integration with Python mode

integration with Python mode

[Paul Pogonyshev]

Hi,

I'd like to build support of Python mode into my Typesetter minor
mode [1].  In particular, I don't want it to insert special characters
outside of Python strings (and maybe comments.)  How do I determine if
the point is inside a string in Python mode?  Is there a better way
than checking 'face property?

Paul

[1] https://gna.org/projects/typesetter-el/

Re: integration with Python mode

[Stefan Monnier]

> I'd like to build support of Python mode into my Typesetter minor
> mode [1].  In particular, I don't want it to insert special characters
> outside of Python strings (and maybe comments.)  How do I determine if
> the point is inside a string in Python mode?

How do you do it in other major modes?  I don't think python-mode is special
in this respect.

> Is there a better way than checking 'face property?

How 'bout (nth 3 (syntax-ppss <pos>)) ?


        Stefan

Re: integration with Python mode

[Paul Pogonyshev]

Stefan Monnier wrote:
> > I'd like to build support of Python mode into my Typesetter minor
> > mode [1].  In particular, I don't want it to insert special characters
> > outside of Python strings (and maybe comments.)  How do I determine if
> > the point is inside a string in Python mode?
> 
> How do you do it in other major modes?  I don't think python-mode is special
> in this respect.

Well, I heavily depend on major mode.  Typesetter mode converts normal
characters like " and - to typographically valid punctuation characters,
like “”, ‘’ or — etc.  Of course, such characters must not be inserted
in contexts that don't expect them, e.g. outside strings in programming
modes.

> > Is there a better way than checking 'face property?
> 
> How 'bout (nth 3 (syntax-ppss <pos>)) ?

Thanks.  Documentation says it parses Lisp syntax, however.  Will it
give proper results in Python buffers?

Paul

Re: integration with Python mode

[Paul Pogonyshev]

Stefan Monnier wrote:
> How 'bout (nth 3 (syntax-ppss <pos>)) ?

BTW, there is `syntax-ppss-context', which seems to be more high-level.
However, it is not documented.  Can I still use it or should it be
considered private?

Paul

Re: integration with Python mode

[Stefan Monnier]

>> > I'd like to build support of Python mode into my Typesetter minor
>> > mode [1].  In particular, I don't want it to insert special characters
>> > outside of Python strings (and maybe comments.)  How do I determine if
>> > the point is inside a string in Python mode?
>> 
>> How do you do it in other major modes?  I don't think python-mode is special
>> in this respect.

> Well, I heavily depend on major mode.

That doesn't tell me "how you do it" in other major modes.
E.g. how do you do it in C mode?

>> > Is there a better way than checking 'face property?
>> How 'bout (nth 3 (syntax-ppss <pos>)) ?
> Thanks.  Documentation says it parses Lisp syntax, however.

Report it as a documentation bug.

> Will it give proper results in Python buffers?

It's used by font-lock.  Try it,


        Stefan

Re: integration with Python mode

[Stefan Monnier]

>> How 'bout (nth 3 (syntax-ppss <pos>)) ?

> BTW, there is `syntax-ppss-context', which seems to be more high-level.
> However, it is not documented.  Can I still use it or should it be
> considered private?

I don't recommend its use,


        Stefan

Re: integration with Python mode

[Paul Pogonyshev]

Stefan Monnier wrote:
> >> > I'd like to build support of Python mode into my Typesetter minor
> >> > mode [1].  In particular, I don't want it to insert special characters
> >> > outside of Python strings (and maybe comments.)  How do I determine if
> >> > the point is inside a string in Python mode?
> >> 
> >> How do you do it in other major modes?  I don't think python-mode is special
> >> in this respect.
> 
> > Well, I heavily depend on major mode.
> 
> That doesn't tell me "how you do it" in other major modes.
> E.g. how do you do it in C mode?

I use `c-in-literal' and `c-literal-limits'.  If `syntax-ppss'
works with all modes (i.e. more generic), I should use that one
instead, of course.

> >> > Is there a better way than checking 'face property?
> >> How 'bout (nth 3 (syntax-ppss <pos>)) ?
> > Thanks.  Documentation says it parses Lisp syntax, however.
> 
> Report it as a documentation bug.

Uh, can it be just fixed, without additional bureacracy?  AFAIK
there isn't even a bug tracker for Emacs, though I may be wrong
here.

> > Will it give proper results in Python buffers?
> 
> It's used by font-lock.  Try it,

OK, I already did.

Paul

Re: integration with Python mode

[Stefan Monnier]

>> >> > I'd like to build support of Python mode into my Typesetter minor
>> >> > mode [1].  In particular, I don't want it to insert special characters
>> >> > outside of Python strings (and maybe comments.)  How do I determine if
>> >> > the point is inside a string in Python mode?
>> >> How do you do it in other major modes?  I don't think python-mode is special
>> >> in this respect.
>> > Well, I heavily depend on major mode.
>> That doesn't tell me "how you do it" in other major modes.
>> E.g. how do you do it in C mode?

> I use `c-in-literal' and `c-literal-limits'.  If `syntax-ppss'
> works with all modes (i.e. more generic), I should use that one
> instead, of course.

syntax-ppss should work with more or less all modes, but it may not be
100% in all modes, depending on how faithfully syntax-tables can express the
language's lexical rules.

>> >> > Is there a better way than checking 'face property?
>> >> How 'bout (nth 3 (syntax-ppss <pos>)) ?
>> > Thanks.  Documentation says it parses Lisp syntax, however.
>> Report it as a documentation bug.

> Uh, can it be just fixed, without additional bureacracy?

Yes, except I'm not sure how to fix it, so it's better to bring it to the
attention of other people.

> AFAIK there isn't even a bug tracker for Emacs, though I may be
> wrong here.

M-x report-emacs-bug will send an email to the proper place.  Much quicker
to use than a bug-tracker.


        Stefan

Re: integration with Python mode

[Lennart Borgman (gmail)]

Stefan Monnier wrote:
> syntax-ppss should work with more or less all modes, but it may not be
> 100% in all modes, depending on how faithfully syntax-tables can express the
> language's lexical rules.


Except modes like nxml-mode which does their own parsing IIUC.