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| System.register([], function (_export) {
'use strict';
var EDIT_LEAVE, EDIT_UPDATE, EDIT_ADD, EDIT_DELETE, arraySplice;
_export('calcSplices', calcSplices);
_export('projectArraySplices', projectArraySplices);
function isIndex(s) {
return +s === s >>> 0;
}
function toNumber(s) {
return +s;
}
function newSplice(index, removed, addedCount) {
return {
index: index,
removed: removed,
addedCount: addedCount
};
}
function ArraySplice() {}
function calcSplices(current, currentStart, currentEnd, old, oldStart, oldEnd) {
return arraySplice.calcSplices(current, currentStart, currentEnd, old, oldStart, oldEnd);
}
function intersect(start1, end1, start2, end2) {
// Disjoint
if (end1 < start2 || end2 < start1) return -1;
// Adjacent
if (end1 == start2 || end2 == start1) return 0;
// Non-zero intersect, span1 first
if (start1 < start2) {
if (end1 < end2) return end1 - start2; // Overlap
else return end2 - start2; // Contained
} else {
// Non-zero intersect, span2 first
if (end2 < end1) return end2 - start1; // Overlap
else return end1 - start1; // Contained
}
}
function mergeSplice(splices, index, removed, addedCount) {
var splice = newSplice(index, removed, addedCount);
var inserted = false;
var insertionOffset = 0;
for (var i = 0; i < splices.length; i++) {
var current = splices[i];
current.index += insertionOffset;
if (inserted) continue;
var intersectCount = intersect(splice.index, splice.index + splice.removed.length, current.index, current.index + current.addedCount);
if (intersectCount >= 0) {
// Merge the two splices
splices.splice(i, 1);
i--;
insertionOffset -= current.addedCount - current.removed.length;
splice.addedCount += current.addedCount - intersectCount;
var deleteCount = splice.removed.length + current.removed.length - intersectCount;
if (!splice.addedCount && !deleteCount) {
// merged splice is a noop. discard.
inserted = true;
} else {
var removed = current.removed;
if (splice.index < current.index) {
// some prefix of splice.removed is prepended to current.removed.
var prepend = splice.removed.slice(0, current.index - splice.index);
Array.prototype.push.apply(prepend, removed);
removed = prepend;
}
if (splice.index + splice.removed.length > current.index + current.addedCount) {
// some suffix of splice.removed is appended to current.removed.
var append = splice.removed.slice(current.index + current.addedCount - splice.index);
Array.prototype.push.apply(removed, append);
}
splice.removed = removed;
if (current.index < splice.index) {
splice.index = current.index;
}
}
} else if (splice.index < current.index) {
// Insert splice here.
inserted = true;
splices.splice(i, 0, splice);
i++;
var offset = splice.addedCount - splice.removed.length;
current.index += offset;
insertionOffset += offset;
}
}
Eif (!inserted) splices.push(splice);
}
function createInitialSplices(array, changeRecords) {
var splices = [];
for (var i = 0; i < changeRecords.length; i++) {
var record = changeRecords[i];
switch (record.type) {
case 'splice':
mergeSplice(splices, record.index, record.removed.slice(), record.addedCount);
break;
case 'add':
case 'update':
case 'delete':
if (!isIndex(record.name)) continue;
var index = toNumber(record.name);
if (index < 0) continue;
mergeSplice(splices, index, [record.oldValue], record.type === 'delete' ? 0 : 1);
break;
default:
console.error('Unexpected record type: ' + JSON.stringify(record));
break;
}
}
return splices;
}
function projectArraySplices(array, changeRecords) {
var splices = [];
createInitialSplices(array, changeRecords).forEach(function (splice) {
Iif (splice.addedCount == 1 && splice.removed.length == 1) {
if (splice.removed[0] !== array[splice.index]) splices.push(splice);
return;
};
splices = splices.concat(calcSplices(array, splice.index, splice.index + splice.addedCount, splice.removed, 0, splice.removed.length));
});
return splices;
}
return {
setters: [],
execute: function () {
EDIT_LEAVE = 0;
EDIT_UPDATE = 1;
EDIT_ADD = 2;
EDIT_DELETE = 3;
ArraySplice.prototype = {
// Note: This function is *based* on the computation of the Levenshtein
// "edit" distance. The one change is that "updates" are treated as two
// edits - not one. With Array splices, an update is really a delete
// followed by an add. By retaining this, we optimize for "keeping" the
// maximum array items in the original array. For example:
//
// 'xxxx123' -> '123yyyy'
//
// With 1-edit updates, the shortest path would be just to update all seven
// characters. With 2-edit updates, we delete 4, leave 3, and add 4. This
// leaves the substring '123' intact.
