Which wrapper are you using? I just recently did this for the monad
wrapper. It looks a little like this:
data Token
= EOF
| ....
alexEOF = return EOF
lexAll :: Alex [Token]
lexAll =
do x <- alexMonadScan
case x of
EOF -> []
_ -> lexAll >>= return . (:) x
lexString :: String -> [Token]
lexString str = runAlex str lexAll
The basic and posn wrappers have the "alexScanTokens" function which
does essentially the same thing.
Just slap on hGetContents and show and you're done.
Creighton Hogg wrote:
Hi,
I've read through the documentation on Alex abit, but since
I'm not the sharpest tool in the shed I'm not really seeing
the obvious way to take the output file of Alex and make a
program that will print out the list of tokens scanned from
an input file.
I had to do something like this this past week for a class,
but that was in Java so I wanted to try it in Haskell as
well but I'm stuck at the moment.
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