9ed4e3df60
This commit introduces the "t2" API, which processes parsed template ASTs and performs a number of functions such as binding (the process of semantically interpreting cross-references within the template) and directive matching. The API is modeled on TypeScript's TypeChecker API, with oracle methods that give access to collected metadata. This work is a prerequisite for the upcoming template type-checking functionality, and will also become the basis for a refactored TemplateDefinitionBuilder. PR Close #26203
61 lines
2.3 KiB
TypeScript
61 lines
2.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. 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 * as e from '../../../src/expression_parser/ast';
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import * as a from '../../../src/render3/r3_ast';
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import {DirectiveMeta} from '../../../src/render3/view/t2_api';
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import {R3TargetBinder} from '../../../src/render3/view/t2_binder';
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import {parseTemplate} from '../../../src/render3/view/template';
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import {CssSelector, SelectorMatcher} from '../../../src/selector';
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import {findExpression} from './util';
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function makeSelectorMatcher(): SelectorMatcher<DirectiveMeta> {
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const matcher = new SelectorMatcher<DirectiveMeta>();
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matcher.addSelectables(CssSelector.parse('[ngFor][ngForOf]'), {
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name: 'NgFor',
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exportAs: null,
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inputs: {'ngForOf': 'ngForOf'},
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outputs: {},
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isComponent: false,
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});
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return matcher;
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}
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describe('t2 binding', () => {
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it('should bind a simple template', () => {
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const template =
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parseTemplate('<div *ngFor="let item of items">{{item.name}}</div>', '', {}, '');
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const binder = new R3TargetBinder(new SelectorMatcher<DirectiveMeta>());
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const res = binder.bind({template: template.nodes});
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const itemBinding = (findExpression(template.nodes, '{{item.name}}') !as e.Interpolation)
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.expressions[0] as e.PropertyRead;
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const item = itemBinding.receiver;
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const itemTarget = res.getExpressionTarget(item);
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if (!(itemTarget instanceof a.Variable)) {
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return fail('Expected item to point to a Variable');
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}
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expect(itemTarget.value).toBe('$implicit');
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const itemTemplate = res.getTemplateOfSymbol(itemTarget);
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expect(itemTemplate).not.toBeNull();
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expect(res.getNestingLevel(itemTemplate !)).toBe(1);
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});
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it('should match directives when binding a simple template', () => {
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const template =
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parseTemplate('<div *ngFor="let item of items">{{item.name}}</div>', '', {}, '');
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const binder = new R3TargetBinder(makeSelectorMatcher());
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const res = binder.bind({template: template.nodes});
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const tmpl = template.nodes[0] as a.Template;
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const directives = res.getDirectivesOfNode(tmpl) !;
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expect(directives).not.toBeNull();
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expect(directives.length).toBe(1);
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expect(directives[0].name).toBe('NgFor');
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});
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}); |