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29 """Resolve interface dependencies, producing a merged IdlDefinitions object.
31 This library computes interface dependencies (partial interfaces and
32 implements), reads the dependency files, and merges them to the IdlDefinitions
33 for the main IDL file, producing an IdlDefinitions object representing the
36 Design doc: http://www.chromium.org/developers/design-documents/idl-compiler#TOC-Dependency-resolution
41 # The following extended attributes can be applied to a dependency interface,
42 # and are then applied to the individual members when merging.
43 # Note that this moves the extended attribute from the interface to the member,
44 # which changes the semantics and yields different code than the same extended
45 # attribute on the main interface.
46 DEPENDENCY_EXTENDED_ATTRIBUTES = set([
53 class InterfaceDependencyResolver(object):
54 def __init__(self, interfaces_info, reader):
55 """Initialize dependency resolver.
59 dict of interfaces information, from compute_dependencies.py
61 IdlReader, used for reading dependency files
63 self.interfaces_info = interfaces_info
66 def resolve_dependencies(self, definitions):
67 """Resolve dependencies, merging them into IDL definitions of main file.
69 Dependencies consist of 'partial interface' for the same interface as
70 in the main file, and other interfaces that this interface 'implements'.
71 These are merged into the main IdlInterface, as the main IdlInterface
72 implements all these members.
74 Referenced interfaces are added to IdlDefinitions, but not merged into
75 the main IdlInterface, as these are only referenced (their members are
76 introspected, but not implemented in this interface).
78 Inherited extended attributes are also added to the main IdlInterface.
80 Modifies definitions in place by adding parsed dependencies.
83 definitions: IdlDefinitions object, modified in place
85 if not definitions.interfaces:
86 # This definitions should have a dictionary. Nothing to do for it.
88 target_interface = next(definitions.interfaces.itervalues())
89 interface_name = target_interface.name
90 interface_info = self.interfaces_info[interface_name]
92 if 'inherited_extended_attributes' in interface_info:
93 target_interface.extended_attributes.update(
94 interface_info['inherited_extended_attributes'])
96 merge_interface_dependencies(definitions,
98 interface_info['dependencies_full_paths'],
101 for referenced_interface_name in interface_info['referenced_interfaces']:
102 referenced_definitions = self.reader.read_idl_definitions(
103 self.interfaces_info[referenced_interface_name]['full_path'])
104 definitions.update(referenced_definitions)
107 def merge_interface_dependencies(definitions, target_interface, dependency_idl_filenames, reader):
108 """Merge dependencies ('partial interface' and 'implements') in dependency_idl_filenames into target_interface.
110 No return: modifies target_interface in place.
112 # Sort so order consistent, so can compare output from run to run.
113 for dependency_idl_filename in sorted(dependency_idl_filenames):
114 dependency_definitions = reader.read_idl_file(dependency_idl_filename)
115 dependency_interface = next(dependency_definitions.interfaces.itervalues())
116 dependency_interface_basename, _ = os.path.splitext(os.path.basename(dependency_idl_filename))
118 transfer_extended_attributes(dependency_interface,
119 dependency_interface_basename)
120 definitions.update(dependency_definitions) # merges partial interfaces
121 if not dependency_interface.is_partial:
122 # Implemented interfaces (non-partial dependencies) are also merged
123 # into the target interface, so Code Generator can just iterate
124 # over one list (and not need to handle 'implements' itself).
125 target_interface.merge(dependency_interface)
128 def transfer_extended_attributes(dependency_interface, dependency_interface_basename):
129 """Transfer extended attributes from dependency interface onto members.
131 Merging consists of storing certain interface-level data in extended
132 attributes of the *members* (because there is no separate dependency
133 interface post-merging).
135 The data storing consists of:
136 * applying certain extended attributes from the dependency interface
138 * storing the C++ class of the implementation in an internal
139 extended attribute of each member, [PartialInterfaceImplementedAs]
141 No return: modifies dependency_interface in place.
143 merged_extended_attributes = dict(
145 for key, value in dependency_interface.extended_attributes.iteritems()
146 if key in DEPENDENCY_EXTENDED_ATTRIBUTES)
148 # A partial interface's members are implemented as static member functions
149 # in a separate C++ class. This class name is stored in
150 # [PartialInterfaceImplementedAs] which defaults to the basename of
151 # dependency IDL file.
152 # This class name can be overridden by [ImplementedAs] on the partial
153 # interface definition.
155 # Note that implemented interfaces do *not* need [ImplementedAs], since
156 # they are implemented on the C++ object |impl| itself, just like members of
157 # the main interface definition, so the bindings do not need to know in
158 # which class implemented interfaces are implemented.
160 # Currently [LegacyTreatAsPartialInterface] can be used to have partial
161 # interface behavior on implemented interfaces, but this is being removed
163 # FIXME: Remove [LegacyTreatAsPartialInterface]
164 # http://crbug.com/360435
166 # Note that [ImplementedAs] is used with different meanings on interfaces
168 # for Blink class name and function name (or constant name), respectively.
169 # Thus we do not want to copy this from the interface to the member, but
170 # instead extract it and handle it separately.
171 if (dependency_interface.is_partial or
172 'LegacyTreatAsPartialInterface' in dependency_interface.extended_attributes):
173 merged_extended_attributes['PartialInterfaceImplementedAs'] = (
174 dependency_interface.extended_attributes.get(
175 'ImplementedAs', dependency_interface_basename))
177 for attribute in dependency_interface.attributes:
178 attribute.extended_attributes.update(merged_extended_attributes)
179 for constant in dependency_interface.constants:
180 constant.extended_attributes.update(merged_extended_attributes)
181 for operation in dependency_interface.operations:
182 operation.extended_attributes.update(merged_extended_attributes)