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#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
A simple wrapper for protoc.
- Adds includes in generated headers.
- Handles building with system protobuf as an option.
"""
import optparse
import os.path
import shutil
import subprocess
import sys
import tempfile
PROTOC_INCLUDE_POINT = '// @@protoc_insertion_point(includes)\n'
def ModifyHeader(header_file, extra_header):
"""Adds |extra_header| to |header_file|. Returns 0 on success.
|extra_header| is the name of the header file to include.
|header_file| is a generated protobuf cpp header.
"""
include_point_found = False
header_contents = []
with open(header_file) as f:
for line in f:
header_contents.append(line)
if line == PROTOC_INCLUDE_POINT:
extra_header_msg = '#include "%s"\n' % extra_header
header_contents.append(extra_header_msg)
include_point_found = True;
if not include_point_found:
return 1
with open(header_file, 'wb') as f:
f.write(''.join(header_contents))
return 0
def RewriteProtoFilesForSystemProtobuf(path):
wrapper_dir = tempfile.mkdtemp()
try:
for filename in os.listdir(path):
if not filename.endswith('.proto'):
continue
with open(os.path.join(path, filename), 'r') as src_file:
with open(os.path.join(wrapper_dir, filename), 'w') as dst_file:
for line in src_file:
# Remove lines that break build with system protobuf.
# We cannot optimize for lite runtime, because system lite runtime
# does not have a Chromium-specific hack to retain unknown fields.
# Similarly, it does not understand corresponding option to control
# the usage of that hack.
if 'LITE_RUNTIME' in line or 'retain_unknown_fields' in line:
continue
dst_file.write(line)
return wrapper_dir
except:
shutil.rmtree(wrapper_dir)
raise
def main(argv):
parser = optparse.OptionParser()
parser.add_option('--include', dest='extra_header',
help='The extra header to include. This must be specified '
'along with --protobuf.')
parser.add_option('--protobuf', dest='generated_header',
help='The c++ protobuf header to add the extra header to. '
'This must be specified along with --include.')
parser.add_option('--proto-in-dir',
help='The directory containing .proto files.')
parser.add_option('--proto-in-file', help='Input file to compile.')
parser.add_option('--use-system-protobuf', type=int, default=0,
help='Option to use system-installed protobuf '
'instead of bundled one.')
(options, args) = parser.parse_args(sys.argv)
if len(args) < 2:
return 1
proto_path = options.proto_in_dir
if options.use_system_protobuf == 1:
proto_path = RewriteProtoFilesForSystemProtobuf(proto_path)
try:
# Run what is hopefully protoc.
protoc_args = args[1:]
protoc_args += ['--proto_path=%s' % proto_path,
os.path.join(proto_path, options.proto_in_file)]
ret = subprocess.call(protoc_args)
if ret != 0:
return ret
finally:
if options.use_system_protobuf == 1:
# Remove temporary directory holding re-written files.
shutil.rmtree(proto_path)
# protoc succeeded, check to see if the generated cpp header needs editing.
if not options.extra_header or not options.generated_header:
return 0
return ModifyHeader(options.generated_header, options.extra_header)
if __name__ == '__main__':
sys.exit(main(sys.argv))
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