feat(compiler-cli): private i18n API for the CLI

modules/@angular/compiler-cli/integrationtest/ngtools_src/app.component.html

@@ -1,5 +1,5 @@
 <div>
-  <h1>hello world</h1>
+  <h1 i18n>hello world</h1>
   <a [routerLink]="['lazy']">lazy</a>
   <router-outlet></router-outlet>
 </div>

modules/@angular/compiler-cli/integrationtest/test/test_ngtools_api.ts

@@ -19,7 +19,6 @@ import {AngularCompilerOptions, CodeGenerator, CompilerHostContext, NodeCompiler
 
 const glob = require('glob');
 
-
 /**
  * Main method.
  * Standalone program that executes codegen using the ngtools API and tests that files were
@@ -30,6 +29,7 @@ function main() {
 
   Promise.resolve()
       .then(() => codeGenTest())
+      .then(() => i18nTest())
       .then(() => lazyRoutesTest())
       .then(() => {
         console.log('All done!');
@@ -42,7 +42,6 @@ function main() {
       });
 }
 
-
 function codeGenTest() {
   const basePath = path.join(__dirname, '../ngtools_src');
   const project = path.join(basePath, 'tsconfig-build.json');
@@ -109,6 +108,67 @@ function codeGenTest() {
       });
 }
 
+function i18nTest() {
+  const basePath = path.join(__dirname, '../ngtools_src');
+  const project = path.join(basePath, 'tsconfig-build.json');
+  const readResources: string[] = [];
+  const wroteFiles: string[] = [];
+
+  const config = tsc.readConfiguration(project, basePath);
+  const hostContext = new NodeCompilerHostContext();
+  const delegateHost = ts.createCompilerHost(config.parsed.options, true);
+  const host: ts.CompilerHost = Object.assign(
+      {}, delegateHost,
+      {writeFile: (fileName: string, ...rest: any[]) => { wroteFiles.push(fileName); }});
+  const program = ts.createProgram(config.parsed.fileNames, config.parsed.options, host);
+
+  config.ngOptions.basePath = basePath;
+
+  console.log(`>>> running i18n extraction for ${project}`);
+  return __NGTOOLS_PRIVATE_API_2
+      .extractI18n({
+        basePath,
+        compilerOptions: config.parsed.options, program, host,
+        angularCompilerOptions: config.ngOptions,
+        i18nFormat: 'xlf',
+        readResource: (fileName: string) => {
+          readResources.push(fileName);
+          return hostContext.readResource(fileName);
+        },
+      })
+      .then(() => {
+        console.log(`>>> i18n extraction done, asserting read and wrote files`);
+
+        const allFiles = glob.sync(path.join(basePath, '**/*'), {nodir: true});
+
+        assert(wroteFiles.length == 1, `Expected a single message bundle file.`);
+
+        assert(
+            wroteFiles[0].endsWith('/ngtools_src/messages.xlf'),
+            `Expected the bundle file to be "message.xlf".`);
+
+        allFiles.forEach((fileName: string) => {
+          // Skip tsconfig.
+          if (fileName.match(/tsconfig-build.json$/)) {
+            return;
+          }
+
+          // Assert that file was read.
+          if (fileName.match(/\.css$/) || fileName.match(/\.html$/)) {
+            assert(
+                readResources.indexOf(fileName) != -1,
+                `Expected resource "${fileName}" to be read.`);
+          }
+        });
+
+        console.log(`done, no errors.`);
+      })
+      .catch((e: any) => {
+        console.error(e.stack);
+        console.error('Extraction failed');
+        throw e;
+      });
+}
 
 function lazyRoutesTest() {
   const basePath = path.join(__dirname, '../ngtools_src');

modules/@angular/compiler-cli/src/extract_i18n.ts

@@ -14,41 +14,15 @@
 // Must be imported first, because angular2 decorators throws on load.
 import 'reflect-metadata';
 
