[ELPA] New package: parsec

[ELPA] New package: parsec

[Junpeng Qiu]

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Hello Emacs,

I've added a new package "parsec" to GNU ELPA (hoping I've not messed up
anything). This is a parser combinator library for Emacs Lisp, similar to
Haskell's parsec. The work is inspired by John's [emacs-pl]. The main repo
of parsec is on GitHub: https://github.com/cute-jumper/parsec.el.

John's [emacs-pl] is awesome, but I found following problems when I tried
to use it:
- it only contains a very limited set of combinators
- Some of its functions (combinators) have different behaviors than their
Haskell counterparts
- It can't show error messages when parsing fails.

The new library, parsec, contains most of the parser combinators in
"Text.Parsec.Combinator" (I'm adding more gradually), and I tried my best
to keep their behavior the same as their Haskell counterparts so that
programmer with Haskell background could easily use the library. You can
see the table listing all of the functions/macros in the README. It's a
long list so I'll skip it here. Parsec also comes with a simple error
handling mechanism, which may be improved in the future.

To give a short example, the following code extract the "hello" from the
comment:

  (parsec-with-input "/* hello */"
    (parsec-string "/*")
    (parsec-many-till-as-string (parsec-any-ch)
                                (parsec-try
                                 (parsec-string "*/"))))

More examples can be found at
https://github.com/cute-jumper/parsec.el/tree/master/examples.

[emacs-pl]: https://github.com/cute-jumper/parsec.el

Thanks,
-Junpeng

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Re: [ELPA] New package: parsec

[Junpeng Qiu]

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Sorry. I seemed to paste the wrong URL for John's emacs-pl. Here you go:

[emacs-pl]: https://github.com/jwiegley/emacs-pl

Thanks,
-Junpeng

On Tue, Oct 25, 2016 at 4:17 PM, Junpeng Qiu <qjpchmail@gmail.com> wrote:

> Hello Emacs,
>
> I've added a new package "parsec" to GNU ELPA (hoping I've not messed up
> anything). This is a parser combinator library for Emacs Lisp, similar to
> Haskell's parsec. The work is inspired by John's [emacs-pl]. The main repo
> of parsec is on GitHub: https://github.com/cute-jumper/parsec.el.
>
> John's [emacs-pl] is awesome, but I found following problems when I tried
> to use it:
> - it only contains a very limited set of combinators
> - Some of its functions (combinators) have different behaviors than their
> Haskell counterparts
> - It can't show error messages when parsing fails.
>
> The new library, parsec, contains most of the parser combinators in
> "Text.Parsec.Combinator" (I'm adding more gradually), and I tried my best
> to keep their behavior the same as their Haskell counterparts so that
> programmer with Haskell background could easily use the library. You can
> see the table listing all of the functions/macros in the README. It's a
> long list so I'll skip it here. Parsec also comes with a simple error
> handling mechanism, which may be improved in the future.
>
> To give a short example, the following code extract the "hello" from the
> comment:
>
>   (parsec-with-input "/* hello */"
>     (parsec-string "/*")
>     (parsec-many-till-as-string (parsec-any-ch)
>                                 (parsec-try
>                                  (parsec-string "*/"))))
>
> More examples can be found at https://github.com/cute-
> jumper/parsec.el/tree/master/examples.
>
> [emacs-pl]: https://github.com/cute-jumper/parsec.el
>
> Thanks,
> -Junpeng
>

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Re: [ELPA] New package: parsec

[John Wiegley]

>>>>> "JQ" == Junpeng Qiu <qjpchmail@gmail.com> writes:

JQ> Sorry. I seemed to paste the wrong URL for John's emacs-pl. Here you go:
JQ> [emacs-pl]: https://github.com/jwiegley/emacs-pl

Thanks for the link, Junpeng! In return for your gracious contribution, I
offer a new Haskell library to play with that you might find useful, since it
should make it possible for you to compile Haskell-written Parsec parsers into
their corresponding Emacs Lisp "parsec" equivalents -- or at least part of the
way. :)

    http://hackage.haskell.org/package/parsec-free

-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2

Re: [ELPA] New package: parsec

[Junpeng Qiu]

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It is a very interesting idea to combine Free Monad with Parsec. I'll take
a look at it.

>> make it possible for you to compile Haskell-written Parsec parsers into
their corresponding Emacs Lisp "parsec" equivalents

It would be awesome if we can finally do this. For the time being, I'll
mainly working on making parsec more complete, porting more Haskell
functions to Emacs Lisp. It still needs to be more polished to become
really useful.

Thanks for your emacs-pl and the information!

Best,
-Junpeng

On Tue, Oct 25, 2016 at 5:46 PM, John Wiegley <jwiegley@gmail.com> wrote:

> >>>>> "JQ" == Junpeng Qiu <qjpchmail@gmail.com> writes:
>
> JQ> Sorry. I seemed to paste the wrong URL for John's emacs-pl. Here you
> go:
> JQ> [emacs-pl]: https://github.com/jwiegley/emacs-pl
>
> Thanks for the link, Junpeng! In return for your gracious contribution, I
> offer a new Haskell library to play with that you might find useful, since
> it
> should make it possible for you to compile Haskell-written Parsec parsers
> into
> their corresponding Emacs Lisp "parsec" equivalents -- or at least part of
> the
> way. :)
>
>     http://hackage.haskell.org/package/parsec-free
>
> --
> John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
> http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2
>

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