angular-cn/packages/compiler/test/render3/view/binding_spec.ts

59 lines
2.3 KiB
TypeScript
Raw Normal View History

/**
* @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 * as e from '../../../src/expression_parser/ast';
import * as a from '../../../src/render3/r3_ast';
import {DirectiveMeta} from '../../../src/render3/view/t2_api';
import {R3TargetBinder} from '../../../src/render3/view/t2_binder';
import {parseTemplate} from '../../../src/render3/view/template';
import {CssSelector, SelectorMatcher} from '../../../src/selector';
import {findExpression} from './util';
function makeSelectorMatcher(): SelectorMatcher<DirectiveMeta> {
const matcher = new SelectorMatcher<DirectiveMeta>();
matcher.addSelectables(CssSelector.parse('[ngFor][ngForOf]'), {
name: 'NgFor',
exportAs: null,
inputs: {'ngForOf': 'ngForOf'},
outputs: {},
isComponent: false,
});
return matcher;
}
describe('t2 binding', () => {
it('should bind a simple template', () => {
const template = parseTemplate('<div *ngFor="let item of items">{{item.name}}</div>', '', {});
const binder = new R3TargetBinder(new SelectorMatcher<DirectiveMeta>());
const res = binder.bind({template: template.nodes});
const itemBinding = (findExpression(template.nodes, '{{item.name}}') !as e.Interpolation)
.expressions[0] as e.PropertyRead;
const item = itemBinding.receiver;
const itemTarget = res.getExpressionTarget(item);
if (!(itemTarget instanceof a.Variable)) {
return fail('Expected item to point to a Variable');
}
expect(itemTarget.value).toBe('$implicit');
const itemTemplate = res.getTemplateOfSymbol(itemTarget);
expect(itemTemplate).not.toBeNull();
expect(res.getNestingLevel(itemTemplate !)).toBe(1);
});
it('should match directives when binding a simple template', () => {
const template = parseTemplate('<div *ngFor="let item of items">{{item.name}}</div>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const tmpl = template.nodes[0] as a.Template;
const directives = res.getDirectivesOfNode(tmpl) !;
expect(directives).not.toBeNull();
expect(directives.length).toBe(1);
expect(directives[0].name).toBe('NgFor');
});
});