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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 */ (function (factory) { if (typeof module === "object" && typeof module.exports === "object") { var v = factory(require, exports); if (v !== undefined) module.exports = v; } else if (typeof define === "function" && define.amd) { define("@angular/compiler/src/directive_normalizer", ["require", "exports", "tslib", "@angular/compiler/src/compile_metadata", "@angular/compiler/src/config", "@angular/compiler/src/core", "@angular/compiler/src/ml_parser/ast", "@angular/compiler/src/ml_parser/interpolation_config", "@angular/compiler/src/style_url_resolver", "@angular/compiler/src/template_parser/template_preparser", "@angular/compiler/src/util"], factory); } })(function (require, exports) { "use strict"; Object.defineProperty(exports, "__esModule", { value: true }); var tslib_1 = require("tslib"); var compile_metadata_1 = require("@angular/compiler/src/compile_metadata"); var config_1 = require("@angular/compiler/src/config"); var core_1 = require("@angular/compiler/src/core"); var html = require("@angular/compiler/src/ml_parser/ast"); var interpolation_config_1 = require("@angular/compiler/src/ml_parser/interpolation_config"); var style_url_resolver_1 = require("@angular/compiler/src/style_url_resolver"); var template_preparser_1 = require("@angular/compiler/src/template_parser/template_preparser"); var util_1 = require("@angular/compiler/src/util"); var DirectiveNormalizer = /** @class */ (function () { function DirectiveNormalizer(_resourceLoader, _urlResolver, _htmlParser, _config) { this._resourceLoader = _resourceLoader; this._urlResolver = _urlResolver; this._htmlParser = _htmlParser; this._config = _config; this._resourceLoaderCache = new Map(); } DirectiveNormalizer.prototype.clearCache = function () { this._resourceLoaderCache.clear(); }; DirectiveNormalizer.prototype.clearCacheFor = function (normalizedDirective) { var _this = this; if (!normalizedDirective.isComponent) { return; } var template = normalizedDirective.template; this._resourceLoaderCache.delete(template.templateUrl); template.externalStylesheets.forEach(function (stylesheet) { _this._resourceLoaderCache.delete(stylesheet.moduleUrl); }); }; DirectiveNormalizer.prototype._fetch = function (url) { var result = this._resourceLoaderCache.get(url); if (!result) { result = this._resourceLoader.get(url); this._resourceLoaderCache.set(url, result); } return result; }; DirectiveNormalizer.prototype.normalizeTemplate = function (prenormData) { var _this = this; if (util_1.isDefined(prenormData.template)) { if (util_1.isDefined(prenormData.templateUrl)) { throw util_1.syntaxError("'" + util_1.stringify(prenormData.componentType) + "' component cannot define both template and templateUrl"); } if (typeof prenormData.template !== 'string') { throw util_1.syntaxError("The template specified for component " + util_1.stringify(prenormData.componentType) + " is not a string"); } } else if (util_1.isDefined(prenormData.templateUrl)) { if (typeof prenormData.templateUrl !== 'string') { throw util_1.syntaxError("The templateUrl specified for component " + util_1.stringify(prenormData.componentType) + " is not a string"); } } else { throw util_1.syntaxError("No template specified for component " + util_1.stringify(prenormData.componentType)); } if (util_1.isDefined(prenormData.preserveWhitespaces) && typeof prenormData.preserveWhitespaces !== 'boolean') { throw util_1.syntaxError("The preserveWhitespaces option for component " + util_1.stringify(prenormData.componentType) + " must be a boolean"); } return util_1.SyncAsync.then(this._preParseTemplate(prenormData), function (preparsedTemplate) { return _this._normalizeTemplateMetadata(prenormData, preparsedTemplate); }); }; DirectiveNormalizer.prototype._preParseTemplate = function (prenomData) { var _this = this; var template; var templateUrl; if (prenomData.template != null) { template = prenomData.template; templateUrl = prenomData.moduleUrl; } else { templateUrl = this._urlResolver.resolve(prenomData.moduleUrl, prenomData.templateUrl); template = this._fetch(templateUrl); } return util_1.SyncAsync.then(template, function (template) { return _this._preparseLoadedTemplate(prenomData, template, templateUrl); }); }; DirectiveNormalizer.prototype._preparseLoadedTemplate = function (prenormData, template, templateAbsUrl) { var isInline = !!prenormData.template; var interpolationConfig = interpolation_config_1.InterpolationConfig.fromArray(prenormData.interpolation); var rootNodesAndErrors = this._htmlParser.parse(template, compile_metadata_1.templateSourceUrl({ reference: prenormData.ngModuleType }, { type: { reference: prenormData.componentType } }, { isInline: isInline, templateUrl: templateAbsUrl }), true, interpolationConfig); if (rootNodesAndErrors.errors.length > 0) { var errorString = rootNodesAndErrors.errors.join('\n'); throw util_1.syntaxError("Template parse errors:\n" + errorString); } var templateMetadataStyles = this._normalizeStylesheet(new compile_metadata_1.CompileStylesheetMetadata({ styles: prenormData.styles, moduleUrl: prenormData.moduleUrl })); var visitor = new TemplatePreparseVisitor(); html.visitAll(visitor, rootNodesAndErrors.rootNodes); var templateStyles = this._normalizeStylesheet(new compile_metadata_1.CompileStylesheetMetadata({ styles: visitor.styles, styleUrls: visitor.styleUrls, moduleUrl: templateAbsUrl })); var styles = templateMetadataStyles.styles.concat(templateStyles.styles); var inlineStyleUrls = templateMetadataStyles.styleUrls.concat(templateStyles.styleUrls); var styleUrls = this ._normalizeStylesheet(new compile_metadata_1.CompileStylesheetMetadata({ styleUrls: prenormData.styleUrls, moduleUrl: prenormData.moduleUrl })) .styleUrls; return { template: template, templateUrl: templateAbsUrl, isInline: isInline, htmlAst: rootNodesAndErrors, styles: styles, inlineStyleUrls: inlineStyleUrls, styleUrls: styleUrls, ngContentSelectors: visitor.ngContentSelectors, }; }; DirectiveNormalizer.prototype._normalizeTemplateMetadata = function (prenormData, preparsedTemplate) { var _this = this; return util_1.SyncAsync.then(this._loadMissingExternalStylesheets(preparsedTemplate.styleUrls.concat(preparsedTemplate.inlineStyleUrls)), function (externalStylesheets) { return _this._normalizeLoadedTemplateMetadata(prenormData, preparsedTemplate, externalStylesheets); }); }; DirectiveNormalizer.prototype._normalizeLoadedTemplateMetadata = function (prenormData, preparsedTemplate, stylesheets) { // Algorithm: // - produce exactly 1 entry per original styleUrl in // CompileTemplateMetadata.externalStylesheets with all styles inlined // - inline all styles that are referenced by the template into CompileTemplateMetadata.styles. // Reason: be able to determine how many stylesheets there are even without loading // the template nor the stylesheets, so we can create a stub for TypeScript always synchronously // (as resource loading may be async) var _this = this; var styles = tslib_1.__spread(preparsedTemplate.styles); this._inlineStyles(preparsedTemplate.inlineStyleUrls, stylesheets, styles); var styleUrls = preparsedTemplate.styleUrls; var externalStylesheets = styleUrls.map(function (styleUrl) { var stylesheet = stylesheets.get(styleUrl); var styles = tslib_1.__spread(stylesheet.styles); _this._inlineStyles(stylesheet.styleUrls, stylesheets, styles); return new compile_metadata_1.CompileStylesheetMetadata({ moduleUrl: styleUrl, styles: styles }); }); var encapsulation = prenormData.encapsulation; if (encapsulation == null) { encapsulation = this._config.defaultEncapsulation; } if (encapsulation === core_1.ViewEncapsulation.Emulated && styles.length === 0 && styleUrls.length === 0) { encapsulation = core_1.ViewEncapsulation.None; } return new compile_metadata_1.CompileTemplateMetadata({ encapsulation: encapsulation, template: preparsedTemplate.template, templateUrl: preparsedTemplate.templateUrl, htmlAst: preparsedTemplate.htmlAst, styles: styles, styleUrls: styleUrls, ngContentSelectors: preparsedTemplate.ngContentSelectors, animations: prenormData.animations, interpolation: prenormData.interpolation, isInline: preparsedTemplate.isInline, externalStylesheets: externalStylesheets, preserveWhitespaces: