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/*istanbul ignore start*/ "use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports["default"] = Diff; /*istanbul ignore end*/ function Diff() {} Diff.prototype = { /*istanbul ignore start*/ /*istanbul ignore end*/ diff: function diff(oldString, newString) { /*istanbul ignore start*/ var _options$timeout; var /*istanbul ignore end*/ options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {}; var callback = options.callback; if (typeof options === 'function') { callback = options; options = {}; } this.options = options; var self = this; function done(value) { if (callback) { setTimeout(function () { callback(undefined, value); }, 0); return true; } else { return value; } } // Allow subclasses to massage the input prior to running oldString = this.castInput(oldString); newString = this.castInput(newString); oldString = this.removeEmpty(this.tokenize(oldString)); newString = this.removeEmpty(this.tokenize(newString)); var newLen = newString.length, oldLen = oldString.length; var editLength = 1; var maxEditLength = newLen + oldLen; if (options.maxEditLength) { maxEditLength = Math.min(maxEditLength, options.maxEditLength); } var maxExecutionTime = /*istanbul ignore start*/ (_options$timeout = /*istanbul ignore end*/ options.timeout) !== null && _options$timeout !== void 0 ? _options$timeout : Infinity; var abortAfterTimestamp = Date.now() + maxExecutionTime; var bestPath = [{ oldPos: -1, lastComponent: undefined }]; // Seed editLength = 0, i.e. the content starts with the same values var newPos = this.extractCommon(bestPath[0], newString, oldString, 0); if (bestPath[0].oldPos + 1 >= oldLen && newPos + 1 >= newLen) { // Identity per the equality and tokenizer return done([{ value: this.join(newString), count: newString.length }]); } // Once we hit the right edge of the edit graph on some diagonal k, we can // definitely reach the end of the edit graph in no more than k edits, so // there's no point in considering any moves to diagonal k+1 any more (from // which we're guaranteed to need at least k+1 more edits). // Similarly, once we've reached the bottom of the edit graph, there's no // point considering moves to lower diagonals. // We record this fact by setting minDiagonalToConsider and // maxDiagonalToConsider to some finite value once we've hit the edge of // the edit graph. // This optimization is not faithful to the original algorithm presented in // Myers's paper, which instead pointlessly extends D-paths off the end of // the edit graph - see page 7 of Myers's paper which notes this point // explicitly and illustrates it with a diagram. This has major performance // implications for some common scenarios. For instance, to compute a diff // where the new text simply appends d characters on the end of the // original text of length n, the true Myers algorithm will take O(n+d^2) // time while this optimization needs only O(n+d) time. var minDiagonalToConsider = -Infinity, maxDiagonalToConsider = Infinity; // Main worker method. checks all permutations of a given edit length for acceptance. function execEditLength() { for (var diagonalPath = Math.max(minDiagonalToConsider, -editLength); diagonalPath <= Math.min(maxDiagonalToConsider, editLength); diagonalPath += 2) { var basePath = /*istanbul ignore start*/ void 0 /*istanbul ignore end*/ ; var removePath = bestPath[diagonalPath - 1], addPath = bestPath[diagonalPath + 1]; if (removePath) { // No one else is going to attempt to use this value, clear it bestPath[diagonalPath - 1] = undefined; } var canAdd = false; if (addPath) { // what newPos will be after we do an insertion: var addPathNewPos = addPath.oldPos - diagonalPath; canAdd = addPath && 0 <= addPathNewPos && addPathNewPos < newLen; } var canRemove = removePath && removePath.oldPos + 1 < 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 old string is the farthest from the origin // and does not pass the bounds of the diff graph // TODO: Remove the `+ 1` here to make behavior match Myers algorithm // and prefer to order removals before insertions. if (!canRemove || canAdd && removePath.oldPos + 1 < addPath.oldPos) { basePath = self.addToPath(addPath, true, undefined, 0); } else { basePath = self.addToPath(removePath, undefined, true, 1); } newPos = self.extractCommon(basePath, newString, oldString, diagonalPath); if (basePath.oldPos + 1 >= oldLen && newPos + 1 >= newLen) { // If we have hit the end of both strings, then we are done return