happytemplate-ghc

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 27 "GenericTemplate.hs" #-}










































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 _) = (happyTcHack j 
				                  )
					   (happyReturn1 ans)

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

{-# LINE 150 "GenericTemplate.hs" #-}


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



newtype HappyState b c = HappyState
        (Int# ->                    -- token number
         Int# ->                    -- token number (yes, again)
         b ->                           -- token semantic value
         HappyState b c ->              -- current state
         [HappyState b c] ->            -- state stack
         c)



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

happyShift new_state 1# tk st sts stk@(x `HappyStk` _) =
     let i = (case x of { HappyErrorToken (I# (i)) -> i }) in
--     trace "shifting the error token" $
     new_state i i tk (HappyState (new_state)) ((st):(sts)) (stk)

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

-- happyReduce is specialised for the common cases.

happySpecReduce_0 i fn 1# tk st sts stk
     = happyFail 1# tk st sts stk
happySpecReduce_0 nt fn j tk st@((HappyState (action))) sts stk
     = action nt j tk st ((st):(sts)) (fn `HappyStk` stk)

happySpecReduce_1 i fn 1# tk st sts stk
     = happyFail 1# tk st sts stk
happySpecReduce_1 nt fn j tk _ sts@(((st@(HappyState (action))):(_))) (v1`HappyStk`stk')
     = let r = fn v1 in
       happySeq r (action nt j tk st sts (r `HappyStk` stk'))

happySpecReduce_2 i fn 1# tk st sts stk
     = happyFail 1# tk st sts stk
happySpecReduce_2 nt fn j tk _ ((_):(sts@(((st@(HappyState (action))):(_))))) (v1`HappyStk`v2`HappyStk`stk')
     = let r = fn v1 v2 in
       happySeq r (action nt j tk st sts (r `HappyStk` stk'))

happySpecReduce_3 i fn 1# tk st sts stk
     = happyFail 1# tk st sts stk
happySpecReduce_3 nt fn j tk _ ((_):(((_):(sts@(((st@(HappyState (action))):(_))))))) (v1`HappyStk`v2`HappyStk`v3`HappyStk`stk')
     = let r = fn v1 v2 v3 in
       happySeq r (action nt j tk st sts (r `HappyStk` stk'))

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

happyMonadReduce k nt fn 1# tk st sts stk
     = happyFail 1# tk st sts stk
happyMonadReduce k nt fn j tk st sts stk =
        happyThen1 (fn stk) (\r -> action nt j tk st1 sts1 (r `HappyStk` drop_stk))
       where sts1@(((st1@(HappyState (action))):(_))) = happyDrop k ((st):(sts))
             drop_stk = happyDropStk k stk

happyDrop 0# l = l
happyDrop n ((_):(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 action j tk st = action j j tk (HappyState action)


-----------------------------------------------------------------------------
-- Error recovery (1# is the error token)

-- parse error if we are in recovery and we fail again
happyFail  1# 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  1# tk old_st (((HappyState (action))):(sts)) 
						(saved_tok `HappyStk` _ `HappyStk` stk) =
--	trace ("discarding state, depth " ++ show (length stk))  $
	action 1# 1# tk (HappyState (action)) sts ((saved_tok`HappyStk`stk))
-}

-- Enter error recovery: generate an error token,
--                       save the old token and carry on.
happyFail  i tk (HappyState (action)) sts stk =
--      trace "entering error recovery" $
	action 1# 1# tk (HappyState (action)) sts ( (HappyErrorToken (I# (i))) `HappyStk` stk)

-- Internal happy errors:

notHappyAtAll = error "Internal Happy error\n"

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


happyTcHack :: Int# -> a -> a
happyTcHack x y = y
{-# INLINE happyTcHack #-}


-----------------------------------------------------------------------------
-- 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 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.