Re: help with conceal

Fernando Basso wrote:
> I have a little syntax file, with lines like:
>
> highlight sExamplesInText ctermfg=yellow guifg=yellow
> syntax match sExamplesInText /«\zs[^»]\_.\{-}\ze»/
>
> I'd like to use « and » to delimit the text I want to be yellow, but
> also, to hide those delimiters.
>
> I tried:
>
> syntax match Conceal /«\|»/ conceal
>
> but that seems not to be the right thing (I did set conceallevel=2).
>
> So, text inside « and » characters should be yellow (or any other
> color). But the delimiter should be hidden. What is the way to go?
>
>
Please try:

syn clear
set cole=3
syn match DelimHide1 /«/ nextgroup=sExamplesInText conceal
syn match sExamplesInText /\_.\{-}\ze»/ contained
nextgroup=DelimHide2
syn match DelimHide2 /»/ contained conceal
hi sExamplesInText ctermfg=yellow guifg=yellow

You may find hilinks of help with your syntax work...

http://drchip.0sites.net/astronaut/vim/index.html#HILINKS

This plugin provides the :HLT! command -- with it you'll get a syntax
stack trace and a highlighting stack trace as you move your cursor about.

The problem you've had with your syntax highlighting is one with
priority and sequentiality:

* With the following sequence, the « has already been taken up

syntax match Conceal /«\|»/ conceal
syntax match sExamplesInText /«\zs[^»]\_.\{-}\ze»/

by the sExamplesInText, as it has priority due to appearing later (sequence), so "Conceal" never sees it (assuming balanced «...» delimiters so that sExamplesInText matches).

* With the following sequence, the « has already been taken up

syntax match sExamplesInText /«\zs[^»]\_.\{-}\ze»/
syntax match Conceal /«\|»/ conceal

by the "Conceal", as it has priority due to appearing later (sequence); this time, sExamplesInText never sees the character and so never matches.

HTH,
Chip Campbell

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