{- |

Module : $Header$

Copyright : (c) University of Cambridge, Cambridge, England

adaption (c) Till Mossakowski, Uni Bremen 2002-2004

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

Maintainer : hets@tzi.de

Stability : provisional

Portability : portable

Data structures for Isabelle signatures and theories.

Adapted from Isabelle.

-}

module Isabelle.IsaSign where

import qualified Common.Lib.Map as Map

-- temporary!!

type Axiom = ()

-------------------- not quite from src/Pure/term.ML ------------------------

{-Indexnames can be quickly renamed by adding an offset to the integer part,

for resolution.-}

type Indexname = (String,Int)

{- Types are classified by sorts. -}

-- Classes

data IsaClass = IsaClass { classId :: String, classDef :: [Axiom] }

deriving (Ord, Eq, Show)

type Sort = [IsaClass]

domain:: Sort

domain = [pcpo]

isaTerm :: IsaClass

isaTerm = IsaClass "term" []

holType :: Sort

holType = [IsaClass "hol_type" []]

pcpo :: IsaClass

pcpo = IsaClass "pcpo" []

ho_ho :: [Sort]

ho_ho = [holType, holType]

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

{- The sorts attached to TFrees and TVars specify the sort of that variable -}

data Typ = Type { typeId :: String,

typeArgKind :: [Sort],

typeResultKind :: Sort,

typeArgs :: [Typ] }

| TFree { typeId :: String,

typeSort :: Sort}

| TVar { indexname :: Indexname, -- (String,Int)

typeSort :: Sort }

deriving (Eq, Ord, Show)

noType :: Typ

noType = dummyT

dummyT :: Typ

dummyT = Type "dummy" [] holType []

boolType :: Typ

boolType = Type "bool" [] holType []

mkOptionType :: Typ -> Typ

mkOptionType t = Type "option" [holType] holType [t]

prodS :: String

prodS = "*" -- this is printed as it is!

prodType :: Typ -> Typ -> Typ

prodType t1 t2 = Type prodS ho_ho holType [t1,t2]

typeApplS :: String

typeApplS = "typeAppl" -- maybe this should be " " for printing

mkTypeAppl :: Typ -> Typ -> Typ

mkTypeAppl t1 t2 = Type typeApplS ho_ho holType [t1,t2]

funS :: String

funS = "fun" -- may be this should be "=>" for printing

mkFunType :: Typ -> Typ -> Typ

mkFunType s t = Type funS ho_ho holType [s,t] -- was "-->" before

{-handy for multiple args: [T1,...,Tn]--->T gives T1-->(T2--> ... -->T)-}

mkCurryFunType :: [Typ] -> Typ -> Typ

mkCurryFunType = flip $ foldr mkFunType -- was "--->" before

voidDom :: Typ

voidDom = Type "void" [] domain []

-- voidDom = Type ("void",[pcpo],[])

{- should this be included (as primitive)? -}

flatDom :: Typ

flatDom = Type "flat" [] domain []

{- sort is ok? -}

mkContFun :: Typ -> Typ -> Typ

mkContFun t1 t2 = Type "dFun" [domain, domain] domain [t1,t2]

mkDomProduct :: Typ -> Typ -> Typ

mkDomProduct t1 t2 = Type "**" [domain, domain] domain [t1,t2]

mkDomSum :: Typ -> Typ -> Typ

mkDomSum t1 t2 = Type "++" [domain, domain] domain [t1,t2]

mkDomAppl :: Typ -> Typ -> Typ

mkDomAppl t1 t2 = Type "domAppl" [domain, domain] domain [t1,t2]

{-Terms. Bound variables are indicated by depth number.

Free variables, (scheme) variables and constants have names.

A term is "closed" if every bound variable of level "lev"

is enclosed by at least "lev" abstractions.