-import * as compiler from '@angular/compiler';
 import * as tsc from '@angular/tsc-wrapped';
-import * as path from 'path';
 import * as ts from 'typescript';
 
 import {Extractor} from './extractor';
 
 function extract(
     ngOptions: tsc.AngularCompilerOptions, cliOptions: tsc.I18nExtractionCliOptions,
-    program: ts.Program, host: ts.CompilerHost) {
-  const extractor = Extractor.create(ngOptions, cliOptions.i18nFormat, program, host);
-
-  const bundlePromise: Promise<compiler.MessageBundle> = extractor.extract();
-
-  return (bundlePromise).then(messageBundle => {
-    let ext: string;
-    let serializer: compiler.Serializer;
-    const format = (cliOptions.i18nFormat || 'xlf').toLowerCase();
-
-    switch (format) {
-      case 'xmb':
-        ext = 'xmb';
-        serializer = new compiler.Xmb();
-        break;
-      case 'xliff':
-      case 'xlf':
-      default:
-        ext = 'xlf';
-        serializer = new compiler.Xliff();
-        break;
-    }
-
-    const dstPath = path.join(ngOptions.genDir, `messages.${ext}`);
-    host.writeFile(dstPath, messageBundle.write(serializer), false);
-  });
+    program: ts.Program, host: ts.CompilerHost): Promise<void> {
+  return Extractor.create(ngOptions, program, host).extract(cliOptions.i18nFormat);
 }
 
 // Entry point

modules/@angular/compiler-cli/src/extractor.ts

@@ -15,27 +15,70 @@ import 'reflect-metadata';
 
 import * as compiler from '@angular/compiler';
 import * as tsc from '@angular/tsc-wrapped';
+import * as path from 'path';
 import * as ts from 'typescript';
 
-import {CompilerHost, ModuleResolutionHostAdapter} from './compiler_host';
+import {CompilerHost, CompilerHostContext, ModuleResolutionHostAdapter} from './compiler_host';
+import {PathMappedCompilerHost} from './path_mapped_compiler_host';
 
 export class Extractor {
   constructor(
-      private ngExtractor: compiler.Extractor, private ngCompilerHost: CompilerHost,
+      private options: tsc.AngularCompilerOptions, private ngExtractor: compiler.Extractor,
+      public host: ts.CompilerHost, private ngCompilerHost: CompilerHost,
       private program: ts.Program) {}
 
-  extract(): Promise<compiler.MessageBundle> {
-    return this.ngExtractor.extract(this.program.getSourceFiles().map(
-        sf => this.ngCompilerHost.getCanonicalFileName(sf.fileName)));
+  extract(formatName: string): Promise<void> {
+    // Checks the format and returns the extension
+    const ext = this.getExtension(formatName);
+
+    const files = this.program.getSourceFiles().map(
+        sf => this.ngCompilerHost.getCanonicalFileName(sf.fileName));
+
+    const promiseBundle = this.ngExtractor.extract(files);
+
+    return promiseBundle.then(bundle => {
+      const content = this.serialize(bundle, ext);
+      const dstPath = path.join(this.options.genDir, `messages.${ext}`);
+      this.host.writeFile(dstPath, content, false);
+    });
+  }
+
+  serialize(bundle: compiler.MessageBundle, ext: string): string {
+    let serializer: compiler.Serializer;
+
+    switch (ext) {
+      case 'xmb':
+        serializer = new compiler.Xmb();
+        break;
+      case 'xlf':
+      default:
+        serializer = new compiler.Xliff();
+    }
+
+    return bundle.write(serializer);
+  }
+
+  getExtension(formatName: string): string {
+    const format = (formatName || 'xlf').toLowerCase();
+
+    if (format === 'xmb') return 'xmb';
+    if (format === 'xlf' || format === 'xlif') return 'xlf';
+
+    throw new Error('Unsupported format "${formatName}"');
   }
 
