@angular/compiler
Version:
Angular - the compiler library
215 lines • 40.5 kB
JavaScript
/**
* @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 { CompileStylesheetMetadata, CompileTemplateMetadata, templateSourceUrl } from './compile_metadata';
import { preserveWhitespacesDefault } from './config';
import { ViewEncapsulation } from './core';
import * as html from './ml_parser/ast';
import { InterpolationConfig } from './ml_parser/interpolation_config';
import { extractStyleUrls, isStyleUrlResolvable } from './style_url_resolver';
import { PreparsedElementType, preparseElement } from './template_parser/template_preparser';
import { SyncAsync, isDefined, stringify, syntaxError } from './util';
export class DirectiveNormalizer {
constructor(_resourceLoader, _urlResolver, _htmlParser, _config) {
this._resourceLoader = _resourceLoader;
this._urlResolver = _urlResolver;
this._htmlParser = _htmlParser;
this._config = _config;
this._resourceLoaderCache = new Map();
}
clearCache() { this._resourceLoaderCache.clear(); }
clearCacheFor(normalizedDirective) {
if (!normalizedDirective.isComponent) {
return;
}
const template = normalizedDirective.template;
this._resourceLoaderCache.delete(template.templateUrl);
template.externalStylesheets.forEach((stylesheet) => { this._resourceLoaderCache.delete(stylesheet.moduleUrl); });
}
_fetch(url) {
let result = this._resourceLoaderCache.get(url);
if (!result) {
result = this._resourceLoader.get(url);
this._resourceLoaderCache.set(url, result);
}
return result;
}
normalizeTemplate(prenormData) {
if (isDefined(prenormData.template)) {
if (isDefined(prenormData.templateUrl)) {
throw syntaxError(`'${stringify(prenormData.componentType)}' component cannot define both template and templateUrl`);
}
if (typeof prenormData.template !== 'string') {
throw syntaxError(`The template specified for component ${stringify(prenormData.componentType)} is not a string`);
}
}
else if (isDefined(prenormData.templateUrl)) {
if (typeof prenormData.templateUrl !== 'string') {
throw syntaxError(`The templateUrl specified for component ${stringify(prenormData.componentType)} is not a string`);
}
}
else {
throw syntaxError(`No template specified for component ${stringify(prenormData.componentType)}`);
}
if (isDefined(prenormData.preserveWhitespaces) &&
typeof prenormData.preserveWhitespaces !== 'boolean') {
throw syntaxError(`The preserveWhitespaces option for component ${stringify(prenormData.componentType)} must be a boolean`);
}
return SyncAsync.then(this._preParseTemplate(prenormData), (preparsedTemplate) => this._normalizeTemplateMetadata(prenormData, preparsedTemplate));
}
_preParseTemplate(prenomData) {
let template;
let templateUrl;
if (prenomData.template != null) {
template = prenomData.template;
templateUrl = prenomData.moduleUrl;
}
else {
templateUrl = this._urlResolver.resolve(prenomData.moduleUrl, prenomData.templateUrl);
template = this._fetch(templateUrl);
}
return SyncAsync.then(template, (template) => this._preparseLoadedTemplate(prenomData, template, templateUrl));
}
_preparseLoadedTemplate(prenormData, template, templateAbsUrl) {
const isInline = !!prenormData.template;
const interpolationConfig = InterpolationConfig.fromArray(prenormData.interpolation);
const rootNodesAndErrors = this._htmlParser.parse(template, templateSourceUrl({ reference: prenormData.ngModuleType }, { type: { reference: prenormData.componentType } }, { isInline, templateUrl: templateAbsUrl }), true, interpolationConfig);
if (rootNodesAndErrors.errors.length > 0) {
const errorString = rootNodesAndErrors.errors.join('\n');
throw syntaxError(`Template parse errors:\n${errorString}`);
}
const templateMetadataStyles = this._normalizeStylesheet(new CompileStylesheetMetadata({ styles: prenormData.styles, moduleUrl: prenormData.moduleUrl }));
const visitor = new TemplatePreparseVisitor();
html.visitAll(visitor, rootNodesAndErrors.rootNodes);
const templateStyles = this._normalizeStylesheet(new CompileStylesheetMetadata({ styles: visitor.styles, styleUrls: visitor.styleUrls, moduleUrl: templateAbsUrl }));
const styles = templateMetadataStyles.styles.concat(templateStyles.styles);
const inlineStyleUrls = templateMetadataStyles.styleUrls.concat(templateStyles.styleUrls);
const styleUrls = this
