| # Copyright 2014 The Chromium Authors |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| |
| def RegexCheck(re, line_number, line, regex, msg): |
| """Searches for |regex| in |line| to check for a particular style |
| violation, returning a message like the one below if the regex matches. |
| The |regex| must have exactly one capturing group so that the relevant |
| part of |line| can be highlighted. If more groups are needed, use |
| "(?:...)" to make a non-capturing group. Sample message: |
| |
| line 6: Use var instead of const. |
| const foo = bar(); |
| ^^^^^ |
| """ |
| |
| def _highlight(match): |
| """Takes a start position and a length, and produces a row of '^'s to |
| highlight the corresponding part of a string. |
| """ |
| return match.start(1) * ' ' + (match.end(1) - match.start(1)) * '^' |
| |
| match = re.search(regex, line) |
| if match: |
| assert len(match.groups()) == 1 |
| return ' line %d: %s\n%s\n%s' % (line_number, msg, line, _highlight(match)) |
| return '' |
