{- |

Module : $Header$

Copyright : (c) Christian Maeder and Uni Bremen 2003

License : similar to LGPL, see HetCATS/LICENSE.txt or LIZENZ.txt

Maintainer : maeder@tzi.de

Stability : experimental

Portability : portable

HasCASL's builtin types and functions

-}

module HasCASL.Builtin where

import Common.Id

import Common.Keywords

import Common.GlobalAnnotations

import Common.AS_Annotation

import qualified Common.Lib.Map as Map

import qualified Common.Lib.Set as Set

import qualified Common.Lib.Rel as Rel

import HasCASL.As

import HasCASL.AsUtils

import HasCASL.Le

-- * buitln identifiers

trueId :: Id

trueId = mkId [mkSimpleId trueS]

falseId :: Id

falseId = mkId [mkSimpleId falseS]

ifThenElse :: Id

ifThenElse = mkId (map mkSimpleId [ifS, place, thenS, place, elseS, place])

whenElse :: Id

whenElse = mkId (map mkSimpleId [place, whenS, place, elseS, place])

infixIf :: Id

infixIf = mkInfix ifS

exEq :: Id

exEq = mkInfix exEqual

andId :: Id

andId = mkInfix lAnd

orId :: Id

orId = mkInfix lOr

implId :: Id

implId = mkInfix implS

eqvId :: Id

eqvId = mkInfix equivS

{-

make these prefix identifier to allow "not def x" to be recognized

as "not (def x)" by giving def__ higher precedence then not__.

Simple identifiers usually have higher precedence then ____,

otherwise "def x" would be rejected. But with simple identifiers

"not def x" would be parsed as "(not def) x" because ____ is left

associative.

-}

defId :: Id

defId = mkId [mkSimpleId defS, placeTok]

notId :: Id

notId = mkId [mkSimpleId notS, placeTok]

negId :: Id

negId = mkId [mkSimpleId negS, placeTok]

builtinRelIds :: Set.Set Id

builtinRelIds = Set.fromList [typeId, eqId, exEq, defId]

builtinLogIds :: Set.Set Id

builtinLogIds = Set.fromList

[andId, eqvId, implId, orId, infixIf, notId]

-- | add builtin identifiers

addBuiltins :: GlobalAnnos -> GlobalAnnos

addBuiltins ga =

let ass = assoc_annos ga

newAss = Map.union ass $ Map.fromList

[(applId, ALeft), (andId, ALeft), (orId, ALeft),

(implId, ARight), (infixIf, ALeft),

(whenElse, ARight)]

precs = prec_annos ga

pMap = Rel.toMap precs

opIds = Set.unions (Rel.keysSet pMap : Map.elems pMap)

opIs = Set.toList ((((Set.filter isInfix opIds)

Set.\\ builtinRelIds) Set.\\ builtinLogIds)

Set.\\ Set.fromList [applId, whenElse])

logs = [(eqvId, implId), (implId, andId), (implId, orId),

(eqvId, infixIf), (infixIf, andId), (infixIf, orId),

(andId, notId), (orId, notId),

(andId, negId), (orId, negId)]

rels1 = map ( \ i -> (notId, i)) $ Set.toList builtinRelIds

rels1b = map ( \ i -> (negId, i)) $ Set.toList builtinRelIds

rels2 = map ( \ i -> (i, whenElse)) $ Set.toList builtinRelIds

ops1 = map ( \ i -> (whenElse, i)) (applId : opIs)

ops2 = map ( \ i -> (i, applId)) (whenElse : opIs)

newPrecs = foldr (\ (a, b) p -> if Rel.path b a p then p else

Rel.insert a b p) precs $

concat [logs, rels1, rels1b, rels2, ops1, ops2]

in ga { assoc_annos = newAss

, prec_annos = Rel.transClosure newPrecs }

aVar :: Id

aVar = simpleIdToId $ mkSimpleId "a"

aTypeWithKind :: Kind -> Type

aTypeWithKind k = TypeName aVar (toRaw k) (-1)

aType :: Type

aType = aTypeWithKind universe

aBindWithKind :: Variance -> Kind -> Type -> TypeScheme

aBindWithKind v k ty = TypeScheme [TypeArg aVar v (VarKind k)

