{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "<built-in>" #-}
{-# LINE 1 "<command line>" #-}
{-# LINE 1 "templates/wrappers.hs" #-}
-- -----------------------------------------------------------------------------
-- Alex wrapper code.
--
-- This code is in the PUBLIC DOMAIN; you may copy it freely and use
-- it for any purpose whatsoever.



import qualified Data.ByteString.Lazy.Char8 as ByteString









-- -----------------------------------------------------------------------------
-- The input type

{-# LINE 35 "templates/wrappers.hs" #-}


type AlexInput = (AlexPosn,     -- current position,
                  Char,         -- previous char
                  ByteString.ByteString)        -- current input string

alexInputPrevChar :: AlexInput -> Char
alexInputPrevChar (p,c,s) = c

alexGetChar :: AlexInput -> Maybe (Char,AlexInput)
alexGetChar (p,_,cs) | ByteString.null cs = Nothing
                     | otherwise = let c   = ByteString.head cs
                                       cs' = ByteString.tail cs
                                       p'  = alexMove p c
                                    in p' `seq` cs' `seq` Just (c, (p', c, cs'))


-- -----------------------------------------------------------------------------
-- Token positions

-- `Posn' records the location of a token in the input text.  It has three
-- fields: the address (number of chacaters preceding the token), line number
-- and column of a token within the file. `start_pos' gives the position of the
-- start of the file and `eof_pos' a standard encoding for the end of file.
-- `move_pos' calculates the new position after traversing a given character,
-- assuming the usual eight character tab stops.


data AlexPosn = AlexPn !Int !Int !Int
        deriving (Eq,Show)

alexStartPos :: AlexPosn
alexStartPos = AlexPn 0 1 1

alexMove :: AlexPosn -> Char -> AlexPosn
alexMove (AlexPn a l c) '\t' = AlexPn (a+1)  l     (((c+7) `div` 8)*8+1)
alexMove (AlexPn a l c) '\n' = AlexPn (a+1) (l+1)   1
alexMove (AlexPn a l c) _    = AlexPn (a+1)  l     (c+1)


-- -----------------------------------------------------------------------------
-- Default monad

{-# LINE 162 "templates/wrappers.hs" #-}


-- -----------------------------------------------------------------------------
-- Monad (with ByteString input)


data AlexState = AlexState {
        alex_pos :: !AlexPosn,  -- position at current input location
        alex_inp :: ByteString.ByteString,      -- the current input
        alex_chr :: !Char,      -- the character before the input
        alex_scd :: !Int        -- the current startcode

      , alex_ust :: AlexUserState -- AlexUserState will be defined in the user program

    }

-- Compile with -funbox-strict-fields for best results!

runAlex :: ByteString.ByteString -> Alex a -> Either String a
runAlex input (Alex f) 
   = case f (AlexState {alex_pos = alexStartPos,
                        alex_inp = input,       
                        alex_chr = '\n',

                        alex_ust = alexInitUserState,

                        alex_scd = 0}) of Left msg -> Left msg
                                          Right ( _, a ) -> Right a

newtype Alex a = Alex { unAlex :: AlexState -> Either String (AlexState, a) }

instance Monad Alex where
  m >>= k  = Alex $ \s -> case unAlex m s of 
                                Left msg -> Left msg
                                Right (s',a) -> unAlex (k a) s'
  return a = Alex $ \s -> Right (s,a)

alexGetInput :: Alex AlexInput
alexGetInput
 = Alex $ \s@AlexState{alex_pos=pos,alex_chr=c,alex_inp=inp} -> 
        Right (s, (pos,c,inp))

alexSetInput :: AlexInput -> Alex ()
alexSetInput (pos,c,inp)
 = Alex $ \s -> case s{alex_pos=pos,alex_chr=c,alex_inp=inp} of
                  s@(AlexState{}) -> Right (s, ())

alexError :: String -> Alex a
alexError message = Alex $ \s -> Left message

alexGetStartCode :: Alex Int
alexGetStartCode = Alex $ \s@AlexState{alex_scd=sc} -> Right (s, sc)

alexSetStartCode :: Int -> Alex ()
alexSetStartCode sc = Alex $ \s -> Right (s{alex_scd=sc}, ())

alexMonadScan = do
  inp <- alexGetInput
  sc <- alexGetStartCode
  case alexScan inp sc of
    AlexEOF -> alexEOF
    AlexError inp' -> alexError "lexical error"
    AlexSkip  inp' len -> do
        alexSetInput inp'
        alexMonadScan
    AlexToken inp' len action -> do
        alexSetInput inp'
        action inp len

-- -----------------------------------------------------------------------------
-- Useful token actions

type AlexAction result = AlexInput -> Int -> result

-- just ignore this token and scan another one
-- skip :: AlexAction result
skip input len = alexMonadScan

-- ignore this token, but set the start code to a new value
-- begin :: Int -> AlexAction result
begin code input len = do alexSetStartCode code; alexMonadScan

-- perform an action for this token, and set the start code to a new value
-- andBegin :: AlexAction result -> Int -> AlexAction result
(action `andBegin` code) input len = do alexSetStartCode code; action input len

-- token :: (String -> Int -> token) -> AlexAction token
token t input len = return (t input len)



-- -----------------------------------------------------------------------------
-- Basic wrapper

{-# LINE 273 "templates/wrappers.hs" #-}


-- -----------------------------------------------------------------------------
-- Basic wrapper, ByteString version

{-# LINE 297 "templates/wrappers.hs" #-}

{-# LINE 322 "templates/wrappers.hs" #-}


-- -----------------------------------------------------------------------------
-- Posn wrapper

-- Adds text positions to the basic model.

{-# LINE 339 "templates/wrappers.hs" #-}


-- -----------------------------------------------------------------------------
-- Posn wrapper, ByteString version

{-# LINE 354 "templates/wrappers.hs" #-}


-- -----------------------------------------------------------------------------
-- GScan wrapper

-- For compatibility with previous versions of Alex, and because we can.