angular2
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Angular 2 - a web framework for modern web apps
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{\n isListLikeIterable,\n iterateListLike,\n ListWrapper,\n MapWrapper\n} from 'angular2/src/facade/collection';\n\nimport {\n int,\n isBlank,\n isPresent,\n stringify,\n getMapKey,\n looseIdentical,\n} from 'angular2/src/facade/lang';\n\nimport {NO_CHANGE, Pipe} from './pipe';\n\nexport class IterableChangesFactory {\n supports(obj):boolean {\n return IterableChanges.supportsObj(obj);\n }\n\n create(cdRef):Pipe {\n return new IterableChanges();\n }\n}\n\n/**\n * @exportedAs angular2/pipes\n */\nexport class IterableChanges extends Pipe {\n _collection;\n _length:int;\n _linkedRecords:_DuplicateMap;\n _unlinkedRecords:_DuplicateMap;\n _previousItHead:CollectionChangeRecord;\n _itHead:CollectionChangeRecord;\n _itTail:CollectionChangeRecord;\n _additionsHead:CollectionChangeRecord;\n _additionsTail:CollectionChangeRecord;\n _movesHead:CollectionChangeRecord;\n _movesTail:CollectionChangeRecord;\n _removalsHead:CollectionChangeRecord;\n _removalsTail:CollectionChangeRecord;\n\n constructor() {\n super();\n this._collection = null;\n this._length = null;\n /// Keeps track of the used records at any point in time (during & across `_check()` calls)\n this._linkedRecords = null;\n /// Keeps track of the removed records at any point in time during `_check()` calls.\n this._unlinkedRecords = null;\n\n this._previousItHead = null;\n this._itHead = null;\n this._itTail = null;\n this._additionsHead = null;\n this._additionsTail = null;\n this._movesHead = null;\n this._movesTail = null;\n this._removalsHead = null;\n this._removalsTail = null;\n }\n\n static supportsObj(obj):boolean {\n return isListLikeIterable(obj);\n }\n\n supports(obj):boolean {\n return IterableChanges.supportsObj(obj);\n }\n\n get collection() {\n return this._collection;\n }\n\n get length():int {\n return this._length;\n }\n\n forEachItem(fn:Function) {\n var record:CollectionChangeRecord;\n for (record = this._itHead; record !== null; record = record._next) {\n fn(record);\n }\n }\n\n forEachPreviousItem(fn:Function) {\n var record:CollectionChangeRecord;\n for (record = this._previousItHead; record !== null; record = record._nextPrevious) {\n fn(record);\n }\n }\n\n forEachAddedItem(fn:Function){\n var record:CollectionChangeRecord;\n for (record = this._additionsHead; record !== null; record = record._nextAdded) {\n fn(record);\n }\n }\n\n forEachMovedItem(fn:Function) {\n var record:CollectionChangeRecord;\n for (record = this._movesHead; record !== null; record = record._nextMoved) {\n fn(record);\n }\n }\n\n forEachRemovedItem(fn:Function){\n var record:CollectionChangeRecord;\n for (record = this._removalsHead; record !== null; record = record._nextRemoved) {\n fn(record);\n }\n }\n\n transform(collection){\n if (this.check(collection)) {\n return this;\n } else {\n return NO_CHANGE;\n }\n }\n\n // todo(vicb): optim for UnmodifiableListView (frozen arrays)\n check(collection):boolean {\n this._reset();\n\n var record:CollectionChangeRecord = this._itHead;\n var mayBeDirty:boolean = false;\n var index:int;\n var item;\n\n if (ListWrapper.isList(collection)) {\n var list = collection;\n this._length = collection.length;\n\n for (index = 0; index < this._length; index++) {\n item = list[index];\n if (record === null || !looseIdentical(record.item, item)) {\n record = this._mismatch(record, item, index);\n mayBeDirty = true;\n } else if (mayBeDirty) {\n // TODO(misko): can we limit this to duplicates only?\n record = this._verifyReinsertion(record, item, index);\n }\n record = record._next;\n }\n } else {\n index = 0;\n iterateListLike(collection, (item) => {\n if (record === null || !looseIdentical(record.item, item)) {\n record = this._mismatch(record, item, index);\n mayBeDirty = true;\n } else if (mayBeDirty) {\n // TODO(misko): can we limit this to duplicates only?