diff options
Diffstat (limited to 'generator/google/protobuf/descriptor_pool.py')
| -rw-r--r-- | generator/google/protobuf/descriptor_pool.py | 579 |
1 files changed, 433 insertions, 146 deletions
diff --git a/generator/google/protobuf/descriptor_pool.py b/generator/google/protobuf/descriptor_pool.py index 8f1f445..5c055ab 100644 --- a/generator/google/protobuf/descriptor_pool.py +++ b/generator/google/protobuf/descriptor_pool.py @@ -1,6 +1,6 @@ # Protocol Buffers - Google's data interchange format # Copyright 2008 Google Inc. All rights reserved. -# http://code.google.com/p/protobuf/ +# https://developers.google.com/protocol-buffers/ # # Redistribution and use in source and binary forms, with or without # modification, are permitted provided that the following conditions are @@ -49,18 +49,46 @@ Below is a straightforward example on how to use this class: The message descriptor can be used in conjunction with the message_factory module in order to create a protocol buffer class that can be encoded and decoded. + +If you want to get a Python class for the specified proto, use the +helper functions inside google.protobuf.message_factory +directly instead of this class. """ __author__ = 'matthewtoia@google.com (Matt Toia)' -from google.protobuf import descriptor_pb2 from google.protobuf import descriptor from google.protobuf import descriptor_database +from google.protobuf import text_encoding + + +_USE_C_DESCRIPTORS = descriptor._USE_C_DESCRIPTORS + + +def _NormalizeFullyQualifiedName(name): + """Remove leading period from fully-qualified type name. + + Due to b/13860351 in descriptor_database.py, types in the root namespace are + generated with a leading period. This function removes that prefix. + + Args: + name: A str, the fully-qualified symbol name. + + Returns: + A str, the normalized fully-qualified symbol name. + """ + return name.lstrip('.') class DescriptorPool(object): """A collection of protobufs dynamically constructed by descriptor protos.""" + if _USE_C_DESCRIPTORS: + + def __new__(cls, descriptor_db=None): + # pylint: disable=protected-access + return descriptor._message.DescriptorPool(descriptor_db) + def __init__(self, descriptor_db=None): """Initializes a Pool of proto buffs. @@ -89,6 +117,65 @@ class DescriptorPool(object): self._internal_db.Add(file_desc_proto) + def AddSerializedFile(self, serialized_file_desc_proto): + """Adds the FileDescriptorProto and its types to this pool. + + Args: + serialized_file_desc_proto: A bytes string, serialization of the + FileDescriptorProto to add. + """ + + # pylint: disable=g-import-not-at-top + from google.protobuf import descriptor_pb2 + file_desc_proto = descriptor_pb2.FileDescriptorProto.FromString( + serialized_file_desc_proto) + self.Add(file_desc_proto) + + def AddDescriptor(self, desc): + """Adds a Descriptor to the pool, non-recursively. + + If the Descriptor contains nested messages or enums, the caller must + explicitly register them. This method also registers the FileDescriptor + associated with the message. + + Args: + desc: A Descriptor. + """ + if not isinstance(desc, descriptor.Descriptor): + raise TypeError('Expected instance of descriptor.Descriptor.') + + self._descriptors[desc.full_name] = desc + self.AddFileDescriptor(desc.file) + + def AddEnumDescriptor(self, enum_desc): + """Adds an EnumDescriptor to the pool. + + This method also registers the FileDescriptor associated with the message. + + Args: + enum_desc: An EnumDescriptor. + """ + + if not isinstance(enum_desc, descriptor.EnumDescriptor): + raise TypeError('Expected instance of descriptor.EnumDescriptor.') + + self._enum_descriptors[enum_desc.full_name] = enum_desc + self.AddFileDescriptor(enum_desc.file) + + def AddFileDescriptor(self, file_desc): + """Adds a FileDescriptor to the pool, non-recursively. + + If the FileDescriptor contains messages or enums, the caller must explicitly + register them. + + Args: + file_desc: A FileDescriptor. + """ + + if not isinstance(file_desc, descriptor.FileDescriptor): + raise TypeError('Expected instance of descriptor.FileDescriptor.') + self._file_descriptors[file_desc.name] = file_desc + def FindFileByName(self, file_name): """Gets a FileDescriptor by file name. @@ -103,6 +190,11 @@ class DescriptorPool(object): """ try: + return self._file_descriptors[file_name] + except