author | skalberg |
Thu, 09 Oct 2003 18:13:32 +0200 | |
changeset 14223 | 0ee05eef881b |
parent 14222 | 1e61f23fd359 |
child 14620 | 1be590fd2422 |
permissions | -rw-r--r-- |
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(* Title: HOL/Tools/specification_package.ML |
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ID: $Id$ |
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Author: Sebastian Skalberg, TU Muenchen |
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License: GPL (GNU GENERAL PUBLIC LICENSE) |
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Package for defining constants by specification. |
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*) |
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signature SPECIFICATION_PACKAGE = |
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sig |
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val quiet_mode: bool ref |
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val add_specification_i: string option -> (bstring * xstring * bool) list |
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-> theory * thm -> theory * thm |
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end |
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structure SpecificationPackage : SPECIFICATION_PACKAGE = |
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struct |
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(* messages *) |
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val quiet_mode = ref false |
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fun message s = if ! quiet_mode then () else writeln s |
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local |
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val _ = Goal "[| Ex P ; c == Eps P |] ==> P c" |
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val _ = by (Asm_simp_tac 1) |
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val _ = by (rtac (thm "someI_ex") 1) |
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val _ = ba 1 |
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in |
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val helper = Goals.result() |
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end |
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(* Akin to HOLogic.exists_const *) |
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fun choice_const T = Const("Hilbert_Choice.Eps",(T-->HOLogic.boolT)-->T) |
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(* Actual code *) |
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local |
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fun mk_definitional [] arg = arg |
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| mk_definitional ((thname,cname,covld)::cos) (thy,thm) = |
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case HOLogic.dest_Trueprop (concl_of thm) of |
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Const("Ex",_) $ P => |
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let |
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val ctype = domain_type (type_of P) |
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val cname_full = Sign.intern_const (sign_of thy) cname |
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val cdefname = if thname = "" |
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then Thm.def_name (Sign.base_name cname) |
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else thname |
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val def_eq = Logic.mk_equals (Const(cname_full,ctype),choice_const ctype $ P) |
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val (thy',thms) = PureThy.add_defs_i covld [((cdefname,def_eq),[])] thy |
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val thm' = [thm,hd thms] MRS helper |
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in |
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mk_definitional cos (thy',thm') |
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end |
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| _ => raise THM ("Internal error: Bad specification theorem",0,[thm]) |
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fun mk_axiomatic axname cos arg = |
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let |
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fun process [] (thy,tm) = |
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let |
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val (thy',thms) = PureThy.add_axioms_i [((axname,HOLogic.mk_Trueprop tm),[])] thy |
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in |
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(thy',hd thms) |
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end |
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| process ((thname,cname,covld)::cos) (thy,tm) = |
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case tm of |
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Const("Ex",_) $ P => |
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let |
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val ctype = domain_type (type_of P) |
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val cname_full = Sign.intern_const (sign_of thy) cname |
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val cdefname = if thname = "" |
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then Thm.def_name (Sign.base_name cname) |
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else thname |
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val co = Const(cname_full,ctype) |
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val thy' = Theory.add_finals_i covld [co] thy |
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val tm' = case P of |
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Abs(_, _, bodt) => subst_bound (co, bodt) |
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| _ => P $ co |
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in |
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process cos (thy',tm') |
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end |
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| _ => raise TERM ("Internal error: Bad specification theorem",[tm]) |
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in |
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process cos arg |
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end |
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in |
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fun proc_exprop axiomatic cos arg = |
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case axiomatic of |
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Some axname => mk_axiomatic axname cos (apsnd (HOLogic.dest_Trueprop o concl_of) arg) |
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| None => mk_definitional cos arg |
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end |
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fun add_specification_i axiomatic cos arg = |
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arg |> apsnd freezeT |
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|> proc_exprop axiomatic cos |
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|> apsnd standard |
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(* Collect all intances of constants in term *) |
