15f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)# Copyright 2014 The Chromium Authors. All rights reserved. 25f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)# Use of this source code is governed by a BSD-style license that can be 35f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)# found in the LICENSE file. 45f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 55f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 65f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)def RegexCheck(re, line_number, line, regex, msg): 75f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) """Searches for |regex| in |line| to check for a particular style 85f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) violation, returning a message like the one below if the regex matches. 95f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) The |regex| must have exactly one capturing group so that the relevant 105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) part of |line| can be highlighted. If more groups are needed, use 115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) "(?:...)" to make a non-capturing group. Sample message: 125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) line 6: Use var instead of const. 145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const foo = bar(); 155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ^^^^^ 165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) """ 175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) def _highlight(match): 195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) """Takes a start position and a length, and produces a row of '^'s to 205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) highlight the corresponding part of a string. 215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) """ 225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return match.start(1) * ' ' + (match.end(1) - match.start(1)) * '^' 235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) match = re.search(regex, line) 255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if match: 265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) assert len(match.groups()) == 1 275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return ' line %d: %s\n%s\n%s' % (line_number, msg, line, _highlight(match)) 285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return '' 29