Hi Neil,
I think I found the cause of this issue:
http://code.google.com/p/vim/issues/detail?id=239
2014/7/19 Sat 0:29:29 UTC+9 [email protected]:
> Status: New
> Owner: ----
> Labels: Type-Defect Priority-Medium
>
> New issue 239 by [email protected]: Python file with large numbers stalls
> the editor
> http://code.google.com/p/vim/issues/detail?id=239
>
> What steps will reproduce the problem?
>
> 1. Open a new document
> 2. :set filetype=python
> 3. type a huge number (like
7853478453785437895437895347895789534798354879534789534798543789345789543789543789543789543798543789345879543789453789543978453789453897543789453798354789345798345789354789543789534897543879345789345789534789543789534978345789453789534789543789543798543789543789543789534789543789354789574389574389574389574389754398754389574389754389754378954379854378954937854378543785439785437985493785437895437894537895439875438974537895437985437984539785497845389745378954378945387945378954378953497853478945378953489753478954397854378954397854378953489753478954397853489754389778543879354798534798354798354789534)
>
> Notice that vim will get slower and slower the longer the number gets.
>
> Seen on MacVim 7.4.258. No additional python plugin apart from what's built
> in.
>
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The slowness is caused by \@<=. Using \zs instead of \@<= seems to fix this.
Please check the attached patch.
Regards,
Ken Takata
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# HG changeset patch
# Parent aceade2553bea8c3ba3b65e1cebdc8a43c9fe7fd
diff --git a/runtime/syntax/python.vim b/runtime/syntax/python.vim
--- a/runtime/syntax/python.vim
+++ b/runtime/syntax/python.vim
@@ -160,7 +160,7 @@ if !exists("python_no_number_highlight")
syn match pythonNumber
\ "\<\d\+\.\%([eE][+-]\=\d\+\)\=[jJ]\=\%(\W\|$\)\@="
syn match pythonNumber
- \ "\%(^\|\W\)\@<=\d*\.\d\+\%([eE][+-]\=\d\+\)\=[jJ]\=\>"
+ \ "\%(^\|\W\)\zs\d*\.\d\+\%([eE][+-]\=\d\+\)\=[jJ]\=\>"
endif
" Group the built-ins in the order in the 'Python Library Reference' for
