76 lines
2.8 KiB
TypeScript
76 lines
2.8 KiB
TypeScript
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/**
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* @license
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* Copyright Google LLC 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 {NgCompiler} from '@angular/compiler-cli/src/ngtsc/core';
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import {NgCompilerOptions} from '@angular/compiler-cli/src/ngtsc/core/api';
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import {TrackedIncrementalBuildStrategy} from '@angular/compiler-cli/src/ngtsc/incremental';
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import {TypeCheckingProgramStrategy} from '@angular/compiler-cli/src/ngtsc/typecheck/api';
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import * as ts from 'typescript/lib/tsserverlibrary';
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import {isExternalTemplate, LanguageServiceAdapter} from './language_service_adapter';
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export class CompilerFactory {
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private readonly incrementalStrategy = new TrackedIncrementalBuildStrategy();
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private compiler: NgCompiler|null = null;
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private lastKnownProgram: ts.Program|null = null;
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constructor(
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private readonly adapter: LanguageServiceAdapter,
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private readonly programStrategy: TypeCheckingProgramStrategy,
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) {}
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/**
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* Create a new instance of the Ivy compiler if the program has changed since
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* the last time the compiler was instantiated. If the program has not changed,
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* return the existing instance.
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* @param fileName override the template if this is an external template file
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* @param options angular compiler options
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*/
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getOrCreateWithChangedFile(fileName: string, options: NgCompilerOptions): NgCompiler {
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const program = this.programStrategy.getProgram();
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if (!this.compiler || program !== this.lastKnownProgram) {
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this.compiler = new NgCompiler(
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this.adapter, // like compiler host
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options, // angular compiler options
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program,
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this.programStrategy,
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this.incrementalStrategy,
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true, // enableTemplateTypeChecker
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this.lastKnownProgram,
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undefined, // perfRecorder (use default)
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);
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this.lastKnownProgram = program;
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}
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if (isExternalTemplate(fileName)) {
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this.overrideTemplate(fileName, this.compiler);
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}
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return this.compiler;
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}
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private overrideTemplate(fileName: string, compiler: NgCompiler) {
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if (!this.adapter.isTemplateDirty(fileName)) {
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return;
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}
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// 1. Get the latest snapshot
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const latestTemplate = this.adapter.readResource(fileName);
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// 2. Find all components that use the template
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const ttc = compiler.getTemplateTypeChecker();
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const components = compiler.getComponentsWithTemplateFile(fileName);
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// 3. Update component template
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for (const component of components) {
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if (ts.isClassDeclaration(component)) {
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ttc.overrideComponentTemplate(component, latestTemplate);
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}
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}
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}
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registerLastKnownProgram() {
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this.lastKnownProgram = this.programStrategy.getProgram();
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}
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}
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