author  wenzelm 
Mon, 06 Oct 1997 18:57:17 +0200  
changeset 3788  51bd5c0954c6 
parent 3764  fe7719aee219 
child 3809  6633694439c0 
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 = 
1498  9 
sig 
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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 

3788  17 
val add_inst_subclass_i: class * class > string list > thm list 
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> tactic option > theory > theory 

1498  19 
val add_inst_subclass: class * class > string list > thm list 
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> tactic option > theory > theory 

3788  21 
val add_inst_arity_i: string * sort list * class list > string list 
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> thm list > tactic option > theory > theory 

1498  23 
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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1498  34 
structure AxClass : AX_CLASS = 
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struct 
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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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3395  49 
fun dest_varT (TFree (x, S)) = ((x, ~1), S) 
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 dest_varT (TVar xi_S) = xi_S 

3788  51 
 dest_varT T = raise TYPE ("dest_varT", [T], []); 
3395  52 

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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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1498  61 
val is_def = Logic.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  68 
(** abstract syntax operations **) 
423  69 

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(* subclass relations as terms *) 

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1498  72 
fun mk_classrel (c1, c2) = Logic.mk_inclass (aT [c1], c2); 
423  73 

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fun dest_classrel tm = 

75 
let 

3788  76 
fun err () = raise TERM ("dest_classrel", [tm]); 
423  77 

3395  78 
val (ty, c2) = Logic.dest_inclass tm handle TERM _ => err (); 
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val c1 = (case dest_varT ty of (_, [c]) => c  _ => err ()) 

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handle TYPE _ => err (); 

423  81 
in 
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(c1, c2) 

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end; 

84 

85 

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(* arities as terms *) 

87 

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fun mk_arity (t, ss, c) = 

89 
let 

449  90 
val names = tl (variantlist (replicate (length ss + 1) "'", [])); 
2266  91 
val tfrees = ListPair.map TFree (names, ss); 
423  92 
in 
1498  93 
Logic.mk_inclass (Type (t, tfrees), c) 
423  94 
end; 
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96 
fun dest_arity tm = 

97 
let 

3788  98 
fun err () = raise TERM ("dest_arity", [tm]); 
423  99 

3395  100 
val (ty, c) = Logic.dest_inclass tm handle TERM _ => err (); 
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val (t, tvars) = 

423  102 
(case ty of 
3395  103 
Type (t, tys) => (t, map dest_varT tys handle TYPE _ => err ()) 
423  104 
 _ => err ()); 
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val ss = 

3395  106 
if null (gen_duplicates eq_fst tvars) 
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then map snd tvars else err (); 

423  108 
in 
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(t, ss, c) 

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end; 

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560  114 
(** add theorems as axioms **) 
423  115 

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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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1237  120 
val {sign, hyps, prop, ...} = rep_thm thm; 
423  121 
in 
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if not (Sign.subsig (sign, sign_of thy)) then 

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err "theorem not of same theory" 

1237  124 
else if not (null (extra_shyps thm)) orelse not (null hyps) then 
423  125 
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 = 

3764  131 
Theory.add_axioms_i (map (apsnd (prep_thm_axm thy)) thms) thy; 
423  132 

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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 

3764  143 
Theory.add_classrel (map prep_thm thms) thy 
423  144 
end; 
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146 
(*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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Theory.add_arities (map prep_thm thms) thy 
423  157 
end; 
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159 

160 

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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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3788  177 
fun ext_axclass int prep_axm (raw_class, raw_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; 
3788  180 
val thy = 
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(if int then Theory.add_classes else Theory.add_classes_i) 

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[(raw_class, raw_super_classes)] old_thy; 

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val sign = sign_of thy; 
3788  184 
val class = Sign.intern_class sign raw_class; 
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val super_classes = map (Sign.intern_class sign) raw_super_classes; 

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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 
1498  192 
Logic.mk_implies (Logic.mk_inclass (aT logicS, class), ax) 
3788  193 
else 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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3788  212 
val axS = Sign.norm_sort sign (logicC :: flat (map axm_sort axioms)) 
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1498  214 
val int_axm = Logic.close_form o map_term_tfrees (K (aT axS)); 
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fun inclass c = Logic.mk_inclass (aT axS, c); 

