refactor: move angular source to /packages rather than modules/@angular

packages/compiler/src/style_url_resolver.ts

@@ -0,0 +1,47 @@
+/**
+ * @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
+ */
+
+// Some of the code comes from WebComponents.JS
+// https://github.com/webcomponents/webcomponentsjs/blob/master/src/HTMLImports/path.js
+
+import {UrlResolver} from './url_resolver';
+
+export class StyleWithImports {
+  constructor(public style: string, public styleUrls: string[]) {}
+}
+
+export function isStyleUrlResolvable(url: string): boolean {
+  if (url == null || url.length === 0 || url[0] == '/') return false;
+  const schemeMatch = url.match(URL_WITH_SCHEMA_REGEXP);
+  return schemeMatch === null || schemeMatch[1] == 'package' || schemeMatch[1] == 'asset';
+}
+
+/**
+ * Rewrites stylesheets by resolving and removing the @import urls that
+ * are either relative or don't have a `package:` scheme
+ */
+export function extractStyleUrls(
+    resolver: UrlResolver, baseUrl: string, cssText: string): StyleWithImports {
+  const foundUrls: string[] = [];
+
+  const modifiedCssText =
+      cssText.replace(CSS_COMMENT_REGEXP, '').replace(CSS_IMPORT_REGEXP, (...m: string[]) => {
+        const url = m[1] || m[2];
+        if (!isStyleUrlResolvable(url)) {
+          // Do not attempt to resolve non-package absolute URLs with URI scheme
+          return m[0];
+        }
+        foundUrls.push(resolver.resolve(baseUrl, url));
+        return '';
+      });
+  return new StyleWithImports(modifiedCssText, foundUrls);
+}
+
+const CSS_IMPORT_REGEXP = /@import\s+(?:url\()?\s*(?:(?:['"]([^'"]*))|([^;\)\s]*))[^;]*;?/g;
+const CSS_COMMENT_REGEXP = /\/\*.+?\*\//g;
+const URL_WITH_SCHEMA_REGEXP = /^([^:/?#]+):/;