author  wenzelm 
Tue, 12 Feb 2002 20:28:27 +0100  
changeset 12876  a70df1e5bf10 
parent 12694  9950c1ce9d24 
child 14605  9de4d64eee3b 
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 
11539  4 
License: GPL (GNU GENERAL PUBLIC LICENSE) 
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6379  6 
Axiomatic type class package. 
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*) 
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signature AX_CLASS = 
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sig 
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val quiet_mode: bool ref 
6379  12 
val print_axclasses: theory > unit 
1498  13 
val add_classrel_thms: thm list > theory > theory 
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val add_arity_thms: thm list > theory > theory 

6379  15 
val add_axclass: bclass * xclass list > ((bstring * string) * Args.src list) list 
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> theory > theory * {intro: thm, axioms: thm list} 

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val add_axclass_i: bclass * class list > ((bstring * term) * theory attribute list) list 

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> theory > theory * {intro: thm, axioms: thm list} 

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val add_inst_subclass_x: xclass * xclass > string list > thm list 
3788  20 
> tactic option > theory > theory 
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val add_inst_subclass: xclass * xclass > tactic > theory > theory 
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val add_inst_subclass_i: class * class > tactic > theory > theory 

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val add_inst_arity_x: xstring * string list * string > string list 

3938  24 
> thm list > tactic option > theory > theory 
11828  25 
val add_inst_arity: xstring * string list * string > tactic > theory > theory 
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val add_inst_arity_i: string * sort list * sort > tactic > theory > theory 

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val default_intro_classes_tac: thm list > int > tactic 
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val axclass_tac: thm list > tactic 
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val instance_subclass_proof: xclass * xclass > bool > theory > ProofHistory.T 
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val instance_subclass_proof_i: class * class > bool > theory > ProofHistory.T 
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val instance_arity_proof: xstring * string list * xclass > bool > theory > ProofHistory.T 
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val instance_arity_proof_i: string * sort list * class > bool > theory > ProofHistory.T 
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val setup: (theory > theory) list 
3938  34 
end; 
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1498  36 
structure AxClass : AX_CLASS = 
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struct 
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4015  39 

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(** utilities **) 
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5685  42 
(* messages *) 
43 

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val quiet_mode = ref false; 

45 
fun message s = if ! quiet_mode then () else writeln s; 

46 

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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  58 
fun dest_varT (TFree (x, S)) = ((x, ~1), S) 
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 dest_varT (TVar xi_S) = xi_S 

3788  60 
 dest_varT T = raise TYPE ("dest_varT", [T], []); 
3395  61 

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(* get axioms and theorems *) 
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val is_def = Logic.is_equals o #prop o rep_thm; 
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fun witnesses thy names thms = 
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PureThy.get_thmss thy names @ thms @ filter is_def (map snd (axioms_of thy)); 
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(** abstract syntax operations **) 
423  73 

6379  74 
(* names *) 
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fun intro_name c = c ^ "I"; 

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val introN = "intro"; 

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val axiomsN = "axioms"; 

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(* subclass relations as terms *) 
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1498  83 
fun mk_classrel (c1, c2) = Logic.mk_inclass (aT [c1], c2); 
423  84 

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fun dest_classrel tm = 

86 
let 

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fun err () = raise TERM ("dest_classrel", [tm]); 
423  88 

3395  89 
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 (); 

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in (c1, c2) end; 
423  93 

94 

95 
(* arities as terms *) 

96 

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fun mk_arity (t, ss, c) = 

98 
let 

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val tfrees = ListPair.map TFree (Term.invent_type_names [] (length ss), ss); 
6379  100 
in Logic.mk_inclass (Type (t, tfrees), c) end; 
423  101 

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fun dest_arity tm = 

103 
let 

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fun err () = raise TERM ("dest_arity", [tm]); 
423  105 

3395  106 
val (ty, c) = Logic.dest_inclass tm handle TERM _ => err (); 
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val (t, tvars) = 

