(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global.Diff = {}));
})(this, (function (exports) { 'use strict';
function Diff() {}
Diff.prototype = {
diff: function diff(oldString, newString) {
var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
var callback = options.callback;
if (typeof options === 'function') {
callback = options;
options = {};
}
this.options = options;
var self = this;
function done(value) {
if (callback) {
setTimeout(function () {
callback(undefined, value);
}, 0);
return true;
} else {
return value;
}
}
// Allow subclasses to massage the input prior to running
oldString = this.castInput(oldString);
newString = this.castInput(newString);
oldString = this.removeEmpty(this.tokenize(oldString));
newString = this.removeEmpty(this.tokenize(newString));
var newLen = newString.length,
oldLen = oldString.length;
var editLength = 1;
var maxEditLength = newLen + oldLen;
var bestPath = [{
newPos: -1,
components: []
}];
// Seed editLength = 0, i.e. the content starts with the same values
var oldPos = this.extractCommon(bestPath[0], newString, oldString, 0);
if (bestPath[0].newPos + 1 >= newLen && oldPos + 1 >= oldLen) {
// Identity per the equality and tokenizer
return done([{
value: this.join(newString),
count: newString.length
}]);
}
// Main worker method. checks all permutations of a given edit length for acceptance.
function execEditLength() {
for (var diagonalPath = -1 * editLength; diagonalPath <= editLength; diagonalPath += 2) {
var basePath = void 0;
var addPath = bestPath[diagonalPath - 1],
removePath = bestPath[diagonalPath + 1],
_oldPos = (removePath ? removePath.newPos : 0) - diagonalPath;
if (addPath) {
// No one else is going to attempt to use this value, clear it
bestPath[diagonalPath - 1] = undefined;
}
var canAdd = addPath && addPath.newPos + 1 < newLen,
canRemove = removePath && 0 <= _oldPos && _oldPos < oldLen;
if (!canAdd && !canRemove) {
// If this path is a terminal then prune
bestPath[diagonalPath] = undefined;
continue;
}
// Select the diagonal that we want to branch from. We select the prior
// path whose position in the new string is the farthest from the origin
// and does not pass the bounds of the diff graph
if (!canAdd || canRemove && addPath.newPos < removePath.newPos) {
basePath = clonePath(removePath);
self.pushComponent(basePath.components, undefined, true);
} else {
basePath = addPath; // No need to clone, we've pulled it from the list
basePath.newPos++;
self.pushComponent(basePath.components, true, undefined);
}
_oldPos = self.extractCommon(basePath, newString, oldString, diagonalPath);
// If we have hit the end of both strings, then we are done
if (basePath.newPos + 1 >= newLen && _oldPos + 1 >= oldLen) {
return done(buildValues(self, basePath.components, newString, oldString, self.useLongestToken));
} else {
// Otherwise track this path as a potential candidate and continue.
bestPath[diagonalPath] = basePath;
}
}
editLength++;
}
// Performs the length of edit iteration. Is a bit fugly as this has to support the
// sync and async mode which is never fun. Loops over execEditLength until a value
// is produced.
if (callback) {
(function exec() {
setTimeout(function () {
// This should not happen, but we want to be safe.
/* istanbul ignore next */
if (editLength > maxEditLength) {
return callback();
}
if (!execEditLength()) {
exec();
}
}, 0);
})();
} else {
while (editLength <= maxEditLength) {
var ret = execEditLength();
if (ret) {
return ret;
}
}
}
},
pushComponent: function pushComponent(components, added, removed) {
var last = components[components.length - 1];
if (last && last.added === added && last.removed === removed) {
// We need to clone here as the component clone operation is just
// as shallow array clone
components[components.length - 1] = {
count: last.count + 1,
added: added,
removed: removed
};
} else {
components.push({
count: 1,
added: added,
removed: removed
});
}
},
extractCommon: function extractCommon(basePath, newString, oldString, diagonalPath) {
var newLen = newString.length,
oldLen = oldString.length,
newPos = basePath.newPos,
oldPos = newPos - diagonalPath,
commonCount = 0;
while (newPos + 1 < newLen && oldPos + 1 < oldLen && this.equals(newString[newPos + 1], oldString[oldPos + 1])) {
newPos++;
oldPos++;
commonCount++;
}
if (commonCount) {
basePath.components.push({
count: commonCount
});
}
basePath.newPos = newPos;
return oldPos;
},
equals: function equals(left, right) {
if (this.options.comparator) {
return this.options.comparator(left, right);
} else {
return left === right || this.options.ignoreCase && left.toLowerCase() === right.toLowerCase();
}
},
removeEmpty: function removeEmpty(array) {
var ret = [];
for (var i = 0; i < array.length; i++) {
if (array[i]) {
ret.push(array[i]);
}
}
return ret;
},
castInput: function castInput(value) {
return value;
},
tokenize: function tokenize(value) {
return value.split('');
},
join: function join(chars) {
return chars.join('');
}
};
function buildValues(diff, components, newString, oldString, useLongestToken) {
var componentPos = 0,
componentLen = components.length,
newPos = 0,
oldPos = 0;
for (; componentPos < componentLen; componentPos++) {
var component = components[componentPos];
if (!component.removed) {
if (!component.added && useLongestToken) {
var value = newString.slice(newPos, newPos + component.count);
value = value.map(function (value, i) {
var oldValue = oldString[oldPos + i];
return oldValue.length > value.length ? oldValue : value;
});
component.value = diff.join(value);
} else {
component.value = diff.join(newString.slice(newPos, newPos + component.count));
}
newPos += component.count;
// Common case
if (!component.added) {
oldPos += component.count;
}
} else {
component.value = diff.join(oldString.slice(oldPos, oldPos + component.count));
oldPos += component.count;
// Reverse add and remove so removes are output first to match common convention
// The diffing algorithm is tied to add then remove output and this is the simplest
// route to get the desired output with minimal overhead.
if (componentPos && components[componentPos - 1].added) {
var tmp = components[componentPos - 1];
components[componentPos - 1] = components[componentPos];
components[componentPos] = tmp;
}
}
}
// Special case handle for when one terminal is ignored (i.e. whitespace).
