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#!/usr/bin/python
# Copyright (c) 2009 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.
# usage: rule_bison.py INPUT_FILE OUTPUT_DIR
# INPUT_FILE is a path to either CSSGrammar.y or XPathGrammar.y.
# OUTPUT_DIR is where the bison-generated .cpp and .h files should be placed.
import errno
import os
import os.path
import subprocess
import sys
assert len(sys.argv) == 3
input_file = sys.argv[1]
output_dir = sys.argv[2]
input_name = os.path.basename(input_file)
assert input_name == 'CSSGrammar.y' or input_name == 'XPathGrammar.y'
prefix = {'CSSGrammar.y': 'cssyy', 'XPathGrammar.y': 'xpathyy'}[input_name]
(input_root, input_ext) = os.path.splitext(input_name)
# The generated .h will be in a different location depending on the bison
# version.
output_h_tries = [
os.path.join(output_dir, input_root + '.cpp.h'),
os.path.join(output_dir, input_root + '.hpp'),
]
for output_h_try in output_h_tries:
try:
os.unlink(output_h_try)
except OSError, e:
if e.errno != errno.ENOENT:
raise
output_cpp = os.path.join(output_dir, input_root + '.cpp')
return_code = subprocess.call(['bison', '-d', '-p', prefix, input_file,
'-o', output_cpp])
assert return_code == 0
# Find the name that bison used for the generated header file.
output_h_tmp = None
for output_h_try in output_h_tries:
try:
os.stat(output_h_try)
output_h_tmp = output_h_try
break
except OSError, e:
if e.errno != errno.ENOENT:
raise
assert output_h_tmp != None
# Read the header file in under the generated name and remove it.
output_h_file = open(output_h_tmp)
output_h_contents = output_h_file.read()
output_h_file.close()
os.unlink(output_h_tmp)
# Rewrite the generated header with #include guards.
output_h = os.path.join(output_dir, input_root + '.h')
output_h_file = open(output_h, 'w')
print >>output_h_file, '#ifndef %s_h' % input_root
print >>output_h_file, '#define %s_h' % input_root
print >>output_h_file, output_h_contents
print >>output_h_file, '#endif'
output_h_file.close()
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