angular-cn/packages/language-service/ivy/compiler_factory.ts

71 lines
3.0 KiB
TypeScript

/**
* @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 {CompilationTicket, freshCompilationTicket, incrementalFromCompilerTicket, NgCompiler, resourceChangeTicket} from '@angular/compiler-cli/src/ngtsc/core';
import {NgCompilerOptions} from '@angular/compiler-cli/src/ngtsc/core/api';
import {AbsoluteFsPath, resolve} from '@angular/compiler-cli/src/ngtsc/file_system';
import {TrackedIncrementalBuildStrategy} from '@angular/compiler-cli/src/ngtsc/incremental';
import {ProgramDriver} from '@angular/compiler-cli/src/ngtsc/program_driver';
import {LanguageServiceAdapter} from './adapters';
/**
* Manages the `NgCompiler` instance which backs the language service, updating or replacing it as
* needed to produce an up-to-date understanding of the current program.
*
* TODO(alxhub): currently the options used for the compiler are specified at `CompilerFactory`
* construction, and are not changable. In a real project, users can update `tsconfig.json`. We need
* to properly handle a change in the compiler options, either by having an API to update the
* `CompilerFactory` to use new options, or by replacing it entirely.
*/
export class CompilerFactory {
private readonly incrementalStrategy = new TrackedIncrementalBuildStrategy();
private compiler: NgCompiler|null = null;
constructor(
private readonly adapter: LanguageServiceAdapter,
private readonly programStrategy: ProgramDriver,
private readonly options: NgCompilerOptions,
) {}
getOrCreate(): NgCompiler {
const program = this.programStrategy.getProgram();
const modifiedResourceFiles = new Set<AbsoluteFsPath>();
for (const fileName of this.adapter.getModifiedResourceFiles() ?? []) {
modifiedResourceFiles.add(resolve(fileName));
}
if (this.compiler !== null && program === this.compiler.getCurrentProgram()) {
if (modifiedResourceFiles.size > 0) {
// Only resource files have changed since the last NgCompiler was created.
const ticket = resourceChangeTicket(this.compiler, modifiedResourceFiles);
this.compiler = NgCompiler.fromTicket(ticket, this.adapter);
} else {
// The previous NgCompiler is being reused, but we still want to reset its performance
// tracker to capture only the operations that are needed to service the current request.
this.compiler.perfRecorder.reset();
}
return this.compiler;
}
let ticket: CompilationTicket;
if (this.compiler === null) {
ticket = freshCompilationTicket(
program, this.options, this.incrementalStrategy, this.programStrategy,
/* perfRecorder */ null, true, true);
} else {
ticket = incrementalFromCompilerTicket(
this.compiler, program, this.incrementalStrategy, this.programStrategy,
modifiedResourceFiles, /* perfRecorder */ null);
}
this.compiler = NgCompiler.fromTicket(ticket, this.adapter);
return this.compiler;
}
}