@angular/core
Version:
Angular - the core framework
255 lines • 31.4 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { RuntimeError } from '../../errors';
import { isJsObject } from '../../util/iterable';
import { stringify } from '../../util/stringify';
export class DefaultKeyValueDifferFactory {
constructor() { }
supports(obj) {
return obj instanceof Map || isJsObject(obj);
}
create() {
return new DefaultKeyValueDiffer();
}
}
export class DefaultKeyValueDiffer {
constructor() {
this._records = new Map();
this._mapHead = null;
// _appendAfter is used in the check loop
this._appendAfter = null;
this._previousMapHead = null;
this._changesHead = null;
this._changesTail = null;
this._additionsHead = null;
this._additionsTail = null;
this._removalsHead = null;
this._removalsTail = null;
}
get isDirty() {
return this._additionsHead !== null || this._changesHead !== null ||
this._removalsHead !== null;
}
forEachItem(fn) {
let record;
for (record = this._mapHead; record !== null; record = record._next) {
fn(record);
}
}
forEachPreviousItem(fn) {
let record;
for (record = this._previousMapHead; record !== null; record = record._nextPrevious) {
fn(record);
}
}
forEachChangedItem(fn) {
let record;
for (record = this._changesHead; record !== null; record = record._nextChanged) {
fn(record);
}
}
forEachAddedItem(fn) {
let record;
for (record = this._additionsHead; record !== null; record = record._nextAdded) {
fn(record);
}
}
forEachRemovedItem(fn) {
let record;
for (record = this._removalsHead; record !== null; record = record._nextRemoved) {
fn(record);
}
}
diff(map) {
if (!map) {
map = new Map();
}
else if (!(map instanceof Map || isJsObject(map))) {
throw new RuntimeError(900 /* RuntimeErrorCode.INVALID_DIFFER_INPUT */, ngDevMode &&
`Error trying to diff '${stringify(map)}'. Only maps and objects are allowed`);
}
return this.check(map) ? this : null;
}
onDestroy() { }
/**
* Check the current state of the map vs the previous.
* The algorithm is optimised for when the keys do no change.
*/
check(map) {
this._reset();
let insertBefore = this._mapHead;
this._appendAfter = null;
this._forEach(map, (value, key) => {
if (insertBefore && insertBefore.key === key) {
this._maybeAddToChanges(insertBefore, value);
this._appendAfter = insertBefore;
insertBefore = insertBefore._next;
}
else {
const record = this._getOrCreateRecordForKey(key, value);
insertBefore = this._insertBeforeOrAppend(insertBefore, record);
}
});
// Items remaining at the end of the list have been deleted
if (insertBefore) {
if (insertBefore._prev) {
insertBefore._prev._next = null;
}
this._removalsHead = insertBefore;
for (let record = insertBefore; record !== null; record = record._nextRemoved) {
if (record === this._mapHead) {
this._mapHead = null;
}
this._records.delete(record.key);
record._nextRemoved = record._next;
record.previousValue = record.currentValue;
record.currentValue = null;
record._prev = null;
record._next = null;
}
}
// Make sure tails have no next records from previous runs
if (this._changesTail)
this._changesTail._nextChanged = null;
if (this._additionsTail)
this._additionsTail._nextAdded = null;
return this.isDirty;
}
/**
* Inserts a record before `before` or append at the end of the list when `before` is null.
*
* Notes:
* - This method appends at `this._appendAfter`,
* - This method updates `this._appendAfter`,
* - The return value is the new value for the insertion pointer.
