Naturally, there are many great resources for this at www.haskell.org
Ensure you check out both Alex and Happy for the parsing and sourcing. (note that Alex is currently being re-written, I'm not sure if the latest public version has the new format/syntax)
I think, parsing (including lexical analysis) is much simpler using only a combinator library like the one from Daan Leijen that is part of the ghc base library:
http://www.haskell.org/ghc/docs/latest/html/base/Text.ParserCombinators.Parsec.html
Cheers Christian
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