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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, component):
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 string, describing where the above definitions are defined,
86 'core' or 'modules'. See KNOWN_COMPONENTS in utilities.py
89 A dictionary whose key is component and value is IdlDefinitions
90 object whose dependency is resolved.
94 A given IdlDefinitions object doesn't have any interfaces,
95 or a given IdlDefinitions object has incorrect referenced
98 # FIXME: we need to resolve dependency when we implement partial
100 if not definitions.interfaces:
101 raise Exception('No need to resolve any dependencies of '
102 'this definition: %s, because this should '
103 'have a dictionary.' % definitions.idl_name)
105 target_interface = next(definitions.interfaces.itervalues())
106 interface_name = target_interface.name
107 interface_info = self.interfaces_info[interface_name]
109 if 'inherited_extended_attributes' in interface_info:
110 target_interface.extended_attributes.update(
111 interface_info['inherited_extended_attributes'])
113 resolved_definitions = merge_interface_dependencies(
117 interface_info['dependencies_full_paths'],
120 for referenced_interface_name in interface_info['referenced_interfaces']:
121 referenced_definitions = self.reader.read_idl_definitions(
122 self.interfaces_info[referenced_interface_name]['full_path'])
124 if component not in referenced_definitions:
125 raise Exception('This definitions: %s is defined in %s '
126 'but reference interface:%s is not defined '
127 'in %s' % (definitions.idl_name,
129 referenced_interface_name,
132 resolved_definitions[component].update(referenced_definitions[component])
133 return resolved_definitions
136 def merge_interface_dependencies(definitions, component, target_interface, dependency_idl_filenames, reader):
137 """Merge dependencies ('partial interface' and 'implements') in dependency_idl_filenames into target_interface.
139 No return: modifies target_interface in place.
141 # Sort so order consistent, so can compare output from run to run.
142 for dependency_idl_filename in sorted(dependency_idl_filenames):
143 dependency_definitions = reader.read_idl_file(dependency_idl_filename)
144 # FIXME(crbug.com/358074): should not merge core definitions with
145 # modules definitions.
146 dependency_interface = next(dependency_definitions.interfaces.itervalues())
147 dependency_interface_basename, _ = os.path.splitext(os.path.basename(dependency_idl_filename))
149 transfer_extended_attributes(dependency_interface,
150 dependency_interface_basename)
151 definitions.update(dependency_definitions) # merges partial interfaces
152 if not dependency_interface.is_partial:
153 # Implemented interfaces (non-partial dependencies) are also merged
154 # into the target interface, so Code Generator can just iterate
155 # over one list (and not need to handle 'implements' itself).
156 target_interface.merge(dependency_interface)
158 # FIXME: Currently, this function just returns one IdlDefinitions
159 # instance. However, for partial interface modularization, we need to
160 # make this function return multiple definitions, i.e.
161 # { 'core': ..., 'modules': ... }.
162 return {component: definitions}
165 def transfer_extended_attributes(dependency_interface, dependency_interface_basename):
166 """Transfer extended attributes from dependency interface onto members.
168 Merging consists of storing certain interface-level data in extended
169 attributes of the *members* (because there is no separate dependency
170 interface post-merging).
172 The data storing consists of:
173 * applying certain extended attributes from the dependency interface
175 * storing the C++ class of the implementation in an internal
176 extended attribute of each member, [PartialInterfaceImplementedAs]
178 No return: modifies dependency_interface in place.
180 merged_extended_attributes = dict(
182 for key, value in dependency_interface.extended_attributes.iteritems()
183 if key in DEPENDENCY_EXTENDED_ATTRIBUTES)
185 # A partial interface's members are implemented as static member functions
186 # in a separate C++ class. This class name is stored in
187 # [PartialInterfaceImplementedAs] which defaults to the basename of
188 # dependency IDL file.
189 # This class name can be overridden by [ImplementedAs] on the partial
190 # interface definition.
192 # Note that implemented interfaces do *not* need [ImplementedAs], since
193 # they are implemented on the C++ object |impl| itself, just like members of
194 # the main interface definition, so the bindings do not need to know in
195 # which class implemented interfaces are implemented.
197 # Currently [LegacyTreatAsPartialInterface] can be used to have partial
198 # interface behavior on implemented interfaces, but this is being removed
200 # FIXME: Remove [LegacyTreatAsPartialInterface]
201 # http://crbug.com/360435
203 # Note that [ImplementedAs] is used with different meanings on interfaces
205 # for Blink class name and function name (or constant name), respectively.
206 # Thus we do not want to copy this from the interface to the member, but
207 # instead extract it and handle it separately.
208 if (dependency_interface.is_partial or
209 'LegacyTreatAsPartialInterface' in dependency_interface.extended_attributes):
210 merged_extended_attributes['PartialInterfaceImplementedAs'] = (
211 dependency_interface.extended_attributes.get(
212 'ImplementedAs', dependency_interface_basename))
214 for attribute in dependency_interface.attributes:
215 attribute.extended_attributes.update(merged_extended_attributes)
216 for constant in dependency_interface.constants:
217 constant.extended_attributes.update(merged_extended_attributes)
218 for operation in dependency_interface.operations:
219 operation.extended_attributes.update(merged_extended_attributes)