*/
_insertBeforeOrAppend(before, record) {
if (before) {
const prev = before._prev;
record._next = before;
record._prev = prev;
before._prev = record;
if (prev) {
prev._next = record;
}
if (before === this._mapHead) {
this._mapHead = record;
}
this._appendAfter = before;
return before;
}
if (this._appendAfter) {
this._appendAfter._next = record;
record._prev = this._appendAfter;
}
else {
this._mapHead = record;
}
this._appendAfter = record;
return null;
}
_getOrCreateRecordForKey(key, value) {
if (this._records.has(key)) {
const record = this._records.get(key);
this._maybeAddToChanges(record, value);
const prev = record._prev;
const next = record._next;
if (prev) {
prev._next = next;
}
if (next) {
next._prev = prev;
}
record._next = null;
record._prev = null;
return record;
}
const record = new KeyValueChangeRecord_(key);
this._records.set(key, record);
record.currentValue = value;
this._addToAdditions(record);
return record;
}
/** @internal */
_reset() {
if (this.isDirty) {
let record;
// let `_previousMapHead` contain the state of the map before the changes
this._previousMapHead = this._mapHead;
for (record = this._previousMapHead; record !== null; record = record._next) {
record._nextPrevious = record._next;
}
// Update `record.previousValue` with the value of the item before the changes
// We need to update all changed items (that's those which have been added and changed)
for (record = this._changesHead; record !== null; record = record._nextChanged) {
record.previousValue = record.currentValue;
}
for (record = this._additionsHead; record != null; record = record._nextAdded) {
record.previousValue = record.currentValue;
}
this._changesHead = this._changesTail = null;
this._additionsHead = this._additionsTail = null;
this._removalsHead = null;
}
}
// Add the record or a given key to the list of changes only when the value has actually changed
_maybeAddToChanges(record, newValue) {
if (!Object.is(newValue, record.currentValue)) {
record.previousValue = record.currentValue;
record.currentValue = newValue;
this._addToChanges(record);
}
}
_addToAdditions(record) {
if (this._additionsHead === null) {
this._additionsHead = this._additionsTail = record;
}
else {
this._additionsTail._nextAdded = record;
this._additionsTail = record;
}
}
_addToChanges(record) {
if (this._changesHead === null) {
this._changesHead = this._changesTail = record;
}
else {
this._changesTail._nextChanged = record;
this._changesTail = record;
}
}
/** @internal */
_forEach(obj, fn) {
if (obj instanceof Map) {
obj.forEach(fn);
}
else {
Object.keys(obj).forEach(k => fn(obj[k], k));
}
}
}
class KeyValueChangeRecord_ {
constructor(key) {
this.key = key;
this.previousValue = null;
this.currentValue = null;
/** @internal */
this._nextPrevious = null;
/** @internal */
this._next = null;
/** @internal */
this._prev = null;
/** @internal */
this._nextAdded = null;
/** @internal */
this._nextRemoved = null;
/** @internal */
this._nextChanged = null;
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {RuntimeError, RuntimeErrorCode} from '../../errors';\nimport {isJsObject} from '../../util/iterable';\nimport {stringify} from '../../util/stringify';\n\nimport {KeyValueChangeRecord, KeyValueChanges, KeyValueDiffer, KeyValueDifferFactory} from './keyvalue_differs';\n\n\nexport class DefaultKeyValueDifferFactory<K, V> implements KeyValueDifferFactory {\n  constructor() {}\n  supports(obj: any): boolean {\n    return obj instanceof Map || isJsObject(obj);\n  }\n\n  create<K, V>(): KeyValueDiffer<K, V> {\n    return new DefaultKeyValueDiffer<K, V>();\n  }\n}\n\nexport class DefaultKeyValueDiffer<K, V> implements KeyValueDiffer<K, V>, KeyValueChanges<K, V> {\n  private _records = new Map<K, KeyValueChangeRecord_<K, V>>();\n  private _mapHead: KeyValueChangeRecord_<K, V>|null = null;\n  // _appendAfter is used in the check loop\n  private _appendAfter: KeyValueChangeRecord_<K, V>|null = null;\n  private _previousMapHead: KeyValueChangeRecord_<K, V>|null = null;\n  private _changesHead: KeyValueChangeRecord_<K, V>|null = null;\n  private _changesTail: KeyValueChangeRecord_<K, V>|null = null;\n  private _additionsHead: KeyValueChangeRecord_<K, V>|null = null;\n  private _additionsTail: KeyValueChangeRecord_<K, V>|null = null;\n  private _removalsHead: KeyValueChangeRecord_<K, V>|null = null;\n  private _removalsTail: KeyValueChangeRecord_<K, V>|null = null;\n\n  get isDirty(): boolean {\n    return this._additionsHead !