@angular/core
Version:
Angular - the core framework
48 lines • 7.44 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 { assertGreaterThan, assertNotEqual, assertNumber } from '../../util/assert';
import { NO_PARENT_INJECTOR } from '../interfaces/injector';
import { DECLARATION_VIEW, HEADER_OFFSET } from '../interfaces/view';
/// Parent Injector Utils ///////////////////////////////////////////////////////////////
export function hasParentInjector(parentLocation) {
return parentLocation !== NO_PARENT_INJECTOR;
}
export function getParentInjectorIndex(parentLocation) {
ngDevMode && assertNumber(parentLocation, 'Number expected');
ngDevMode && assertNotEqual(parentLocation, -1, 'Not a valid state.');
const parentInjectorIndex = parentLocation & 32767 /* RelativeInjectorLocationFlags.InjectorIndexMask */;
ngDevMode &&
assertGreaterThan(parentInjectorIndex, HEADER_OFFSET, 'Parent injector must be pointing past HEADER_OFFSET.');
return parentLocation & 32767 /* RelativeInjectorLocationFlags.InjectorIndexMask */;
}
export function getParentInjectorViewOffset(parentLocation) {
return parentLocation >> 16 /* RelativeInjectorLocationFlags.ViewOffsetShift */;
}
/**
* Unwraps a parent injector location number to find the view offset from the current injector,
* then walks up the declaration view tree until the view is found that contains the parent
* injector.
*
* @param location The location of the parent injector, which contains the view offset
* @param startView The LView instance from which to start walking up the view tree
* @returns The LView instance that contains the parent injector
*/
export function getParentInjectorView(location, startView) {
let viewOffset = getParentInjectorViewOffset(location);
let parentView = startView;
// For most cases, the parent injector can be found on the host node (e.g. for component
// or container), but we must keep the loop here to support the rarer case of deeply nested
// <ng-template> tags or inline views, where the parent injector might live many views
// above the child injector.
while (viewOffset > 0) {
parentView = parentView[DECLARATION_VIEW];
viewOffset--;
}
return parentView;
}
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