calcEditDistances: function calcEditDistances(current, currentStart, currentEnd, old, oldStart, oldEnd) {
// "Deletion" columns
var rowCount = oldEnd - oldStart + 1;
var columnCount = currentEnd - currentStart + 1;
var distances = new Array(rowCount);
var i, j, north, west;
// "Addition" rows. Initialize null column.
for (i = 0; i < rowCount; ++i) {
distances[i] = new Array(columnCount);
distances[i][0] = i;
}
// Initialize null row
for (j = 0; j < columnCount; ++j) {
distances[0][j] = j;
}
for (i = 1; i < rowCount; ++i) {
for (j = 1; j < columnCount; ++j) {
if (this.equals(current[currentStart + j - 1], old[oldStart + i - 1])) distances[i][j] = distances[i - 1][j - 1];else {
north = distances[i - 1][j] + 1;
west = distances[i][j - 1] + 1;
distances[i][j] = north < west ? north : west;
}
}
}
return distances;
},
// This starts at the final weight, and walks "backward" by finding
// the minimum previous weight recursively until the origin of the weight
// matrix.
spliceOperationsFromEditDistances: function spliceOperationsFromEditDistances(distances) {
var i = distances.length - 1;
var j = distances[0].length - 1;
var current = distances[i][j];
var edits = [];
while (i > 0 || j > 0) {
if (i == 0) {
edits.push(EDIT_ADD);
j--;
continue;
}
if (j == 0) {
edits.push(EDIT_DELETE);
i--;
continue;
}
var northWest = distances[i - 1][j - 1];
var west = distances[i - 1][j];
var north = distances[i][j - 1];
var min;
if (west < north) min = west < northWest ? west : northWest;else min = north < northWest ? north : northWest;
if (min == northWest) {
if (northWest == current) {
edits.push(EDIT_LEAVE);
} else {
edits.push(EDIT_UPDATE);
current = northWest;
}
i--;
j--;
} else if (min == west) {
edits.push(EDIT_DELETE);
i--;
current = west;
} else {
edits.push(EDIT_ADD);
j--;
current = north;
}
}
edits.reverse();
return edits;
},
/**
* Splice Projection functions:
*
* A splice map is a representation of how a previous array of items
* was transformed into a new array of items. Conceptually it is a list of
* tuples of
*
* <index, removed, addedCount>
*
* which are kept in ascending index order of. The tuple represents that at
* the |index|, |removed| sequence of items were removed, and counting forward
* from |index|, |addedCount| items were added.
*/
/**
* Lacking individual splice mutation information, the minimal set of
* splices can be synthesized given the previous state and final state of an
* array. The basic approach is to calculate the edit distance matrix and
* choose the shortest path through it.
*
* Complexity: O(l * p)
* l: The length of the current array
* p: The length of the old array
*/
calcSplices: function calcSplices(current, currentStart, currentEnd, old, oldStart, oldEnd) {
var prefixCount = 0;
var suffixCount = 0;
var minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);
Eif (currentStart == 0 && oldStart == 0) prefixCount = this.sharedPrefix(current, old, minLength);
Eif (currentEnd == current.length && oldEnd == old.length) suffixCount = this.sharedSuffix(current, old, minLength - prefixCount);
currentStart += prefixCount;
oldStart += prefixCount;
currentEnd -= suffixCount;
oldEnd -= suffixCount;
Iif (currentEnd - currentStart == 0 && oldEnd - oldStart == 0) return [];
if (currentStart == currentEnd) {
var splice = newSplice(currentStart, [], 0);
while (oldStart < oldEnd) splice.removed.push(old[oldStart++]);
return [splice];
} else Eif (oldStart == oldEnd) return [newSplice(currentStart, [], currentEnd - currentStart)];
var ops = this.spliceOperationsFromEditDistances(this.calcEditDistances(current, currentStart, currentEnd, old, oldStart, oldEnd));
var splice = undefined;
var splices = [];
var index = currentStart;
var oldIndex = oldStart;
for (var i = 0; i < ops.length; ++i) {
switch (ops[i]) {
case EDIT_LEAVE:
if (splice) {
splices.push(splice);
splice = undefined;
}
index++;
oldIndex++;
break;
case EDIT_UPDATE:
if (!splice) splice = newSplice(index, [], 0);
splice.addedCount++;
index++;
splice.removed.push(old[oldIndex]);
oldIndex++;
break;
case EDIT_ADD:
if (!splice) splice = newSplice(index, [], 0);
splice.addedCount++;
index++;
break;
case EDIT_DELETE:
if (!splice) splice = newSplice(index, [], 0);
