Support overloaded constructors.

tools/dom/scripts/systemhtml.py

 #!/usr/bin/python
 # 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.
 
 """This module provides shared functionality for the system to generate
 Dart:html APIs from the IDL database."""
 
 import emitter
 import os
@@ skipping 504 matching lines @@
 
   def FinishInterface(self):
     pass
 
   def HasSupportCheck(self):
     return self._interface.doc_js_name in js_support_checks
 
   def GetSupportCheck(self):
     return js_support_checks.get(self._interface.doc_js_name)
 
-  def EmitStaticFactory(self, constructor_info):
-    WITH_CUSTOM_STATIC_FACTORY = [
+  def GenerateCustomFactory(self, constructor_info):
+    # Custom factory will be taken from the template.
+    return self._interface.doc_js_name in [
         'AudioContext',
         'Blob',
         'MutationObserver',
         'SpeechRecognition',
     ]
 
-    if self._interface.doc_js_name in WITH_CUSTOM_STATIC_FACTORY:
-      return
+  def IsConstructorArgumentOptional(self, argument):
+    return 'Optional' in argument.ext_attrs
 
-    has_optional = any(param_info.is_optional
-        for param_info in constructor_info.param_infos)
-
-    def FormatJS(index):
-      arguments = constructor_info.ParametersAsArgumentList(index)
-      if arguments:
-        arguments = ', ' + arguments
-      return "JS('%s', 'new %s(%s)'%s)" % (
-          self._interface_type_info.interface_name(),
-          constructor_info.name or self._interface.doc_js_name,
-          ','.join(['#'] * index),
-          arguments)
-
-    if not has_optional:
-      self._members_emitter.Emit(
-          "  static $INTERFACE_NAME _create($PARAMETERS_DECLARATION) => $JS;\n",
-          INTERFACE_NAME=self._interface_type_info.interface_name(),
-          PARAMETERS_DECLARATION=constructor_info.ParametersDeclaration(
-              self._DartType),
-          JS=FormatJS(len(constructor_info.param_infos)))
-    else:
-      dispatcher_emitter = self._members_emitter.Emit(
-          "  static $INTERFACE_NAME _create($PARAMETERS_DECLARATION) {\n"
-          "$!DISPATCHER"
-          "    return $JS;\n"
-          "  }\n",
-          INTERFACE_NAME=self._interface_type_info.interface_name(),
-          PARAMETERS_DECLARATION=constructor_info.ParametersDeclaration(
-              self._DartType),
-          JS=FormatJS(len(constructor_info.param_infos)))
-
-      for index, param_info in enumerate(constructor_info.param_infos):
-        if param_info.is_optional:
-          dispatcher_emitter.Emit(
-            "    if (!?$OPT_PARAM_NAME) {\n"
-            "      return $JS;\n"
-            "    }\n",
-            OPT_PARAM_NAME=constructor_info.param_infos[index].name,
-            JS=FormatJS(index))
+  def EmitStaticFactoryOverload(self, constructor_info, name, arguments):
+    index = len(arguments)
+    arguments = constructor_info.ParametersAsArgumentList(index)
+    if arguments:
+      arguments = ', ' + arguments
+    self._members_emitter.Emit(
+        "  static $INTERFACE_NAME $NAME($PARAMETERS) => "
+          "JS('$INTERFACE_NAME', 'new $CTOR_NAME($PLACEHOLDERS)'$ARGUMENTS);\n",
+        INTERFACE_NAME=self._interface_type_info.interface_name(),
+        NAME=name,
+        # TODO(antonm): add types to parameters.
+        PARAMETERS=constructor_info.ParametersAsArgumentList(index),
+        CTOR_NAME=constructor_info.name or self._interface.doc_js_name,
+        PLACEHOLDERS=','.join(['#'] * index),
+        ARGUMENTS=arguments)
 
   def SecondaryContext(self, interface):
     if interface is not self._current_secondary_parent:
       self._current_secondary_parent = interface
       self._members_emitter.Emit('\n  // From $WHERE\n', WHERE=interface.id)
 
   def AddIndexer(self, element_type):
     """Adds all the methods required to complete implementation of List."""
     # We would like to simply inherit the implementation of everything except
     # length, [], and maybe []=.  It is possible to extend from a base
@@ skipping 457 matching lines @@
     for library_name in libraries:
       self._libraries[library_name] = DartLibrary(
           library_name, template_loader, library_type, output_dir)
 
   def AddFile(self, basename, library_name, path):
     self._libraries[library_name].AddFile(path)
 
   def Emit(self, emitter, auxiliary_dir):
     for lib in self._libraries.values():
       lib.Emit(emitter, auxiliary_dir)