two version of R2R are here HEAD master

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diff --git a/.venv/lib/python3.12/site-packages/google/protobuf/descriptor_pool.py b/.venv/lib/python3.12/site-packages/google/protobuf/descriptor_pool.py
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+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""Provides DescriptorPool to use as a container for proto2 descriptors.
+
+The DescriptorPool is used in conjection with a DescriptorDatabase to maintain
+a collection of protocol buffer descriptors for use when dynamically creating
+message types at runtime.
+
+For most applications protocol buffers should be used via modules generated by
+the protocol buffer compiler tool. This should only be used when the type of
+protocol buffers used in an application or library cannot be predetermined.
+
+Below is a straightforward example on how to use this class::
+
+  pool = DescriptorPool()
+  file_descriptor_protos = [ ... ]
+  for file_descriptor_proto in file_descriptor_protos:
+    pool.Add(file_descriptor_proto)
+  my_message_descriptor = pool.FindMessageTypeByName('some.package.MessageType')
+
+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)'
+
+import collections
+import threading
+import warnings
+
+from google.protobuf import descriptor
+from google.protobuf import descriptor_database
+from google.protobuf import text_encoding
+from google.protobuf.internal import python_edition_defaults
+from google.protobuf.internal import python_message
+
+_USE_C_DESCRIPTORS = descriptor._USE_C_DESCRIPTORS  # pylint: disable=protected-access
+
+
+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 (str): The fully-qualified symbol name.
+
+  Returns:
+    str: The normalized fully-qualified symbol name.
+  """
+  return name.lstrip('.')
+
+
+def _OptionsOrNone(descriptor_proto):
+  """Returns the value of the field `options`, or None if it is not set."""
+  if descriptor_proto.HasField('options'):
+    return descriptor_proto.options
+  else:
+    return None
+
+
+def _IsMessageSetExtension(field):
+  return (field.is_extension and
+          field.containing_type.has_options and
+          field.containing_type.GetOptions().message_set_wire_format and
+          field.type == descriptor.FieldDescriptor.TYPE_MESSAGE and
+          field.label == descriptor.FieldDescriptor.LABEL_OPTIONAL)
+
+_edition_defaults_lock = threading.Lock()
+
+
+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, use_deprecated_legacy_json_field_conflicts=False
+  ):
+    """Initializes a Pool of proto buffs.
+
+    The descriptor_db argument to the constructor is provided to allow
+    specialized file descriptor proto lookup code to be triggered on demand. An
+    example would be an implementation which will read and compile a file
+    specified in a call to FindFileByName() and not require the call to Add()
+    at all. Results from this database will be cached internally here as well.
+
+    Args:
+      descriptor_db: A secondary source of file descriptors.
+      use_deprecated_legacy_json_field_conflicts: Unused, for compatibility with
+        C++.
+    """
+
+    self._internal_db = descriptor_database.DescriptorDatabase()
+    self._descriptor_db = descriptor_db
+    self._descriptors = {}
+    self._enum_descriptors = {}
+    self._service_descriptors = {}
+    self._file_descriptors = {}
+    self._toplevel_extensions = {}
+    self._top_enum_values = {}
+    # We store extensions in two two-level mappings: The first key is the
+    # descriptor of the message being extended, the second key is the extension
+    # full name or its tag number.
+    self._extensions_by_name = collections.defaultdict(dict)
+    self._extensions_by_number = collections.defaultdict(dict)
+    self._serialized_edition_defaults = (
+        python_edition_defaults._PROTOBUF_INTERNAL_PYTHON_EDITION_DEFAULTS
+    )
+    self._edition_defaults = None
+    self._feature_cache = dict()
+
+  def _CheckConflictRegister(self, desc, desc_name, file_name):
+    """Check if the descriptor name conflicts with another of the same name.
+
+    Args:
+      desc: Descriptor of a message, enum, service, extension or enum value.
+      desc_name (str): the full name of desc.
+      file_name (str): The file name of descriptor.
