Generate static factories with optional arguments.

sdk/lib/html/dart2js/html_dart2js.dart

 library html;
 
 import 'dart:collection';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json';
 import 'dart:svg' as svg;
 import 'dart:web_audio' as web_audio;
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ skipping 400 matching lines @@
 /// @domName HTMLAudioElement; @docsEditable true
 class AudioElement extends MediaElement native "*HTMLAudioElement" {
 
   ///@docsEditable true
   factory AudioElement([String src]) {
     if (!?src) {
       return AudioElement._create();
     }
     return AudioElement._create(src);
   }
-  static AudioElement _create([String src = null]) {
-    if (src == null) return JS('AudioElement', 'new Audio()');
+  static AudioElement _create([String src]) {
+    if (!?src) {
+      return JS('AudioElement', 'new Audio()');
+    }
     return JS('AudioElement', 'new Audio(#)', src);
   }
 }
 // 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.
 
 
 /// @domName HTMLBRElement; @docsEditable true
 class BRElement extends Element native "*HTMLBRElement" {
@@ skipping 1154 matching lines @@
 /// @domName WebKitCSSMatrix; @docsEditable true
 class CssMatrix native "*WebKitCSSMatrix" {
 
   ///@docsEditable true
   factory CssMatrix([String cssValue]) {
     if (!?cssValue) {
       return CssMatrix._create();
     }
     return CssMatrix._create(cssValue);
   }
-  static CssMatrix _create([String cssValue = '']) =>
-      JS('CssMatrix', 'new WebKitCSSMatrix(#)', cssValue);
+  static CssMatrix _create([String cssValue]) {
+    if (!?cssValue) {
+      return JS('CssMatrix', 'new WebKitCSSMatrix()');
+    }
+    return JS('CssMatrix', 'new WebKitCSSMatrix(#)', cssValue);
+  }
 
   /// @domName WebKitCSSMatrix.a; @docsEditable true
   num a;
 
   /// @domName WebKitCSSMatrix.b; @docsEditable true
   num b;
 
   /// @domName WebKitCSSMatrix.c; @docsEditable true
   num c;
 
@@ skipping 3705 matching lines @@
   ///@docsEditable true
   factory DataView(ArrayBuffer buffer, [int byteOffset, int byteLength]) {
     if (!?byteOffset) {
       return DataView._create(buffer);
     }
     if (!?byteLength) {
       return DataView._create(buffer, byteOffset);
     }
     return DataView._create(buffer, byteOffset, byteLength);
   }
-  static DataView _create(ArrayBuffer buffer, [int byteOffset = null, int byteLength = null]) {
-    if (byteOffset == null) {
+  static DataView _create(ArrayBuffer buffer, [int byteOffset, int byteLength]) {
+    if (!?byteOffset) {
       return JS('DataView', 'new DataView(#)', buffer);
     }
-    if (byteLength == null) {
+    if (!?byteLength) {
       return JS('DataView', 'new DataView(#,#)', buffer, byteOffset);
     }
     return JS('DataView', 'new DataView(#,#,#)', buffer, byteOffset, byteLength);
   }
 
   /// @domName DataView.getFloat32; @docsEditable true
   num getFloat32(int byteOffset, {bool littleEndian}) native;
 
   /// @domName DataView.getFloat64; @docsEditable true
   num getFloat64(int byteOffset, {bool littleEndian}) native;
@@ skipping 4076 matching lines @@
 /// @domName FormData; @docsEditable true
 class FormData native "*FormData" {
 
   ///@docsEditable true
   factory FormData([FormElement form]) {
     if (!?form) {
       return FormData._create();
     }
     return FormData._create(form);
   }
-  static FormData _create([FormElement form = null]) {
-    if (form == null) return JS('FormData', 'new FormData()');
+  static FormData _create([FormElement form]) {
+    if (!?form) {
+      return JS('FormData', 'new FormData()');
+    }
     return JS('FormData', 'new FormData(#)', form);
   }
 
   /// @domName DOMFormData.append; @docsEditable true
   void append(String name, value, [String filename]) native;
 }
 // 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.
 
@@ skipping 4687 matching lines @@
 /// @domName Notification; @docsEditable true
 class Notification extends EventTarget native "*Notification" {
 
   ///@docsEditable true
   factory Notification(String title, [Map options]) {
     if (!?options) {
       return Notification._create(title);
     }
     return Notification._create(title, options);
   }
-  static Notification _create(String title, [Map options]) => JS('Notification', 'new Notification(#,#)', title, options);
+  static Notification _create(String title, [Map options]) {
+    if (!?options) {
+      return JS('Notification', 'new Notification(#)', title);
+    }
+    return JS('Notification', 'new Notification(#,#)', title, options);
+  }
 
   /// @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent; @docsEditable true
   NotificationEvents get on =>
     new NotificationEvents(this);
 
   /// @domName Notification.dir; @docsEditable true
   String dir;
 
