{- |

Module : $Header$

Copyright : (c) Christian Maeder and Uni Bremen 2003

Licence : similar to LGPL, see HetCATS/LICENCE.txt or LIZENZ.txt

Maintainer : hets@tzi.de

Stability : experimental

Portability : portable

abstract syntax for HasCASL,

more liberal than Concrete-Syntax.txt,

annotations are almost as for CASL

-}

module HasCASL.As where

import Common.Id

import Common.Keywords

import Common.AS_Annotation

import HasCASL.HToken

-- * abstract syntax entities

data BasicSpec = BasicSpec [Annoted BasicItem]

deriving (Show, Eq)

data BasicItem = SigItems SigItems

| ProgItems [Annoted ProgEq] [Pos]

-- pos "program", dots

| ClassItems Instance [Annoted ClassItem] [Pos]

-- pos "class", ";"s

| GenVarItems [GenVarDecl] [Pos]

-- pos "var", ";"s

| FreeDatatype [Annoted DatatypeDecl] [Pos]

-- pos "free", "type", ";"s

| GenItems [Annoted SigItems] [Pos]

-- pos "generated" "{", ";"s, "}"

-- or "generated" "type" ";"s

| AxiomItems [GenVarDecl] [Annoted Term] [Pos]

-- pos "forall" (if GenVarDecl not empty), dots

| Internal [Annoted BasicItem] [Pos]

-- pos "internal" "{", ";"s, "}"

deriving (Show, Eq)

data SigItems = TypeItems Instance [Annoted TypeItem] [Pos] -- including sort

-- pos "type", ";"s

| OpItems OpBrand [Annoted OpItem] [Pos]

-- pos "op", ";"s

deriving (Show, Eq)

-- | indicator for predicate, operation or function

data OpBrand = Pred | Op | Fun deriving (Eq, Ord)

instance Show OpBrand where

show b = case b of

Pred -> predS

Op -> opS

Fun -> functS

isPred :: OpBrand -> Bool

isPred b = case b of Pred -> True

_ -> False

-- | indicator in 'ClassItems' and 'TypeItems'

data Instance = Instance | Plain deriving Eq

instance Show Instance where

show i = case i of

Instance -> instanceS

Plain -> ""

data ClassItem = ClassItem ClassDecl [Annoted BasicItem] [Pos]

-- pos "{", ";"s "}"

deriving (Show, Eq)

data ClassDecl = ClassDecl [ClassId] Kind [Pos]

-- pos ","s

deriving (Show, Eq)

data Variance = CoVar | ContraVar deriving (Eq, Ord)

instance Show Variance where

show v = case v of

CoVar -> plusS

ContraVar -> minusS

-- | kind or an extended kind

data Kind = MissingKind -- ^ initially missing information

| Downset (Maybe Token) Type Kind [Pos] -- ^ plus the derived kind

| ClassKind ClassId Kind -- ^ plus the declared kind

| Intersection [Kind] [Pos] -- ^ with equal raw kinds

| FunKind Kind Kind [Pos] -- ^ only argument may be an 'ExtKind'

-- pos "->"

| ExtKind Kind Variance [Pos] -- ^ no 'InVar'

-- pos "+" or "-"

deriving Show

-- | the type universe

star :: Kind

star = Intersection [] []

-- | the 'ExtKind' 'star' 'CoVar' (Type+)

starPlus :: Kind

starPlus = ExtKind star CoVar []

-- | the 'Kind' of the function type

funKind :: Kind

funKind = FunKind (ExtKind star ContraVar [])

(FunKind starPlus star []) []

-- | the 'Kind' of the pair product type

prodKind :: Kind

prodKind = FunKind starPlus (FunKind starPlus star []) []

data TypeItem = TypeDecl [TypePattern] Kind [Pos]

-- pos ","s

| SubtypeDecl [TypePattern] Type [Pos]

-- pos ","s, "<"

| IsoDecl [TypePattern] [Pos]

-- pos "="s

| SubtypeDefn TypePattern Vars Type (Annoted Term) [Pos]

-- pos "=", "{", ":", dot, "}"

| AliasType TypePattern (Maybe Kind) TypeScheme [Pos]

-- pos ":="

| Datatype DatatypeDecl

deriving (Show, Eq)

-- | a tuple pattern for 'SubtypeDefn'

data Vars = Var Var | VarTuple [Vars] [Pos] deriving Show

data TypePattern = TypePattern TypeId [TypeArg] [Pos]

-- pos "("s, ")"s

| TypePatternToken Token

| MixfixTypePattern [TypePattern]

| BracketTypePattern BracketKind [TypePattern] [Pos]

-- pos brackets (no parenthesis)

| TypePatternArg TypeArg [Pos]