._normalizeStylesheet(new CompileStylesheetMetadata({ styleUrls: prenormData.styleUrls, moduleUrl: prenormData.moduleUrl }))
.styleUrls;
return {
template,
templateUrl: templateAbsUrl, isInline,
htmlAst: rootNodesAndErrors, styles, inlineStyleUrls, styleUrls,
ngContentSelectors: visitor.ngContentSelectors,
};
}
_normalizeTemplateMetadata(prenormData, preparsedTemplate) {
return SyncAsync.then(this._loadMissingExternalStylesheets(preparsedTemplate.styleUrls.concat(preparsedTemplate.inlineStyleUrls)), (externalStylesheets) => this._normalizeLoadedTemplateMetadata(prenormData, preparsedTemplate, externalStylesheets));
}
_normalizeLoadedTemplateMetadata(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)
const styles = [...preparsedTemplate.styles];
this._inlineStyles(preparsedTemplate.inlineStyleUrls, stylesheets, styles);
const styleUrls = preparsedTemplate.styleUrls;
const externalStylesheets = styleUrls.map(styleUrl => {
const stylesheet = stylesheets.get(styleUrl);
const styles = [...stylesheet.styles];
this._inlineStyles(stylesheet.styleUrls, stylesheets, styles);
return new CompileStylesheetMetadata({ moduleUrl: styleUrl, styles: styles });
});
let encapsulation = prenormData.encapsulation;
if (encapsulation == null) {
encapsulation = this._config.defaultEncapsulation;
}
if (encapsulation === ViewEncapsulation.Emulated && styles.length === 0 &&
styleUrls.length === 0) {
encapsulation = ViewEncapsulation.None;
}
return new CompileTemplateMetadata({
encapsulation,
template: preparsedTemplate.template,
templateUrl: preparsedTemplate.templateUrl,
htmlAst: preparsedTemplate.htmlAst, styles, styleUrls,
ngContentSelectors: preparsedTemplate.ngContentSelectors,
animations: prenormData.animations,
interpolation: prenormData.interpolation,
isInline: preparsedTemplate.isInline, externalStylesheets,
preserveWhitespaces: preserveWhitespacesDefault(prenormData.preserveWhitespaces, this._config.preserveWhitespaces),
});
}
_inlineStyles(styleUrls, stylesheets, targetStyles) {
styleUrls.forEach(styleUrl => {
const stylesheet = stylesheets.get(styleUrl);
stylesheet.styles.forEach(style => targetStyles.push(style));
this._inlineStyles(stylesheet.styleUrls, stylesheets, targetStyles);
});
}
_loadMissingExternalStylesheets(styleUrls, loadedStylesheets = new Map()) {
return SyncAsync.then(SyncAsync.all(styleUrls.filter((styleUrl) => !loadedStylesheets.has(styleUrl))
.map(styleUrl => SyncAsync.then(this._fetch(styleUrl), (loadedStyle) => {
const stylesheet = this._normalizeStylesheet(new CompileStylesheetMetadata({ styles: [loadedStyle], moduleUrl: styleUrl }));
loadedStylesheets.set(styleUrl, stylesheet);
return this._loadMissingExternalStylesheets(stylesheet.styleUrls, loadedStylesheets);
}))), (_) => loadedStylesheets);
}
_normalizeStylesheet(stylesheet) {
const moduleUrl = stylesheet.moduleUrl;
const allStyleUrls = stylesheet.styleUrls.filter(isStyleUrlResolvable)
.map(url => this._urlResolver.resolve(moduleUrl, url));
const allStyles = stylesheet.styles.map(style => {
const styleWithImports = extractStyleUrls(this._urlResolver, moduleUrl, style);
allStyleUrls.push(...styleWithImports.styleUrls);
return styleWithImports.style;
});
return new CompileStylesheetMetadata({ styles: allStyles, styleUrls: allStyleUrls, moduleUrl: moduleUrl });
}
}
class TemplatePreparseVisitor {
constructor() {
this.ngContentSelectors = [];
this.styles = [];
this.styleUrls = [];
this.ngNonBindableStackCount = 0;
}
visitElement(ast, context) {
const preparsedElement = preparseElement(ast);
switch (preparsedElement.type) {
case PreparsedElementType.NG_CONTENT:
if (this.ngNonBindableStackCount === 0) {
this.ngContentSelectors.push(preparsedElement.selectAttr);
}
break;
case PreparsedElementType.STYLE:
let textContent = '';
ast.children.forEach(child => {
if (child instanceof html.Text) {
textContent += child.value;
}
});
this.styles.push(textContent);
break;
case 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;
}
visitExpansion(ast, context) { html.visitAll(this, ast.cases); }
visitExpansionCase(ast, context) {
html.visitAll(this, ast.expression);
}
visitComment(ast, context) { return null; }
visitAttribute(ast, context) { return null; }
visitText(ast, context) { return null; }
}
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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"]}