineArray: !Array.}} + * An object containing the encoded text1, the encoded text2 and + * the array of unique strings. + * The zeroth element of the array of unique strings is intentionally blank. + * @private + */ +diff_match_patch.prototype.diff_linesToChars_ = function(text1, text2) { + var lineArray = []; // e.g. lineArray[4] == 'Hello\n' + var lineHash = {}; // e.g. lineHash['Hello\n'] == 4 + + // '\x00' is a valid character, but various debuggers don't like it. + // So we'll insert a junk entry to avoid generating a null character. + lineArray[0] = ''; + + /** + * Split a text into an array of strings. Reduce the texts to a string of + * hashes where each Unicode character represents one line. + * Modifies linearray and linehash through being a closure. + * @param {string} text String to encode. + * @return {string} Encoded string. + * @private + */ + function diff_linesToCharsMunge_(text) { + var chars = ''; + // Walk the text, pulling out a substring for each line. + // text.split('\n') would would temporarily double our memory footprint. + // Modifying text would create many large strings to garbage collect. + var lineStart = 0; + var lineEnd = -1; + // Keeping our own length variable is faster than looking it up. + var lineArrayLength = lineArray.length; + while (lineEnd < text.length - 1) { + lineEnd = text.indexOf('\n', lineStart); + if (lineEnd == -1) { + lineEnd = text.length - 1; + } + var line = text.substring(lineStart, lineEnd + 1); + lineStart = lineEnd + 1; + + if (lineHash.hasOwnProperty ? lineHash.hasOwnProperty(line) : + (lineHash[line] !== undefined)) { + chars += String.fromCharCode(lineHash[line]); + } else { + chars += String.fromCharCode(lineArrayLength); + lineHash[line] = lineArrayLength; + lineArray[lineArrayLength++] = line; + } + } + return chars; + } + + var chars1 = diff_linesToCharsMunge_(text1); + var chars2 = diff_linesToCharsMunge_(text2); + return {chars1: chars1, chars2: chars2, lineArray: lineArray}; +}; + + +/** + * Rehydrate the text in a diff from a string of line hashes to real lines of + * text. + * @param {!Array.} diffs Array of diff tuples. + * @param {!Array.} 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.} 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.} 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.} diffs Array of diff tuples. + */ +diff_match_patch.prototype.diff_cleanupSemantic = function(diffs) { + var changes = false; + var equalities = []; // Stack of indices where equalities are found. + var equalitiesLength = 0; // Keeping our own length var is faster in JS. + /** @type {?string} */ + var lastequality = null; + // Always equal to diffs[equalities[equalitiesLength - 1]][1] + var pointer = 0; // Index of current position. + // Number of characters that changed prior to the equality. + var length_insertions1 = 0; + var length_deletions1 = 0; + // Number of characters that changed after the equality. + var length_insertions2 = 0; + var length_deletions2 = 0; + while (pointer < diffs.length) { + if (diffs[pointer][0] == DIFF_EQUAL) { // Equality found. + equalities[equalitiesLength++] = pointer; + length_insertions1 = length_insertions2; + length_deletions1 = length_deletions2; + length_insertions2 = 0; + length_deletions2 = 0; + lastequality = diffs[pointer][1]; + } else { // An insertion or deletion. + if (diffs[pointer][0] == DIFF_INSERT) { + length_insertions2 += diffs[pointer][1].length; + } else { + length_deletions2 += diffs[pointer][1].length; + } + // Eliminate an equality that is smaller or equal to the edits on both + // sides of it. + if (lastequality && (lastequality.length <= + Math.max(length_insertions1, length_deletions1)) && + (lastequality.length <= Math.max(length_insertions2, + length_deletions2))) { + // Duplicate record. + diffs.splice(equalities[equalitiesLength - 1], 0, + [DIFF_DELETE, lastequality]); + // Change second copy to insert. + diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT; + // Throw away the equality we just deleted. + equalitiesLength--; + // Throw away the previous equality (it needs to be reevaluated). + equalitiesLength--; + pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1; + length_insertions1 = 0; // Reset the counters. + length_deletions1 = 0; + length_insertions2 = 0; + length_deletions2 = 0; + lastequality = null; + changes = true; + } + } + pointer++; + } + + // Normalize the diff. + if (changes) { + this.diff_cleanupMerge(diffs); + } + this.diff_cleanupSemanticLossless(diffs); + + // Find any overlaps between deletions and insertions. + // e.g: abcxxxxxxdef + // -> abcxxxdef + // e.g: xxxabcdefxxx + // -> defxxxabc + // Only extract an overlap if it is as big as the edit ahead or behind it. + pointer = 1; + while (pointer < diffs.length) { + if (diffs[pointer - 1][0] == DIFF_DELETE && + diffs[pointer][0] == DIFF_INSERT) { + var deletion = diffs[pointer - 1][1]; + var insertion = diffs[pointer][1]; + var overlap_length1 = this.diff_commonOverlap_(deletion, insertion); + var overlap_length2 = this.diff_commonOverlap_(insertion, deletion); + if (overlap_length1 >= overlap_length2) { + if (overlap_length1 >= deletion.length / 2 || + overlap_length1 >= insertion.length / 2) { + // Overlap found. Insert an equality and trim the surrounding edits. + diffs.splice(pointer, 0, + [DIFF_EQUAL, insertion.substring(0, overlap_length1)]); + diffs[pointer - 1][1] = + deletion.substring(0, deletion.length - overlap_length1); + diffs[pointer + 1][1] = insertion.substring(overlap_length1); + pointer++; + } + } else { + if (overlap_length2 >= deletion.length / 2 || + overlap_length2 >= insertion.length / 2) { + // Reverse overlap found. + // Insert an equality and swap and trim the surrounding edits. + diffs.splice(pointer, 0, + [DIFF_EQUAL, deletion.substring(0, overlap_length2)]); + diffs[pointer - 1][0] = DIFF_INSERT; + diffs[pointer - 1][1] = + insertion.substring(0, insertion.length - overlap_length2); + diffs[pointer + 1][0] = DIFF_DELETE; + diffs[pointer + 1][1] = + deletion.substring(overlap_length2); + pointer++; + } + } + pointer++; + } + pointer++; + } +}; + + +/** + * Look for single edits surrounded on both sides by equalities + * which can be shifted sideways to align the edit to a word boundary. + * e.g: The cat came. -> The cat came. + * @param {!Array.