+    """
+    for register, descriptor_type in [
+        (self._descriptors, descriptor.Descriptor),
+        (self._enum_descriptors, descriptor.EnumDescriptor),
+        (self._service_descriptors, descriptor.ServiceDescriptor),
+        (self._toplevel_extensions, descriptor.FieldDescriptor),
+        (self._top_enum_values, descriptor.EnumValueDescriptor)]:
+      if desc_name in register:
+        old_desc = register[desc_name]
+        if isinstance(old_desc, descriptor.EnumValueDescriptor):
+          old_file = old_desc.type.file.name
+        else:
+          old_file = old_desc.file.name
+
+        if not isinstance(desc, descriptor_type) or (
+            old_file != file_name):
+          error_msg = ('Conflict register for file "' + file_name +
+                       '": ' + desc_name +
+                       ' is already defined in file "' +
+                       old_file + '". Please fix the conflict by adding '
+                       'package name on the proto file, or use different '
+                       'name for the duplication.')
+          if isinstance(desc, descriptor.EnumValueDescriptor):
+            error_msg += ('\nNote: enum values appear as '
+                          'siblings of the enum type instead of '
+                          'children of it.')
+
+          raise TypeError(error_msg)
+
+        return
+
+  def Add(self, file_desc_proto):
+    """Adds the FileDescriptorProto and its types to this pool.
+
+    Args:
+      file_desc_proto (FileDescriptorProto): The file descriptor to add.
+    """
+
+    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 (bytes): A bytes string, serialization of the
+        :class:`FileDescriptorProto` to add.
+
+    Returns:
+      FileDescriptor: Descriptor for the added file.
+    """
+
+    # pylint: disable=g-import-not-at-top
+    from google.protobuf import descriptor_pb2
+    file_desc_proto = descriptor_pb2.FileDescriptorProto.FromString(
+        serialized_file_desc_proto)
+    file_desc = self._ConvertFileProtoToFileDescriptor(file_desc_proto)
+    file_desc.serialized_pb = serialized_file_desc_proto
+    return file_desc
+
+  # Never call this method. It is for internal usage only.
+  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._CheckConflictRegister(desc, desc.full_name, desc.file.name)
+
+    self._descriptors[desc.full_name] = desc
+    self._AddFileDescriptor(desc.file)
+
+  # Never call this method. It is for internal usage only.
+  def _AddEnumDescriptor(self, enum_desc):
+    """Adds an EnumDescriptor to the pool.
+
+    This method also registers the FileDescriptor associated with the enum.
+
+    Args:
+      enum_desc: An EnumDescriptor.
+    """
+
+    if not isinstance(enum_desc, descriptor.EnumDescriptor):
+      raise TypeError('Expected instance of descriptor.EnumDescriptor.')
+
+    file_name = enum_desc.file.name
+    self._CheckConflictRegister(enum_desc, enum_desc.full_name, file_name)
+    self._enum_descriptors[enum_desc.full_name] = enum_desc
+
+    # Top enum values need to be indexed.
+    # Count the number of dots to see whether the enum is toplevel or nested
+    # in a message. We cannot use enum_desc.containing_type at this stage.
+    if enum_desc.file.package:
+      top_level = (enum_desc.full_name.count('.')
+                   - enum_desc.file.package.count('.') == 1)
+    else:
+      top_level = enum_desc.full_name.count('.') == 0
+    if top_level:
+      file_name = enum_desc.file.name
+      package = enum_desc.file.package
+      for enum_value in enum_desc.values:
+        full_name = _NormalizeFullyQualifiedName(
+            '.'.join((package, enum_value.name)))
+        self._CheckConflictRegister(enum_value, full_name, file_name)
+        self._top_enum_values[full_name] = enum_value
+    self._AddFileDescriptor(enum_desc.file)
+
+  # Never call this method. It is for internal usage only.
+  def _AddServiceDescriptor(self, service_desc):
+    """Adds a ServiceDescriptor to the pool.
+
+    Args:
+      service_desc: A ServiceDescriptor.
+    """
+
+    if not isinstance(service_desc, descriptor.ServiceDescriptor):
+      raise TypeError('Expected instance of descriptor.ServiceDescriptor.')
+
+    self._CheckConflictRegister(service_desc, service_desc.full_name,
+                                service_desc.file.name)
+    self._service_descriptors[service_desc.full_name] = service_desc
+
+  # Never call this method. It is for internal usage only.
+  def _AddExtensionDescriptor(self, extension):
+    """Adds a FieldDescriptor describing an extension to the pool.
+
+    Args:
+      extension: A FieldDescriptor.
