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vim-patch:7.4.497 #2295

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Problem:    With some regexp patterns the NFA engine uses many states and
            becomes very slow.  To the user it looks like Vim freezes.
Solution:   When the number of states reaches a limit fall back to the old
            engine. (Christian Brabandt)

https://github.com/vim/vim/releases/tag/v7-4-497

Helped-by: David Bürgin <676c7473@gmail.com>
Helped-by: Justin M. Keyes <justinkz@gmail.com>
Helped-by: Scott Prager <splinterofchaos@gmail.com>
This commit is contained in:
David Bürgin
2015-03-28 22:28:37 +01:00
committed by Justin M. Keyes
parent a69e464f70
commit d3bb177f1e
10 changed files with 239 additions and 73 deletions
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4
runtime/doc/options.txt
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@@ -5383,6 +5383,10 @@ A jump table for the options with a short description can be found at |Q_op|.
Note that when using the NFA engine and the pattern contains something
that is not supported the pattern will not match. This is only useful
for debugging the regexp engine.
Using automatic selection enables Vim to switch the engine, if the
default engine becomes too costly. E.g., when the NFA engine uses too
many states. This should prevent Vim from hanging on a combination of
a complex pattern with long text.
*'relativenumber'* *'rnu'* *'norelativenumber'* *'nornu'*
'relativenumber' 'rnu' boolean (default off)