423  108 
(case ty of 
3395  109 
Type (t, tys) => (t, map dest_varT tys handle TYPE _ => err ()) 
423  110 
 _ => err ()); 
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val ss = 

3395  112 
if null (gen_duplicates eq_fst tvars) 
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then map snd tvars else err (); 

6379  114 
in (t, ss, c) end; 
423  115 

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560  118 
(** add theorems as axioms **) 
423  119 

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fun prep_thm_axm thy thm = 

121 
let 

122 
fun err msg = raise THM ("prep_thm_axm: " ^ msg, 0, [thm]); 

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1237  124 
val {sign, hyps, prop, ...} = rep_thm thm; 
423  125 
in 
6390  126 
if not (Sign.subsig (sign, Theory.sign_of thy)) then 
423  127 
err "theorem not of same theory" 
1237  128 
else if not (null (extra_shyps thm)) orelse not (null hyps) then 
423  129 
err "theorem may not contain hypotheses" 
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else prop 

131 
end; 

132 

133 
(*theorems expressing class relations*) 

134 
fun add_classrel_thms thms thy = 

135 
let 

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fun prep_thm thm = 

137 
let 

138 
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; 

8897  142 
in Theory.add_classrel_i (map prep_thm thms) thy end; 
423  143 

144 
(*theorems expressing arities*) 

145 
fun add_arity_thms thms thy = 

146 
let 

147 
fun prep_thm thm = 

148 
let 

149 
val prop = prep_thm_axm thy thm; 

150 
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; 

8897  153 
in Theory.add_arities_i (map prep_thm thms) thy end; 
6379  154 

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(** axclass info **) 

158 

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(* data kind 'Pure/axclasses' *) 

160 

161 
type axclass_info = 

162 
{super_classes: class list, 

163 
intro: thm, 

164 
axioms: thm list}; 

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166 
structure AxclassesArgs = 

167 
struct 

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val name = "Pure/axclasses"; 

169 
type T = axclass_info Symtab.table; 

170 

171 
val empty = Symtab.empty; 

6546  172 
val copy = I; 
6379  173 
val prep_ext = I; 
174 
fun merge (tab1, tab2) = Symtab.merge (K true) (tab1, tab2); 

175 

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fun print sg tab = 

177 
let 

178 
val ext_class = Sign.cond_extern sg Sign.classK; 

179 
val ext_thm = PureThy.cond_extern_thm_sg sg; 

180 

181 
fun pretty_class c cs = Pretty.block 

182 
(Pretty.str (ext_class c) :: Pretty.str " <" :: Pretty.brk 1 :: 

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Pretty.breaks (map (Pretty.str o ext_class) cs)); 

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10008  185 
fun pretty_thms name thms = Pretty.big_list (name ^ ":") 
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(map (Display.pretty_thm_sg sg) thms); 

6379  187 

188 
fun pretty_axclass (name, {super_classes, intro, axioms}) = Pretty.block (Pretty.fbreaks 

189 
[pretty_class name super_classes, pretty_thms introN [intro], pretty_thms axiomsN axioms]); 

8720  190 
in Pretty.writeln (Pretty.chunks (map pretty_axclass (Symtab.dest tab))) end; 
6379  191 
end; 
192 

193 
structure AxclassesData = TheoryDataFun(AxclassesArgs); 

194 
val print_axclasses = AxclassesData.print; 

195 

196 

197 
(* get and put data *) 

198 

199 
fun lookup_axclass_info_sg sg c = Symtab.lookup (AxclassesData.get_sg sg, c); 

200 

201 
fun get_axclass_info thy c = 

202 
(case lookup_axclass_info_sg (Theory.sign_of thy) c of 

203 
None => error ("Unknown axclass " ^ quote c) 

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 Some info => info); 

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206 
fun put_axclass_info c info thy = 

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thy > AxclassesData.put (Symtab.update ((c, info), AxclassesData.get thy)); 

423  208 

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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 " ^ quote logicC); 
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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_class prep_axm prep_att (bclass, raw_super_classes) raw_axioms_atts thy = 
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let 
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val sign = Theory.sign_of thy; 
3938  230 

