Run dart2js directly from test.dart.

dart/lib/compiler/implementation/dart2js.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #library('dart2js');
 
 #import('dart:io');
 #import('dart:uri');
 #import('dart:utf');
 
 #import('../compiler.dart', prefix: 'api');
 #import('colors.dart');
 #import('source_file.dart');
 #import('filenames.dart');
 #import('util/uri_extras.dart');
 
 void compile(List<String> argv) {
   Uri cwd = getCurrentDirectory();
   bool throwOnError = false;
   bool showWarnings = true;
   bool verbose = false;
   Uri libraryRoot = cwd;
   Uri out = cwd.resolve('out.js');
+  List<String> options = new List<String>();
 
   List<String> arguments = <String>[];
   for (String argument in argv) {
     if ('--throw-on-error' == argument) {
       throwOnError = true;
     } else if ('--suppress-warnings' == argument) {
       showWarnings = false;
     } else if ('--verbose' == argument) {
       verbose = true;
     } else if (argument.startsWith('--library-root=')) {
       String path =
           nativeToUriPath(argument.substring(argument.indexOf('=') + 1));
       if (!path.endsWith("/")) path = "$path/";
       libraryRoot = cwd.resolve(path);
     } else if (argument.startsWith('--out=')) {
       String path =
           nativeToUriPath(argument.substring(argument.indexOf('=') + 1));
       out = cwd.resolve(path);
+    } else if (argument == '--allow-mock-compilation') {

[Bill Hesse, 2012/04/25 12:46:26]

constant on RHS of comparison disagrees with above lines.

[ahe, 2012/04/25 13:49:41]

Done.

+      options.add(argument);
     } else if (argument.startsWith('-')) {
-      throw new AbortLeg('unknown option $argument');
+      fail('Unknown option $argument.');
     } else {
       arguments.add(nativeToUriPath(argument));
     }
   }
   if (arguments.isEmpty()) {
-    throw new AbortLeg('no files to compile');
+    fail('No files to compile.');

[ngeoffray, 2012/04/25 12:24:54]

No files -> No file

[ahe, 2012/04/25 13:49:41]

Done.

   }
   if (arguments.length > 1) {
     var extra = arguments.getRange(1, arguments.length - 1);
-    throw new AbortLeg('extra arguments: $extra');
+    fail('Extra arguments: $extra.');
   }
 
   Map<String, SourceFile> sourceFiles = <SourceFile>{};
   int dartBytesRead = 0;
 
   Future<String> provider(Uri uri) {
     if (uri.scheme != 'file') {
       throw new IllegalArgumentException(uri);
     }
     String source = readAll(uriPathToNative(uri.path));
@@ skipping 22 matching lines @@
       print(file.getLocationMessage(message, begin, end, true));
     }
     if (fatal && throwOnError) throw new AbortLeg(message);
   }
 
   Uri uri = cwd.resolve(arguments[0]);
   info('compiling $uri');
 
   // TODO(ahe): We expect the future to be complete and call value
   // directly. In effect, we don't support truly asynchronous API.
-  String code = api.compile(uri, libraryRoot, provider, handler).value;
-  if (code === null) throw new AbortLeg('compilation failed');
+  String code = api.compile(uri, libraryRoot, provider, handler, options).value;
+  if (code === null) {
+    fail('Compilation failed.');
+  }
   writeString(out, code);
   int jsBytesWritten = code.length;
   info('compiled $dartBytesRead bytes Dart -> $jsBytesWritten bytes JS '
        + 'in ${relativize(cwd, out)}');
 }
 
 class AbortLeg {
   final message;
   AbortLeg(this.message);
   toString() => 'Aborted due to --throw-on-error: $message';
 }
 
 void writeString(Uri uri, String text) {
   if (uri.scheme != 'file') {
-    throw new AbortLeg('unhandled scheme ${uri.scheme}');
+    fail('Unhandled scheme ${uri.scheme}.');
   }
   var file = new File(uriPathToNative(uri.path)).openSync(FileMode.WRITE);
   file.writeStringSync(text);
   file.closeSync();
 }
 
 String readAll(String filename) {
   var file = (new File(filename)).openSync(FileMode.READ);
   var length = file.lengthSync();
   var buffer = new List<int>(length);
   var bytes = file.readListSync(buffer, 0, length);
   file.closeSync();
   return new String.fromCharCodes(new Utf8Decoder(buffer).decodeRest());
 }
+
+void fail(String message) {
+  print(message);
+  exit(1);
+}