done(buildValues(self, basePath.lastComponent, newString, oldString, self.useLongestToken)); } else { bestPath[diagonalPath] = basePath; if (basePath.oldPos + 1 >= oldLen) { maxDiagonalToConsider = Math.min(maxDiagonalToConsider, diagonalPath - 1); } if (newPos + 1 >= newLen) { minDiagonalToConsider = Math.max(minDiagonalToConsider, diagonalPath + 1); } } } 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 || Date.now() > abortAfterTimestamp) { return callback(); } if (!execEditLength()) { exec(); } }, 0); })(); } else { while (editLength <= maxEditLength && Date.now() <= abortAfterTimestamp) { var ret = execEditLength(); if (ret) { return ret; } } } }, /*istanbul ignore start*/ /*istanbul ignore end*/ addToPath: function addToPath(path, added, removed, oldPosInc) { var last = path.lastComponent; if (last && last.added === added && last.removed === removed) { return { oldPos: path.oldPos + oldPosInc, lastComponent: { count: last.count + 1, added: added, removed: removed, previousComponent: last.previousComponent } }; } else { return { oldPos: path.oldPos + oldPosInc, lastComponent: { count: 1, added: added, removed: removed, previousComponent: last } }; } }, /*istanbul ignore start*/ /*istanbul ignore end*/ extractCommon: function extractCommon(basePath, newString, oldString, diagonalPath) { var newLen = newString.length, oldLen = oldString.length, oldPos = basePath.oldPos, newPos = oldPos - diagonalPath, commonCount = 0; while (newPos + 1 < newLen && oldPos + 1 < oldLen && this.equals(newString[newPos + 1], oldString[oldPos + 1])) { newPos++; oldPos++; commonCount++; } if (commonCount) { basePath.lastComponent = { count: commonCount, previousComponent: basePath.lastComponent }; } basePath.oldPos = oldPos; return newPos; }, /*istanbul ignore start*/ /*istanbul ignore end*/ 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(); } }, /*istanbul ignore start*/ /*istanbul ignore end*/ removeEmpty: function removeEmpty(array) { var ret = []; for (var i = 0; i < array.length; i++) { if (array[i]) { ret.push(array[i]); } } return ret; }, /*istanbul ignore start*/ /*istanbul ignore end*/ castInput: function castInput(value) { return value; }, /*istanbul ignore start*/ /*istanbul ignore end*/ tokenize: function tokenize(value) { return value.split(''); }, /*istanbul ignore start*/ /*istanbul ignore end*/ join: function join(chars) { return chars.join(''); } }; function buildValues(diff, lastComponent, newString, oldString, useLongestToken) { // First we convert our linked list of components in reverse order to an // array in the right order: var components = []; var nextComponent; while (lastComponent) { components.push(lastComponent); nextComponent = lastComponent.previousComponent; delete lastComponent.previousComponent; lastComponent = nextComponent; } components.reverse(); 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 finalComponent = components[componentLen - 1]; if (componentLen > 1 && typeof finalComponent.value === 'string' && (finalComponent.added || finalComponent.removed) && diff.equals('', finalComponent.value)) { components[componentLen - 2].value += finalComponent.value; components.pop(); } return components; } //# 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default function Diff() {}\n\nDiff.prototype = {\n  diff(oldString, newString, options = {}) {\n    let callback = options.callback;\n    if (typeof options === 'function') {\n      callback = options;\n      options = {};\n    }\n    this.options = options;\n\n    let self = this;\n\n    function done(value) {\n      if (callback) {\n        setTimeout(function() { callback(undefined, value); }, 0);\n        return true;\n      } else {\n        return value;\n      }\n    }\n\n    // Allow subclasses to massage the input prior to running\n    oldString = this.castInput(oldString);\n    newString = this.castInput(newString);\n\n    oldString = this.removeEmpty(this.tokenize(oldString));\n    newString = this.removeEmpty(this.tokenize(newString));\n\n    let newLen = newString.length, oldLen = oldString.length;\n    let editLength = 1;\n    let maxEditLength = newLen + oldLen;\n    if(options.maxEditLength) {\n      maxEditLength = Math.min(maxEditLength, options.maxEditLength);\n    }\n    const maxExecutionTime = options.timeout ?? Infinity;\n    const abortAfterTimestamp = Date.now() + maxExecutionTime;\n\n    let bestPath = [{ oldPos: -1, lastComponent: undefined }];\n\n    // Seed editLength = 0, i.e. the content starts with the same values\n    let newPos = this.extractCommon(bestPath[0], newString, oldString, 0);\n    if (bestPath[0].oldPos + 1 >= oldLen && newPos + 1 >= newLen) {\n      // Identity per the equality and tokenizer\n      return done([{value: this.join(newString), count: newString.length}]);\n    }\n\n    // Once we hit the right edge of the edit graph on some diagonal k, we can\n    // definitely reach the end of the edit graph in no more than k edits, so\n    // there's no point in considering any moves to diagonal k+1 any more (from\n    // which we're guaranteed to need at least k+1 more edits).