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-- re2hs $INPUT -o $OUTPUT --header lexer/state.hs -i
{-# OPTIONS_GHC -Wno-unused-record-wildcards #-}
{-# LANGUAGE OverloadedStrings #-}
import Control.Monad (when)
import Data.ByteString (index)
import State
%{header:on %}
module State where
import Data.ByteString (ByteString)
data State = State {
_yyinput :: !ByteString,
_yycursor :: !Int,
%{stags format = "\n@@{tag} :: !Int,"; %}
_tag :: !Int
}
%{header:off %}
%{
re2c:YYFN = ["lexer;Int", "State{..};State"];
re2c:tags = 1;
re2c:yyfill:enable = 0;
re2c:header = "lexer/state.hs";
[a]* @_tag [b]* { _tag }
%}
main :: IO ()
main = do
let s = State {
_yyinput = "ab\0",
_yycursor = 0,
%{stags format = "\n@@{tag} = -1,"; %}
_tag = 0}
when (lexer s /= 1) $ error "failed!"
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