\n record = this._verifyReinsertion(record, item, index);\n }\n record = record._next;\n index++\n });\n this._length = index;\n }\n\n this._truncate(record);\n this._collection = collection;\n return this.isDirty;\n }\n\n // CollectionChanges is considered dirty if it has any additions, moves or removals.\n get isDirty():boolean {\n return this._additionsHead !== null ||\n this._movesHead !== null ||\n this._removalsHead !== null;\n }\n\n /**\n * Reset the state of the change objects to show no changes. This means set previousKey to\n * currentKey, and clear all of the queues (additions, moves, removals).\n * Set the previousIndexes of moved and added items to their currentIndexes\n * Reset the list of additions, moves and removals\n */\n _reset() {\n if (this.isDirty) {\n var record:CollectionChangeRecord;\n var nextRecord:CollectionChangeRecord;\n\n for (record = this._previousItHead = this._itHead; record !== null; record = record._next) {\n record._nextPrevious = record._next;\n }\n\n for (record = this._additionsHead; record !== null; record = record._nextAdded) {\n record.previousIndex = record.currentIndex;\n }\n this._additionsHead = this._additionsTail = null;\n\n for (record = this._movesHead; record !== null; record = nextRecord) {\n record.previousIndex = record.currentIndex;\n nextRecord = record._nextMoved;\n }\n this._movesHead = this._movesTail = null;\n this._removalsHead = this._removalsTail = null;\n\n // todo(vicb) when assert gets supported\n // assert(!this.isDirty);\n }\n }\n\n /**\n * This is the core function which handles differences between collections.\n *\n * - `record` is the record which we saw at this position last time. If null then it is a new\n * item.\n * - `item` is the current item in the collection\n * - `index` is the position of the item in the collection\n */\n _mismatch(record:CollectionChangeRecord, item, index:int):CollectionChangeRecord {\n // The previous record after which we will append the current one.\n var previousRecord:CollectionChangeRecord;\n\n if (record === null) {\n previousRecord = this._itTail;\n } else {\n previousRecord = record._prev;\n // Remove the record from the collection since we know it does not match the item.\n this._remove(record);\n }\n\n // Attempt to see if we have seen the item before.\n record = this._linkedRecords === null ? null : this._linkedRecords.get(item, index);\n if (record !== null) {\n // We have seen this before, we need to move it forward in the collection.\n this._moveAfter(record, previousRecord, index);\n } else {\n // Never seen it, check evicted list.\n record = this._unlinkedRecords === null ? null : this._unlinkedRecords.get(item);\n if (record !== null) {\n // It is an item which we have evicted earlier: reinsert it back into the list.\n this._reinsertAfter(record, previousRecord, index);\n } else {\n // It is a new item: add it.\n record = this._addAfter(new CollectionChangeRecord(item), previousRecord, index);\n }\n }\n return record;\n }\n\n /**\n * This check is only needed if an array contains duplicates. (Short circuit of nothing dirty)\n *\n * Use case: `[a, a]` => `[b, a, a]`\n *\n * If we did not have this check then the insertion of `b` would:\n * 1) evict first `a`\n * 2) insert `b` at `0` index.\n * 3) leave `a` at index `1` as is. <-- this is wrong!\n * 3) reinsert `a` at index 2. <-- this is wrong!\n *\n * The correct behavior is:\n * 1) evict first `a`\n * 2) insert `b` at `0` index.\n * 3) reinsert `a` at index 1.\n * 3) move `a` at from `1` to `2`.