+
+    Raises:
+      AssertionError: when another extension with the same number extends the
+        same message.
+      TypeError: when the specified extension is not a
+        descriptor.FieldDescriptor.
+    """
+    if not (isinstance(extension, descriptor.FieldDescriptor) and
+            extension.is_extension):
+      raise TypeError('Expected an extension descriptor.')
+
+    if extension.extension_scope is None:
+      self._CheckConflictRegister(
+          extension, extension.full_name, extension.file.name)
+      self._toplevel_extensions[extension.full_name] = extension
+
+    try:
+      existing_desc = self._extensions_by_number[
+          extension.containing_type][extension.number]
+    except KeyError:
+      pass
+    else:
+      if extension is not existing_desc:
+        raise AssertionError(
+            'Extensions "%s" and "%s" both try to extend message type "%s" '
+            'with field number %d.' %
+            (extension.full_name, existing_desc.full_name,
+             extension.containing_type.full_name, extension.number))
+
+    self._extensions_by_number[extension.containing_type][
+        extension.number] = extension
+    self._extensions_by_name[extension.containing_type][
+        extension.full_name] = extension
+
+    # Also register MessageSet extensions with the type name.
+    if _IsMessageSetExtension(extension):
+      self._extensions_by_name[extension.containing_type][
+          extension.message_type.full_name] = extension
+
+    if hasattr(extension.containing_type, '_concrete_class'):
+      python_message._AttachFieldHelpers(
+          extension.containing_type._concrete_class, extension)
+
+  # Never call this method. It is for internal usage only.
+  def _InternalAddFileDescriptor(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.
+    """
+
+    self._AddFileDescriptor(file_desc)
+
+  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.
+
+    Args:
+      file_name (str): The path to the file to get a descriptor for.
+
+    Returns:
+      FileDescriptor: The descriptor for the named file.
+
+    Raises:
+      KeyError: if the file cannot be found in the pool.
+    """
+
+    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:
+        file_proto = self._descriptor_db.FindFileByName(file_name)
+      else:
+        raise error
+    if not file_proto:
+      raise KeyError('Cannot find a file named %s' % file_name)
+    return self._ConvertFileProtoToFileDescriptor(file_proto)
+
+  def FindFileContainingSymbol(self, symbol):
+    """Gets the FileDescriptor for the file containing the specified symbol.
+
+    Args:
+      symbol (str): The name of the symbol to search for.
+
+    Returns:
+      FileDescriptor: Descriptor for the file that contains the specified
+      symbol.
+
+    Raises:
+      KeyError: if the file cannot be found in the pool.
+    """
+
+    symbol = _NormalizeFullyQualifiedName(symbol)
+    try:
+      return self._InternalFindFileContainingSymbol(symbol)
+    except KeyError:
+      pass
+
+    try:
+      # Try fallback database. Build and find again if possible.
+      self._FindFileContainingSymbolInDb(symbol)
+      return self._InternalFindFileContainingSymbol(symbol)
+    except KeyError:
+      raise KeyError('Cannot find a file containing %s' % symbol)
+
+  def _InternalFindFileContainingSymbol(self, symbol):
+    """Gets the already built FileDescriptor containing the specified symbol.
+
+    Args:
+      symbol (str): The name of the symbol to search for.
+
+    Returns:
+      FileDescriptor: Descriptor for the file that contains the specified
+      symbol.
+
+    Raises:
+      KeyError: if the file cannot be found in the pool.
+    """
+    try:
+      return self._descriptors[symbol].file
+    except KeyError:
+      pass
+
+    try:
+      return self._enum_descriptors[symbol].file
+    except KeyError:
+      pass
+
+    try:
+      return self._service_descriptors[symbol].file
+    except KeyError:
+      pass
+
+    try:
+      return self._top_enum_values[symbol].type.file
+    except KeyError:
+      pass
+
+    try:
+      return self._toplevel_extensions[symbol].file
+    except KeyError:
+      pass
+
+    # Try fields, enum values and nested extensions inside a message.
+    top_name, _, sub_name = symbol.rpartition('.')
+    try:
+      message = self.FindMessageTypeByName(top_name)
+      assert (sub_name in message.extensions_by_name or
+              sub_name in message.fields_by_name or
+              sub_name in message.enum_values_by_name)
+      return message.file
+    except (KeyError, AssertionError):
+      raise KeyError('Cannot find a file containing %s' % symbol)
+
+  def FindMessageTypeByName(self, full_name):
+    """Loads the named descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the descriptor to load.
