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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; if (options.maxEditLength) { maxEditLength = Math.min(maxEditLength, options.maxEditLength); } 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, or until the edit length exceeds options.maxEditLength (if given), // in which case it will return undefined. if (callback) { (function exec() { setTimeout(function () { 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; } // // 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+|$)/); }; function diffSentences(oldStr, newStr, callback) { return sentenceDiff.diff(oldStr, newStr, callback); } var cssDiff = new Diff(); cssDiff.tokenize = function (value) { return value.split(/([{}:;,]|\s+)/); }; function diffCss(oldStr, newStr, callback) { return cssDiff.diff(oldStr, newStr, callback); } function _typeof(obj) { "@babel/helpers - typeof"; if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function (obj) { return typeof obj; }; } else { _typeof = function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); } function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread(); } function _arrayWithoutHoles(arr) { if (Array.isArray(arr)) return _arrayLikeToArray(arr); } function _iterableToArray(iter) { if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter); } function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.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); if (!diff) { return; } 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; } export { Diff, applyPatch, applyPatches, canonicalize, convertChangesToDMP, convertChangesToXML, createPatch, createTwoFilesPatch, diffArrays, diffChars, diffCss, diffJson, diffLines, diffSentences, diffTrimmedLines, diffWords, diffWordsWithSpace, merge, parsePatch, structuredPatch };
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