49 lines
2.0 KiB
TypeScript
49 lines
2.0 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. 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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// Some of the code comes from WebComponents.JS
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// https://github.com/webcomponents/webcomponentsjs/blob/master/src/HTMLImports/path.js
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import {UrlResolver} from './url_resolver';
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export class StyleWithImports {
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constructor(public style: string, public styleUrls: string[]) {}
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}
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export function isStyleUrlResolvable(url: string): boolean {
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if (url == null || url.length === 0 || url[0] == '/') return false;
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const schemeMatch = url.match(URL_WITH_SCHEMA_REGEXP);
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return schemeMatch === null || schemeMatch[1] == 'package' || schemeMatch[1] == 'asset';
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}
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/**
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* Rewrites stylesheets by resolving and removing the @import urls that
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* are either relative or don't have a `package:` scheme
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*/
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export function extractStyleUrls(
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resolver: UrlResolver, baseUrl: string, cssText: string): StyleWithImports {
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const foundUrls: string[] = [];
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const modifiedCssText = cssText.replace(CSS_STRIPPABLE_COMMENT_REGEXP, '')
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.replace(CSS_IMPORT_REGEXP, (...m: string[]) => {
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const url = m[1] || m[2];
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if (!isStyleUrlResolvable(url)) {
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// Do not attempt to resolve non-package absolute URLs with URI
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// scheme
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return m[0];
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}
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foundUrls.push(resolver.resolve(baseUrl, url));
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return '';
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});
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return new StyleWithImports(modifiedCssText, foundUrls);
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}
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const CSS_IMPORT_REGEXP = /@import\s+(?:url\()?\s*(?:(?:['"]([^'"]*))|([^;\)\s]*))[^;]*;?/g;
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const CSS_STRIPPABLE_COMMENT_REGEXP = /\/\*(?!#\s*(?:sourceURL|sourceMappingURL)=)[\s\S]+?\*\//g;
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const URL_WITH_SCHEMA_REGEXP = /^([^:/?#]+):/;
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