Lexer.hs

{-# OPTIONS_GHC -fno-warn-unused-binds -fno-warn-missing-signatures #-}
{-# LANGUAGE CPP #-}
{-# LINE 1 "Lexer.x" #-}


{-

ASN.2 - Version 2016

(C) Copyright Buster Kim Mejborn 2016

All Rights Reserved.

-}

module Lexer (Token(..), 
              Ident, 
        AlexPosn(..), alexScanTokens, 
        token_posn) where


#if __GLASGOW_HASKELL__ >= 603
#include "ghcconfig.h"
#elif defined(__GLASGOW_HASKELL__)
#include "config.h"
#endif
#if __GLASGOW_HASKELL__ >= 503
import Data.Array
import Data.Array.Base (unsafeAt)
#else
import Array
#endif
{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "templates/wrappers.hs" #-}
{-# LINE 1 "<built-in>" #-}
{-# LINE 1 "<command-line>" #-}
{-# LINE 9 "<command-line>" #-}
# 1 "/usr/include/stdc-predef.h" 1 3 4

# 17 "/usr/include/stdc-predef.h" 3 4















































{-# LINE 9 "<command-line>" #-}
{-# LINE 1 "/usr/lib/ghc-7.10.3/include/ghcversion.h" #-}

















{-# LINE 9 "<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 Data.Word (Word8)
{-# LINE 28 "templates/wrappers.hs" #-}

import Data.Char (ord)
import qualified Data.Bits

-- | Encode a Haskell String to a list of Word8 values, in UTF8 format.
utf8Encode :: Char -> [Word8]
utf8Encode = map fromIntegral . go . ord
 where
  go oc
   | oc <= 0x7f       = [oc]

   | oc <= 0x7ff      = [ 0xc0 + (oc `Data.Bits.shiftR` 6)
                        , 0x80 + oc Data.Bits..&. 0x3f
                        ]

   | oc <= 0xffff     = [ 0xe0 + (oc `Data.Bits.shiftR` 12)
                        , 0x80 + ((oc `Data.Bits.shiftR` 6) Data.Bits..&. 0x3f)
                        , 0x80 + oc Data.Bits..&. 0x3f
                        ]
   | otherwise        = [ 0xf0 + (oc `Data.Bits.shiftR` 18)
                        , 0x80 + ((oc `Data.Bits.shiftR` 12) Data.Bits..&. 0x3f)
                        , 0x80 + ((oc `Data.Bits.shiftR` 6) Data.Bits..&. 0x3f)
                        , 0x80 + oc Data.Bits..&. 0x3f
                        ]



type Byte = Word8

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


type AlexInput = (AlexPosn,     -- current position,
                  Char,         -- previous char
                  [Byte],       -- pending bytes on current char
                  String)       -- current input string

ignorePendingBytes :: AlexInput -> AlexInput
ignorePendingBytes (p,c,ps,s) = (p,c,[],s)

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

alexGetByte :: AlexInput -> Maybe (Byte,AlexInput)
alexGetByte (p,c,(b:bs),s) = Just (b,(p,c,bs,s))
alexGetByte (p,c,[],[]) = Nothing
alexGetByte (p,_,[],(c:s))  = let p' = alexMove p c 
                                  (b:bs) = utf8Encode c
                              in p' `seq`  Just (b, (p', c, bs, s))


{-# LINE 101 "templates/wrappers.hs" #-}

{-# LINE 119 "templates/wrappers.hs" #-}

{-# LINE 137 "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+alex_tab_size-1) `div` alex_tab_size)*alex_tab_size+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 271 "templates/wrappers.hs" #-}


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

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


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

{-# LINE 401 "templates/wrappers.hs" #-}


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

{-# LINE 421 "templates/wrappers.hs" #-}

{-# LINE 437 "templates/wrappers.hs" #-}


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

-- Adds text positions to the basic model.


