forked from GitHub/gf-core
in the middle of adapting CheckGrammar
This commit is contained in:
aarne
163
src/GF/Devel/Grammar/AppPredefined.hs
Normal file
163
src/GF/Devel/Grammar/AppPredefined.hs
Normal file
@@ -0,0 +1,163 @@
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----------------------------------------------------------------------
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-- |
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-- Module : AppPredefined
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-- Maintainer : AR
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/10/06 14:21:34 $
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-- > CVS $Author: aarne $
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-- > CVS $Revision: 1.13 $
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--
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-- Predefined function type signatures and definitions.
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-----------------------------------------------------------------------------
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module GF.Devel.Grammar.AppPredefined (
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isInPredefined,
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typPredefined,
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appPredefined
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) where
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import GF.Devel.Grammar.Terms
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import GF.Devel.Grammar.Macros
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import GF.Grammar.PrGF (prt,prt_,prtBad)
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import GF.Infra.Ident
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import GF.Data.Operations
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-- predefined function type signatures and definitions. AR 12/3/2003.
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isInPredefined :: Ident -> Bool
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isInPredefined = err (const True) (const False) . typPredefined
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typPredefined :: Ident -> Err Type
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typPredefined c@(IC f) = case f of
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"Int" -> return typePType
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"Float" -> return typePType
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"Error" -> return typeType
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"Ints" -> return $ mkFunType [cnPredef "Int"] typePType
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"PBool" -> return typePType
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"error" -> return $ mkFunType [typeStr] (cnPredef "Error") -- non-can. of empty set
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"PFalse" -> return $ cnPredef "PBool"
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"PTrue" -> return $ cnPredef "PBool"
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"dp" -> return $ mkFunType [cnPredef "Int",typeTok] typeTok
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"drop" -> return $ mkFunType [cnPredef "Int",typeTok] typeTok
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"eqInt" -> return $ mkFunType [cnPredef "Int",cnPredef "Int"] (cnPredef "PBool")
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"lessInt"-> return $ mkFunType [cnPredef "Int",cnPredef "Int"] (cnPredef "PBool")
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"eqStr" -> return $ mkFunType [typeTok,typeTok] (cnPredef "PBool")
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"length" -> return $ mkFunType [typeTok] (cnPredef "Int")
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"occur" -> return $ mkFunType [typeTok,typeTok] (cnPredef "PBool")
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"occurs" -> return $ mkFunType [typeTok,typeTok] (cnPredef "PBool")
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"plus" -> return $ mkFunType [cnPredef "Int",cnPredef "Int"] (cnPredef "Int")
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---- "read" -> (P : Type) -> Tok -> P
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"show" -> return $ mkProd -- (P : PType) -> P -> Tok
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([(zIdent "P",typePType),(wildIdent,Vr (zIdent "P"))],typeStr,[])
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"toStr" -> return $ mkProd -- (L : Type) -> L -> Str
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([(zIdent "L",typeType),(wildIdent,Vr (zIdent "L"))],typeStr,[])
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"mapStr" ->
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let ty = zIdent "L" in
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return $ mkProd -- (L : Type) -> (Str -> Str) -> L -> L
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([(ty,typeType),(wildIdent,mkFunType [typeStr] typeStr),(wildIdent,Vr ty)],Vr ty,[])
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"take" -> return $ mkFunType [cnPredef "Int",typeTok] typeTok
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"tk" -> return $ mkFunType [cnPredef "Int",typeTok] typeTok
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_ -> prtBad "unknown in Predef:" c
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typPredefined c = prtBad "unknown in Predef:" c
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appPredefined :: Term -> Err (Term,Bool)
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appPredefined t = case t of
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App f x0 -> do
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(x,_) <- appPredefined x0
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case f of
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-- one-place functions
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Q (IC "Predef") (IC f) -> case (f, x) of
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("length", K s) -> retb $ EInt $ toInteger $ length s
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_ -> retb t ---- prtBad "cannot compute predefined" t
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-- two-place functions
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App (Q (IC "Predef") (IC f)) z0 -> do
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(z,_) <- appPredefined z0
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case (f, norm z, norm x) of
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("drop", EInt i, K s) -> retb $ K (drop (fi i) s)
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("take", EInt i, K s) -> retb $ K (take (fi i) s)
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("tk", EInt i, K s) -> retb $ K (take (max 0 (length s - fi i)) s)
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("dp", EInt i, K s) -> retb $ K (drop (max 0 (length s - fi i)) s)
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("eqStr",K s, K t) -> retb $ if s == t then predefTrue else predefFalse
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("occur",K s, K t) -> retb $ if substring s t then predefTrue else predefFalse
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("occurs",K s, K t) -> retb $ if any (flip elem t) s then predefTrue else predefFalse
