packages feed

MiniAgda-0.2016.12.19: src/Lexer.hs

{-# OPTIONS_GHC -fno-warn-unused-binds -fno-warn-missing-signatures #-}
{-# LANGUAGE CPP #-}
{-# LINE 2 "Lexer.x" #-}


module Lexer 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 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 "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 (0,160) [-8,10,221,202,349,560,688,415,0,801,0,929,1057,1313,1249,0,0,1362,0,1427,1683,1619,0,-3,1865,2076,0,1837,2293,2377,2461,2545,2629,2713,2797,2881,2965,3049,3133,3217,3301,3385,3469,3553,3637,3721,3805,3889,0,0,3973,0,0,4057,-34,0,0,0,0,0,-50,0,0,0,0,0,-30,-31,0,0,0,0,0,0,0,0,0,-36,0,70,4141,4225,4309,4393,4477,4561,4645,4729,4813,4897,4981,5065,5149,5233,5317,5401,5485,5569,5653,5737,5821,5905,5989,6073,6157,6241,6325,6409,6493,6577,6661,6745,6829,6913,6997,7081,7165,7249,7333,7417,7501,7585,7669,7753,7837,7921,8005,8089,8173,8257,8341,8425,8509,8593,8677,8761,8845,8929,9013,9097,9181,9265,9349,9433,9517,9601,9685,9769,9853,9937,10021,10105,10189,10273,10357,10441,10525,10609,10693,10777,10861]

alex_table :: Array Int Int
alex_table = listArray (0,11116) 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alex_check :: Array Int Int
alex_check = listArray (0,11116) 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alex_deflt :: Array Int Int
alex_deflt = listArray (0,160) [-1,5,5,-1,-1,5,-1,15,15,8,8,-1,-1,5,5,5,18,18,22,22,24,24,24,-1,24,5,-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,-1,-1]

alex_accept = listArray (0::Int,160) [AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccNone,AlexAccSkip,AlexAccSkip,AlexAccSkip,AlexAccSkip,AlexAcc (alex_action_3),AlexAcc (alex_action_4),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),AlexAcc (alex_action_13),AlexAcc (alex_action_14),AlexAcc (alex_action_15),AlexAcc (alex_action_16),AlexAcc (alex_action_17),AlexAcc (alex_action_18),AlexAcc (alex_action_19),AlexAcc (alex_action_20),AlexAcc (alex_action_21),AlexAcc (alex_action_22),AlexAcc (alex_action_23),AlexAcc (alex_action_24),AlexAcc (alex_action_25),AlexAcc (alex_action_26),AlexAcc (alex_action_27),AlexAcc (alex_action_28),AlexAcc (alex_action_29),AlexAcc (alex_action_30),AlexAcc (alex_action_31),AlexAcc (alex_action_32),AlexAcc (alex_action_33),AlexAcc (alex_action_34),AlexAcc (alex_action_35),AlexAcc (alex_action_36),AlexAcc (alex_action_37),AlexAcc (alex_action_38),AlexAcc (alex_action_39),AlexAcc (alex_action_40),AlexAcc (alex_action_41),AlexAcc (alex_action_42),AlexAcc (alex_action_43),AlexAcc (alex_action_44),AlexAcc (alex_action_45),AlexAcc (alex_action_46),AlexAcc (alex_action_47),AlexAcc (alex_action_48),AlexAcc (alex_action_49),AlexAcc (alex_action_50),AlexAcc (alex_action_51),AlexAcc (alex_action_52),AlexAcc (alex_action_53),AlexAcc (alex_action_54),AlexAcc (alex_action_55),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_56),AlexAcc (alex_action_57)]
{-# LINE 80 "Lexer.x" #-}