config_1.preserveWhitespacesDefault(prenormData.preserveWhitespaces, this._config.preserveWhitespaces), }); }; DirectiveNormalizer.prototype._inlineStyles = function (styleUrls, stylesheets, targetStyles) { var _this = this; styleUrls.forEach(function (styleUrl) { var stylesheet = stylesheets.get(styleUrl); stylesheet.styles.forEach(function (style) { return targetStyles.push(style); }); _this._inlineStyles(stylesheet.styleUrls, stylesheets, targetStyles); }); }; DirectiveNormalizer.prototype._loadMissingExternalStylesheets = function (styleUrls, loadedStylesheets) { var _this = this; if (loadedStylesheets === void 0) { loadedStylesheets = new Map(); } return util_1.SyncAsync.then(util_1.SyncAsync.all(styleUrls.filter(function (styleUrl) { return !loadedStylesheets.has(styleUrl); }) .map(function (styleUrl) { return util_1.SyncAsync.then(_this._fetch(styleUrl), function (loadedStyle) { var stylesheet = _this._normalizeStylesheet(new compile_metadata_1.CompileStylesheetMetadata({ styles: [loadedStyle], moduleUrl: styleUrl })); loadedStylesheets.set(styleUrl, stylesheet); return _this._loadMissingExternalStylesheets(stylesheet.styleUrls, loadedStylesheets); }); })), function (_) { return loadedStylesheets; }); }; DirectiveNormalizer.prototype._normalizeStylesheet = function (stylesheet) { var _this = this; var moduleUrl = stylesheet.moduleUrl; var allStyleUrls = stylesheet.styleUrls.filter(style_url_resolver_1.isStyleUrlResolvable) .map(function (url) { return _this._urlResolver.resolve(moduleUrl, url); }); var allStyles = stylesheet.styles.map(function (style) { var styleWithImports = style_url_resolver_1.extractStyleUrls(_this._urlResolver, moduleUrl, style); allStyleUrls.push.apply(allStyleUrls, tslib_1.__spread(styleWithImports.styleUrls)); return styleWithImports.style; }); return new compile_metadata_1.CompileStylesheetMetadata({ styles: allStyles, styleUrls: allStyleUrls, moduleUrl: moduleUrl }); }; return DirectiveNormalizer; }()); exports.DirectiveNormalizer = DirectiveNormalizer; var TemplatePreparseVisitor = /** @class */ (function () { function TemplatePreparseVisitor() { this.ngContentSelectors = []; this.styles = []; this.styleUrls = []; this.ngNonBindableStackCount = 0; } TemplatePreparseVisitor.prototype.visitElement = function (ast, context) { var preparsedElement = template_preparser_1.preparseElement(ast); switch (preparsedElement.type) { case template_preparser_1.PreparsedElementType.NG_CONTENT: if (this.ngNonBindableStackCount === 0) { this.ngContentSelectors.push(preparsedElement.selectAttr); } break; case template_preparser_1.PreparsedElementType.STYLE: var textContent_1 = ''; ast.children.forEach(function (child) { if (child instanceof html.Text) { textContent_1 += child.value; } }); this.styles.push(textContent_1); break; case template_preparser_1.PreparsedElementType.STYLESHEET: this.styleUrls.push(preparsedElement.hrefAttr); break; default: break; } if (preparsedElement.nonBindable) { this.ngNonBindableStackCount++; } html.visitAll(this, ast.children); if (preparsedElement.nonBindable) { this.ngNonBindableStackCount--; } return null; }; TemplatePreparseVisitor.prototype.visitExpansion = function (ast, context) { html.visitAll(this, ast.cases); }; TemplatePreparseVisitor.prototype.visitExpansionCase = function (ast, context) { html.visitAll(this, ast.expression); }; TemplatePreparseVisitor.prototype.visitComment = function (ast, context) { return null; }; TemplatePreparseVisitor.prototype.visitAttribute = function (ast, context) { return null; }; TemplatePreparseVisitor.prototype.visitText = function (ast, context) { return null; }; return TemplatePreparseVisitor; }()); }); //# 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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, CompileStylesheetMetadata, CompileTemplateMetadata, templateSourceUrl} from './compile_metadata';\nimport {CompilerConfig, preserveWhitespacesDefault} from './config';\nimport {ViewEncapsulation} from './core';\nimport * as html from './ml_parser/ast';\nimport {HtmlParser} from './ml_parser/html_parser';\nimport {InterpolationConfig} from './ml_parser/interpolation_config';\nimport {ParseTreeResult as HtmlParseTreeResult} from './ml_parser/parser';\nimport {ResourceLoader} from './resource_loader';\nimport {extractStyleUrls, isStyleUrlResolvable} from './style_url_resolver';\nimport {PreparsedElementType, preparseElement} from './template_parser/template_preparser';\nimport {UrlResolver} from './url_resolver';\nimport {SyncAsync, isDefined, stringify, syntaxError} from './util';\n\nexport interface PrenormalizedTemplateMetadata {\n  ngModuleType: any;\n  componentType: any;\n  moduleUrl: string;\n  template: string|null;\n  templateUrl: string|null;\n  styles: string[];\n  styleUrls: string[];\n  interpolation: [string, string]|null;\n  encapsulation: ViewEncapsulation|null;\n  animations: any[];\n  preserveWhitespaces: boolean|null;\n}\n\nexport class DirectiveNormalizer {\n  private _resourceLoaderCache = new Map<string, SyncAsync<string>>();\n\n  constructor(\n      private _resourceLoader: ResourceLoader, private _urlResolver: UrlResolver,\n      private _htmlParser: HtmlParser, private _config: CompilerConfig) {}\n\n  clearCache(): void { this._resourceLoaderCache.clear(); }\n\n  clearCacheFor(normalizedDirective: CompileDirectiveMetadata): void {\n    if (!normalizedDirective.isComponent) {\n      return;\n    }\n    const template = normalizedDirective.template !;\n    this._resourceLoaderCache.delete(template.templateUrl !);\n    template.externalStylesheets.forEach(\n        (stylesheet) => { this._resourceLoaderCache.delete(stylesheet.moduleUrl !); });\n  }\n\n  private _fetch(url: string): SyncAsync<string> {\n    let result = this._resourceLoaderCache.get(url);\n    if (!result) {\n      result = this._resourceLoader.get(url);\n      this._resourceLoaderCache.set(url, result);\n    }\n    return result;\n  }\n\n  normalizeTemplate(prenormData: PrenormalizedTemplateMetadata):\n      SyncAsync<CompileTemplateMetadata> {\n    if (isDefined(prenormData.template)) {\n      if (isDefined(prenormData.templateUrl)) {\n        throw syntaxError(\n            `'${stringify(prenormData.componentType)}' component cannot define both template and templateUrl`);\n      }\n      if (typeof prenormData.template !== 'string') {\n        throw syntaxError(\n            `The template specified for component ${stringify(prenormData.componentType)} is not a string`);\n      }\n    } else if (isDefined(prenormData.templateUrl)) {\n      if (typeof prenormData.templateUrl !== 'string') {\n        throw syntaxError(\n            `The templateUrl specified for component ${stringify(prenormData.componentType)} is not a string`);\n      }\n    } else {\n      throw syntaxError(\n          `No template specified for component ${stringify(prenormData.componentType)}`);\n    }\n\n    if (isDefined(prenormData.preserveWhitespaces) &&\n        typeof prenormData.preserveWhitespaces !== 'boolean') {\n      throw syntaxError(\n          `The preserveWhitespaces option for component ${stringify(prenormData.componentType)} must be a boolean`);\n    }\n\n    return SyncAsync.then(\n        this._preParseTemplate(prenormData),\n        (preparsedTemplate) => this._normalizeTemplateMetadata(prenormData, preparsedTemplate));\n  }\n\n  private _preParseTemplate(prenomData: PrenormalizedTemplateMetadata):\n      SyncAsync<PreparsedTemplate> {\n    let template: SyncAsync<string>;\n    let templateUrl: string;\n    if (prenomData.template != null) {\n      template = prenomData.template;\n      templateUrl = prenomData.moduleUrl;\n    } else {\n      templateUrl = this._urlResolver.resolve(prenomData.moduleUrl, prenomData.templateUrl !);\n      template = this._fetch(templateUrl);\n    }\n    return SyncAsync.then(\n        template, (template) => this._preparseLoadedTemplate(prenomData, template, templateUrl));\n  }\n\n  private _preparseLoadedTemplate(\n      prenormData: PrenormalizedTemplateMetadata, template: string,\n      templateAbsUrl: string): PreparsedTemplate {\n    const isInline = !!prenormData.template;\n    const interpolationConfig = InterpolationConfig.fromArray(prenormData.interpolation !);\n    const rootNodesAndErrors = this._htmlParser.parse(\n        