пятница, 19 октября 2012 г., 13:32:19 UTC+4 пользователь Sektor van Skijlen
написал:
> Hello,
>
> I would like to use 'syntax region', where I have a defined start and
> possible end of region, BUT: after the pattern considered as start it may
> happen that there is a pattern that should cause the whole region match to be
> cancelled. It's not something like for 'skip' because it still makes the
> region to be matched.
>
> In other words: my region starts from found A letter and ends with Z letter,
> but can't contain Q letter, so:
>
> A T W Z E
>
> makes the region to be matched since the first letter to the last but one.
> But here:
>
> T A Q E Z
>
> despite matching start with A, there is no region to be matched in this
> sequence because he Q letter causes the matching to be cancelled.
>
> How to do something like that in vim syntax definition?
In vim regular
syntax match {group} /\vA[^Q]{-}Z/
can contain syntax elements just like ":syntax region" (and, I believe, but
have not tried, ":syn keyword"). So, in your example both the above will work.
With using "\_[^Q]" it will even work for multi-line matches (use
"\v%(%(Q)@!.){-}" if "Q" is actually a complex pattern). If you are using
":syntax region" because of nesting possibility you may try to use something
like "start=/\vA%(%(%(Z)@!\_.){-}Q\_.{-}Z)@!/". Both solutions imply
performance penalty, second one is more huge (while trying to test this on
nested if conditions I got "E363: pattern uses more memory than
'maxmempattern'", increasing it to 200000 has shown that it is working). Any
regex solution I can imagine won't disable the match in nested regions without
retreating to handling a number of specific cases:
("<" stands for "A", ">" for "Z" and "X" for "Q")
Text: < < < > > < < X > > >
Nesting level: 112233322111111111111
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