It is possible to create meaningless terms containing loose bound vars

or type mismatches. But such terms are not allowed in rules. -}

data Flag = IsCont | NotCont deriving (Eq, Ord ,Show)

data Term =

Const { termBasicId::String,

termType::Typ,

defaultClass::IsaClass } -- constants, with default class

| Free { termBasicId::String,

termType::Typ,

defaultClass::IsaClass } -- free variables

-- | Var (Indexname, Typ)

-- | Bound Int

| Abs { termId::Term,

termType::Typ,

absVar::Term,

flag::Flag } -- lambda abstraction

| App { funId::Term,

argId::Term,

flag::Flag } -- application

| Case { termId::Term, caseSubst::[(Term, Term)], flag::Flag } -- case

| If { ifId::Term,

thenId::Term,

elseId::Term,

flag::Flag } -- If then else

| Let { letSubst::[(Term, Term)],

inId::Term,

flag::Flag } -- Let

| Fix { funId::Term }

deriving (Eq, Ord, Show)

data Sentence = Sentence { senTerm :: Term } deriving (Eq, Ord, Show)

-------------------- from src/Pure/sorts.ML ------------------------

{-- type classes and sorts --}

{-

Classes denote (possibly empty) collections of types that are

partially ordered by class inclusion. They are represented

symbolically by !!!!! strings. !!!!!!!!!!!

Sorts are intersections of finitely many classes. They are

represented by lists of classes. Normal forms of sorts are sorted

lists of minimal classes (wrt. current class inclusion).

(already defined in Pure/term.ML)

-}

{- sort signature information -}

{-

classrel:

table representing the proper subclass relation; entries (c, cs)

represent the superclasses cs of c;

arities:

table of association lists of all type arities; (t, ars) means

that type constructor t has the arities ars; an element (c, Ss) of

ars represents the arity t::(Ss)c;

-}

type Classrel = Map.Map IsaClass Sort

type Arities = Map.Map String [(IsaClass, [Sort])]

-------------------- from src/Pure/type.ML ------------------------

{- check what all the fields are. in particualar, check what arities

are in Isabelle and try to understand what role they play in the

translation. Then see whether there is some overlap with the new

definition of Sort.

emotional note -what the hell are all these strings?!

maybe after all its better to use the new representation of Sort,

threfrom extracting the arities when needed.

OK, add the HOLCF terms.

What's Syntax?

the problem now is to see where information about classes turns out

essential. it is not clear whether we need to encode class

information explicitly in the term data-type. after all, classes

should be inferred by the type. anyway, its time to check the actual

translation. the most critical point seems to be beta-reduction -

that should actually produce proof obligations. -}

data TypeSig =

TySg {

classrel:: Classrel, -- domain of the map yields the classes

defaultSort:: Sort,

log_types:: [String],

univ_witness:: Maybe (Typ, Sort),

abbrs:: Map.Map String ([String], Typ),

arities:: Arities } -- the former field tycons can be computed

deriving (Eq, Show)

emptyTypeSig :: TypeSig

emptyTypeSig = TySg {

classrel = Map.empty,

defaultSort = [],

log_types = [],

univ_witness = Nothing,

abbrs = Map.empty,

arities = Map.empty }

-------------------- from src/Pure/sign.ML ------------------------

data Sign = Sign { baseSig :: String, -- like Pure, HOL, Main etc.

tsig :: TypeSig,

constTab :: Map.Map String Typ, -- constants with type

dataTypeTab :: DataTypeTab,

domainTab :: DomainTab,

-- needs HOLCF, extend this with domains

showLemmas :: Bool

}

deriving (Eq, Show)

{- list of datatype definitions

each of these consists of a list of (mutually recursive) datatypes

each datatype consists of its name (Typ) and a list of constructors

each constructor consists of its name (String) and list of argument types

-}

type DataTypeTab = [DataTypeTabEntry]

type DataTypeTabEntry = [(Typ,[DataTypeAlt])] -- (type,[constructors])

type DataTypeAlt = (String,[Typ])

type DomainTab = [DomainTabEntry]

type DomainTabEntry = [(Typ,[DomainAlt])] -- (type,[constructors])

type DomainAlt = (String,[Typ])

emptySign :: Sign

emptySign = Sign { baseSig = "Pure",

tsig = emptyTypeSig,

constTab = Map.empty,

dataTypeTab = [],

domainTab = [],

showLemmas = False }