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# Copyright 2015 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.
# Runs the Microsoft Message Compiler (mc.exe). This Python adapter is for the
# GN build, which can only run Python and not native binaries.
#
# Usage: message_compiler.py <environment_file> [<args to mc.exe>*]
import os
import subprocess
import sys
def main():
# Read the environment block from the file. This is stored in the format used
# by CreateProcess. Drop last 2 NULs, one for list terminator, one for
# trailing vs. separator.
env_pairs = open(sys.argv[1]).read()[:-2].split('\0')
env_dict = dict([item.split('=', 1) for item in env_pairs])
# mc writes to stderr, so this explicitly redirects to stdout and eats it.
try:
# This needs shell=True to search the path in env_dict for the mc
# executable.
rest = sys.argv[2:]
subprocess.check_output(['mc.exe'] + rest,
env=env_dict,
stderr=subprocess.STDOUT,
shell=True)
# We require all source code (in particular, the header generated here) to
# be UTF-8. jinja can output the intermediate .mc file in UTF-8 or UTF-16LE.
# However, mc.exe only supports Unicode via the -u flag, and it assumes when
# that is specified that the input is UTF-16LE (and errors out on UTF-8
# files, assuming they're ANSI). Even with -u specified and UTF16-LE input,
# it generates an ANSI header, and includes broken versions of the message
# text in the comment before the value. To work around this, for any invalid
# // comment lines, we simply drop the line in the header after building it.
header_dir = None
input_file = None
for i, arg in enumerate(rest):
if arg == '-h' and len(rest) > i + 1:
assert header_dir == None
header_dir = rest[i + 1]
elif arg.endswith('.mc') or arg.endswith('.man'):
assert input_file == None
input_file = arg
if header_dir:
header_file = os.path.join(
header_dir, os.path.splitext(os.path.basename(input_file))[0] + '.h')
header_contents = []
with open(header_file, 'rb') as f:
for line in f.readlines():
if line.startswith('//') and '?' in line:
continue
header_contents.append(line)
with open(header_file, 'wb') as f:
f.write(''.join(header_contents))
except subprocess.CalledProcessError as e:
print e.output
sys.exit(e.returncode)
if __name__ == '__main__':
main()
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