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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 '' | |
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