2015-05-22 11:45 GMT+03:00 Dominique Pellé <dominique.pe...@gmail.com>:
> Christian Wellenbrock <christian.wellenbr...@gmail.com> wrote:
>
>> I attached a yaml file as example. Please open it with vim to test
>> the highlighting speed. Scolling and searching is very slow.
>> Tested on vim 7.3.1106
>
> Viewing your attached yaml file seems fast for me with vim-7.4.729,
> both with 'set re=0' or 'set re=1'.
I have relatively recently send an update. If you see help for :h
b:yaml_schema then you have this update because I also added support
for different schemas then.
It also contained a number of fixes to the regexes: most notable is
that some regexes no longer care about non-printable characters (YAML
definition explicitly disallows them in a number of places and my
highlighting was as close to YAML definition as possible, so you got a
regex `\%([\n\r\uFEFF \t]\@!\p\)` used in *loads* of places and that
was very slow).
>
> Anyway, looking at vim/runtime/syntax/yaml.vim, I see
> several [0-9] in regexp which could be replaced by \d
>
> This is what :help regexp says:
>
> === BEGIN QUOTE ===
> - Matching with a collection can be slow, because each character in
> the text has to be compared with each character in the collection.
> Use one of the other atoms above when possible. Example: "\d" is
> much faster than "[0-9]" and matches the same characters.
> === END QUOTE ===
>
> But I wonder whether this piece of advice is still true.
> In regexp_nfa.c, I see this comment:
>
> 1525 /*
> 1526 * Try to reverse engineer character classes. For
> example,
> 1527 * recognize that [0-9] stands for \d and [A-Za-z_] for
> \h,
> 1528 * and perform the necessary substitutions in the NFA.
> 1529 */
>
> So probably [0-9] is as efficient now than \d at least with the new
> NFA regexp engine.
>
> With 'set re=0', syntime report says:
>
> TOTAL COUNT MATCH SLOWEST AVERAGE NAME PATTERN
> 0.173880 349 0 0.001465 0.000498 yamlFloat
> [^[\]{}, \t]\@1<!\%([+-]\=\%(\%(\d[0-
> 0.043657 349 0 0.000798 0.000125 yamlInteger
> [^[\]{}, \t]\@1<!\%([+-]\=\%(0\%(b[0-
> 0.007699 621 602 0.000065 0.000012 yamlPlainScalar
> \%([^\-?:,[\]{}#&*!|>'"%@`\n\r\uFEFF
> 0.004388 621 367 0.000073 0.000007 yamlBlockMappingKey
> \%#=1^\s*\zs\%([^\-?:,[\]{}#&*!|>'"%@
>
> 0.004233 386 0 0.000078 0.000011
> yamlBlockCollectionItemStart ^\s*\zs-\%(\s\+-\)*\s
> 0.003241 386 0 0.000043 0.000008 yamlComment
> \%\(^\|\s\)#
> 0.003233 349 0 0.000045 0.000009 yamlNull
> [^[\]{}, \t]\@1<!\~[^[\]{}, \t]\@!
> 0.002419 386 0 0.000080 0.000006
> yamlBlockMappingMerge ^\s*\zs<<\ze:\%(\s\|$\)
> 0.000917 347 347 0.000013 0.000003 yamlKeyValueDelimiter \s*:
> 0.000465 347 347 0.000005 0.000001 yamlKeyValueDelimiter \s*:
> 0.000312 386 0 0.000007 0.000001 yamlDocumentEnd
> ^\.\.\.\ze\%(\s\|$\)
> 0.000193 386 0 0.000002 0.000001 yamlMappingKeyStart ?\ze\s
> 0.000166 386 0 0.000002 0.000000 yamlFlowCollection \[
> 0.000145 386 0 0.000003 0.000000 yamlDocumentStart
> ^---\ze\%(\s\|$\)
> 0.000138 386 0 0.000001 0.000000 yamlDirective
> ^\ze%[^\n\r\uFEFF \t]\+\s\+
> 0.000138 386 0 0.000001 0.000000 yamlAnchor
> &[^\n\r\uFEFF \t,[\]{}]\+
> 0.000135 386 0 0.000001 0.000000 yamlFlowMapping {
> 0.000135 386 0 0.000001 0.000000 yamlAlias
> \*[^\n\r\uFEFF \t,[\]{}]\+
> 0.000129 386 0 0.000002 0.000000 yamlFlowString '
> 0.000123 386 0 0.000002 0.000000 yamlFlowString "
> 0.000115 386 0 0.000003 0.000000 yamlNodeTag
> !<\%(%\x\x\|[[:alnum:]_\-]\|[#/;?:@&=
>
> Regards
> Dominique
>
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