Beginning of CSS parser using frog parsering infrastructure.

utils/css/css.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.
+
+#library('css');
+
+#import('../../frog/lang.dart', prefix:'lang');
+#import('../../frog/file_system_memory.dart');
+
+#source('tokenkind.dart');
+#source('tokenizer.dart');
+#source('tree.dart');
+#source('cssselectorexception.dart');
+#source('cssworld.dart');
+#source('parser.dart');
+
+
+void initCssWorld() {
+  var fs = new MemoryFileSystem();
+  lang.parseOptions('', [], fs);
+  lang.initializeWorld(fs);
+  lang.world.process();
+  lang.world.resolveAll();
+
+  // TODO(terry): Should be set by arguments.  When run as a tool these aren't
+  // set when run internaly set these so we can compile CSS and catch any
+  // problems programmatically.
+  lang.options.throwOnErrors = true;
+  lang.options.throwOnFatal = true;
+}
+
+// TODO(terry): Add obfuscation mapping file.
+void cssParseAndValidate(String cssExpression, CssWorld world) {
+  Parser parser = new Parser(new lang.SourceFile(lang.SourceFile.IN_MEMORY_FILE,
+      cssExpression));
+  var tree = parser.template();
+  if (tree != null) {
+    parser.validateTemplate(tree.selectors, world);
+  }
+}
+
+// Returns pretty printed tree of the expression.
+String cssParseAndValidateDebug(String cssExpression, CssWorld world) {
+  Parser parser = new Parser(new lang.SourceFile(lang.SourceFile.IN_MEMORY_FILE,
+      cssExpression));
+  String output = "";
+  String prettyTree = "";
+  try {
+    var tree = parser.template();
+    if (tree != null) {
+      prettyTree = tree.toDebugString();
+      parser.validateTemplate(tree.selectors, world);
+      output = prettyTree;
+    }
+  } catch (var e) {
+    String error = e.toString();
+    output = "$error\n$prettyTree";
+    throw e;
+  }
+
+  return output;
+}