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("eqInt",EInt i, EInt j) -> retb $ if i==j then predefTrue else predefFalse
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("lessInt",EInt i, EInt j) -> retb $ if i<j then predefTrue else predefFalse
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("plus", EInt i, EInt j) -> retb $ EInt $ i+j
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("show", _, t) -> retb $ foldr C Empty $ map K $ words $ prt t
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("read", _, K s) -> retb $ str2tag s --- because of K, only works for atomic tags
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("toStr", _, t) -> trm2str t >>= retb
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_ -> retb t ---- prtBad "cannot compute predefined" t
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-- three-place functions
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App (App (Q (IC "Predef") (IC f)) z0) y0 -> do
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(y,_) <- appPredefined y0
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(z,_) <- appPredefined z0
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case (f, z, y, x) of
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("mapStr",ty,op,t) -> retf $ mapStr ty op t
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_ -> retb t ---- prtBad "cannot compute predefined" t
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_ -> retb t ---- prtBad "cannot compute predefined" t
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_ -> retb t
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---- should really check the absence of arg variables
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where
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retb t = return (t,True) -- no further computing needed
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retf t = return (t,False) -- must be computed further
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norm t = case t of
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Empty -> K []
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_ -> t
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fi = fromInteger
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-- read makes variables into constants
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str2tag :: String -> Term
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str2tag s = case s of
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---- '\'' : cs -> mkCn $ pTrm $ init cs
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_ -> Cn $ IC s ---
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where
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mkCn t = case t of
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Vr i -> Cn i
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App c a -> App (mkCn c) (mkCn a)
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_ -> t
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predefTrue = Q (IC "Predef") (IC "PTrue")
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predefFalse = Q (IC "Predef") (IC "PFalse")
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substring :: String -> String -> Bool
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substring s t = case (s,t) of
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(c:cs, d:ds) -> (c == d && substring cs ds) || substring s ds
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([],_) -> True
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_ -> False
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trm2str :: Term -> Err Term
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trm2str t = case t of
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R ((_,(_,s)):_) -> trm2str s
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T _ ((_,s):_) -> trm2str s
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TSh _ ((_,s):_) -> trm2str s
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V _ (s:_) -> trm2str s
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C _ _ -> return $ t
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K _ -> return $ t
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S c _ -> trm2str c
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Empty -> return $ t
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_ -> prtBad "cannot get Str from term" t
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-- simultaneous recursion on type and term: type arg is essential!
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-- But simplify the task by assuming records are type-annotated
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-- (this has been done in type checking)
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mapStr :: Type -> Term -> Term -> Term
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mapStr ty f t = case (ty,t) of
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_ | elem ty [typeStr,typeTok] -> App f t
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(_, R ts) -> R [(l,mapField v) | (l,v) <- ts]
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(Table a b,T ti cs) -> T ti [(p,mapStr b f v) | (p,v) <- cs]
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_ -> t
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where
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mapField (mty,te) = case mty of
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Just ty -> (mty,mapStr ty f te)
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_ -> (mty,te)
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@@ -4,11 +4,13 @@ import GF.Devel.Grammar.Modules
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import GF.Devel.Grammar.Judgements
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import GF.Devel.Grammar.Macros
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import GF.Devel.Grammar.Terms
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import GF.Devel.Grammar.PrGF
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import GF.Infra.Ident
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import GF.Data.Operations
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import Data.Map
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import Data.List (sortBy) ----
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-- look up fields for a constant in a grammar
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@@ -57,6 +59,22 @@ lookupParamValues gf m c = do
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V _ ts -> return ts
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_ -> raise "no parameter values"
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allParamValues :: GF -> Type -> Err [Term]
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allParamValues cnc ptyp = case ptyp of
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App (Q (IC "Predef") (IC "Ints")) (EInt n) ->
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return [EInt i | i <- [0..n]]
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QC p c -> lookupParamValues cnc p c
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Q p c -> lookupParamValues cnc p c ----
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RecType r -> do
