Re: [ELPA] New package: parsec

[Junpeng Qiu <qjpchmail@gmail.com>]

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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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