(toRaw k) (-1) Other nullRange] ty nullRange

bindA :: Type -> TypeScheme

bindA = aBindWithKind InVar universe

lazyLog :: Type

lazyLog = mkLazyType unitType

aToUnitType :: Variance -> Kind -> TypeScheme

aToUnitType v k =

aBindWithKind v k $ mkFunArrType (aTypeWithKind k) PFunArr unitType

eqType, logType, notType, whenType, unitTypeScheme :: TypeScheme

eqType = bindA $ mkFunArrType (mkProductType [aType, aType]) PFunArr unitType

logType = simpleTypeScheme $

mkFunArrType (mkProductType [lazyLog, lazyLog]) PFunArr unitType

notType = simpleTypeScheme $ mkFunArrType lazyLog PFunArr unitType

whenType =

bindA $ mkFunArrType (mkProductType [aType, lazyLog, aType]) PFunArr aType

unitTypeScheme = simpleTypeScheme unitType

botId :: Id

botId = mkId [mkSimpleId "bottom"]

predTypeId :: Id

predTypeId = mkId [mkSimpleId "Pred"]

logId :: Id

logId = mkId [mkSimpleId "Logical"]

botType :: TypeScheme

botType = bindA aType

defType :: TypeScheme

defType = aToUnitType InVar universe

bList :: [(Id, TypeScheme)]

bList = (botId, botType) : (defId, defType) : (notId, notType) :

(negId, notType) : (whenElse, whenType) :

(trueId, unitTypeScheme) : (falseId, unitTypeScheme) :

(eqId, eqType) : (exEq, eqType) :

map ( \ o -> (o, logType)) [andId, orId, eqvId, implId, infixIf]

funSupertypes :: [(Arrow, [Arrow])]

funSupertypes = [(PFunArr,[]), (FunArr, [PFunArr]), (PContFunArr, [PFunArr]),

(ContFunArr, [PContFunArr, FunArr])]

addUnit :: TypeMap -> TypeMap

addUnit tm = foldr ( \ (i, k, s, d) m ->

Map.insertWith ( \ _ old -> old) i

(TypeInfo (toRaw k) [k] (Set.fromList s) d) m) tm $

(unitTypeId, universe, [], NoTypeDefn)

: (predTypeId, FunKind ContraVar universe universe nullRange, [],

AliasTypeDefn $ aToUnitType ContraVar universe)

: (lazyTypeId, lazyKind, [], NoTypeDefn)

: (logId, universe, [], AliasTypeDefn $ simpleTypeScheme $

mkLazyType unitType)

: map ( \ n -> (productId n , prodKind n, [], NoTypeDefn))

[2 .. 5]

++ map ( \ (a, l) -> (arrowId a, funKind,

map ( \ b -> arrowId b) l,

NoTypeDefn))

funSupertypes

addOps :: Assumps -> Assumps

addOps as = foldr ( \ (i, sc) m ->

Map.insertWith ( \ _ old -> old) i

(OpInfos [OpInfo sc [] (NoOpDefn Fun)]) m) as bList

mkQualOp :: Id -> TypeScheme -> Range -> Term

mkQualOp i sc ps = QualOp Fun (InstOpId i [] ps) sc ps

mkTerm :: Id -> TypeScheme -> Range -> Term -> Term

mkTerm i sc ps t = ApplTerm (mkQualOp i sc ps) t ps

mkBinTerm :: Id -> TypeScheme -> Range -> Term -> Term -> Term

mkBinTerm i sc ps t1 t2 = mkTerm i sc ps $ TupleTerm [t1, t2] ps

mkLogTerm :: Id -> Range -> Term -> Term -> Term

mkLogTerm i ps = mkBinTerm i logType ps

mkEqTerm :: Id -> Range -> Term -> Term -> Term

mkEqTerm i ps = mkBinTerm i eqType ps

unitTerm :: Id -> Range -> Term

unitTerm i ps = mkQualOp i unitTypeScheme ps

toBinJunctor :: Id -> [Term] -> Range -> Term

toBinJunctor i ts ps = case ts of

[] -> error "toBinJunctor"

[t] -> t

t:rs -> mkLogTerm i ps t

(toBinJunctor i rs ps)