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#!/usr/bin/env python3
#
# litlint
#
# Ensure RUN commands in lit tests are free of common errors.
#
# If any errors are detected, litlint returns a nonzero exit code.
#
import optparse
import re
import sys
from io import open
# Compile regex once for all files
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).
"""
# Check that RUN command can be executed with an emulator
m = runRegex.search(s)
if m:
start, end = m.span()
return ('missing %run before %t', start + 2)
# No errors
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', encoding='utf-8') 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__":
# Parse args
parser = optparse.OptionParser()
parser.add_option('--filter') # ignored
(options, filenames) = parser.parse_args()
# Lint each file
errs = 0
for p in filenames:
errs += LintFile(p)
# If errors, return nonzero
if errs > 0:
sys.exit(1)
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