move csslib into dart svn

pkg/csslib/lib/css.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.
+
+library css;
+
+import 'dart:async';
+import 'dart:collection';
+import 'dart:io';
+import 'dart:math' as Math;
+
+import 'package:path/path.dart' as path;
+import 'package:source_maps/span.dart' show SourceFile;
+
+import 'parser.dart';
+import 'visitor.dart';
+import 'src/messages.dart';
+import 'src/options.dart';
+
+void main() {
+  // TODO(jmesserly): fix this to return a proper exit code
+  var options = PreprocessorOptions.parse(new Options().arguments);
+  if (options == null) return;
+
+  messages = new Messages(options: options);
+
+  _time('Total time spent on ${options.inputFile}', () {
+    _compile(options.inputFile, options.verbose);
+  }, true);
+}
+
+void _compile(String inputPath, bool verbose) {
+  var ext = path.extension(inputPath);
+  if (ext != '.css' && ext != '.scss') {
+    messages.error("Please provide a CSS/Sass file", null);
+    return;
+  }
+  try {
+    // Read the file.
+    var filename = path.basename(inputPath);
+    var contents = new File(inputPath).readAsStringSync();
+    var file = new SourceFile.text(inputPath, contents);
+
+    // Parse the CSS.
+    var tree = _time('Parse $filename',
+        () => new Parser(file, contents).parse(), verbose);
+
+    _time('Analyzer $filename',
+        () => new Analyzer([tree], messages), verbose).run();
+
+    // Emit the processed CSS.
+    var emitter = new CssPrinter();
+    _time('Codegen $filename',
+        () => emitter.visitTree(tree, pretty: true), verbose);
+
+    // Write the contents to a file.
+    var outPath = path.join(path.dirname(inputPath), '_$filename');
+    new File(outPath).writeAsStringSync(emitter.toString());
+  } catch (e) {
+    messages.error('error processing $inputPath. Original message:\n $e', null);
+  }
+}
+
+_time(String message, callback(), bool printTime) {
+  if (!printTime) return callback();
+  final watch = new Stopwatch();
+  watch.start();
+  var result = callback();
+  watch.stop();
+  final duration = watch.elapsedMilliseconds;
+  _printMessage(message, duration);
+  return result;
+}
+
+void _printMessage(String message, int duration) {
+  var buf = new StringBuffer();
+  buf.write(message);
+  for (int i = message.length; i < 60; i++) buf.write(' ');
+  buf.write(' -- ');
+  if (duration < 10) buf.write(' ');
+  if (duration < 100) buf.write(' ');
+  buf..write(duration)..write(' ms');
+  print(buf.toString());
+}