} diffs Array of diff tuples. + */ +diff_match_patch.prototype.diff_cleanupSemanticLossless = function(diffs) { + /** + * Given two strings, compute a score representing whether the internal + * boundary falls on logical boundaries. + * Scores range from 6 (best) to 0 (worst). + * Closure, but does not reference any external variables. + * @param {string} one First string. + * @param {string} two Second string. + * @return {number} The score. + * @private + */ + function diff_cleanupSemanticScore_(one, two) { + if (!one || !two) { + // Edges are the best. + return 6; + } + + // Each port of this function behaves slightly differently due to + // subtle differences in each language's definition of things like + // 'whitespace'. Since this function's purpose is largely cosmetic, + // the choice has been made to use each language's native features + // rather than force total conformity. + var char1 = one.charAt(one.length - 1); + var char2 = two.charAt(0); + var nonAlphaNumeric1 = char1.match(diff_match_patch.nonAlphaNumericRegex_); + var nonAlphaNumeric2 = char2.match(diff_match_patch.nonAlphaNumericRegex_); + var whitespace1 = nonAlphaNumeric1 && + char1.match(diff_match_patch.whitespaceRegex_); + var whitespace2 = nonAlphaNumeric2 && + char2.match(diff_match_patch.whitespaceRegex_); + var lineBreak1 = whitespace1 && + char1.match(diff_match_patch.linebreakRegex_); + var lineBreak2 = whitespace2 && + char2.match(diff_match_patch.linebreakRegex_); + var blankLine1 = lineBreak1 && + one.match(diff_match_patch.blanklineEndRegex_); + var blankLine2 = lineBreak2 && + two.match(diff_match_patch.blanklineStartRegex_); + + if (blankLine1 || blankLine2) { + // Five points for blank lines. + return 5; + } else if (lineBreak1 || lineBreak2) { + // Four points for line breaks. + return 4; + } else if (nonAlphaNumeric1 && !whitespace1 && whitespace2) { + // Three points for end of sentences. + return 3; + } else if (whitespace1 || whitespace2) { + // Two points for whitespace. + return 2; + } else if (nonAlphaNumeric1 || nonAlphaNumeric2) { + // One point for non-alphanumeric. + return 1; + } + return 0; + } + + var pointer = 1; + // Intentionally ignore the first and last element (don't need checking). + while (pointer < diffs.length - 1) { + if (diffs[pointer - 1][0] == DIFF_EQUAL && + diffs[pointer + 1][0] == DIFF_EQUAL) { + // This is a single edit surrounded by equalities. + var equality1 = diffs[pointer - 1][1]; + var edit = diffs[pointer][1]; + var equality2 = diffs[pointer + 1][1]; + + // First, shift the edit as far left as possible. + var commonOffset = this.diff_commonSuffix(equality1, edit); + if (commonOffset) { + var commonString = edit.substring(edit.length - commonOffset); + equality1 = equality1.substring(0, equality1.length - commonOffset); + edit = commonString + edit.substring(0, edit.length - commonOffset); + equality2 = commonString + equality2; + } + + // Second, step character by character right, looking for the best fit. + var bestEquality1 = equality1; + var bestEdit = edit; + var bestEquality2 = equality2; + var bestScore = diff_cleanupSemanticScore_(equality1, edit) + + diff_cleanupSemanticScore_(edit, equality2); + while (edit.charAt(0) === equality2.charAt(0)) { + equality1 += edit.charAt(0); + edit = edit.substring(1) + equality2.charAt(0); + equality2 = equality2.substring(1); + var score = diff_cleanupSemanticScore_(equality1, edit) + + diff_cleanupSemanticScore_(edit, equality2); + // The >= encourages trailing rather than leading whitespace on edits. + if (score >= bestScore) { + bestScore = score; + bestEquality1 = equality1; + bestEdit = edit; + bestEquality2 = equality2; + } + } + + if (diffs[pointer - 1][1] != bestEquality1) { + // We have an improvement, save it back to the diff. + if (bestEquality1) { + diffs[pointer - 1][1] = bestEquality1; + } else { + diffs.splice(pointer - 1, 1); + pointer--; + } + diffs[pointer][1] = bestEdit; + if (bestEquality2) { + diffs[pointer + 1][1] = bestEquality2; + } else { + diffs.splice(pointer + 1, 1); + pointer--; + } + } + } + pointer++; + } +}; + +// Define some regex patterns for matching boundaries. +diff_match_patch.nonAlphaNumericRegex_ = /[^a-zA-Z0-9]/; +diff_match_patch.whitespaceRegex_ = /\s/; +diff_match_patch.linebreakRegex_ = /[\r\n]/; +diff_match_patch.blanklineEndRegex_ = /\n\r?\n$/; +diff_match_patch.blanklineStartRegex_ = /^\r?\n\r?\n/; + +/** + * Reduce the number of edits by eliminating operationally trivial equalities. + * @param {!Array.} diffs Array of diff tuples. + */ +diff_match_patch.prototype.diff_cleanupEfficiency = function(diffs) { + var changes = false; + var equalities = []; // Stack of indices where equalities are found. + var equalitiesLength = 0; // Keeping our own length var is faster in JS. + /** @type {?string} */ + var lastequality = null; + // Always equal to diffs[equalities[equalitiesLength - 1]][1] + var pointer = 0; // Index of current position. + // Is there an insertion operation before the last equality. + var pre_ins = false; + // Is there a deletion operation before the last equality. + var pre_del = false; + // Is there an insertion operation after the last equality. + var post_ins = false; + // Is there a deletion operation after the last equality. + var post_del = false; + while (pointer < diffs.length) { + if (diffs[pointer][0] == DIFF_EQUAL) { // Equality found. + if (diffs[pointer][1].length < this.Diff_EditCost && + (post_ins || post_del)) { + // Candidate found. + equalities[equalitiesLength++] = pointer; + pre_ins = post_ins; + pre_del = post_del; + lastequality = diffs[pointer][1]; + } else { + // Not a candidate, and can never become one. + equalitiesLength = 0; + lastequality = null; + } + post_ins = post_del = false; + } else { // An insertion or deletion. + if (diffs[pointer][0] == DIFF_DELETE) { + post_del = true; + } else { + post_ins = true; + } + /* + * Five types to be split: + * ABXYCD + * AXCD + * ABXC + * AXCD + * ABXC + */ + if (lastequality && ((pre_ins && pre_del && post_ins && post_del) || + ((lastequality.length < this.Diff_EditCost / 2) && + (pre_ins + pre_del + post_ins + post_del) == 3))) { + // Duplicate record. + diffs.splice(equalities[equalitiesLength - 1], 0, + [DIFF_DELETE, lastequality]); + // Change second copy to insert. + diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT; + equalitiesLength--; // Throw away the equality we just deleted; + lastequality = null; + if (pre_ins && pre_del) { + // No changes made which could affect previous entry, keep going. + post_ins = post_del = true; + equalitiesLength = 0; + } else { + equalitiesLength--; // Throw away the previous equality. + pointer = equalitiesLength > 0 ? + equalities[equalitiesLength - 1] : -1; + post_ins = post_del = false; + } + changes = true; + } + } + pointer++; + } + + if (changes) { + this.diff_cleanupMerge(diffs); + } +}; + + +/** + * Reorder and merge like edit sections. Merge equalities. + * Any edit section can move as long as it doesn't cross an equality. + * @param {!Array.} diffs Array of diff tuples. + */ +diff_match_patch.prototype.diff_cleanupMerge = function(diffs) { + diffs.push([DIFF_EQUAL, '']); // Add a dummy entry at the end. + var pointer = 0; + var count_delete = 0; + var count_insert = 0; + var text_delete = ''; + var text_insert = ''; + var commonlength; + while (pointer < diffs.length) { + switch (diffs[pointer][0]) { + case DIFF_INSERT: + count_insert++; + text_insert += diffs[pointer][1]; + pointer++; + break; + case DIFF_DELETE: + count_delete++; + text_delete += diffs[pointer][1]; + pointer++; + break; + case DIFF_EQUAL: + // Upon reaching an equality, check for prior redundancies. + if (count_delete + count_insert > 1) { + if (count_delete !== 0 && count_insert !== 0) { + // Factor out any common prefixies. + commonlength = this.diff_commonPrefix(text_insert, text_delete); + if (commonlength !== 0) { + if ((pointer - count_delete - count_insert) > 0 && + diffs[pointer - count_delete - count_insert - 1][0] == + DIFF_EQUAL) { + diffs[pointer - count_delete - count_insert - 1][1] += + text_insert.substring(0, commonlength); + } else { + diffs.splice(0, 0, [DIFF_EQUAL, + text_insert.substring(0, commonlength)]); + pointer++; + } + text_insert = text_insert.substring(commonlength); + text_delete = text_delete.substring(commonlength); + } + // Factor out any common suffixies. + commonlength = this.diff_commonSuffix(text_insert, text_delete); + if (commonlength !== 0) { + diffs[pointer][1] = text_insert.substring(text_insert.length - + commonlength) + diffs[pointer][1]; + text_insert = text_insert.substring(0, text_insert.length - + commonlength); + text_delete = text_delete.substring(0, text_delete.length - + commonlength); + } + } + // Delete the offending records and add the merged ones. + if (count_delete === 0) { + diffs.splice(pointer - count_insert, + count_delete + count_insert, [DIFF_INSERT, text_insert]); + } else if (count_insert === 0) { + diffs.splice(pointer - count_delete, + count_delete + count_insert, [DIFF_DELETE, text_delete]); + } else { + diffs.splice(pointer - count_delete - count_insert, + count_delete + count_insert, [DIFF_DELETE, text_delete], + [DIFF_INSERT, text_insert]); + } + pointer = pointer - count_delete - count_insert + + (count_delete ? 1 : 0) + (count_insert ? 1 : 0) + 1; + } else if (pointer !== 0 && diffs[pointer - 1][0] == DIFF_EQUAL) { + // Merge this equality with the previous one. + diffs[pointer - 1][1] += diffs[pointer][1]; + diffs.splice(pointer, 1); + } else { + pointer++; + } + count_insert = 0; + count_delete = 0; + text_delete = ''; + text_insert = ''; + break; + } + } + if (diffs[diffs.length - 1][1] === '') { + diffs.pop(); // Remove the dummy entry at the end. + } + + // Second pass: look for single edits surrounded on both sides by equalities + // which can be shifted sideways to eliminate an equality. + // e.g: ABAC -> ABAC + 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.} 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.} diffs Array of diff tuples. + * @return {string} HTML representation. + */ +diff_match_patch.prototype.diff_prettyHtml = function(diffs) { + var html = []; + var pattern_amp = /&/g; + var pattern_lt = //g; + var pattern_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, '&').replace(pattern_lt, '<') + .replace(pattern_gt, '>').replace(pattern_para, '¶
'); + switch (op) { + case DIFF_INSERT: + html[x] = '' + text + ''; + break; + case DIFF_DELETE: + html[x] = '' + text + ''; + break; + case DIFF_EQUAL: + html[x] = '' + text + ''; + break; + } + } + return html.join(''); +}; + + +/** + * Compute and return the source text (all equalities and deletions). + * @param {!Array.} 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.} 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.} 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.} 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.} 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.} a text1 (methods 1,3,4) or + * Array of diff tuples for text1 to text2 (method 2). + * @param {string|!Array.} opt_b text2 (methods 1,4) or + * Array of diff tuples for text1 to text2 (method 3) or undefined (method 2). + * @param {string|!Array.} opt_c Array of diff tuples + * for text1 to text2 (method 4) or undefined (methods 1,2,3). + * @return {!Array.} 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.} */(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.} */(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.} */(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.} patches Array of Patch objects. + * @return {!Array.} 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.} patches Array of Patch objects. + * @param {string} text Old text. + * @return {!Array.>} 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.} 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.} patches Array of Patch objects. + */ +diff_match_patch.prototype.patch_splitMax = function(patches) { + var patch_size = this.Match_MaxBits; + for (var x = 0; x < patches.length; x++) { + if (patches[x].length1 <= patch_size) { + continue; + } + var bigpatch = patches[x]; + // Remove the big old patch. + patches.splice(x--, 1); + var start1 = bigpatch.start1; + var start2 = bigpatch.start2; + var precontext = ''; + while (bigpatch.diffs.length !