The syntax package
"syntax" allows you to write a single syntax description and instantiate is both as a parser and a pretty printer.
Syntax descriptions are written in applicative or arrow style. The library uses a custom typeclass hierarchy, provided
by the "semi-iso" package. Most of the time you will be using operators like
like parser combinators. When more power is needed - e.g. when the syntax depends on the parsed or printed value -
you turn to arrows.
Semi-isomorphisms from "semi-iso" are the basic building block of syntax descriptions. I recommend reading the hackage page of "semi-iso" first, as it contains much more information.
Once you write a syntax description (polymorphic in the syntax category) you can instantiate it both as a parser or as a pretty-printer. The library "syntax-attoparsec" gives you the ability to extract an Attoparsec parser. Pretty-printing is implemented by the "syntax-printer" library, which uses Text and ByteString builders. (Note that formatting is handled by "syntax" itself, not by the printer library)
Advanced formatting and parsing (for example indentation, haskell layout rule) is implemented as category transformers (similar to monad transformers). Currently only simple indentation is implemented (in Data.Syntax.Indent) - basically a reader category transformer that tracks current indentation level. I plan on implementing Haskell layout rule in the future.
The library can work with both text and binary data. Alas, there are no binary combinators implemented yet.
syntax-example-json for examples.
"syntax-example" implements a simple lambda calculus.
"syntax-example-json" implements a json parser and pretty printer.
|Versions||0.1.0.0, 0.1.1.0, 0.2.0.0, 0.2.1.0, 0.3.0.0, 126.96.36.199|
|Dependencies||base (==4.*), lens (>=4), mono-traversable, scientific (>=0.3), semi-iso (>=1), text, vector [details]|
|Copyright||Paweł Nowak 2014|
|Maintainer||Paweł Nowak <email@example.com>|
|Source repository||head: git clone firstname.lastname@example.org:Pawel834/syntax.git|
|Uploaded||Fri Dec 12 23:30:44 UTC 2014 by pawel834|
|Updated||Thu Nov 19 04:05:20 UTC 2015 by pawel834 to revision 2|
|Downloads||1066 total (11 in the last 30 days)|
|Status||Docs uploaded by user [build log]
All reported builds failed as of 2014-12-12 [all 1 reports]
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