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@angular/compiler

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Angular - the compiler library

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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 { identifierName, ngModuleJitUrl, sharedStylesheetJitUrl, templateJitUrl, templateSourceUrl } from '../compile_metadata'; import { ConstantPool } from '../constant_pool'; import * as ir from '../output/output_ast'; import { interpretStatements } from '../output/output_interpreter'; import { jitStatements } from '../output/output_jit'; import { SyncAsync, stringify } from '../util'; /** * An internal module of the Angular compiler that begins with component types, * extracts templates, and eventually produces a compiled version of the component * ready for linking into an application. * * @security When compiling templates at runtime, you must ensure that the entire template comes * from a trusted source. Attacker-controlled data introduced by a template could expose your * application to XSS risks. For more detail, see the [Security Guide](http://g.co/ng/security). */ export class JitCompiler { constructor(_metadataResolver, _templateParser, _styleCompiler, _viewCompiler, _ngModuleCompiler, _summaryResolver, _reflector, _compilerConfig, _console, getExtraNgModuleProviders) { this._metadataResolver = _metadataResolver; this._templateParser = _templateParser; this._styleCompiler = _styleCompiler; this._viewCompiler = _viewCompiler; this._ngModuleCompiler = _ngModuleCompiler; this._summaryResolver = _summaryResolver; this._reflector = _reflector; this._compilerConfig = _compilerConfig; this._console = _console; this.getExtraNgModuleProviders = getExtraNgModuleProviders; this._compiledTemplateCache = new Map(); this._compiledHostTemplateCache = new Map(); this._compiledDirectiveWrapperCache = new Map(); this._compiledNgModuleCache = new Map(); this._sharedStylesheetCount = 0; this._addedAotSummaries = new Set(); } compileModuleSync(moduleType) { return SyncAsync.assertSync(this._compileModuleAndComponents(moduleType, true)); } compileModuleAsync(moduleType) { return Promise.resolve(this._compileModuleAndComponents(moduleType, false)); } compileModuleAndAllComponentsSync(moduleType) { return SyncAsync.assertSync(this._compileModuleAndAllComponents(moduleType, true)); } compileModuleAndAllComponentsAsync(moduleType) { return Promise.resolve(this._compileModuleAndAllComponents(moduleType, false)); } getComponentFactory(component) { const summary = this._metadataResolver.getDirectiveSummary(component); return summary.componentFactory; } loadAotSummaries(summaries) { this.clearCache(); this._addAotSummaries(summaries); } _addAotSummaries(fn) { if (this._addedAotSummaries.has(fn)) { return; } this._addedAotSummaries.add(fn); const summaries = fn(); for (let i = 0; i < summaries.length; i++) { const entry = summaries[i]; if (typeof entry === 'function') { this._addAotSummaries(entry); } else { const summary = entry; this._summaryResolver.addSummary({ symbol: summary.type.reference, metadata: null, type: summary }); } } } hasAotSummary(ref) { return !!this._summaryResolver.resolveSummary(ref); } _filterJitIdentifiers(ids) { return ids.map(mod => mod.reference).filter((ref) => !this.hasAotSummary(ref)); } _compileModuleAndComponents(moduleType, isSync) { return SyncAsync.then(this._loadModules(moduleType, isSync), () => { this._compileComponents(moduleType, null); return this._compileModule(moduleType); }); } _compileModuleAndAllComponents(moduleType, isSync) { return SyncAsync.then(this._loadModules(moduleType, isSync), () => { const componentFactories = []; this._compileComponents(moduleType, componentFactories); return { ngModuleFactory: this._compileModule(moduleType), componentFactories: