{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "templates/wrappers.hs" #-}
{-# 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 Control.Applicative (Applicative (..))
import Data.Word (Word8)


import qualified Data.Char
import qualified Data.ByteString.Lazy     as ByteString
import qualified Data.ByteString.Internal as ByteString (w2c)

{-# LINE 48 "templates/wrappers.hs" #-}

type Byte = Word8

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

{-# LINE 73 "templates/wrappers.hs" #-}


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

ignorePendingBytes :: AlexInput -> AlexInput
ignorePendingBytes i = i   -- no pending bytes when lexing bytestrings

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

alexGetByte :: AlexInput -> Maybe (Byte,AlexInput)
alexGetByte (p,_,cs) | ByteString.null cs = Nothing
                     | otherwise = let b   = ByteString.head cs
                                       cs' = ByteString.tail cs
                                       c   = ByteString.w2c b
                                       p'  = alexMove p c
                                    in p' `seq` cs' `seq` Just (b, (p', c, cs'))


{-# LINE 107 "templates/wrappers.hs" #-}

{-# LINE 122 "templates/wrappers.hs" #-}

-- -----------------------------------------------------------------------------
-- 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 256 "templates/wrappers.hs" #-}


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

{-# LINE 347 "templates/wrappers.hs" #-}


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

{-# LINE 374 "templates/wrappers.hs" #-}


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

{-# LINE 392 "templates/wrappers.hs" #-}

{-# LINE 406 "templates/wrappers.hs" #-}


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

-- Adds text positions to the basic model.

{-# LINE 423 "templates/wrappers.hs" #-}


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


--alexScanTokens :: ByteString -> [token]
alexScanTokens str = go (alexStartPos,'\n',str)
  where go inp@(pos,_,str) =
          case alexScan inp 0 of
                AlexEOF -> []
                AlexError ((AlexPn _ line column),_,_) -> error $ "lexical error at line " ++ (show line) ++ ", column " ++ (show column)
                AlexSkip  inp' len     -> go inp'
                AlexToken inp' len act -> act pos (ByteString.take (fromIntegral len) str) : go inp'



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

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