[Haskell-cafe] Re: [Haskell] Re: ANN: Haddock version 2.1.0

2008/5/9 Simon Marlow :

David Waern wrote:

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2008/5/8 Simon Marlow :

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So basically you want to run a lexer over the source again to collect all the comments?

Yes.

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You really want to use GHC's lexer, because otherwise you have to write another lexer.

I don't mind writing a lexer that just collects the comments. It should be simpler than a full Haskell lexer, right? It wouldn't need to handle layout, for instance. Using GHC is also a good option.

I'm not sure it's that much easier to write a lexer that just collects comments. For example, is there a comment here?

3#--foo

with -XMagicHash it is (3# followed by a comment), but without -XMagicHash it is not (3 followed by the operator #--). You have to implement a significant chunk of the options that GHC supports to get it right. I'd say its probably easier to work with GHC's lexer.

Ah, I didn't think about the GHC options that change the lexical syntax. You're right, using the GHC lexer should be easier. David