@angular/core
Version:
Angular - the core framework
60 lines • 6.31 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Google Inc. 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 { NO_PARENT_INJECTOR } from '../interfaces/injector';
import { DECLARATION_VIEW } from '../interfaces/view';
/// Parent Injector Utils ///////////////////////////////////////////////////////////////
/**
* @param {?} parentLocation
* @return {?}
*/
export function hasParentInjector(parentLocation) {
return parentLocation !== NO_PARENT_INJECTOR;
}
/**
* @param {?} parentLocation
* @return {?}
*/
export function getParentInjectorIndex(parentLocation) {
return ((/** @type {?} */ ((/** @type {?} */ (parentLocation))))) & 32767 /* InjectorIndexMask */;
}
/**
* @param {?} parentLocation
* @return {?}
*/
export function getParentInjectorViewOffset(parentLocation) {
return ((/** @type {?} */ ((/** @type {?} */ (parentLocation))))) >> 16 /* 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
* @return {?} The LView instance that contains the parent injector
*/
export function getParentInjectorView(location, startView) {
/** @type {?} */
let viewOffset = getParentInjectorViewOffset(location);
/** @type {?} */
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 = (/** @type {?} */ (parentView[DECLARATION_VIEW]));
viewOffset--;
}
return parentView;
}
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