10769

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(* Title: TFL/thry.ML


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ID: $Id$


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Author: Konrad Slind, Cambridge University Computer Laboratory


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Copyright 1997 University of Cambridge


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*)


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signature THRY =


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sig


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val match_term: theory > term > term > (term * term) list * (typ * typ) list


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val match_type: theory > typ > typ > (typ * typ) list


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val typecheck: theory > term > cterm


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(*datatype facts of various flavours*)


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val match_info: theory > string > {constructors: term list, case_const: term} option


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val induct_info: theory > string > {constructors: term list, nchotomy: thm} option


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val extract_info: theory > {case_congs: thm list, case_rewrites: thm list}


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end;


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structure Thry: THRY =


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struct


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fun THRY_ERR func mesg = Utils.ERR {module = "Thry", func = func, mesg = mesg};


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(*


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* Matching


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**)


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local fun tybind (x,y) = (TVar (x, HOLogic.typeS) , y)

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fun tmbind (x,y) = (Var (x, Term.type_of y), y)


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in


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fun match_term thry pat ob =


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let val tsig = Sign.tsig_of (Theory.sign_of thry)


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val (ty_theta,tm_theta) = Pattern.match tsig (pat,ob)


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in (map tmbind tm_theta, map tybind ty_theta)


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end


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fun match_type thry pat ob = map tybind (Vartab.dest


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(Type.typ_match (Sign.tsig_of (Theory.sign_of thry)) (Vartab.empty, (pat,ob))))


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end;


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(*


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* Typing


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**)


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fun typecheck thry t =


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Thm.cterm_of (Theory.sign_of thry) t


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handle TYPE (msg, _, _) => raise THRY_ERR "typecheck" msg


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 TERM (msg, _) => raise THRY_ERR "typecheck" msg;


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(*


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* Get information about datatypes


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**)


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fun get_info thy ty = Symtab.lookup (DatatypePackage.get_datatypes thy, ty);


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fun match_info thy tname =


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case (DatatypePackage.case_const_of thy tname, DatatypePackage.constrs_of thy tname) of

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(SOME case_const, SOME constructors) =>


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SOME {case_const = case_const, constructors = constructors}


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 _ => NONE;

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fun induct_info thy tname = case get_info thy tname of

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NONE => NONE


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 SOME {nchotomy, ...} =>


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SOME {nchotomy = nchotomy,

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constructors = the (DatatypePackage.constrs_of thy tname)};


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fun extract_info thy =


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let val infos = map snd (Symtab.dest (DatatypePackage.get_datatypes thy))


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in {case_congs = map (mk_meta_eq o #case_cong) infos,


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case_rewrites = flat (map (map mk_meta_eq o #case_rewrites) infos)}


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end;


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end;