== 0) { + // Create one of several smaller patches. + var patch = new diff_match_patch.patch_obj(); + var empty = true; + patch.start1 = start1 - precontext.length; + patch.start2 = start2 - precontext.length; + if (precontext !== '') { + patch.length1 = patch.length2 = precontext.length; + patch.diffs.push([DIFF_EQUAL, precontext]); + } + while (bigpatch.diffs.length !== 0 && + patch.length1 < patch_size - this.Patch_Margin) { + var diff_type = bigpatch.diffs[0][0]; + var diff_text = bigpatch.diffs[0][1]; + if (diff_type === DIFF_INSERT) { + // Insertions are harmless. + patch.length2 += diff_text.length; + start2 += diff_text.length; + patch.diffs.push(bigpatch.diffs.shift()); + empty = false; + } else if (diff_type === DIFF_DELETE && patch.diffs.length == 1 && + patch.diffs[0][0] == DIFF_EQUAL && + diff_text.length > 2 * patch_size) { + // This is a large deletion. Let it pass in one chunk. + patch.length1 += diff_text.length; + start1 += diff_text.length; + empty = false; + patch.diffs.push([diff_type, diff_text]); + bigpatch.diffs.shift(); + } else { + // Deletion or equality. Only take as much as we can stomach. + diff_text = diff_text.substring(0, + patch_size - patch.length1 - this.Patch_Margin); + patch.length1 += diff_text.length; + start1 += diff_text.length; + if (diff_type === DIFF_EQUAL) { + patch.length2 += diff_text.length; + start2 += diff_text.length; + } else { + empty = false; + } + patch.diffs.push([diff_type, diff_text]); + if (diff_text == bigpatch.diffs[0][1]) { + bigpatch.diffs.shift(); + } else { + bigpatch.diffs[0][1] = + bigpatch.diffs[0][1].substring(diff_text.length); + } + } + } + // Compute the head context for the next patch. + precontext = this.diff_text2(patch.diffs); + precontext = + precontext.substring(precontext.length - this.Patch_Margin); + // Append the end context for this patch. + var postcontext = this.diff_text1(bigpatch.diffs) + .substring(0, this.Patch_Margin); + if (postcontext !== '') { + patch.length1 += postcontext.length; + patch.length2 += postcontext.length; + if (patch.diffs.length !== 0 && + patch.diffs[patch.diffs.length - 1][0] === DIFF_EQUAL) { + patch.diffs[patch.diffs.length - 1][1] += postcontext; + } else { + patch.diffs.push([DIFF_EQUAL, postcontext]); + } + } + if (!empty) { + patches.splice(++x, 0, patch); + } + } + } +}; + + +/** + * Take a list of patches and return a textual representation. + * @param {!Array.} 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.} 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.} */ + 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'. +// Users of node.js should 'require' the uncompressed version since Google's +// JS compiler may break the following exports for non-browser environments. +this['diff_match_patch'] = diff_match_patch; +this['DIFF_DELETE'] = DIFF_DELETE; +this['DIFF_INSERT'] = DIFF_INSERT; +this['DIFF_EQUAL'] = DIFF_EQUAL; \ No newline at end of file diff --git a/js/pagedown-extra.js b/js/pagedown-extra.js new file mode 100644 index 0000000..4222128 --- /dev/null +++ b/js/pagedown-extra.js @@ -0,0 +1,873 @@ +(function () { + // A quick way to make sure we're only keeping span-level tags when we need to. + // This isn't supposed to be foolproof. It's just a quick way to make sure we + // keep all span-level tags returned by a pagedown converter. It should allow + // all span-level tags through, with or without attributes. + var inlineTags = new RegExp(['^(<\\/?(a|abbr|acronym|applet|area|b|basefont|', + 'bdo|big|button|cite|code|del|dfn|em|figcaption|', + 'font|i|iframe|img|input|ins|kbd|label|map|', + 'mark|meter|object|param|progress|q|ruby|rp|rt|s|', + 'samp|script|select|small|span|strike|strong|', + 'sub|sup|textarea|time|tt|u|var|wbr)[^>]*>|', + '<(br)\\s?\\/?>)$'].join(''), 'i'); + + /****************************************************************** + * Utility Functions * + *****************************************************************/ + + // patch for ie7 + if (!Array.indexOf) { + Array.prototype.indexOf = function(obj) { + for (var i = 0; i < this.length; i++) { + if (this[i] == obj) { + return i; + } + } + return -1; + }; + } + + function trim(str) { + return str.replace(/^\s+|\s+$/g, ''); + } + + function rtrim(str) { + return str.replace(/\s+$/g, ''); + } + + // Remove one level of indentation from text. Indent is 4 spaces. + function outdent(text) { + return text.replace(new RegExp('^(\\t|[ ]{1,4})', 'gm'), ''); + } + + function contains(str, substr) { + return str.indexOf(substr) != -1; + } + + // Sanitize html, removing tags that aren't in the whitelist + function sanitizeHtml(html, whitelist) { + return html.replace(/<[^>]*>?/gi, function(tag) { + return tag.match(whitelist) ? tag : ''; + }); + } + + // Merge two arrays, keeping only unique elements. + function union(x, y) { + var obj = {}; + for (var i = 0; i < x.length; i++) + obj[x[i]] = x[i]; + for (i = 0; i < y.length; i++) + obj[y[i]] = y[i]; + var res = []; + for (var k in obj) { + if (obj.hasOwnProperty(k)) + res.push(obj[k]); + } + return res; + } + + // JS regexes don't support \A or \Z, so we add sentinels, as Pagedown + // does. In this case, we add the ascii codes for start of text (STX) and + // end of text (ETX), an idea borrowed from: + // https://github.com/tanakahisateru/js-markdown-extra + function addAnchors(text) { + if(text.charAt(0) != '\x02') + text = '\x02' + text; + if(text.charAt(text.length - 1) != '\x03') + text = text + '\x03'; + return text; + } + + // Remove STX and ETX sentinels. + function removeAnchors(text) { + if(text.charAt(0) == '\x02') + text = text.substr(1); + if(text.charAt(text.length - 1) == '\x03') + text = text.substr(0, text.length - 1); + return text; + } + + // Convert markdown within an element, retaining only span-level tags + function convertSpans(text, extra) { + return sanitizeHtml(convertAll(text, extra), inlineTags); + } + + // Convert internal markdown using the stock pagedown converter + function convertAll(text, extra) { + var result = extra.blockGamutHookCallback(text); + // We need to perform these operations since we skip the steps in the converter + result = unescapeSpecialChars(result); + result = result.replace(/~D/g, "$$").replace(/~T/g, "~"); + result = extra.previousPostConversion(result); + return result; + } + + // Convert escaped special characters + function processEscapesStep1(text) { + // Markdown extra adds two escapable characters, `:` and `|` + return text.replace(/\\\|/g, '~I').replace(/\\:/g, '~i'); + } + function processEscapesStep2(text) { + return text.replace(/~I/g, '|').replace(/~i/g, ':'); + } + + // Duplicated from PageDown converter + function unescapeSpecialChars(text) { + // Swap back in all the special characters we've hidden. + text = text.replace(/~E(\d+)E/g, function(wholeMatch, m1) { + var charCodeToReplace = parseInt(m1); + return String.fromCharCode(charCodeToReplace); + }); + return text; + } + + function slugify(text) { + return text.toLowerCase() + .replace(/\s+/g, '-') // Replace spaces with - + .replace(/[^\w\-]+/g, '') // Remove all non-word chars + .replace(/\-\-+/g, '-') // Replace multiple - with single - + .replace(/^-+/, '') // Trim - from start of text + .replace(/-+$/, ''); // Trim - from end of text + } + + /***************************************************************************** + * Markdown.Extra * + ****************************************************************************/ + + Markdown.Extra = function() { + // For converting internal markdown (in tables for instance). + // This is necessary since these methods are meant to be called as + // preConversion hooks, and the Markdown converter passed to init() + // won't convert any markdown contained in the html tags we return. + this.converter = null; + + // Stores html blocks we generate in hooks so that + // they're not destroyed if the user is using a sanitizing converter + this.hashBlocks = []; + + // Stores footnotes + this.footnotes = {}; + this.usedFootnotes = []; + + // Special attribute blocks for fenced code blocks and headers enabled. + this.attributeBlocks = false; + + // Fenced code block options + this.googleCodePrettify = false; + this.highlightJs = false; + + // Table options + this.tableClass = ''; + + this.tabWidth = 4; + }; + + Markdown.Extra.init = function(converter, options) { + // Each call to init creates a new instance of Markdown.Extra so it's + // safe to have multiple converters, with different options, on a single page + var extra = new Markdown.Extra(); + var postNormalizationTransformations = []; + var preBlockGamutTransformations = []; + var postSpanGamutTransformations = []; + var postConversionTransformations = ["unHashExtraBlocks"]; + + options = options || {}; + options.extensions = options.extensions || ["all"]; + if (contains(options.extensions, "all")) { + options.extensions = ["tables", "fenced_code_gfm", "def_list", "attr_list", "footnotes", "smartypants", "strikethrough", "newlines"]; + } + preBlockGamutTransformations.push("wrapHeaders"); + if (contains(options.extensions, "attr_list")) { + postNormalizationTransformations.push("hashFcbAttributeBlocks"); + preBlockGamutTransformations.push("hashHeaderAttributeBlocks"); + postConversionTransformations.push("applyAttributeBlocks"); + extra.attributeBlocks = true; + } + if (contains(options.extensions, "fenced_code_gfm")) { + // This step will convert fcb inside list items and blockquotes + preBlockGamutTransformations.push("fencedCodeBlocks"); + // This extra step is to prevent html blocks hashing and link definition/footnotes stripping inside fcb + postNormalizationTransformations.push("fencedCodeBlocks"); + } + if (contains(options.extensions, "tables")) { + preBlockGamutTransformations.push("tables"); + } + if (contains(options.extensions, "def_list")) { + preBlockGamutTransformations.push("definitionLists"); + } + if (contains(options.extensions, "footnotes")) { + postNormalizationTransformations.push("stripFootnoteDefinitions"); + preBlockGamutTransformations.push("doFootnotes"); + postConversionTransformations.push("printFootnotes"); + } + if (contains(options.extensions, "smartypants")) { + postConversionTransformations.push("runSmartyPants"); + } + if (contains(options.extensions, "strikethrough")) { + postSpanGamutTransformations.push("strikethrough"); + } + if (contains(options.extensions, "newlines")) { + postSpanGamutTransformations.push("newlines"); + } + + converter.hooks.chain("postNormalization", function(text) { + return extra.doTransform(postNormalizationTransformations, text) + '\n'; + }); + + converter.hooks.chain("preBlockGamut", function(text, blockGamutHookCallback) { + // Keep a reference to the block gamut callback to run recursively + extra.blockGamutHookCallback = blockGamutHookCallback; + text = processEscapesStep1(text); + text = extra.doTransform(preBlockGamutTransformations, text) + '\n'; + text = processEscapesStep2(text); + return text; + }); + + converter.hooks.chain("postSpanGamut", function(text) { + return extra.doTransform(postSpanGamutTransformations, text); + }); + + // Keep a reference to the hook chain running before doPostConversion to apply on hashed extra blocks + extra.previousPostConversion = converter.hooks.postConversion; + converter.hooks.chain("postConversion", function(text) { + text = extra.doTransform(postConversionTransformations, text); + // Clear state vars that may use unnecessary memory + extra.hashBlocks = []; + extra.footnotes = {}; + extra.usedFootnotes = []; + return text; + }); + + if ("highlighter" in options) { + extra.googleCodePrettify = options.highlighter === 'prettify'; + extra.highlightJs = options.highlighter === 'highlight'; + } + + if ("table_class" in options) { + extra.tableClass = options.table_class; + } + + extra.converter = converter; + + // Caller usually won't need this, but it's handy for testing. + return extra; + }; + + // Do transformations + Markdown.Extra.prototype.doTransform = function(transformations, text) { + for(var i = 0; i < transformations.length; i++) + text = this[transformations[i]](text); + return text; + }; + + // Return a placeholder containing a key, which is the block's index in the + // hashBlocks array. We wrap our output in a

tag here so Pagedown won't. + Markdown.Extra.prototype.hashExtraBlock = function(block) { + return '\n