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let (ls,tys) = unzip $ sortByFst r
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tss <- mapM allPV tys
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return [R (zipAssign ls ts) | ts <- combinations tss]
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_ -> prtBad "cannot find parameter values for" ptyp
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where
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allPV = allParamValues cnc
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-- to normalize records and record types
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sortByFst = sortBy (\ x y -> compare (fst x) (fst y))
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-- infrastructure for lookup
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lookupModule :: GF -> Ident -> Err Module
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@@ -7,9 +7,12 @@ import GF.Infra.Ident
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import GF.Data.Operations
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import Data.Map
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import qualified Data.Map as Map
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import Control.Monad (liftM,liftM2)
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-- analyse types and terms
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contextOfType :: Type -> Context
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contextOfType ty = co where (co,_,_) = typeForm ty
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@@ -30,9 +33,48 @@ appForm tr = (f,reverse xs) where
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App f a -> (f2,a:a2) where (f2,a2) = appForm f
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_ -> (t,[])
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valCat :: Type -> Err (Ident,Ident)
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valCat typ = case typeForm typ of
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(_,Q m c,_) -> return (m,c)
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typeRawSkeleton :: Type -> Err ([(Int,Type)],Type)
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typeRawSkeleton typ = do
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let (cont,typ) = prodForm typ
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args <- mapM (typeRawSkeleton . snd) cont
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return ([(length c, v) | (c,v) <- args], typ)
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type MCat = (Ident,Ident)
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sortMCat :: String -> MCat
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sortMCat s = (identC "_", identC s)
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--- hack for Editing.actCat in empty state
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errorCat :: MCat
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errorCat = (identC "?", identC "?")
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getMCat :: Term -> Err MCat
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getMCat t = case t of
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Q m c -> return (m,c)
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QC m c -> return (m,c)
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Sort s -> return $ sortMCat s
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App f _ -> getMCat f
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_ -> error $ "no qualified constant" +++ show t
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typeSkeleton :: Type -> Err ([(Int,MCat)],MCat)
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typeSkeleton typ = do
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(cont,val) <- typeRawSkeleton typ
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cont' <- mapPairsM getMCat cont
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val' <- getMCat val
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return (cont',val')
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-- construct types and terms
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mkProd :: Context -> Type -> Type
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mkProd = flip (foldr (uncurry Prod))
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mkFunType :: [Type] -> Type -> Type
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mkFunType tt t = mkProd ([(wildIdent, ty) | ty <- tt]) t -- nondep prod
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mkApp :: Term -> [Term] -> Term
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mkApp = foldl App
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@@ -43,6 +85,12 @@ mkCTable :: [Ident] -> Term -> Term
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mkCTable ids v = foldr ccase v ids where
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ccase x t = T TRaw [(PV x,t)]
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appCons :: Ident -> [Term] -> Term
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appCons = mkApp . Con
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appc :: String -> [Term] -> Term
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appc = appCons . identC
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tuple2record :: [Term] -> [Assign]
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tuple2record ts = [assign (tupleLabel i) t | (i,t) <- zip [1..] ts]
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@@ -67,9 +115,74 @@ mkDecl typ = (wildIdent, typ)
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mkLet :: [LocalDef] -> Term -> Term
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mkLet defs t = foldr Let t defs
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mkRecTypeN :: Int -> (Int -> Label) -> [Type] -> Type
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mkRecTypeN int lab typs = RecType [ (lab i, t) | (i,t) <- zip [int..] typs]
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mkRecType :: (Int -> Label) -> [Type] -> Type
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mkRecType = mkRecTypeN 0
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plusRecType :: Type -> Type -> Err Type
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plusRecType t1 t2 = case (t1, t2) of
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(RecType r1, RecType r2) -> case
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filter (`elem` (map fst r1)) (map fst r2) of
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[] -> return (RecType (r1 ++ r2))
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ls -> Bad $ "clashing labels" +++ unwords (map show ls)
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_ -> Bad ("cannot add record types" +++ show t1 +++ "and" +++ show t2)
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plusRecord :: Term -> Term -> Err Term
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plusRecord t1 t2 =
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case (t1,t2) of
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(R r1, R r2 ) -> return (R ([(l,v) | -- overshadowing of old fields
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(l,v) <- r1, not (elem l (map fst r2)) ] ++ r2))
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(_, FV rs) -> mapM (plusRecord t1) rs >>= return . FV
