7bd18fca19
This change makes `getPreviousOrParentTNode` return `TNode|null` (rather than just `TNode`) which is more reflective of the reality. The `getPreviousOrParentTNode` can be `null` upon entering the `LView`. PR Close #38707
82 lines
2.9 KiB
TypeScript
82 lines
2.9 KiB
TypeScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {InjectFlags, InjectionToken, resolveForwardRef} from '../../di';
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import {assertInjectImplementationNot, ɵɵinject} from '../../di/injector_compatibility';
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import {Type} from '../../interface/type';
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import {getOrCreateInjectable, injectAttributeImpl} from '../di';
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import {TDirectiveHostNode} from '../interfaces/node';
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import {getLView, getPreviousOrParentTNode} from '../state';
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/**
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* Returns the value associated to the given token from the injectors.
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*
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* `directiveInject` is intended to be used for directive, component and pipe factories.
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* All other injection use `inject` which does not walk the node injector tree.
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*
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* Usage example (in factory function):
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*
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* ```ts
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* class SomeDirective {
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* constructor(directive: DirectiveA) {}
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*
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* static ɵdir = ɵɵdefineDirective({
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* type: SomeDirective,
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* factory: () => new SomeDirective(ɵɵdirectiveInject(DirectiveA))
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* });
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* }
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* ```
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* @param token the type or token to inject
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* @param flags Injection flags
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* @returns the value from the injector or `null` when not found
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*
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* @codeGenApi
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*/
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export function ɵɵdirectiveInject<T>(token: Type<T>|InjectionToken<T>): T;
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export function ɵɵdirectiveInject<T>(token: Type<T>|InjectionToken<T>, flags: InjectFlags): T;
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export function ɵɵdirectiveInject<T>(
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token: Type<T>|InjectionToken<T>, flags = InjectFlags.Default): T|null {
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const lView = getLView();
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// Fall back to inject() if view hasn't been created. This situation can happen in tests
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// if inject utilities are used before bootstrapping.
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if (lView === null) {
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// Verify that we will not get into infinite loop.
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ngDevMode && assertInjectImplementationNot(ɵɵdirectiveInject);
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return ɵɵinject(token, flags);
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}
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const tNode = getPreviousOrParentTNode();
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return getOrCreateInjectable<T>(
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tNode as TDirectiveHostNode, lView, resolveForwardRef(token), flags);
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}
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/**
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* Facade for the attribute injection from DI.
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*
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* @codeGenApi
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*/
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export function ɵɵinjectAttribute(attrNameToInject: string): string|null {
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return injectAttributeImpl(getPreviousOrParentTNode()!, attrNameToInject);
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}
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/**
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* Throws an error indicating that a factory function could not be generated by the compiler for a
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* particular class.
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*
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* This instruction allows the actual error message to be optimized away when ngDevMode is turned
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* off, saving bytes of generated code while still providing a good experience in dev mode.
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*
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* The name of the class is not mentioned here, but will be in the generated factory function name
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* and thus in the stack trace.
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*
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* @codeGenApi
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*/
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export function ɵɵinvalidFactory(): never {
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const msg =
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ngDevMode ? `This constructor was not compatible with Dependency Injection.` : 'invalid';
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throw new Error(msg);
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}
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