You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
138 lines
4.9 KiB
Python
138 lines
4.9 KiB
Python
# Protocol Buffers - Google's data interchange format
|
|
# Copyright 2008 Google Inc. All rights reserved.
|
|
# http://code.google.com/p/protobuf/
|
|
#
|
|
# 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__ = 'matthewtoia@google.com (Matt Toia)'
|
|
|
|
|
|
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:
|
|
DescriptorDatabaseException: if an attempt is made to add a proto
|
|
with the same name but different definition than an exisiting
|
|
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)
|
|
|
|
package = file_desc_proto.package
|
|
for message in file_desc_proto.message_type:
|
|
self._file_desc_protos_by_symbol.update(
|
|
(name, file_desc_proto) for name in _ExtractSymbols(message, package))
|
|
for enum in file_desc_proto.enum_type:
|
|
self._file_desc_protos_by_symbol[
|
|
'.'.join((package, enum.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'
|
|
|
|
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.
|
|
"""
|
|
|
|
return self._file_desc_protos_by_symbol[symbol]
|
|
|
|
|
|
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 = '.'.join((package, 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))
|