+
+    Returns:
+      Descriptor: The descriptor for the named type.
+
+    Raises:
+      KeyError: if the message cannot be found in the pool.
+    """
+
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    if full_name not in self._descriptors:
+      self._FindFileContainingSymbolInDb(full_name)
+    return self._descriptors[full_name]
+
+  def FindEnumTypeByName(self, full_name):
+    """Loads the named enum descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the enum descriptor to load.
+
+    Returns:
+      EnumDescriptor: The enum descriptor for the named type.
+
+    Raises:
+      KeyError: if the enum cannot be found in the pool.
+    """
+
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    if full_name not in self._enum_descriptors:
+      self._FindFileContainingSymbolInDb(full_name)
+    return self._enum_descriptors[full_name]
+
+  def FindFieldByName(self, full_name):
+    """Loads the named field descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the field descriptor to load.
+
+    Returns:
+      FieldDescriptor: The field descriptor for the named field.
+
+    Raises:
+      KeyError: if the field cannot be found in the pool.
+    """
+    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 FindOneofByName(self, full_name):
+    """Loads the named oneof descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the oneof descriptor to load.
+
+    Returns:
+      OneofDescriptor: The oneof descriptor for the named oneof.
+
+    Raises:
+      KeyError: if the oneof cannot be found in the pool.
+    """
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    message_name, _, oneof_name = full_name.rpartition('.')
+    message_descriptor = self.FindMessageTypeByName(message_name)
+    return message_descriptor.oneofs_by_name[oneof_name]
+
+  def FindExtensionByName(self, full_name):
+    """Loads the named extension descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the extension descriptor to load.
+
+    Returns:
+      FieldDescriptor: The field descriptor for the named extension.
+
+    Raises:
+      KeyError: if the extension cannot be found in the pool.
+    """
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    try:
+      # The proto compiler does not give any link between the FileDescriptor
+      # and top-level extensions unless the FileDescriptorProto is added to
+      # the DescriptorDatabase, but this can impact memory usage.
+      # So we registered these extensions by name explicitly.
+      return self._toplevel_extensions[full_name]
+    except KeyError:
+      pass
+    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._FindFileContainingSymbolInDb(full_name)
+    return scope.extensions_by_name[extension_name]
+
+  def FindExtensionByNumber(self, message_descriptor, number):
+    """Gets the extension of the specified message with the specified number.
+
+    Extensions have to be registered to this pool by calling :func:`Add` or
+    :func:`AddExtensionDescriptor`.
+
+    Args:
+      message_descriptor (Descriptor): descriptor of the extended message.
+      number (int): Number of the extension field.
+
+    Returns:
+      FieldDescriptor: The descriptor for the extension.
+
+    Raises:
+      KeyError: when no extension with the given number is known for the
+        specified message.
+    """
+    try:
+      return self._extensions_by_number[message_descriptor][number]
+    except KeyError:
+      self._TryLoadExtensionFromDB(message_descriptor, number)
+      return self._extensions_by_number[message_descriptor][number]
+
+  def FindAllExtensions(self, message_descriptor):
+    """Gets all the known extensions of a given message.
+
+    Extensions have to be registered to this pool by build related
+    :func:`Add` or :func:`AddExtensionDescriptor`.
+
+    Args:
+      message_descriptor (Descriptor): Descriptor of the extended message.
+
+    Returns:
+      list[FieldDescriptor]: Field descriptors describing the extensions.
+    """
+    # Fallback to descriptor db if FindAllExtensionNumbers is provided.
+    if self._descriptor_db and hasattr(
+        self._descriptor_db, 'FindAllExtensionNumbers'):
+      full_name = message_descriptor.full_name
+      all_numbers = self._descriptor_db.FindAllExtensionNumbers(full_name)
+      for number in all_numbers:
+        if number in self._extensions_by_number[message_descriptor]:
+          continue
+        self._TryLoadExtensionFromDB(message_descriptor, number)
+
+    return list(self._extensions_by_number[message_descriptor].values())
+
+  def _TryLoadExtensionFromDB(self, message_descriptor, number):
+    """Try to Load extensions from descriptor db.