-- pos "(", ")"

deriving (Show, Eq)

data Type = TypeName TypeId Kind Int -- (Int == 0 means constructor,

-- negative are bound variables)

| TypeAppl Type Type

| ExpandedType Type Type

| TypeToken Token

| BracketType BracketKind [Type] [Pos]

-- pos "," (between type arguments)

| KindedType Type Kind [Pos]

-- pos ":"

| MixfixType [Type]

| LazyType Type [Pos]

-- pos "?"

| ProductType [Type] [Pos]

-- pos crosses

| FunType Type Arrow Type [Pos]

-- pos arrow

deriving Show

unalias :: Type -> Type

unalias ty = case ty of

ExpandedType _ t -> unalias t

_ -> ty

mkProductType :: [Type] -> [Pos] -> Type

mkProductType ts ps = if isSingle ts then head ts else ProductType ts ps

data Arrow = FunArr| PFunArr | ContFunArr | PContFunArr

deriving (Eq, Ord)

instance Show Arrow where

show a = case a of

FunArr -> funS

PFunArr -> pFun

ContFunArr -> contFun

PContFunArr -> pContFun

arrowId :: Arrow -> Id

arrowId a = Id (map mkSimpleId [place, show a, place]) [] []

productId :: Id

productId = Id (map mkSimpleId [place, prodS, place]) [] []

-- no curried notation for bound variables

data TypeScheme = TypeScheme [TypeArg] Type [Pos]

-- pos "forall", ";"s, dot (singleton list)

-- pos "\" "("s, ")"s, dot for type aliases

deriving Show

simpleTypeScheme :: Type -> TypeScheme

simpleTypeScheme t = TypeScheme [] t []

unitTypeId :: Id

unitTypeId = simpleIdToId $ mkSimpleId "Unit"

logicalType :: Type

logicalType = TypeName unitTypeId star 0

-- ProductType [] []

mapTypeOfScheme :: (Type -> Type) -> TypeScheme -> TypeScheme

mapTypeOfScheme f (TypeScheme args t ps) =

TypeScheme args (f t) ps

predTypeScheme :: TypeScheme -> TypeScheme

predTypeScheme = mapTypeOfScheme predType

predType :: Type -> Type

predType t = case t of

BracketType Parens [] _ -> logicalType

_ -> FunType t PFunArr logicalType []

data Partiality = Partial | Total deriving (Eq, Ord)

instance Show Partiality where

show p = case p of

Partial -> quMark

Total -> exMark

data OpItem = OpDecl [OpId] TypeScheme [OpAttr] [Pos]

-- pos ","s, ":", ","s, "assoc", "comm", "idem", "unit"

| OpDefn OpId [[VarDecl]] TypeScheme Partiality Term [Pos]

-- pos "("s, ";"s, ")"s, ":" or ":?", "="

deriving (Show, Eq)

data BinOpAttr = Assoc | Comm | Idem deriving Eq

instance Show BinOpAttr where

show a = case a of

Assoc -> assocS

Comm -> commS

Idem -> idemS

data OpAttr = BinOpAttr BinOpAttr [Pos]

| UnitOpAttr Term [Pos] deriving Show

data DatatypeDecl = DatatypeDecl

TypePattern

Kind

[Annoted Alternative]

[ClassId]

[Pos]

-- pos "::=", "|"s, "deriving"

deriving (Show, Eq)

data Alternative = Constructor UninstOpId [[Component]] Partiality [Pos]

-- pos: "("s, ";"s, ")"s, "?"

| Subtype [Type] [Pos]

-- pos: "type", ","s

deriving Show

data Component = Selector UninstOpId Partiality Type SeparatorKind Pos

-- pos ",", ":" or ":?"

| NoSelector Type

deriving Show

data Quantifier = Universal | Existential | Unique

deriving (Eq, Ord)

instance Show Quantifier where

show q = case q of

Universal -> forallS

Existential -> existsS

Unique -> existsS ++ exMark

data TypeQual = OfType | AsType | InType deriving (Eq, Ord)

instance Show TypeQual where

show q = case q of

OfType -> colonS

AsType -> asS

InType -> inS

data LetBrand = Let | Where deriving (Show, Eq, Ord)

data BracketKind = Parens | Squares | Braces deriving (Show, Eq, Ord)

getBrackets :: BracketKind -> (String, String)

getBrackets b = case b of

Parens -> ("(", ")")

Squares -> ("[", "]")

Braces -> ("{", "}")

-- parse quantified formulae as terms first

-- eases also parsing of formulae in parenthesis

data Term = QualVar VarDecl

-- pos "(", "var", ":", ")"

| QualOp OpBrand InstOpId TypeScheme [Pos]

-- pos "(", "op", ":", ")"

| ResolvedMixTerm Id [Term] [Pos]

| ApplTerm Term Term [Pos] -- analysed

-- pos?

| TupleTerm [Term] [Pos]

