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@angular/core

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Angular - the core framework

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/** * @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 { Optional, SkipSelf, ɵɵdefineInjectable } from '../../di'; import { RuntimeError } from '../../errors'; import { DefaultKeyValueDifferFactory } from './default_keyvalue_differ'; export function defaultKeyValueDiffersFactory() { return new KeyValueDiffers([new DefaultKeyValueDifferFactory()]); } /** * A repository of different Map diffing strategies used by NgClass, NgStyle, and others. * * @publicApi */ export class KeyValueDiffers { constructor(factories) { this.factories = factories; } static create(factories, parent) { if (parent) { const copied = parent.factories.slice(); factories = factories.concat(copied); } return new KeyValueDiffers(factories); } /** * Takes an array of {@link KeyValueDifferFactory} and returns a provider used to extend the * inherited {@link KeyValueDiffers} instance with the provided factories and return a new * {@link KeyValueDiffers} instance. * * @usageNotes * ### Example * * The following example shows how to extend an existing list of factories, * which will only be applied to the injector for this component and its children. * This step is all that's required to make a new {@link KeyValueDiffer} available. * * ``` * @Component({ * viewProviders: [ * KeyValueDiffers.extend([new ImmutableMapDiffer()]) * ] * }) * ``` */ static extend(factories) { return { provide: KeyValueDiffers, useFactory: (parent) => { // if parent is null, it means that we are in the root injector and we have just overridden // the default injection mechanism for KeyValueDiffers, in such a case just assume // `defaultKeyValueDiffersFactory`. return KeyValueDiffers.create(factories, parent || defaultKeyValueDiffersFactory()); }, // Dependency technically isn't optional, but we can provide a better error message this way. deps: [[KeyValueDiffers, new SkipSelf(), new Optional()]] }; } find(kv) { const factory = this.factories.find(f => f.supports(kv)); if (factory) { return factory; } throw new RuntimeError(901 /* RuntimeErrorCode.NO_SUPPORTING_DIFFER_FACTORY */, ngDevMode && `Cannot find a differ supporting object '${kv}'`); } } /** @nocollapse */ KeyValueDiffers.ɵprov = ɵɵdefineInjectable({ token: KeyValueDiffers, providedIn: 'root', factory: defaultKeyValueDiffersFactory }); //# sourceMappingURL=data:application/json;base64,{"version":3,"file":"keyvalue_differs.js","sourceRoot":"","sources":["../../../../../../../../packages/core/src/change_detection/differs/keyvalue_differs.ts"],"names":[],"mappings":"AAAA;;;;;;GAMG;AAEH,OAAO,EAAC,QAAQ,EAAE,QAAQ,EAAkB,kBAAkB,EAAC,MAAM,UAAU,CAAC;AAChF,OAAO,EAAC,YAAY,EAAmB,MAAM,cAAc,CAAC;AAE5D,OAAO,EAAC,4BAA4B,EAAC,MAAM,2BAA2B,CAAC;AAwGvE,MAAM,UAAU,6BAA6B;IAC3C,OAAO,IAAI,eAAe,CAAC,CAAC,IAAI,4BAA4B,EAAE,CAAC,CAAC,CAAC;AACnE,CAAC;AAED;;;;GAIG;AACH,MAAM,OAAO,eAAe;IAU1B,YAAY,SAAkC;QAC5C,IAAI,CAAC,SAAS,GAAG,SAAS,CAAC;IAC7B,CAAC;IAED,MAAM,CAAC,MAAM,CAAI,SAAkC,EAAE,MAAwB;QAC3E,IAAI,MAAM,EAAE;YACV,MAAM,MAAM,GAAG,MAAM,CAAC,SAAS,CAAC,KAAK,EAAE,CAAC;YACxC,SAAS,GAAG,SAAS,CAAC,MAAM,CAAC,MAAM,CAAC,CAAC;SACtC;QACD,OAAO,IAAI,eAAe,CAAC,SAAS,CAAC,CAAC;IACxC,CAAC;IAED;;;;;;;;;;;;;;;;;;;OAmBG;IACH,MAAM,CAAC,MAAM,CAAI,SAAkC;QACjD,OAAO;YACL,OAAO,EAAE,eAAe;YACxB,UAAU,EAAE,CAAC,MAAuB,EAAE,EAAE;gBACtC,2FAA2F;gBAC3F,kFAAkF;gBAClF,mCAAmC;gBACnC,OAAO,eAAe,CAAC,MAAM,CAAC,SAAS,EAAE,MAAM,IAAI,6BAA6B,EAAE,CAAC,CAAC;YACtF,CAAC;YACD,6FAA6F;YAC7F,IAAI,EAAE,CAAC,CAAC,eAAe,EAAE,IAAI,QAAQ,EAAE,EAAE,IAAI,QAAQ,EAAE,CAAC,CAAC;SAC1D,CAAC;IACJ,CAAC;IAED,IAAI,CAAC,EAAO;QACV,MAAM,OAAO,GAAG,IAAI,CAAC,SAAS,CAAC,IAAI,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,QAAQ,CAAC,EAAE,CAAC,CAAC,CAAC;QACzD,IAAI,OAAO,EAAE;YACX,OAAO,OAAO,CAAC;SAChB;QACD,MAAM,IAAI,YAAY,0DAElB,SAAS,IAAI,2CAA2C,EAAE,GAAG,CAAC,CAAC;IACrE,CAAC;;AA/DD,kBAAkB;AACX,qBAAK,GAA6B,kBAAkB,CACvD,EAAC,KAAK,EAAE,eAAe,EAAE,UAAU,EAAE,MAAM,EAAE,OAAO,EAAE,6BAA6B,EAAC,CAAC,CAAC","sourcesContent":["/**\n * @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 {Optional, SkipSelf, StaticProvider, ɵɵdefineInjectable} from '../../di';\nimport {RuntimeError, RuntimeErrorCode} from '../../errors';\n\nimport {DefaultKeyValueDifferFactory} from './default_keyvalue_differ';\n\n\n/**\n * A differ that tracks changes made to an object over time.\n *\n * @publicApi\n */\nexport interface KeyValueDiffer<K, V> {\n  /**\n   * Compute a difference between the previous state and the new `object` state.\n   *\n   * @param object containing the new value.\n   * @returns an object describing the difference. The return value is only valid until the next\n   * `diff()` invocation.