+
+    Args:
+      message_descriptor: descriptor of the extended message.
+      number: the extension number that needs to be loaded.
+    """
+    if not self._descriptor_db:
+      return
+    # Only supported when FindFileContainingExtension is provided.
+    if not hasattr(
+        self._descriptor_db, 'FindFileContainingExtension'):
+      return
+
+    full_name = message_descriptor.full_name
+    file_proto = self._descriptor_db.FindFileContainingExtension(
+        full_name, number)
+
+    if file_proto is None:
+      return
+
+    try:
+      self._ConvertFileProtoToFileDescriptor(file_proto)
+    except:
+      warn_msg = ('Unable to load proto file %s for extension number %d.' %
+                  (file_proto.name, number))
+      warnings.warn(warn_msg, RuntimeWarning)
+
+  def FindServiceByName(self, full_name):
+    """Loads the named service descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the service descriptor to load.
+
+    Returns:
+      ServiceDescriptor: The service descriptor for the named service.
+
+    Raises:
+      KeyError: if the service cannot be found in the pool.
+    """
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    if full_name not in self._service_descriptors:
+      self._FindFileContainingSymbolInDb(full_name)
+    return self._service_descriptors[full_name]
+
+  def FindMethodByName(self, full_name):
+    """Loads the named service method descriptor from the pool.
+
+    Args:
+      full_name (str): The full name of the method descriptor to load.
+
+    Returns:
+      MethodDescriptor: The method descriptor for the service method.
+
+    Raises:
+      KeyError: if the method cannot be found in the pool.
+    """
+    full_name = _NormalizeFullyQualifiedName(full_name)
+    service_name, _, method_name = full_name.rpartition('.')
+    service_descriptor = self.FindServiceByName(service_name)
+    return service_descriptor.methods_by_name[method_name]
+
+  def SetFeatureSetDefaults(self, defaults):
+    """Sets the default feature mappings used during the build.
+
+    Args:
+      defaults: a FeatureSetDefaults message containing the new mappings.
+    """
+    if self._edition_defaults is not None:
+      raise ValueError(
+          "Feature set defaults can't be changed once the pool has started"
+          ' building!'
+      )
+
+    # pylint: disable=g-import-not-at-top
+    from google.protobuf import descriptor_pb2
+
+    if not isinstance(defaults, descriptor_pb2.FeatureSetDefaults):
+      raise TypeError('SetFeatureSetDefaults called with invalid type')
+
+
+    if defaults.minimum_edition > defaults.maximum_edition:
+      raise ValueError(
+          'Invalid edition range %s to %s'
+          % (
+              descriptor_pb2.Edition.Name(defaults.minimum_edition),
+              descriptor_pb2.Edition.Name(defaults.maximum_edition),
+          )
+      )
+
+    prev_edition = descriptor_pb2.Edition.EDITION_UNKNOWN
+    for d in defaults.defaults:
+      if d.edition == descriptor_pb2.Edition.EDITION_UNKNOWN:
+        raise ValueError('Invalid edition EDITION_UNKNOWN specified')
+      if prev_edition >= d.edition:
+        raise ValueError(
+            'Feature set defaults are not strictly increasing.  %s is greater'
+            ' than or equal to %s'
+            % (
+                descriptor_pb2.Edition.Name(prev_edition),
+                descriptor_pb2.Edition.Name(d.edition),
+            )
+        )
+      prev_edition = d.edition
+    self._edition_defaults = defaults
+
+  def _CreateDefaultFeatures(self, edition):
+    """Creates a FeatureSet message with defaults for a specific edition.
+
+    Args:
+      edition: the edition to generate defaults for.
+
+    Returns:
+      A FeatureSet message with defaults for a specific edition.
+    """
+    # pylint: disable=g-import-not-at-top
+    from google.protobuf import descriptor_pb2
+
+    with _edition_defaults_lock:
+      if not self._edition_defaults:
+        self._edition_defaults = descriptor_pb2.FeatureSetDefaults()
+        self._edition_defaults.ParseFromString(
+            self._serialized_edition_defaults
+        )
+
+    if edition < self._edition_defaults.minimum_edition:
+      raise TypeError(
+          'Edition %s is earlier than the minimum supported edition %s!'