componentFactories }; }); } _loadModules(mainModule, isSync) { const loading = []; const mainNgModule = this._metadataResolver.getNgModuleMetadata(mainModule); // Note: for runtime compilation, we want to transitively compile all modules, // so we also need to load the declared directives / pipes for all nested modules. this._filterJitIdentifiers(mainNgModule.transitiveModule.modules).forEach((nestedNgModule) => { // getNgModuleMetadata only returns null if the value passed in is not an NgModule const moduleMeta = this._metadataResolver.getNgModuleMetadata(nestedNgModule); this._filterJitIdentifiers(moduleMeta.declaredDirectives).forEach((ref) => { const promise = this._metadataResolver.loadDirectiveMetadata(moduleMeta.type.reference, ref, isSync); if (promise) { loading.push(promise); } }); this._filterJitIdentifiers(moduleMeta.declaredPipes) .forEach((ref) => this._metadataResolver.getOrLoadPipeMetadata(ref)); }); return SyncAsync.all(loading); } _compileModule(moduleType) { let ngModuleFactory = this._compiledNgModuleCache.get(moduleType); if (!ngModuleFactory) { const moduleMeta = this._metadataResolver.getNgModuleMetadata(moduleType); // Always provide a bound Compiler const extraProviders = this.getExtraNgModuleProviders(moduleMeta.type.reference); const outputCtx = createOutputContext(); const compileResult = this._ngModuleCompiler.compile(outputCtx, moduleMeta, extraProviders); ngModuleFactory = this._interpretOrJit(ngModuleJitUrl(moduleMeta), outputCtx.statements)[compileResult.ngModuleFactoryVar]; this._compiledNgModuleCache.set(moduleMeta.type.reference, ngModuleFactory); } return ngModuleFactory; } /** * @internal */ _compileComponents(mainModule, allComponentFactories) { const ngModule = this._metadataResolver.getNgModuleMetadata(mainModule); const moduleByJitDirective = new Map(); const templates = new Set(); const transJitModules = this._filterJitIdentifiers(ngModule.transitiveModule.modules); transJitModules.forEach((localMod) => { const localModuleMeta = this._metadataResolver.getNgModuleMetadata(localMod); this._filterJitIdentifiers(localModuleMeta.declaredDirectives).forEach((dirRef) => { moduleByJitDirective.set(dirRef, localModuleMeta); const dirMeta = this._metadataResolver.getDirectiveMetadata(dirRef); if (dirMeta.isComponent) { templates.add(this._createCompiledTemplate(dirMeta, localModuleMeta)); if (allComponentFactories) { const template = this._createCompiledHostTemplate(dirMeta.type.reference, localModuleMeta); templates.add(template); allComponentFactories.push(dirMeta.componentFactory); } } }); }); transJitModules.forEach((localMod) => { const localModuleMeta = this._metadataResolver.getNgModuleMetadata(localMod); this._filterJitIdentifiers(localModuleMeta.declaredDirectives).forEach((dirRef) => { const dirMeta = this._metadataResolver.getDirectiveMetadata(dirRef); if (dirMeta.isComponent) { dirMeta.entryComponents.forEach((entryComponentType) => { const moduleMeta = moduleByJitDirective.get(entryComponentType.componentType); templates.add(this._createCompiledHostTemplate(entryComponentType.componentType, moduleMeta)); }); } }); localModuleMeta.entryComponents.forEach((entryComponentType) => { if (!this.hasAotSummary(entryComponentType.componentType)) { const moduleMeta = moduleByJitDirective.get(entryComponentType.componentType); templates.add(this._createCompiledHostTemplate(entryComponentType.componentType, moduleMeta)); } }); }); templates.forEach((template) => this._compileTemplate(template)); } clearCacheFor(type) { this._compiledNgModuleCache.delete(type); this._metadataResolver.clearCacheFor(type); this._compiledHostTemplateCache.delete(type); const compiledTemplate = this._compiledTemplateCache.get(type); if (compiledTemplate) { this._compiledTemplateCache.delete(type); } } clearCache() { // Note: don't clear the _addedAotSummaries, as they don't change! this._metadataResolver.clearCache(); this._compiledTemplateCache.clear(); this._compiledHostTemplateCache.clear(); this._compiledNgModuleCache.clear(); } _createCompiledHostTemplate(compType, ngModule) { if (!ngModule) { throw new Error(`Component ${stringify(compType)} is not part of any NgModule or the module has not been imported into your module.