@angular/core
Version:
Angular - the core framework
62 lines • 7.45 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 { performanceMarkFeature } from '../../util/performance';
import { HEADER_OFFSET } from '../interfaces/view';
import { getContextLView, getLView, getSelectedIndex, getTView, setCurrentTNode } from '../state';
import { load } from '../util/view_utils';
import { getOrCreateTNode } from './shared';
import { store } from './storage';
/** Object that indicates the value of a `@let` declaration that hasn't been initialized yet. */
const UNINITIALIZED_LET = {};
/**
* Declares an `@let` at a specific data slot. Returns itself to allow chaining.
*
* @param index Index at which to declare the `@let`.
*
* @codeGenApi
*/
export function ɵɵdeclareLet(index) {
const tView = getTView();
const lView = getLView();
const adjustedIndex = index + HEADER_OFFSET;
const tNode = getOrCreateTNode(tView, adjustedIndex, 128 /* TNodeType.LetDeclaration */, null, null);
setCurrentTNode(tNode, false);
store(tView, lView, adjustedIndex, UNINITIALIZED_LET);
return ɵɵdeclareLet;
}
/**
* Instruction that stores the value of a `@let` declaration on the current view.
* Returns the value to allow usage inside variable initializers.
*
* @codeGenApi
*/
export function ɵɵstoreLet(value) {
performanceMarkFeature('NgLet');
const tView = getTView();
const lView = getLView();
const index = getSelectedIndex();
store(tView, lView, index, value);
return value;
}
/**
* Retrieves the value of a `@let` declaration defined in a parent view.
*
* @param index Index of the declaration within the view.
*
* @codeGenApi
*/
export function ɵɵreadContextLet(index) {
const contextLView = getContextLView();
const value = load(contextLView, HEADER_OFFSET + index);
if (value === UNINITIALIZED_LET) {
throw new RuntimeError(314 /* RuntimeErrorCode.UNINITIALIZED_LET_ACCESS */, ngDevMode && 'Attempting to access a @let declaration whose value is not available yet');
}
return value;
}
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