[ELPA] New package: parsec

[Junpeng Qiu <qjpchmail@gmail.com>]

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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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