+          % (
+              descriptor_pb2.Edition.Name(edition),
+              descriptor_pb2.Edition.Name(
+                  self._edition_defaults.minimum_edition
+              ),
+          )
+      )
+    if edition > self._edition_defaults.maximum_edition:
+      raise TypeError(
+          'Edition %s is later than the maximum supported edition %s!'
+          % (
+              descriptor_pb2.Edition.Name(edition),
+              descriptor_pb2.Edition.Name(
+                  self._edition_defaults.maximum_edition
+              ),
+          )
+      )
+    found = None
+    for d in self._edition_defaults.defaults:
+      if d.edition > edition:
+        break
+      found = d
+    if found is None:
+      raise TypeError(
+          'No valid default found for edition %s!'
+          % descriptor_pb2.Edition.Name(edition)
+      )
+
+    defaults = descriptor_pb2.FeatureSet()
+    defaults.CopyFrom(found.fixed_features)
+    defaults.MergeFrom(found.overridable_features)
+    return defaults
+
+  def _InternFeatures(self, features):
+    serialized = features.SerializeToString()
+    with _edition_defaults_lock:
+      cached = self._feature_cache.get(serialized)
+      if cached is None:
+        self._feature_cache[serialized] = features
+        cached = features
+    return cached
+
+  def _FindFileContainingSymbolInDb(self, symbol):
+    """Finds the file in descriptor DB containing the specified symbol.
+
+    Args:
+      symbol (str): The name of the symbol to search for.
+
+    Returns:
+      FileDescriptor: The file that contains the specified symbol.
+
+    Raises:
+      KeyError: if the file cannot be found in the descriptor database.
+    """
+    try:
+      file_proto = self._internal_db.FindFileContainingSymbol(symbol)
+    except KeyError as error:
+      if self._descriptor_db:
+        file_proto = self._descriptor_db.FindFileContainingSymbol(symbol)
+      else:
+        raise error
+    if not file_proto:
+      raise KeyError('Cannot find a file containing %s' % symbol)
+    return self._ConvertFileProtoToFileDescriptor(file_proto)
+
+  def _ConvertFileProtoToFileDescriptor(self, file_proto):
+    """Creates a FileDescriptor from a proto or returns a cached copy.
+
+    This method also has the side effect of loading all the symbols found in
+    the file into the appropriate dictionaries in the pool.
+
+    Args:
+      file_proto: The proto to convert.
+
+    Returns:
+      A FileDescriptor matching the passed in proto.
+    """
+    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]
+
+      # pylint: disable=g-import-not-at-top
+      from google.protobuf import descriptor_pb2
+
+      file_descriptor = descriptor.FileDescriptor(
+          pool=self,
+          name=file_proto.name,
+          package=file_proto.package,
+          syntax=file_proto.syntax,
+          edition=descriptor_pb2.Edition.Name(file_proto.edition),
+          options=_OptionsOrNone(file_proto),
+          serialized_pb=file_proto.SerializeToString(),
+          dependencies=direct_deps,
+          public_dependencies=public_deps,
+          # pylint: disable=protected-access
+          create_key=descriptor._internal_create_key,
+      )
+      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, True))
+
+      for index, extension_proto in enumerate(file_proto.extension):
+        extension_desc = self._MakeFieldDescriptor(
+            extension_proto, file_proto.package, index, file_descriptor,
+            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._file_descriptors[file_proto.name] = file_descriptor
+
+    # Add extensions to the pool
+    def AddExtensionForNested(message_type):
+      for nested in message_type.nested_types:
+        AddExtensionForNested(nested)
+      for extension in message_type.extensions:
+        self._AddExtensionDescriptor(extension)
+
+    file_desc = self._file_descriptors[file_proto.name]
+    for extension in file_desc.extensions_by_name.values():
+      self._AddExtensionDescriptor(extension)
+    for message_type in file_desc.message_types_by_name.values():
+      AddExtensionForNested(message_type)
+
+    return file_desc
+
+  def _ConvertMessageDescriptor(self, desc_proto, package=None, file_desc=None,
+                                scope=None, syntax=None):
+    """Adds the proto to the pool in the specified package.
+
+    Args:
+      desc_proto: The descriptor_pb2.DescriptorProto protobuf message.
+      package: The package the proto should be located in.
+      file_desc: The file containing this message.
+      scope: Dict mapping short and full symbols to message and enum types.
