Following suggestions, I have rewritten the parsing code using Parsec. I have to say, it was a good experience. Not everything worked first time, but I feel the code is a lot clearer that doing everything myself line by line. I've compared the two source files: DataAdvParser.hs and the new DataAdvParsec.hs. There's more lines in the Parsec based files because I've had problems with the normal Haskell layout, but the file is overall smaller. Moreover, I have discovered ambiguities and bugs in the initial version when I had to get Parsec to work properly. And of course looking at the Haskell code you actually understand the grammar of the input file...
I don't feel at the moment I'm getting better in Haskell: using Parsec just meant using a library API but didn't mean much in terms of learning the language or the underlying technologies (monads, etc...). I'm thinking maybe writing a little DSL for my adventure game data would help, but I haven't yet found a good tutorial. Ideally I'd like to get to something that's similar to what's been done for HTML or SQL, but for a very simple language...
Anyway, I'll see, next steps would be to write maybe an automated game world generator so that I could play a new game every time...
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