\n    // Similarly, once we've reached the bottom of the edit graph, there's no\n    // point considering moves to lower diagonals.\n    // We record this fact by setting minDiagonalToConsider and\n    // maxDiagonalToConsider to some finite value once we've hit the edge of\n    // the edit graph.\n    // This optimization is not faithful to the original algorithm presented in\n    // Myers's paper, which instead pointlessly extends D-paths off the end of\n    // the edit graph - see page 7 of Myers's paper which notes this point\n    // explicitly and illustrates it with a diagram. This has major performance\n    // implications for some common scenarios. For instance, to compute a diff\n    // where the new text simply appends d characters on the end of the\n    // original text of length n, the true Myers algorithm will take O(n+d^2)\n    // time while this optimization needs only O(n+d) time.\n    let minDiagonalToConsider = -Infinity, maxDiagonalToConsider = Infinity;\n\n    // Main worker method. checks all permutations of a given edit length for acceptance.\n    function execEditLength() {\n      for (\n        let diagonalPath = Math.max(minDiagonalToConsider, -editLength);\n        diagonalPath <= Math.min(maxDiagonalToConsider, editLength);\n        diagonalPath += 2\n      ) {\n        let basePath;\n        let removePath = bestPath[diagonalPath - 1],\n            addPath = bestPath[diagonalPath + 1];\n        if (removePath) {\n          // No one else is going to attempt to use this value, clear it\n          bestPath[diagonalPath - 1] = undefined;\n        }\n\n        let canAdd = false;\n        if (addPath) {\n          // what newPos will be after we do an insertion:\n          const addPathNewPos = addPath.oldPos - diagonalPath;\n          canAdd = addPath && 0 <= addPathNewPos && addPathNewPos < newLen;\n        }\n\n        let canRemove = removePath && removePath.oldPos + 1 < oldLen;\n        if (!canAdd && !canRemove) {\n          // If this path is a terminal then prune\n          bestPath[diagonalPath] = undefined;\n          continue;\n        }\n\n        // Select the diagonal that we want to branch from. We select the prior\n        // path whose position in the old string is the farthest from the origin\n        // and does not pass the bounds of the diff graph\n        // TODO: Remove the `+ 1` here to make behavior match Myers algorithm\n        //       and prefer to order removals before insertions.\n        if (!canRemove || (canAdd && removePath.oldPos + 1 < addPath.oldPos)) {\n          basePath = self.addToPath(addPath, true, undefined, 0);\n        } else {\n          basePath = self.addToPath(removePath, undefined, true, 1);\n        }\n\n        newPos = self.extractCommon(basePath, newString, oldString, diagonalPath);\n\n        if (basePath.oldPos + 1 >= oldLen && newPos + 1 >= newLen) {\n          // If we have hit the end of both strings, then we are done\n          return done(buildValues(self, basePath.lastComponent, newString, oldString, self.useLongestToken));\n        } else {\n          bestPath[diagonalPath] = basePath;\n          if (basePath.oldPos + 1 >= oldLen) {\n            maxDiagonalToConsider = Math.min(maxDiagonalToConsider, diagonalPath - 1);\n          }\n          if (newPos + 1 >= newLen) {\n            minDiagonalToConsider = Math.max(minDiagonalToConsider, diagonalPath + 1);\n          }\n        }\n      }\n\n      editLength++;\n    }\n\n    // Performs the length of edit iteration. Is a bit fugly as this has to support the\n    // sync and async mode which is never fun. Loops over execEditLength until a value\n    // is produced, or until the edit length exceeds options.maxEditLength (if given),\n    // in which case it will return undefined.