[Haskell-cafe] problem with happy

[Roman Dzvinkovsky]

Great thanks! All work right now.

2010/10/26 Stephen Tetley <stephen.tetley at gmail.com>

> The lexer was wrong - but it was the lexer function not the lexer spec
> - try the one below.
>
> Note that you have to take 'len' chars from the original input.
> Previously you were taking the whole of the "rest-of--input":
>
> lexer :: (TheToken -> P a) -> P a
> lexer f input@(_,_,instr) =
>  case alexScan input 0 of
>    AlexEOF -> f Eof input
>    AlexError (pos, _, _) ->
>      Failed $ showPos pos ++ ": lexical error"
>    AlexSkip input' len -> lexer f input'
>    AlexToken (pos, c, str) len act ->
>      let (Token newpos thetok) = act pos (take len instr)
>      in f thetok (newpos, c, str)
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