/
binding_spec.ts
181 lines (167 loc) Β· 7.36 KB
/
binding_spec.ts
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/**
* @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,
});
matcher.addSelectables(CssSelector.parse('[dir]'), {
name: 'Dir',
exportAs: null,
inputs: {},
outputs: {},
isComponent: false,
});
matcher.addSelectables(CssSelector.parse('[hasOutput]'), {
name: 'HasOutput',
exportAs: null,
inputs: {},
outputs: {'outputBinding': 'outputBinding'},
isComponent: false,
});
matcher.addSelectables(CssSelector.parse('[hasInput]'), {
name: 'HasInput',
exportAs: null,
inputs: {'inputBinding': 'inputBinding'},
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');
});
it('should match directives on namespaced elements', () => {
const template = parseTemplate('<svg><text dir>SVG</text></svg>', '', {});
const matcher = new SelectorMatcher<DirectiveMeta>();
matcher.addSelectables(CssSelector.parse('text[dir]'), {
name: 'Dir',
exportAs: null,
inputs: {},
outputs: {},
isComponent: false,
});
const binder = new R3TargetBinder(matcher);
const res = binder.bind({template: template.nodes});
const svgNode = template.nodes[0] as a.Element;
const textNode = svgNode.children[0] as a.Element;
const directives = res.getDirectivesOfNode(textNode) !;
expect(directives).not.toBeNull();
expect(directives.length).toBe(1);
expect(directives[0].name).toBe('Dir');
});
it('should not match directives intended for an element on a microsyntax template', () => {
const template = parseTemplate('<div *ngFor="let item of items" dir></div>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const tmpl = template.nodes[0] as a.Template;
const tmplDirectives = res.getDirectivesOfNode(tmpl) !;
expect(tmplDirectives).not.toBeNull();
expect(tmplDirectives.length).toBe(1);
expect(tmplDirectives[0].name).toBe('NgFor');
const elDirectives = res.getDirectivesOfNode(tmpl.children[0] as a.Element) !;
expect(elDirectives).not.toBeNull();
expect(elDirectives.length).toBe(1);
expect(elDirectives[0].name).toBe('Dir');
});
describe('matching inputs to consuming directives', () => {
it('should work for bound attributes', () => {
const template = parseTemplate('<div hasInput [inputBinding]="myValue"></div>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const el = template.nodes[0] as a.Element;
const attr = el.inputs[0];
const consumer = res.getConsumerOfBinding(attr) as DirectiveMeta;
expect(consumer.name).toBe('HasInput');
});
it('should work for text attributes on elements', () => {
const template = parseTemplate('<div hasInput inputBinding="text"></div>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const el = template.nodes[0] as a.Element;
const attr = el.attributes[1];
const consumer = res.getConsumerOfBinding(attr) as DirectiveMeta;
expect(consumer.name).toBe('HasInput');
});
it('should work for text attributes on templates', () => {
const template =
parseTemplate('<ng-template hasInput inputBinding="text"></ng-template>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const el = template.nodes[0] as a.Element;
const attr = el.attributes[1];
const consumer = res.getConsumerOfBinding(attr) as DirectiveMeta;
expect(consumer.name).toBe('HasInput');
});
it('should bind to the encompassing node when no directive input is matched', () => {
const template = parseTemplate('<span dir></span>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const el = template.nodes[0] as a.Element;
const attr = el.attributes[0];
const consumer = res.getConsumerOfBinding(attr);
expect(consumer).toEqual(el);
});
});
describe('matching outputs to consuming directives', () => {
it('should work for bound events', () => {
const template =
parseTemplate('<div hasOutput (outputBinding)="myHandler($event)"></div>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const el = template.nodes[0] as a.Element;
const attr = el.outputs[0];
const consumer = res.getConsumerOfBinding(attr) as DirectiveMeta;
expect(consumer.name).toBe('HasOutput');
});
it('should bind to the encompassing node when no directive output is matched', () => {
const template = parseTemplate('<span dir (fakeOutput)="myHandler($event)"></span>', '', {});
const binder = new R3TargetBinder(makeSelectorMatcher());
const res = binder.bind({template: template.nodes});
const el = template.nodes[0] as a.Element;
const attr = el.outputs[0];
const consumer = res.getConsumerOfBinding(attr);
expect(consumer).toEqual(el);
});
});
});