Re: Is is vim's bug of syntax and fold?

Ben Fritz wrote:
>
> On Feb 27, 4:45 am, Yichao Zhou<broken.z...@gmail.com> wrote:
>
>> 3. syn region vimBug1 start="{" end="}"
>> 4. syn region vimBig2 start="\\begin{homework}" end="\\end{homework}"
>> transparent fold
>>
>>
> This fails because the end of your vimBug1 group matches the last
> character of end{homework}, preventing the end of the vimBig2 group
> from matching at that location. By default, only one pattern can match
> at a specific spot, which allows nesting.
>
> To fix this, you'll need to use the "keepend" keyword. :help :syn-
> keepend.
>
> Note that this will make you unable to nest vimBig2 groups, so you
> will probably also need to look at :help :syn-extend and make
> modifications elsewhere in the syntax file.
>
>
Well, Ben, you beat me to it!

Yichao Zhou: may I suggest that you try my hilinks.vim plugin
(http://drchip.0sites.net/astronaut/vim/index.html#HILINKS). Issue
:HLT! with it, and as you move your cursor about, a report on the bottom
will (succinctly) show you the syntax and highlighting linkages.

In the example you gave:

\begin{homework}
111112222222222

where 1=vimBig2
and 2=vimBig2->vimBug1

Furthermore, the reason why vimBug1 shows up is due to your use of the
"transparent" keyword with vimBig2. Take transparent out, and you get
the folding you want.

Regards,
Chip Campbell

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