\n *\n *\n * Double check that we have not evicted a duplicate item. We need to check if the item type may\n * have already been removed:\n * The insertion of b will evict the first 'a'. If we don't reinsert it now it will be reinserted\n * at the end. Which will show up as the two 'a's switching position. This is incorrect, since a\n * better way to think of it is as insert of 'b' rather then switch 'a' with 'b' and then add 'a'\n * at the end.\n */\n _verifyReinsertion(record:CollectionChangeRecord, item, index:int):CollectionChangeRecord {\n var reinsertRecord:CollectionChangeRecord = this._unlinkedRecords === null ?\n null : this._unlinkedRecords.get(item);\n if (reinsertRecord !== null) {\n record = this._reinsertAfter(reinsertRecord, record._prev, index);\n } else if (record.currentIndex != index) {\n record.currentIndex = index;\n this._addToMoves(record, index);\n }\n return record;\n }\n\n /**\n * Get rid of any excess {@link CollectionChangeRecord}s from the previous collection\n *\n * - `record` The first excess {@link CollectionChangeRecord}.\n */\n _truncate(record:CollectionChangeRecord) {\n // Anything after that needs to be removed;\n while (record !== null) {\n var nextRecord:CollectionChangeRecord = record._next;\n this._addToRemovals(this._unlink(record));\n record = nextRecord;\n }\n if (this._unlinkedRecords !== null) {\n this._unlinkedRecords.clear();\n }\n\n if (this._additionsTail !== null) {\n this._additionsTail._nextAdded = null;\n }\n if (this._movesTail !== null) {\n this._movesTail._nextMoved = null;\n }\n if (this._itTail !== null) {\n this._itTail._next = null;\n }\n if (this._removalsTail !== null) {\n this._removalsTail._nextRemoved = null;\n }\n }\n\n _reinsertAfter(record:CollectionChangeRecord, prevRecord:CollectionChangeRecord,\n index:int):CollectionChangeRecord {\n if (this._unlinkedRecords !== null) {\n this._unlinkedRecords.remove(record);\n }\n var prev = record._prevRemoved;\n var next = record._nextRemoved;\n\n if (prev === null) {\n this._removalsHead = next;\n } else {\n prev._nextRemoved = next;\n }\n if (next === null) {\n this._removalsTail = prev;\n } else {\n next._prevRemoved = prev;\n }\n\n this._insertAfter(record, prevRecord, index);\n this._addToMoves(record, index);\n return record;\n }\n\n _moveAfter(record:CollectionChangeRecord, prevRecord:CollectionChangeRecord,\n index:int):CollectionChangeRecord {\n this._unlink(record);\n this._insertAfter(record, prevRecord, index);\n this._addToMoves(record, index);\n return record;\n }\n\n _addAfter(record:CollectionChangeRecord, prevRecord:CollectionChangeRecord,\n index:int):CollectionChangeRecord {\n this._insertAfter(record, prevRecord, index);\n\n if (this._additionsTail === null) {\n // todo(vicb)\n //assert(this._additionsHead === null);\n this._additionsTail = this._additionsHead = record;\n } else {\n // todo(vicb)\n //assert(_additionsTail._nextAdded === null);\n //assert(record._nextAdded === null);\n this._additionsTail = this._additionsTail._nextAdded = record;\n }\n return record;\n }\n\n _insertAfter(record:CollectionChangeRecord, prevRecord:CollectionChangeRecord,\n index:int):CollectionChangeRecord {\n // todo(vicb)\n //assert(record != prevRecord);\n //assert(record._next === null);\n //assert(record._prev === null);\n\n var next:CollectionChangeRecord = prevRecord === null ? this._itHead :prevRecord._next;\n // todo(vicb)\n //assert(next != record);\n //assert(prevRecord != record);\n record._next = next;\n record._prev = prevRecord;\n if (next === null) {\n this._itTail = record;\n } else {\n next._prev = record;\n }\n if (prevRecord === null) {\n this._itHead = record;\n } else {\n prevRecord._next = record;\n }\n\n if (this._linkedRecords === null) {\n this._linkedRecords = new _DuplicateMap();\n }\n this._linkedRecords.put(record);\n\n record.currentIndex = index;\n return record;\n }\n\n _remove(record:CollectionChangeRecord):CollectionChangeRecord {\n return this._addToRemovals(this._unlink(record));\n }\n\n _unlink(record:CollectionChangeRecord):CollectionChangeRecord {\n if (this._linkedRecords !