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// Copyright (c) 2013, 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.
@Deprecated('Will be removed in v0.15.0')
library css;
import 'dart:io';
import 'package:args/args.dart';
import 'package:path/path.dart' as path;
import 'package:source_span/source_span.dart';
import 'parser.dart';
import 'src/messages.dart';
import 'visitor.dart';
void main(List<String> arguments) {
// TODO(jmesserly): fix this to return a proper exit code
var options = _parseOptions(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);
try {
// Read the file.
var filename = path.basename(inputPath);
var contents = new File(inputPath).readAsStringSync();
var file = new SourceFile.fromString(contents, url: path.toUri(inputPath));
// Parse the CSS.
StyleSheet tree = _time(
'Parse $filename', () => new Parser(file, contents).parse(), verbose);
_time('Analyzer $filename', () => new Analyzer([tree], messages), verbose)
// Emit the processed CSS.
var emitter = new CssPrinter();
_time('Codegen $filename', () => emitter.visitTree(tree, pretty: true),
// Write the contents to a file.
var outPath = path.join(path.dirname(inputPath), '_$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();
var result = callback();
final duration = watch.elapsedMilliseconds;
_printMessage(message, duration);
return result;
void _printMessage(String message, int duration) {
var buf = new StringBuffer();
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');
PreprocessorOptions _fromArgs(ArgResults args) => new PreprocessorOptions(
warningsAsErrors: args['warnings_as_errors'],
throwOnWarnings: args['throw_on_warnings'],
throwOnErrors: args['throw_on_errors'],
verbose: args['verbose'],
checked: args['checked'],
lessSupport: args['less'],
useColors: args['colors'],
polyfill: args['polyfill'],
inputFile: > 0 ?[0] : null);
// tool.dart [options...] <css file>
PreprocessorOptions _parseOptions(List<String> arguments) {
var parser = new ArgParser()
abbr: 'v',
defaultsTo: false,
negatable: false,
help: 'Display detail info')
defaultsTo: false,
negatable: false,
help: 'Validate CSS values invalid value display a warning message')
defaultsTo: true,
negatable: true,
help: 'Supports subset of Less syntax')
defaultsTo: true, help: 'Warnings not displayed')
defaultsTo: false, help: 'Warning handled as errors')
defaultsTo: false, help: 'Throw on errors encountered')
defaultsTo: false, help: 'Throw on warnings encountered')
defaultsTo: true, help: 'Display errors/warnings in colored text')
defaultsTo: false, help: 'Generate polyfill for new CSS features')
abbr: 'h',
defaultsTo: false,
negatable: false,
help: 'Displays this help message');
try {
var results = parser.parse(arguments);
if (results['help'] || == 0) {
return null;
return _fromArgs(results);
} on FormatException catch (e) {
return null;
void _showUsage(ArgParser parser) {
print('Usage: css [options...] input.css');