-- pos "(", ","s, ")"

| TypedTerm Term TypeQual Type [Pos]

-- pos ":", "as" or "in"

| QuantifiedTerm Quantifier [GenVarDecl] Term [Pos]

-- pos quantifier, ";"s, dot

-- only "forall" may have a TypeVarDecl

| LambdaTerm [Pattern] Partiality Term [Pos]

-- pos "\", dot (plus "!")

| CaseTerm Term [ProgEq] [Pos]

-- pos "case", "of", "|"s

| LetTerm LetBrand [ProgEq] Term [Pos]

-- pos "where", ";"s

| TermToken Token

| MixTypeTerm TypeQual Type [Pos]

| MixfixTerm [Term]

| BracketTerm BracketKind [Term] [Pos]

-- pos brackets, ","s

| AsPattern VarDecl Pattern [Pos]

-- pos "@"

deriving (Show, Eq, Ord)

type Pattern = Term

mkTupleTerm :: [Term] -> [Pos] -> Term

mkTupleTerm ts ps = if isSingle ts then head ts else TupleTerm ts ps

data ProgEq = ProgEq Pattern Term Pos deriving (Show, Eq, Ord)

-- pos "=" (or "->" following case-of)

-- ----------------------------------------------------------------------------

-- (type) var decls

-- ----------------------------------------------------------------------------

data SeparatorKind = Comma | Other deriving (Show, Eq, Ord)

data VarDecl = VarDecl Var Type SeparatorKind [Pos] deriving Show

-- pos "," or ":"

data TypeArg = TypeArg TypeId Kind SeparatorKind [Pos]

-- pos "," or ":" ("+" or "-" pos is moved to ExtClass)

deriving Show

data GenVarDecl = GenVarDecl VarDecl

| GenTypeVarDecl TypeArg

deriving (Show, Eq, Ord)

-- ----------------------------------------------------------------------------

-- op names

-- ----------------------------------------------------------------------------

data OpId = OpId UninstOpId [TypeArg] [Pos] deriving (Show, Eq, Ord)

-- pos "[", ";"s, "]"

data InstOpId = InstOpId UninstOpId [Type] [Pos] deriving (Show, Eq, Ord)

-- ----------------------------------------------------------------------------

-- ids

-- ----------------------------------------------------------------------------

type TypeId = Id

type UninstOpId = Id

type Var = Id

type ClassId = Id -- TOKEN-ID (one token with compound list, like CASL sorts)

-- * symbol data types

-- | symbols

data SymbItems = SymbItems SymbKind [Symb] [Annotation] [Pos]

-- pos: kind, commas

deriving (Show, Eq)

-- | mapped symbols

data SymbMapItems = SymbMapItems SymbKind [SymbOrMap] [Annotation] [Pos]

-- pos: kind commas

deriving (Show, Eq)

-- | kind of symbols

data SymbKind = Implicit | SK_type | SK_sort | SK_fun | SK_op | SK_pred

| SK_class

deriving (Show, Eq, Ord)

-- | type annotated symbols

data Symb = Symb Id (Maybe SymbType) [Pos]

-- pos: colon (or empty)

deriving (Show, Eq)

-- | type for symbols

data SymbType = SymbType TypeScheme

deriving (Show, Eq)

-- | mapped symbol

data SymbOrMap = SymbOrMap Symb (Maybe Symb) [Pos]

-- pos: "|->" (or empty)

deriving (Show, Eq)

-- ----------------------------------------------------------------------------

-- equality instances while ignoring positions

-- ----------------------------------------------------------------------------

instance Eq Kind where

MissingKind == MissingKind = True

Downset _ t1 _ _ == Downset _ t2 _ _ = t1 == t2

ClassKind i1 _ == ClassKind i2 _ = i1 == i2

Intersection ks1 _ == Intersection ks2 _ = ks1 == ks2

FunKind p1 c1 _ == FunKind p2 c2 _ = (p1, c1) == (p2, c2)

ExtKind c1 v1 _ == ExtKind c2 v2 _ = (c1, v1) == (c2, v2)

_ == _ = False

instance Ord Kind where

MissingKind <= MissingKind = True

Downset _ t1 _ _ <= Downset _ t2 _ _ = t1 <= t2

ClassKind i1 _ <= ClassKind i2 _ = i1 <= i2

Intersection ks1 _ <= Intersection ks2 _ = ks1 <= ks2

FunKind p1 c1 _ <= FunKind p2 c2 _ = (p1, c1) <= (p2, c2)

ExtKind c1 v1 _ <= ExtKind c2 v2 _ = (c1, v1) <= (c2, v2)

