function diff_match_patch() {
this.Diff_Timeout = 1.0;
this.Diff_EditCost = 4;
this.Match_Threshold = 0.5;
this.Match_Distance = 1000;
this.Patch_DeleteThreshold = 0.5;
this.Patch_Margin = 4;
this.Match_MaxBits = 32;
}
var DIFF_DELETE = -1;
var DIFF_INSERT = 1;
var DIFF_EQUAL = 0;
diff_match_patch.Diff;
diff_match_patch.prototype.diff_main = function(text1, text2, opt_checklines,
opt_deadline) {
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;
if (text1 == null || text2 == null) {
throw new Error('Null input. (diff_main)');
}
if (text1 == text2) {
if (text1) {
return [[DIFF_EQUAL, text1]];
}
return [];
}
if (typeof opt_checklines == 'undefined') {
opt_checklines = true;
}
var checklines = opt_checklines;
var commonlength = this.diff_commonPrefix(text1, text2);
var commonprefix = text1.substring(0, commonlength);
text1 = text1.substring(commonlength);
text2 = text2.substring(commonlength);
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);
var diffs = this.diff_compute_(text1, text2, checklines, deadline);
if (commonprefix) {
diffs.unshift([DIFF_EQUAL, commonprefix]);
}
if (commonsuffix) {
diffs.push([DIFF_EQUAL, commonsuffix]);
}
this.diff_cleanupMerge(diffs);
return diffs;
};
diff_match_patch.prototype.diff_compute_ = function(text1, text2, checklines,
deadline) {
var diffs;
if (!text1) {
return [[DIFF_INSERT, text2]];
}
if (!text2) {
return [[DIFF_DELETE, text1]];
}
var tr = deadline - new Date();
if (tr < 0) {
return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
}
var longtext = text1.length > text2.length ? text1 : text2;
var shorttext = text1.length > text2.length ? text2 : text1;
var i = longtext.indexOf(shorttext);
if (i != -1) {
diffs = [[DIFF_INSERT, longtext.substring(0, i)],
[DIFF_EQUAL, shorttext],
[DIFF_INSERT, longtext.substring(i + shorttext.length)]];
if (text1.length > text2.length) {
diffs[0][0] = diffs[2][0] = DIFF_DELETE;
}
return diffs;
}
if (shorttext.length == 1) {
return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
}
var hm = this.diff_halfMatch_(text1, text2, deadline);
tr = deadline - new Date();
if (tr < 0) {
return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
}
if (hm) {
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];
var diffs_a = this.diff_main(text1_a, text2_a, checklines, deadline);
var diffs_b = this.diff_main(text1_b, text2_b, checklines, deadline);
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);
};
diff_match_patch.prototype.diff_lineMode_ = function(text1, text2, deadline) {
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);
this.diff_charsToLines_(diffs, linearray);
this.diff_cleanupSemantic(diffs);
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:
if (count_delete >= 1 && count_insert >= 1) {
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();
return diffs;
};
diff_match_patch.prototype.diff_bisect_ = function(text1, text2, deadline) {
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);
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;
var front = (delta % 2 != 0);
var k1start = 0;
var k1end = 0;
var k2start = 0;
var k2end = 0;
for (var d = 0; d < max_d; d++) {
if ((new Date()).getTime() > deadline) {
break;
}
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) {
k1end += 2;
} else if (y1 > text2_length) {
k1start += 2;
} else if (front) {
var k2_offset = v_offset + delta - k1;
if (k2_offset >= 0 && k2_offset < v_length && v2[k2_offset] != -1) {
var x2 = text1_length - v2[k2_offset];
if (x1 >= x2) {
return this.diff_bisectSplit_(text1, text2, x1, y1, deadline);
}
}
}
}
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) {
k2end += 2;
} else if (y2 > text2_length) {
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;
x2 = text1_length - x2;
if (x1 >= x2) {
return this.diff_bisectSplit_(text1, text2, x1, y1, deadline);
}
}
}
}
}
return [[DIFF_DELETE, text1], [DIFF_INSERT, text2]];
};
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);
var diffs = this.diff_main(text1a, text2a, false, deadline);
var diffsb = this.diff_main(text1b, text2b, false, deadline);
return diffs.concat(diffsb);
};
