1 # Copyright (C) 2013 Google Inc. All rights reserved.
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4 # modification, are permitted provided that the following conditions are
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29 """Generate template values for a callback interface.
31 Extends IdlType with property |callback_cpp_type|.
33 Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
36 from idl_types import IdlType
37 from v8_globals import includes
41 CALLBACK_INTERFACE_H_INCLUDES = frozenset([
42 'bindings/v8/ActiveDOMCallback.h',
43 'bindings/v8/DOMWrapperWorld.h',
44 'bindings/v8/ScopedPersistent.h',
46 CALLBACK_INTERFACE_CPP_INCLUDES = frozenset([
47 'bindings/v8/V8Binding.h',
48 'bindings/v8/V8Callback.h',
49 'core/dom/ExecutionContext.h',
56 def cpp_type(idl_type):
57 # FIXME: remove this function by making callback types consistent
58 # (always use usual v8_types.cpp_type)
59 idl_type_name = idl_type.name
60 if idl_type_name == 'String':
61 return 'const String&'
62 if idl_type_name == 'void':
64 # Callbacks use raw pointers, so used_as_argument=True
65 usual_cpp_type = idl_type.cpp_type_args(used_as_argument=True)
66 if usual_cpp_type.startswith(('Vector', 'WillBeHeapVector')):
67 return 'const %s&' % usual_cpp_type
70 IdlType.callback_cpp_type = property(cpp_type)
73 def generate_callback_interface(callback_interface):
75 includes.update(CALLBACK_INTERFACE_CPP_INCLUDES)
77 'conditional_string': v8_utilities.conditional_string(callback_interface),
78 'cpp_class': callback_interface.name,
79 'v8_class': v8_utilities.v8_class_name(callback_interface),
80 'header_includes': set(CALLBACK_INTERFACE_H_INCLUDES),
81 'methods': [generate_method(operation)
82 for operation in callback_interface.operations],
86 def add_includes_for_operation(operation):
87 operation.idl_type.add_includes_for_type()
88 for argument in operation.arguments:
89 argument.idl_type.add_includes_for_type()
92 def generate_method(operation):
93 extended_attributes = operation.extended_attributes
94 idl_type = operation.idl_type
95 idl_type_str = str(idl_type)
96 if idl_type_str not in ['boolean', 'void']:
97 raise Exception('We only support callbacks that return boolean or void values.')
98 is_custom = 'Custom' in extended_attributes
100 add_includes_for_operation(operation)
101 call_with = extended_attributes.get('CallWith')
102 call_with_this_handle = v8_utilities.extended_attribute_value_contains(call_with, 'ThisValue')
104 'call_with_this_handle': call_with_this_handle,
105 'cpp_type': idl_type.callback_cpp_type,
107 'idl_type': idl_type_str,
108 'name': operation.name,
110 contents.update(generate_arguments_contents(operation.arguments, call_with_this_handle))
114 def generate_arguments_contents(arguments, call_with_this_handle):
115 def generate_argument(argument):
117 'handle': '%sHandle' % argument.name,
118 # FIXME: setting creation_context=v8::Handle<v8::Object>() is
119 # wrong, as toV8 then implicitly uses the current context, which
120 # causes leaks between isolated worlds if a different context is
122 'cpp_value_to_v8_value': argument.idl_type.cpp_value_to_v8_value(
123 argument.name, isolate='isolate',
124 creation_context='v8::Handle<v8::Object>()'),
127 argument_declarations = ['ScriptValue thisValue'] if call_with_this_handle else []
128 argument_declarations.extend(
129 '%s %s' % (argument.idl_type.callback_cpp_type, argument.name)
130 for argument in arguments)
132 'argument_declarations': argument_declarations,
133 'arguments': [generate_argument(argument) for argument in arguments],