+      syntax: string indicating syntax of the file ("proto2" or "proto3")
+
+    Returns:
+      The added descriptor.
+    """
+
+    if package:
+      desc_name = '.'.join((package, desc_proto.name))
+    else:
+      desc_name = desc_proto.name
+
+    if file_desc is None:
+      file_name = None
+    else:
+      file_name = file_desc.name
+
+    if scope is None:
+      scope = {}
+
+    nested = [
+        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, False)
+        for enum in desc_proto.enum_type]
+    fields = [self._MakeFieldDescriptor(field, desc_name, index, file_desc)
+              for index, field in enumerate(desc_proto.field)]
+    extensions = [
+        self._MakeFieldDescriptor(extension, desc_name, index, file_desc,
+                                  is_extension=True)
+        for index, extension in enumerate(desc_proto.extension)]
+    oneofs = [
+        # pylint: disable=g-complex-comprehension
+        descriptor.OneofDescriptor(
+            desc.name,
+            '.'.join((desc_name, desc.name)),
+            index,
+            None,
+            [],
+            _OptionsOrNone(desc),
+            # pylint: disable=protected-access
+            create_key=descriptor._internal_create_key)
+        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
+    else:
+      is_extendable = False
+    desc = descriptor.Descriptor(
+        name=desc_proto.name,
+        full_name=desc_name,
+        filename=file_name,
+        containing_type=None,
+        fields=fields,
+        oneofs=oneofs,
+        nested_types=nested,
+        enum_types=enums,
+        extensions=extensions,
+        options=_OptionsOrNone(desc_proto),
+        is_extendable=is_extendable,
+        extension_ranges=extension_ranges,
+        file=file_desc,
+        serialized_start=None,
+        serialized_end=None,
+        is_map_entry=desc_proto.options.map_entry,
+        # pylint: disable=protected-access
+        create_key=descriptor._internal_create_key,
+    )
+    for nested in desc.nested_types:
+      nested.containing_type = desc
+    for enum in desc.enum_types:
+      enum.containing_type = 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._CheckConflictRegister(desc, desc.full_name, desc.file.name)
+    self._descriptors[desc_name] = desc
+    return desc
+
+  def _ConvertEnumDescriptor(self, enum_proto, package=None, file_desc=None,
+                             containing_type=None, scope=None, top_level=False):
+    """Make a protobuf EnumDescriptor given an EnumDescriptorProto protobuf.
+
+    Args:
+      enum_proto: The descriptor_pb2.EnumDescriptorProto protobuf message.
+      package: Optional package name for the new message EnumDescriptor.
+      file_desc: The file containing the enum descriptor.
+      containing_type: The type containing this enum.
+      scope: Scope containing available types.
+      top_level: If True, the enum is a top level symbol. If False, the enum
+          is defined inside a message.
+
+    Returns:
+      The added descriptor
+    """
+
+    if package:
+      enum_name = '.'.join((package, enum_proto.name))
+    else:
+      enum_name = enum_proto.name
+
+    if file_desc is None:
+      file_name = None
+    else:
+      file_name = file_desc.name
+
+    values = [self._MakeEnumValueDescriptor(value, index)
+              for index, value in enumerate(enum_proto.value)]
+    desc = descriptor.EnumDescriptor(name=enum_proto.name,
+                                     full_name=enum_name,
+                                     filename=file_name,
+                                     file=file_desc,
+                                     values=values,
+                                     containing_type=containing_type,
+                                     options=_OptionsOrNone(enum_proto),
+                                     # pylint: disable=protected-access
+                                     create_key=descriptor._internal_create_key)
+    scope['.%s' % enum_name] = desc
+    self._CheckConflictRegister(desc, desc.full_name, desc.file.name)
+    self._enum_descriptors[enum_name] = desc
+
+    # Add top level enum values.
+    if top_level:
+      for value in values:
+        full_name = _NormalizeFullyQualifiedName(
+            '.'.join((package, value.name)))
+        self._CheckConflictRegister(value, full_name, file_name)
+        self._top_enum_values[full_name] = value
+
+    return desc
+
+  def _MakeFieldDescriptor(self, field_proto, message_name, index,
+                           file_desc, is_extension=False):
+    """Creates a field descriptor from a FieldDescriptorProto.