`); } let compiledTemplate = this._compiledHostTemplateCache.get(compType); if (!compiledTemplate) { const compMeta = this._metadataResolver.getDirectiveMetadata(compType); assertComponent(compMeta); const hostMeta = this._metadataResolver.getHostComponentMetadata(compMeta, compMeta.componentFactory.viewDefFactory); compiledTemplate = new CompiledTemplate(true, compMeta.type, hostMeta, ngModule, [compMeta.type]); this._compiledHostTemplateCache.set(compType, compiledTemplate); } return compiledTemplate; } _createCompiledTemplate(compMeta, ngModule) { let compiledTemplate = this._compiledTemplateCache.get(compMeta.type.reference); if (!compiledTemplate) { assertComponent(compMeta); compiledTemplate = new CompiledTemplate(false, compMeta.type, compMeta, ngModule, ngModule.transitiveModule.directives); this._compiledTemplateCache.set(compMeta.type.reference, compiledTemplate); } return compiledTemplate; } _compileTemplate(template) { if (template.isCompiled) { return; } const compMeta = template.compMeta; const externalStylesheetsByModuleUrl = new Map(); const outputContext = createOutputContext(); const componentStylesheet = this._styleCompiler.compileComponent(outputContext, compMeta); compMeta.template.externalStylesheets.forEach((stylesheetMeta) => { const compiledStylesheet = this._styleCompiler.compileStyles(createOutputContext(), compMeta, stylesheetMeta); externalStylesheetsByModuleUrl.set(stylesheetMeta.moduleUrl, compiledStylesheet); }); this._resolveStylesCompileResult(componentStylesheet, externalStylesheetsByModuleUrl); const pipes = template.ngModule.transitiveModule.pipes.map(pipe => this._metadataResolver.getPipeSummary(pipe.reference)); const { template: parsedTemplate, pipes: usedPipes } = this._parseTemplate(compMeta, template.ngModule, template.directives); const compileResult = this._viewCompiler.compileComponent(outputContext, compMeta, parsedTemplate, ir.variable(componentStylesheet.stylesVar), usedPipes); const evalResult = this._interpretOrJit(templateJitUrl(template.ngModule.type, template.compMeta), outputContext.statements); const viewClass = evalResult[compileResult.viewClassVar]; const rendererType = evalResult[compileResult.rendererTypeVar]; template.compiled(viewClass, rendererType); } _parseTemplate(compMeta, ngModule, directiveIdentifiers) { // Note: ! is ok here as components always have a template. const preserveWhitespaces = compMeta.template.preserveWhitespaces; const directives = directiveIdentifiers.map(dir => this._metadataResolver.getDirectiveSummary(dir.reference)); const pipes = ngModule.transitiveModule.pipes.map(pipe => this._metadataResolver.getPipeSummary(pipe.reference)); return this._templateParser.parse(compMeta, compMeta.template.htmlAst, directives, pipes, ngModule.schemas, templateSourceUrl(ngModule.type, compMeta, compMeta.template), preserveWhitespaces); } _resolveStylesCompileResult(result, externalStylesheetsByModuleUrl) { result.dependencies.forEach((dep, i) => { const nestedCompileResult = externalStylesheetsByModuleUrl.get(dep.moduleUrl); const nestedStylesArr = this._resolveAndEvalStylesCompileResult(nestedCompileResult, externalStylesheetsByModuleUrl); dep.setValue(nestedStylesArr); }); } _resolveAndEvalStylesCompileResult(result, externalStylesheetsByModuleUrl) { this._resolveStylesCompileResult(result, externalStylesheetsByModuleUrl); return