// For this case we merge the terminal into the prior string and drop the change.
// This is only available for string mode.
var lastComponent = components[componentLen - 1];
if (componentLen > 1 && typeof lastComponent.value === 'string' && (lastComponent.added || lastComponent.removed) && diff.equals('', lastComponent.value)) {
components[componentLen - 2].value += lastComponent.value;
components.pop();
}
return components;
}
function clonePath(path) {
return {
newPos: path.newPos,
components: path.components.slice(0)
};
}
var characterDiff = new Diff();
function diffChars(oldStr, newStr, options) {
return characterDiff.diff(oldStr, newStr, options);
}
function generateOptions(options, defaults) {
if (typeof options === 'function') {
defaults.callback = options;
} else if (options) {
for (var name in options) {
/* istanbul ignore else */
if (options.hasOwnProperty(name)) {
defaults[name] = options[name];
}
}
}
return defaults;
}
// Based on https://en.wikipedia.org/wiki/Latin_script_in_Unicode
//
// Ranges and exceptions:
// Latin-1 Supplement, 0080–00FF
// - U+00D7 × Multiplication sign
// - U+00F7 ÷ Division sign
// Latin Extended-A, 0100–017F
// Latin Extended-B, 0180–024F
// IPA Extensions, 0250–02AF
// Spacing Modifier Letters, 02B0–02FF
// - U+02C7 ˇ ˇ Caron
// - U+02D8 ˘ ˘ Breve
// - U+02D9 ˙ ˙ Dot Above
// - U+02DA ˚ ˚ Ring Above
// - U+02DB ˛ ˛ Ogonek
// - U+02DC ˜ ˜ Small Tilde
// - U+02DD ˝ ˝ Double Acute Accent
// Latin Extended Additional, 1E00–1EFF
var extendedWordChars = /^[A-Za-z\xC0-\u02C6\u02C8-\u02D7\u02DE-\u02FF\u1E00-\u1EFF]+$/;
var reWhitespace = /\S/;
var wordDiff = new Diff();
wordDiff.equals = function (left, right) {
if (this.options.ignoreCase) {
left = left.toLowerCase();
right = right.toLowerCase();
}
return left === right || this.options.ignoreWhitespace && !reWhitespace.test(left) && !reWhitespace.test(right);
};
wordDiff.tokenize = function (value) {
// All whitespace symbols except newline group into one token, each newline - in separate token
var tokens = value.split(/([^\S\r\n]+|[()[\]{}'"\r\n]|\b)/);
// Join the boundary splits that we do not consider to be boundaries. This is primarily the extended Latin character set.
for (var i = 0; i < tokens.length - 1; i++) {
// If we have an empty string in the next field and we have only word chars before and after, merge
if (!tokens[i + 1] && tokens[i + 2] && extendedWordChars.test(tokens[i]) && extendedWordChars.test(tokens[i + 2])) {
tokens[i] += tokens[i + 2];
tokens.splice(i + 1, 2);
i--;
}
}
return tokens;
};
function diffWords(oldStr, newStr, options) {
options = generateOptions(options, {
ignoreWhitespace: true
});
return wordDiff.diff(oldStr, newStr, options);
}
function diffWordsWithSpace(oldStr, newStr, options) {
return wordDiff.diff(oldStr, newStr, options);
}
var lineDiff = new Diff();
lineDiff.tokenize = function (value) {
var retLines = [],
linesAndNewlines = value.split(/(\n|\r\n)/);
// Ignore the final empty token that occurs if the string ends with a new line
if (!linesAndNewlines[linesAndNewlines.length - 1]) {
linesAndNewlines.pop();
}
// Merge the content and line separators into single tokens
for (var i = 0; i < linesAndNewlines.length; i++) {
var line = linesAndNewlines[i];
if (i % 2 && !this.options.newlineIsToken) {
retLines[retLines.length - 1] += line;
} else {
if (this.options.ignoreWhitespace) {
line = line.trim();
}
retLines.push(line);
}
}
return retLines;
};
function diffLines(oldStr, newStr, callback) {
return lineDiff.diff(oldStr, newStr, callback);
}
function diffTrimmedLines(oldStr, newStr, callback) {
var options = generateOptions(callback, {
ignoreWhitespace: true
});
return lineDiff.diff(oldStr, newStr, options);
}
var sentenceDiff = new Diff();
sentenceDiff.tokenize = function (value) {
return value.split(/(\S.+?[.!?])(?=\s+|$)/);
};
function diffSentences(oldStr, newStr, callback) {
return sentenceDiff.diff(oldStr, newStr, callback);
}
var cssDiff = new Diff();
cssDiff.tokenize = function (value) {
return value.split(/([{}:;,]|\s+)/);
};
function diffCss(oldStr, newStr, callback) {
return cssDiff.diff(oldStr, newStr, callback);
}
function _typeof(obj) {
"@babel/helpers - typeof";
return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) {
return typeof obj;
} : function (obj) {
return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
}, _typeof(obj);
}
function _toConsumableArray(arr) {
return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
}
function _arrayWithoutHoles(arr) {
if (Array.isArray(arr)) return _arrayLikeToArray(arr);
}
function _iterableToArray(iter) {
if (typeof Symbol !== "undefined" && iter[Symbol.iterator] != null || iter["@@iterator"] != null) return Array.from(iter);
