author  wenzelm 
Thu, 27 Jul 1995 13:13:32 +0200  
changeset 1201  de2fc8cf9b6a 
parent 886  9af08725600b 
child 1217  f96a04c6b352 
permissions  rwrr 
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(* Title: Pure/axclass.ML 
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ID: $Id$ 
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Author: Markus Wenzel, TU Muenchen 
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560  5 
User interfaces for axiomatic type classes. 
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*) 
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signature AX_CLASS = 
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sig 
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structure Tactical: TACTICAL 
560  11 
local open Tactical Tactical.Thm in 
423  12 
val add_thms_as_axms: (string * thm) list > theory > theory 
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val add_classrel_thms: thm list > theory > theory 

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val add_arity_thms: thm list > theory > theory 

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val add_axclass: class * class list > (string * string) list 
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> theory > theory 
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val add_axclass_i: class * class list > (string * term) list 
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> theory > theory 
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val add_inst_subclass: class * class > string list > thm list 
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> tactic option > theory > theory 
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val add_inst_arity: string * sort list * class list > string list 
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> thm list > tactic option > theory > theory 
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val axclass_tac: theory > thm list > tactic 
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val prove_subclass: theory > class * class > thm list 
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> tactic option > thm 

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val prove_arity: theory > string * sort list * class > thm list 

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> tactic option > thm 

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val goal_subclass: theory > class * class > thm list 
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val goal_arity: theory > string * sort list * class > thm list 

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end 
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end; 
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functor AxClassFun(structure Logic: LOGIC and Goals: GOALS and Tactic: TACTIC 
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sharing Goals.Tactical = Tactic.Tactical): AX_CLASS = 
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struct 
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structure Tactical = Goals.Tactical; 
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structure Thm = Tactical.Thm; 
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structure Sign = Thm.Sign; 
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structure Type = Sign.Type; 
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structure Pretty = Sign.Syntax.Pretty; 
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open Logic Thm Tactical Tactic Goals; 
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(** utilities **) 
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(* type vars *) 
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fun map_typ_frees f (Type (t, tys)) = Type (t, map (map_typ_frees f) tys) 
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 map_typ_frees f (TFree a) = f a 
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 map_typ_frees _ a = a; 
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val map_term_tfrees = map_term_types o map_typ_frees; 
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fun aT S = TFree ("'a", S); 
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(* get axioms and theorems *) 
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fun get_ax thy name = 
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Some (get_axiom thy name) handle THEORY _ => None; 
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val get_axioms = mapfilter o get_ax; 
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val is_def = is_equals o #prop o rep_thm; 
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fun witnesses thy axms thms = 
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map (get_axiom thy) axms @ thms @ filter is_def (map snd (axioms_of thy)); 
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560  73 
(** abstract syntax operations **) 
423  74 

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(* subclass relations as terms *) 

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fun mk_classrel (c1, c2) = mk_inclass (aT [c1], c2); 

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fun dest_classrel tm = 

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let 

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fun err () = raise_term "dest_classrel" [tm]; 

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val (ty, c2) = dest_inclass (freeze_vars tm) handle TERM _ => err (); 

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val c1 = (case ty of TFree (_, [c]) => c  _ => err ()); 

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in 

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(c1, c2) 

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end; 

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(* arities as terms *) 

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fun mk_arity (t, ss, c) = 

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let 

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val names = tl (variantlist (replicate (length ss + 1) "'", [])); 
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val tfrees = map TFree (names ~~ ss); 
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in 

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mk_inclass (Type (t, tfrees), c) 

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end; 

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fun dest_arity tm = 

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let 

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fun err () = raise_term "dest_arity" [tm]; 

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val (ty, c) = dest_inclass (freeze_vars tm) handle TERM _ => err (); 

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val (t, tfrees) = 

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(case ty of 

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Type (t, tys) => (t, map (fn TFree x => x  _ => err ()) tys) 

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 _ => err ()); 

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val ss = 

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if null (gen_duplicates eq_fst tfrees) 

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then map snd tfrees else err (); 

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in 

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(t, ss, c) 

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end; 

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560  118 
(** add theorems as axioms **) 
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fun prep_thm_axm thy thm = 

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let 

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fun err msg = raise THM ("prep_thm_axm: " ^ msg, 0, [thm]); 

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val {sign, hyps, prop, ...} = rep_thm thm; 

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in 

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if not (Sign.subsig (sign, sign_of thy)) then 

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err "theorem not of same theory" 

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else if not (null hyps) then 

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err "theorem may not contain hypotheses" 

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else prop 

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end; 

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(*general theorems*) 

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fun add_thms_as_axms thms thy = 

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add_axioms_i (map (apsnd (prep_thm_axm thy)) thms) thy; 

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(*theorems expressing class relations*) 

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fun add_classrel_thms thms thy = 

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let 

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fun prep_thm thm = 

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let 

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val prop = prep_thm_axm thy thm; 

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val (c1, c2) = dest_classrel prop handle TERM _ => 

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raise THM ("add_classrel_thms: theorem is not a class relation", 0, [thm]); 

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in (c1, c2) end; 

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in 

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add_classrel (map prep_thm thms) thy 

