src/Pure/Isar/theory_target.ML
author wenzelm
Thu Nov 19 14:44:22 2009 +0100 (2009-11-19)
changeset 33764 7bcefaab8d41
parent 33724 5ee13e0428d2
child 35127 5b29c1660047
permissions -rw-r--r--
Local_Theory.define: eliminated slightly odd kind argument -- such low-level definitions should be hardly ever exposed to end-users anyway;
     1 (*  Title:      Pure/Isar/theory_target.ML
     2     Author:     Makarius
     3     Author:     Florian Haftmann, TU Muenchen
     4 
     5 Common theory/locale/class/instantiation/overloading targets.
     6 *)
     7 
     8 signature THEORY_TARGET =
     9 sig
    10   val peek: local_theory -> {target: string, is_locale: bool,
    11     is_class: bool, instantiation: string list * (string * sort) list * sort,
    12     overloading: (string * (string * typ) * bool) list}
    13   val init: string option -> theory -> local_theory
    14   val begin: string -> Proof.context -> local_theory
    15   val context: xstring -> theory -> local_theory
    16   val instantiation: string list * (string * sort) list * sort -> theory -> local_theory
    17   val instantiation_cmd: xstring list * xstring list * xstring -> theory -> local_theory
    18   val overloading: (string * (string * typ) * bool) list -> theory -> local_theory
    19   val overloading_cmd: (string * string * bool) list -> theory -> local_theory
    20 end;
    21 
    22 structure Theory_Target: THEORY_TARGET =
    23 struct
    24 
    25 (* context data *)
    26 
    27 datatype target = Target of {target: string, is_locale: bool,
    28   is_class: bool, instantiation: string list * (string * sort) list * sort,
    29   overloading: (string * (string * typ) * bool) list};
    30 
    31 fun make_target target is_locale is_class instantiation overloading =
    32   Target {target = target, is_locale = is_locale,
    33     is_class = is_class, instantiation = instantiation, overloading = overloading};
    34 
    35 val global_target = make_target "" false false ([], [], []) [];
    36 
    37 structure Data = Proof_Data
    38 (
    39   type T = target;
    40   fun init _ = global_target;
    41 );
    42 
    43 val peek = (fn Target args => args) o Data.get;
    44 
    45 
    46 (* pretty *)
    47 
    48 fun pretty_thy ctxt target is_class =
    49   let
    50     val thy = ProofContext.theory_of ctxt;
    51     val target_name = (if is_class then "class " else "locale ") ^ Locale.extern thy target;
    52     val fixes =
    53       map (fn (x, T) => (Binding.name x, SOME T, NoSyn)) (#1 (ProofContext.inferred_fixes ctxt));
    54     val assumes =
    55       map (fn A => (Attrib.empty_binding, [(Thm.term_of A, [])])) (Assumption.all_assms_of ctxt);
    56     val elems =
    57       (if null fixes then [] else [Element.Fixes fixes]) @
    58       (if null assumes then [] else [Element.Assumes assumes]);
    59   in
    60     if target = "" then []
    61     else if null elems then [Pretty.str target_name]
    62     else [Pretty.big_list (target_name ^ " =")
    63       (map (Pretty.chunks o Element.pretty_ctxt ctxt) elems)]
    64   end;
    65 
    66 fun pretty (Target {target, is_class, instantiation, overloading, ...}) ctxt =
    67   Pretty.block [Pretty.str "theory", Pretty.brk 1,
    68       Pretty.str (Context.theory_name (ProofContext.theory_of ctxt))] ::
    69     (if not (null overloading) then [Overloading.pretty ctxt]
    70      else if not (null (#1 instantiation)) then [Class_Target.pretty_instantiation ctxt]
    71      else pretty_thy ctxt target is_class);
    72 
    73 
    74 (* generic declarations *)
    75 
    76 local
    77 
    78 fun direct_decl decl =
    79   let val decl0 = Morphism.form decl in
    80     Local_Theory.theory (Context.theory_map decl0) #>
    81     Local_Theory.target (Context.proof_map decl0)
    82   end;
    83 
    84 fun target_decl add (Target {target, ...}) pervasive decl lthy =
    85   let
    86     val global_decl = Morphism.transform (Local_Theory.global_morphism lthy) decl;
    87     val target_decl = Morphism.transform (Local_Theory.target_morphism lthy) decl;
    88   in
    89     if target = "" then
    90       lthy
    91       |> direct_decl target_decl
    92     else
    93       lthy
    94       |> pervasive ? direct_decl global_decl
    95       |> Local_Theory.target (add target target_decl)
    96   end;
    97 
    98 in
    99 
   100 val type_syntax = target_decl Locale.add_type_syntax;
   101 val term_syntax = target_decl Locale.add_term_syntax;
   102 val declaration = target_decl Locale.add_declaration;
   103 
   104 end;
   105 
   106 fun class_target (Target {target, ...}) f =
   107   Local_Theory.raw_theory f #>
   108   Local_Theory.target (Class_Target.refresh_syntax target);
   109 
   110 
   111 (* notes *)
   112 
   113 fun import_export_proof ctxt (name, raw_th) =
   114   let
   115     val thy = ProofContext.theory_of ctxt;
   116     val thy_ctxt = ProofContext.init thy;