this._interpretOrJit(sharedStylesheetJitUrl(result.meta, this._sharedStylesheetCount++), result.outputCtx.statements)[result.stylesVar]; } _interpretOrJit(sourceUrl, statements) { if (!this._compilerConfig.useJit) { return interpretStatements(statements, this._reflector); } else { return jitStatements(sourceUrl, statements, this._reflector, this._compilerConfig.jitDevMode); } } } class CompiledTemplate { constructor(isHost, compType, compMeta, ngModule, directives) { this.isHost = isHost; this.compType = compType; this.compMeta = compMeta; this.ngModule = ngModule; this.directives = directives; this._viewClass = null; this.isCompiled = false; } compiled(viewClass, rendererType) { this._viewClass = viewClass; this.compMeta.componentViewType.setDelegate(viewClass); for (let prop in rendererType) { this.compMeta.rendererType[prop] = rendererType[prop]; } this.isCompiled = true; } } function assertComponent(meta) { if (!meta.isComponent) { throw new Error(`Could not compile '${identifierName(meta.type)}' because it is not a component.`); } } function createOutputContext() { const importExpr = (symbol) => ir.importExpr({ name: identifierName(symbol), moduleName: null, runtime: symbol }); return { statements: [], genFilePath: '', importExpr, constantPool: new ConstantPool() }; } //# 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* @license\n * Copyright Google Inc. All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {CompileDirectiveMetadata, CompileIdentifierMetadata, CompileNgModuleMetadata, CompilePipeSummary, CompileProviderMetadata, CompileStylesheetMetadata, CompileTypeSummary, ProviderMeta, ProxyClass, identifierName, ngModuleJitUrl, sharedStylesheetJitUrl, templateJitUrl, templateSourceUrl} from '../compile_metadata';\nimport {CompileReflector} from '../compile_reflector';\nimport {CompilerConfig} from '../config';\nimport {ConstantPool} from '../constant_pool';\nimport {Type} from '../core';\nimport {CompileMetadataResolver} from '../metadata_resolver';\nimport {NgModuleCompiler} from '../ng_module_compiler';\nimport * as ir from '../output/output_ast';\nimport {interpretStatements} from '../output/output_interpreter';\nimport {jitStatements} from '../output/output_jit';\nimport {CompiledStylesheet, StyleCompiler} from '../style_compiler';\nimport {SummaryResolver} from '../summary_resolver';\nimport {TemplateAst} from '../template_parser/template_ast';\nimport {TemplateParser} from '../template_parser/template_parser';\nimport {Console, OutputContext, SyncAsync, stringify} from '../util';\nimport {ViewCompiler} from '../view_compiler/view_compiler';\n\nexport interface ModuleWithComponentFactories {\n  ngModuleFactory: object;\n  componentFactories: object[];\n}\n\n/**\n * An internal module of the Angular compiler that begins with component types,\n * extracts templates, and eventually produces a compiled version of the component\n * ready for linking into an application.\n *\n * @security  When compiling templates at runtime, you must ensure that the entire template comes\n * from a trusted source. Attacker-controlled data introduced by a template could expose your\n * application to XSS risks.  For more detail, see the [Security Guide](http://g.co/ng/security).\n */\nexport class JitCompiler {\n  private _compiledTemplateCache = new Map<Type, CompiledTemplate>();\n  private _compiledHostTemplateCache = new Map<Type, CompiledTemplate>();\n  private _compiledDirectiveWrapperCache = new Map<Type, Type>();\n  private _compiledNgModuleCache = new Map<Type, object>();\n  private _sharedStylesheetCount = 0;\n  private _addedAotSummaries = new Set<() => any[]>();\n\n  constructor(\n      private _metadataResolver: CompileMetadataResolver, private _templateParser: TemplateParser,\n      private _styleCompiler: StyleCompiler, private _viewCompiler: ViewCompiler,\n      private _ngModuleCompiler: NgModuleCompiler, private _summaryResolver: SummaryResolver<Type>,\n      private _reflector: CompileReflector, private _compilerConfig: CompilerConfig,\n      private _console: Console,\n      private getExtraNgModuleProviders: (ngModule: any) => CompileProviderMetadata[]) {}\n\n  compileModuleSync(moduleType: Type): object {\n    return SyncAsync.assertSync(this._compileModuleAndComponents(moduleType, true));\n  }\n\n  compileModuleAsync(moduleType: Type): Promise<object> {\n    return Promise.resolve(this._compileModuleAndComponents(moduleType, false));\n  }\n\n  compileModuleAndAllComponentsSync(moduleType: Type): ModuleWithComponentFactories {\n    return SyncAsync.assertSync(this._compileModuleAndAllComponents(moduleType, true));\n  }\n\n  compileModuleAndAllComponentsAsync(moduleType: Type): Promise<ModuleWithComponentFactories> {\n    return Promise.resolve(this._compileModuleAndAllComponents(moduleType, false));\n  }\n\n  getComponentFactory(component: Type): object {\n    const summary = this._metadataResolver.getDirectiveSummary(component);\n    return summary.componentFactory as object;\n  }\n\n  loadAotSummaries(summaries: () => any[]) {\n    this.clearCache();\n    this._addAotSummaries(summaries);\n  }\n\n  private _addAotSummaries(fn: () => any[]) {\n    if (this._addedAotSummaries.has(fn)) {\n      return;\n    }\n    this._addedAotSummaries.add(fn);\n    const summaries = fn();\n    for (let i = 0; i < summaries.length; i++) {\n      const entry = summaries[i];\n      if (typeof entry === 'function') {\n        this._addAotSummaries(entry);\n      } else {\n        const summary = entry as CompileTypeSummary;\n        this._summaryResolver.addSummary(\n            {symbol: summary.type.reference, metadata: null, type: summary});\n      }\n    }\n  }\n\n  hasAotSummary(ref: Type) { return !!this._summaryResolver.resolveSummary(ref); }\n\n  private _filterJitIdentifiers(ids: CompileIdentifierMetadata[]): any[] {\n    return ids.map(mod => mod.reference).filter((ref) => !this.hasAotSummary(ref));\n  }\n\n  private _compileModuleAndComponents(moduleType: Type, isSync: boolean): SyncAsync<object> {\n    return SyncAsync.then(this._loadModules(moduleType, isSync), () => {\n      this._compileComponents(moduleType, null);\n      return this._compileModule(moduleType);\n    });\n  }\n\n  private _compileModuleAndAllComponents(moduleType: Type, isSync: boolean):\n      SyncAsync<ModuleWithComponentFactories> {\n    return SyncAsync.then(this._loadModules(moduleType, isSync), () => {\n      const componentFactories: object[] = [];\n      this._compileComponents(moduleType, componentFactories);\n      return {\n        ngModuleFactory: this._compileModule(moduleType),\n        componentFactories: componentFactories\n      };\n    });\n  }\n\n  private _loadModules(mainModule: any, isSync: boolean): SyncAsync<any> {\n    const loading: Promise<any>[] = [];\n    const mainNgModule = this._metadataResolver.getNgModuleMetadata(mainModule) !;\n    // Note: for runtime compilation, we want to transitively compile all modules,\n    // so we also need to load the declared directives / pipes for all nested modules.\n    this._filterJitIdentifiers(mainNgModule.transitiveModule.modules).forEach((nestedNgModule) => {\n      // getNgModuleMetadata only returns null if the value passed in is not an NgModule\n      const moduleMeta = this._metadataResolver.getNgModuleMetadata(nestedNgModule) !;\n      this._filterJitIdentifiers(moduleMeta.declaredDirectives).forEach((ref) => {\n        const promise =\n            this._metadataResolver.loadDirectiveMetadata(moduleMeta.type.reference, ref, isSync);\n        if (promise) {\n          loading.push(promise);\n        }\n      });\n      