   /// @domName Notification.permission; @docsEditable true
   final String permission;
@@ skipping 264 matching lines @@
       return OptionElement._create(data);
     }
     if (!?defaultSelected) {
       return OptionElement._create(data, value);
     }
     if (!?selected) {
       return OptionElement._create(data, value, defaultSelected);
     }
     return OptionElement._create(data, value, defaultSelected, selected);
   }
-  static OptionElement _create(
-      [String data, String value, bool defaultSelected, bool selected]) {
-    if (data == null) {
+  static OptionElement _create([String data, String value, bool defaultSelected, bool selected]) {
+    if (!?data) {
       return JS('OptionElement', 'new Option()');
     }
-    if (value == null) {
+    if (!?value) {
       return JS('OptionElement', 'new Option(#)', data);
     }
-    if (defaultSelected == null) {
+    if (!?defaultSelected) {
       return JS('OptionElement', 'new Option(#,#)', data, value);
     }
-    if (selected == null) {
-      return JS('OptionElement', 'new Option(#,#,#)',
-                data, value, defaultSelected);
+    if (!?selected) {
+      return JS('OptionElement', 'new Option(#,#,#)', data, value, defaultSelected);
     }
-    return JS('OptionElement', 'new Option(#,#,#,#)',
-              data, value, defaultSelected, selected);
+    return JS('OptionElement', 'new Option(#,#,#,#)', data, value, defaultSelected, selected);
   }
 
   /// @domName HTMLOptionElement.defaultSelected; @docsEditable true
   bool defaultSelected;
 
   /// @domName HTMLOptionElement.disabled; @docsEditable true
   bool disabled;
 
   /// @domName HTMLOptionElement.form; @docsEditable true
   final FormElement form;
@@ skipping 757 matching lines @@
 /// @domName RTCPeerConnection; @docsEditable true
 class RtcPeerConnection extends EventTarget native "*RTCPeerConnection" {
 
   ///@docsEditable true
   factory RtcPeerConnection(Map rtcIceServers, [Map mediaConstraints]) {
     if (!?mediaConstraints) {
       return RtcPeerConnection._create(rtcIceServers);
     }
     return RtcPeerConnection._create(rtcIceServers, mediaConstraints);
   }
-  static RtcPeerConnection _create(Map rtcIceServers, [Map mediaConstraints]) => JS('RtcPeerConnection', 'new RTCPeerConnection(#,#)', rtcIceServers, mediaConstraints);
+  static RtcPeerConnection _create(Map rtcIceServers, [Map mediaConstraints]) {
+    if (!?mediaConstraints) {
+      return JS('RtcPeerConnection', 'new RTCPeerConnection(#)', rtcIceServers);
+    }
+    return JS('RtcPeerConnection', 'new RTCPeerConnection(#,#)', rtcIceServers, mediaConstraints);
+  }
 
   /// @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent; @docsEditable true
   RtcPeerConnectionEvents get on =>
     new RtcPeerConnectionEvents(this);
 
   /// @domName RTCPeerConnection.iceGatheringState; @docsEditable true
   final String iceGatheringState;
 
   /// @domName RTCPeerConnection.iceState; @docsEditable true
   final String iceState;
@@ skipping 528 matching lines @@
 class SharedWorker extends AbstractWorker native "*SharedWorker" {
 
   ///@docsEditable true
   factory SharedWorker(String scriptURL, [String name]) {
     if (!?name) {
       return SharedWorker._create(scriptURL);
     }
     return SharedWorker._create(scriptURL, name);
   }
   static SharedWorker _create(String scriptURL, [String name]) {
-    if (name == null) return JS('SharedWorker', 'new SharedWorker(#)', scriptURL);
+    if (!?name) {
+      return JS('SharedWorker', 'new SharedWorker(#)', scriptURL);
+    }
     return JS('SharedWorker', 'new SharedWorker(#,#)', scriptURL, name);
   }
 
   /// @domName SharedWorker.port; @docsEditable true
   final MessagePort port;
 }
 // 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.
 
@@ skipping 1424 matching lines @@
 // 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.
 
 
 /// @domName TextTrackCue; @docsEditable true
 class TextTrackCue extends EventTarget native "*TextTrackCue" {
 
   ///@docsEditable true
   factory TextTrackCue(num startTime, num endTime, String text) => TextTrackCue._create(startTime, endTime, text);
-  static TextTrackCue _create(
-      num startTime, num endTime, String text,
-      [String settings, bool pauseOnExit]) {

[podivilov, 2012/12/29 07:42:49]

Were these optional arguments used anywhere?

[Anton Muhin, 2012/12/29 08:32:07]

I do not have a slightest idea

-        if (settings == null) {
-          return JS('TextTrackCue',
-                    'new TextTrackCue(#,#,#)',
-                    startTime, endTime, text);
-        }
-        if (pauseOnExit == null) {
-          return JS('TextTrackCue',
-                    'new TextTrackCue(#,#,#,#)',
-                    startTime, endTime, text, settings);
-        }
-        return JS('TextTrackCue',
-                  'new TextTrackCue(#,#,#,#,#)',
-                  startTime, endTime, text, settings, pauseOnExit);
-  }
+  static TextTrackCue _create(num startTime, num endTime, String text) => JS('TextTrackCue', 'new TextTrackCue(#,#,#)', startTime, endTime, text);
 
   /// @domName EventTarget.addEventListener, EventTarget.removeEventListener, EventTarget.dispatchEvent; @docsEditable true
   TextTrackCueEvents get on =>
     new TextTrackCueEvents(this);
 
   /// @domName TextTrackCue.align; @docsEditable true
   String align;
 
   /// @domName TextTrackCue.endTime; @docsEditable true
   num endTime;
@@ skipping 8025 matching lines @@
   T next() {
     if (!hasNext) {
       throw new StateError("No more elements");
     }
     return _array[_pos++];
   }
 
   final List<T> _array;
   int _pos;
 }