   static create(
-      options: tsc.AngularCompilerOptions, translationsFormat: string, program: ts.Program,
-      moduleResolverHost: ts.ModuleResolutionHost, ngCompilerHost?: CompilerHost): Extractor {
-    if (!ngCompilerHost)
-      ngCompilerHost =
-          new CompilerHost(program, options, new ModuleResolutionHostAdapter(moduleResolverHost));
+      options: tsc.AngularCompilerOptions, program: ts.Program, tsCompilerHost: ts.CompilerHost,
+      compilerHostContext?: CompilerHostContext, ngCompilerHost?: CompilerHost): Extractor {
+    if (!ngCompilerHost) {
+      const usePathMapping = !!options.rootDirs && options.rootDirs.length > 0;
+      const context = compilerHostContext || new ModuleResolutionHostAdapter(tsCompilerHost);
+      ngCompilerHost = usePathMapping ? new PathMappedCompilerHost(program, options, context) :
+                                        new CompilerHost(program, options, context);
+    }
+
     const {extractor: ngExtractor} = compiler.Extractor.create(ngCompilerHost);
-    return new Extractor(ngExtractor, ngCompilerHost, program);
+
+    return new Extractor(options, ngExtractor, tsCompilerHost, ngCompilerHost, program);
   }
 }

modules/@angular/compiler-cli/src/ngtools_api.ts

@@ -19,10 +19,10 @@ import * as ts from 'typescript';
 
 import {CodeGenerator} from './codegen';
 import {CompilerHost, CompilerHostContext, ModuleResolutionHostAdapter} from './compiler_host';
+import {Extractor} from './extractor';
 import {listLazyRoutesOfModule} from './ngtools_impl';
 import {PathMappedCompilerHost} from './path_mapped_compiler_host';
 
-
 export interface NgTools_InternalApi_NG2_CodeGen_Options {
   basePath: string;
   compilerOptions: ts.CompilerOptions;
@@ -50,9 +50,18 @@ export interface NgTools_InternalApi_NG2_ListLazyRoutes_Options {
   // Every new property under this line should be optional.
 }
 
-
 export interface NgTools_InternalApi_NG_2_LazyRouteMap { [route: string]: string; }
 
+export interface NgTools_InternalApi_NG2_ExtractI18n_Options {
+  basePath: string;
+  compilerOptions: ts.CompilerOptions;
+  program: ts.Program;
+  host: ts.CompilerHost;
+  angularCompilerOptions: AngularCompilerOptions;
+  i18nFormat: string;
+  readResource: (fileName: string) => Promise<string>;
+  // Every new property under this line should be optional.
+}
 
 /**
  * A ModuleResolutionHostAdapter that overrides the readResource() method with the one
@@ -94,7 +103,6 @@ export class NgTools_InternalApi_NG_2 {
     return codeGenerator.codegen();
   }
 
-
   /**
    * @internal
    * @private
@@ -124,4 +132,19 @@ export class NgTools_InternalApi_NG_2 {
         },
         {});
   }
+
+  /**
+   * @internal
+   * @private
+   */
+  static extractI18n(options: NgTools_InternalApi_NG2_ExtractI18n_Options): Promise<void> {
+    const hostContext: CompilerHostContext =
+        new CustomLoaderModuleResolutionHostAdapter(options.readResource, options.host);
+
+    // Create the i18n extractor.
+    const extractor = Extractor.create(
+        options.angularCompilerOptions, options.program, options.host, hostContext);
+
+    return extractor.extract(options.i18nFormat);
+  }
 }

modules/@angular/compiler/src/i18n/extractor.ts

@@ -28,7 +28,6 @@ import {InterpolationConfig} from '../ml_parser/interpolation_config';
 import {NgModuleResolver} from '../ng_module_resolver';
 import {ParseError} from '../parse_util';
 import {PipeResolver} from '../pipe_resolver';
-import {Console} from '../private_import_core';
 import {DomElementSchemaRegistry} from '../schema/dom_element_schema_registry';
 import {createOfflineCompileUrlResolver} from '../url_resolver';