}
function _unsupportedIterableToArray(o, minLen) {
if (!o) return;
if (typeof o === "string") return _arrayLikeToArray(o, minLen);
var n = Object.prototype.toString.call(o).slice(8, -1);
if (n === "Object" && o.constructor) n = o.constructor.name;
if (n === "Map" || n === "Set") return Array.from(o);
if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
}
function _arrayLikeToArray(arr, len) {
if (len == null || len > arr.length) len = arr.length;
for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
return arr2;
}
function _nonIterableSpread() {
throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}
var objectPrototypeToString = Object.prototype.toString;
var jsonDiff = new Diff();
// Discriminate between two lines of pretty-printed, serialized JSON where one of them has a
// dangling comma and the other doesn't. Turns out including the dangling comma yields the nicest output:
jsonDiff.useLongestToken = true;
jsonDiff.tokenize = lineDiff.tokenize;
jsonDiff.castInput = function (value) {
var _this$options = this.options,
undefinedReplacement = _this$options.undefinedReplacement,
_this$options$stringi = _this$options.stringifyReplacer,
stringifyReplacer = _this$options$stringi === void 0 ? function (k, v) {
return typeof v === 'undefined' ? undefinedReplacement : v;
} : _this$options$stringi;
return typeof value === 'string' ? value : JSON.stringify(canonicalize(value, null, null, stringifyReplacer), stringifyReplacer, ' ');
};
jsonDiff.equals = function (left, right) {
return Diff.prototype.equals.call(jsonDiff, left.replace(/,([\r\n])/g, '$1'), right.replace(/,([\r\n])/g, '$1'));
};
function diffJson(oldObj, newObj, options) {
return jsonDiff.diff(oldObj, newObj, options);
}
// This function handles the presence of circular references by bailing out when encountering an
// object that is already on the "stack" of items being processed. Accepts an optional replacer
function canonicalize(obj, stack, replacementStack, replacer, key) {
stack = stack || [];
replacementStack = replacementStack || [];
if (replacer) {
obj = replacer(key, obj);
}
var i;
for (i = 0; i < stack.length; i += 1) {
if (stack[i] === obj) {
return replacementStack[i];
}
}
var canonicalizedObj;
if ('[object Array]' === objectPrototypeToString.call(obj)) {
stack.push(obj);
canonicalizedObj = new Array(obj.length);
replacementStack.push(canonicalizedObj);
for (i = 0; i < obj.length; i += 1) {
canonicalizedObj[i] = canonicalize(obj[i], stack, replacementStack, replacer, key);
}
stack.pop();
replacementStack.pop();
return canonicalizedObj;
}
if (obj && obj.toJSON) {
obj = obj.toJSON();
}
if (_typeof(obj) === 'object' && obj !== null) {
stack.push(obj);
canonicalizedObj = {};
replacementStack.push(canonicalizedObj);
var sortedKeys = [],
_key;
for (_key in obj) {
/* istanbul ignore else */
if (obj.hasOwnProperty(_key)) {
sortedKeys.push(_key);
}
}
sortedKeys.sort();
for (i = 0; i < sortedKeys.length; i += 1) {
_key = sortedKeys[i];
canonicalizedObj[_key] = canonicalize(obj[_key], stack, replacementStack, replacer, _key);
}
stack.pop();
replacementStack.pop();
} else {
canonicalizedObj = obj;
}
return canonicalizedObj;
}
var arrayDiff = new Diff();
arrayDiff.tokenize = function (value) {
return value.slice();
};
arrayDiff.join = arrayDiff.removeEmpty = function (value) {
return value;
};
function diffArrays(oldArr, newArr, callback) {
return arrayDiff.diff(oldArr, newArr, callback);
}
function parsePatch(uniDiff) {
var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
var diffstr = uniDiff.split(/\r\n|[\n\v\f\r\x85]/),
delimiters = uniDiff.match(/\r\n|[\n\v\f\r\x85]/g) || [],
list = [],
i = 0;
function parseIndex() {
var index = {};
list.push(index);
// Parse diff metadata
while (i < diffstr.length) {
var line = diffstr[i];
// File header found, end parsing diff metadata
if (/^(\-\-\-|\+\+\+|@@)\s/.test(line)) {
break;
}
// Diff index
var header = /^(?:Index:|diff(?: -r \w+)+)\s+(.+?)\s*$/.exec(line);
if (header) {
index.index = header[1];
}
i++;
}
// Parse file headers if they are defined. Unified diff requires them, but
// there's no technical issues to have an isolated hunk without file header
parseFileHeader(index);
parseFileHeader(index);
// Parse hunks
index.hunks = [];
while (i < diffstr.length) {
var _line = diffstr[i];
if (/^(Index:|diff|\-\-\-|\+\+\+)\s/.test(_line)) {
break;
} else if (/^@@/.test(_line)) {
index.hunks.push(parseHunk());
} else if (_line && options.strict) {
// Ignore unexpected content unless in strict mode
throw new Error('Unknown line ' + (i + 1) + ' ' + JSON.stringify(_line));
} else {
i++;
}
}
}
// Parses the --- and +++ headers, if none are found, no lines
// are consumed.