KeyError: + pass + + try: file_proto = self._internal_db.FindFileByName(file_name) except KeyError as error: if self._descriptor_db: @@ -126,6 +218,17 @@ class DescriptorPool(object): KeyError: if the file can not be found in the pool. """ + symbol = _NormalizeFullyQualifiedName(symbol) + try: + return self._descriptors[symbol].file + except KeyError: + pass + + try: + return self._enum_descriptors[symbol].file + except KeyError: + pass + try: file_proto = self._internal_db.FindFileContainingSymbol(symbol) except KeyError as error: @@ -147,7 +250,7 @@ class DescriptorPool(object): The descriptor for the named type. """ - full_name = full_name.lstrip('.') # fix inconsistent qualified name formats + full_name = _NormalizeFullyQualifiedName(full_name) if full_name not in self._descriptors: self.FindFileContainingSymbol(full_name) return self._descriptors[full_name] @@ -162,11 +265,44 @@ class DescriptorPool(object): The enum descriptor for the named type. """ - full_name = full_name.lstrip('.') # fix inconsistent qualified name formats + full_name = _NormalizeFullyQualifiedName(full_name) if full_name not in self._enum_descriptors: self.FindFileContainingSymbol(full_name) return self._enum_descriptors[full_name] + def FindFieldByName(self, full_name): + """Loads the named field descriptor from the pool. + + Args: + full_name: The full name of the field descriptor to load. + + Returns: + The field descriptor for the named field. + """ + full_name = _NormalizeFullyQualifiedName(full_name) + message_name, _, field_name = full_name.rpartition('.') + message_descriptor = self.FindMessageTypeByName(message_name) + return message_descriptor.fields_by_name[field_name] + + def FindExtensionByName(self, full_name): + """Loads the named extension descriptor from the pool. + + Args: + full_name: The full name of the extension descriptor to load. + + Returns: + A FieldDescriptor, describing the named extension. + """ + full_name = _NormalizeFullyQualifiedName(full_name) + message_name, _, extension_name = full_name.rpartition('.') + try: + # Most extensions are nested inside a message. + scope = self.FindMessageTypeByName(message_name) + except KeyError: + # Some extensions are defined at file scope. + scope = self.FindFileContainingSymbol(full_name) + return scope.extensions_by_name[extension_name] + def _ConvertFileProtoToFileDescriptor(self, file_proto): """Creates a FileDescriptor from a proto or returns a cached copy. @@ -181,54 +317,95 @@ class DescriptorPool(object): """ if file_proto.name not in self._file_descriptors: + built_deps = list(self._GetDeps(file_proto.dependency)) + direct_deps = [self.FindFileByName(n) for n in file_proto.dependency] + public_deps = [direct_deps[i] for i in file_proto.public_dependency] + file_descriptor = descriptor.FileDescriptor( + pool=self, name=file_proto.name, package=file_proto.package, + syntax=file_proto.syntax, options=file_proto.options, - serialized_pb=file_proto.SerializeToString()) - scope = {} - dependencies = list(self._GetDeps(file_proto)) - - for dependency in dependencies: - dep_desc = self.FindFileByName(dependency.name) - dep_proto = descriptor_pb2.FileDescriptorProto.FromString( - dep_desc.serialized_pb) - package = '.' + dep_proto.package - package_prefix = package + '.' - - def _strip_package(symbol): - if symbol.startswith(package_prefix): - return symbol[len(package_prefix):] - return symbol - - symbols = list(self._ExtractSymbols(dep_proto.message_type, package)) - scope.update(symbols) - scope.update((_strip_package(k), v) for k, v in symbols) - - symbols = list(self._ExtractEnums(dep_proto.enum_type, package)) - scope.update(symbols) - scope.update((_strip_package(k), v) for k, v in symbols) - - for message_type in file_proto.message_type: - message_desc = self._ConvertMessageDescriptor( - message_type, file_proto.package, file_descriptor, scope) - file_descriptor.message_types_by_name[message_desc.name] = message_desc - for enum_type in file_proto.enum_type: - self._ConvertEnumDescriptor(enum_type, file_proto.package, - file_descriptor, None, scope) - for desc_proto in self._ExtractMessages(file_proto.message_type): - self._SetFieldTypes(desc_proto, scope) - - for desc_proto in file_proto.message_type: - desc = scope[desc_proto.name] - file_descriptor.message_types_by_name[desc_proto.name] = desc + serialized_pb=file_proto.SerializeToString(), + dependencies=direct_deps, + public_dependencies=public_deps) + if _USE_C_DESCRIPTORS: + # When using C++ descriptors, all objects defined in the file were added + # to the C++ database when the FileDescriptor was built above. + # Just add them to this descriptor pool. + def _AddMessageDescriptor(message_desc): + self._descriptors[message_desc.full_name] = message_desc + for nested in message_desc.nested_types: + _AddMessageDescriptor(nested) + for enum_type in message_desc.enum_types: + _AddEnumDescriptor(enum_type) + def _AddEnumDescriptor(enum_desc): + self._enum_descriptors[enum_desc.full_name] = enum_desc + for message_type in file_descriptor.message_types_by_name.values(): + _AddMessageDescriptor(message_type) + for enum_type in file_descriptor.enum_types_by_name.values(): + _AddEnumDescriptor(enum_type) + else: + scope = {} + + # This loop extracts all the message and enum types from all the + # dependencies of the file_proto. This is necessary to create the + # scope of available message types when defining the passed in + # file proto. + for dependency in built_deps: + scope.update(self._ExtractSymbols( + dependency.message_types_by_name.values())) + scope.update((_PrefixWithDot(enum.full_name), enum) + for enum in dependency.enum_types_by_name.values()) + + for message_type in file_proto.message_type: + message_desc = self._ConvertMessageDescriptor( + message_type, file_proto.package, file_descriptor, scope, + file_proto.syntax) + file_descriptor.message_types_by_name[message_desc.name] = ( + message_desc) + + for enum_type in file_proto.enum_type: + file_descriptor.enum_types_by_name[enum_type.name] = ( + self._ConvertEnumDescriptor(enum_type, file_proto.package, + file_descriptor, None, scope)) + + for index, extension_proto in enumerate(file_proto.extension): + extension_desc = self._MakeFieldDescriptor( + extension_proto, file_proto.package, index, is_extension=True) + extension_desc.containing_type = self._GetTypeFromScope( + file_descriptor.package, extension_proto.extendee, scope) + self._SetFieldType(extension_proto, extension_desc, + file_descriptor.package, scope) + file_descriptor.extensions_by_name[extension_desc.name] = ( + extension_desc) + + for desc_proto in file_proto.message_type: + self._SetAllFieldTypes(file_proto.package, desc_proto, scope) + + if file_proto.package: + desc_proto_prefix = _PrefixWithDot(file_proto.package) + else: + desc_proto_prefix = '' + + for desc_proto in file_proto.message_type: + desc = self._GetTypeFromScope( + desc_proto_prefix, desc_proto.name, scope) + file_descriptor.message_types_by_name[desc_proto.name] = desc + + for index, service_proto in enumerate(file_proto.service): + file_descriptor.services_by_name[service_proto.name] = ( + self._MakeServiceDescriptor(service_proto, index, scope, + file_proto.package, file_descriptor)) + self.Add(file_proto) self._file_descriptors[file_proto.name] = file_descriptor return self._file_descriptors[file_proto.name] def _ConvertMessageDescriptor(self, desc_proto, package=None, file_desc=None, - scope=None): + scope=None, syntax=None): """Adds the proto to the pool in the specified package. Args: @@ -255,15 +432,22 @@ class DescriptorPool(object): scope = {} nested = [ - self._ConvertMessageDescriptor(nested, desc_name, file_desc, scope) + self._ConvertMessageDescriptor( + nested, desc_name, file_desc, scope, syntax) for nested in desc_proto.nested_type] enums = [ self._ConvertEnumDescriptor(enum, desc_name, file_desc, None, scope) for enum in desc_proto.enum_type] fields = [self._MakeFieldDescriptor(field, desc_name, index) for index, field in enumerate(desc_proto.field)] - extensions = [self._MakeFieldDescriptor(extension, desc_name, True) - for index, extension in enumerate(desc_proto.extension)] + extensions = [ + self._MakeFieldDescriptor(extension, desc_name, index, + is_extension=True) + for index, extension in enumerate(desc_proto.extension)] + oneofs = [ + descriptor.OneofDescriptor(desc.name, '.'