Make dart2js work on Windows.

dart/utils/compiler/build_helper.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.
 
 #import('dart:io');
 #import('dart:uri');
 
+#import('../../lib/compiler/implementation/util/uri_extras.dart');
+#import('../../lib/compiler/implementation/filenames.dart');
+
 main() {
   List<String> arguments = new Options().arguments;
-  Uri uri = new Uri(scheme: 'file', path: '${arguments[0]}/');
-  String dartVmLocation = uri.resolve(arguments[1]).path;
-  Uri productionLauncher = uri.resolve(arguments[2]);
-  Uri developerLauncher = uri.resolve(arguments[3]);
-  String launcherScript = buildScript(uri);
+  Uri cwd = getCurrentDirectory();
+  String productDir = appendSlash(nativeToUriPath(arguments[0]));
+  String dartVmPath = nativeToUriPath(arguments[1]);
+  String productionName = nativeToUriPath(arguments[2]);
+  String developerName = nativeToUriPath(arguments[3]);
+  String dartDir = appendSlash(nativeToUriPath(arguments[4]));
 
-  writeScript(productionLauncher,
-              ['#!$dartVmLocation\n',
-               launcherScript]);
-  writeScript(developerLauncher,
-              ['#!$dartVmLocation --enable_checked_mode\n',
-               launcherScript]);
+  Uri dartUri = cwd.resolve(dartDir);
+  Uri productUri = cwd.resolve(productDir);
+
+  Uri dartVmUri = productUri.resolve(dartVmPath);
+  Uri productionUri = productUri.resolve(arguments[2]);
+  Uri developerUri = productUri.resolve(arguments[3]);
+  String productionScript = buildScript(dartUri, dartVmUri, '');
+  String developerScript = buildScript(dartUri, dartVmUri,
+                                       ' --enable_checked_mode');
+
+  writeScript(productionUri, productionScript);
+  writeScript(developerUri, developerScript);
 }
 
-writeScript(Uri uri, List<String> chunks) {
-  var f = new File(uri.path);
+writeScript(Uri uri, String script) {
+  var f = new File(uriPathToNative(uri.path));
   var stream = f.openSync(FileMode.WRITE);
-  for (String chunk in chunks) {
-    stream.writeStringSync(chunk);
+  try {
+    stream.writeStringSync(script);
+  } finally {
+    stream.closeSync();
   }
-  stream.closeSync();
 
   // TODO(ahe): Also make a .bat file for Windows.
 
   if (Platform.operatingSystem() != 'windows') {
     onExit(int exitCode, String stdout, String stderr) {
       if (exitCode != 0) {
         print(stdout);
         print(stderr);
         exit(exitCode);
       }
     }
     new Process.run('/bin/chmod', ['+x', uri.path], null, onExit);
   }
 }
 
-buildScript(Uri uri) {
-  String dart2jsPath =
-      uri.resolve('../../lib/compiler/implementation/dart2js.dart').path;
-  String libraryRoot = uri.resolve('../../').path;
+buildScript(Uri dartUri, Uri dartVmLocation, String options) {
+  Uri dart2jsUri = dartUri.resolve('lib/compiler/implementation/dart2js.dart');
+  String dart2jsPath = relativize(dartVmLocation, dart2jsUri);
+  String libraryRoot = relativize(dartVmLocation, dartUri);
+  libraryRoot = uriPathToNative('/../$libraryRoot');
+
+  print('dartUri = $dartUri');
+  print('dartVmLocation = $dartVmLocation');
+  print('dart2jsUri = $dart2jsUri');
+  print('dart2jsPath = $dart2jsPath');
+  print('libraryRoot = $libraryRoot');
+
   return """
+#!${dartVmLocation.path}$options
 // 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.
 
 #import('dart:io');
 
 #import('$dart2jsPath');
 
-class Helper {
-  void run() {
+void main() {
+  try {
+    String libraryRoot = @'$libraryRoot';
+    String script = new Options().script;
+    List<String> argv = ['--library-root=\$script\$libraryRoot'];
+    argv.addAll(new Options().arguments);
+    compile(argv);
+  } catch (var exception, var trace) {
     try {
-      List<String> argv = ['--library-root=$libraryRoot'];
-      argv.addAll(new Options().arguments);
-      compile(argv);
-    } catch (var exception, var trace) {
-      try {
-        print('Internal error: \$exception');
-      } catch (var ignored) {
-        print('Internal error: error while printing exception');
-      }
-      try {
-        print(trace);
-      } finally {
-        exit(253); // 253 is recognized as a crash by our test scripts.
-      }
+      print('Internal error: \$exception');
+    } catch (var ignored) {
+      print('Internal error: error while printing exception');
+    }
+    try {
+      print(trace);
+    } finally {
+      exit(253); // 253 is recognized as a crash by our test scripts.
     }
   }
 }
-
-void main() {
-  new Helper().run();
-}
 """;
 }