6379  231 
val class = Sign.full_name sign bclass; 
232 
val super_classes = map (prep_class sign) raw_super_classes; 

233 
val axms = map (prep_axm sign o fst) raw_axioms_atts; 

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val atts = map (map (prep_att thy) o snd) raw_axioms_atts; 

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6379  236 
(*declare class*) 
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val class_thy = 

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thy > Theory.add_classes_i [(bclass, super_classes)]; 

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val class_sign = Theory.sign_of class_thy; 

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6379  241 
(*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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Logic.mk_implies (Logic.mk_inclass (aT logicS, class), ax) 
3788  245 
else map_term_tfrees (K (aT [class])) ax; 
6379  246 
val abs_axms = map (abs_axm o #2) axms; 
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6379  248 
(*prepare introduction rule*) 
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val _ = if Sign.subsort class_sign ([class], logicS) then () 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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[] => [] 
6379  254 
 [(_, S)] => if Sign.subsort class_sign ([class], S) then S else err_bad_axsort name class 
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 _ => err_bad_tfrees name); 
6379  256 
val axS = Sign.norm_sort class_sign (logicC :: flat (map axm_sort axms)); 
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1498  258 
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  261 
val intro_axm = Logic.list_implies 
6379  262 
(map inclass super_classes @ map (int_axm o #2) axms, inclass class); 
263 

264 
(*declare axioms and rule*) 

8420  265 
val (axms_thy, ([intro], [axioms])) = 
6379  266 
class_thy 
267 
> Theory.add_path bclass 

268 
> PureThy.add_axioms_i [Thm.no_attributes (introN, intro_axm)] 

8420  269 
>>> PureThy.add_axiomss_i [Thm.no_attributes (axiomsN, abs_axms)]; 
6379  270 
val info = {super_classes = super_classes, intro = intro, axioms = axioms}; 
271 

272 
(*store info*) 

273 
val final_thy = 

274 
axms_thy 

8420  275 
> (#1 o PureThy.add_thms ((map #1 axms ~~ axioms) ~~ atts)) 
6379  276 
> Theory.parent_path 
8420  277 
> (#1 o PureThy.add_thms [Thm.no_attributes (intro_name bclass, intro)]) 
6379  278 
> put_axclass_info class info; 
279 
in (final_thy, {intro = intro, axioms = axioms}) end; 

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(* external interfaces *) 
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6390  284 
val add_axclass = ext_axclass Sign.intern_class Theory.read_axm Attrib.global_attribute; 
285 
val add_axclass_i = ext_axclass (K I) Theory.cert_axm (K I); 

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423  289 
(** prove class relations and type arities **) 
290 

291 
(* class_axms *) 

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6379  293 
fun class_axms sign = 
294 
let val classes = Sign.classes sign in 

295 
map (Thm.class_triv sign) classes @ 

296 
mapfilter (apsome #intro o lookup_axclass_info_sg sign) classes 

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end; 
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423  299 

7351  300 
(* intro_classes *) 
6379  301 

10309  302 
fun intro_classes_tac facts i st = 
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((Method.insert_tac facts THEN' 
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REPEAT_ALL_NEW (resolve_tac (class_axms (Thm.sign_of_thm st)))) i 
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THEN Tactic.distinct_subgoals_tac) st; (*affects all subgoals!?*) 
6379  306 

7351  307 
val intro_classes_method = 
10309  308 
("intro_classes", Method.no_args (Method.METHOD (HEADGOAL o intro_classes_tac)), 
7351  309 
"backchain introduction rules of axiomatic type classes"); 
6379  310 

311 

10309  312 
(* default method *) 
313 

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fun default_intro_classes_tac [] i = intro_classes_tac [] i 
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default_intro_classes_tac: Tactic.distinct_subgoals_tac;
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 default_intro_classes_tac _ _ = Tactical.no_tac; (*no error message!*) 
10309  316 

