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GameServerZ
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# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# 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
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Provides a container for DescriptorProtos."""

__author__ = '[email protected] (Matt Toia)'

import warnings


class Error(Exception):
  pass


class DescriptorDatabaseConflictingDefinitionError(Error):
  """Raised when a proto is added with the same name & different descriptor."""


class DescriptorDatabase(object):
  """A container accepting FileDescriptorProtos and maps DescriptorProtos."""

  def __init__(self):
    self._file_desc_protos_by_file = {}
    self._file_desc_protos_by_symbol = {}

  def Add(self, file_desc_proto):
    """Adds the FileDescriptorProto and its types to this database.



    Args:

      file_desc_proto: The FileDescriptorProto to add.

    Raises:

      DescriptorDatabaseConflictingDefinitionError: if an attempt is made to

        add a proto with the same name but different definition than an

        existing proto in the database.

    """
    proto_name = file_desc_proto.name
    if proto_name not in self._file_desc_protos_by_file:
      self._file_desc_protos_by_file[proto_name] = file_desc_proto
    elif self._file_desc_protos_by_file[proto_name] != file_desc_proto:
      raise DescriptorDatabaseConflictingDefinitionError(
          '%s already added, but with different descriptor.' % proto_name)
    else:
      return

    # Add all the top-level descriptors to the index.
    package = file_desc_proto.package
    for message in file_desc_proto.message_type:
      for name in _ExtractSymbols(message, package):
        self._AddSymbol(name, file_desc_proto)
    for enum in file_desc_proto.enum_type:
      self._AddSymbol(('.'.join((package, enum.name))), file_desc_proto)
      for enum_value in enum.value:
        self._file_desc_protos_by_symbol[
            '.'.join((package, enum_value.name))] = file_desc_proto
    for extension in file_desc_proto.extension:
      self._AddSymbol(('.'.join((package, extension.name))), file_desc_proto)
    for service in file_desc_proto.service:
      self._AddSymbol(('.'.join((package, service.name))), file_desc_proto)

  def FindFileByName(self, name):
    """Finds the file descriptor proto by file name.



    Typically the file name is a relative path ending to a .proto file. The

    proto with the given name will have to have been added to this database

    using the Add method or else an error will be raised.



    Args:

      name: The file name to find.



    Returns:

      The file descriptor proto matching the name.



    Raises:

      KeyError if no file by the given name was added.

    """

    return self._file_desc_protos_by_file[name]

  def FindFileContainingSymbol(self, symbol):
    """Finds the file descriptor proto containing the specified symbol.



    The symbol should be a fully qualified name including the file descriptor's

    package and any containing messages. Some examples:



    'some.package.name.Message'

    'some.package.name.Message.NestedEnum'

    'some.package.name.Message.some_field'



    The file descriptor proto containing the specified symbol must be added to

    this database using the Add method or else an error will be raised.



    Args:

      symbol: The fully qualified symbol name.



    Returns:

      The file descriptor proto containing the symbol.



    Raises:

      KeyError if no file contains the specified symbol.

    """
    try:
      return self._file_desc_protos_by_symbol[symbol]
    except KeyError:
      # Fields, enum values, and nested extensions are not in
      # _file_desc_protos_by_symbol. Try to find the top level
      # descriptor. Non-existent nested symbol under a valid top level
      # descriptor can also be found. The behavior is the same with
      # protobuf C++.
      top_level, _, _ = symbol.rpartition('.')
      try:
        return self._file_desc_protos_by_symbol[top_level]
      except KeyError:
        # Raise the original symbol as a KeyError for better diagnostics.
        raise KeyError(symbol)

  def FindFileContainingExtension(self, extendee_name, extension_number):
    # TODO(jieluo): implement this API.
    return None

  def FindAllExtensionNumbers(self, extendee_name):
    # TODO(jieluo): implement this API.
    return []

  def _AddSymbol(self, name, file_desc_proto):
    if name in self._file_desc_protos_by_symbol:
      warn_msg = ('Conflict register for file "' + file_desc_proto.name +
                  '": ' + name +
                  ' is already defined in file "' +
                  self._file_desc_protos_by_symbol[name].name + '"')
      warnings.warn(warn_msg, RuntimeWarning)
    self._file_desc_protos_by_symbol[name] = file_desc_proto


def _ExtractSymbols(desc_proto, package):
  """Pulls out all the symbols from a descriptor proto.



  Args:

    desc_proto: The proto to extract symbols from.

    package: The package containing the descriptor type.



  Yields:

    The fully qualified name found in the descriptor.

  """
  message_name = package + '.' + desc_proto.name if package else desc_proto.name
  yield message_name
  for nested_type in desc_proto.nested_type:
    for symbol in _ExtractSymbols(nested_type, message_name):
      yield symbol
  for enum_type in desc_proto.enum_type:
    yield '.'.join((message_name, enum_type.name))