function parseFileHeader(index) {
var fileHeader = /^(---|\+\+\+)\s+(.*)$/.exec(diffstr[i]);
if (fileHeader) {
var keyPrefix = fileHeader[1] === '---' ? 'old' : 'new';
var data = fileHeader[2].split('\t', 2);
var fileName = data[0].replace(/\\\\/g, '\\');
if (/^".*"$/.test(fileName)) {
fileName = fileName.substr(1, fileName.length - 2);
}
index[keyPrefix + 'FileName'] = fileName;
index[keyPrefix + 'Header'] = (data[1] || '').trim();
i++;
}
}
// Parses a hunk
// This assumes that we are at the start of a hunk.
function parseHunk() {
var chunkHeaderIndex = i,
chunkHeaderLine = diffstr[i++],
chunkHeader = chunkHeaderLine.split(/@@ -(\d+)(?:,(\d+))? \+(\d+)(?:,(\d+))? @@/);
var hunk = {
oldStart: +chunkHeader[1],
oldLines: typeof chunkHeader[2] === 'undefined' ? 1 : +chunkHeader[2],
newStart: +chunkHeader[3],
newLines: typeof chunkHeader[4] === 'undefined' ? 1 : +chunkHeader[4],
lines: [],
linedelimiters: []
};
// Unified Diff Format quirk: If the chunk size is 0,
// the first number is one lower than one would expect.
// https://www.artima.com/weblogs/viewpost.jsp?thread=164293
if (hunk.oldLines === 0) {
hunk.oldStart += 1;
}
if (hunk.newLines === 0) {
hunk.newStart += 1;
}
var addCount = 0,
removeCount = 0;
for (; i < diffstr.length; i++) {
// Lines starting with '---' could be mistaken for the "remove line" operation
// But they could be the header for the next file. Therefore prune such cases out.
if (diffstr[i].indexOf('--- ') === 0 && i + 2 < diffstr.length && diffstr[i + 1].indexOf('+++ ') === 0 && diffstr[i + 2].indexOf('@@') === 0) {
break;
}
var operation = diffstr[i].length == 0 && i != diffstr.length - 1 ? ' ' : diffstr[i][0];
if (operation === '+' || operation === '-' || operation === ' ' || operation === '\\') {
hunk.lines.push(diffstr[i]);
hunk.linedelimiters.push(delimiters[i] || '\n');
if (operation === '+') {
addCount++;
} else if (operation === '-') {
removeCount++;
} else if (operation === ' ') {
addCount++;
removeCount++;
}
} else {
break;
}
}
// Handle the empty block count case
if (!addCount && hunk.newLines === 1) {
hunk.newLines = 0;
}
if (!removeCount && hunk.oldLines === 1) {
hunk.oldLines = 0;
}
// Perform optional sanity checking
if (options.strict) {
if (addCount !== hunk.newLines) {
throw new Error('Added line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
}
if (removeCount !== hunk.oldLines) {
throw new Error('Removed line count did not match for hunk at line ' + (chunkHeaderIndex + 1));
}
}
return hunk;
}
while (i < diffstr.length) {
parseIndex();
}
return list;
}
// Iterator that traverses in the range of [min, max], stepping
// by distance from a given start position. I.e. for [0, 4], with
// start of 2, this will iterate 2, 3, 1, 4, 0.
function distanceIterator (start, minLine, maxLine) {
var wantForward = true,
backwardExhausted = false,
forwardExhausted = false,
localOffset = 1;
return function iterator() {
if (wantForward && !forwardExhausted) {
if (backwardExhausted) {
localOffset++;
} else {
wantForward = false;
}
// Check if trying to fit beyond text length, and if not, check it fits
// after offset location (or desired location on first iteration)
if (start + localOffset <= maxLine) {
return localOffset;
}
forwardExhausted = true;
}
if (!backwardExhausted) {
if (!forwardExhausted) {
wantForward = true;
}
// Check if trying to fit before text beginning, and if not, check it fits
// before offset location
if (minLine <= start - localOffset) {
return -localOffset++;
}
backwardExhausted = true;
return iterator();
}
// We tried to fit hunk before text beginning and beyond text length, then
// hunk can't fit on the text. Return undefined
};
}
function applyPatch(source, uniDiff) {
var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
if (typeof uniDiff === 'string') {
uniDiff = parsePatch(uniDiff);
}
if (Array.isArray(uniDiff)) {
if (uniDiff.length > 1) {
throw new Error('applyPatch only works with a single input.');
}
uniDiff = uniDiff[0];
}
// Apply the diff to the input
var lines = source.split(/\r\n|[\n\v\f\r\x85]/),
delimiters = source.match(/\r\n|[\n\v\f\r\x85]/g) || [],
hunks = uniDiff.hunks,
compareLine = options.compareLine || function (lineNumber, line, operation, patchContent) {
return line === patchContent;
},
errorCount = 0,
fuzzFactor = options.fuzzFactor || 0,
minLine = 0,
offset = 0,
removeEOFNL,
addEOFNL;
/**
* Checks if the hunk exactly fits on the provided location
*/
function hunkFits(hunk, toPos) {
for (var j = 0; j < hunk.lines.length; j++) {
var line = hunk.lines[j],
operation = line.length > 0 ? line[0] : ' ',
content = line.length > 0 ? line.substr(1) : line;
if (operation === ' ' || operation === '-') {
