Builds / serves multiple HTML files.

lib/src/compiler.dart

 // Copyright (c) 2015, 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.
 
 /// Command line tool to run the checker on a Dart program.
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert' show JSON;
 import 'dart:math' as math;
@@ skipping 286 matching lines @@
         scriptSource = context.sourceFactory.resolveUri(source, srcAttr);
       }
 
       if (scriptSource != null) {
         var lib = context.computeLibraryElement(scriptSource);
         _compileLibrary(lib, notifier);
         script.replaceWith(_linkLibraries(lib, loadedLibs, from: htmlOutDir));
       }
     }
 
-    new File(getOutputPath(source.uri)).openSync(mode: FileMode.WRITE)
-      ..writeStringSync(document.outerHtml)
-      ..writeStringSync('\n')
-      ..closeSync();
+    var outputFile = getOutputPath(source.uri);
+    new File(outputFile)
+      ..createSync(recursive: true)
+      ..writeAsStringSync(document.outerHtml + '\n');
   }
 
   html.DocumentFragment _linkLibraries(
       LibraryElement mainLib, LinkedHashSet<Uri> loaded,
       {String from}) {
     assert(from != null);
     var alreadyLoaded = loaded.length;
     _collectLibraries(mainLib, loaded);
 
     var newLibs = loaded.skip(alreadyLoaded);
@@ skipping 227 matching lines @@
   var files = [
     'harmony_feature_check.js',
     'dart_library.js',
     'dart/_runtime.js',
   ];
   files.addAll(corelibOrder.map(coreToFile));
   return files;
 }();
 
 final _log = new Logger('dev_compiler.src.compiler');