== null) {\n this._linkedRecords.remove(record);\n }\n\n var prev = record._prev;\n var next = record._next;\n\n // todo(vicb)\n //assert((record._prev = null) === null);\n //assert((record._next = null) === null);\n\n if (prev === null) {\n this._itHead = next;\n } else {\n prev._next = next;\n }\n if (next === null) {\n this._itTail = prev;\n } else {\n next._prev = prev;\n }\n\n return record;\n }\n\n _addToMoves(record:CollectionChangeRecord, toIndex:int):CollectionChangeRecord {\n // todo(vicb)\n //assert(record._nextMoved === null);\n\n if (record.previousIndex === toIndex) {\n return record;\n }\n\n if (this._movesTail === null) {\n // todo(vicb)\n //assert(_movesHead === null);\n this._movesTail = this._movesHead = record;\n } else {\n // todo(vicb)\n //assert(_movesTail._nextMoved === null);\n this._movesTail = this._movesTail._nextMoved = record;\n }\n\n return record;\n }\n\n _addToRemovals(record:CollectionChangeRecord):CollectionChangeRecord {\n if (this._unlinkedRecords === null) {\n this._unlinkedRecords = new _DuplicateMap();\n }\n this._unlinkedRecords.put(record);\n record.currentIndex = null;\n record._nextRemoved = null;\n\n if (this._removalsTail === null) {\n // todo(vicb)\n //assert(_removalsHead === null);\n this._removalsTail = this._removalsHead = record;\n record._prevRemoved = null;\n } else {\n // todo(vicb)\n //assert(_removalsTail._nextRemoved === null);\n //assert(record._nextRemoved === null);\n record._prevRemoved = this._removalsTail;\n this._removalsTail = this._removalsTail._nextRemoved = record;\n }\n return record;\n }\n\n toString():string {\n var record:CollectionChangeRecord;\n\n var list = [];\n for (record = this._itHead; record !== null; record = record._next) {\n ListWrapper.push(list, record);\n }\n\n var previous = [];\n for (record = this._previousItHead; record !== null; record = record._nextPrevious) {\n ListWrapper.push(previous, record);\n }\n\n var additions = [];\n for (record = this._additionsHead; record !== null; record = record._nextAdded) {\n ListWrapper.push(additions, record);\n }\n var moves = [];\n for (record = this._movesHead; record !== null; record = record._nextMoved) {\n ListWrapper.push(moves, record);\n }\n\n var removals = [];\n for (record = this._removalsHead; record !== null; record = record._nextRemoved) {\n ListWrapper.push(removals, record);\n }\n\n return \"collection: \" + list.join(', ') + \"\\n\" +\n \"previous: \" + previous.join(', ') + \"\\n\" +\n \"additions: \" + additions.join(', ') + \"\\n\" +\n \"moves: \" + moves.join(', ') + \"\\n\" +\n \"removals: \" + removals.join(', ') + \"\\n\";\n }\n}\n\n/**\n * @exportedAs angular2/pipes\n */\nexport class CollectionChangeRecord {\n currentIndex:int;\n previousIndex:int;\n item;\n\n _nextPrevious:CollectionChangeRecord;\n _prev:CollectionChangeRecord; _next:CollectionChangeRecord;\n _prevDup:CollectionChangeRecord; _nextDup:CollectionChangeRecord;\n _prevRemoved:CollectionChangeRecord; _nextRemoved:CollectionChangeRecord;\n _nextAdded:CollectionChangeRecord;\n _nextMoved:CollectionChangeRecord;\n\n constructor(item) {\n this.currentIndex = null;\n this.previousIndex = null;\n this.item = item;\n\n this._nextPrevious = null;\n this._prev = null;\n this._next = null;\n this._prevDup = null;\n this._nextDup = null;\n this._prevRemoved = null;\n this._nextRemoved = null;\n this._nextAdded = null;\n this._nextMoved = null;\n }\n\n toString():string {\n return this.previousIndex === this.currentIndex ?