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#!/usr/bin/env python
"""
Checker for repeated tokens
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Helper script to find suspicious lexers which produce the same token
repeatedly, i.e. for example:
.. code::
'd' Text
'a' Text
't' Text
'a' Text
'b' Text
'a' Text
's' Text
'e' Text
This script has two test modes: Check for tokens repeating more often than
a given threshold, and exclude anything but single-character tokens.
Repeated single-character tokens are quite problematic as they result in
bloated output and are usually an indication that someone is missing
a + or * in the regex.
:copyright: Copyright 2006-2022 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
import argparse
import sys
from utility import unpack_output_file, process_output_files
def check_file(path, threshold, single_only):
current_token = ''
current_token_repeat_count = 1
for value, token, linenumber in unpack_output_file(path):
if single_only and len(value) > 1:
token = ''
current_token_repeat_count = 1
continue
if token != current_token:
current_token = token
current_token_repeat_count = 1
else:
current_token_repeat_count += 1
if current_token_repeat_count > threshold:
print(f'{path}:{linenumber}')
return False
return True
def main(args):
def check_file_callback(path):
return check_file(path, args.threshold, args.single)
if process_output_files(args.TEST_ROOT, check_file_callback) > 0:
return 1
return 0
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('TEST_ROOT',
help='Root directory containing the tests')
parser.add_argument('-t', '--threshold', type=int, default=5,
help='Warn if a token repeats itself more often then '
'this number.')
parser.add_argument('-s', '--single', action='store_true', default=False,
help='Only look at tokens matching a single character')
args = parser.parse_args()
sys.exit(main(args))
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