splice.removed.push(old[oldIndex]);
oldIndex++;
break;
}
}
if (splice) {
splices.push(splice);
}
return splices;
},
sharedPrefix: function sharedPrefix(current, old, searchLength) {
for (var i = 0; i < searchLength; ++i) if (!this.equals(current[i], old[i])) return i;
return searchLength;
},
sharedSuffix: function sharedSuffix(current, old, searchLength) {
var index1 = current.length;
var index2 = old.length;
var count = 0;
while (count < searchLength && this.equals(current[--index1], old[--index2])) count++;
return count;
},
calculateSplices: function calculateSplices(current, previous) {
return this.calcSplices(current, 0, current.length, previous, 0, previous.length);
},
equals: function equals(currentValue, previousValue) {
return currentValue === previousValue;
}
};
arraySplice = new ArraySplice();
}
};
});
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Durandal Project/aurelia/binding/src/array-change-records.js","sourcesContent":["function isIndex(s) {\n  return +s === s >>> 0;\n}\n\nfunction toNumber(s) {\n  return +s;\n}\n\nfunction newSplice(index, removed, addedCount) {\n  return {\n    index: index,\n    removed: removed,\n    addedCount: addedCount\n  };\n}\n\nvar EDIT_LEAVE = 0;\nvar EDIT_UPDATE = 1;\nvar EDIT_ADD = 2;\nvar EDIT_DELETE = 3;\n\nfunction ArraySplice() {}\n\nArraySplice.prototype = {\n  // Note: This function is *based* on the computation of the Levenshtein\n  // \"edit\" distance. The one change is that \"updates\" are treated as two\n  // edits - not one. With Array splices, an update is really a delete\n  // followed by an add. By retaining this, we optimize for \"keeping\" the\n  // maximum array items in the original array. For example:\n  //\n  //   'xxxx123' -> '123yyyy'\n  //\n  // With 1-edit updates, the shortest path would be just to update all seven\n  // characters. With 2-edit updates, we delete 4, leave 3, and add 4. This\n  // leaves the substring '123' intact.\n  calcEditDistances: function(current, currentStart, currentEnd, old, oldStart, oldEnd) {\n    // \"Deletion\" columns\n    var rowCount = oldEnd - oldStart + 1;\n    var columnCount = currentEnd - currentStart + 1;\n    var distances = new Array(rowCount);\n    var i, j, north, west;\n\n    // \"Addition\" rows. Initialize null column.\n    for (i = 0; i < rowCount; ++i) {\n      distances[i] = new Array(columnCount);\n      distances[i][0] = i;\n    }\n\n    // Initialize null row\n    for (j = 0; j < columnCount; ++j){\n      distances[0][j] = j;\n    }\n\n    for (i = 1; i < rowCount; ++i) {\n      for (j = 1; j < columnCount; ++j) {\n        if (this.equals(current[currentStart + j - 1], old[oldStart + i - 1]))\n          distances[i][j] = distances[i - 1][j - 1];\n        else {\n          north = distances[i - 1][j] + 1;\n          west = distances[i][j - 1] + 1;\n          distances[i][j] = north < west ? north : west;\n        }\n      }\n    }\n\n    return distances;\n  },\n\n  // This starts at the final weight, and walks \"backward\" by finding\n  // the minimum previous weight recursively until the origin of the weight\n  // matrix.\n  spliceOperationsFromEditDistances: function(distances) {\n    var i = distances.length - 1;\n    var j = distances[0].length - 1;\n    var current = distances[i][j];\n    var edits = [];\n    while (i > 0 || j > 0) {\n      if (i == 0) {\n        edits.push(EDIT_ADD);\n        j--;\n        continue;\n      }\n      if (j == 0) {\n        edits.push(EDIT_DELETE);\n        i--;\n        continue;\n      }\n      var northWest = distances[i - 1][j - 1];\n      var west = distances[i - 1][j];\n      var north = distances[i][j - 1];\n\n      var min;\n      if (west < north)\n        min = west < northWest ? west : northWest;\n      else\n        min = north < northWest ? north : northWest;\n\n      if (min == northWest) {\n        if (northWest == current) {\n          edits.push(EDIT_LEAVE);\n        } else {\n          edits.push(EDIT_UPDATE);\n          current = northWest;\n        }\n        i--;\n        j--;\n      } else if (min == west) {\n        edits.push(EDIT_DELETE);\n        i--;\n        current = west;\n      } else {\n        edits.push(EDIT_ADD);\n        j--;\n        current = north;\n      }\n    }\n\n    edits.reverse();\n    return edits;\n  },\n\n  /**\n   * Splice Projection functions:\n   *\n   * A splice map is a representation of how a previous array of items\n   * was transformed into a new array of items. Conceptually it is a list of\n   * tuples of\n   *\n   *   <index, removed, addedCount>\n   *\n   * which are kept in ascending index order of. The tuple represents that at\n   * the |index|, |removed| sequence of items were removed, and counting forward\n   * from |index|, |addedCount| items were added.