angular-cn/packages/language-service/test/expression_diagnostics_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 {StaticSymbol} from '@angular/compiler';
import {Directory} from '@angular/compiler-cli/test/mocks';
import {ReflectorHost} from '@angular/language-service/src/reflector_host';
import * as ts from 'typescript';
import {getTemplateExpressionDiagnostics} from '../src/expression_diagnostics';
import {DiagnosticContext, MockLanguageServiceHost, getDiagnosticTemplateInfo} from './mocks';
describe('expression diagnostics', () => {
let registry: ts.DocumentRegistry;
let host: MockLanguageServiceHost;
let service: ts.LanguageService;
let context: DiagnosticContext;
let type: StaticSymbol;
beforeAll(() => {
registry = ts.createDocumentRegistry(false, '/src');
host = new MockLanguageServiceHost(['app/app.component.ts'], FILES, '/src');
service = ts.createLanguageService(host, registry);
const program = service.getProgram() !;
const checker = program.getTypeChecker();
const symbolResolverHost = new ReflectorHost(() => program !, host);
context = new DiagnosticContext(service, program !, checker, symbolResolverHost);
type = context.getStaticSymbol('app/app.component.ts', 'AppComponent');
});
it('should have no diagnostics in default app', () => {
function messageToString(messageText: string | ts.DiagnosticMessageChain): string {
if (typeof messageText == 'string') {
return messageText;
} else {
if (messageText.next)
return messageText.messageText + messageText.next.map(messageToString);
return messageText.messageText;
}
}
function expectNoDiagnostics(diagnostics: ts.Diagnostic[]) {
if (diagnostics && diagnostics.length) {
const message =
'messages: ' + diagnostics.map(d => messageToString(d.messageText)).join('\n');
expect(message).toEqual('');
}
}
expectNoDiagnostics(service.getCompilerOptionsDiagnostics());
expectNoDiagnostics(service.getSyntacticDiagnostics('app/app.component.ts'));
expectNoDiagnostics(service.getSemanticDiagnostics('app/app.component.ts'));
});
function accept(template: string) {
const info = getDiagnosticTemplateInfo(context, type, 'app/app.component.html', template);
if (info) {
const diagnostics = getTemplateExpressionDiagnostics(info);
if (diagnostics && diagnostics.length) {
const message = diagnostics.map(d => d.message).join('\n ');
throw new Error(`Unexpected diagnostics: ${message}`);
}
} else {
expect(info).toBeDefined();
}
}
function reject(template: string, expected: string) {
const info = getDiagnosticTemplateInfo(context, type, 'app/app.component.html', template);
if (info) {
const diagnostics = getTemplateExpressionDiagnostics(info);
if (diagnostics && diagnostics.length) {
const messages = diagnostics.map(d => d.message).join('\n ');
expect(messages).toContain(expected);
} else {
throw new Error(`Expected an error containing "${expected} in template "${template}"`);
}
} else {
expect(info).toBeDefined();
}
}
it('should accept a simple template', () => accept('App works!'));
it('should accept an interpolation', () => accept('App works: {{person.name.first}}'));
it('should reject misspelled access',
() => reject('{{persson}}', 'Identifier \'persson\' is not defined'));
it('should reject access to private',
() =>
reject('{{private_person}}', 'Identifier \'private_person\' refers to a private member'));
it('should accept an *ngIf', () => accept('<div *ngIf="person">{{person.name.first}}</div>'));
it('should reject *ngIf of misspelled identifier',
() => reject(
'<div *ngIf="persson">{{person.name.first}}</div>',
'Identifier \'persson\' is not defined'));
it('should reject *ngIf of misspelled identifier in PrefixNot node',
() =>
reject('<div *ngIf="people && !persson"></div>', 'Identifier \'persson\' is not defined'));
it('should accept an *ngFor', () => accept(`
<div *ngFor="let p of people">
{{p.name.first}} {{p.name.last}}
</div>
`));
it('should reject misspelled field in *ngFor', () => reject(
`
<div *ngFor="let p of people">
{{p.names.first}} {{p.name.last}}
</div>
`,
'Identifier \'names\' is not defined'));
it('should accept an async expression',
() => accept('{{(promised_person | async)?.name.first || ""}}'));
it('should reject an async misspelled field',
() => reject(
'{{(promised_person | async)?.nume.first || ""}}', 'Identifier \'nume\' is not defined'));