MissingKind <= _ = True

_ <= MissingKind = False

Downset _ _ _ _ <= _ = True

_ <= Downset _ _ _ _ = False

ClassKind _ _ <= _ = True

_ <= ClassKind _ _ = False

Intersection _ _ <= _ = True

_ <= Intersection _ _ = False

ExtKind _ _ _ <= _ = True

_ <= ExtKind _ _ _ = False

instance Eq Type where

TypeName i1 k1 v1 == TypeName i2 k2 v2 =

if v1 == 0 && v2 == 0 then (i1, k1) == (i2, k2)

else (v1, k1) == (v2, k2)

TypeAppl f1 a1 == TypeAppl f2 a2 = (f1, a1) == (f2, a2)

TypeToken t1 == TypeToken t2 = t1 == t2

BracketType b1 l1 _ == BracketType b2 l2 _ = (b1, l1) == (b2, l2)

KindedType t1 k1 _ == KindedType t2 k2 _ = (t1, k1) == (t2, k2)

MixfixType l1 == MixfixType l2 = l1 == l2

LazyType t1 _ == LazyType t2 _ = t1 == t2

ProductType l1 _ == ProductType l2 _ = l1 == l2

FunType f1 a1 g1 _ == FunType f2 a2 g2 _ = (f1, a1, g1) == (f2, a2, g2)

ExpandedType _ t1 == t2 = t1 == t2

t1 == ExpandedType _ t2 = t1 == t2

_ == _ = False

instance Ord Type where

TypeName i1 k1 v1 <= TypeName i2 k2 v2 =

if v1 == 0 && v2 == 0 then (i1, k1) <= (i2, k2)

else (v1, k1) <= (v2, k2)

TypeAppl f1 a1 <= TypeAppl f2 a2 = (f1, a1) <= (f2, a2)

TypeToken t1 <= TypeToken t2 = t1 <= t2

BracketType b1 l1 _ <= BracketType b2 l2 _ = (b1, l1) <= (b2, l2)

KindedType t1 k1 _ <= KindedType t2 k2 _ = (t1, k1) <= (t2, k2)

MixfixType l1 <= MixfixType l2 = l1 <= l2

LazyType t1 _ <= LazyType t2 _ = t1 <= t2

ProductType l1 _ <= ProductType l2 _ = l1 <= l2

FunType f1 a1 g1 _ <= FunType f2 a2 g2 _ = (f1, a1, g1) <= (f2, a2, g2)

ExpandedType _ t1 <= t2 = t1 <= t2

t1 <= ExpandedType _ t2 = t1 <= t2

TypeName _ _ _ <= _ = True

_ <= TypeName _ _ _ = False

TypeAppl _ _ <= _ = True

_ <= TypeAppl _ _ = False

TypeToken _ <= _ = True

_ <= TypeToken _ = False

BracketType _ _ _ <= _ = True

_ <= BracketType _ _ _ = False

KindedType _ _ _ <= _ = True

_ <= KindedType _ _ _ = False

MixfixType _ <= _ = True

_ <= MixfixType _ = False

LazyType _ _<= _ = True

_ <= LazyType _ _ = False

ProductType _ _<= _ = True

_ <= ProductType _ _ = False

instance Eq TypeArg where

TypeArg i1 k1 _ _ == TypeArg i2 k2 _ _ = (i1, k1) == (i2, k2)

instance Ord TypeArg where

TypeArg i1 k1 _ _ <= TypeArg i2 k2 _ _ = (i1, k1) <= (i2, k2)

-- this is strict syntactic equality

-- unification only captures analysed types and ignores lazy types!

instance Eq TypeScheme where

TypeScheme v1 t1 _ == TypeScheme v2 t2 _ = (v1, t1) == (v2, t2)

instance Ord TypeScheme where

TypeScheme v1 t1 _ <= TypeScheme v2 t2 _ = (v1, t1) <= (v2, t2)

instance Eq Vars where

Var v1 == Var v2 = v1 == v2

VarTuple l1 _ == VarTuple l2 _ = l1 == l2

_ == _ = False

instance Eq VarDecl where

VarDecl v1 t1 _ _ == VarDecl v2 t2 _ _ = (v1, t1) == (v2, t2)

instance Ord VarDecl where

VarDecl v1 t1 _ _ <= VarDecl v2 t2 _ _ = (v1, t1) <= (v2, t2)

instance Eq OpAttr where

BinOpAttr b1 _ == BinOpAttr b2 _ = b1 == b2

UnitOpAttr t1 _ == UnitOpAttr t2 _= t1 == t2

_ == _ = False

instance Eq Alternative where

Constructor i1 l1 p1 _ == Constructor i2 l2 p2 _ =

(i1, l1, p1) == (i2, l2, p2)

Subtype t1 _ == Subtype t2 _ = t1 == t2

_ == _ = False

instance Eq Component where

Selector i1 p1 t1 _ _ == Selector i2 p2 t2 _ _ =

(i1, t1, p1) == (i2, t2, p2)

NoSelector t1 == NoSelector t2 = t1 == t2

_ == _ = False