| /*istanbul ignore start*/'use strict'; |
| |
| exports.__esModule = true; |
| exports['default'] = /*istanbul ignore end*/Diff; |
| function Diff() {} |
| |
| Diff.prototype = { |
| /*istanbul ignore start*/ /*istanbul ignore end*/diff: function diff(oldString, newString) { |
| /*istanbul ignore start*/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; |
| 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 = /*istanbul ignore start*/void 0 /*istanbul ignore end*/; |
| 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; |
| } |
| } |
| } |
| }, |
| /*istanbul ignore start*/ /*istanbul ignore end*/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 }); |
| } |
| }, |
| /*istanbul ignore start*/ /*istanbul ignore end*/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; |
| }, |
| /*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, 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) }; |
| } |
| //# 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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    let bestPath = [{ newPos: -1, components: [] }];\n\n    // Seed editLength = 0, i.e. the content starts with the same values\n    let oldPos = this.extractCommon(bestPath[0], newString, oldString, 0);\n    if (bestPath[0].newPos + 1 >= newLen && oldPos + 1 >= oldLen) {\n      // Identity per the equality and tokenizer\n      return done([{value: this.join(newString), count: newString.length}]);\n    }\n\n    // Main worker method. checks all permutations of a given edit length for acceptance.\n    function execEditLength() {\n      for (let diagonalPath = -1 * editLength; diagonalPath <= editLength; diagonalPath += 2) {\n        let basePath;\n        let addPath = bestPath[diagonalPath - 1],\n            removePath = bestPath[diagonalPath + 1],\n            oldPos = (removePath ? removePath.newPos : 0) - diagonalPath;\n        if (addPath) {\n          // No one else is going to attempt to use this value, clear it\n          bestPath[diagonalPath - 1] = undefined;\n        }\n\n        let canAdd = addPath && addPath.newPos + 1 < newLen,\n            canRemove = removePath && 0 <= oldPos && oldPos < 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 new string is the farthest from the origin\n        // and does not pass the bounds of the diff graph\n        if (!canAdd || (canRemove && addPath.newPos < removePath.newPos)) {\n          basePath = clonePath(removePath);\n          self.pushComponent(basePath.components, undefined, true);\n        } else {\n          basePath = addPath;   // No need to clone, we've pulled it from the list\n          basePath.newPos++;\n          self.pushComponent(basePath.components, true, undefined);\n        }\n\n        oldPos = self.extractCommon(basePath, newString, oldString, diagonalPath);\n\n        // If we have hit the end of both strings, then we are done\n        if (basePath.newPos + 1 >= newLen && oldPos + 1 >= oldLen) {\n          return done(buildValues(self, basePath.components, newString, oldString, self.useLongestToken));\n        } else {\n          // Otherwise track this path as a potential candidate and continue.\n          bestPath[diagonalPath] = basePath;\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.\n    if (callback) {\n      (function exec() {\n        setTimeout(function() {\n          // This should not happen, but we want to be safe.\n          /* istanbul ignore next */\n          if (editLength > maxEditLength) {\n            return callback();\n          }\n\n          if (!execEditLength()) {\n            exec();\n          }\n        }, 0);\n      }());\n    } else {\n      while (editLength <= maxEditLength) {\n        let ret = execEditLength();\n        if (ret) {\n          return ret;\n        }\n      }\n    }\n  },\n\n  pushComponent(components, added, removed) {\n    let last = components[components.length - 1];\n    if (last && last.added === added && last.removed === removed) {\n      // We need to clone here as the component clone operation is just\n      // as shallow array clone\n      components[components.length - 1] = {count: last.count + 1, added: added, removed: removed };\n    } else {\n      components.push({count: 1, added: added, removed: removed });\n    }\n  },\n  extractCommon(basePath, newString, oldString, diagonalPath) {\n    let newLen = newString.length,\n        oldLen = oldString.length,\n        newPos = basePath.newPos,\n        oldPos = newPos - 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.components.push({count: commonCount});\n    }\n\n    basePath.newPos = newPos;\n    return oldPos;\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, components, newString, oldString, useLongestToken) {\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 lastComponent = components[componentLen - 1];\n  if (componentLen > 1\n      && typeof lastComponent.value === 'string'\n      && (lastComponent.added || lastComponent.removed)\n      && diff.equals('', lastComponent.value)) {\n    components[componentLen - 2].value += lastComponent.value;\n    components.pop();\n  }\n\n  return components;\n}\n\nfunction clonePath(path) {\n  return { newPos: path.newPos, components: path.components.slice(0) };\n}\n"]} |