1 # Copyright 2014 The Chromium Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 6 def RegexCheck(re, line_number, line, regex, msg): 7 """Searches for |regex| in |line| to check for a particular style 8 violation, returning a message like the one below if the regex matches. 9 The |regex| must have exactly one capturing group so that the relevant 10 part of |line| can be highlighted. If more groups are needed, use 11 "(?:...)" to make a non-capturing group. Sample message: 12 13 line 6: Use var instead of const. 14 const foo = bar(); 15 ^^^^^ 16 """ 17 18 def _highlight(match): 19 """Takes a start position and a length, and produces a row of '^'s to 20 highlight the corresponding part of a string. 21 """ 22 return match.start(1) * ' ' + (match.end(1) - match.start(1)) * '^' 23 24 match = re.search(regex, line) 25 if match: 26 assert len(match.groups()) == 1 27 return ' line %d: %s\n%s\n%s' % (line_number, msg, line, _highlight(match)) 28 return '' 29