template,\n        templateSourceUrl(\n            {reference: prenormData.ngModuleType}, {type: {reference: prenormData.componentType}},\n            {isInline, templateUrl: templateAbsUrl}),\n        true, interpolationConfig);\n    if (rootNodesAndErrors.errors.length > 0) {\n      const errorString = rootNodesAndErrors.errors.join('\\n');\n      throw syntaxError(`Template parse errors:\\n${errorString}`);\n    }\n\n    const templateMetadataStyles = this._normalizeStylesheet(new CompileStylesheetMetadata(\n        {styles: prenormData.styles, moduleUrl: prenormData.moduleUrl}));\n\n    const visitor = new TemplatePreparseVisitor();\n    html.visitAll(visitor, rootNodesAndErrors.rootNodes);\n    const templateStyles = this._normalizeStylesheet(new CompileStylesheetMetadata(\n        {styles: visitor.styles, styleUrls: visitor.styleUrls, moduleUrl: templateAbsUrl}));\n\n    const styles = templateMetadataStyles.styles.concat(templateStyles.styles);\n\n    const inlineStyleUrls = templateMetadataStyles.styleUrls.concat(templateStyles.styleUrls);\n    const styleUrls = this\n                          ._normalizeStylesheet(new CompileStylesheetMetadata(\n                              {styleUrls: prenormData.styleUrls, moduleUrl: prenormData.moduleUrl}))\n                          .styleUrls;\n    return {\n      template,\n      templateUrl: templateAbsUrl, isInline,\n      htmlAst: rootNodesAndErrors, styles, inlineStyleUrls, styleUrls,\n      ngContentSelectors: visitor.ngContentSelectors,\n    };\n  }\n\n  private _normalizeTemplateMetadata(\n      prenormData: PrenormalizedTemplateMetadata,\n      preparsedTemplate: PreparsedTemplate): SyncAsync<CompileTemplateMetadata> {\n    return SyncAsync.then(\n        this._loadMissingExternalStylesheets(\n            preparsedTemplate.styleUrls.concat(preparsedTemplate.inlineStyleUrls)),\n        (externalStylesheets) => this._normalizeLoadedTemplateMetadata(\n            prenormData, preparsedTemplate, externalStylesheets));\n  }\n\n  private _normalizeLoadedTemplateMetadata(\n      prenormData: PrenormalizedTemplateMetadata, preparsedTemplate: PreparsedTemplate,\n      stylesheets: Map<string, CompileStylesheetMetadata>): CompileTemplateMetadata {\n    // Algorithm:\n    // - produce exactly 1 entry per original styleUrl in\n    // CompileTemplateMetadata.externalStylesheets with all styles inlined\n    // - inline all styles that are referenced by the template into CompileTemplateMetadata.styles.\n    // Reason: be able to determine how many stylesheets there are even without loading\n    // the template nor the stylesheets, so we can create a stub for TypeScript always synchronously\n    // (as resource loading may be async)\n\n    const styles = [...preparsedTemplate.styles];\n    this._inlineStyles(preparsedTemplate.inlineStyleUrls, stylesheets, styles);\n    const styleUrls = preparsedTemplate.styleUrls;\n\n    const externalStylesheets = styleUrls.map(styleUrl => {\n      const stylesheet = stylesheets.get(styleUrl) !;\n      const styles = [...stylesheet.styles];\n      this._inlineStyles(stylesheet.styleUrls, stylesheets, styles);\n      return new CompileStylesheetMetadata({moduleUrl: styleUrl, styles: styles});\n    });\n\n    let encapsulation = prenormData.encapsulation;\n    if (encapsulation == null) {\n      encapsulation = this._config.defaultEncapsulation;\n    }\n    if (encapsulation === ViewEncapsulation.Emulated && styles.length === 0 &&\n        styleUrls.length === 0) {\n      encapsulation = ViewEncapsulation.None;\n    }\n    return new CompileTemplateMetadata({\n      encapsulation,\n      template: preparsedTemplate.template,\n      templateUrl: preparsedTemplate.templateUrl,\n      htmlAst: preparsedTemplate.htmlAst, styles, styleUrls,\n      ngContentSelectors: preparsedTemplate.ngContentSelectors,\n      animations: prenormData.animations,\n      interpolation: prenormData.interpolation,\n      isInline: preparsedTemplate.isInline, externalStylesheets,\n      preserveWhitespaces: preserveWhitespacesDefault(\n          prenormData.preserveWhitespaces, this._config.preserveWhitespaces),\n    });\n  }\n\n  private _inlineStyles(\n      styleUrls: string[], stylesheets: Map<string, CompileStylesheetMetadata>,\n      targetStyles: string[]) {\n    styleUrls.forEach(styleUrl => {\n      const stylesheet = stylesheets.get(styleUrl) !;\n      stylesheet.styles.forEach(style => targetStyles.push(style));\n      this._inlineStyles(stylesheet.styleUrls, stylesheets, targetStyles);\n    });\n  }\n\n  private _loadMissingExternalStylesheets(\n      styleUrls: string[],\n      loadedStylesheets:\n          Map<string, CompileStylesheetMetadata> = new Map<string, CompileStylesheetMetadata>()):\n      SyncAsync<Map<string, CompileStylesheetMetadata>> {\n    return SyncAsync.then(\n        SyncAsync.all(styleUrls.filter((styleUrl) => !loadedStylesheets.has(styleUrl))\n                          .map(\n                              styleUrl => SyncAsync.then(\n                                  this._fetch(styleUrl),\n                                  (loadedStyle) => {\n                                    const stylesheet =\n                                        this._normalizeStylesheet(new CompileStylesheetMetadata(\n                                            {styles: [loadedStyle], moduleUrl: styleUrl}));\n                                    loadedStylesheets.set(styleUrl, stylesheet);\n                                    return this._loadMissingExternalStylesheets(\n                                        stylesheet.styleUrls, loadedStylesheets);\n                                  }))),\n        (_) => loadedStylesheets);\n  }\n\n  private _normalizeStylesheet(stylesheet: CompileStylesheetMetadata): CompileStylesheetMetadata {\n    const moduleUrl = stylesheet.moduleUrl !;\n    const allStyleUrls = stylesheet.styleUrls.filter(isStyleUrlResolvable)\n                             .map(url => this._urlResolver.resolve(moduleUrl, url));\n\n    const allStyles = stylesheet.styles.map(style => {\n      const styleWithImports = extractStyleUrls(this._urlResolver, moduleUrl, style);\n      allStyleUrls.push(...styleWithImports.styleUrls);\n      return styleWithImports.style;\n    });\n\n    return new CompileStylesheetMetadata(\n        {styles: allStyles, styleUrls: allStyleUrls, moduleUrl: moduleUrl});\n  }\n}\n\ninterface PreparsedTemplate {\n  template: string;\n  templateUrl: string;\n  isInline: boolean;\n  htmlAst: HtmlParseTreeResult;\n  styles: string[];\n  inlineStyleUrls: string[];\n  styleUrls: string[];\n  ngContentSelectors: string[];\n}\n\nclass TemplatePreparseVisitor implements html.Visitor {\n  ngContentSelectors: string[] = [];\n  styles: string[] = [];\n  styleUrls: string[] = [];\n  ngNonBindableStackCount: number = 0;\n\n  visitElement(ast: html.Element, context: any): any {\n    const preparsedElement = preparseElement(ast);\n    switch (preparsedElement.type) {\n      case PreparsedElementType.NG_CONTENT:\n        if (this.ngNonBindableStackCount === 0) {\n          this.ngContentSelectors.push(preparsedElement.selectAttr);\n        }\n        break;\n      case PreparsedElementType.STYLE:\n        let textContent = '';\n        ast.children.forEach(child => {\n          if (child instanceof html.Text) {\n            textContent += child.value;\n          }\n        });\n        this.styles.push(textContent);\n        break;\n      case PreparsedElementType.STYLESHEET:\n        this.styleUrls.push(preparsedElement.hrefAttr);\n        break;\n      default:\n        break;\n    }\n    if (preparsedElement.nonBindable) {\n      this.ngNonBindableStackCount++;\n    }\n    html.visitAll(this, ast.children);\n    if (preparsedElement.nonBindable) {\n      this.ngNonBindableStackCount--;\n    }\n    return null;\n  }\n\n  visitExpansion(ast: html.Expansion, context: any): any { html.visitAll(this, ast.cases); }\n\n  visitExpansionCase(ast: html.ExpansionCase, context: any): any {\n    html.visitAll(this, ast.expression);\n  }\n\n  visitComment(ast: html.Comment, context: any): any { return null; }\n  visitAttribute(ast: html.Attribute, context: any): any { return null; }\n  visitText(ast: html.Text, context: any): any { return null; }\n}\n"]}