base.js

/*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) {
    return left === right;
  },
  /*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. For this case we merge the
  // terminal into the prior string and drop the change.
  var lastComponent = components[componentLen - 1];
  if (componentLen > 1 && (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    return left === right;\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. For this case we merge the\n  // terminal into the prior string and drop the change.\n  let lastComponent = components[componentLen - 1];\n  if (componentLen > 1\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"]}