this._filterJitIdentifiers(moduleMeta.declaredPipes)\n          .forEach((ref) => this._metadataResolver.getOrLoadPipeMetadata(ref));\n    });\n    return SyncAsync.all(loading);\n  }\n\n  private _compileModule(moduleType: Type): object {\n    let ngModuleFactory = this._compiledNgModuleCache.get(moduleType) !;\n    if (!ngModuleFactory) {\n      const moduleMeta = this._metadataResolver.getNgModuleMetadata(moduleType) !;\n      // Always provide a bound Compiler\n      const extraProviders = this.getExtraNgModuleProviders(moduleMeta.type.reference);\n      const outputCtx = createOutputContext();\n      const compileResult = this._ngModuleCompiler.compile(outputCtx, moduleMeta, extraProviders);\n      ngModuleFactory = this._interpretOrJit(\n          ngModuleJitUrl(moduleMeta), outputCtx.statements)[compileResult.ngModuleFactoryVar];\n      this._compiledNgModuleCache.set(moduleMeta.type.reference, ngModuleFactory);\n    }\n    return ngModuleFactory;\n  }\n\n  /**\n   * @internal\n   */\n  _compileComponents(mainModule: Type, allComponentFactories: object[]|null) {\n    const ngModule = this._metadataResolver.getNgModuleMetadata(mainModule) !;\n    const moduleByJitDirective = new Map<any, CompileNgModuleMetadata>();\n    const templates = new Set<CompiledTemplate>();\n\n    const transJitModules = this._filterJitIdentifiers(ngModule.transitiveModule.modules);\n    transJitModules.forEach((localMod) => {\n      const localModuleMeta = this._metadataResolver.getNgModuleMetadata(localMod) !;\n      this._filterJitIdentifiers(localModuleMeta.declaredDirectives).forEach((dirRef) => {\n        moduleByJitDirective.set(dirRef, localModuleMeta);\n        const dirMeta = this._metadataResolver.getDirectiveMetadata(dirRef);\n        if (dirMeta.isComponent) {\n          templates.add(this._createCompiledTemplate(dirMeta, localModuleMeta));\n          if (allComponentFactories) {\n            const template =\n                this._createCompiledHostTemplate(dirMeta.type.reference, localModuleMeta);\n            templates.add(template);\n            allComponentFactories.push(dirMeta.componentFactory as object);\n          }\n        }\n      });\n    });\n    transJitModules.forEach((localMod) => {\n      const localModuleMeta = this._metadataResolver.getNgModuleMetadata(localMod) !;\n      this._filterJitIdentifiers(localModuleMeta.declaredDirectives).forEach((dirRef) => {\n        const dirMeta = this._metadataResolver.getDirectiveMetadata(dirRef);\n        if (dirMeta.isComponent) {\n          dirMeta.entryComponents.forEach((entryComponentType) => {\n            const moduleMeta = moduleByJitDirective.get(entryComponentType.componentType) !;\n            templates.add(\n                this._createCompiledHostTemplate(entryComponentType.componentType, moduleMeta));\n          });\n        }\n      });\n      localModuleMeta.entryComponents.forEach((entryComponentType) => {\n        if (!this.hasAotSummary(entryComponentType.componentType)) {\n          const moduleMeta = moduleByJitDirective.get(entryComponentType.componentType) !;\n          templates.add(\n              this._createCompiledHostTemplate(entryComponentType.componentType, moduleMeta));\n        }\n      });\n    });\n    templates.forEach((template) => this._compileTemplate(template));\n  }\n\n  clearCacheFor(type: Type) {\n    this._compiledNgModuleCache.delete(type);\n    this._metadataResolver.clearCacheFor(type);\n    this._compiledHostTemplateCache.delete(type);\n    const compiledTemplate = this._compiledTemplateCache.get(type);\n    if (compiledTemplate) {\n      this._compiledTemplateCache.delete(type);\n    }\n  }\n\n  clearCache(): void {\n    // Note: don't clear the _addedAotSummaries, as they don't change!