.join((desc_name, desc.name)), + index, None, [], desc.options) + for index, desc in enumerate(desc_proto.oneof_decl)] extension_ranges = [(r.start, r.end) for r in desc_proto.extension_range] if extension_ranges: is_extendable = True @@ -275,6 +459,7 @@ class DescriptorPool(object): filename=file_name, containing_type=None, fields=fields, + oneofs=oneofs, nested_types=nested, enum_types=enums, extensions=extensions, @@ -283,13 +468,19 @@ class DescriptorPool(object): extension_ranges=extension_ranges, file=file_desc, serialized_start=None, - serialized_end=None) + serialized_end=None, + syntax=syntax) for nested in desc.nested_types: nested.containing_type = desc for enum in desc.enum_types: enum.containing_type = desc - scope[desc_proto.name] = desc - scope['.' + desc_name] = desc + for field_index, field_desc in enumerate(desc_proto.field): + if field_desc.HasField('oneof_index'): + oneof_index = field_desc.oneof_index + oneofs[oneof_index].fields.append(fields[field_index]) + fields[field_index].containing_oneof = oneofs[oneof_index] + + scope[_PrefixWithDot(desc_name)] = desc self._descriptors[desc_name] = desc return desc @@ -327,7 +518,6 @@ class DescriptorPool(object): values=values, containing_type=containing_type, options=enum_proto.options) - scope[enum_proto.name] = desc scope['.%s' % enum_name] = desc self._enum_descriptors[enum_name] = desc return desc @@ -374,65 +564,107 @@ class DescriptorPool(object): extension_scope=None, options=field_proto.options) - def _SetFieldTypes(self, desc_proto, scope): - """Sets the field's type, cpp_type, message_type and enum_type. + def _SetAllFieldTypes(self, package, desc_proto, scope): + """Sets all the descriptor's fields's types. + + This method also sets the containing types on any extensions. Args: + package: The current package of desc_proto. desc_proto: The message descriptor to update. scope: Enclosing scope of available types. """ - desc = scope[desc_proto.name] - for field_proto, field_desc in zip(desc_proto.field, desc.fields): - if field_proto.type_name: - type_name = field_proto.type_name - if type_name not in scope: - type_name = '.' + type_name - desc = scope[type_name] - else: - desc = None + package = _PrefixWithDot(package) - if not field_proto.HasField('type'): - if isinstance(desc, descriptor.Descriptor): - field_proto.type = descriptor.FieldDescriptor.TYPE_MESSAGE - else: - field_proto.type = descriptor.FieldDescriptor.TYPE_ENUM - - field_desc.cpp_type = descriptor.FieldDescriptor.ProtoTypeToCppProtoType( - field_proto.type) - - if (field_proto.type == descriptor.FieldDescriptor.TYPE_MESSAGE - or field_proto.type == descriptor.FieldDescriptor.TYPE_GROUP): - field_desc.message_type = desc - - if field_proto.type == descriptor.FieldDescriptor.TYPE_ENUM: - field_desc.enum_type = desc - - if field_proto.label == descriptor.FieldDescriptor.LABEL_REPEATED: - field_desc.has_default = False - field_desc.default_value = [] - elif field_proto.HasField('default_value'): - field_desc.has_default = True - if (field_proto.type == descriptor.FieldDescriptor.TYPE_DOUBLE or - field_proto.type == descriptor.FieldDescriptor.TYPE_FLOAT): - field_desc.default_value = float(field_proto.default_value) - elif field_proto.type == descriptor.FieldDescriptor.TYPE_STRING: - field_desc.default_value = field_proto.default_value - elif field_proto.type == descriptor.FieldDescriptor.TYPE_BOOL: - field_desc.default_value = field_proto.default_value.lower() == 'true' - elif field_proto.type == descriptor.FieldDescriptor.TYPE_ENUM: - field_desc.default_value = field_desc.enum_type.values_by_name[ - field_proto.default_value].index - else: - field_desc.default_value = int(field_proto.default_value) - else: - field_desc.has_default = False - field_desc.default_value = None + main_desc = self._GetTypeFromScope(package, desc_proto.name, scope) + + if package == '.': + nested_package = _PrefixWithDot(desc_proto.name) + else: + nested_package = '.'.join([package, desc_proto.name]) - field_desc.type = field_proto.type + for field_proto, field_desc in zip(desc_proto.field, main_desc.fields): + self._SetFieldType(field_proto, field_desc, nested_package, scope) + + for extension_proto, extension_desc in ( + zip(desc_proto.extension, main_desc.extensions)): + extension_desc.containing_type = self._GetTypeFromScope( + nested_package, extension_proto.extendee, scope) + self._SetFieldType(extension_proto, extension_desc, nested_package, scope) for nested_type in desc_proto.nested_type: - self._SetFieldTypes(nested_type, scope) + self._SetAllFieldTypes(nested_package, nested_type, scope) + + def _SetFieldType(self, field_proto, field_desc, package, scope): + """Sets the field's type, cpp_type, message_type and enum_type. + + Args: + field_proto: Data about the field in proto format. + field_desc: The descriptor to modiy. + package: The package the field's container is in. + scope: Enclosing scope of available types. + """ + if field_proto.type_name: + desc = self._GetTypeFromScope(package, field_proto.type_name, scope) + else: + desc = None + + if not field_proto.HasField('type'): + if isinstance(desc, descriptor.Descriptor): + field_proto.type = descriptor.FieldDescriptor.TYPE_MESSAGE + else: + field_proto.type = descriptor.FieldDescriptor.TYPE_ENUM + + field_desc.cpp_type = descriptor.FieldDescriptor.ProtoTypeToCppProtoType( + field_proto.type) + + if (field_proto.type == descriptor.FieldDescriptor.TYPE_MESSAGE + or field_proto.type == descriptor.FieldDescriptor.TYPE_GROUP): + field_desc.message_type = desc + + if field_proto.type == descriptor.FieldDescriptor.TYPE_ENUM: + field_desc.enum_type = desc + + if field_proto.label == descriptor.FieldDescriptor.LABEL_REPEATED: + field_desc.has_default_value = False + field_desc.default_value = [] + elif field_proto.HasField('default_value'): + field_desc.has_default_value = True + if (field_proto.type == descriptor.FieldDescriptor.TYPE_DOUBLE or + field_proto.type == descriptor.FieldDescriptor.TYPE_FLOAT): + field_desc.default_value = float(field_proto.default_value) + elif field_proto.type == descriptor.FieldDescriptor.TYPE_STRING: + field_desc.default_value = field_proto.default_value + elif field_proto.type == descriptor.FieldDescriptor.TYPE_BOOL: + field_desc.default_value = field_proto.default_value.lower() == 'true' + elif field_proto.type == descriptor.FieldDescriptor.TYPE_ENUM: + field_desc.default_value = field_desc.enum_type.values_by_name[ + field_proto.default_value].number + elif field_proto.type == descriptor.FieldDescriptor.TYPE_BYTES: + field_desc.default_value = text_encoding.CUnescape( + field_proto.default_value) + else: + # All other types are of the "int" type. + field_desc.default_value = int(field_proto.default_value) + else: + field_desc.has_default_value = False + if (field_proto.type == descriptor.FieldDescriptor.TYPE_DOUBLE or + field_proto.type == descriptor.FieldDescriptor.TYPE_FLOAT): + field_desc.default_value = 0.0 + elif field_proto.type == descriptor.FieldDescriptor.TYPE_STRING: + field_desc.default_value = u'' + elif field_proto.type == descriptor.FieldDescriptor.TYPE_BOOL: + field_desc.default_value = False + elif field_proto.type == descriptor.FieldDescriptor.TYPE_ENUM: + field_desc.default_value = field_desc.enum_type.values[0].number + elif field_proto.type == descriptor.FieldDescriptor.TYPE_BYTES: + field_desc.default_value = b'' + else: + # All other types are of the "int" type. + field_desc.default_value = 0 + + field_desc.type = field_proto.type def _MakeEnumValueDescriptor(self, value_proto, index): """Creates a enum value descriptor object from a enum value proto. @@ -452,76 +684,131 @@ class DescriptorPool(object): options=value_proto.options, type=None) - def _ExtractSymbols(self, desc_protos, package): - """Pulls out all the symbols from descriptor protos. + def _MakeServiceDescriptor(self, service_proto, service_index, scope, + package, file_desc): + """Make a protobuf ServiceDescriptor given a ServiceDescriptorProto. Args: - desc_protos: The protos to extract symbols from. - package: The package containing the descriptor type. - Yields: - A two element tuple of the type name and descriptor object. + service_proto: The descriptor_pb2.ServiceDescriptorProto protobuf message. + service_index: The index of the service in the File. + scope: Dict mapping short and full symbols to message and enum types. + package: Optional package name for the new message EnumDescriptor. + file_desc: The file containing the service descriptor. + + Returns: + The added descriptor. """ - for desc_proto in desc_protos: - if package: - message_name = '.'.join((package, desc_proto.name)) - else: - message_name = desc_proto.name - message_desc = self.FindMessageTypeByName(message_name) - yield (message_name, message_desc) - for symbol in self._ExtractSymbols(desc_proto.nested_type, message_name): - yield symbol - for symbol in self._ExtractEnums(desc_proto.enum_type, message_name): - yield symbol + if package: + service_name = '.'