Re: [Suggestion] New functions iskeywordchar(), isfnamechar(), isprintchar(), and isidentchar()

Am 07.11.2011 15:08, schrieb Axel Bender:
> @Andy
>
> Thanks for the answer!
>
> The split on '\zs' was new to me. Made some speed tests and found
> that for lines with more than 180 chars the first solution is faster,
> and for shorter lines the solution below, which is based on the
> split() approach. Opted for the new solution as short lines are much
> more common.
>
> function! CWord(string, class_start, class_end)
>> let l:chars = split(a:string, '\zs')
>> let l:len = len(l:chars)
>> let l:pos = virtcol(".") - 1

Using virtcol() looks wrong

>> let l:start = l:pos
>> while l:start>= 0&& l:chars[l:start] =~ a:class_start
>> let l:start -= 1
>> endwhile
>>
>> let l:end = l:pos
>> while l:end< l:len&& l:chars[l:end] =~ a:class_end
>> let l:end += 1
>> endwhile
>>
>> return join(l:chars[l:start + 1:l:end - 1], '')
>> endfunction

A few more hints ...

Are you aware of
:echo expand("<cword>")
:echo expand("<cWORD>")

:h expand()

If you just expect 'iskeyword' characters for the identifier (or
whatever you try to match), then

:echo expand("<cword>")

will do.
You can distinguish between possible start and end characters:

:echo matchstr(expand("<cword>"), '\h\w*')

(not perfect, but will do in *most* cases)
Or use a custom 'isk' setting, just for the matching:

func! CWord1(custom_isk)
let sav_isk = &isk
let &l:isk = a:custom_isk
let word = expand("<cword>")
let &l:isk = sav_isk
return word
endfunc

Just a few hints ...

I'd never loop over characters in Vimscript if possible.

--
Andy

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