\n    this._metadataResolver.clearCache();\n    this._compiledTemplateCache.clear();\n    this._compiledHostTemplateCache.clear();\n    this._compiledNgModuleCache.clear();\n  }\n\n  private _createCompiledHostTemplate(compType: Type, ngModule: CompileNgModuleMetadata):\n      CompiledTemplate {\n    if (!ngModule) {\n      throw new Error(\n          `Component ${stringify(compType)} is not part of any NgModule or the module has not been imported into your module.`);\n    }\n    let compiledTemplate = this._compiledHostTemplateCache.get(compType);\n    if (!compiledTemplate) {\n      const compMeta = this._metadataResolver.getDirectiveMetadata(compType);\n      assertComponent(compMeta);\n\n      const hostMeta = this._metadataResolver.getHostComponentMetadata(\n          compMeta, (compMeta.componentFactory as any).viewDefFactory);\n      compiledTemplate =\n          new CompiledTemplate(true, compMeta.type, hostMeta, ngModule, [compMeta.type]);\n      this._compiledHostTemplateCache.set(compType, compiledTemplate);\n    }\n    return compiledTemplate;\n  }\n\n  private _createCompiledTemplate(\n      compMeta: CompileDirectiveMetadata, ngModule: CompileNgModuleMetadata): CompiledTemplate {\n    let compiledTemplate = this._compiledTemplateCache.get(compMeta.type.reference);\n    if (!compiledTemplate) {\n      assertComponent(compMeta);\n      compiledTemplate = new CompiledTemplate(\n          false, compMeta.type, compMeta, ngModule, ngModule.transitiveModule.directives);\n      this._compiledTemplateCache.set(compMeta.type.reference, compiledTemplate);\n    }\n    return compiledTemplate;\n  }\n\n  private _compileTemplate(template: CompiledTemplate) {\n    if (template.isCompiled) {\n      return;\n    }\n    const compMeta = template.compMeta;\n    const externalStylesheetsByModuleUrl = new Map<string, CompiledStylesheet>();\n    const outputContext = createOutputContext();\n    const componentStylesheet = this._styleCompiler.compileComponent(outputContext, compMeta);\n    compMeta.template !.externalStylesheets.forEach((stylesheetMeta) => {\n      const compiledStylesheet =\n          this._styleCompiler.compileStyles(createOutputContext(), compMeta, stylesheetMeta);\n      externalStylesheetsByModuleUrl.set(stylesheetMeta.moduleUrl !, compiledStylesheet);\n    });\n    this._resolveStylesCompileResult(componentStylesheet, externalStylesheetsByModuleUrl);\n    const pipes = template.ngModule.transitiveModule.pipes.map(\n        pipe => this._metadataResolver.getPipeSummary(pipe.reference));\n    const {template: parsedTemplate, pipes: usedPipes} =\n        this._parseTemplate(compMeta, template.ngModule, template.directives);\n    const compileResult = this._viewCompiler.compileComponent(\n        outputContext, compMeta, parsedTemplate, ir.variable(componentStylesheet.stylesVar),\n        usedPipes);\n    const evalResult = this._interpretOrJit(\n        templateJitUrl(template.ngModule.type, template.compMeta), outputContext.statements);\n    const viewClass = evalResult[compileResult.viewClassVar];\n    const rendererType = evalResult[compileResult.rendererTypeVar];\n    template.compiled(viewClass, rendererType);\n  }\n\n  private _parseTemplate(\n      compMeta: CompileDirectiveMetadata, ngModule: CompileNgModuleMetadata,\n      directiveIdentifiers: CompileIdentifierMetadata[]):\n      {template: TemplateAst[], pipes: CompilePipeSummary[]} {\n    // Note: ! is ok here as components always have a template.\n    const preserveWhitespaces = compMeta.template !.preserveWhitespaces;\n    const directives =\n        directiveIdentifiers.map(dir => this._metadataResolver.getDirectiveSummary(dir.reference));\n    const pipes = ngModule.transitiveModule.pipes.map(\n        pipe => this._metadataResolver.getPipeSummary(pipe.reference));\n    return this._templateParser.parse(\n        compMeta,