#!/usr/bin/env python3
helpdoc = """
A simple utility that verifies the syntax for python scripts.
The checks it does are :
* Check for 'tab' characters in .py files
* Compile errors in py sources
Usage:
python syntax_checker.py <python_source_file> [<python_source_file> ..]
"""
import sys
import os
import re
tabs_search_rex = re.compile(r"^\s*\t+",re.MULTILINE|re.DOTALL)
def find_non_ascii(s):
for c in s:
if ord(c) >= 0x80: return True
return False
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Error: Unknown arguments", file=sys.stderr)
print(helpdoc)
sys.exit(1)
for fname in sys.argv[1:]:
if not os.path.exists(fname):
print("Error: Cannot recognize %s as a file" % fname, file=sys.stderr)
sys.exit(1)
if fname.split('.')[-1] != 'py':
print("Note: %s is not a valid python file. Skipping." % fname)
continue
fh = open(fname)
strdata = fh.readlines()
lineno = 0
syntax_fail = False
for linedata in strdata:
lineno += 1
if len(tabs_search_rex.findall(linedata)) > 0 :
print("Error: Found a TAB character at %s:%d" % (fname, lineno), file=sys.stderr)
syntax_fail = True
if find_non_ascii(linedata):
print("Error: Found a non ascii character at %s:%d" % (fname, lineno), file=sys.stderr)
syntax_fail = True
if syntax_fail:
print("Error: Syntax check failed. Please fix the errors and try again.", file=sys.stderr)
sys.exit(1)
#now check for error in compilation
try:
with open(fname, 'r') as file:
source = file.read() + '\n'
compile_result = compile(source, fname, 'exec')
except Exception as exc:
print(str(exc), file=sys.stderr)
print("Error: Compilation failed. Please fix the errors and try again.", file=sys.stderr)
sys.exit(1)
print("Success: Checked %s. No syntax errors found." % fname)
sys.exit(0)