it('should accept an async *ngFor', () => accept(`
<div *ngFor="let p of promised_people | async">
{{p.name.first}} {{p.name.last}}
</div>
`));
it('should reject misspelled field an async *ngFor', () => reject(
`
<div *ngFor="let p of promised_people | async">
{{p.name.first}} {{p.nume.last}}
</div>
`,
'Identifier \'nume\' is not defined'));
it('should accept an async *ngIf', () => accept(`
<div *ngIf="promised_person | async as p">
{{p.name.first}} {{p.name.last}}
</div>
`));
it('should reject misspelled field in async *ngIf', () => reject(
`
<div *ngIf="promised_person | async as p">
{{p.name.first}} {{p.nume.last}}
</div>
`,
'Identifier \'nume\' is not defined'));
it('should reject access to potentially undefined field',
() => reject(
`<div>{{maybe_person.name.first}}`,
`'maybe_person' is possibly undefined. Consider using the safe navigation operator (maybe_person?.name) or non-null assertion operator (maybe_person!.name).`));
it('should accept a safe accss to an undefined field',
() => accept(`<div>{{maybe_person?.name.first}}</div>`));
it('should accept a type assert to an undefined field',
() => accept(`<div>{{maybe_person!.name.first}}</div>`));
it('should accept a # reference', () => accept(`
<form #f="ngForm" novalidate>
<input name="first" ngModel required #first="ngModel">
<input name="last" ngModel>
<button>Submit</button>
</form>
<p>First name value: {{ first.value }}</p>
<p>First name valid: {{ first.valid }}</p>
<p>Form value: {{ f.value | json }}</p>
<p>Form valid: {{ f.valid }}</p>
`));
it('should reject a misspelled field of a # reference',
() => reject(
`
<form #f="ngForm" novalidate>
<input name="first" ngModel required #first="ngModel">
<input name="last" ngModel>
<button>Submit</button>
</form>
<p>First name value: {{ first.valwe }}</p>
<p>First name valid: {{ first.valid }}</p>
<p>Form value: {{ f.value | json }}</p>
<p>Form valid: {{ f.valid }}</p>
`,
'Identifier \'valwe\' is not defined'));
it('should accept a call to a method', () => accept('{{getPerson().name.first}}'));
it('should reject a misspelled field of a method result',
() => reject('{{getPerson().nume.first}}', 'Identifier \'nume\' is not defined'));
it('should reject calling a uncallable member',
() => reject('{{person().name.first}}', '\'person\' is not callable'));
it('should accept an event handler',
() => accept('<div (click)="click($event)">{{person.name.first}}</div>'));
it('should reject a misspelled event handler',
() => reject(
'<div (click)="clack($event)">{{person.name.first}}</div>',
`Identifier 'clack' is not defined. The component declaration, template variable declarations, and element references do not contain such a member`));
it('should reject an uncalled event handler',
() => reject(
'<div (click)="click">{{person.name.first}}</div>', 'Unexpected callable expression'));
describe('with comparisons between nullable and non-nullable', () => {
it('should accept ==', () => accept(`<div>{{e == 1 ? 'a' : 'b'}}</div>`));
it('should accept ===', () => accept(`<div>{{e === 1 ? 'a' : 'b'}}</div>`));
it('should accept !=', () => accept(`<div>{{e != 1 ? 'a' : 'b'}}</div>`));
it('should accept !==', () => accept(`<div>{{e !== 1 ? 'a' : 'b'}}</div>`));
it('should accept &&', () => accept(`<div>{{e && 1 ? 'a' : 'b'}}</div>`));
it('should accept ||', () => accept(`<div>{{e || 1 ? 'a' : 'b'}}</div>`));
it('should reject >',
() => reject(`<div>{{e > 1 ? 'a' : 'b'}}</div>`, 'The expression might be null'));
});
});
const FILES: Directory = {
'src': {
'app': {
'app.component.ts': `
import { Component, NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
export interface Person {
name: Name;
address: Address;
}
export interface Name {
first: string;
middle: string;
last: string;
}
export interface Address {
street: string;
city: string;
state: string;
zip: string;
}
@Component({
selector: 'my-app',
templateUrl: './app.component.html'
})
export class AppComponent {
person: Person;
people: Person[];
maybe_person?: Person;
promised_person: Promise<Person>;
promised_people: Promise<Person[]>;
private private_person: Person;
private private_people: Person[];
e?: number;
getPerson(): Person { return this.person; }
click() {}
}
@NgModule({
imports: [CommonModule, FormsModule],
declarations: [AppComponent]
})
export class AppModule {}
`
}
}
};