author  wenzelm 
Tue, 18 Nov 2008 18:25:42 +0100  
changeset 28839  32d498cf7595 
parent 28678  d93980a6c3cb 
child 28965  1de908189869 
permissions  rwrr 
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(* Title: ZF/Tools/datatype_package.ML 
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ID: $Id$ 
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Author: Lawrence C Paulson, Cambridge University Computer Laboratory 

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Copyright 1994 University of Cambridge 

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Datatype/Codatatype Definitions 
6052  7 

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The functor will be instantiated for normal sums/products (datatype defs) 

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and nonstandard sums/products (codatatype defs) 

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Sums are used only for mutual recursion; 

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Products are used only to derive "streamlined" induction rules for relations 

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*) 

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type datatype_result = 

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{con_defs : thm list, (*definitions made in thy*) 

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case_eqns : thm list, (*equations for case operator*) 

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recursor_eqns : thm list, (*equations for the recursor*) 

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free_iffs : thm list, (*freeness rewrite rules*) 

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free_SEs : thm list, (*freeness destruct rules*) 

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mk_free : string > thm}; (*function to make freeness theorems*) 
6052  22 

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signature DATATYPE_ARG = 

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sig 
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val intrs : thm list 
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val elims : thm list 

12183  27 
end; 
6052  28 

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signature DATATYPE_PACKAGE = 

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sig 
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(*Insert definitions for the recursive sets, which 
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must *already* be declared as constants in parent theory!*) 

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val add_datatype_i: term * term list > Ind_Syntax.constructor_spec list list > 
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thm list * thm list * thm list > theory > theory * inductive_result * datatype_result 

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val add_datatype: string * string list > (string * string list * mixfix) list list > 

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(Facts.ref * Attrib.src list) list * (Facts.ref * Attrib.src list) list * 
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(Facts.ref * Attrib.src list) list > theory > theory * inductive_result * datatype_result 
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end; 
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12131  40 
functor Add_datatype_def_Fun 
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(structure Fp: FP and Pr : PR and CP: CARTPROD and Su : SU 
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and Ind_Package : INDUCTIVE_PACKAGE 

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and Datatype_Arg : DATATYPE_ARG 

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val coind : bool): DATATYPE_PACKAGE = 

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struct 
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12183  47 
(*con_ty_lists specifies the constructors in the form (name, prems, mixfix) *) 
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(*univ or quniv constitutes the sum domain for mutual recursion; 
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it is applied to the datatype parameters and to Consts occurring in the 

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definition other than Nat.nat and the datatype sets themselves. 

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FIXME: could insert all constant set expressions, e.g. nat>nat.*) 

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fun data_domain co (rec_tms, con_ty_lists) = 

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let val rec_hds = map head_of rec_tms 

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val dummy = assert_all is_Const rec_hds 

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(fn t => "Datatype set not previously declared as constant: " ^ 

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Syntax.string_of_term_global @{theory IFOL} t); 
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val rec_names = (*nat doesn't have to be added*) 
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@{const_name nat} :: map (#1 o dest_Const) rec_hds 

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val u = if co then @{const QUniv.quniv} else @{const Univ.univ} 

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val cs = (fold o fold) (fn (_, _, _, prems) => prems > (fold o fold_aterms) 

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(fn t as Const (a, _) => if a mem_string rec_names then I else insert (op =) t 

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 _ => I)) con_ty_lists []; 

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in u $ Ind_Syntax.union_params (hd rec_tms, cs) end; 

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12183  66 
fun add_datatype_i (dom_sum, rec_tms) con_ty_lists (monos, type_intrs, type_elims) thy = 
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let 
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val dummy = (*has essential ancestors?*) 

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Theory.requires thy "Datatype_ZF" "(co)datatype definitions"; 
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val rec_hds = map head_of rec_tms; 
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val dummy = assert_all is_Const rec_hds 
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(fn t => "Datatype set not previously declared as constant: " ^ 
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Syntax.string_of_term_global thy t); 
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val rec_names = map (#1 o dest_Const) rec_hds 
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val rec_base_names = map Sign.base_name rec_names 
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val big_rec_base_name = space_implode "_" rec_base_names 