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(FV rs,_ ) -> mapM (`plusRecord` t2) rs >>= return . FV
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_ -> Bad ("cannot add records" +++ show t1 +++ "and" +++ show t2)
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zipAssign :: [Label] -> [Term] -> [Assign]
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zipAssign ls ts = [assign l t | (l,t) <- zip ls ts]
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-- type constants
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typeType :: Type
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typeType = Sort "Type"
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typePType :: Type
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typePType = Sort "PType"
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typeStr :: Type
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typeStr = Sort "Str"
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cPredef :: Ident
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cPredef = identC "Predef"
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cPredefAbs :: Ident
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cPredefAbs = identC "PredefAbs"
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typeString, typeFloat, typeInt :: Term
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typeInts :: Integer -> Term
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typeString = constPredefRes "String"
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typeInt = constPredefRes "Int"
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typeFloat = constPredefRes "Float"
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typeInts i = App (constPredefRes "Ints") (EInt i)
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isTypeInts :: Term -> Bool
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isTypeInts ty = case ty of
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App c _ -> c == constPredefRes "Ints"
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_ -> False
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constPredefRes :: String -> Term
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constPredefRes s = Q (IC "Predef") (identC s)
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isPredefConstant :: Term -> Bool
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isPredefConstant t = case t of
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Q (IC "Predef") _ -> True
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Q (IC "PredefAbs") _ -> True
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_ -> False
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defLinType :: Type
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defLinType = RecType [(LIdent "s", typeStr)]
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meta0 :: Term
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meta0 = Meta 0
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@@ -93,12 +206,14 @@ termOpGF f g = do
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termOpModule :: Monad m => (Term -> m Term) -> Module -> m Module
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termOpModule f = judgementOpModule fj where
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fj = either (liftM Left . termOpJudgement f) (return . Right)
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fj = termOpJudgement f
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judgementOpModule :: Monad m => (Judgement -> m Judgement) -> Module -> m Module
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judgementOpModule f m = do
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mjs <- mapMapM f (mjments m)
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mjs <- mapMapM fj (mjments m)
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return m {mjments = mjs}
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where
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fj = either (liftM Left . f) (return . Right)
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termOpJudgement :: Monad m => (Term -> m Term) -> Judgement -> m Judgement
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termOpJudgement f j = do
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@@ -194,6 +309,28 @@ composOp co trm = case trm of
|
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_ -> return trm -- covers K, Vr, Cn, Sort
|
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---- should redefine using composOp
|
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collectOp :: (Term -> [a]) -> Term -> [a]
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collectOp co trm = case trm of
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App c a -> co c ++ co a
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Abs _ b -> co b
|
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Prod _ a b -> co a ++ co b
|
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S c a -> co c ++ co a
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Table a c -> co a ++ co c
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ExtR a c -> co a ++ co c
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R r -> concatMap (\ (_,(mt,a)) -> maybe [] co mt ++ co a) r
|
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RecType r -> concatMap (co . snd) r
|
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P t i -> co t
|
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T _ cc -> concatMap (co . snd) cc -- not from patterns --- nor from type annot
|
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V _ cc -> concatMap co cc --- nor from type annot
|
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Let (x,(mt,a)) b -> maybe [] co mt ++ co a ++ co b
|
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C s1 s2 -> co s1 ++ co s2
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Glue s1 s2 -> co s1 ++ co s2
|
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Alts (t,aa) -> let (x,y) = unzip aa in co t ++ concatMap co (x ++ y)
|
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FV ts -> concatMap co ts
|
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_ -> [] -- covers K, Vr, Cn, Sort, Ready
|
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|
||||
--- just aux to composOp?
|
||||
|
||||
mapAssignM :: Monad m => (Term -> m c) -> [Assign] -> m [(Label,(Maybe c,c))]
|
||||
@@ -207,9 +344,29 @@ changeTableType co i = case i of
|
||||
TWild ty -> co ty >>= return . TWild
|
||||
_ -> return i
|
||||
|
||||
|
||||
patt2term :: Patt -> Term
|
||||
patt2term pt = case pt of
|
||||
PV x -> Vr x
|
||||
PW -> Vr wildIdent --- not parsable, should not occur
|
||||
PC c pp -> mkApp (Con c) (map patt2term pp)
|
||||
PP p c pp -> mkApp (QC p c) (map patt2term pp)
|
||||
PR r -> R [assign l (patt2term p) | (l,p) <- r]
|
||||
PT _ p -> patt2term p
|
||||
PInt i -> EInt i
|
||||
PFloat i -> EFloat i
|
||||
PString s -> K s
|
||||
|
||||
PAs x p -> appc "@" [Vr x, patt2term p] --- an encoding
|
||||
PSeq a b -> appc "+" [(patt2term a), (patt2term b)] --- an encoding
|
||||
PAlt a b -> appc "|" [(patt2term a), (patt2term b)] --- an encoding
|
||||
PRep a -> appc "*" [(patt2term a)] --- an encoding
|
||||
PNeg a -> appc "-" [(patt2term a)] --- an encoding
|
||||
|
||||
|
||||
---- given in lib?
