I use the standard C syntax rules, but I have added a couple of rules
in my after/syntax/c.vim file to add some additional syntax folding. I
have narrowed my problem down to the following addition:
" add folding of multiline () groups
syn region SynFoldParen
\ start="(" end=")"
\ skip=+"\%(\\"\|[^"]\)\{-}\\\@<!"\|'[^']\{-}'\|'\\''\|//.*+
\ transparent fold keepend extend
\ containedin=ALLBUT,cComment,cCommentL,cString,cCppString
Using this addition, with this code::
void foo()
{
printf("look how {braces} break highlighting!\n");
}
makes the "Constant" highlighting go away after the closing brace
('}') in the printf statement.
Without the additional fold rule, the highlighting is fine.
I have the following mapping to display the current syntax stack:
nmap <F10>
\ :echo '<'.synIDattr(synIDtrans(synID(line('.'),col('.'),
1)),'name').'> from:' <bar>
\ let indent = '' <bar>
\ for syn_id in synstack(line('.'), col('.')) <bar>
\ echo indent.'<'.synIDattr(syn_id,"name").'>' <bar>
\ let indent .= ' ' <bar>
\ endfor <bar>
\ unlet indent<CR>
Using this command, I get for the syntax stack, between the opening
double-quote and the closing brace:
<Constant> from:
<cBlock>
<SynFoldParen>
<cParen>
<cString>
After the closing brace until the end quote, I get:
<> from:
<cBlock>
<SynFoldParen>
<cParen>
<cString>
Even the \n gets the correct "cSpecial" highlight group:
<> from:
<cBlock>
<SynFoldParen>
<cParen>
<cString>
<cSpecial>
Everything seems correct in these last two syntax stacks, except that
highlight group that is linked to the final item in the syntax stack
does not get applied. I'm completely baffled as to why.
I thought at first that maybe the cBlock group from the function body
was ending prematurely, but this is not the case, as I can see from
the fold column (since cBlock is folded).
Syntax stacks for the places above using just the standard rules are
identical, except for the fact that SynFoldParen is missing, and the
correct linked highlight group is applied.
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