happytemplate-arrays

編譯器 像YACC的編譯及語法產生器

{-# LINE 1 "GenericTemplate.hs" #-}
-- $Id: GenericTemplate.hs,v 1.23 2002/05/23 09:24:27 simonmar Exp $

{-# LINE 15 "GenericTemplate.hs" #-}















data Happy_IntList = HappyCons Int Happy_IntList






































infixr 9 `HappyStk`
data HappyStk a = HappyStk a (HappyStk a)

-----------------------------------------------------------------------------
-- starting the parse

happyParse start_state = happyNewToken start_state notHappyAtAll notHappyAtAll

-----------------------------------------------------------------------------
-- Accepting the parse

happyAccept j tk st sts (HappyStk ans _) = 

					   (happyReturn1 ans)

-----------------------------------------------------------------------------
-- Arrays only: do the next action



happyDoAction i tk st
	= {- nothing -}


	  case action of
		(0)		  -> {- nothing -}
				     happyFail i tk st
		(-1) 	  -> {- nothing -}
				     happyAccept i tk st
		n | (n < ((0) :: Int)) -> {- nothing -}

				     (happyReduceArr ! rule) i tk st
				     where rule = ((negate ((n + ((1) :: Int)))))
		n		  -> {- nothing -}


				     happyShift new_state i tk st
				     where new_state = (n - ((1) :: Int))
   where off    = indexShortOffAddr happyActOffsets st
	 off_i  = (off + i)
	 check  = if (off_i >= ((0) :: Int))
			then (indexShortOffAddr happyCheck off_i ==  i)
			else False
 	 action | check     = indexShortOffAddr happyTable off_i
		| otherwise = indexShortOffAddr happyDefActions st










{-# LINE 142 "GenericTemplate.hs" #-}

indexShortOffAddr arr off = arr ! off








-----------------------------------------------------------------------------
-- HappyState data type (not arrays)

{-# LINE 165 "GenericTemplate.hs" #-}


-----------------------------------------------------------------------------
-- Shifting a token

happyShift new_state (0) tk st sts stk@(x `HappyStk` _) =
     let i = (case x of { HappyErrorToken (i) -> i }) in
--     trace "shifting the error token" $
     happyDoAction i tk new_state (HappyCons (st) (sts)) (stk)

happyShift new_state i tk st sts stk =
     happyNewToken new_state (HappyCons (st) (sts)) ((HappyTerminal (tk))`HappyStk`stk)

-- happyReduce is specialised for the common cases.

happySpecReduce_0 i fn (0) tk st sts stk
     = happyFail (0) tk st sts stk
happySpecReduce_0 nt fn j tk st@((action)) sts stk
     = happyGoto nt j tk st (HappyCons (st) (sts)) (fn `HappyStk` stk)

happySpecReduce_1 i fn (0) tk st sts stk
     = happyFail (0) tk st sts stk
happySpecReduce_1 nt fn j tk _ sts@((HappyCons (st@(action)) (_))) (v1`HappyStk`stk')
     = let r = fn v1 in
       happySeq r (happyGoto nt j tk st sts (r `HappyStk` stk'))

happySpecReduce_2 i fn (0) tk st sts stk
     = happyFail (0) tk st sts stk
happySpecReduce_2 nt fn j tk _ (HappyCons (_) (sts@((HappyCons (st@(action)) (_))))) (v1`HappyStk`v2`HappyStk`stk')
     = let r = fn v1 v2 in
       happySeq r (happyGoto nt j tk st sts (r `HappyStk` stk'))

happySpecReduce_3 i fn (0) tk st sts stk
     = happyFail (0) tk st sts stk
happySpecReduce_3 nt fn j tk _ (HappyCons (_) ((HappyCons (_) (sts@((HappyCons (st@(action)) (_))))))) (v1`HappyStk`v2`HappyStk`v3`HappyStk`stk')
     = let r = fn v1 v2 v3 in
       happySeq r (happyGoto nt j tk st sts (r `HappyStk` stk'))

