[Haskell-cafe] monadic parser with Happy and Alex

[Manlio Perillo]

Duncan Coutts ha scritto:
> [...]
>> 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.
> 


Thanks.
I'm also looking at HJS (unfortunately new versions use Parsec instead 
of Alex + Happy).

> Duncan
> 


Manlio