This is a library of parser combinators, originally written by Koen Claessen. It parses all alternatives in parallel, so it never keeps hold of the beginning of the input string, a common source of space leaks with other parsers. The '(+++)' choice combinator is genuinely commutative; it makes no difference which branch is "shorter".

See also Koen's paper Parallel Parsing Processes (http://www.cs.chalmers.se/~koen/publications.html).

This version of ReadP has been locally hacked to make it H98, by Martin Sjögren mailto:msjogren@gmail.com