Implement modular compilation

lib/src/runner/runtime_utils.dart

-// Copyright (c) 2015, 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.
-
-/// JS runtime files utilities used by dartdevrun.
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:path/path.dart';
-
-import '../compiler.dart' show defaultRuntimeFiles;
-import '../options.dart';
-import 'file_utils.dart';
-
-/// In node.js / io.js, these modules need to be aliased globally
-/// (e.g. `var foo = require('./path/to/foo.js')`).
-/// TODO(ochafik): Investigate alternative module / alias patterns.
-const _ALIASED_RUNTIME_FILES = const {'dart_library.js': 'dart_library',};
-
-/// If [path] is a runtime file with an alias, returns that alias, otherwise
-/// returns null.
-String getRuntimeFileAlias(CompilerOptions options, File file) =>
-    file.absolute.path.startsWith(_getRuntimeDir(options).absolute.path)
-        ? _ALIASED_RUNTIME_FILES[basename(file.path)]
-        : null;
-
-Directory _getRuntimeDir(CompilerOptions options) => new Directory(
-    join(options.codegenOptions.outputDir, 'dev_compiler', 'runtime'));
-
-Future<List<File>> listOutputFiles(CompilerOptions options) async {
-  List<File> files =
-      await listJsFiles(new Directory(options.codegenOptions.outputDir));
-
-  var runtimePath = _getRuntimeDir(options).absolute.path;
-  isRuntimeFile(File file) => file.path.startsWith(runtimePath);
-
-  final maxIndex = defaultRuntimeFiles.length;
-  getPriorityIndex(File file) {
-    if (!isRuntimeFile(file)) return maxIndex;
-    int i = defaultRuntimeFiles.indexOf(basename(file.path));
-    return i < 0 ? maxIndex : i;
-  }
-  return files
-    ..sort((File a, File b) {
-      int pa = getPriorityIndex(a), pb = getPriorityIndex(b);
-      return pa != pb ? (pa - pb) : a.path.compareTo(b.path);
-    });
-}
-
-/// TODO(ochafik): Split / reuse [AbstractCompiler.getModuleName].
-String getMainModuleName(CompilerOptions options) =>
-    basename(withoutExtension(options.inputs.single));