import optparse
import re
import sys
runRegex = re.compile(r'(?<!-o)(?<!%run) %t\s')
def LintLine(s):
""" Validate a line
Args:
s: str, the line to validate
Returns:
Returns an error message and a 1-based column number if an error was
detected, otherwise (None, None).
"""
m = runRegex.search(s)
if m:
start, end = m.span()
return ('missing %run before %t', start + 2)
return (None, None)
def LintFile(p):
""" Check that each RUN command can be executed with an emulator
Args:
p: str, valid path to a file
Returns:
The number of errors detected.
"""
errs = 0
with open(p, 'r') as f:
for i, s in enumerate(f.readlines(), start=1):
msg, col = LintLine(s)
if msg != None:
errs += 1
errorMsg = 'litlint: {}:{}:{}: error: {}.\n{}{}\n'
arrow = (col-1) * ' ' + '^'
sys.stderr.write(errorMsg.format(p, i, col, msg, s, arrow))
return errs
if __name__ == "__main__":
parser = optparse.OptionParser()
parser.add_option('--filter') (options, filenames) = parser.parse_args()
errs = 0
for p in filenames:
errs += LintFile(p)
if errs > 0:
sys.exit(1)