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-- re2hs $INPUT -o $OUTPUT -ib
{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -Wno-unused-record-wildcards #-}
import Data.Array (Array, array, (!))
import Data.Bits ((.&.))
import Data.Word (Word8)
import Data.ByteString (ByteString, index)
data State = State {
_yyinput :: ByteString,
_yycursor :: Int
}
%{
re2c:define:YYFN = ["lexer;Bool", "State{..};State"];
re2c:yyfill:enable = 0;
number = [1-9][0-9]*;
number { True }
* { False }
%}
main :: IO ()
main = case lexer State{_yyinput = "1234\0", _yycursor = 0} of
True -> return ()
False -> error "lexer failed!"
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