// Context sanity check
if (!compareLine(toPos + 1, lines[toPos], operation, content)) {
errorCount++;
if (errorCount > fuzzFactor) {
return false;
}
}
toPos++;
}
}
return true;
}
// Search best fit offsets for each hunk based on the previous ones
for (var i = 0; i < hunks.length; i++) {
var hunk = hunks[i],
maxLine = lines.length - hunk.oldLines,
localOffset = 0,
toPos = offset + hunk.oldStart - 1;
var iterator = distanceIterator(toPos, minLine, maxLine);
for (; localOffset !== undefined; localOffset = iterator()) {
if (hunkFits(hunk, toPos + localOffset)) {
hunk.offset = offset += localOffset;
break;
}
}
if (localOffset === undefined) {
return false;
}
// Set lower text limit to end of the current hunk, so next ones don't try
// to fit over already patched text
minLine = hunk.offset + hunk.oldStart + hunk.oldLines;
}
// Apply patch hunks
var diffOffset = 0;
for (var _i = 0; _i < hunks.length; _i++) {
var _hunk = hunks[_i],
_toPos = _hunk.oldStart + _hunk.offset + diffOffset - 1;
diffOffset += _hunk.newLines - _hunk.oldLines;
for (var j = 0; j < _hunk.lines.length; j++) {
var line = _hunk.lines[j],
operation = line.length > 0 ? line[0] : ' ',
content = line.length > 0 ? line.substr(1) : line,
delimiter = _hunk.linedelimiters[j];
if (operation === ' ') {
_toPos++;
} else if (operation === '-') {
lines.splice(_toPos, 1);
delimiters.splice(_toPos, 1);
/* istanbul ignore else */
} else if (operation === '+') {
lines.splice(_toPos, 0, content);
delimiters.splice(_toPos, 0, delimiter);
_toPos++;
} else if (operation === '\\') {
var previousOperation = _hunk.lines[j - 1] ? _hunk.lines[j - 1][0] : null;
if (previousOperation === '+') {
removeEOFNL = true;
} else if (previousOperation === '-') {
addEOFNL = true;
}
}
}
}
// Handle EOFNL insertion/removal
if (removeEOFNL) {
while (!lines[lines.length - 1]) {
lines.pop();
delimiters.pop();
}
} else if (addEOFNL) {
lines.push('');
delimiters.push('\n');
}
for (var _k = 0; _k < lines.length - 1; _k++) {
lines[_k] = lines[_k] + delimiters[_k];
}
return lines.join('');
}
// Wrapper that supports multiple file patches via callbacks.
function applyPatches(uniDiff, options) {
if (typeof uniDiff === 'string') {
uniDiff = parsePatch(uniDiff);
}
var currentIndex = 0;
function processIndex() {
var index = uniDiff[currentIndex++];
if (!index) {
return options.complete();
}
options.loadFile(index, function (err, data) {
if (err) {
return options.complete(err);
}
var updatedContent = applyPatch(data, index, options);
options.patched(index, updatedContent, function (err) {
if (err) {
return options.complete(err);
}
processIndex();
});
});
}
processIndex();
}
function structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
if (!options) {
options = {};
}
if (typeof options.context === 'undefined') {
options.context = 4;
}
var diff = diffLines(oldStr, newStr, options);
diff.push({
value: '',
lines: []
}); // Append an empty value to make cleanup easier
function contextLines(lines) {
return lines.map(function (entry) {
return ' ' + entry;
});
}
var hunks = [];
var oldRangeStart = 0,
newRangeStart = 0,
curRange = [],
oldLine = 1,
newLine = 1;
var _loop = function _loop(i) {
var current = diff[i],
lines = current.lines || current.value.replace(/\n$/, '').split('\n');
current.lines = lines;
if (current.added || current.removed) {
var _curRange;
// If we have previous context, start with that
if (!oldRangeStart) {
var prev = diff[i - 1];
oldRangeStart = oldLine;
newRangeStart = newLine;
if (prev) {
curRange = options.context > 0 ? contextLines(prev.lines.slice(-options.context)) : [];
oldRangeStart -= curRange.length;
newRangeStart -= curRange.length;
}
}
// Output our changes
(_curRange = curRange).push.apply(_curRange, _toConsumableArray(lines.map(function (entry) {
return (current.added ? '+' : '-') + entry;
})));
// Track the updated file position
if (current.added) {
newLine += lines.length;
} else {
oldLine += lines.length;
}
} else {
// Identical context lines. Track line changes
if (oldRangeStart) {
// Close out any changes that have been output (or join overlapping)
if (lines.length <= options.context * 2 && i < diff.length - 2) {
var _curRange2;
// Overlapping
(_curRange2 = curRange).push.apply(_curRange2, _toConsumableArray(contextLines(lines)));
} else {
var _curRange3;
// end the range and output
var contextSize = Math.min(lines.length, options.context);
(_curRange3 = curRange).push.apply(_curRange3, _toConsumableArray(contextLines(lines.slice(0, contextSize))));
var hunk = {
oldStart: oldRangeStart,
oldLines: oldLine - oldRangeStart + contextSize,
newStart: newRangeStart,
newLines: newLine - newRangeStart + contextSize,