\n   */\n  diff(object: Map<K, V>): KeyValueChanges<K, V>|null;\n\n  /**\n   * Compute a difference between the previous state and the new `object` state.\n   *\n   * @param object containing the new value.\n   * @returns an object describing the difference. The return value is only valid until the next\n   * `diff()` invocation.\n   */\n  diff(object: {[key: string]: V}): KeyValueChanges<string, V>|null;\n  // TODO(TS2.1): diff<KP extends string>(this: KeyValueDiffer<KP, V>, object: Record<KP, V>):\n  // KeyValueDiffer<KP, V>;\n}\n\n/**\n * An object describing the changes in the `Map` or `{[k:string]: string}` since last time\n * `KeyValueDiffer#diff()` was invoked.\n *\n * @publicApi\n */\nexport interface KeyValueChanges<K, V> {\n  /**\n   * Iterate over all changes. `KeyValueChangeRecord` will contain information about changes\n   * to each item.\n   */\n  forEachItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over changes in the order of original Map showing where the original items\n   * have moved.\n   */\n  forEachPreviousItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over all keys for which values have changed.\n   */\n  forEachChangedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over all added items.\n   */\n  forEachAddedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n\n  /**\n   * Iterate over all removed items.\n   */\n  forEachRemovedItem(fn: (r: KeyValueChangeRecord<K, V>) => void): void;\n}\n\n/**\n * Record representing the item change information.\n *\n * @publicApi\n */\nexport interface KeyValueChangeRecord<K, V> {\n  /**\n   * Current key in the Map.\n   */\n  readonly key: K;\n\n  /**\n   * Current value for the key or `null` if removed.\n   */\n  readonly currentValue: V|null;\n\n  /**\n   * Previous value for the key or `null` if added.\n   */\n  readonly previousValue: V|null;\n}\n\n/**\n * Provides a factory for {@link KeyValueDiffer}.\n *\n * @publicApi\n */\nexport interface KeyValueDifferFactory {\n  /**\n   * Test to see if the differ knows how to diff this kind of object.\n   */\n  supports(objects: any): boolean;\n\n  /**\n   * Create a `KeyValueDiffer`.\n   */\n  create<K, V>(): KeyValueDiffer<K, V>;\n}\n\nexport function defaultKeyValueDiffersFactory() {\n  return new KeyValueDiffers([new DefaultKeyValueDifferFactory()]);\n}\n\n/**\n * A repository of different Map diffing strategies used by NgClass, NgStyle, and others.\n *\n * @publicApi\n */\nexport class KeyValueDiffers {\n  /** @nocollapse */\n  static ɵprov = /** @pureOrBreakMyCode */ ɵɵdefineInjectable(\n      {token: KeyValueDiffers, providedIn: 'root', factory: defaultKeyValueDiffersFactory});\n\n  /**\n   * @deprecated v4.0.0 - Should be private.\n   */\n  factories: KeyValueDifferFactory[];\n\n  constructor(factories: KeyValueDifferFactory[]) {\n    this.factories = factories;\n  }\n\n  static create<S>(factories: KeyValueDifferFactory[], parent?: KeyValueDiffers): KeyValueDiffers {\n    if (parent) {\n      const copied = parent.factories.slice();\n      factories = factories.concat(copied);\n    }\n    return new KeyValueDiffers(factories);\n  }\n\n  /**\n   * Takes an array of {@link KeyValueDifferFactory} and returns a provider used to extend the\n   * inherited {@link KeyValueDiffers} instance with the provided factories and return a new\n   * {@link KeyValueDiffers} instance.\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * The following example shows how to extend an existing list of factories,\n   * which will only be applied to the injector for this component and its children.\n   * This step is all that's required to make a new {@link KeyValueDiffer} available.\n   *\n   * ```\n   * @Component({\n   *   viewProviders: [\n   *     KeyValueDiffers.extend([new ImmutableMapDiffer()])\n   *   ]\n   * })\n   * ```\n   */\n  static extend<S>(factories: KeyValueDifferFactory[]): StaticProvider {\n    return {\n      provide: KeyValueDiffers,\n      useFactory: (parent: KeyValueDiffers) => {\n        // if parent is null, it means that we are in the root injector and we have just overridden\n        // the default injection mechanism for KeyValueDiffers, in such a case just assume\n        // `defaultKeyValueDiffersFactory`.\n        return KeyValueDiffers.create(factories, parent || defaultKeyValueDiffersFactory());\n      },\n      // Dependency technically isn't optional, but we can provide a better error message this way.\n      deps: [[KeyValueDiffers, new SkipSelf(), new Optional()]]\n    };\n  }\n\n  find(kv: any): KeyValueDifferFactory {\n    const factory = this.factories.find(f => f.supports(kv));\n    if (factory) {\n      return factory;\n    }\n    throw new RuntimeError(\n        RuntimeErrorCode.NO_SUPPORTING_DIFFER_FACTORY,\n        ngDevMode && `Cannot find a differ supporting object '${kv}'`);\n  }\n}\n"]}