diff_match_patch.prototype.diff_linesToChars_ = function(text1, text2) {
var lineArray = [];
var lineHash = {};
lineArray[0] = '';
function diff_linesToCharsMunge_(text) {
var chars = '';
var lineStart = 0;
var lineEnd = -1;
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};
};
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('');
}
};
diff_match_patch.prototype.diff_commonPrefix = function(text1, text2) {
if (!text1 || !text2 || text1.charAt(0) != text2.charAt(0)) {
return 0;
}
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;
};
diff_match_patch.prototype.diff_commonSuffix = function(text1, text2) {
if (!text1 || !text2 ||
text1.charAt(text1.length - 1) != text2.charAt(text2.length - 1)) {
return 0;
}
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;
};
diff_match_patch.prototype.diff_commonOverlap_ = function(text1, text2) {
var text1_length = text1.length;
var text2_length = text2.length;
if (text1_length == 0 || text2_length == 0) {
return 0;
}
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);
if (text1 == text2) {
return text_length;
}
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++;
}
}
};
diff_match_patch.prototype.diff_halfMatch_ = function(text1, text2, deadline) {
if (this.Diff_Timeout <= 0) {
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;
}
var dmp = this;
function diff_halfMatchI_(longtext, shorttext, i) {
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;
var tr;
var k = 0;
while ((j = shorttext.indexOf(seed, j + 1)) != -1) {
k += 1;
if (k % 100 === 0) {
tr = deadline - new Date();
if (tr < 0) {
return null;
}
}
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;
}
}
var hm1 = diff_halfMatchI_(longtext, shorttext,
Math.ceil(longtext.length / 4));
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 {
hm = hm1[4].length > hm2[4].length ? hm1 : hm2;
}
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];
};
diff_match_patch.prototype.diff_cleanupSemantic = function(diffs) {
var changes = false;
var equalities = [];
var equalitiesLength = 0;
var lastequality = null;
var pointer = 0;
var length_insertions1 = 0;
var length_deletions1 = 0;
var length_insertions2 = 0;
var length_deletions2 = 0;
while (pointer < diffs.length) {
if (diffs[pointer][0] == DIFF_EQUAL) {
equalities[equalitiesLength++] = pointer;
length_insertions1 = length_insertions2;
length_deletions1 = length_deletions2;
length_insertions2 = 0;
length_deletions2 = 0;
lastequality = diffs[pointer][1];
} else {
if (diffs[pointer][0] == DIFF_INSERT) {
length_insertions2 += diffs[pointer][1].length;
} else {
length_deletions2 += diffs[pointer][1].length;
}
if (lastequality && (lastequality.length <=
Math.max(length_insertions1, length_deletions1)) &&
(lastequality.length <= Math.max(length_insertions2,
length_deletions2))) {
diffs.splice(equalities[equalitiesLength - 1], 0,
[DIFF_DELETE, lastequality]);
diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
equalitiesLength--;
equalitiesLength--;
pointer = equalitiesLength > 0 ? equalities[equalitiesLength - 1] : -1;
length_insertions1 = 0;
length_deletions1 = 0;
length_insertions2 = 0;
length_deletions2 = 0;
lastequality = null;
changes = true;
}
}
pointer++;
}
if (changes) {
this.diff_cleanupMerge(diffs);
}
this.diff_cleanupSemanticLossless(diffs);
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) {
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) {
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++;
}
};
diff_match_patch.prototype.diff_cleanupSemanticLossless = function(diffs) {
function diff_cleanupSemanticScore_(one, two) {
if (!one || !two) {
return 6;
}
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) {
return 5;
} else if (lineBreak1 || lineBreak2) {
return 4;
} else if (nonAlphaNumeric1 && !whitespace1 && whitespace2) {
return 3;
} else if (whitespace1 || whitespace2) {
return 2;
} else if (nonAlphaNumeric1 || nonAlphaNumeric2) {
return 1;
}
return 0;
}
var pointer = 1;
while (pointer < diffs.length - 1) {
if (diffs[pointer - 1][0] == DIFF_EQUAL &&
diffs[pointer + 1][0] == DIFF_EQUAL) {
var equality1 = diffs[pointer - 1][1];