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val thy_path = thy > Sign.add_path big_rec_base_name 
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val big_rec_name = Sign.intern_const thy_path big_rec_base_name; 
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val intr_tms = Ind_Syntax.mk_all_intr_tms thy_path (rec_tms, con_ty_lists); 
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val dummy = 
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writeln ((if coind then "Codatatype" else "Datatype") ^ " definition " ^ quote big_rec_name); 
6052  89 

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val case_varname = "f"; (*name for case variables*) 

91 

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(** Define the constructors **) 

93 

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(*The empty tuple is 0*) 

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fun mk_tuple [] = @{const "0"} 
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 mk_tuple args = foldr1 (fn (t1, t2) => Pr.pair $ t1 $ t2) args; 
6052  97 

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fun mk_inject n k u = BalancedTree.access 
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{left = fn t => Su.inl $ t, right = fn t => Su.inr $ t, init = u} n k; 

6052  100 

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val npart = length rec_names; (*number of mutually recursive parts*) 

102 

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val full_name = Sign.full_name thy_path; 
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(*Make constructor definition; 
6052  107 
kpart is the number of this mutually recursive part*) 
12131  108 
fun mk_con_defs (kpart, con_ty_list) = 
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let val ncon = length con_ty_list (*number of constructors*) 
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fun mk_def (((id,T,syn), name, args, prems), kcon) = 
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(*kcon is index of constructor*) 

24255  112 
PrimitiveDefs.mk_defpair (list_comb (Const (full_name name, T), args), 
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mk_inject npart kpart 
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(mk_inject ncon kcon (mk_tuple args))) 

6052  115 
in ListPair.map mk_def (con_ty_list, 1 upto ncon) end; 
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117 

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(*** Define the case operator ***) 

119 

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(*Combine split terms using case; yields the case operator for one part*) 

12131  121 
fun call_case case_list = 
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let fun call_f (free,[]) = Abs("null", @{typ i}, free) 
12131  123 
 call_f (free,args) = 
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CP.ap_split (foldr1 CP.mk_prod (map (#2 o dest_Free) args)) 

26190  125 
@{typ i} 
12131  126 
free 
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in BalancedTree.make (fn (t1, t2) => Su.elim $ t1 $ t2) (map call_f case_list) end; 
6052  128 

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(** Generating function variables for the case definition 

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Nonidentifiers (e.g. infixes) get a name of the form f_op_nnn. **) 

131 

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(*The function variable for a single constructor*) 

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fun add_case (((_, T, _), name, args, _), (opno, cases)) = 

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if Syntax.is_identifier name then 

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(opno, (Free (case_varname ^ "_" ^ name, T), args) :: cases) 

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else 

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(opno + 1, (Free (case_varname ^ "_op_" ^ string_of_int opno, T), args) 
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:: cases); 
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(*Treatment of a list of constructors, for one part 

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Result adds a list of terms, each a function variable with arguments*) 

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fun add_case_list (con_ty_list, (opno, case_lists)) = 

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let val (opno', case_list) = foldr add_case (opno, []) con_ty_list 
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in (opno', case_list :: case_lists) end; 
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(*Treatment of all parts*) 

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val (_, case_lists) = foldr add_case_list (1,[]) con_ty_lists; 
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(*extract the types of all the variables*) 

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val case_typ = List.concat (map (map (#2 o #1)) con_ty_lists) > @{typ "i => i"}; 
6052  151 

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val case_base_name = big_rec_base_name ^ "_case"; 

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val case_name = full_name case_base_name; 

154 

155 
(*The list of all the function variables*) 