\n stringify(this.item) :\n stringify(this.item) + '[' + stringify(this.previousIndex) + '->' +\n stringify(this.currentIndex) + ']';\n }\n}\n\n// A linked list of CollectionChangeRecords with the same CollectionChangeRecord.item\nclass _DuplicateItemRecordList {\n _head:CollectionChangeRecord;\n _tail:CollectionChangeRecord;\n\n constructor() {\n this._head = null;\n this._tail = null;\n }\n\n /**\n * Append the record to the list of duplicates.\n *\n * Note: by design all records in the list of duplicates hold the same value in record.item.\n */\n add(record:CollectionChangeRecord) {\n if (this._head === null) {\n this._head = this._tail = record;\n record._nextDup = null;\n record._prevDup = null;\n } else {\n // todo(vicb)\n //assert(record.item == _head.item ||\n // record.item is num && record.item.isNaN && _head.item is num && _head.item.isNaN);\n this._tail._nextDup = record;\n record._prevDup = this._tail;\n record._nextDup = null;\n this._tail = record;\n }\n }\n\n // Returns a CollectionChangeRecord having CollectionChangeRecord.item == item and\n // CollectionChangeRecord.currentIndex >= afterIndex\n get(item, afterIndex:int):CollectionChangeRecord {\n var record:CollectionChangeRecord;\n for (record = this._head; record !== null; record = record._nextDup) {\n if ((afterIndex === null || afterIndex < record.currentIndex) &&\n looseIdentical(record.item, item)) {\n return record;\n }\n }\n return null;\n }\n\n /**\n * Remove one {@link CollectionChangeRecord} from the list of duplicates.\n *\n * Returns whether the list of duplicates is empty.\n */\n remove(record:CollectionChangeRecord):boolean {\n // todo(vicb)\n //assert(() {\n // // verify that the record being removed is in the list.\n // for (CollectionChangeRecord cursor = _head; cursor != null; cursor = cursor._nextDup) {\n // if (identical(cursor, record)) return true;\n // }\n // return false;\n //});\n\n var prev:CollectionChangeRecord = record._prevDup;\n var next:CollectionChangeRecord = record._nextDup;\n if (prev === null) {\n this._head = next;\n } else {\n prev._nextDup = next;\n }\n if (next === null) {\n this._tail = prev;\n } else {\n next._prevDup = prev;\n }\n return this._head === null;\n }\n}\n\nclass _DuplicateMap {\n map:Map;\n constructor() {\n this.map = MapWrapper.create();\n }\n\n put(record:CollectionChangeRecord) {\n // todo(vicb) handle corner cases\n var key = getMapKey(record.item);\n\n var duplicates = MapWrapper.get(this.map, key);\n if (!isPresent(duplicates)) {\n duplicates = new _DuplicateItemRecordList();\n MapWrapper.set(this.map, key, duplicates);\n }\n duplicates.add(record);\n }\n\n /**\n * Retrieve the `value` using key. Because the CollectionChangeRecord value maybe one which we\n * have already iterated over, we use the afterIndex to pretend it is not there.\n *\n * Use case: `[a, b, c, a, a]` if we are at index `3` which is the second `a` then asking if we\n * have any more `a`s needs to return the last `a` not the first or second.\n */\n get(value, afterIndex = null):CollectionChangeRecord {\n var key = getMapKey(value);\n\n var recordList = MapWrapper.get(this.map, key);\n return isBlank(recordList) ? null : recordList.get(value, afterIndex);\n }\n\n /**\n * Removes a {@link CollectionChangeRecord} from the list of duplicates.\n *\n * The list of duplicates also is removed from the map if it gets empty.\n */\n remove(record:CollectionChangeRecord):CollectionChangeRecord {\n var key = getMapKey(record.item);\n // todo(vicb)\n //assert(this.map.containsKey(key));\n var recordList:_DuplicateItemRecordList = MapWrapper.get(this.map, key);\n // Remove the list of duplicates when it gets empty\n if (recordList.remove(record)) {\n MapWrapper.delete(this.map, key);\n }\n return record;\n }\n\n get isEmpty():boolean {\n return MapWrapper.size(this.map) === 0;\n }\n\n clear() {\n MapWrapper.clear(this.map);\n }\n\n toString():string {\n return '_DuplicateMap(' + stringify(this.map) + ')';\n }\n}\n"]}