[Haskell-cafe] monadic parser with Happy and Alex
duncan.coutts at worc.ox.ac.uk
Sat Oct 4 16:34:10 EDT 2008
On Sat, 2008-10-04 at 17:05 +0200, Manlio Perillo wrote:
> I have completed a draft of a CSS lexer, using Alex.
> The lexer use the posn wrapper.
> Now I'm starting to write the parser with Happy, however for the final
> product I would like to:
> 1) Be able to do I/O in the lexer, for stylesheets inclusion
> (@import rule)
> 2) be able to keep state in the parser (or lexer?), for character
> transcoding (@charset rule)
> This should be possible with Happy (and there are some example), however
> I don't find examples that make use of a lexer written with Alex.
See c2hs or Language.C it uses a monadic lexer.
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