var edit = diffs[pointer][1];
var equality2 = diffs[pointer + 1][1];
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;
}
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);
if (score >= bestScore) {
bestScore = score;
bestEquality1 = equality1;
bestEdit = edit;
bestEquality2 = equality2;
}
}
if (diffs[pointer - 1][1] != bestEquality1) {
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++;
}
};
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/;
diff_match_patch.prototype.diff_cleanupEfficiency = function(diffs) {
var changes = false;
var equalities = [];
var equalitiesLength = 0;
var lastequality = null;
var pointer = 0;
var pre_ins = false;
var pre_del = false;
var post_ins = false;
var post_del = false;
while (pointer < diffs.length) {
if (diffs[pointer][0] == DIFF_EQUAL) {
if (diffs[pointer][1].length < this.Diff_EditCost &&
(post_ins || post_del)) {
equalities[equalitiesLength++] = pointer;
pre_ins = post_ins;
pre_del = post_del;
lastequality = diffs[pointer][1];
} else {
equalitiesLength = 0;
lastequality = null;
}
post_ins = post_del = false;
} else {
if (diffs[pointer][0] == DIFF_DELETE) {
post_del = true;
} else {
post_ins = true;
}
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))) {
diffs.splice(equalities[equalitiesLength - 1], 0,
[DIFF_DELETE, lastequality]);
diffs[equalities[equalitiesLength - 1] + 1][0] = DIFF_INSERT;
equalitiesLength--;
lastequality = null;
if (pre_ins && pre_del) {
post_ins = post_del = true;
equalitiesLength = 0;
} else {
equalitiesLength--;
pointer = equalitiesLength > 0 ?
equalities[equalitiesLength - 1] : -1;
post_ins = post_del = false;
}
changes = true;
}
}
pointer++;
}
if (changes) {
this.diff_cleanupMerge(diffs);
}
};
diff_match_patch.prototype.diff_cleanupMerge = function(diffs) {
diffs.push([DIFF_EQUAL, '']);
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:
if (count_delete + count_insert > 1) {
if (count_delete !== 0 && count_insert !== 0) {
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);
}
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);
}
}
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) {
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();
}
var changes = false;
pointer = 1;
while (pointer < diffs.length - 1) {
if (diffs[pointer - 1][0] == DIFF_EQUAL &&
diffs[pointer + 1][0] == DIFF_EQUAL) {
if (diffs[pointer][1].substring(diffs[pointer][1].length -
diffs[pointer - 1][1].length) == diffs[pointer - 1][1]) {
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]) {
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 (changes) {
this.diff_cleanupMerge(diffs);
}
};
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) {
chars1 += diffs[x][1].length;
}
if (diffs[x][0] !== DIFF_DELETE) {
chars2 += diffs[x][1].length;
}
if (chars1 > loc) {
break;
}
last_chars1 = chars1;
last_chars2 = chars2;
}
if (diffs.length != x && diffs[x][0] === DIFF_DELETE) {
return last_chars2;
}
return last_chars2 + (loc - last_chars1);
};
diff_match_patch.prototype.diff_prettyHtml = function(diffs) {
var html = [];
var pattern_amp = /&/g;
var pattern_lt = /</g;
var pattern_gt = />/g;
var pattern_para = /\n/g;
for (var x = 0; x < diffs.length; x++) {
var op = diffs[x][0];
var data = diffs[x][1];
var text = data.replace(pattern_amp, '&').replace(pattern_lt, '<')
.replace(pattern_gt, '>').replace(pattern_para, '¶<br>');
switch (op) {
case DIFF_INSERT:
html[x] = '<ins style="background:#e6ffe6;">' + text + '</ins>';
break;
case DIFF_DELETE:
html[x] = '<del style="background:#ffe6e6;">' + text + '</del>';
break;
case DIFF_EQUAL:
html[x] = '<span>' + text + '</span>';
break;
}
}
return html.join('');
};
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('');
};
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('');
};
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:
levenshtein += Math.max(insertions, deletions);
insertions = 0;
deletions = 0;
break;
}
}
levenshtein += Math.max(insertions, deletions);
return levenshtein;
};
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, ' ');
};
diff_match_patch.prototype.diff_fromDelta = function(text1, delta) {
