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#!/usr/bin/env python2.7
# Copyright 2016, Google Inc.
# All rights reserved.
#
# 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.
import argparse
import os
import os.path
import re
import sys
import subprocess
def build_valid_guard(fpath):
prefix = 'GRPC_' if not fpath.startswith('include/') else ''
return prefix + '_'.join(fpath.replace('++', 'XX').replace('.', '_').upper().split('/')[1:])
def load(fpath):
with open(fpath, 'r') as f:
return f.read()
def save(fpath, contents):
with open(fpath, 'w') as f:
f.write(contents)
class GuardValidator(object):
def __init__(self):
self.ifndef_re = re.compile(r'#ifndef ([A-Z][A-Z_1-9]*)')
self.define_re = re.compile(r'#define ([A-Z][A-Z_1-9]*)')
self.endif_c_re = re.compile(r'#endif /\* ([A-Z][A-Z_1-9]*) (?:\\ *\n *)?\*/')
self.endif_cpp_re = re.compile(r'#endif // ([A-Z][A-Z_1-9]*)')
self.failed = False
def fail(self, fpath, regexp, fcontents, match_txt, correct, fix):
cpp_header = 'grpc++' in fpath
self.failed = True
invalid_guards_msg_template = (
'{0}: Missing preprocessor guards (RE {1}). '
'Please wrap your code around the following guards:\n'
'#ifndef {2}\n'
'#define {2}\n'
'...\n'
'... epic code ...\n'
'...\n') + ('#endif // {2}' if cpp_header else '#endif /* {2} */')
if not match_txt:
print invalid_guards_msg_template.format(fpath, regexp.pattern,
build_valid_guard(fpath))
return fcontents
print ('{}: Wrong preprocessor guards (RE {}):'
'\n\tFound {}, expected {}').format(
fpath, regexp.pattern, match_txt, correct)
if fix:
print 'Fixing {}...\n'.format(fpath)
fixed_fcontents = re.sub(match_txt, correct, fcontents)
if fixed_fcontents:
self.failed = False
return fixed_fcontents
else:
print
return fcontents
def check(self, fpath, fix):
cpp_header = 'grpc++' in fpath
valid_guard = build_valid_guard(fpath)
fcontents = load(fpath)
match = self.ifndef_re.search(fcontents)
if not match:
print 'something drastically wrong with: %s' % fpath
return False # failed
if match.lastindex is None:
# No ifndef. Request manual addition with hints
self.fail(fpath, match.re, match.string, '', '', False)
return False # failed
# Does the guard end with a '_H'?
running_guard = match.group(1)
if not running_guard.endswith('_H'):
fcontents = self.fail(fpath, match.re, match.string, match.group(1),
valid_guard, fix)
if fix: save(fpath, fcontents)
# Is it the expected one based on the file path?
if running_guard != valid_guard:
fcontents = self.fail(fpath, match.re, match.string, match.group(1),
valid_guard, fix)
if fix: save(fpath, fcontents)
# Is there a #define? Is it the same as the #ifndef one?
match = self.define_re.search(fcontents)
if match.lastindex is None:
# No define. Request manual addition with hints
self.fail(fpath, match.re, match.string, '', '', False)
return False # failed
# Is the #define guard the same as the #ifndef guard?
if match.group(1) != running_guard:
fcontents = self.fail(fpath, match.re, match.string, match.group(1),
valid_guard, fix)
if fix: save(fpath, fcontents)
# Is there a properly commented #endif?
endif_re = self.endif_cpp_re if cpp_header else self.endif_c_re
flines = fcontents.rstrip().splitlines()
match = endif_re.search('\n'.join(flines[-2:]))
if not match:
# No endif. Check if we have the last line as just '#endif' and if so
# replace it with a properly commented one.
if flines[-1] == '#endif':
flines[-1] = ('#endif' +
(' // {}\n'.format(valid_guard) if cpp_header
else ' /* {} */\n'.format(valid_guard)))
if fix:
fcontents = '\n'.join(flines)
save(fpath, fcontents)
else:
# something else is wrong, bail out
self.fail(fpath, endif_re, flines[-1], '', '', False)
elif match.group(1) != running_guard:
# Is the #endif guard the same as the #ifndef and #define guards?
fcontents = self.fail(fpath, endif_re, fcontents, match.group(1),
valid_guard, fix)
if fix: save(fpath, fcontents)
return not self.failed # Did the check succeed? (ie, not failed)
# find our home
ROOT = os.path.abspath(
os.path.join(os.path.dirname(sys.argv[0]), '../..'))
os.chdir(ROOT)
# parse command line
argp = argparse.ArgumentParser(description='include guard checker')
argp.add_argument('-f', '--fix',
default=False,
action='store_true');
argp.add_argument('--precommit',
default=False,
action='store_true')
args = argp.parse_args()
KNOWN_BAD = set([
'src/core/ext/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.h',
'include/grpc++/ext/reflection.grpc.pb.h',
'include/grpc++/ext/reflection.pb.h',
])
grep_filter = r"grep -E '^(include|src/core)/.*\.h$'"
if args.precommit:
git_command = 'git diff --name-only HEAD'
else:
git_command = 'git ls-tree -r --name-only -r HEAD'
FILE_LIST_COMMAND = ' | '.join((git_command, grep_filter))
# scan files
ok = True
filename_list = []
try:
filename_list = subprocess.check_output(FILE_LIST_COMMAND,
shell=True).splitlines()
# Filter out non-existent files (ie, file removed or renamed)
filename_list = (f for f in filename_list if os.path.isfile(f))
except subprocess.CalledProcessError:
sys.exit(0)
validator = GuardValidator()
for filename in filename_list:
if filename in KNOWN_BAD: continue
ok = ok and validator.check(filename, args.fix)
sys.exit(0 if ok else 1)
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