Beginning of CSS parser using frog parsering infrastructure.

frog/file_system_memory.dart

Index: frog/file_system_memory.dart
diff --git a/frog/file_system_memory.dart b/frog/file_system_memory.dart
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+// Copyright (c) 2011, 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('file_system_memory');
+
+#import('dart:dom');
+#import('file_system.dart');
+
+/**
+ * [FileSystem] implementation a memory buffer.
+ */
+class MemoryFileSystem implements FileSystem {
+  StringBuffer buffer;
+
+  MemoryFileSystem() : this.buffer = new StringBuffer();
+
+  void writeString(String outfile, String text) {
+    buffer.add(text);
+  }
+
+  String readAll(String filename) {
+    return buffer.toString();
+  }
+
+  bool fileExists(String filename) {
+    return true;
+  }
+}