feat(compiler): use typescript for resolving resource paths

This can also be customized via the new method `resourceNameToFileName` in the
`CompilerHost`.

packages/compiler/src/aot/compiler_factory.ts

@@ -7,6 +7,7 @@
  */
 
 import {MissingTranslationStrategy, ViewEncapsulation, ɵConsole as Console} from '@angular/core';
+
 import {CompilerConfig} from '../config';
 import {DirectiveNormalizer} from '../directive_normalizer';
 import {DirectiveResolver} from '../directive_resolver';
@@ -22,7 +23,8 @@ import {PipeResolver} from '../pipe_resolver';
 import {DomElementSchemaRegistry} from '../schema/dom_element_schema_registry';
 import {StyleCompiler} from '../style_compiler';
 import {TemplateParser} from '../template_parser/template_parser';
-import {createOfflineCompileUrlResolver} from '../url_resolver';
+import {UrlResolver} from '../url_resolver';
+import {syntaxError} from '../util';
 import {ViewCompiler} from '../view_compiler/view_compiler';
 
 import {AotCompiler} from './compiler';
@@ -33,6 +35,19 @@ import {StaticSymbol, StaticSymbolCache} from './static_symbol';
 import {StaticSymbolResolver} from './static_symbol_resolver';
 import {AotSummaryResolver} from './summary_resolver';
 
+export function createAotUrlResolver(host: {
+  resourceNameToFileName(resourceName: string, containingFileName: string): string | null;
+}): UrlResolver {
+  return {
+    resolve: (basePath: string, url: string) => {
+      const filePath = host.resourceNameToFileName(url, basePath);
+      if (!filePath) {
+        throw syntaxError(`Couldn't resolve resource ${url} from ${basePath}`);
+      }
+      return filePath;
+    }
+  };
+}
 
 /**
  * Creates a new AotCompiler based on options and a host.
@@ -41,7 +56,7 @@ export function createAotCompiler(compilerHost: AotCompilerHost, options: AotCom
     {compiler: AotCompiler, reflector: StaticReflector} {
   let translations: string = options.translations || '';
 
-  const urlResolver = createOfflineCompileUrlResolver();
+  const urlResolver = createAotUrlResolver(compilerHost);
   const symbolCache = new StaticSymbolCache();
   const summaryResolver = new AotSummaryResolver(compilerHost, symbolCache);
   const symbolResolver = new StaticSymbolResolver(compilerHost, symbolCache, summaryResolver);

packages/compiler/src/aot/compiler_host.ts

@@ -14,6 +14,11 @@ import {AotSummaryResolverHost} from './summary_resolver';
  * services and from underlying file systems.
  */
 export interface AotCompilerHost extends StaticSymbolResolverHost, AotSummaryResolverHost {
+  /**
+   * Converts a path that refers to a resource into an absolute filePath
+   * that can be later on used for loading the resource via `loadResource.
+   */
+  resourceNameToFileName(resourceName: string, containingFileName: string): string|null;
   /**
    * Loads a resource (e.g. html / css)
    */