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csslib/lib/src/options.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 csslib.src.options;
-
-import 'package:args/args.dart';
-
-class PreprocessorOptions {
-  /** Generate polyfill code (e.g., var, etc.) */
-  final bool polyfill;
-
-  /** Report warnings as errors. */
-  final bool warningsAsErrors;
-
-  /** Throw an exception on warnings (not used by command line tool). */
-  final bool throwOnWarnings;
-
-  /** Throw an exception on errors (not used by command line tool). */
-  final bool throwOnErrors;
-
-  /** True to show informational messages. The `--verbose` flag. */
-  final bool verbose;
-
-  /** True to show warning messages for bad CSS.  The '--checked' flag. */
-  final bool checked;
-
-  // TODO(terry): Add mixin support and nested rules.
-  /**
-   * Subset of Less commands enabled; disable with '--no-less'.
-   * Less syntax supported:
-   * - @name at root level statically defines variables resolved at compilation
-   * time.  Essentially a directive e.g., @var-name.
-   */
-  final bool lessSupport;
-
-  /** Whether to use colors to print messages on the terminal. */
-  final bool useColors;
-
-  /** File to process by the compiler. */
-  final String inputFile;
-
-  const PreprocessorOptions({this.verbose: false, this.checked: false,
-      this.lessSupport: true, this.warningsAsErrors: false,
-      this.throwOnErrors: false, this.throwOnWarnings: false,
-      this.useColors: true, this.polyfill: false, this.inputFile});
-
-  PreprocessorOptions.fromArgs(ArgResults args)
-      : 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 = args.rest.length > 0 ? args.rest[0] : null;
-
-  // tool.dart [options...] <css file>
-  static PreprocessorOptions parse(List<String> arguments) {
-    var parser = new ArgParser()
-      ..addFlag('verbose',
-          abbr: 'v',
-          defaultsTo: false,
-          negatable: false,
-          help: 'Display detail info')
-      ..addFlag('checked',
-          defaultsTo: false,
-          negatable: false,
-          help: 'Validate CSS values invalid value display a warning message')
-      ..addFlag('less',
-          defaultsTo: true,
-          negatable: true,
-          help: 'Supports subset of Less syntax')
-      ..addFlag('suppress_warnings',
-          defaultsTo: true, help: 'Warnings not displayed')
-      ..addFlag('warnings_as_errors',
-          defaultsTo: false, help: 'Warning handled as errors')
-      ..addFlag('throw_on_errors',
-          defaultsTo: false, help: 'Throw on errors encountered')
-      ..addFlag('throw_on_warnings',
-          defaultsTo: false, help: 'Throw on warnings encountered')
-      ..addFlag('colors',
-          defaultsTo: true, help: 'Display errors/warnings in colored text')
-      ..addFlag('polyfill',
-          defaultsTo: false, help: 'Generate polyfill for new CSS features')
-      ..addFlag('help',
-          abbr: 'h',
-          defaultsTo: false,
-          negatable: false,
-          help: 'Displays this help message');
-
-    try {
-      var results = parser.parse(arguments);
-      if (results['help'] || results.rest.length == 0) {
-        showUsage(parser);
-        return null;
-      }
-      return new PreprocessorOptions.fromArgs(results);
-    } on FormatException catch (e) {
-      print(e.message);
-      showUsage(parser);
-      return null;
-    }
-  }
-
-  static showUsage(parser) {
-    print('Usage: css [options...] input.css');
-    print(parser.getUsage());
-  }
-}