lines: curRange
};
if (i >= diff.length - 2 && lines.length <= options.context) {
// EOF is inside this hunk
var oldEOFNewline = /\n$/.test(oldStr);
var newEOFNewline = /\n$/.test(newStr);
var noNlBeforeAdds = lines.length == 0 && curRange.length > hunk.oldLines;
if (!oldEOFNewline && noNlBeforeAdds && oldStr.length > 0) {
// special case: old has no eol and no trailing context; no-nl can end up before adds
// however, if the old file is empty, do not output the no-nl line
curRange.splice(hunk.oldLines, 0, '\\ No newline at end of file');
}
if (!oldEOFNewline && !noNlBeforeAdds || !newEOFNewline) {
curRange.push('\\ No newline at end of file');
}
}
hunks.push(hunk);
oldRangeStart = 0;
newRangeStart = 0;
curRange = [];
}
}
oldLine += lines.length;
newLine += lines.length;
}
};
for (var i = 0; i < diff.length; i++) {
_loop(i);
}
return {
oldFileName: oldFileName,
newFileName: newFileName,
oldHeader: oldHeader,
newHeader: newHeader,
hunks: hunks
};
}
function formatPatch(diff) {
var ret = [];
if (diff.oldFileName == diff.newFileName) {
ret.push('Index: ' + diff.oldFileName);
}
ret.push('===================================================================');
ret.push('--- ' + diff.oldFileName + (typeof diff.oldHeader === 'undefined' ? '' : '\t' + diff.oldHeader));
ret.push('+++ ' + diff.newFileName + (typeof diff.newHeader === 'undefined' ? '' : '\t' + diff.newHeader));
for (var i = 0; i < diff.hunks.length; i++) {
var hunk = diff.hunks[i];
// Unified Diff Format quirk: If the chunk size is 0,
// the first number is one lower than one would expect.
// https://www.artima.com/weblogs/viewpost.jsp?thread=164293
if (hunk.oldLines === 0) {
hunk.oldStart -= 1;
}
if (hunk.newLines === 0) {
hunk.newStart -= 1;
}
ret.push('@@ -' + hunk.oldStart + ',' + hunk.oldLines + ' +' + hunk.newStart + ',' + hunk.newLines + ' @@');
ret.push.apply(ret, hunk.lines);
}
return ret.join('\n') + '\n';
}
function createTwoFilesPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options) {
return formatPatch(structuredPatch(oldFileName, newFileName, oldStr, newStr, oldHeader, newHeader, options));
}
function createPatch(fileName, oldStr, newStr, oldHeader, newHeader, options) {
return createTwoFilesPatch(fileName, fileName, oldStr, newStr, oldHeader, newHeader, options);
}
function arrayEqual(a, b) {
if (a.length !== b.length) {
return false;
}
return arrayStartsWith(a, b);
}
function arrayStartsWith(array, start) {
if (start.length > array.length) {
return false;
}
for (var i = 0; i < start.length; i++) {
if (start[i] !== array[i]) {
return false;
}
}
return true;
}
function calcLineCount(hunk) {
var _calcOldNewLineCount = calcOldNewLineCount(hunk.lines),
oldLines = _calcOldNewLineCount.oldLines,
newLines = _calcOldNewLineCount.newLines;
if (oldLines !== undefined) {
hunk.oldLines = oldLines;
} else {
delete hunk.oldLines;
}
if (newLines !== undefined) {
hunk.newLines = newLines;
} else {
delete hunk.newLines;
}
}
function merge(mine, theirs, base) {
mine = loadPatch(mine, base);
theirs = loadPatch(theirs, base);
var ret = {};
// For index we just let it pass through as it doesn't have any necessary meaning.
// Leaving sanity checks on this to the API consumer that may know more about the
// meaning in their own context.
if (mine.index || theirs.index) {
ret.index = mine.index || theirs.index;
}
if (mine.newFileName || theirs.newFileName) {
if (!fileNameChanged(mine)) {
// No header or no change in ours, use theirs (and ours if theirs does not exist)
ret.oldFileName = theirs.oldFileName || mine.oldFileName;
ret.newFileName = theirs.newFileName || mine.newFileName;
ret.oldHeader = theirs.oldHeader || mine.oldHeader;
ret.newHeader = theirs.newHeader || mine.newHeader;
} else if (!fileNameChanged(theirs)) {
// No header or no change in theirs, use ours
ret.oldFileName = mine.oldFileName;
ret.newFileName = mine.newFileName;
ret.oldHeader = mine.oldHeader;
ret.newHeader = mine.newHeader;
} else {
// Both changed... figure it out
ret.oldFileName = selectField(ret, mine.oldFileName, theirs.oldFileName);
ret.newFileName = selectField(ret, mine.newFileName, theirs.newFileName);
ret.oldHeader = selectField(ret, mine.oldHeader, theirs.oldHeader);
ret.newHeader = selectField(ret, mine.newHeader, theirs.newHeader);
}
}
ret.hunks = [];
var mineIndex = 0,
theirsIndex = 0,
mineOffset = 0,
theirsOffset = 0;
while (mineIndex < mine.hunks.length || theirsIndex < theirs.hunks.length) {
var mineCurrent = mine.hunks[mineIndex] || {
oldStart: Infinity
},
theirsCurrent = theirs.hunks[theirsIndex] || {
oldStart: Infinity
};
if (hunkBefore(mineCurrent, theirsCurrent)) {
// This patch does not overlap with any of the others, yay.