\n   */\n\n  /**\n   * Lacking individual splice mutation information, the minimal set of\n   * splices can be synthesized given the previous state and final state of an\n   * array. The basic approach is to calculate the edit distance matrix and\n   * choose the shortest path through it.\n   *\n   * Complexity: O(l * p)\n   *   l: The length of the current array\n   *   p: The length of the old array\n   */\n  calcSplices: function(current, currentStart, currentEnd, old, oldStart, oldEnd) {\n    var prefixCount = 0;\n    var suffixCount = 0;\n\n    var minLength = Math.min(currentEnd - currentStart, oldEnd - oldStart);\n    if (currentStart == 0 && oldStart == 0)\n      prefixCount = this.sharedPrefix(current, old, minLength);\n\n    if (currentEnd == current.length && oldEnd == old.length)\n      suffixCount = this.sharedSuffix(current, old, minLength - prefixCount);\n\n    currentStart += prefixCount;\n    oldStart += prefixCount;\n    currentEnd -= suffixCount;\n    oldEnd -= suffixCount;\n\n    if (currentEnd - currentStart == 0 && oldEnd - oldStart == 0)\n      return [];\n\n    if (currentStart == currentEnd) {\n      var splice = newSplice(currentStart, [], 0);\n      while (oldStart < oldEnd)\n        splice.removed.push(old[oldStart++]);\n\n      return [ splice ];\n    } else if (oldStart == oldEnd)\n      return [ newSplice(currentStart, [], currentEnd - currentStart) ];\n\n    var ops = this.spliceOperationsFromEditDistances(\n        this.calcEditDistances(current, currentStart, currentEnd,\n                               old, oldStart, oldEnd));\n\n    var splice = undefined;\n    var splices = [];\n    var index = currentStart;\n    var oldIndex = oldStart;\n    for (var i = 0; i < ops.length; ++i) {\n      switch(ops[i]) {\n        case EDIT_LEAVE:\n          if (splice) {\n            splices.push(splice);\n            splice = undefined;\n          }\n\n          index++;\n          oldIndex++;\n          break;\n        case EDIT_UPDATE:\n          if (!splice)\n            splice = newSplice(index, [], 0);\n\n          splice.addedCount++;\n          index++;\n\n          splice.removed.push(old[oldIndex]);\n          oldIndex++;\n          break;\n        case EDIT_ADD:\n          if (!splice)\n            splice = newSplice(index, [], 0);\n\n          splice.addedCount++;\n          index++;\n          break;\n        case EDIT_DELETE:\n          if (!splice)\n            splice = newSplice(index, [], 0);\n\n          splice.removed.push(old[oldIndex]);\n          oldIndex++;\n          break;\n      }\n    }\n\n    if (splice) {\n      splices.push(splice);\n    }\n    return splices;\n  },\n\n  sharedPrefix: function(current, old, searchLength) {\n    for (var i = 0; i < searchLength; ++i)\n      if (!this.equals(current[i], old[i]))\n        return i;\n    return searchLength;\n  },\n\n  sharedSuffix: function(current, old, searchLength) {\n    var index1 = current.length;\n    var index2 = old.length;\n    var count = 0;\n    while (count < searchLength && this.equals(current[--index1], old[--index2]))\n      count++;\n\n    return count;\n  },\n\n  calculateSplices: function(current, previous) {\n    return this.calcSplices(current, 0, current.length, previous, 0,\n                            previous.length);\n  },\n\n  equals: function(currentValue, previousValue) {\n    return currentValue === previousValue;\n  }\n};\n\nvar arraySplice = new ArraySplice();\n\nexport function calcSplices(current, currentStart, currentEnd, old, oldStart, oldEnd) {\n  return