Re: Syntax highlight problems

2015-04-07 17:51 GMT+03:00 Alessandro Antonello <antonello.ale@gmail.com>:
> Hi everyone.
>
> I think I'm a little bit rusty using regular expressions in syntax
> highlight.
> I was trying to add a custom highlight to a Doxygen comment body and, for
> some
> reason, it is leaking to outside the comment limits.
>
> In the file 'after/syntax/doxygen.vim' I did the following:
>
> syn match doxygenCustomUnderline contained /[^}]*/
> \ containedin=doxygenUnderlineMatch
> syn region doxygenUnderlineMatch transparent contained
> \ start=/\%(\%(\\\|@\)uf\){/ms=s+4 end=/}/ keepend
> \ contains=doxygenCustomUnderline containedin=doxygenBody,doxygenBrief
>
> hi def link doxygenCustomUnderline Underlined

Your regex is rather strange:

1. You don't need outer \%(\) at all.
2. You don't need inner \%(\) as well because what you have there is
naturally expressed as the collection.

In any case, with

hi def link doxygenCustomUnderline Underlined
set ft=cpp.doxygen
syn match doxygenCustomUnderline contained /[^}]*/
containedin=doxygenUnderlineMatch
syn region doxygenUnderlineMatch transparent contained
start=/[@\\]uf{/ms=s+4 end=/}/ keepend
containedin=doxygenBody,doxygenBrief contains=doxygenCustomUnderline

I don't have the behaviour you observe. Vim version is 7.4.683.

Specifically I have `\uf{underlined}` underlined where expected, but
not `@uf{underlined too}`. `(int argc… {<Space>` *are* underlined.

My special ShowSyntax command (shows synstack output at cursor
position) shows that if there is `containedin=doxygenUnderlineMatch`
there is no doxygenUnderlineMatch at that position, but there is
doxygenCustomUnderline.

Worse, it seems to depend on some state: I see this behaviour *only in
first attempt in the first unnamed buffer that is there when Vim
starts*.

If I do <C-w>v:enew<CR> (including without `<C-w>v`) and repeat those
commands `(int…` is not underlined.

If I do `set ft=cpp.doxygen` in the very same buffer `(int…` is no
longer highlighted.

Also note that `(int` is highlighted immediately I define `syn
match…`. It is also highlighted if I rename groups to `dcu` and `dum`.

Not sure what is this exactly, but this is definitely some strange bug.

>
> NOTE: In the original file there are no continuation lines. Each group is
> wrote in a single line. I use continuation line here to ease reading.
>
> The I made the test in a 'syntest.cpp' file:
>
> /**
> * Brief description \uf{underlined}.
> * With body @uf{underlined too}.
> */
> int main(int argc, char** argv) { }
> --------------------------
>
> Surprisingly the underlined text is marked with '--' in addition to both
> regions in the doxygen comment. What could cause this kind of leak? I can't
> understand since the group 'doxygenCustomUnderline' is specifically set as
> contained in the group 'doxygenUnderlineMatch'.
>
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