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val case_args = List.concat (map (map #1) case_lists); 
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12131  158 
val case_const = Const (case_name, case_typ); 
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val case_tm = list_comb (case_const, case_args); 
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val case_def = PrimitiveDefs.mk_defpair 
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(case_tm, BalancedTree.make (fn (t1, t2) => Su.elim $ t1 $ t2) (map call_case case_lists)); 
6052  163 

164 

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(** Generating function variables for the recursor definition 

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Nonidentifiers (e.g. infixes) get a name of the form f_op_nnn. **) 

167 

168 
(*a recursive call for x is the application rec`x *) 

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val rec_call = @{const apply} $ Free ("rec", @{typ i}); 
6052  170 

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(*look back down the "case args" (which have been reversed) to 
6052  172 
determine the de Bruijn index*) 
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fun make_rec_call ([], _) arg = error 

12131  174 
"Internal error in datatype (variable name mismatch)" 
175 
 make_rec_call (a::args, i) arg = 

176 
if a = arg then rec_call $ Bound i 

177 
else make_rec_call (args, i+1) arg; 

6052  178 

179 
(*creates one case of the "X_case" definition of the recursor*) 

12131  180 
fun call_recursor ((case_var, case_args), (recursor_var, recursor_args)) = 
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let fun add_abs (Free(a,T), u) = Abs(a,T,u) 
12131  182 
val ncase_args = length case_args 
183 
val bound_args = map Bound ((ncase_args  1) downto 0) 

184 
val rec_args = map (make_rec_call (rev case_args,0)) 

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(List.drop(recursor_args, ncase_args)) 

6052  186 
in 
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foldr add_abs 
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(list_comb (recursor_var, 
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bound_args @ rec_args)) case_args 
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end 
191 

192 
(*Find each recursive argument and add a recursive call for it*) 

193 
fun rec_args [] = [] 

24826  194 
 rec_args ((Const(@{const_name mem},_)$arg$X)::prems) = 
6052  195 
(case head_of X of 
12131  196 
Const(a,_) => (*recursive occurrence?*) 
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if a mem_string rec_names 

198 
then arg :: rec_args prems 

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else rec_args prems 

200 
 _ => rec_args prems) 

201 
 rec_args (_::prems) = rec_args prems; 

6052  202 

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(*Add an argument position for each occurrence of a recursive set. 

204 
Strictly speaking, the recursive arguments are the LAST of the function 

205 
variable, but they all have type "i" anyway*) 

26190  206 
fun add_rec_args args' T = (map (fn _ => @{typ i}) args') > T 
6052  207 

208 
(*Plug in the function variable type needed for the recursor 

209 
as well as the new arguments (recursive calls)*) 

210 
fun rec_ty_elem ((id, T, syn), name, args, prems) = 

12131  211 
let val args' = rec_args prems 
212 
in ((id, add_rec_args args' T, syn), 

213 
name, args @ args', prems) 

6052  214 
end; 
215 

12131  216 
val rec_ty_lists = (map (map rec_ty_elem) con_ty_lists); 
6052  217 

218 
(*Treatment of all parts*) 

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val (_, recursor_lists) = foldr add_case_list (1,[]) rec_ty_lists; 
6052  220 

221 
(*extract the types of all the variables*) 

26190  222 
val recursor_typ = List.concat (map (map (#2 o #1)) rec_ty_lists) > @{typ "i => i"}; 
6052  223 

224 
val recursor_base_name = big_rec_base_name ^ "_rec"; 

225 
val recursor_name = full_name recursor_base_name; 

226 

227 
(*The list of all the function variables*) 

15570  228 
val recursor_args = List.concat (map (map #1) recursor_lists); 
6052  229 

230 
val recursor_tm = 

12131  231 
list_comb (Const (recursor_name, recursor_typ), recursor_args); 
6052  232 

12131  233 
val recursor_cases = map call_recursor 
15570  234 
(List.concat case_lists ~~ List.concat recursor_lists) 
6052  235 

