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Re: [Nano-devel] disable a time-consuming multiline regex?

From: Eitan Adler
Subject: Re: [Nano-devel] disable a time-consuming multiline regex?
Date: Wed, 23 Dec 2015 22:11:34 -0800

On 23 December 2015 at 09:38, Mike Frysinger <address@hidden> wrote:
> On 01 Dec 2015 21:14, Benno Schulenberg wrote:
>> The following regex in c.nanorc is very time-hungry:
>>   # Multiline strings.  This regex is VERY resource intensive!
>>   color brightyellow start=""(\\.|[^"])*\\[[:space:]]*$" end="^(\\.|[^"])*""
>> For example, run 'src/nano --cons +4444 src/winio.c',
>> then press and hold ^Y.  See how the flying by of the
>> pages is fairly smooth.
>> Then exit nano and run the same command again, and
>> type ^Y ^K.  Then press and hold ^Y.  See how after
>> a few seconds the scrolling begins to stutter and
>> pause (at least here it does, on a 1.6 GHz Atom).
>> Maybe that string should be commented out by default?
>> (When I do so, scrolling becomes fluid.)
>> Also, the regex doesn't work fully correctly.
>> For example, run 'src/nano imperfect.c' and type:
>> "one
>> two
>> three"
>> The string isn't coloured, which is correct, because backslashes
>> are missing.  Now type a backslah after "one" -- all three words
>> are coloured.  But that should happen only when there is also a
>> backslash after "two".  Nano's regexes are not capable of expressing
>> this, so maybe also therefore such an imperfect matcher should be
>> disabled?
> i tend to disable it as well because it gets other cases wrong like:
> #define FOO() \
>     printf("ok!"); \
>     blah; \
>     printf("done!");
> it causes the whole body of the macro to be highlighted
> -mike

+1 please disable it or remove it.

Eitan Adler

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