Parsec is an industrial strength, monadic parser combinator library for Haskell. It can parse context-sensitive, infinite look-ahead grammars but it performs best on predictive (LL) grammars.
Parsec lets you construct parsers by combining higher-order Combinators to create larger expressions. Combinator parsers are written and used within the same programming language as the rest of the program. The parsers are first-class citizens of the language , unlike Happy parsers, which must be generated via a preprocessor.
Much more documentation can be found on the parsec site.
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Parsec clones in other languages
- PCL for O'Caml http://lprousnth.files.wordpress.com/2007/08/pcl.pdf
- JParsec for Java http://jparsec.codehaus.org/JParsec+Overview
- NParsec, JParsec ported to C# http://jparsec.codehaus.org/NParsec+Tutorial
- Ruby Parsec, JParsec ported to Ruby http://jparsec.codehaus.org/Ruby+Parsec
- FParsec for F# http://www.quanttec.com/fparsec/
- A small Parsec in Erlang http://www.engr.uconn.edu/~jeffm/Source/Erlang/
- AliceParsec for Alice ML http://www.ps.uni-sb.de/alice/contribs.html
- Parsnip for C++ http://parsnip-parser.sourceforge.net/
- Somewhere there is a Nemerle port
- Pysec for Python http://www.valuedlessons.com/2008/02/pysec-monadic-combinatoric-parsing-in.html
Interesting non-Parsec parser combinator libraries: