> I'm trying to write my own syntax file for a language where there are
> a lot of groups of the form
>
> :syn match langSomeGrp /^\s*KeyWord.*/
>
> The problem is that there are also end-of-line comments
> :syn match langComment /--.*/
>
> which can either stand on a line of its own OR be contained in a
> group like the above. How do I express that? Is it OK to have a
> contains=grpB in the declaration of a match grpA without a
> containedin=grpA in the declaration of match grpB?
Yes. "contains=X" and "containedin=Y" are two ways to declare the same thing:
a group is contained in another one. So
syn match Foo /whatever/ contains=Bar
syn match Bar /xyz/
and
syn match Foo /whatever/
syn match Bar /xyz/ containedin=Foo
are equivalent. You still have to add "contained" to Bar in both cases if
necessary, but since your comment can be on a line of its own it is not always
contained.
Best,
Paul
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