move csslib into dart svn

pkg/csslib/test/testing.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.
+
+/** Common definitions used for setting up the test environment. */
+library testing;
+
+import 'package:csslib/parser.dart';
+import 'package:csslib/visitor.dart';
+import 'package:csslib/src/messages.dart';
+
+useMockMessages() {
+  messages = new Messages(printHandler: (message) {});
+}
+
+/**
+ * Spin-up CSS parser in checked mode to detect any problematic CSS.  Normally,
+ * CSS will allow any property/value pairs regardless of validity; all of our
+ * tests (by default) will ensure that the CSS is really valid.
+ */
+StyleSheet parseCss(String cssInput, {List errors, List opts}) =>
+  parse(cssInput, errors: errors, options: opts == null ?
+      ['--no-colors', '--checked', '--warnings_as_errors', 'memory'] : opts);
+
+/**
+ * Spin-up CSS parser in checked mode to detect any problematic CSS.  Normally,
+ * CSS will allow any property/value pairs regardless of validity; all of our
+ * tests (by default) will ensure that the CSS is really valid.
+ */
+StyleSheet compileCss(String cssInput, {List errors, List opts}) =>
+  compile(cssInput, errors: errors, options: opts == null ?
+      ['--no-colors', '--checked', '--warnings_as_errors', 'memory'] : opts);
+
+/** CSS emitter walks the style sheet tree and emits readable CSS. */
+var _emitCss = new CssPrinter();
+
+/** Simple Visitor does nothing but walk tree. */
+var _cssVisitor = new Visitor();
+
+/** Pretty printer for CSS. */
+String prettyPrint(StyleSheet ss) {
+  // Walk the tree testing basic Vistor class.
+  walkTree(ss);
+  return (_emitCss..visitTree(ss, pretty: true)).toString();
+}
+
+/**
+ * Helper function to emit compact (non-pretty printed) CSS for suite test
+ * comparsions.  Spaces, new lines, etc. are reduced for easier comparsions of
+ * expected suite test results.
+ */
+String compactOuptut(StyleSheet ss) {
+  walkTree(ss);
+  return (_emitCss..visitTree(ss, pretty: false)).toString();
+}
+
+/** Walks the style sheet tree does nothing; insures the basic walker works. */
+void walkTree(StyleSheet ss) {
+  _cssVisitor..visitTree(ss);
+}
+
+String dumpTree(StyleSheet ss) => treeToDebugString(ss);
+
+