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1498  217 
val intro_axm = Logic.list_implies 
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(map inclass super_classes @ map (int_axm o snd) axioms, inclass class); 
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in 
3764  220 
Theory.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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3788  226 
val add_axclass = ext_axclass true read_axm; 
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val add_axclass_i = ext_axclass false cert_axm; 

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423  231 
(** 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 
1217  240 
map (class_triv thy) classes @ 
241 
get_axioms thy intros 

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end; 
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423  244 

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(* axclass_tac *) 

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(*(1) repeatedly resolve goals of form "OFCLASS(ty, c_class)", 
1217  248 
try class_trivs first, then "cI" axioms 
423  249 
(2) rewrite goals using user supplied definitions 
250 
(3) repeatedly resolve goals with user supplied nondefinitions*) 

251 

252 
fun axclass_tac thy thms = 

1217  253 
let 
254 
val defs = filter is_def thms; 

255 
val non_defs = filter_out is_def thms; 

256 
in 

257 
TRY (REPEAT_FIRST (resolve_tac (class_axms thy))) THEN 

258 
TRY (rewrite_goals_tac defs) THEN 

259 
TRY (REPEAT_FIRST (fn i => assume_tac i ORELSE resolve_tac non_defs i)) 

260 
end; 

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423  263 
(* provers *) 
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423  265 
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; 
423  268 
val goal = cterm_of sign (term_of sig_prop); 
269 
val tac = axclass_tac thy thms THEN (if_none usr_tac all_tac); 

270 
in 

271 
prove_goalw_cterm [] goal (K [tac]) 

272 
end 

273 
handle ERROR => error ("The error(s) above occurred while trying to prove " 

274 
^ quote (str_of sig_prop)); 

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val prove_subclass = 
423  277 
prove mk_classrel (fn (c1, c2) => c1 ^ " < " ^ c2); 
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423  279 
val prove_arity = 
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prove mk_arity (fn (t, ss, c) => Sorts.str_of_arity (t, ss, [c])); 
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423  283 
(* make goals (for interactive use) *) 
284 

285 
fun mk_goal term_of thy sig_prop = 

286 
goalw_cterm [] (cterm_of (sign_of thy) (term_of sig_prop)); 

287 

288 
val goal_subclass = mk_goal mk_classrel; 

289 
val goal_arity = mk_goal mk_arity; 

290 

291 

292 

449  293 
(** add proved subclass relations and arities **) 
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3788  295 
fun ext_inst_subclass int raw_c1_c2 axms thms usr_tac thy = 
296 
let 

297 
val intrn = if int then pairself (Sign.intern_class (sign_of thy)) else I; 

298 
val c1_c2 = intrn raw_c1_c2; 

299 
in 

300 
writeln ("Proving class inclusion " ^ quote (Sorts.str_of_classrel c1_c2) ^ " ..."); 

301 
add_classrel_thms 

302 
[prove_subclass thy c1_c2 (witnesses thy axms thms) usr_tac] thy 

303 
end; 

423  304 

3788  305 

306 
fun ext_inst_arity int (raw_t, raw_Ss, raw_cs) axms thms usr_tac thy = 

423  307 
let 
3788  308 
val sign = sign_of thy; 
309 
val (t, Ss, cs) = 

310 
if int then 

311 
(Sign.intern_tycon sign raw_t, 

312 
map (Sign.intern_sort sign) raw_Ss, 

313 
map (Sign.intern_class sign) raw_cs) 

314 
else (raw_t, raw_Ss, raw_cs); 

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val wthms = witnesses thy axms thms; 
423  316 
fun prove c = 
3788  317 
(writeln ("Proving type arity " ^ quote (Sorts.str_of_arity (t, Ss, [c])) ^ " ..."); 
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prove_arity thy (t, Ss, c) wthms usr_tac); 

423  319 
in 
320 
add_arity_thms (map prove cs) thy 

321 
end; 

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3788  323 
val add_inst_subclass = ext_inst_subclass true; 
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val add_inst_subclass_i = ext_inst_subclass false; 

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val add_inst_arity = ext_inst_arity true; 

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val add_inst_arity_i = ext_inst_arity false; 

327 

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end; 