--alexScanTokens :: String -> [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 (take len str) : go inp'



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

{-# LINE 470 "templates/wrappers.hs" #-}


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

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

alex_tab_size :: Int
alex_tab_size = 8
alex_base :: Array Int Int
alex_base = listArray (0,30) [-8,-76,0,37,0,165,293,549,485,0,-3,731,694,939,1014,1089,1164,1239,1314,1389,1464,1539,1614,1689,0,0,0,0,0,0,0]

alex_table :: Array Int Int
alex_table = listArray (0,1944) 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alex_check :: Array Int Int
alex_check = listArray (0,1944) [-1,9,10,11,12,13,9,10,11,12,13,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,32,-1,-1,35,-1,32,-1,-1,40,41,42,-1,44,-1,-1,-1,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,61,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,-1,93,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,10,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,48,49,50,51,52,53,54,55,56,57,-1,-1,-1,-1,-1,-1,-1,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,-1,-1,-1,-1,95,-1,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1]

alex_deflt :: Array Int Int
alex_deflt = listArray (0,30) [-1,9,9,2,2,-1,-1,11,11,11,-1,11,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1]

alex_accept = listArray (0::Int,30) [AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccSkip,AlexAccSkip,AlexAcc (alex_action_2),AlexAcc (alex_action_3),AlexAcc (alex_action_4),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_5),AlexAcc (alex_action_6),AlexAcc (alex_action_7),AlexAcc (alex_action_8),AlexAcc (alex_action_9),AlexAcc (alex_action_10),AlexAcc (alex_action_11),AlexAcc (alex_action_12)]
{-# LINE 38 "Lexer.x" #-}


data Token= 
   TATOM AlexPosn Ident 
   | TOPENP AlexPosn
   | TCLOSEP AlexPosn
   | TOPENSQ AlexPosn
   | TCLOSESQ AlexPosn
   | TCOMMA AlexPosn
   | TEQ AlexPosn
   | TXML AlexPosn
   | TASN1 AlexPosn
   | TCOLON AlexPosn
   | TBYTE AlexPosn
   | TSTAR AlexPosn
   deriving (Eq,Show)

token_posn (TATOM p _)=p
token_posn (TOPENP p)=p
token_posn (TCLOSEP p)=p
token_posn (TOPENSQ p)=p
token_posn (TCLOSESQ p)=p
token_posn (TCOMMA p)=p
token_posn (TEQ p)=p
token_posn (TXML p)=p
token_posn (TASN1 p)=p
token_posn (TCOLON p)=p
token_posn (TBYTE p)=p
token_posn (TSTAR p)=p

type Ident = String

alex_action_2 =  (\ p s -> TXML p) 
alex_action_3 =  (\ p s -> TASN1 p) 
alex_action_4 =  (\ p s -> TBYTE p) 
alex_action_5 =  (\ p s -> TATOM p s) 
alex_action_6 =  (\ p s -> TOPENP p)  
alex_action_7 =  (\ p s -> TCLOSEP p) 
alex_action_8 =  (\ p s -> TOPENSQ p) 
alex_action_9 =  (\ p s -> TCLOSESQ p) 
alex_action_10 =  (\ p s -> TCOMMA p) 
alex_action_11 =  (\ p s -> TEQ p) 
alex_action_12 =  (\ p s -> TSTAR p) 
{-# LINE 1 "templates/GenericTemplate.hs" #-}
{-# LINE 1 "templates/GenericTemplate.hs" #-}
{-# LINE 1 "<built-in>" #-}
{-# LINE 1 "<command-line>" #-}
{-# LINE 8 "<command-line>" #-}
# 1 "/usr/include/stdc-predef.h" 1 3 4

# 17 "/usr/include/stdc-predef.h" 3 4















































{-# LINE 8 "<command-line>" #-}
{-# LINE 1 "/usr/lib/ghc-7.10.3/include/ghcversion.h" #-}

















{-# LINE 8 "<command-line>" #-}
{-# LINE 1 "templates/GenericTemplate.hs" #-}
-- -----------------------------------------------------------------------------
-- ALEX TEMPLATE
--
-- This code is in the PUBLIC DOMAIN; you may copy it freely and use
-- it for any purpose whatsoever.

