Beginning of CSS parser using frog parsering infrastructure.

frog/css/cssparserexception.dart

+// 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.
+
+
+/** Can be thrown on any Css parser problem includes source location. */

[jimhug, 2011/11/09 16:04:03]

Any reason not to use CompilerException - possibly subclassing if you think the
Css part is important?

[terry, 2011/11/09 21:56:06]

Once I add lang.dart and world access then I'll set the options throwing flag to
use CompilerException.

Done.

+class CssParserException implements Exception {
+  final String _message;
+  final SourceSpan _location;
+
+  CssParserException(this._message, [this._location = null]);
+
+  String toString() {
+    if (_location != null) {
+      return 'CssParserException: ${_location.toMessageString(_message)}';
+    } else {
+      return 'CssParserException: $_message';
+    }
+  }
+
+}