move polymer.dart into dart svn

pkg/polymer/lib/src/compiler_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 polymer.src.compiler_options;
+
+import 'package:args/args.dart';
+
+class CompilerOptions {
+  /** Report warnings as errors. */
+  final bool warningsAsErrors;
+
+  /** True to show informational messages. The `--verbose` flag. */
+  final bool verbose;
+
+  /** Remove any generated files. */
+  final bool clean;
+
+  /** Whether to use colors to print messages on the terminal. */
+  final bool useColors;
+
+  /** Force mangling any generated name (even when --out is provided). */
+  final bool forceMangle;
+
+  /** Generate component's dart code, but not the main entry point file. */
+  final bool componentsOnly;
+
+  /** File to process by the compiler. */
+  String inputFile;
+
+  /** Directory where all sources are found. */
+  final String baseDir;
+
+  /** Directory where all output will be generated. */
+  final String outputDir;
+
+  /** Directory where to look for 'package:' imports. */
+  final String packageRoot;
+
+  /**
+   * Adjust resource URLs in the output HTML to point back to the original
+   * location in the file system. Commonly this is enabled during development,
+   * but disabled for deployment.
+   */
+  final bool rewriteUrls;
+
+  /**
+   * Whether to print error messages using the json format understood by the
+   * Dart editor.
+   */
+  final bool jsonFormat;
+
+  /** Emulate scoped styles using a CSS polyfill. */
+  final bool emulateScopedCss;
+
+  /** Use CSS file for CSS Reset. */
+  final String resetCssFile;
+
+  /** Whether to analyze the input for warnings without generating any code. */
+  final bool analysisOnly;
+
+  // We could make this faster, if it ever matters.
+  factory CompilerOptions() => parse(['']);
+
+  CompilerOptions.fromArgs(ArgResults args)
+    : warningsAsErrors = args['warnings_as_errors'],
+      verbose = args['verbose'],
+      clean = args['clean'],
+      useColors = args['colors'],
+      baseDir = args['basedir'],
+      outputDir = args['out'],
+      packageRoot = args['package-root'],
+      rewriteUrls = args['rewrite-urls'],
+      forceMangle = args['unique_output_filenames'],
+      jsonFormat = args['json_format'],
+      componentsOnly = args['components_only'],
+      emulateScopedCss = args['scoped-css'],
+      resetCssFile = args['css-reset'],
+      analysisOnly = !args['deploy'],
+      inputFile = args.rest.length > 0 ? args.rest[0] : null;
+
+  /**
+   * Returns the compiler options parsed from [arguments]. Set [checkUsage] to
+   * false to suppress checking of correct usage or printing help messages.
+   */
+  // TODO(sigmund): convert all flags to use dashes instead of underscores
+  static CompilerOptions parse(List<String> arguments,
+      {bool checkUsage: true}) {
+    var parser = new ArgParser()
+      ..addFlag('verbose', abbr: 'v')
+      ..addFlag('clean', help: 'Remove all generated files',
+          defaultsTo: false, negatable: false)
+      ..addFlag('warnings_as_errors', abbr: 'e',
+          help: 'Warnings handled as errors',
+          defaultsTo: false, negatable: false)
+      ..addFlag('colors', help: 'Display errors/warnings in colored text',
+          defaultsTo: true)
+      ..addFlag('rewrite-urls',
+          help: 'Adjust every resource url to point to the original location in'
+          ' the filesystem.\nThis on by default during development and can be'
+          ' disabled to make the generated code easier to deploy.',
+          defaultsTo: true)
+      ..addFlag('unique_output_filenames', abbr: 'u',
+          help: 'Use unique names for all generated files, so they will not '
+                'have the\nsame name as your input files, even if they are in a'
+                ' different directory',
+          defaultsTo: false, negatable: false)
+      ..addFlag('json_format',
+          help: 'Print error messsages in a json format easy to parse by tools,'
+                ' such as the Dart editor',
+          defaultsTo: false, negatable: false)
+      ..addFlag('components_only',
+          help: 'Generate only the code for component classes, do not generate '
+                'HTML files or the main bootstrap code.',
+          defaultsTo: false, negatable: false)
+      ..addFlag('scoped-css', help: 'Emulate scoped styles with CSS polyfill',
+          defaultsTo: false)
+      ..addOption('css-reset', abbr: 'r', help: 'CSS file used to reset CSS')
+      ..addFlag('deploy', help: 'Emit code used for deploying a polymer app,'
+          ' if false just show warnings and errors (default)',
+          defaultsTo: false, negatable: false)
+      ..addOption('out', abbr: 'o', help: 'Directory where to generate files'
+          ' (defaults to the same directory as the source file)')
+      ..addOption('basedir', help: 'Base directory where to find all source '
+          'files (defaults to the source file\'s directory)')
+      ..addOption('package-root', help: 'Where to find "package:" imports'
+          '(defaults to the "packages/" subdirectory next to the source file)')
+      ..addFlag('help', abbr: 'h', help: 'Displays this help message',
+          defaultsTo: false, negatable: false);
+    try {
+      var results = parser.parse(arguments);
+      if (checkUsage && (results['help'] || results.rest.length == 0)) {
+        showUsage(parser);
+        return null;
+      }
+      return new CompilerOptions.fromArgs(results);
+    } on FormatException catch (e) {
+      print(e.message);
+      showUsage(parser);
+      return null;
+    }
+  }
+
+  static showUsage(parser) {
+    print('Usage: dwc [options...] input.html');
+    print(parser.getUsage());
+  }
+}