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# Copyright (c) 2010 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.
import re
import sys
# A tool to add "#pragma once" lines to files that don't have it yet.
# Intended usage:
# find chrome -name '*.h' -exec python tools/pragmaonce/pragmaonce.py {} \;
# Some files have absurdly long comments at the top
NUM_LINES_TO_SCAN_FOR_GUARD = 250
def main(filename):
f = open(filename)
lines = f.readlines()
f.close()
index = -1
for i in xrange(min(NUM_LINES_TO_SCAN_FOR_GUARD, len(lines) - 1)):
m1 = re.match(r'^#ifndef ([A-Z_0-9]+)$', lines[i])
m2 = re.match(r'^#define ([A-Z_0-9]+)$', lines[i + 1])
if m1 and m2:
if m1.group(1) != m2.group(1):
print 'Skipping', filename, \
': Broken include guard (%s, %s)' % (m1.group(1), m2.group(1))
index = i + 2
break
if index == -1:
print 'Skipping', filename, ': no include guard found'
return
if index < len(lines) and re.match(r'#pragma once', lines[index]):
# The pragma is already there.
return
lines.insert(index, "#pragma once\n")
f = open(filename, 'w')
f.write(''.join(lines))
f.close()
if __name__ == '__main__':
if len(sys.argv) != 2:
print >>sys.stderr, "Usage: %s inputfile" % sys.argv[0]
sys.exit(1)
main(sys.argv[1])
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