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end; 

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(*theorems expressing arities*) 

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fun add_arity_thms thms thy = 

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let 

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fun prep_thm thm = 

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let 

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val prop = prep_thm_axm thy thm; 

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val (t, ss, c) = dest_arity prop handle TERM _ => 

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raise THM ("add_arity_thms: theorem is not an arity", 0, [thm]); 

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in (t, ss, [c]) end; 

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in 

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add_arities (map prep_thm thms) thy 

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end; 

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(** add axiomatic type classes **) 

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(* errors *) 
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fun err_not_logic c = 
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error ("Axiomatic class " ^ quote c ^ " not subclass of \"logic\""); 
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fun err_bad_axsort ax c = 
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error ("Sort constraint in axiom " ^ quote ax ^ " not supersort of " ^ quote c); 
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fun err_bad_tfrees ax = 
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error ("More than one type variable in axiom " ^ quote ax); 
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(* ext_axclass *) 
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fun ext_axclass prep_axm (class, super_classes) raw_axioms old_thy = 
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let 
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val axioms = map (prep_axm (sign_of old_thy)) raw_axioms; 
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val thy = add_classes [(class, super_classes)] old_thy; 
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val sign = sign_of thy; 
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(* prepare abstract axioms *) 
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fun abs_axm ax = 
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if null (term_tfrees ax) then 
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mk_implies (mk_inclass (aT logicS, class), ax) 
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else 
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map_term_tfrees (K (aT [class])) ax; 
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val abs_axioms = map (apsnd abs_axm) axioms; 
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(* prepare introduction orule *) 
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val _ = 
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if Sign.subsort sign ([class], logicS) then () 
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else err_not_logic class; 
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fun axm_sort (name, ax) = 
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(case term_tfrees ax of 
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[] => [] 
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 [(_, S)] => 
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if Sign.subsort sign ([class], S) then S 
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else err_bad_axsort name class 
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 _ => err_bad_tfrees name); 
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val axS = Sign.norm_sort sign (logicC :: flat (map axm_sort axioms)); 
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val int_axm = close_form o map_term_tfrees (K (aT axS)); 
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fun inclass c = mk_inclass (aT axS, c); 
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val intro_axm = list_implies 
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(map inclass super_classes @ map (int_axm o snd) axioms, inclass class); 
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in 
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add_axioms_i ((class ^ "I", intro_axm) :: abs_axioms) thy 
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end; 
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(* external interfaces *) 
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val add_axclass = ext_axclass read_axm; 
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val add_axclass_i = ext_axclass cert_axm; 
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(** prove class relations and type arities **) 
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(* class_axms *) 

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fun class_axms thy = 
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let 
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val classes = Sign.classes (sign_of thy); 
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val intros = map (fn c => c ^ "I") classes; 
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in 
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get_axioms thy intros @ 
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map (class_triv thy) classes 
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end; 
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423  245 

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(* axclass_tac *) 

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(*(1) repeatedly resolve goals of form "OFCLASS(ty, c_class)", 
423  249 
try "cI" axioms first and use class_triv as last resort 
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(2) rewrite goals using user supplied definitions 

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(3) repeatedly resolve goals with user supplied nondefinitions*) 

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fun axclass_tac thy thms = 

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TRY (REPEAT_FIRST (resolve_tac (class_axms thy))) THEN 

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TRY (rewrite_goals_tac (filter is_def thms)) THEN 
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TRY (REPEAT_FIRST (resolve_tac (filter_out is_def thms))); 

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423  259 
(* provers *) 
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423  261 
fun prove term_of str_of thy sig_prop thms usr_tac = 
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let 
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val sign = sign_of thy; 
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val goal = cterm_of sign (term_of sig_prop); 
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val tac = axclass_tac thy thms THEN (if_none usr_tac all_tac); 

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in 

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prove_goalw_cterm [] goal (K [tac]) 

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end 

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handle ERROR => error ("The error(s) above occurred while trying to prove " 

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^ quote (str_of sig_prop)); 

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val prove_subclass = 
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prove mk_classrel (fn (c1, c2) => c1 ^ " < " ^ c2); 
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423  275 
val prove_arity = 
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prove mk_arity (fn (t, ss, c) => Type.str_of_arity (t, ss, [c])); 

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423  279 
(* make goals (for interactive use) *) 
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fun mk_goal term_of thy sig_prop = 

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goalw_cterm [] (cterm_of (sign_of thy) (term_of sig_prop)); 

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val goal_subclass = mk_goal mk_classrel; 

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val goal_arity = mk_goal mk_arity; 

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449  289 
(** add proved subclass relations and arities **) 
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449  293 
fun add_inst_subclass (c1, c2) axms thms usr_tac thy = 
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add_classrel_thms 
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[prove_subclass thy (c1, c2) (witnesses thy axms thms) usr_tac] thy; 
423  296 

449  297 
fun add_inst_arity (t, ss, cs) axms thms usr_tac thy = 
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let 
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val wthms = witnesses thy axms thms; 
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fun prove c = 
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prove_arity thy (t, ss, c) wthms usr_tac; 
423  302 
in 
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add_arity_thms (map prove cs) thy 

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end; 

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end; 