var diffs = [];
var diffsLength = 0;
var pointer = 0;
var tokens = delta.split(/\t/g);
for (var x = 0; x < tokens.length; x++) {
var param = tokens[x].substring(1);
switch (tokens[x].charAt(0)) {
case '+':
try {
diffs[diffsLength++] = [DIFF_INSERT, decodeURI(param)];
} catch (ex) {
throw new Error('Illegal escape in diff_fromDelta: ' + param);
}
break;
case '-':
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:
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;
};
diff_match_patch.prototype.match_main = function(text, pattern, loc) {
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) {
return 0;
} else if (!text.length) {
return -1;
} else if (text.substring(loc, loc + pattern.length) == pattern) {
return loc;
} else {
return this.match_bitap_(text, pattern, loc);
}
};
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.');
}
var s = this.match_alphabet_(pattern);
var dmp = this;
function match_bitapScore_(e, x) {
var accuracy = e / pattern.length;
var proximity = Math.abs(loc - x);
if (!dmp.Match_Distance) {
return proximity ? 1.0 : accuracy;
}
return accuracy + (proximity / dmp.Match_Distance);
}
var score_threshold = this.Match_Threshold;
var best_loc = text.indexOf(pattern, loc);
if (best_loc != -1) {
score_threshold = Math.min(match_bitapScore_(0, best_loc), score_threshold);
best_loc = text.lastIndexOf(pattern, loc + pattern.length);
if (best_loc != -1) {
score_threshold =
Math.min(match_bitapScore_(0, best_loc), score_threshold);
}
}
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++) {
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);
}
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--) {
var charMatch = s[text.charAt(j - 1)];
if (d === 0) {
rd[j] = ((rd[j + 1] << 1) | 1) & charMatch;
} else {
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);
if (score <= score_threshold) {
score_threshold = score;
best_loc = j - 1;
if (best_loc > loc) {
start = Math.max(1, 2 * loc - best_loc);
} else {
break;
}
}
}
}
if (match_bitapScore_(d + 1, loc) > score_threshold) {
break;
}
last_rd = rd;
}
return best_loc;
};
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;
};
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;
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);
}
padding += this.Patch_Margin;
var prefix = text.substring(patch.start2 - padding, patch.start2);
if (prefix) {
patch.diffs.unshift([DIFF_EQUAL, prefix]);
}
var suffix = text.substring(patch.start2 + patch.length1,
patch.start2 + patch.length1 + padding);
if (suffix) {
patch.diffs.push([DIFF_EQUAL, suffix]);
}
patch.start1 -= prefix.length;
patch.start2 -= prefix.length;
patch.length1 += prefix.length + suffix.length;
patch.length2 += prefix.length + suffix.length;
};
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') {
text1 = (a);
diffs = this.diff_main(text1, (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') {
diffs = (a);
text1 = this.diff_text1(diffs);
} else if (typeof a == 'string' && opt_b && typeof opt_b == 'object' &&
typeof opt_c == 'undefined') {
text1 = (a);
diffs = (opt_b);
} else if (typeof a == 'string' && typeof opt_b == 'string' &&
opt_c && typeof opt_c == 'object') {
text1 = (a);
diffs = (opt_c);
} else {
throw new Error('Unknown call format to patch_make.');
}
if (diffs.length === 0) {
return [];
}
var patches = [];
var patch = new diff_match_patch.patch_obj();
var patchDiffLength = 0;
var char_count1 = 0;
var char_count2 = 0;
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) {
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) {
patch.diffs[patchDiffLength++] = diffs[x];
patch.length1 += diff_text.length;
patch.length2 += diff_text.length;
} else if (diff_text.length >= 2 * this.Patch_Margin) {
if (patchDiffLength) {
this.patch_addContext_(patch, prepatch_text);
patches.push(patch);
patch = new diff_match_patch.patch_obj();
patchDiffLength = 0;
prepatch_text = postpatch_text;
char_count1 = char_count2;
}
}
break;
}
if (diff_type !== DIFF_INSERT) {
char_count1 += diff_text.length;
}
if (diff_type !== DIFF_DELETE) {
char_count2 += diff_text.length;