== null || this._changesHead !== null ||\n        this._removalsHead !== null;\n  }\n\n  forEachItem(fn: (r: KeyValueChangeRecord<K, V>) => void) {\n    let record: KeyValueChangeRecord_<K, V>|null;\n    for (record = this._mapHead; record !== null; record = record._next) {\n      fn(record);\n    }\n  }\n\n  forEachPreviousItem(fn: (r: KeyValueChangeRecord<K, V>) => void) {\n    let record: KeyValueChangeRecord_<K, V>|null;\n    for (record = this._previousMapHead; record !== null; record = record._nextPrevious) {\n      fn(record);\n    }\n  }\n\n  forEachChangedItem(fn: (r: KeyValueChangeRecord<K, V>) => void) {\n    let record: KeyValueChangeRecord_<K, V>|null;\n    for (record = this._changesHead; record !== null; record = record._nextChanged) {\n      fn(record);\n    }\n  }\n\n  forEachAddedItem(fn: (r: KeyValueChangeRecord<K, V>) => void) {\n    let record: KeyValueChangeRecord_<K, V>|null;\n    for (record = this._additionsHead; record !== null; record = record._nextAdded) {\n      fn(record);\n    }\n  }\n\n  forEachRemovedItem(fn: (r: KeyValueChangeRecord<K, V>) => void) {\n    let record: KeyValueChangeRecord_<K, V>|null;\n    for (record = this._removalsHead; record !== null; record = record._nextRemoved) {\n      fn(record);\n    }\n  }\n\n  diff(map?: Map<any, any>|{[k: string]: any}|null): any {\n    if (!map) {\n      map = new Map();\n    } else if (!(map instanceof Map || isJsObject(map))) {\n      throw new RuntimeError(\n          RuntimeErrorCode.INVALID_DIFFER_INPUT,\n          ngDevMode &&\n              `Error trying to diff '${stringify(map)}'. Only maps and objects are allowed`);\n    }\n\n    return this.check(map) ? this : null;\n  }\n\n  onDestroy() {}\n\n  /**\n   * Check the current state of the map vs the previous.\n   * The algorithm is optimised for when the keys do no change.\n   */\n  check(map: Map<any, any>|{[k: string]: any}): boolean {\n    this._reset();\n\n    let insertBefore = this._mapHead;\n    this._appendAfter = null;\n\n    this._forEach(map, (value: any, key: any) => {\n      if (insertBefore && insertBefore.key === key) {\n        this._maybeAddToChanges(insertBefore, value);\n        this._appendAfter = insertBefore;\n        insertBefore = insertBefore._next;\n      } else {\n        const record = this._getOrCreateRecordForKey(key, value);\n        insertBefore = this._insertBeforeOrAppend(insertBefore, record);\n      }\n    });\n\n    // Items remaining at the end of the list have been deleted\n    if (insertBefore) {\n      if (insertBefore._prev) {\n        insertBefore._prev._next = null;\n      }\n\n      this._removalsHead = insertBefore;\n\n      for (let record: KeyValueChangeRecord_<K, V>|null = insertBefore; record !== null;\n           record = record._nextRemoved) {\n        if (record === this._mapHead) {\n          this._mapHead = null;\n        }\n        this._records.delete(record.key);\n        record._nextRemoved = record._next;\n        record.previousValue = record.currentValue;\n        record.currentValue = null;\n        record._prev = null;\n        record._next = null;\n      }\n    }\n\n    // Make sure tails have no next records from previous runs\n    if (this._changesTail) this._changesTail._nextChanged = null;\n    if (this._additionsTail) this._additionsTail._nextAdded = null;\n\n    return this.isDirty;\n  }\n\n  /**\n   * Inserts a record before `before` or append at the end of the list when `before` is null.\n   *\n   * Notes:\n   * - This method appends at `this._appendAfter`,\n   * - This method updates `this._appendAfter`,\n   * - The return value is the new value for the insertion pointer.