317 
fun default_tac rules ctxt facts = 

318 
HEADGOAL (Method.some_rule_tac rules ctxt facts ORELSE' default_intro_classes_tac facts); 

319 

320 
val default_method = 

12371  321 
("default", Method.thms_ctxt_args (Method.METHOD oo default_tac), "apply some intro/elim rule"); 
10309  322 

323 

423  324 
(* axclass_tac *) 
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(*(1) repeatedly resolve goals of form "OFCLASS(ty, c_class)", 
1217  327 
try class_trivs first, then "cI" axioms 
423  328 
(2) rewrite goals using user supplied definitions 
329 
(3) repeatedly resolve goals with user supplied nondefinitions*) 

330 

6379  331 
fun axclass_tac thms = 
1217  332 
let 
333 
val defs = filter is_def thms; 

334 
val non_defs = filter_out is_def thms; 

335 
in 

10309  336 
HEADGOAL (intro_classes_tac []) THEN 
1217  337 
TRY (rewrite_goals_tac defs) THEN 
338 
TRY (REPEAT_FIRST (fn i => assume_tac i ORELSE resolve_tac non_defs i)) 

339 
end; 

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340 

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341 

423  342 
(* provers *) 
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11969  344 
fun prove mk_prop str_of sign prop thms usr_tac = 
345 
(Tactic.prove sign [] [] (mk_prop prop) (K (axclass_tac thms THEN (if_none usr_tac all_tac))) 

346 
handle ERROR => error ("The error(s) above occurred while trying to prove " ^ 

347 
quote (str_of sign prop))) > Drule.standard; 

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638  349 
val prove_subclass = 
11969  350 
prove mk_classrel (fn sg => fn c1_c2 => Sign.str_of_classrel sg c1_c2); 
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423  352 
val prove_arity = 
11969  353 
prove mk_arity (fn sg => fn (t, Ss, c) => Sign.str_of_arity sg (t, Ss, [c])); 
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354 

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423  356 

449  357 
(** add proved subclass relations and arities **) 
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8897  359 
(* prepare classes and arities *) 
360 

361 
fun read_class sg c = Sign.certify_class sg (Sign.intern_class sg c); 

362 

363 
fun cert_classrel sg cc = Library.pairself (Sign.certify_class sg) cc; 

364 
fun read_classrel sg cc = Library.pairself (read_class sg) cc; 

3949  365 

8897  366 
fun check_tycon sg t = 
367 
let val {tycons, abbrs, ...} = Type.rep_tsig (Sign.tsig_of sg) in 

368 
if is_some (Symtab.lookup (abbrs, t)) then 

369 
error ("Illegal type abbreviation: " ^ quote t) 

370 
else if is_none (Symtab.lookup (tycons, t)) then 

371 
error ("Undeclared type constructor: " ^ quote t) 

372 
else t 

8716  373 
end; 
6379  374 

8897  375 
fun prep_arity prep_tycon prep_sort prep_x sg (t, Ss, x) = 
376 
(check_tycon sg (prep_tycon sg t), map (prep_sort sg) Ss, prep_x sg x); 

377 

378 
val read_arity = prep_arity Sign.intern_tycon Sign.read_sort Sign.read_sort; 

379 
val cert_arity = prep_arity (K I) Sign.certify_sort Sign.certify_sort; 

380 
val read_simple_arity = prep_arity Sign.intern_tycon Sign.read_sort Sign.intern_class; 

8927  381 
fun cert_simple_arity arg = prep_arity (K I) Sign.certify_sort (K I) arg; 
8897  382 

383 

384 
(* oldstyle instance declarations *) 

6379  385 

386 
fun ext_inst_subclass prep_classrel raw_c1_c2 names thms usr_tac thy = 

11969  387 
let 
388 
val sign = Theory.sign_of thy; 

389 
val c1_c2 = prep_classrel sign raw_c1_c2; 

390 
in 

391 
message ("Proving class inclusion " ^ quote (Sign.str_of_classrel sign c1_c2) ^ " ..."); 