12131  236 
val recursor_def = 
24255  237 
PrimitiveDefs.mk_defpair 
12131  238 
(recursor_tm, 
26189  239 
@{const Univ.Vrecursor} $ 
26190  240 
absfree ("rec", @{typ i}, list_comb (case_const, recursor_cases))); 
6052  241 

242 
(* Build the new theory *) 

243 

12183  244 
val need_recursor = (not coind andalso recursor_typ <> case_typ); 
6052  245 

12131  246 
fun add_recursor thy = 
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if need_recursor then 
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thy > Sign.add_consts_i 
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[(recursor_base_name, recursor_typ, NoSyn)] 
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> (snd o PureThy.add_defs false [Thm.no_attributes recursor_def]) 
6052  251 
else thy; 
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18358  253 
val (con_defs, thy0) = thy_path 
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> Sign.add_consts_i 
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((case_base_name, case_typ, NoSyn) :: 
15570  256 
map #1 (List.concat con_ty_lists)) 
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> PureThy.add_defs false 
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(map Thm.no_attributes 
259 
(case_def :: 

15570  260 
List.concat (ListPair.map mk_con_defs 
12131  261 
(1 upto npart, con_ty_lists)))) 
18358  262 
> add_recursor 
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> Sign.parent_path 
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val intr_names = map (Name.binding o #2) (List.concat con_ty_lists); 
12131  266 
val (thy1, ind_result) = 
12187  267 
thy0 > Ind_Package.add_inductive_i 
268 
false (rec_tms, dom_sum) (map Thm.no_attributes (intr_names ~~ intr_tms)) 

269 
(monos, con_defs, type_intrs @ Datatype_Arg.intrs, type_elims @ Datatype_Arg.elims); 

6052  270 

271 
(**** Now prove the datatype theorems in this theory ****) 

272 

273 

274 
(*** Prove the case theorems ***) 

275 

12131  276 
(*Each equation has the form 
6052  277 
case(f_con1,...,f_conn)(coni(args)) = f_coni(args) *) 
12131  278 
fun mk_case_eqn (((_,T,_), name, args, _), case_free) = 
6052  279 
FOLogic.mk_Trueprop 
280 
(FOLogic.mk_eq 

281 
(case_tm $ 

22578  282 
(list_comb (Const (Sign.intern_const thy1 name,T), 
12131  283 
args)), 
284 
list_comb (case_free, args))); 

6052  285 

26189  286 
val case_trans = hd con_defs RS @{thm def_trans} 
287 
and split_trans = Pr.split_eq RS meta_eq_to_obj_eq RS @{thm trans}; 

6052  288 

17985  289 
fun prove_case_eqn (arg, con_def) = 
20046  290 
Goal.prove_global thy1 [] [] 
17985  291 
(Ind_Syntax.traceIt "next case equation = " thy1 (mk_case_eqn arg)) 
292 
(*Proves a single case equation. Could use simp_tac, but it's slower!*) 

293 
(fn _ => EVERY 

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[rewrite_goals_tac [con_def], 
17985  295 
rtac case_trans 1, 
20046  296 
REPEAT (resolve_tac [refl, split_trans, Su.case_inl RS trans, Su.case_inr RS trans] 1)]); 
6052  297 

26189  298 
val free_iffs = map standard (con_defs RL [@{thm def_swap_iff}]); 
6052  299 

12131  300 
val case_eqns = 
301 
map prove_case_eqn 

15570  302 
(List.concat con_ty_lists ~~ case_args ~~ tl con_defs); 
6052  303 

304 
(*** Prove the recursor theorems ***) 

305 

28678  306 
val recursor_eqns = case try (Thm.get_def thy1) recursor_base_name of 
15531  307 
NONE => (writeln " [ No recursion operator ]"; 
12131  308 
[]) 
15531  309 
 SOME recursor_def => 
6052  310 
let 
12131  311 
(*Replace subterms rec`x (where rec is a Free var) by recursor_tm(x) *) 
24826  312 
fun subst_rec (Const(@{const_name apply},_) $ Free _ $ arg) = recursor_tm $ arg 
12131  313 
 subst_rec tm = 
314 
let val (head, args) = strip_comb tm 

315 
in list_comb (head, map subst_rec args) end; 

6052  316 

12131  317 
(*Each equation has the form 
318 
REC(coni(args)) = f_coni(args, REC(rec_arg), ...) 

