Initial cut for a development server

lib/src/options.dart

 // Copyright (c) 2014, 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.
 
 /// Set of flags and options passed to the compiler
 library ddc.src.options;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
@@ skipping 123 matching lines @@
   /// Minimum log-level reported on the command-line.
   final Level logLevel;
 
   /// File where to start compilation from.
   final String entryPointFile;
 
   /// Whether to allow casts in constant contexts.
   @override
   final bool allowConstCasts;
 
+  /// Whether to run as a development server.
+  final bool serverMode;
+
+  /// Port used for the HTTP server when [serverMode] is on.
+  final int port;
+
   /// Whether to use covariant generics
   @override
   final bool covariantGenerics;
 
   /// Whether to inject casts between Dart assignable types.
   @override
   final bool relaxedCasts;
 
   /// Whether to resolve 'package:' uris using the multi-package resolver.
   @override
@@ skipping 43 matching lines @@
       this.cheapTestFormat: false, this.ignoreTypes: false, this.outputDir,
       this.outputDart: false, this.useColors: true,
       this.covariantGenerics: true, this.relaxedCasts: true,
       this.useMultiPackage: false, this.packageRoot: 'packages/',
       this.packagePaths: const <String>[], this.inferFromOverrides: true,
       this.inferStaticsFromIdentifiers: false,
       this.inferInNonStableOrder: false,
       this.onlyInferConstsAndFinalFields: false,
       this.nonnullableTypes: TypeOptions.NONNULLABLE_TYPES, this.help: false,
       this.useMockSdk: false, this.dartSdkPath, this.logLevel: Level.SEVERE,
-      this.emitSourceMaps: true, this.entryPointFile: null});
+      this.emitSourceMaps: true, this.entryPointFile: null,
+      this.serverMode: false, this.port: 8080});
 }
 
 /// Parses options from the command-line
 CompilerOptions parseOptions(List<String> argv) {
   ArgResults args = argParser.parse(argv);
   var levelName = args['log'].toUpperCase();
   var useColors = stdioType(stdout) == StdioType.TERMINAL;
   var sdkPath = args['dart-sdk'];
   if (sdkPath == null && !args['mock-sdk']) {
     sdkPath = getSdkDir(argv).path;
@@ skipping 20 matching lines @@
       inferInNonStableOrder: args['infer-eagerly'],
       onlyInferConstsAndFinalFields: args['infer-only-finals'],
       nonnullableTypes: optionsToList(args['nonnullable'],
           defaultValue: TypeOptions.NONNULLABLE_TYPES),
       help: args['help'],
       useMockSdk: args['mock-sdk'],
       dartSdkPath: sdkPath,
       logLevel: Level.LEVELS.firstWhere((Level l) => l.name == levelName,
           orElse: () => Level.SEVERE),
       emitSourceMaps: args['source-maps'],
-      entryPointFile: args.rest.length == 0 ? null : args.rest.first);
+      entryPointFile: args.rest.length == 0 ? null : args.rest.first,
+      serverMode: args['server'],
+      port: int.parse(args['port']));
 }
 
 final ArgParser argParser = new ArgParser()
   // resolver/checker options
   ..addFlag('allow-const-casts',
       help: 'Allow casts in const contexts', defaultsTo: true)
   ..addFlag('sdk-check',
       abbr: 's', help: 'Typecheck sdk libs', defaultsTo: false)
   ..addFlag('mock-sdk',
       abbr: 'm', help: 'Use a mock Dart SDK', defaultsTo: false)
@@ skipping 35 matching lines @@
   ..addFlag('use-multi-package',
       help: 'Whether to use the multi-package resolver for "package:" imports',
       defaultsTo: false)
   ..addOption('package-paths', help: 'if using the multi-package resolver, '
       'the list of directories where to look for packages.', defaultsTo: '')
   ..addFlag('source-maps',
       help: 'Whether to emit source map files', defaultsTo: true)
 
   // general options
   ..addFlag('help', abbr: 'h', help: 'Display this message')
+  ..addFlag('server', help: 'Run as a development server.', defaultsTo: false)
+  ..addOption('port',
+      help: 'Port where to serve files from (used only when --serve is on)',
+      defaultsTo: '8080')
   ..addFlag('force-compile',
       help: 'Compile code with static errors', defaultsTo: false)
   ..addOption('log', abbr: 'l', help: 'Logging level', defaultsTo: 'severe')
   ..addFlag('dump-info',
       abbr: 'i', help: 'Dump summary information', defaultsTo: false)
   ..addOption('dump-info-file',
       abbr: 'f',
       help: 'Dump info json file (requires dump-info)',
       defaultsTo: null);