happyReduce k i fn (0) tk st sts stk
     = happyFail (0) tk st sts stk
happyReduce k nt fn j tk st sts stk
     = case happyDrop (k - ((1) :: Int)) sts of
	 sts1@((HappyCons (st1@(action)) (_))) ->
        	let r = fn stk in  -- it doesn't hurt to always seq here...
       		happyDoSeq r (happyGoto nt j tk st1 sts1 r)

happyMonadReduce k nt fn (0) tk st sts stk
     = happyFail (0) tk st sts stk
happyMonadReduce k nt fn j tk st sts stk =
        happyThen1 (fn stk) (\r -> happyGoto nt j tk st1 sts1 (r `HappyStk` drop_stk))
       where sts1@((HappyCons (st1@(action)) (_))) = happyDrop k (HappyCons (st) (sts))
             drop_stk = happyDropStk k stk

happyDrop (0) l = l
happyDrop n (HappyCons (_) (t)) = happyDrop (n - ((1) :: Int)) t

happyDropStk (0) l = l
happyDropStk n (x `HappyStk` xs) = happyDropStk (n - ((1)::Int)) xs

-----------------------------------------------------------------------------
-- Moving to a new state after a reduction


happyGoto nt j tk st = 
   {- nothing -}
   happyDoAction j tk new_state
   where off    = indexShortOffAddr happyGotoOffsets st
	 off_i  = (off + nt)
 	 new_state = indexShortOffAddr happyTable off_i




-----------------------------------------------------------------------------
-- Error recovery ((0) is the error token)

-- parse error if we are in recovery and we fail again
happyFail  (0) tk old_st _ stk =
--	trace "failing" $ 
    	happyError


{-  We don't need state discarding for our restricted implementation of
    "error".  In fact, it can cause some bogus parses, so I've disabled it
    for now --SDM

-- discard a state
happyFail  (0) tk old_st (HappyCons ((action)) (sts)) 
						(saved_tok `HappyStk` _ `HappyStk` stk) =
--	trace ("discarding state, depth " ++ show (length stk))  $
	happyDoAction (0) tk action sts ((saved_tok`HappyStk`stk))
-}

-- Enter error recovery: generate an error token,
--                       save the old token and carry on.
happyFail  i tk (action) sts stk =
--      trace "entering error recovery" $
	happyDoAction (0) tk action sts ( (HappyErrorToken (i)) `HappyStk` stk)

-- Internal happy errors:

notHappyAtAll = error "Internal Happy error\n"

-----------------------------------------------------------------------------
-- Hack to get the typechecker to accept our action functions







-----------------------------------------------------------------------------
-- Seq-ing.  If the --strict flag is given, then Happy emits 
--	happySeq = happyDoSeq
-- otherwise it emits
-- 	happySeq = happyDontSeq

happyDoSeq, happyDontSeq :: a -> b -> b
happyDoSeq   a b = a `seq` b
happyDontSeq a b = b

-----------------------------------------------------------------------------
-- Don't inline any functions from the template.  GHC has a nasty habit
-- of deciding to inline happyGoto everywhere, which increases the size of
-- the generated parser quite a bit.


{-# NOINLINE happyDoAction #-}
{-# NOINLINE happyTable #-}
{-# NOINLINE happyCheck #-}
{-# NOINLINE happyActOffsets #-}
{-# NOINLINE happyGotoOffsets #-}
{-# NOINLINE happyDefActions #-}

{-# NOINLINE happyShift #-}
{-# NOINLINE happySpecReduce_0 #-}
{-# NOINLINE happySpecReduce_1 #-}
{-# NOINLINE happySpecReduce_2 #-}
{-# NOINLINE happySpecReduce_3 #-}
{-# NOINLINE happyReduce #-}
{-# NOINLINE happyMonadReduce #-}
{-# NOINLINE happyGoto #-}
{-# NOINLINE happyFail #-}

-- end of Happy Template.