polyparse-1.4.1: A variety of alternative parser combinator libraries.




The Parser datatype

newtype Parser a Source

This Parser datatype is a specialised parsing monad with error reporting. Whereas the standard version can be used for arbitrary token types, this version is specialised to ByteString input only.


P (ByteString -> Result ByteString a) 

data Result z a Source

A return type like Either, that distinguishes not only between right and wrong answers, but also has commitment, so that a failure cannot be undone. This should only be used for writing very primitive parsers - really it is an internal detail of the library.


Success z a 
Failure z String 
Committed (Result z a) 


runParser :: Parser a -> ByteString -> (Either String a, ByteString)Source

Apply a parser to an input token sequence.

basic parsers


reparse :: ByteString -> Parser ()Source

Push some tokens back onto the front of the input stream and reparse. This is useful e.g. for recursively expanding macros. When the user-parser recognises a macro use, it can lookup the macro expansion from the parse state, lex it, and then stuff the lexed expansion back down into the parser.

Re-export all more general combinators