|
||||
|
||||
mapMapM :: (Monad m, Ord k) => (v -> m v) -> Map k v -> m (Map k v)
|
||||
mapMapM :: (Monad m, Ord k) => (v -> m v) -> Map.Map k v -> m (Map.Map k v)
|
||||
mapMapM f =
|
||||
liftM fromAscList . mapM (\ (x,y) -> liftM ((,) x) $ f y) . assocs
|
||||
liftM Map.fromAscList . mapM (\ (x,y) -> liftM ((,) x) $ f y) . Map.assocs
|
||||
|
||||
|
||||
153
src/GF/Devel/Grammar/PatternMatch.hs
Normal file
153
src/GF/Devel/Grammar/PatternMatch.hs
Normal file
@@ -0,0 +1,153 @@
|
||||
----------------------------------------------------------------------
|
||||
-- |
|
||||
-- Module : PatternMatch
|
||||
-- Maintainer : AR
|
||||
-- Stability : (stable)
|
||||
-- Portability : (portable)
|
||||
--
|
||||
-- > CVS $Date: 2005/10/12 12:38:29 $
|
||||
-- > CVS $Author: aarne $
|
||||
-- > CVS $Revision: 1.7 $
|
||||
--
|
||||
-- pattern matching for both concrete and abstract syntax. AR -- 16\/6\/2003
|
||||
-----------------------------------------------------------------------------
|
||||
|
||||
module GF.Devel.Grammar.PatternMatch (matchPattern,
|
||||
testOvershadow,
|
||||
findMatch
|
||||
) where
|
||||
|
||||
|
||||
import GF.Grammar.Terms
|
||||
import GF.Grammar.Macros
|
||||
import GF.Grammar.PrGF
|
||||
import GF.Infra.Ident
|
||||
|
||||
import GF.Data.Operations
|
||||
|
||||
import Data.List
|
||||
import Control.Monad
|
||||
|
||||
|
||||
matchPattern :: [(Patt,Term)] -> Term -> Err (Term, Substitution)
|
||||
matchPattern pts term =
|
||||
if not (isInConstantForm term)
|
||||
then prtBad "variables occur in" term
|
||||
else
|
||||
errIn ("trying patterns" +++ unwords (intersperse "," (map (prt . fst) pts))) $
|
||||
findMatch [([p],t) | (p,t) <- pts] [term]
|
||||
|
||||
testOvershadow :: [Patt] -> [Term] -> Err [Patt]
|
||||
testOvershadow pts vs = do
|
||||
let numpts = zip pts [0..]
|
||||
let cases = [(p,EInt i) | (p,i) <- numpts]
|
||||
ts <- mapM (liftM fst . matchPattern cases) vs
|
||||
return $ [p | (p,i) <- numpts, notElem i [i | EInt i <- ts] ]
|
||||
|
||||
findMatch :: [([Patt],Term)] -> [Term] -> Err (Term, Substitution)
|
||||
findMatch cases terms = case cases of
|
||||
[] -> Bad $"no applicable case for" +++ unwords (intersperse "," (map prt terms))
|
||||
(patts,_):_ | length patts /= length terms ->
|
||||
Bad ("wrong number of args for patterns :" +++
|
||||
unwords (map prt patts) +++ "cannot take" +++ unwords (map prt terms))
|
||||
(patts,val):cc -> case mapM tryMatch (zip patts terms) of
|
||||
Ok substs -> return (val, concat substs)
|
||||
_ -> findMatch cc terms
|
||||
|
||||
tryMatch :: (Patt, Term) -> Err [(Ident, Term)]
|
||||
tryMatch (p,t) = do
|
||||
t' <- termForm t
|
||||
trym p t'
|
||||
where
|
||||
isInConstantFormt = True -- tested already
|
||||
trym p t' =
|
||||
case (p,t') of
|
||||
(PVal _ i, (_,Val _ j,_))
|
||||
| i == j -> return []
|
||||
| otherwise -> Bad $ "no match of values"
|
||||
(_,(x,Empty,y)) -> trym p (x,K [],y) -- because "" = [""] = []
|
||||
(PV IW, _) | isInConstantFormt -> return [] -- optimization with wildcard
|
||||
(PV x, _) | isInConstantFormt -> return [(x,t)]
|
||||
(PString s, ([],K i,[])) | s==i -> return []
|
||||
(PInt s, ([],EInt i,[])) | s==i -> return []
|
||||
(PFloat s,([],EFloat i,[])) | s==i -> return [] --- rounding?
