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#!/usr/bin/env python3
# Copyright (c) 2009 Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""A super simple linter to check C syntax."""
import argparse
import sys
warned = False
def warn(path, line, lineno, msg):
global warned
warned = True
print(f"{path}:{lineno}: {msg}", file=sys.stderr)
def check_line(path, line, idx, lines):
s = line
lineno = idx + 1
eof = lineno == len(lines)
if s.endswith(' \n'):
warn(path, line, lineno, "extra space at EOL")
elif '\t' in line:
warn(path, line, lineno, "line has a tab")
elif s.endswith('\r\n'):
warn(path, line, lineno, "Windows line ending")
# end of global block, e.g. "}newfunction...":
elif s == "}\n":
if not eof:
nextline = lines[idx + 1]
# "#" is a pre-processor line
if (
nextline != '\n'
and nextline.strip()[0] != '#'
and nextline.strip()[:2] != '*/'
):
warn(path, line, lineno, "expected 1 blank line")
sls = s.lstrip()
if sls.startswith('//') and sls[2] != ' ' and line.strip() != '//':
warn(path, line, lineno, "no space after // comment")
# e.g. "if(..." after keywords
keywords = ("if", "else", "while", "do", "enum", "for")
for kw in keywords:
if sls.startswith(kw + '('):
warn(path, line, lineno, f"missing space between {kw!r} and '('")
# eof
if eof and not line.endswith('\n'):
warn(path, line, lineno, "no blank line at EOF")
ss = s.strip()
if ss.startswith(("printf(", "printf (")):
if not ss.endswith(("// NOQA", "// NOQA")):
warn(path, line, lineno, "printf() statement")
def process(path):
with open(path) as f:
lines = f.readlines()
for idx, line in enumerate(lines):
check_line(path, line, idx, lines)
def main():
parser = argparse.ArgumentParser()
parser.add_argument('paths', nargs='+', help='path(s) to a file(s)')
args = parser.parse_args()
for path in args.paths:
process(path)
if warned:
sys.exit(1)
if __name__ == '__main__':
main()
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