-- -----------------------------------------------------------------------------
-- INTERNALS and main scanner engine

{-# LINE 21 "templates/GenericTemplate.hs" #-}

{-# LINE 51 "templates/GenericTemplate.hs" #-}

{-# LINE 72 "templates/GenericTemplate.hs" #-}
alexIndexInt16OffAddr arr off = arr ! off


{-# LINE 93 "templates/GenericTemplate.hs" #-}
alexIndexInt32OffAddr arr off = arr ! off


{-# LINE 105 "templates/GenericTemplate.hs" #-}
quickIndex arr i = arr ! i


-- -----------------------------------------------------------------------------
-- Main lexing routines

data AlexReturn a
  = AlexEOF
  | AlexError  !AlexInput
  | AlexSkip   !AlexInput !Int
  | AlexToken  !AlexInput !Int a

-- alexScan :: AlexInput -> StartCode -> AlexReturn a
alexScan input (sc)
  = alexScanUser undefined input (sc)

alexScanUser user input (sc)
  = case alex_scan_tkn user input (0) input sc AlexNone of
        (AlexNone, input') ->
                case alexGetByte input of
                        Nothing -> 



                                   AlexEOF
                        Just _ ->



                                   AlexError input'

        (AlexLastSkip input'' len, _) ->



                AlexSkip input'' len

        (AlexLastAcc k input''' len, _) ->



                AlexToken input''' len k


-- Push the input through the DFA, remembering the most recent accepting
-- state it encountered.

alex_scan_tkn user orig_input len input s last_acc =
  input `seq` -- strict in the input
  let 
        new_acc = (check_accs (alex_accept `quickIndex` (s)))
  in
  new_acc `seq`
  case alexGetByte input of
     Nothing -> (new_acc, input)
     Just (c, new_input) -> 



      case fromIntegral c of { (ord_c) ->
        let
                base   = alexIndexInt32OffAddr alex_base s
                offset = (base + ord_c)
                check  = alexIndexInt16OffAddr alex_check offset
                
                new_s = if (offset >= (0)) && (check == ord_c)
                          then alexIndexInt16OffAddr alex_table offset
                          else alexIndexInt16OffAddr alex_deflt s
        in
        case new_s of
            (-1) -> (new_acc, input)
                -- on an error, we want to keep the input *before* the
                -- character that failed, not after.
            _ -> alex_scan_tkn user orig_input (if c < 0x80 || c >= 0xC0 then (len + (1)) else len)
                                                -- note that the length is increased ONLY if this is the 1st byte in a char encoding)
                        new_input new_s new_acc
      }
  where
        check_accs (AlexAccNone) = last_acc
        check_accs (AlexAcc a  ) = AlexLastAcc a input (len)
        check_accs (AlexAccSkip) = AlexLastSkip  input (len)

        check_accs (AlexAccPred a predx rest)
           | predx user orig_input (len) input
           = AlexLastAcc a input (len)
           | otherwise
           = check_accs rest
        check_accs (AlexAccSkipPred predx rest)
           | predx user orig_input (len) input
           = AlexLastSkip input (len)
           | otherwise
           = check_accs rest


data AlexLastAcc a
  = AlexNone
  | AlexLastAcc a !AlexInput !Int
  | AlexLastSkip  !AlexInput !Int

instance Functor AlexLastAcc where
    fmap _ AlexNone = AlexNone
    fmap f (AlexLastAcc x y z) = AlexLastAcc (f x) y z
    fmap _ (AlexLastSkip x y) = AlexLastSkip x y

data AlexAcc a user
  = AlexAccNone
  | AlexAcc a
  | AlexAccSkip

  | AlexAccPred a   (AlexAccPred user) (AlexAcc a user)
  | AlexAccSkipPred (AlexAccPred user) (AlexAcc a user)

type AlexAccPred user = user -> AlexInput -> Int -> AlexInput -> Bool

-- -----------------------------------------------------------------------------
-- Predicates on a rule

alexAndPred p1 p2 user in1 len in2
  = p1 user in1 len in2 && p2 user in1 len in2

--alexPrevCharIsPred :: Char -> AlexAccPred _ 
alexPrevCharIs c _ input _ _ = c == alexInputPrevChar input

alexPrevCharMatches f _ input _ _ = f (alexInputPrevChar input)

--alexPrevCharIsOneOfPred :: Array Char Bool -> AlexAccPred _ 
alexPrevCharIsOneOf arr _ input _ _ = arr ! alexInputPrevChar input

--alexRightContext :: Int -> AlexAccPred _
alexRightContext (sc) user _ _ input = 
     case alex_scan_tkn user input (0) input sc AlexNone of
          (AlexNone, _) -> False
          _ -> True
        -- TODO: there's no need to find the longest
        -- match when checking the right context, just
        -- the first match will do.