IDL: Support 'stringifier' keyword

Source/bindings/scripts/v8_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 # coding=utf-8
 #
 # 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
@@ skipping 18 matching lines @@
 
 """Generate template values for an interface.
 
 Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
 """
 
 from collections import defaultdict
 import itertools
 from operator import itemgetter
 
+import idl_definitions
+from idl_definitions import IdlOperation
 import idl_types
 from idl_types import IdlType, inherits_interface
 import v8_attributes
 from v8_globals import includes
 import v8_methods
 import v8_types
 from v8_types import cpp_ptr_type, cpp_template_type
 import v8_utilities
 from v8_utilities import capitalize, conditional_string, cpp_name, gc_type, has_extended_attribute_value, runtime_enabled_function_name
 
@@ skipping 196 matching lines @@
         'has_per_context_enabled_attributes': any(attribute['per_context_enabled_function'] for attribute in attributes),
         'has_replaceable_attributes': any(attribute['is_replaceable'] for attribute in attributes),
     })
 
     # Methods
     methods = [v8_methods.method_context(interface, method)
                for method in interface.operations
                if method.name]  # Skip anonymous special operations (methods)
     compute_method_overloads_context(methods)
 
+    # Stringifier
+    if interface.stringifier:
+        stringifier = interface.stringifier
+        method = IdlOperation()
+        method.name = 'toString'
+        method.idl_type = IdlType('DOMString')
+        method.extended_attributes.update(stringifier.extended_attributes)
+        if stringifier.attribute:
+            method.extended_attributes['ImplementedAs'] = stringifier.attribute.name
+        elif stringifier.operation:
+            method.extended_attributes['ImplementedAs'] = stringifier.operation.name
+        methods.append(v8_methods.method_context(interface, method))
+
     per_context_enabled_methods = []
     custom_registration_methods = []
     method_configuration_methods = []
 
     for method in methods:
         # Skip all but one method in each set of overloaded methods.
         if 'overload_index' in method and 'overloads' not in method:
             continue
 
         if 'overloads' in method:
@@ skipping 811 matching lines @@
         deleter = next(
             method
             for method in interface.operations
             if ('deleter' in method.specials and
                 len(method.arguments) == 1 and
                 str(method.arguments[0].idl_type) == 'DOMString'))
     except StopIteration:
         return None
 
     return property_deleter(deleter)