arraySplice.calcSplices(current, currentStart, currentEnd, old, oldStart, oldEnd);\n}\n\nfunction intersect(start1, end1, start2, end2) {\n  // Disjoint\n  if (end1 < start2 || end2 < start1)\n    return -1;\n\n  // Adjacent\n  if (end1 == start2 || end2 == start1)\n    return 0;\n\n  // Non-zero intersect, span1 first\n  if (start1 < start2) {\n    if (end1 < end2)\n      return end1 - start2; // Overlap\n    else\n      return end2 - start2; // Contained\n  } else {\n    // Non-zero intersect, span2 first\n    if (end2 < end1)\n      return end2 - start1; // Overlap\n    else\n      return end1 - start1; // Contained\n  }\n}\n\nfunction mergeSplice(splices, index, removed, addedCount) {\n  var splice = newSplice(index, removed, addedCount);\n\n  var inserted = false;\n  var insertionOffset = 0;\n\n  for (var i = 0; i < splices.length; i++) {\n    var current = splices[i];\n    current.index += insertionOffset;\n\n    if (inserted)\n      continue;\n\n    var intersectCount = intersect(splice.index,\n                                   splice.index + splice.removed.length,\n                                   current.index,\n                                   current.index + current.addedCount);\n\n    if (intersectCount >= 0) {\n      // Merge the two splices\n\n      splices.splice(i, 1);\n      i--;\n\n      insertionOffset -= current.addedCount - current.removed.length;\n\n      splice.addedCount += current.addedCount - intersectCount;\n      var deleteCount = splice.removed.length +\n                        current.removed.length - intersectCount;\n\n      if (!splice.addedCount && !deleteCount) {\n        // merged splice is a noop. discard.\n        inserted = true;\n      } else {\n        var removed = current.removed;\n\n        if (splice.index < current.index) {\n          // some prefix of splice.removed is prepended to current.removed.\n          var prepend = splice.removed.slice(0, current.index - splice.index);\n          Array.prototype.push.apply(prepend, removed);\n          removed = prepend;\n        }\n\n        if (splice.index + splice.removed.length > current.index + current.addedCount) {\n          // some suffix of splice.removed is appended to current.removed.\n          var append = splice.removed.slice(current.index + current.addedCount - splice.index);\n          Array.prototype.push.apply(removed, append);\n        }\n\n        splice.removed = removed;\n        if (current.index < splice.index) {\n          splice.index = current.index;\n        }\n      }\n    } else if (splice.index < current.index) {\n      // Insert splice here.\n\n      inserted = true;\n\n      splices.splice(i, 0, splice);\n      i++;\n\n      var offset = splice.addedCount - splice.removed.length\n      current.index += offset;\n      insertionOffset += offset;\n    }\n  }\n\n  if (!inserted)\n    splices.push(splice);\n}\n\nfunction createInitialSplices(array, changeRecords) {\n  var splices = [];\n\n  for (var i = 0; i < changeRecords.length; i++) {\n    var record = changeRecords[i];\n    switch(record.type) {\n      case 'splice':\n        mergeSplice(splices, record.index, record.removed.slice(), record.addedCount);\n        break;\n      case 'add':\n      case 'update':\n      case 'delete':\n        if (!isIndex(record.name))\n          continue;\n        var index = toNumber(record.name);\n        if (index < 0)\n          continue;\n        mergeSplice(splices, index, [record.oldValue], record.type === 'delete' ? 0 : 1);\n        break;\n      default:\n        console.error('Unexpected record type: ' + JSON.stringify(record));\n        break;\n    }\n  }\n\n  return splices;\n}\n\nexport function projectArraySplices(array, changeRecords) {\n  var splices = [];\n\n  createInitialSplices(array, changeRecords).forEach(function(splice) {\n    if (splice.addedCount == 1 && splice.removed.length == 1) {\n      if (splice.removed[0] !== array[splice.index])\n        splices.push(splice);\n\n      return\n    };\n\n    splices = splices.concat(calcSplices(array, splice.index, splice.index + splice.addedCount,\n                                         splice.removed, 0, splice.removed.length));\n  });\n\n  return splices;\n}\n"]} |