319 
where REC = recursor(f_con1,...,f_conn) and rec_arg is a recursive 

320 
constructor argument.*) 

321 
fun mk_recursor_eqn (((_,T,_), name, args, _), recursor_case) = 

322 
FOLogic.mk_Trueprop 

323 
(FOLogic.mk_eq 

324 
(recursor_tm $ 

22578  325 
(list_comb (Const (Sign.intern_const thy1 name,T), 
12131  326 
args)), 
18185  327 
subst_rec (Term.betapplys (recursor_case, args)))); 
6052  328 

24893  329 
val recursor_trans = recursor_def RS @{thm def_Vrecursor} RS trans; 
6052  330 

12131  331 
fun prove_recursor_eqn arg = 
20046  332 
Goal.prove_global thy1 [] [] 
17985  333 
(Ind_Syntax.traceIt "next recursor equation = " thy1 (mk_recursor_eqn arg)) 
334 
(*Proves a single recursor equation.*) 

335 
(fn _ => EVERY 

336 
[rtac recursor_trans 1, 

337 
simp_tac (rank_ss addsimps case_eqns) 1, 

20046  338 
IF_UNSOLVED (simp_tac (rank_ss addsimps tl con_defs) 1)]); 
6052  339 
in 
15570  340 
map prove_recursor_eqn (List.concat con_ty_lists ~~ recursor_cases) 
6052  341 
end 
342 

343 
val constructors = 

344 
map (head_of o #1 o Logic.dest_equals o #prop o rep_thm) (tl con_defs); 

345 

12187  346 
val free_SEs = map standard (Ind_Syntax.mk_free_SEs free_iffs); 
6052  347 

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val {intrs, elim, induct, mutual_induct, ...} = ind_result 
6052  349 

350 
(*Typical theorems have the form ~con1=con2, con1=con2==>False, 

351 
con1(x)=con1(y) ==> x=y, con1(x)=con1(y) <> x=y, etc. *) 

352 
fun mk_free s = 

17985  353 
let val thy = theory_of_thm elim in (*Don't use thy1: it will be stale*) 
24707  354 
Goal.prove_global thy [] [] (Syntax.read_prop_global thy s) 
17985  355 
(fn _ => EVERY 
356 
[rewrite_goals_tac con_defs, 

20046  357 
fast_tac (ZF_cs addSEs free_SEs @ Su.free_SEs) 1]) 
17985  358 
end; 
6052  359 

360 
val simps = case_eqns @ recursor_eqns; 

361 

362 
val dt_info = 

12131  363 
{inductive = true, 
364 
constructors = constructors, 

365 
rec_rewrites = recursor_eqns, 

366 
case_rewrites = case_eqns, 

367 
induct = induct, 

368 
mutual_induct = mutual_induct, 

369 
exhaustion = elim}; 

6052  370 

371 
val con_info = 

372 
{big_rec_name = big_rec_name, 

12131  373 
constructors = constructors, 
6052  374 
(*let primrec handle definition by cases*) 
12131  375 
free_iffs = free_iffs, 
376 
rec_rewrites = (case recursor_eqns of 

377 
[] => case_eqns  _ => recursor_eqns)}; 

6052  378 

379 
(*associate with each constructor the datatype name and rewrites*) 

380 
val con_pairs = map (fn c => (#1 (dest_Const c), con_info)) constructors 

381 

382 
in 

383 
(*Updating theory components: simprules and datatype info*) 

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(thy1 > Sign.add_path big_rec_base_name 
18377  385 
> PureThy.add_thmss 
18728  386 
[(("simps", simps), [Simplifier.simp_add]), 
387 
(("", intrs), [Classical.safe_intro NONE]), 