|
||||
(PC p pp, ([], Con f, tt)) |
|
||||
p `eqStrIdent` f && length pp == length tt ->
|
||||
do matches <- mapM tryMatch (zip pp tt)
|
||||
return (concat matches)
|
||||
|
||||
(PP q p pp, ([], QC r f, tt)) |
|
||||
-- q `eqStrIdent` r && --- not for inherited AR 10/10/2005
|
||||
p `eqStrIdent` f && length pp == length tt ->
|
||||
do matches <- mapM tryMatch (zip pp tt)
|
||||
return (concat matches)
|
||||
---- hack for AppPredef bug
|
||||
(PP q p pp, ([], Q r f, tt)) |
|
||||
-- q `eqStrIdent` r && ---
|
||||
p `eqStrIdent` f && length pp == length tt ->
|
||||
do matches <- mapM tryMatch (zip pp tt)
|
||||
return (concat matches)
|
||||
|
||||
(PR r, ([],R r',[])) |
|
||||
all (`elem` map fst r') (map fst r) ->
|
||||
do matches <- mapM tryMatch
|
||||
[(p,snd a) | (l,p) <- r, let Just a = lookup l r']
|
||||
return (concat matches)
|
||||
(PT _ p',_) -> trym p' t'
|
||||
(_, ([],Alias _ _ d,[])) -> tryMatch (p,d)
|
||||
|
||||
-- (PP (IC "Predef") (IC "CC") [p1,p2], ([],K s, [])) -> do
|
||||
|
||||
(PAs x p',_) -> do
|
||||
subst <- trym p' t'
|
||||
return $ (x,t) : subst
|
||||
|
||||
(PAlt p1 p2,_) -> checks [trym p1 t', trym p2 t']
|
||||
|
||||
(PNeg p',_) -> case tryMatch (p',t) of
|
||||
Bad _ -> return []
|
||||
_ -> prtBad "no match with negative pattern" p
|
||||
|
||||
(PSeq p1 p2, ([],K s, [])) -> do
|
||||
let cuts = [splitAt n s | n <- [0 .. length s]]
|
||||
matches <- checks [mapM tryMatch [(p1,K s1),(p2,K s2)] | (s1,s2) <- cuts]
|
||||
return (concat matches)
|
||||
|
||||
(PRep p1, ([],K s, [])) -> checks [
|
||||
trym (foldr (const (PSeq p1)) (PString "")
|
||||
[1..n]) t' | n <- [0 .. length s]
|
||||
] >>
|
||||
return []
|
||||
_ -> prtBad "no match in case expr for" t
|
||||
|
||||
isInConstantForm :: Term -> Bool
|
||||
isInConstantForm trm = case trm of
|
||||
Cn _ -> True
|
||||
Con _ -> True
|
||||
Q _ _ -> True
|
||||
QC _ _ -> True
|
||||
Abs _ _ -> True
|
||||
App c a -> isInConstantForm c && isInConstantForm a
|
||||
R r -> all (isInConstantForm . snd . snd) r
|
||||
K _ -> True
|
||||
Empty -> True
|
||||
Alias _ _ t -> isInConstantForm t
|
||||
EInt _ -> True
|
||||
_ -> False ---- isInArgVarForm trm
|
||||
|
||||
varsOfPatt :: Patt -> [Ident]
|
||||
varsOfPatt p = case p of
|
||||
PV x -> [x | not (isWildIdent x)]
|
||||
PC _ ps -> concat $ map varsOfPatt ps
|
||||
PP _ _ ps -> concat $ map varsOfPatt ps
|
||||
PR r -> concat $ map (varsOfPatt . snd) r
|
||||
PT _ q -> varsOfPatt q
|
||||
_ -> []
|
||||
|
||||
-- | to search matching parameter combinations in tables
|
||||
isMatchingForms :: [Patt] -> [Term] -> Bool
|
||||
isMatchingForms ps ts = all match (zip ps ts') where
|
||||
match (PC c cs, (Cn d, ds)) = c == d && isMatchingForms cs ds
|
||||
match _ = True
|
||||
ts' = map appForm ts
|
||||
|
||||
Reference in New Issue
Block a user