}
}
if (patchDiffLength) {
this.patch_addContext_(patch, prepatch_text);
patches.push(patch);
}
return patches;
};
diff_match_patch.prototype.patch_deepCopy = function(patches) {
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;
};
diff_match_patch.prototype.patch_apply = function(patches, text) {
if (patches.length == 0) {
return [text, []];
}
patches = this.patch_deepCopy(patches);
var nullPadding = this.patch_addPadding(patches);
text = nullPadding + text + nullPadding;
this.patch_splitMax(patches);
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) {
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) {
start_loc = -1;
}
}
} else {
start_loc = this.match_main(text, text1, expected_loc);
}
if (start_loc == -1) {
results[x] = false;
delta -= patches[x].length2 - patches[x].length1;
} else {
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) {
text = text.substring(0, start_loc) +
this.diff_text2(patches[x].diffs) +
text.substring(start_loc + text1.length);
} else {
var diffs = this.diff_main(text1, text2, false);
if (text1.length > this.Match_MaxBits &&
this.diff_levenshtein(diffs) / text1.length >
this.Patch_DeleteThreshold) {
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) {
text = text.substring(0, start_loc + index2) + mod[1] +
text.substring(start_loc + index2);
} else if (mod[0] === DIFF_DELETE) {
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;
}
}
}
}
}
}
text = text.substring(nullPadding.length, text.length - nullPadding.length);
return [text, results];
};
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);
}
for (var x = 0; x < patches.length; x++) {
patches[x].start1 += paddingLength;
patches[x].start2 += paddingLength;
}
var patch = patches[0];
var diffs = patch.diffs;
if (diffs.length == 0 || diffs[0][0] != DIFF_EQUAL) {
diffs.unshift([DIFF_EQUAL, nullPadding]);
patch.start1 -= paddingLength;
patch.start2 -= paddingLength;
patch.length1 += paddingLength;
patch.length2 += paddingLength;
} else if (paddingLength > diffs[0][1].length) {
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;
}
patch = patches[patches.length - 1];
diffs = patch.diffs;
if (diffs.length == 0 || diffs[diffs.length - 1][0] != DIFF_EQUAL) {
diffs.push([DIFF_EQUAL, nullPadding]);
patch.length1 += paddingLength;
patch.length2 += paddingLength;
} else if (paddingLength > diffs[diffs.length - 1][1].length) {
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;
};
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];
patches.splice(x--, 1);
var start1 = bigpatch.start1;
var start2 = bigpatch.start2;
var precontext = '';
while (bigpatch.diffs.length !== 0) {
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) {
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) {
patch.length1 += diff_text.length;
start1 += diff_text.length;
empty = false;
patch.diffs.push([diff_type, diff_text]);
bigpatch.diffs.shift();
} else {
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);
}
}
}
precontext = this.diff_text2(patch.diffs);
precontext =
precontext.substring(precontext.length - this.Patch_Margin);
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);
}
}
}
};
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('');
};
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) {
throw new Error('Illegal escape in patch_fromText: ' + line);
}
if (sign == '-') {
patch.diffs.push([DIFF_DELETE, line]);
} else if (sign == '+') {
patch.diffs.push([DIFF_INSERT, line]);
} else if (sign == ' ') {
patch.diffs.push([DIFF_EQUAL, line]);
} else if (sign == '@') {
break;
} else if (sign === '') {
} else {
throw new Error('Invalid patch mode "' + sign + '" in: ' + line);
}
textPointer++;
}
}
return patches;
};
diff_match_patch.patch_obj = function() {
this.diffs = [];
this.start1 = null;
this.start2 = null;
this.length1 = 0;
this.length2 = 0;
};
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;
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, ' ');
};
this['diff_match_patch'] = diff_match_patch;
this['DIFF_DELETE'] = DIFF_DELETE;
this['DIFF_INSERT'] = DIFF_INSERT;
this['DIFF_EQUAL'] = DIFF_EQUAL;