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fun collect_consts ( t $ u,tms) = collect_consts (u,collect_consts (t,tms)) |
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| collect_consts ( Abs(_,_,t),tms) = collect_consts (t,tms) |
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| collect_consts (tm as Const _,tms) = gen_ins (op aconv) (tm,tms) |
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| collect_consts ( _,tms) = tms |
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(* Complementing Type.varify... *) |
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fun unvarify t fmap = |
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let |
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val fmap' = map Library.swap fmap |
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fun unthaw (f as (a,S)) = |
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(case assoc (fmap',a) of |
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None => TVar f |
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| Some b => TFree (b,S)) |
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in |
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map_term_types (map_type_tvar unthaw) t |
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end |
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(* The syntactic meddling needed to setup add_specification for work *) |
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fun process_spec axiomatic cos alt_props int thy = |
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let |
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fun zip3 [] [] [] = [] |
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| zip3 (x::xs) (y::ys) (z::zs) = (x,y,z)::zip3 xs ys zs |
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| zip3 _ _ _ = error "SpecificationPackage.process_spec internal error" |
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fun myfoldr f [x] = x |
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| myfoldr f (x::xs) = f (x,myfoldr f xs) |
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| myfoldr f [] = error "SpecificationPackage.process_spec internal error" |
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val sg = sign_of thy |
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fun typ_equiv t u = |
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let |
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val tsig = Sign.tsig_of sg |
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in |
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Type.typ_instance(tsig,t,u) andalso |
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Type.typ_instance(tsig,u,t) |
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end |
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val cprops = map (Thm.read_cterm sg o rpair Term.propT o snd) alt_props |
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val ss = empty_ss setmksimps single addsimps [thm "HOL.atomize_imp",thm "HOL.atomize_all"] |
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val rew_imps = map (Simplifier.full_rewrite ss) cprops |
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val props' = map (HOLogic.dest_Trueprop o term_of o snd o dest_equals o cprop_of) rew_imps |
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fun proc_single prop = |
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let |
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val frees = Term.term_frees prop |
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val tsig = Sign.tsig_of (sign_of thy) |
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val _ = assert (forall (fn v => Type.of_sort tsig (type_of v,HOLogic.typeS)) frees) |
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"Specificaton: Only free variables of sort 'type' allowed" |
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val prop_closed = foldr (fn ((vname,T),prop) => HOLogic.mk_all (vname,T,prop)) (map dest_Free frees,prop) |
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in |
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(prop_closed,frees) |
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end |
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val props'' = map proc_single props' |
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val frees = map snd props'' |
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val prop = myfoldr HOLogic.mk_conj (map fst props'') |
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val cprop = cterm_of sg (HOLogic.mk_Trueprop prop) |
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val (prop_thawed,vmap) = Type.varify (prop,[]) |
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val thawed_prop_consts = collect_consts (prop_thawed,[]) |
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val (altcos,overloaded) = Library.split_list cos |
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val (names,sconsts) = Library.split_list altcos |
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val consts = map (term_of o Thm.read_cterm sg o rpair TypeInfer.logicT) sconsts |
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val _ = assert (not (Library.exists (not o Term.is_Const) consts)) |
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"Specification: Non-constant found as parameter" |
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fun proc_const c = |
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let |
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val c' = fst (Type.varify (c,[])) |
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val (cname,ctyp) = dest_Const c' |
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in |
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case filter (fn t => let val (name,typ) = dest_Const t |
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in name = cname andalso typ_equiv typ ctyp |
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end) thawed_prop_consts of |
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[] => error ("Specification: No suitable instances of constant \"" ^ (Sign.string_of_term sg c) ^ "\" found") |
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| [cf] => unvarify cf vmap |
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| _ => error ("Specification: Several variations of \"" ^ (Sign.string_of_term sg c) ^ "\" found (try applying explicit type constraints)") |
14115 | 180 |
end |
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val proc_consts = map proc_const consts |
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fun mk_exist (c,prop) = |
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let |
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val T = type_of c |
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val cname = Sign.base_name (fst (dest_Const c)) |
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val vname = if Syntax.is_identifier cname |
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then cname |
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else "x" |
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in |
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HOLogic.exists_const T $ Abs(vname,T,Term.abstract_over (c,prop)) |