~X' + (this.hashBlocks.push(block) - 1) + 'X

\n'; + }; + Markdown.Extra.prototype.hashExtraInline = function(block) { + return '~X' + (this.hashBlocks.push(block) - 1) + 'X'; + }; + + // Replace placeholder blocks in `text` with their corresponding + // html blocks in the hashBlocks array. + Markdown.Extra.prototype.unHashExtraBlocks = function(text) { + var self = this; + function recursiveUnHash() { + var hasHash = false; + text = text.replace(/(?:

)?~X(\d+)X(?:<\/p>)?/g, function(wholeMatch, m1) { + hasHash = true; + var key = parseInt(m1, 10); + return self.hashBlocks[key]; + }); + if(hasHash === true) { + recursiveUnHash(); + } + } + recursiveUnHash(); + return text; + }; + + // Wrap headers to make sure they won't be in def lists + Markdown.Extra.prototype.wrapHeaders = function(text) { + function wrap(text) { + return '\n' + text + '\n'; + } + text = text.replace(/^.+[ \t]*\n=+[ \t]*\n+/gm, wrap); + text = text.replace(/^.+[ \t]*\n-+[ \t]*\n+/gm, wrap); + text = text.replace(/^\#{1,6}[ \t]*.+?[ \t]*\#*\n+/gm, wrap); + return text; + }; + + + /****************************************************************** + * Attribute Blocks * + *****************************************************************/ + + // TODO: use sentinels. Should we just add/remove them in doConversion? + // TODO: better matches for id / class attributes + var attrBlock = "\\{[ \\t]*((?:[#.][-_:a-zA-Z0-9]+[ \\t]*)+)\\}"; + var hdrAttributesA = new RegExp("^(#{1,6}.*#{0,6})[ \\t]+" + attrBlock + "[ \\t]*(?:\\n|0x03)", "gm"); + var hdrAttributesB = new RegExp("^(.*)[ \\t]+" + attrBlock + "[ \\t]*\\n" + + "(?=[\\-|=]+\\s*(?:\\n|0x03))", "gm"); // underline lookahead + var fcbAttributes = new RegExp("^(```[ \\t]*[^{\\s]*)[ \\t]+" + attrBlock + "[ \\t]*\\n" + + "(?=([\\s\\S]*?)\\n```[ \\t]*(\\n|0x03))", "gm"); + + // Extract headers attribute blocks, move them above the element they will be + // applied to, and hash them for later. + Markdown.Extra.prototype.hashHeaderAttributeBlocks = function(text) { + + var self = this; + function attributeCallback(wholeMatch, pre, attr) { + return '

~XX' + (self.hashBlocks.push(attr) - 1) + 'XX

\n' + pre + "\n"; + } + + text = text.replace(hdrAttributesA, attributeCallback); // ## headers + text = text.replace(hdrAttributesB, attributeCallback); // underline headers + return text; + }; + + // Extract FCB attribute blocks, move them above the element they will be + // applied to, and hash them for later. + Markdown.Extra.prototype.hashFcbAttributeBlocks = function(text) { + // TODO: use sentinels. Should we just add/remove them in doConversion? + // TODO: better matches for id / class attributes + + var self = this; + function attributeCallback(wholeMatch, pre, attr) { + return '

~XX' + (self.hashBlocks.push(attr) - 1) + 'XX

\n' + pre + "\n"; + } + + return text.replace(fcbAttributes, attributeCallback); + }; + + Markdown.Extra.prototype.applyAttributeBlocks = function(text) { + var self = this; + var blockRe = new RegExp('

~XX(\\d+)XX

[\\s]*' + + '(?:<(h[1-6]|pre)(?: +class="(\\S+)")?(>[\\s\\S]*?))', "gm"); + text = text.replace(blockRe, function(wholeMatch, k, tag, cls, rest) { + if (!tag) // no following header or fenced code block. + return ''; + + // get attributes list from hash + var key = parseInt(k, 10); + var attributes = self.hashBlocks[key]; + + // get id + var id = attributes.match(/#[^\s#.]+/g) || []; + var idStr = id[0] ? ' id="' + id[0].substr(1, id[0].length - 1) + '"' : ''; + + // get classes and merge with existing classes + var classes = attributes.match(/\.[^\s#.]+/g) || []; + for (var i = 0; i < classes.length; i++) // Remove leading dot + classes[i] = classes[i].substr(1, classes[i].length - 1); + + var classStr = ''; + if (cls) + classes = union(classes, [cls]); + + if (classes.length > 0) + classStr = ' class="' + classes.join(' ') + '"'; + + return "<" + tag + idStr + classStr + rest; + }); + + return text; + }; + + /****************************************************************** + * Tables * + *****************************************************************/ + + // Find and convert Markdown Extra tables into html. + Markdown.Extra.prototype.tables = function(text) { + var self = this; + + var leadingPipe = new RegExp( + ['^' , + '[ ]{0,3}' , // Allowed whitespace + '[|]' , // Initial pipe + '(.+)\\n' , // $1: Header Row + + '[ ]{0,3}' , // Allowed whitespace + '[|]([ ]*[-:]+[-| :]*)\\n' , // $2: Separator + + '(' , // $3: Table Body + '(?:[ ]*[|].*\\n?)*' , // Table rows + ')', + '(?:\\n|$)' // Stop at final newline + ].join(''), + 'gm' + ); + + var noLeadingPipe = new RegExp( + ['^' , + '[ ]{0,3}' , // Allowed whitespace + '(\\S.*[|].*)\\n' , // $1: Header Row + + '[ ]{0,3}' , // Allowed whitespace + '([-:]+[ ]*[|][-| :]*)\\n' , // $2: Separator + + '(' , // $3: Table Body + '(?:.*[|].*\\n?)*' , // Table rows + ')' , + '(?:\\n|$)' // Stop at final newline + ].join(''), + 'gm' + ); + + text = text.replace(leadingPipe, doTable); + text = text.replace(noLeadingPipe, doTable); + + // $1 = header, $2 = separator, $3 = body + function doTable(match, header, separator, body, offset, string) { + // remove any leading pipes and whitespace + header = header.replace(/^ *[|]/m, ''); + separator = separator.replace(/^ *[|]/m, ''); + body = body.replace(/^ *[|]/gm, ''); + + // remove trailing pipes and whitespace + header = header.replace(/[|] *$/m, ''); + separator = separator.replace(/[|] *$/m, ''); + body = body.replace(/[|] *$/gm, ''); + + // determine column alignments + alignspecs = separator.split(/ *[|] */); + align = []; + for (var i = 0; i < alignspecs.length; i++) { + var spec = alignspecs[i]; + if (spec.match(/^ *-+: *$/m)) + align[i] = ' align="right"'; + else if (spec.match(/^ *:-+: *$/m)) + align[i] = ' align="center"'; + else if (spec.match(/^ *:-+ *$/m)) + align[i] = ' align="left"'; + else align[i] = ''; + } + + // TODO: parse spans in header and rows before splitting, so that pipes + // inside of tags are not interpreted as separators + var headers = header.split(/ *[|] */); + var colCount = headers.length; + + // build html + var cls = self.tableClass ? ' class="' + self.tableClass + '"' : ''; + var html = ['\n', '\n', '\n'].join(''); + + // build column headers. + for (i = 0; i < colCount; i++) { + var headerHtml = convertSpans(trim(headers[i]), self); + html += [" ", headerHtml, "\n"].join(''); + } + html += "\n\n"; + + // build rows + var rows = body.split('\n'); + for (i = 0; i < rows.length; i++) { + if (rows[i].match(/^\s*$/)) // can apply to final row + continue; + + // ensure number of rowCells matches colCount + var rowCells = rows[i].split(/ *[|] */); + var lenDiff = colCount - rowCells.length; + for (var j = 0; j < lenDiff; j++) + rowCells.push(''); + + html += "\n"; + for (j = 0; j < colCount; j++) { + var colHtml = convertSpans(trim(rowCells[j]), self); + html += [" ", colHtml, "\n"].join(''); + } + html += "\n"; + } + + html += "\n"; + + // replace html with placeholder until postConversion step + return self.hashExtraBlock(html); + } + + return text; + }; + + + /****************************************************************** + * Footnotes * + *****************************************************************/ + + // Strip footnote, store in hashes. + Markdown.Extra.prototype.stripFootnoteDefinitions = function(text) { + var self = this; + + text = text.replace( + /\n[ ]{0,3}\[\^(.+?)\]\:[ \t]*\n?([\s\S]*?)\n{1,2}((?=\n[ ]{0,3}\S)|$)/g, + function(wholeMatch, m1, m2) { + m1 = slugify(m1); + m2 += "\n"; + m2 = m2.replace(/^[ ]{0,3}/g, ""); + self.footnotes[m1] = m2; + return "\n"; + }); + + return text; + }; + + + // Find and convert footnotes references. + Markdown.Extra.prototype.doFootnotes = function(text) { + var self = this; + if(self.isConvertingFootnote === true) { + return text; + } + + var footnoteCounter = 0; + text = text.replace(/\[\^(.+?)\]/g, function(wholeMatch, m1) { + var id = slugify(m1); + var footnote = self.footnotes[id]; + if (footnote === undefined) { + return wholeMatch; + } + footnoteCounter++; + self.usedFootnotes.push(id); + var html = '' + footnoteCounter + + ''; + return self.hashExtraInline(html); + }); + + return text; + }; + + // Print footnotes at the end of the document + Markdown.Extra.prototype.printFootnotes = function(text) { + var self = this; + + if (self.usedFootnotes.length === 0) { + return text; + } + + text += '\n\n
\n
\n
    \n\n'; + for(var i=0; i' + + formattedfootnote + + ' ↩\n\n'; + } + text += '
\n
'; + return text; + }; + + + /****************************************************************** + * Fenced Code Blocks (gfm) * + ******************************************************************/ + + // Find and convert gfm-inspired fenced code blocks into html. + Markdown.Extra.prototype.fencedCodeBlocks = function(text) { + function encodeCode(code) { + code = code.replace(/&/g, "&"); + code = code.replace(//g, ">"); + // These were escaped by PageDown before postNormalization + code = code.replace(/~D/g, "$$"); + code = code.replace(/~T/g, "~"); + return code; + } + + var self = this; + text = text.replace(/(?:^|\n)```[ \t]*(\S*)[ \t]*\n([\s\S]*?)\n```[ \t]*(?=\n)/g, function(match, m1, m2) { + var language = m1, codeblock = m2; + + // adhere to specified options + var preclass = self.googleCodePrettify ? ' class="prettyprint"' : ''; + var codeclass = ''; + if (language) { + if (self.googleCodePrettify || self.highlightJs) { + // use html5 language- class names. supported by both prettify and highlight.js + codeclass = ' class="language-' + language + '"'; + } else { + codeclass = ' class="' + language + '"'; + } + } + + var html = ['', + encodeCode(codeblock), ''].join(''); + + // replace codeblock with placeholder until postConversion step + return self.hashExtraBlock(html); + }); + + return text; + }; + + + /****************************************************************** + * SmartyPants * + ******************************************************************/ + + Markdown.Extra.prototype.educatePants = function(text) { + var self = this; + var result = ''; + var blockOffset = 0; + // Here we parse HTML in a very bad manner + text.replace(/(?:)|(<)([a-zA-Z1-6]+)([^\n]*?>)([\s\S]*?)(<\/\2>)/g, function(wholeMatch, m1, m2, m3, m4, m5, offset) { + var token = text.substring(blockOffset, offset); + result += self.applyPants(token); + self.smartyPantsLastChar = result.substring(result.length - 1); + blockOffset = offset + wholeMatch.length; + if(!m1) { + // Skip commentary + result += wholeMatch; + return; + } + // Skip special tags + if(!/code|kbd|pre|script|noscript|iframe|math|ins|del|pre/i.test(m2)) { + m4 = self.educatePants(m4); + } + else { + self.smartyPantsLastChar = m4.substring(m4.length - 1); + } + result += m1 + m2 + m3 + m4 + m5; + }); + var lastToken = text.substring(blockOffset); + result += self.applyPants(lastToken); + self.smartyPantsLastChar = result.substring(result.length - 1); + return result; + }; + + function revertPants(wholeMatch, m1) { + var blockText = m1; + blockText = blockText.replace(/&\#8220;/g, "\""); + blockText = blockText.replace(/&\#8221;/g, "\""); + blockText = blockText.replace(/&\#8216;/g, "'"); + blockText = blockText.replace(/&\#8217;/g, "'"); + blockText = blockText.replace(/&\#8212;/g, "---"); + blockText = blockText.replace(/&\#8211;/g, "--"); + blockText = blockText.replace(/&\#8230;/g, "..."); + return blockText; + } + + Markdown.Extra.prototype.applyPants = function(text) { + // Dashes + text = text.replace(/---/g, "—").replace(/--/g, "–"); + // Ellipses + text = text.replace(/\.\.\./g, "…").replace(/\.\s\.\s\./g, "…"); + // Backticks + text = text.replace(/``/g, "“").replace (/''/g, "”"); + + if(/^'$/.test(text)) { + // Special case: single-character ' token + if(/\S/.test(this.smartyPantsLastChar)) { + return "’"; + } + return "‘"; + } + if(/^"$/.test(text)) { + // Special case: single-character " token + if(/\S/.test(this.smartyPantsLastChar)) { + return "”"; + } + return "“"; + } + + // Special case if the very first character is a quote + // followed by punctuation at a non-word-break. Close the quotes by brute force: + text = text.replace (/^'(?=[!"#\$\%'()*+,\-.\/:;<=>?\@\[\\]\^_`{|}~]\B)/, "’"); + text = text.replace (/^"(?=[!"#\$\%'()*+,\-.\/:;<=>?\@\[\\]\^_`{|}~]\B)/, "”"); + + // Special case for double sets of quotes, e.g.: + //

He said, "'Quoted' words in a larger quote."