+
+    For message and enum type fields, this method will do a look up
+    in the pool for the appropriate descriptor for that type. If it
+    is unavailable, it will fall back to the _source function to
+    create it. If this type is still unavailable, construction will
+    fail.
+
+    Args:
+      field_proto: The proto describing the field.
+      message_name: The name of the containing message.
+      index: Index of the field
+      file_desc: The file containing the field descriptor.
+      is_extension: Indication that this field is for an extension.
+
+    Returns:
+      An initialized FieldDescriptor object
+    """
+
+    if message_name:
+      full_name = '.'.join((message_name, field_proto.name))
+    else:
+      full_name = field_proto.name
+
+    if field_proto.json_name:
+      json_name = field_proto.json_name
+    else:
+      json_name = None
+
+    return descriptor.FieldDescriptor(
+        name=field_proto.name,
+        full_name=full_name,
+        index=index,
+        number=field_proto.number,
+        type=field_proto.type,
+        cpp_type=None,
+        message_type=None,
+        enum_type=None,
+        containing_type=None,
+        label=field_proto.label,
+        has_default_value=False,
+        default_value=None,
+        is_extension=is_extension,
+        extension_scope=None,
+        options=_OptionsOrNone(field_proto),
+        json_name=json_name,
+        file=file_desc,
+        # pylint: disable=protected-access
+        create_key=descriptor._internal_create_key)
+
+  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.
+    """
+
+    package = _PrefixWithDot(package)
+
+    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])
+
+    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._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 modify.
+      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)
+      elif field_proto.type == descriptor.FieldDescriptor.TYPE_MESSAGE:
+        field_desc.default_value = None
+      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''
+      elif field_proto.type == descriptor.FieldDescriptor.TYPE_MESSAGE:
+        field_desc.default_value = None
+      elif field_proto.type == descriptor.FieldDescriptor.TYPE_GROUP:
+        field_desc.default_value = None
+      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.
+
+    Args:
+      value_proto: The proto describing the enum value.
+      index: The index of the enum value.
+
+    Returns:
+      An initialized EnumValueDescriptor object.
+    """
+
+    return descriptor.EnumValueDescriptor(
+        name=value_proto.name,
+        index=index,
+        number=value_proto.number,
+        options=_OptionsOrNone(value_proto),
+        type=None,
+        # pylint: disable=protected-access
+        create_key=descriptor._internal_create_key)
+
+  def _MakeServiceDescriptor(self, service_proto, service_index, scope,
+                             package, file_desc):
+    """Make a protobuf ServiceDescriptor given a ServiceDescriptorProto.
+
+    Args:
+      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.
+    """
+
+    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=_OptionsOrNone(service_proto),
+        file=file_desc,
+        # pylint: disable=protected-access
+        create_key=descriptor._internal_create_key)
+    self._CheckConflictRegister(desc, desc.full_name, desc.file.name)
+    self._service_descriptors[service_name] = desc
+    return desc
+
+  def _MakeMethodDescriptor(self, method_proto, service_name, package, scope,
+                            index):
+    """Creates a method descriptor from a MethodDescriptorProto.
+
+    Args:
+      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.
+
+    Returns:
+      An initialized MethodDescriptor object.
+    """
+    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,
+        client_streaming=method_proto.client_streaming,
+        server_streaming=method_proto.server_streaming,
+        options=_OptionsOrNone(method_proto),
+        # pylint: disable=protected-access
+        create_key=descriptor._internal_create_key)
+
+  def _ExtractSymbols(self, descriptors):
+    """Pulls out all the symbols from descriptor protos.
+
+    Args:
+      descriptors: The messages to extract descriptors from.
+    Yields:
+      A two element tuple of the type name and descriptor object.
+    """
+
+    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, dependencies, visited=None):
+    """Recursively finds dependencies for file protos.
+
+    Args:
+      dependencies: The names of the files being depended on.
+      visited: The names of files already found.
+
+    Yields:
+      Each direct and indirect dependency.
+    """
+
+    visited = visited or set()
+    for dependency in dependencies:
+      if dependency not in visited:
+        visited.add(dependency)
+        dep_desc = self.FindFileByName(dependency)
+        yield dep_desc
+        public_files = [d.name for d in dep_desc.public_dependencies]
+        yield from self._GetDeps(public_files, visited)
+
+  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: 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