Re: transpose-sexps

[Paul Pogonyshev]

Stuart D. Herring wrote:
> > It is probably possible to ask current major mode if we are in a string.
> > If it is not possible, than it is probably worth it to invent a consistent
> > interface that major modes would implement.  I agree that it is not to be
> > done now, of course.  (And while I'm at it, it's a pity that "now" spans
> > the last two years or so.)
> 
> Again, this is not a question of inventiveness, consistency, or any other
> kind of design or programming at all.  It's a mathematical question,
> really: it is easy to ask the question and to devise a mechanism for doing
> so, but it is algorithmically non-trivial to determine the answer.

According to Stefan Monier, you can already ask `syntax-ppss'.  And that
function already does some caching if I was to say from its code.

Paul