data Token = Id String AlexPosn
           | QualId (String, String) AlexPosn
     	   | Number String AlexPosn
     	   | Sized AlexPosn
           | Data AlexPosn
	   | CoData AlexPosn
	   | Record AlexPosn
	   | Fields AlexPosn
	   | Mutual AlexPosn
           | Fun AlexPosn
           | CoFun AlexPosn
           | Pattern AlexPosn
	   | Case AlexPosn
	   | Def AlexPosn
	   | Let AlexPosn
	   | In AlexPosn
           | Type AlexPosn
           | Set AlexPosn
           | CoSet AlexPosn
	   | Eval AlexPosn
	   | Fail AlexPosn
	   | Check AlexPosn
	   | TrustMe AlexPosn
	   | Impredicative AlexPosn
           -- size type
           | Size AlexPosn
           | Infty AlexPosn
           | Succ AlexPosn
           | Max AlexPosn
           --
           | LTri AlexPosn
           | RTri AlexPosn
           | AngleOpen AlexPosn
           | AngleClose AlexPosn
           | BrOpen AlexPosn
           | BrClose AlexPosn
           | BracketOpen AlexPosn
           | BracketClose AlexPosn
           | PrOpen AlexPosn
           | PrClose AlexPosn
           | Bar AlexPosn
           | Sem AlexPosn
           | Col AlexPosn
	   | Comma AlexPosn
	   | Dot AlexPosn
           | Arrow AlexPosn
           | Leq AlexPosn
           | Eq AlexPosn
	   | PlusPlus AlexPosn
	   | Plus AlexPosn
	   | Minus AlexPosn
	   | Slash AlexPosn
	   | Times AlexPosn
	   | Hat AlexPosn
	   | Amp AlexPosn
           | Lam AlexPosn
           | Underscore AlexPosn
           | NotUsed AlexPosn -- so happy doesn't generate overlap case pattern warning
             deriving (Eq)

qualId s p = let (m, '.':n) = break (== '.') s in QualId (m,n) p

prettyTok :: Token -> String
prettyTok c = "\"" ++ tk ++ "\" at " ++ (prettyAlexPosn pos) where
  (tk,pos) = case c of
    (Id s p) -> (show s,p)
    (QualId (m, n) p) -> (show m ++ "." ++ show n, p)
    (Number i p) -> (i,p)
    Sized p -> ("sized",p)
    Data p -> ("data",p)
    CoData p -> ("codata",p)
    Record p -> ("record",p)
    Fields p -> ("fields",p)
    Mutual p -> ("mutual",p)
    Fun p -> ("fun",p)
    CoFun p -> ("cofun",p)
    Pattern p -> ("pattern",p)
    Case p -> ("case",p)
    Def p -> ("def",p)
    Let p -> ("let",p)
    In p -> ("in",p)
    Eval p -> ("eval",p)
    Fail p -> ("fail",p)
    Check p -> ("check",p)
    TrustMe p -> ("trustme",p)
    Impredicative p -> ("impredicative",p)
    Type p -> ("Type",p)
    Set p -> ("Set",p)
    CoSet p -> ("CoSet",p)
    Size p -> ("Size",p)
    Infty p -> ("#",p)
    Succ p -> ("$",p)
    Max p -> ("max",p)
    LTri p -> ("<|",p)
    RTri p -> ("|>",p)
    AngleOpen p -> ("<",p)
    AngleClose p -> (">",p)
    BrOpen p -> ("{",p)
    BrClose p -> ("}",p)
    BracketOpen p -> ("[",p)
    BracketClose p -> ("]",p)
    PrOpen p -> ("(",p)
    PrClose p -> (")",p)
    Bar p -> ("|",p)
    Sem p -> (";",p)
    Col p -> (":",p)
    Comma p -> (",",p)
    Dot p -> (".",p)
    Arrow p -> ("->",p)
    Leq p -> ("<=",p)
    Eq p -> ("=",p)
    PlusPlus p -> ("++",p)
    Plus p -> ("+",p)
    Minus p -> ("-",p)
    Slash p -> ("/",p)
    Times p -> ("*",p)
    Hat p -> ("^",p)
    Amp p -> ("&",p)
    Lam p -> ("\\",p)
    Underscore p -> ("_",p)
    _ -> error "not used"


