Subject: Re: [PATCH] Avoid false positives in label detection in cpp diff hunk header regex.

From: Johannes Sixt <[email-masked]>
Date: Fri, 22 Mar 2013 22:55:27 +0100

Am 22.03.2013 16:02, schrieb Junio C Hamano:
> Vadim Zeitlin <[email-masked]> writes:
> 
>> A C++ method start such as
>>
>>         void
>>         foo::bar()
>>
>> wasn't recognized by cpp diff driver as it mistakenly included "foo::bar" as a
>> label. However the colon in a label can't be followed by another colon, so
>> recognize this case specially to correctly detect C++ methods using this style.

Much appreciated!

>>  PATTERNS("cpp",
>>          /* Jump targets or access declarations */
>> -        "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:.*$\n"
>> +        "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:([^:].*$|$)\n"
> 
> Hmm.  Wouldn't "find a word (possibly after indentation), colon and
> then either a non-colon or end of line" be sufficient and simpler?
> iow, something like...
> 
>        "!^[ \t]*[A-Za-z_][A-Za-z_0-9]*:([^:]|$)"

Yes, indeed. We don't need to match more than necessary in a negative
pattern. The \n must still remain, though.

-- Hannes