.join((package, service_proto.name)) + else: + service_name = service_proto.name + + methods = [self._MakeMethodDescriptor(method_proto, service_name, package, + scope, index) + for index, method_proto in enumerate(service_proto.method)] + desc = descriptor.ServiceDescriptor(name=service_proto.name, + full_name=service_name, + index=service_index, + methods=methods, + options=service_proto.options, + file=file_desc) + return desc - def _ExtractEnums(self, enum_protos, package): - """Pulls out all the symbols from enum protos. + def _MakeMethodDescriptor(self, method_proto, service_name, package, scope, + index): + """Creates a method descriptor from a MethodDescriptorProto. Args: - enum_protos: The protos to extract symbols from. - package: The package containing the enum type. + method_proto: The proto describing the method. + service_name: The name of the containing service. + package: Optional package name to look up for types. + scope: Scope containing available types. + index: Index of the method in the service. - Yields: - A two element tuple of the type name and enum descriptor object. + Returns: + An initialized MethodDescriptor object. """ - - for enum_proto in enum_protos: - if package: - enum_name = '.'.join((package, enum_proto.name)) - else: - enum_name = enum_proto.name - enum_desc = self.FindEnumTypeByName(enum_name) - yield (enum_name, enum_desc) - - def _ExtractMessages(self, desc_protos): - """Pulls out all the message protos from descriptos. + full_name = '.'.join((service_name, method_proto.name)) + input_type = self._GetTypeFromScope( + package, method_proto.input_type, scope) + output_type = self._GetTypeFromScope( + package, method_proto.output_type, scope) + return descriptor.MethodDescriptor(name=method_proto.name, + full_name=full_name, + index=index, + containing_service=None, + input_type=input_type, + output_type=output_type, + options=method_proto.options) + + def _ExtractSymbols(self, descriptors): + """Pulls out all the symbols from descriptor protos. Args: - desc_protos: The protos to extract symbols from. - + descriptors: The messages to extract descriptors from. Yields: - Descriptor protos. + A two element tuple of the type name and descriptor object. """ - for desc_proto in desc_protos: - yield desc_proto - for message in self._ExtractMessages(desc_proto.nested_type): - yield message + for desc in descriptors: + yield (_PrefixWithDot(desc.full_name), desc) + for symbol in self._ExtractSymbols(desc.nested_types): + yield symbol + for enum in desc.enum_types: + yield (_PrefixWithDot(enum.full_name), enum) - def _GetDeps(self, file_proto): + def _GetDeps(self, dependencies): """Recursively finds dependencies for file protos. Args: - file_proto: The proto to get dependencies from. + dependencies: The names of the files being depended on. Yields: Each direct and indirect dependency. """ - for dependency in file_proto.dependency: + for dependency in dependencies: dep_desc = self.FindFileByName(dependency) - dep_proto = descriptor_pb2.FileDescriptorProto.FromString( - dep_desc.serialized_pb) - yield dep_proto - for parent_dep in self._GetDeps(dep_proto): + yield dep_desc + for parent_dep in dep_desc.dependencies: yield parent_dep + + def _GetTypeFromScope(self, package, type_name, scope): + """Finds a given type name in the current scope. + + Args: + package: The package the proto should be located in. + type_name: The name of the type to be found in the scope. + scope: Dict mapping short and full symbols to message and enum types. + + Returns: + The descriptor for the requested type. + """ + if type_name not in scope: + components = _PrefixWithDot(package).split('.') + while components: + possible_match = '.'.join(components + [type_name]) + if possible_match in scope: + type_name = possible_match + break + else: + components.pop(-1) + return scope[type_name] + + +def _PrefixWithDot(name): + return name if name.startswith('.') else '.%s' % name + + +if _USE_C_DESCRIPTORS: + # TODO(amauryfa): This pool could be constructed from Python code, when we + # support a flag like 'use_cpp_generated_pool=True'. + # pylint: disable=protected-access + _DEFAULT = descriptor._message.default_pool +else: + _DEFAULT = DescriptorPool() + + +def Default(): + return _DEFAULT |