ret.hunks.push(cloneHunk(mineCurrent, mineOffset));
mineIndex++;
theirsOffset += mineCurrent.newLines - mineCurrent.oldLines;
} else if (hunkBefore(theirsCurrent, mineCurrent)) {
// This patch does not overlap with any of the others, yay.
ret.hunks.push(cloneHunk(theirsCurrent, theirsOffset));
theirsIndex++;
mineOffset += theirsCurrent.newLines - theirsCurrent.oldLines;
} else {
// Overlap, merge as best we can
var mergedHunk = {
oldStart: Math.min(mineCurrent.oldStart, theirsCurrent.oldStart),
oldLines: 0,
newStart: Math.min(mineCurrent.newStart + mineOffset, theirsCurrent.oldStart + theirsOffset),
newLines: 0,
lines: []
};
mergeLines(mergedHunk, mineCurrent.oldStart, mineCurrent.lines, theirsCurrent.oldStart, theirsCurrent.lines);
theirsIndex++;
mineIndex++;
ret.hunks.push(mergedHunk);
}
}
return ret;
}
function loadPatch(param, base) {
if (typeof param === 'string') {
if (/^@@/m.test(param) || /^Index:/m.test(param)) {
return parsePatch(param)[0];
}
if (!base) {
throw new Error('Must provide a base reference or pass in a patch');
}
return structuredPatch(undefined, undefined, base, param);
}
return param;
}
function fileNameChanged(patch) {
return patch.newFileName && patch.newFileName !== patch.oldFileName;
}
function selectField(index, mine, theirs) {
if (mine === theirs) {
return mine;
} else {
index.conflict = true;
return {
mine: mine,
theirs: theirs
};
}
}
function hunkBefore(test, check) {
return test.oldStart < check.oldStart && test.oldStart + test.oldLines < check.oldStart;
}
function cloneHunk(hunk, offset) {
return {
oldStart: hunk.oldStart,
oldLines: hunk.oldLines,
newStart: hunk.newStart + offset,
newLines: hunk.newLines,
lines: hunk.lines
};
}
function mergeLines(hunk, mineOffset, mineLines, theirOffset, theirLines) {
// This will generally result in a conflicted hunk, but there are cases where the context
// is the only overlap where we can successfully merge the content here.
var mine = {
offset: mineOffset,
lines: mineLines,
index: 0
},
their = {
offset: theirOffset,
lines: theirLines,
index: 0
};
// Handle any leading content
insertLeading(hunk, mine, their);
insertLeading(hunk, their, mine);
// Now in the overlap content. Scan through and select the best changes from each.
while (mine.index < mine.lines.length && their.index < their.lines.length) {
var mineCurrent = mine.lines[mine.index],
theirCurrent = their.lines[their.index];
if ((mineCurrent[0] === '-' || mineCurrent[0] === '+') && (theirCurrent[0] === '-' || theirCurrent[0] === '+')) {
// Both modified ...
mutualChange(hunk, mine, their);
} else if (mineCurrent[0] === '+' && theirCurrent[0] === ' ') {
var _hunk$lines;
// Mine inserted
(_hunk$lines = hunk.lines).push.apply(_hunk$lines, _toConsumableArray(collectChange(mine)));
} else if (theirCurrent[0] === '+' && mineCurrent[0] === ' ') {
var _hunk$lines2;
// Theirs inserted
(_hunk$lines2 = hunk.lines).push.apply(_hunk$lines2, _toConsumableArray(collectChange(their)));
} else if (mineCurrent[0] === '-' && theirCurrent[0] === ' ') {
// Mine removed or edited
removal(hunk, mine, their);
} else if (theirCurrent[0] === '-' && mineCurrent[0] === ' ') {
// Their removed or edited
removal(hunk, their, mine, true);
} else if (mineCurrent === theirCurrent) {
// Context identity
hunk.lines.push(mineCurrent);
mine.index++;
their.index++;
} else {
// Context mismatch
conflict(hunk, collectChange(mine), collectChange(their));
}
}
// Now push anything that may be remaining
insertTrailing(hunk, mine);
insertTrailing(hunk, their);
calcLineCount(hunk);
}
function mutualChange(hunk, mine, their) {
var myChanges = collectChange(mine),
theirChanges = collectChange(their);
if (allRemoves(myChanges) && allRemoves(theirChanges)) {
// Special case for remove changes that are supersets of one another
if (arrayStartsWith(myChanges, theirChanges) && skipRemoveSuperset(their, myChanges, myChanges.length - theirChanges.length)) {
var _hunk$lines3;
(_hunk$lines3 = hunk.lines).push.apply(_hunk$lines3, _toConsumableArray(myChanges));
return;
} else if (arrayStartsWith(theirChanges, myChanges) && skipRemoveSuperset(mine, theirChanges, theirChanges.length - myChanges.length)) {
var _hunk$lines4;
(_hunk$lines4 = hunk.lines).push.apply(_hunk$lines4, _toConsumableArray(theirChanges));
return;
}
} else if (arrayEqual(myChanges, theirChanges)) {
var _hunk$lines5;
(_hunk$lines5 = hunk.lines).push.apply(_hunk$lines5, _toConsumableArray(myChanges));
return;
}
conflict(hunk, myChanges, theirChanges);
}
function removal(hunk, mine, their, swap) {
var myChanges = collectChange(mine),
theirChanges = collectContext(their, myChanges);
if (theirChanges.merged) {
var _hunk$lines6;
(_hunk$lines6 = hunk.lines).push.apply(_hunk$lines6, _toConsumableArray(theirChanges.merged));
} else {
conflict(hunk, swap ? theirChanges : myChanges, swap ? myChanges : theirChanges);
}
}
function conflict(hunk, mine, their) {
hunk.conflict = true;
hunk.lines.push({
conflict: true,
mine: mine,
theirs: their
});
}
function insertLeading(hunk, insert, their) {
while (insert.offset < their.offset && insert.index < insert.lines.length) {
var line = insert.lines[insert.index++];
hunk.lines.push(line);
insert.offset++;
}
}
function insertTrailing(hunk, insert) {
while (insert.index < insert.lines.length) {
var line = insert.lines[insert.index++];
hunk.lines.push(line);
}
}
function collectChange(state) {
var ret = [],
operation = state.lines[state.index][0];
while (state.index < state.lines.length) {
var line = state.lines[state.index];
// Group additions that are immediately after subtractions and treat them as one "atomic" modify change.
