Automatic generation of .pyi typing stub files

[Robin Jarry]

Hi all,

I am currently getting my head around type hinting in python 3. For those who are not familiar with this concept, it has been introduced in PEP 484.

https://www.python.org/dev/peps/pep-0484/

When working with compiled C extensions, the only way for static type checkers to work properly is to provide "stub" files which contain the typing annotations about the symbols exported by the compiled modules.

https://www.python.org/dev/peps/pep-0484/#stub-files

I wonder if it would be possible for CFFI to generate these stub files while generating the C code for the compiled extensions. I do not have enough knowledge of CFFI inner workings to attempt such a task by myself but I would like to help.

What do you think?

Thanks in advance for your feedback.

-- 

Robin

[Armin Rigo]

Hi,

On Thu, 9 Jul 2020 at 18:53, Robin Jarry <robin...@6wind.com> wrote:
> I am currently getting my head around type hinting in python 3. For those who are not familiar with this concept, it has been introduced in PEP 484.

I have no interest in this PEP 484 myself. But yes, it looks doable
to produce whatever extra information you need along with the
generated C code, by extending cffi/recompiler.py.


A bientôt,

Armin.

[Robin Jarry]

Hi Armin,

2020-07-10, Armin Rigo:

> I have no interest in this PEP 484 myself. But yes, it looks doable
> to produce whatever extra information you need along with the
> generated C code, by extending cffi/recompiler.py.

Merci for the pointers. I'll see if I can attempt a draft pull request.

Robin

[Armin Rigo]

Hi again, 

Let me warn you that I may be unwilling to merge a complex set of new code inside cffi. You should probably focus on making an independent, separately distributed add-on. But you can likely depend on the internals of cffi in your code: I do not expect cffi to evolve a lot in the future.

A bientôt, 

Armin 

[Daniel Holth]

Here's my quick & dirty compiler that iterates over cffi's declarations to build SDL-specific Python wrappers. https://github.com/dholth/pysdl2-cffi/blob/master/builder/builder.py

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