fix #626, add AMD module format and make it default

lib/runtime/dart_library.js

-// 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.
-
-/* This file defines the module loader for the dart runtime.
-*/
-
-var dart_library =
-  typeof module != "undefined" && module.exports || {};
-
-(function (dart_library) {
-  'use strict';
-
-  /** Note that we cannot use dart_utils.throwInternalError from here. */
-  function throwLibraryError(message) {
-    throw Error(message);
-  }
-
-  const dartLibraryName = Symbol('dartLibraryName');
-  dart_library.dartLibraryName = dartLibraryName;
-
-  const libraryImports = Symbol('libraryImports');
-  dart_library.libraryImports = libraryImports;
-
-  // Module support.  This is a simplified module system for Dart.
-  // Longer term, we can easily migrate to an existing JS module system:
-  // ES6, AMD, RequireJS, ....
-
-  class LibraryLoader {
-
-    constructor(name, defaultValue, imports, loader) {
-      this._name = name;
-      this._library = defaultValue ? defaultValue : {};
-      this._imports = imports;
-      this._loader = loader;
-
-      // Cyclic import detection
-      this._state = LibraryLoader.NOT_LOADED;
-    }
-
-    loadImports() {
-      let results = [];
-      for (let name of this._imports) {
-        let lib = libraries.get(name);
-        if (!lib) {
-          throwLibraryError('Library not available: ' + name);
-        }
-        results.push(lib.load());
-      }
-      return results;
-    }
-
-    load() {
-      // Check for cycles
-      if (this._state == LibraryLoader.LOADING) {
-        throwLibraryError('Circular dependence on library: '
-                              + this._name);
-      } else if (this._state >= LibraryLoader.READY) {
-        return this._library;
-      }
-      this._state = LibraryLoader.LOADING;
-
-      // Handle imports
-      let args = this.loadImports();
-
-      // Load the library
-      args.unshift(this._library);
-      this._loader.apply(null, args);
-      this._state = LibraryLoader.READY;
-      this._library[dartLibraryName] = this._name;
-      this._library[libraryImports] = this._imports;
-      return this._library;
-    }
-
-    stub() {
-      return this._library;
-    }
-  }
-  LibraryLoader.NOT_LOADED = 0;
-  LibraryLoader.LOADING = 1;
-  LibraryLoader.READY = 2;
-
-  // Map from name to LibraryLoader
-  let libraries = new Map();
-  dart_library.libraries = function() { return libraries.keys(); };
-  dart_library.debuggerLibraries = function() {
-    var debuggerLibraries = [];
-    libraries.forEach(function (value, key, map) {
-      debuggerLibraries.push(value.load());
-    });
-    debuggerLibraries.__proto__ = null;
-    return debuggerLibraries;
-  };
-
-  function library(name, defaultValue, imports, loader) {
-    let result = new LibraryLoader(name, defaultValue, imports, loader);
-    libraries.set(name, result);
-    return result;
-  }
-  dart_library.library = library;
-
-  function import_(libraryName) {
-    bootstrap();
-    let loader = libraries.get(libraryName);
-    // TODO(vsm): A user might call this directly from JS (as we do in tests).
-    // We may want a different error type.
-    if (!loader) throwLibraryError('Library not found: ' + libraryName);
-    return loader.load();
-  }
-  dart_library.import = import_;
-
-  function start(moduleName, libraryName) {
-    if (libraryName == null) libraryName = moduleName;
-    let library = import_(moduleName)[libraryName];
-    let dart_sdk = import_('dart_sdk');
-    dart_sdk._isolate_helper.startRootIsolate(library.main, []);
-  }
-  dart_library.start = start;
-
-  let _bootstrapped = false;
-  function bootstrap() {
-    if (_bootstrapped) return;
-    _bootstrapped = true;
-
-    // Force import of core.
-    var dart_sdk = import_('dart_sdk');
-
-    // TODO(vsm): DOM facades?
-    // See: https://github.com/dart-lang/dev_compiler/issues/173
-    if (typeof NodeList !== "undefined") {
-      NodeList.prototype.get = function(i) { return this[i]; };
-      NamedNodeMap.prototype.get = function(i) { return this[i]; };
-      DOMTokenList.prototype.get = function(i) { return this[i]; };
-      HTMLCollection.prototype.get = function(i) { return this[i]; };
-      // Expose constructors for DOM types dart:html needs to assume are
-      // available on window.
-      if (typeof PannerNode == "undefined") {
-        let audioContext = new AudioContext();
-        window.PannerNode = audioContext.createPanner().constructor;
-        window.StereoPannerNode = audioContext.createStereoPanner().constructor;
-      }
-      if (typeof AudioSourceNode == "undefined") {
-        window.AudioSourceNode = MediaElementAudioSourceNode.constructor;
-      }
-      if (typeof FontFaceSet == "undefined") {
-        window.FontFaceSet = document.fonts.__proto__.constructor;
-      }
-      if (typeof MemoryInfo == "undefined") {
-        window.MemoryInfo = window.performance.memory.constructor;
-      }
-      if (typeof Geolocation == "undefined") {
-        navigator.geolocation.constructor;
-      }
-      if (typeof Animation == "undefined") {
-        let d = document.createElement('div');
-        window.Animation = d.animate(d).constructor;
-      }
-      if (typeof SourceBufferList == "undefined") {
-        window.SourceBufferList = new MediaSource().sourceBuffers.constructor;
-      }
-    }
-
-    // This import is only needed for chrome debugging. We should provide an
-    // option to compile without it.
-    dart_sdk._debugger.registerDevtoolsFormatter();
-  }
-
-})(dart_library);