12187  388 
(("con_defs", con_defs), []), 
389 
(("case_eqns", case_eqns), []), 

390 
(("recursor_eqns", recursor_eqns), []), 

391 
(("free_iffs", free_iffs), []), 

18377  392 
(("free_elims", free_SEs), [])] > snd 
17412  393 
> DatatypesData.map (Symtab.update (big_rec_name, dt_info)) 
394 
> ConstructorsData.map (fold Symtab.update con_pairs) 

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changeset

395 
> Sign.parent_path, 
6052  396 
ind_result, 
397 
{con_defs = con_defs, 

398 
case_eqns = case_eqns, 

399 
recursor_eqns = recursor_eqns, 

400 
free_iffs = free_iffs, 

401 
free_SEs = free_SEs, 

402 
mk_free = mk_free}) 

403 
end; 

404 

17936  405 
fun add_datatype (sdom, srec_tms) scon_ty_lists (raw_monos, raw_type_intrs, raw_type_elims) thy = 
12183  406 
let 
24725  407 
val ctxt = ProofContext.init thy; 
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parents:
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changeset

408 
fun read_is strs = 
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parents:
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diff
changeset

409 
map (Syntax.parse_term ctxt #> TypeInfer.constrain @{typ i}) strs 
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wenzelm
parents:
26939
diff
changeset

410 
> Syntax.check_terms ctxt; 
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eliminated old Sign.read_term/Thm.read_cterm etc.;
wenzelm
parents:
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diff
changeset

411 

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parents:
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diff
changeset

412 
val rec_tms = read_is srec_tms; 
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wenzelm
parents:
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diff
changeset

413 
val con_ty_lists = Ind_Syntax.read_constructs ctxt scon_ty_lists; 
12183  414 
val dom_sum = 
26189  415 
if sdom = "" then data_domain coind (rec_tms, con_ty_lists) 
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parents:
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diff
changeset

416 
else singleton read_is sdom; 
24725  417 
val monos = Attrib.eval_thms ctxt raw_monos; 
418 
val type_intrs = Attrib.eval_thms ctxt raw_type_intrs; 

419 
val type_elims = Attrib.eval_thms ctxt raw_type_elims; 

420 
in add_datatype_i (dom_sum, rec_tms) con_ty_lists (monos, type_intrs, type_elims) thy end; 

421 

12183  422 

423 
(* outer syntax *) 

424 

17057  425 
local structure P = OuterParse and K = OuterKeyword in 
12183  426 

427 
fun mk_datatype ((((dom, dts), monos), type_intrs), type_elims) = 

428 
#1 o add_datatype (dom, map fst dts) (map snd dts) (monos, type_intrs, type_elims); 

429 

430 
val con_decl = 

431 
P.name  Scan.optional (P.$$$ "("  P.list1 P.term  P.$$$ ")") []  P.opt_mixfix 

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changeset

432 
>> P.triple1; 
12183  433 

434 
val datatype_decl = 

25985  435 
(Scan.optional ((P.$$$ "\<subseteq>"  P.$$$ "<=")  P.!!! P.term) "")  
12183  436 
P.and_list1 (P.term  (P.$$$ "="  P.enum1 "" con_decl))  
22101  437 
Scan.optional (P.$$$ "monos"  P.!!! SpecParse.xthms1) []  
438 
Scan.optional (P.$$$ "type_intros"  P.!!! SpecParse.xthms1) []  

439 
Scan.optional (P.$$$ "type_elims"  P.!!! SpecParse.xthms1) [] 

12183  440 
>> (Toplevel.theory o mk_datatype); 
441 

442 
val coind_prefix = if coind then "co" else ""; 

443 

24867  444 
val _ = OuterSyntax.command (coind_prefix ^ "datatype") 
12183  445 
("define " ^ coind_prefix ^ "datatype") K.thy_decl datatype_decl; 
446 

6052  447 
end; 
12183  448 

449 
end; 

15705  450 