\n    if (callback) {\n      (function exec() {\n        setTimeout(function() {\n          if (editLength > maxEditLength || Date.now() > abortAfterTimestamp) {\n            return callback();\n          }\n\n          if (!execEditLength()) {\n            exec();\n          }\n        }, 0);\n      }());\n    } else {\n      while (editLength <= maxEditLength && Date.now() <= abortAfterTimestamp) {\n        let ret = execEditLength();\n        if (ret) {\n          return ret;\n        }\n      }\n    }\n  },\n\n  addToPath(path, added, removed, oldPosInc) {\n    let last = path.lastComponent;\n    if (last && last.added === added && last.removed === removed) {\n      return {\n        oldPos: path.oldPos + oldPosInc,\n        lastComponent: {count: last.count + 1, added: added, removed: removed, previousComponent: last.previousComponent }\n      };\n    } else {\n      return {\n        oldPos: path.oldPos + oldPosInc,\n        lastComponent: {count: 1, added: added, removed: removed, previousComponent: last }\n      };\n    }\n  },\n  extractCommon(basePath, newString, oldString, diagonalPath) {\n    let newLen = newString.length,\n        oldLen = oldString.length,\n        oldPos = basePath.oldPos,\n        newPos = oldPos - diagonalPath,\n\n        commonCount = 0;\n    while (newPos + 1 < newLen && oldPos + 1 < oldLen && this.equals(newString[newPos + 1], oldString[oldPos + 1])) {\n      newPos++;\n      oldPos++;\n      commonCount++;\n    }\n\n    if (commonCount) {\n      basePath.lastComponent = {count: commonCount, previousComponent: basePath.lastComponent};\n    }\n\n    basePath.oldPos = oldPos;\n    return newPos;\n  },\n\n  equals(left, right) {\n    if (this.options.comparator) {\n      return this.options.comparator(left, right);\n    } else {\n      return left === right\n        || (this.options.ignoreCase && left.toLowerCase() === right.toLowerCase());\n    }\n  },\n  removeEmpty(array) {\n    let ret = [];\n    for (let i = 0; i < array.length; i++) {\n      if (array[i]) {\n        ret.push(array[i]);\n      }\n    }\n    return ret;\n  },\n  castInput(value) {\n    return value;\n  },\n  tokenize(value) {\n    return value.split('');\n  },\n  join(chars) {\n    return chars.join('');\n  }\n};\n\nfunction buildValues(diff, lastComponent, newString, oldString, useLongestToken) {\n  // First we convert our linked list of components in reverse order to an\n  // array in the right order:\n  const components = [];\n  let nextComponent;\n  while (lastComponent) {\n    components.push(lastComponent);\n    nextComponent = lastComponent.previousComponent;\n    delete lastComponent.previousComponent;\n    lastComponent = nextComponent;\n  }\n  components.reverse();\n\n  let componentPos = 0,\n      componentLen = components.length,\n      newPos = 0,\n      oldPos = 0;\n\n  for (; componentPos < componentLen; componentPos++) {\n    let component = components[componentPos];\n    if (!component.removed) {\n      if (!component.added && useLongestToken) {\n        let value = newString.slice(newPos, newPos + component.count);\n        value = value.map(function(value, i) {\n          let oldValue = oldString[oldPos + i];\n          return oldValue.length > value.length ? oldValue : value;\n        });\n\n        component.value = diff.join(value);\n      } else {\n        component.value = diff.join(newString.slice(newPos, newPos + component.count));\n      }\n      newPos += component.count;\n\n      // Common case\n      if (!component.added) {\n        oldPos += component.count;\n      }\n    } else {\n      component.value = diff.join(oldString.slice(oldPos, oldPos + component.count));\n      oldPos += component.count;\n\n      // Reverse add and remove so removes are output first to match common convention\n      // The diffing algorithm is tied to add then remove output and this is the simplest\n      // route to get the desired output with minimal overhead.\n      if (componentPos && components[componentPos - 1].added) {\n        let tmp = components[componentPos - 1];\n        components[componentPos - 1] = components[componentPos];\n        components[componentPos] = tmp;\n      }\n    }\n  }\n\n  // Special case handle for when one terminal is ignored (i.e. whitespace).\n  // For this case we merge the terminal into the prior string and drop the change.\n  // This is only available for string mode.\n  let finalComponent = components[componentLen - 1];\n  if (componentLen > 1\n      && typeof finalComponent.value === 'string'\n      && (finalComponent.added || finalComponent.removed)\n      && diff.equals('', finalComponent.value)) {\n    components[componentLen - 2].value += finalComponent.value;\n    components.pop();\n  }\n\n  return components;\n}\n"]}