392 
thy > add_classrel_thms [prove_subclass sign c1_c2 (witnesses thy names thms) usr_tac] 

3788  393 
end; 
423  394 

6379  395 
fun ext_inst_arity prep_arity (raw_t, raw_Ss, raw_cs) names thms usr_tac thy = 
423  396 
let 
6379  397 
val sign = Theory.sign_of thy; 
398 
val (t, Ss, cs) = prep_arity sign (raw_t, raw_Ss, raw_cs); 

4934  399 
val wthms = witnesses thy names thms; 
423  400 
fun prove c = 
5685  401 
(message ("Proving type arity " ^ 
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quote (Sign.str_of_arity sign (t, Ss, [c])) ^ " ..."); 
11969  403 
prove_arity sign (t, Ss, c) wthms usr_tac); 
6379  404 
in add_arity_thms (map prove cs) thy end; 
405 

11828  406 
fun sane_inst_subclass prep sub tac = ext_inst_subclass prep sub [] [] (Some tac); 
407 
fun sane_inst_arity prep arity tac = ext_inst_arity prep arity [] [] (Some tac); 

6379  408 

11828  409 
val add_inst_subclass_x = ext_inst_subclass read_classrel; 
410 
val add_inst_subclass = sane_inst_subclass read_classrel; 

411 
val add_inst_subclass_i = sane_inst_subclass cert_classrel; 

412 
val add_inst_arity_x = ext_inst_arity read_arity; 

413 
val add_inst_arity = sane_inst_arity read_arity; 

414 
val add_inst_arity_i = sane_inst_arity cert_arity; 

6379  415 

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6379  418 
(** instance proof interfaces **) 
419 

420 
fun inst_attribute add_thms (thy, thm) = (add_thms [thm] thy, thm); 

421 

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fun inst_proof mk_prop add_thms sig_prop int thy = 
6379  423 
thy 
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> IsarThy.theorem_i Drule.internalK (("", [inst_attribute add_thms]), 
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(mk_prop (Theory.sign_of thy) sig_prop, ([], []))) int; 
3949  426 

8897  427 
val instance_subclass_proof = inst_proof (mk_classrel oo read_classrel) add_classrel_thms; 
428 
val instance_subclass_proof_i = inst_proof (mk_classrel oo cert_classrel) add_classrel_thms; 

429 
val instance_arity_proof = inst_proof (mk_arity oo read_simple_arity) add_arity_thms; 

430 
val instance_arity_proof_i = inst_proof (mk_arity oo cert_simple_arity) add_arity_thms; 

6379  431 

432 

433 

434 
(** package setup **) 

435 

436 
(* setup theory *) 

3949  437 

6379  438 
val setup = 
439 
[AxclassesData.init, 

10309  440 
Method.add_methods [intro_classes_method, default_method]]; 
6379  441 

442 

443 
(* outer syntax *) 

444 

6719  445 
local structure P = OuterParse and K = OuterSyntax.Keyword in 
3949  446 

6379  447 
val axclassP = 
6719  448 
OuterSyntax.command "axclass" "define axiomatic type class" K.thy_decl 
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((P.name  Scan.optional ((P.$$$ "\\<subseteq>"  P.$$$ "<")  
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450 
P.!!! (P.list1 P.xname)) [])  Scan.repeat P.spec_name 
6379  451 
>> (fn (cls, axs) => Toplevel.theory (#1 o add_axclass cls axs))); 
452 

453 
val instanceP = 

6719  454 
OuterSyntax.command "instance" "prove type arity or subclass relation" K.thy_goal 
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455 
((P.xname  ((P.$$$ "\\<subseteq>"  P.$$$ "<")  P.xname) >> instance_subclass_proof  
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456 
(P.xname  (P.$$$ "::"  P.simple_arity) >> P.triple2) >> instance_arity_proof) 
6379  457 
>> (Toplevel.print oo Toplevel.theory_to_proof)); 
458 

459 
val _ = OuterSyntax.add_parsers [axclassP, instanceP]; 

460 

461 
end; 

3949  462 

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463 
end; 