Re: Am I looking at a comment?

On Thu, 2009-10-01 at 14:13 +0300, Hannu Koivisto wrote:
> "Eric M. Ludlam" <eric <at> siege-engine.com> writes:
> 
> > To know your current context, you need a good start location, then you
> > need to parse from there to point and see where you are.  Semantic uses
> > Emacs syntax tables, so it is probably easier to just use
> > parse-partial-sexp to do the job.
> 
> Well, I was kind of hoping that Semantic would at least know what's
> the best "good start location" (I'd expect it to need that itself
> when the buffer is updated) and/or it would already have up-to-date
> (to the extent that it's possible to be up-to-date) information
> about the current context that you could use for building tools.
> Using parse-partial-sexp feels like an abstraction violation (maybe
> in the future Semantic will use something else than Emacs syntax
> tables).

Yes, Semantic does know a good starting point.  You can use

(semantic-current-tag)

to get the tag under point.  You can then use

(semantic-tag-start TAG)

to get a starting point.  If no tag under point, you can use

semantic-find-tag-by-overlay-prev

to find the previous tag, whos end point would be a safe starting place.

Semantic uses syntax tables in order to use Emacs built-ins for parsing
data.  Semantic could use just about anything I suppose, but since it
overlays the buffer with tag info, that seems the most rational thing to
do.

Eric

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