prettyAlexPosn (AlexPn _ line row) = "line " ++ show line ++ ", row " ++ show row

tok f p s = f p s


alex_action_3 =  tok (\p s -> Sized p) 
alex_action_4 =  tok (\p s -> Data p) 
alex_action_5 =  tok (\p s -> CoData p) 
alex_action_6 =  tok (\p s -> Record p) 
alex_action_7 =  tok (\p s -> Fields p) 
alex_action_8 =  tok (\p s -> Fun p) 
alex_action_9 =  tok (\p s -> CoFun p) 
alex_action_10 =  tok (\p s -> Pattern p) 
alex_action_11 =  tok (\p s -> Case p) 
alex_action_12 =  tok (\p s -> Def p) 
alex_action_13 =  tok (\p s -> Let p) 
alex_action_14 =  tok (\p s -> In p) 
alex_action_15 =  tok (\p s -> Eval p)
alex_action_16 =  tok (\p s -> Fail p)
alex_action_17 =  tok (\p s -> Check p)
alex_action_18 =  tok (\p s -> TrustMe p)
alex_action_19 =  tok (\p s -> Impredicative p)
alex_action_20 =  tok (\p s -> Mutual p) 
alex_action_21 =  tok (\p s -> Type p) 
alex_action_22 =  tok (\p s -> Set p) 
alex_action_23 =  tok (\p s -> CoSet p) 
alex_action_24 =  tok (\p s -> LTri p) 
alex_action_25 =  tok (\p s -> RTri p) 
alex_action_26 =  tok (\p s -> Size p) 
alex_action_27 =  tok (\p s -> Infty p) 
alex_action_28 =  tok (\p s -> Succ p) 
alex_action_29 =  tok (\p s -> Max p) 
alex_action_30 =  tok (\p s -> BrOpen p) 
alex_action_31 =  tok (\p s -> BrClose p) 
alex_action_32 =  tok (\p s -> BracketOpen p) 
alex_action_33 =  tok (\p s -> BracketClose p) 
alex_action_34 =  tok (\p s -> PrOpen p) 
alex_action_35 =  tok (\p s -> PrClose p) 
alex_action_36 =  tok (\p s -> Bar p) 
alex_action_37 =  tok (\p s -> Sem p) 
alex_action_38 =  tok (\p s -> Col p) 
alex_action_39 =  tok (\p s -> Comma p) 
alex_action_40 =  tok (\p s -> Dot p) 
alex_action_41 =  tok (\p s -> PlusPlus p) 
alex_action_42 =  tok (\p s -> Plus p) 
alex_action_43 =  tok (\p s -> Minus p) 
alex_action_44 =  tok (\p s -> Slash p) 
alex_action_45 =  tok (\p s -> Times p) 
alex_action_46 =  tok (\p s -> Hat p) 
alex_action_47 =  tok (\p s -> Amp p) 
alex_action_48 =  tok (\p s -> Arrow p)  
alex_action_49 =  tok (\p s -> Leq p)  
alex_action_50 =  tok (\p s -> Eq p) 
alex_action_51 =  tok (\p s -> Lam p) 
alex_action_52 =  tok (\p s -> Underscore p) 
alex_action_53 =  tok (\p s -> AngleOpen p) 
alex_action_54 =  tok (\p s -> AngleClose p) 
alex_action_55 =  tok (\p s -> (Number s p )) 
alex_action_56 =  tok (\p s -> (Id s p )) 
alex_action_57 =  tok (\p s -> (qualId s p)) 
{-# LINE 1 "templates/GenericTemplate.hs" #-}
{-# LINE 1 "templates/GenericTemplate.hs" #-}
{-# LINE 1 "<built-in>" #-}
{-# LINE 1 "<command-line>" #-}







# 1 "/usr/include/stdc-predef.h" 1 3 4

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










































{-# LINE 7 "<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.