Ilya Bobir wrote:
> I've already posted about this bug in syntax matching code. But now I
> have a fix.
>
> Test case
> =========
> Having following syntax rules
>
> :syn cluster Top contains=Block,String,Identifier
> :syn region Block start=+{+ end=+}+ keepend extend [EMAIL PROTECTED]
> :syn region String start=+"+ end=+"+ contains=Identifier
> :syn region Identifier start=+\${+ end=+}+ extend
>
> and the following buffer is matched incorrectly
>
> { "string ${var} string" }
>
> on current vim version (7.0.109) I'm getting following syntax groups:
>
> { "string ${var} string" }
> BBBBBBBBBBBBBBBBBBBBBBBBBB
> SSSSSSSSSSSSSS SS
> IIIIII
>
> Where B means Block region, S - String region and I - Identifier region.
>
> While I'm expecting to see the following picture:
>
> { "string ${var} string" }
> BBBBBBBBBBBBBBBBBBBBBBBBBB
> SSSSSSSSSSSSSSSSSSSSSS
> IIIIII
>
> Bug description
> ===============
> Bug appears, when one have an extend region inside a normal region
> inside a keepend region. Currently, when any extend region ends vim
> checks all the outer keepend regions to see, if theirs ends should be
> "extended", but it does not checks intermediate normal (non keepend)
> regions and theirs ends should also be checked otherwise one could end
> up with a normal region been forcefully ended by enclosing keepend
> region and this keepend region later be extended by a containing extend
> region.
>
> Just as it is seen in the first picture in the test case. Block region
> ends String region on a first '}'. But later when Identifier region
> consumes that first '}' Block region is extended, while String region is
> not.
>
> Solution
> ========
> Test intermediate normal region ends along with keepend region ends when
> an extend region ends.
>
> Here is a patch for syntax.c that does this check. I'm getting correct
> behavior with this patch for my test case.
Complicated stuff. I'm glad you managed to find a solution. But we
need to check for side effects. I'll include it and try it out for a
while before sending out an official patch.
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