14115 | 191 |
end |
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val ex_prop = foldr mk_exist (proc_consts,prop) |
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val cnames = map (fst o dest_Const) proc_consts |
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fun post_process (arg as (thy,thm)) = |
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let |
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fun inst_all sg (thm,v) = |
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let |
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val cv = cterm_of sg v |
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val cT = ctyp_of_term cv |
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val spec' = instantiate' [Some cT] [None,Some cv] spec |
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in |
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thm RS spec' |
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203 |
end |
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fun remove_alls frees thm = foldl (inst_all (sign_of_thm thm)) (thm,frees) |
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fun process_single ((name,atts),rew_imp,frees) args = |
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let |
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fun undo_imps thm = |
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equal_elim (symmetric rew_imp) thm |
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|
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fun apply_atts arg = Thm.apply_attributes (arg,map (Attrib.global_attribute thy) atts) |
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fun add_final (arg as (thy,thm)) = |
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if name = "" |
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then arg |
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else (writeln (" " ^ name ^ ": " ^ (string_of_thm thm)); |
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PureThy.store_thm((name,thm),[]) thy) |
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in |
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args |> apsnd (remove_alls frees) |
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|> apsnd undo_imps |
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|> apsnd standard |
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|> apply_atts |
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|> add_final |
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end |
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223 |
|
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fun process_all [proc_arg] args = |
225 |
process_single proc_arg args |
|
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| process_all (proc_arg::rest) (thy,thm) = |
|
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let |
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val single_th = thm RS conjunct1 |
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val rest_th = thm RS conjunct2 |
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val (thy',_) = process_single proc_arg (thy,single_th) |
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in |
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process_all rest (thy',rest_th) |
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end |
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| process_all [] _ = error "SpecificationPackage.process_spec internal error" |
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val alt_names = map fst alt_props |
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val _ = if exists (fn(name,_) => not (name = "")) alt_names |
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then writeln "specification" |
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else () |
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239 |
in |
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arg |> apsnd freezeT |
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|> process_all (zip3 alt_names rew_imps frees) |
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end |
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in |
244 |
IsarThy.theorem_i Drule.internalK |
|
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(("",[add_specification_i axiomatic (zip3 names cnames overloaded),post_process]), |
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(HOLogic.mk_Trueprop ex_prop,([],[]))) int thy |
247 |
end |
|
248 |
||
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(* outer syntax *) |
|
250 |
||
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local structure P = OuterParse and K = OuterSyntax.Keyword in |
|
252 |
||
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(* taken from ~~/Pure/Isar/isar_syn.ML *) |
|
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val opt_overloaded = |
|
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Scan.optional (P.$$$ "(" |-- P.!!! ((P.$$$ "overloaded" >> K true) --| P.$$$ ")")) false |
|
256 |
||
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val opt_name = Scan.optional (P.name --| P.$$$ ":") "" |
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|
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val specification_decl = |
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P.$$$ "(" |-- Scan.repeat1 (opt_name -- P.term -- opt_overloaded) --| P.$$$ ")" -- |
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Scan.repeat1 (P.opt_thm_name ":" -- P.prop) |
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|
263 |
val specificationP = |
|
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OuterSyntax.command "specification" "define constants by specification" K.thy_goal |
|
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(specification_decl >> (fn (cos,alt_props) => |
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Toplevel.print o (Toplevel.theory_to_proof |
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(process_spec None cos alt_props)))) |
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268 |
|
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val ax_specification_decl = |
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P.name -- |
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(P.$$$ "(" |-- Scan.repeat1 (opt_name -- P.term -- opt_overloaded) --| P.$$$ ")" -- |
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Scan.repeat1 (P.opt_thm_name ":" -- P.prop)) |
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|
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val ax_specificationP = |
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OuterSyntax.command "ax_specification" "define constants by specification" K.thy_goal |
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(ax_specification_decl >> (fn (axname,(cos,alt_props)) => |
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Toplevel.print o (Toplevel.theory_to_proof |
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(process_spec (Some axname) cos alt_props)))) |
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279 |
|
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val _ = OuterSyntax.add_parsers [specificationP,ax_specificationP] |
14115 | 281 |
|
282 |
end |
|
283 |
||
284 |
||
285 |
end |