if (operation === '-' && line[0] === '+') {
operation = '+';
}
if (operation === line[0]) {
ret.push(line);
state.index++;
} else {
break;
}
}
return ret;
}
function collectContext(state, matchChanges) {
var changes = [],
merged = [],
matchIndex = 0,
contextChanges = false,
conflicted = false;
while (matchIndex < matchChanges.length && state.index < state.lines.length) {
var change = state.lines[state.index],
match = matchChanges[matchIndex];
// Once we've hit our add, then we are done
if (match[0] === '+') {
break;
}
contextChanges = contextChanges || change[0] !== ' ';
merged.push(match);
matchIndex++;
// Consume any additions in the other block as a conflict to attempt
// to pull in the remaining context after this
if (change[0] === '+') {
conflicted = true;
while (change[0] === '+') {
changes.push(change);
change = state.lines[++state.index];
}
}
if (match.substr(1) === change.substr(1)) {
changes.push(change);
state.index++;
} else {
conflicted = true;
}
}
if ((matchChanges[matchIndex] || '')[0] === '+' && contextChanges) {
conflicted = true;
}
if (conflicted) {
return changes;
}
while (matchIndex < matchChanges.length) {
merged.push(matchChanges[matchIndex++]);
}
return {
merged: merged,
changes: changes
};
}
function allRemoves(changes) {
return changes.reduce(function (prev, change) {
return prev && change[0] === '-';
}, true);
}
function skipRemoveSuperset(state, removeChanges, delta) {
for (var i = 0; i < delta; i++) {
var changeContent = removeChanges[removeChanges.length - delta + i].substr(1);
if (state.lines[state.index + i] !== ' ' + changeContent) {
return false;
}
}
state.index += delta;
return true;
}
function calcOldNewLineCount(lines) {
var oldLines = 0;
var newLines = 0;
lines.forEach(function (line) {
if (typeof line !== 'string') {
var myCount = calcOldNewLineCount(line.mine);
var theirCount = calcOldNewLineCount(line.theirs);
if (oldLines !== undefined) {
if (myCount.oldLines === theirCount.oldLines) {
oldLines += myCount.oldLines;
} else {
oldLines = undefined;
}
}
if (newLines !== undefined) {
if (myCount.newLines === theirCount.newLines) {
newLines += myCount.newLines;
} else {
newLines = undefined;
}
}
} else {
if (newLines !== undefined && (line[0] === '+' || line[0] === ' ')) {
newLines++;
}
if (oldLines !== undefined && (line[0] === '-' || line[0] === ' ')) {
oldLines++;
}
}
});
return {
oldLines: oldLines,
newLines: newLines
};
}
// See: http://code.google.com/p/google-diff-match-patch/wiki/API
function convertChangesToDMP(changes) {
var ret = [],
change,
operation;
for (var i = 0; i < changes.length; i++) {
change = changes[i];
if (change.added) {
operation = 1;
} else if (change.removed) {
operation = -1;
} else {
operation = 0;
}
ret.push([operation, change.value]);
}
return ret;
}
function convertChangesToXML(changes) {
var ret = [];
for (var i = 0; i < changes.length; i++) {
var change = changes[i];
if (change.added) {
ret.push('<ins>');
} else if (change.removed) {
ret.push('<del>');
}
ret.push(escapeHTML(change.value));
if (change.added) {
ret.push('</ins>');
} else if (change.removed) {
ret.push('</del>');
}
}
return ret.join('');
}
function escapeHTML(s) {
var n = s;
n = n.replace(/&/g, '&');
n = n.replace(/</g, '<');
n = n.replace(/>/g, '>');
n = n.replace(/"/g, '"');
return n;
}
exports.Diff = Diff;
exports.applyPatch = applyPatch;
exports.applyPatches = applyPatches;
exports.canonicalize = canonicalize;
exports.convertChangesToDMP = convertChangesToDMP;
exports.convertChangesToXML = convertChangesToXML;
exports.createPatch = createPatch;
exports.createTwoFilesPatch = createTwoFilesPatch;
exports.diffArrays = diffArrays;
exports.diffChars = diffChars;
exports.diffCss = diffCss;
exports.diffJson = diffJson;
exports.diffLines = diffLines;
exports.diffSentences = diffSentences;
exports.diffTrimmedLines = diffTrimmedLines;
exports.diffWords = diffWords;
exports.diffWordsWithSpace = diffWordsWithSpace;
exports.merge = merge;
exports.parsePatch = parsePatch;
exports.structuredPatch = structuredPatch;
Object.defineProperty(exports, '__esModule', { value: true });
}));
|