IDL: reuse more code between CG for methods and constructors

Source/bindings/scripts/idl_definitions.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 437 matching lines @@
 
 ################################################################################
 # Operations
 ################################################################################
 
 class IdlOperation(TypedObject):
     def __init__(self, node=None):
         self.arguments = []
         self.extended_attributes = {}
         self.specials = []
+        self.is_constructor = False
 
         if not node:
             self.is_static = False
             return
         self.name = node.GetName()  # FIXME: should just be: or ''
         # FIXME: AST should use None internally
         if self.name == '_unnamed_':
             self.name = ''
 
         self.is_static = node.GetProperty('STATIC') or False
@@ skipping 34 matching lines @@
             ext_attributes_node = children[1]
             operation.extended_attributes = ext_attributes_node_to_extended_attributes(ext_attributes_node)
 
         return operation
 
     @classmethod
     def constructor_from_arguments_node(cls, name, arguments_node):
         constructor = cls()
         constructor.name = name
         constructor.arguments = arguments_node_to_arguments(arguments_node)
+        constructor.is_constructor = True
         return constructor
 
     def resolve_typedefs(self, typedefs):
         TypedObject.resolve_typedefs(self, typedefs)
         for argument in self.arguments:
             argument.resolve_typedefs(typedefs)
 
 
 ################################################################################
 # Arguments
@@ skipping 223 matching lines @@
     child_class = child.GetClass()
     if child_class != 'Type':
         raise ValueError('Unrecognized node class: %s' % child_class)
     return type_node_to_type(child)
 
 
 def union_type_node_to_idl_union_type(node, is_nullable=False):
     member_types = [type_node_to_type(member_type_node)
                     for member_type_node in node.GetChildren()]
     return IdlUnionType(member_types, is_nullable=is_nullable)