\n   */\n  private _insertBeforeOrAppend(\n      before: KeyValueChangeRecord_<K, V>|null,\n      record: KeyValueChangeRecord_<K, V>): KeyValueChangeRecord_<K, V>|null {\n    if (before) {\n      const prev = before._prev;\n      record._next = before;\n      record._prev = prev;\n      before._prev = record;\n      if (prev) {\n        prev._next = record;\n      }\n      if (before === this._mapHead) {\n        this._mapHead = record;\n      }\n\n      this._appendAfter = before;\n      return before;\n    }\n\n    if (this._appendAfter) {\n      this._appendAfter._next = record;\n      record._prev = this._appendAfter;\n    } else {\n      this._mapHead = record;\n    }\n\n    this._appendAfter = record;\n    return null;\n  }\n\n  private _getOrCreateRecordForKey(key: K, value: V): KeyValueChangeRecord_<K, V> {\n    if (this._records.has(key)) {\n      const record = this._records.get(key)!;\n      this._maybeAddToChanges(record, value);\n      const prev = record._prev;\n      const next = record._next;\n      if (prev) {\n        prev._next = next;\n      }\n      if (next) {\n        next._prev = prev;\n      }\n      record._next = null;\n      record._prev = null;\n\n      return record;\n    }\n\n    const record = new KeyValueChangeRecord_<K, V>(key);\n    this._records.set(key, record);\n    record.currentValue = value;\n    this._addToAdditions(record);\n    return record;\n  }\n\n  /** @internal */\n  _reset() {\n    if (this.isDirty) {\n      let record: KeyValueChangeRecord_<K, V>|null;\n      // let `_previousMapHead` contain the state of the map before the changes\n      this._previousMapHead = this._mapHead;\n      for (record = this._previousMapHead; record !== null; record = record._next) {\n        record._nextPrevious = record._next;\n      }\n\n      // Update `record.previousValue` with the value of the item before the changes\n      // We need to update all changed items (that's those which have been added and changed)\n      for (record = this._changesHead; record !== null; record = record._nextChanged) {\n        record.previousValue = record.currentValue;\n      }\n      for (record = this._additionsHead; record != null; record = record._nextAdded) {\n        record.previousValue = record.currentValue;\n      }\n\n      this._changesHead = this._changesTail = null;\n      this._additionsHead = this._additionsTail = null;\n      this._removalsHead = null;\n    }\n  }\n\n  // Add the record or a given key to the list of changes only when the value has actually changed\n  private _maybeAddToChanges(record: KeyValueChangeRecord_<K, V>, newValue: any): void {\n    if (!Object.is(newValue, record.currentValue)) {\n      record.previousValue = record.currentValue;\n      record.currentValue = newValue;\n      this._addToChanges(record);\n    }\n  }\n\n  private _addToAdditions(record: KeyValueChangeRecord_<K, V>) {\n    if (this._additionsHead === null) {\n      this._additionsHead = this._additionsTail = record;\n    } else {\n      this._additionsTail!._nextAdded = record;\n      this._additionsTail = record;\n    }\n  }\n\n  private _addToChanges(record: KeyValueChangeRecord_<K, V>) {\n    if (this._changesHead === null) {\n      this._changesHead = this._changesTail = record;\n    } else {\n      this._changesTail!._nextChanged = record;\n      this._changesTail = record;\n    }\n  }\n\n  /** @internal */\n  private _forEach<K, V>(obj: Map<K, V>|{[k: string]: V}, fn: (v: V, k: any) => void) {\n    if (obj instanceof Map) {\n      obj.forEach(fn);\n    } else {\n      Object.keys(obj).forEach(k => fn(obj[k], k));\n    }\n  }\n}\n\nclass KeyValueChangeRecord_<K, V> implements KeyValueChangeRecord<K, V> {\n  previousValue: V|null = null;\n  currentValue: V|null = null;\n\n  /** @internal */\n  _nextPrevious: KeyValueChangeRecord_<K, V>|null = null;\n  /** @internal */\n  _next: KeyValueChangeRecord_<K, V>|null = null;\n  /** @internal */\n  _prev: KeyValueChangeRecord_<K, V>|null = null;\n  /** @internal */\n  _nextAdded: KeyValueChangeRecord_<K, V>|null = null;\n  /** @internal */\n  _nextRemoved: KeyValueChangeRecord_<K, V>|null = null;\n  /** @internal */\n  _nextChanged: KeyValueChangeRecord_<K, V>|null = null;\n\n  constructor(public key: K) {}\n}\n"]}