+ text = text.replace(/"'(?=\w)/g, "“‘"); + text = text.replace(/'"(?=\w)/g, "‘“"); + + // Special case for decade abbreviations (the '80s): + text = text.replace(/'(?=\d{2}s)/g, "’"); + + // Get most opening single quotes: + text = text.replace(/(\s| |--|&[mn]dash;|&\#8211;|&\#8212;|&\#x201[34];)'(?=\w)/g, "$1‘"); + + // Single closing quotes: + text = text.replace(/([^\s\[\{\(\-])'/g, "$1’"); + text = text.replace(/'(?=\s|s\b)/g, "’"); + + // Any remaining single quotes should be opening ones: + text = text.replace(/'/g, "‘"); + + // Get most opening double quotes: + text = text.replace(/(\s| |--|&[mn]dash;|&\#8211;|&\#8212;|&\#x201[34];)"(?=\w)/g, "$1“"); + + // Double closing quotes: + text = text.replace(/([^\s\[\{\(\-])"/g, "$1”"); + text = text.replace(/"(?=\s)/g, "”"); + + // Any remaining quotes should be opening ones. + text = text.replace(/"/ig, "“"); + return text; + }; + + // Find and convert markdown extra definition lists into html. + Markdown.Extra.prototype.runSmartyPants = function(text) { + this.smartyPantsLastChar = ''; + text = this.educatePants(text); + // Clean everything inside html tags (some of them may have been converted due to our rough html parsing) + text = text.replace(/(<([a-zA-Z1-6]+)\b([^\n>]*?)(\/)?>)/g, revertPants); + return text; + }; + + /****************************************************************** + * Definition Lists * + ******************************************************************/ + + // Find and convert markdown extra definition lists into html. + Markdown.Extra.prototype.definitionLists = function(text) { + var wholeList = new RegExp( + ['(\\x02\\n?|\\n\\n)' , + '(?:' , + '(' , // $1 = whole list + '(' , // $2 + '[ ]{0,3}' , + '((?:[ \\t]*\\S.*\\n)+)', // $3 = defined term + '\\n?' , + '[ ]{0,3}:[ ]+' , // colon starting definition + ')' , + '([\\s\\S]+?)' , + '(' , // $4 + '(?=\\0x03)' , // \z + '|' , + '(?=' , + '\\n{2,}' , + '(?=\\S)' , + '(?!' , // Negative lookahead for another term + '[ ]{0,3}' , + '(?:\\S.*\\n)+?' , // defined term + '\\n?' , + '[ ]{0,3}:[ ]+' , // colon starting definition + ')' , + '(?!' , // Negative lookahead for another definition + '[ ]{0,3}:[ ]+' , // colon starting definition + ')' , + ')' , + ')' , + ')' , + ')' + ].join(''), + 'gm' + ); + + var self = this; + text = addAnchors(text); + + text = text.replace(wholeList, function(match, pre, list) { + var result = trim(self.processDefListItems(list)); + result = "
\n" + result + "\n
"; + return pre + self.hashExtraBlock(result) + "\n\n"; + }); + + return removeAnchors(text); + }; + + // Process the contents of a single definition list, splitting it + // into individual term and definition list items. + Markdown.Extra.prototype.processDefListItems = function(listStr) { + var self = this; + + var dt = new RegExp( + ['(\\x02\\n?|\\n\\n+)' , // leading line + '(' , // definition terms = $1 + '[ ]{0,3}' , // leading whitespace + '(?![:][ ]|[ ])' , // negative lookahead for a definition + // mark (colon) or more whitespace + '(?:\\S.*\\n)+?' , // actual term (not whitespace) + ')' , + '(?=\\n?[ ]{0,3}:[ ])' // lookahead for following line feed + ].join(''), // with a definition mark + 'gm' + ); + + var dd = new RegExp( + ['\\n(\\n+)?' , // leading line = $1 + '(' , // marker space = $2 + '[ ]{0,3}' , // whitespace before colon + '[:][ ]+' , // definition mark (colon) + ')' , + '([\\s\\S]+?)' , // definition text = $3 + '(?=\\n*' , // stop at next definition mark, + '(?:' , // next term or end of text + '\\n[ ]{0,3}[:][ ]|' , + '
|\\x03' , // \z + ')' , + ')' + ].join(''), + 'gm' + ); + + listStr = addAnchors(listStr); + // trim trailing blank lines: + listStr = listStr.replace(/\n{2,}(?=\\x03)/, "\n"); + + // Process definition terms. + listStr = listStr.replace(dt, function(match, pre, termsStr) { + var terms = trim(termsStr).split("\n"); + var text = ''; + for (var i = 0; i < terms.length; i++) { + var term = terms[i]; + // process spans inside dt + term = convertSpans(trim(term), self); + text += "\n
" + term + "
"; + } + return text + "\n"; + }); + + // Process actual definitions. + listStr = listStr.replace(dd, function(match, leadingLine, markerSpace, def) { + if (leadingLine || def.match(/\n{2,}/)) { + // replace marker with the appropriate whitespace indentation + def = Array(markerSpace.length + 1).join(' ') + def; + // process markdown inside definition + // TODO?: currently doesn't apply extensions + def = outdent(def) + "\n\n"; + def = "\n" + convertAll(def, self) + "\n"; + } else { + // convert span-level markdown inside definition + def = rtrim(def); + def = convertSpans(outdent(def), self); + } + + return "\n
" + def + "
\n"; + }); + + return removeAnchors(listStr); + }; + + + /*********************************************************** + * Strikethrough * + ************************************************************/ + + Markdown.Extra.prototype.strikethrough = function(text) { + // Pretty much duplicated from _DoItalicsAndBold + return text.replace(/([\W_]|^)~T~T(?=\S)([^\r]*?\S[\*_]*)~T~T([\W_]|$)/g, + "$1$2$3"); + }; + + + /*********************************************************** + * New lines * + ************************************************************/ + + Markdown.Extra.prototype.newlines = function(text) { + // We have to ignore already converted newlines and line breaks in sub-list items + return text.replace(/(<(?:br|\/li)>)?\n/g, function(wholeMatch, previousTag) { + return previousTag ? wholeMatch : "
\n"; + }); + }; + +})();