   117     val certT = Thm.ctyp_of thy;
   118     val cert = Thm.cterm_of thy;
   119 
   120     (*export assumes/defines*)
   121     val th = Goal.norm_result raw_th;
   122     val (defs, th') = LocalDefs.export ctxt thy_ctxt th;
   123     val concl_conv = MetaSimplifier.rewrite true defs (Thm.cprop_of th);
   124     val assms = map (MetaSimplifier.rewrite_rule defs o Thm.assume) (Assumption.all_assms_of ctxt);
   125     val nprems = Thm.nprems_of th' - Thm.nprems_of th;
   126 
   127     (*export fixes*)
   128     val tfrees = map TFree (Thm.fold_terms Term.add_tfrees th' []);
   129     val frees = map Free (Thm.fold_terms Term.add_frees th' []);
   130     val (th'' :: vs) = (th' :: map (Drule.mk_term o cert) (map Logic.mk_type tfrees @ frees))
   131       |> Variable.export ctxt thy_ctxt
   132       |> Drule.zero_var_indexes_list;
   133 
   134     (*thm definition*)
   135     val result = PureThy.name_thm true true name th'';
   136 
   137     (*import fixes*)
   138     val (tvars, vars) =
   139       chop (length tfrees) (map (Thm.term_of o Drule.dest_term) vs)
   140       |>> map Logic.dest_type;
   141 
   142     val instT = map_filter (fn (TVar v, T) => SOME (v, T) | _ => NONE) (tvars ~~ tfrees);
   143     val inst = filter (is_Var o fst) (vars ~~ frees);
   144     val cinstT = map (pairself certT o apfst TVar) instT;
   145     val cinst = map (pairself (cert o Term.map_types (Term_Subst.instantiateT instT))) inst;
   146     val result' = Thm.instantiate (cinstT, cinst) result;
   147 
   148     (*import assumes/defines*)
   149     val assm_tac = FIRST' (map (fn assm => Tactic.compose_tac (false, assm, 0)) assms);
   150     val result'' =
   151       (case SINGLE (Seq.INTERVAL assm_tac 1 nprems) result' of
   152         NONE => raise THM ("Failed to re-import result", 0, [result'])
   153       | SOME res => LocalDefs.trans_props ctxt [res, Thm.symmetric concl_conv])
   154       |> Goal.norm_result
   155       |> PureThy.name_thm false false name;
   156 
   157   in (result'', result) end;
   158 
   159 fun notes (Target {target, is_locale, ...}) kind facts lthy =
   160   let
   161     val thy = ProofContext.theory_of lthy;
   162     val facts' = facts
   163       |> map (fn (a, bs) => (a, PureThy.burrow_fact (PureThy.name_multi
   164           (Local_Theory.full_name lthy (fst a))) bs))
   165       |> PureThy.map_facts (import_export_proof lthy);
   166     val local_facts = PureThy.map_facts #1 facts'
   167       |> Attrib.map_facts (Attrib.attribute_i thy);
   168     val target_facts = PureThy.map_facts #1 facts'
   169       |> is_locale ? Element.facts_map (Element.morph_ctxt (Local_Theory.target_morphism lthy));
   170     val global_facts = PureThy.map_facts #2 facts'
   171       |> Attrib.map_facts (if is_locale then K I else Attrib.attribute_i thy);
   172   in
   173     lthy
   174     |> Local_Theory.theory (PureThy.note_thmss kind global_facts #> snd)
   175     |> not is_locale ? Local_Theory.target (ProofContext.note_thmss kind global_facts #> snd)
   176     |> is_locale ? Local_Theory.target (Locale.add_thmss target kind target_facts)
   177     |> ProofContext.note_thmss kind local_facts
   178   end;
   179 
   180 
   181 (* declare_const *)
   182 
   183 fun fork_mixfix (Target {is_locale, is_class, ...}) mx =
   184   if not is_locale then (NoSyn, NoSyn, mx)
   185   else if not is_class then (NoSyn, mx, NoSyn)
   186   else (mx, NoSyn, NoSyn);
   187 
   188 fun locale_const (Target {target, is_class, ...}) (prmode as (mode, _)) ((b, mx), rhs) phi =
   189   let
   190     val b' = Morphism.binding phi b;
   191     val rhs' = Morphism.term phi rhs;
   192     val arg = (b', Term.close_schematic_term rhs');
   193     val same_shape = Term.aconv_untyped (rhs, rhs');
   194     (* FIXME workaround based on educated guess *)
   195     val prefix' = Binding.prefix_of b';
   196     val class_global =
   197       Binding.eq_name (b, b') andalso
   198       not (null prefix') andalso
   199       fst (snd (split_last prefix')) = Class_Target.class_prefix target;
   200   in
   201     not (is_class andalso (same_shape orelse class_global)) ?
   202       (Context.mapping_result
   203         (Sign.add_abbrev PrintMode.internal arg)
   204         (ProofContext.add_abbrev PrintMode.internal arg)
   205       #-> (fn (lhs' as Const (d, _), _) =>
   206           same_shape ?
   207             (Context.mapping (Sign.revert_abbrev mode d) (ProofContext.revert_abbrev mode d) #>
   208              Morphism.form (ProofContext.target_notation true prmode [(lhs', mx)]))))
   209   end;
   210 
   211 fun syntax_error c = error ("Illegal mixfix syntax for overloaded constant " ^ quote c);
   212 
   213 fun declare_const (ta as Target {target, is_locale, is_class, ...}) depends ((b, T), mx) lthy =
   214   let
   215     val xs = filter depends (#1 (ProofContext.inferred_fixes (Local_Theory.target_of lthy)));
   216     val U = map #2 xs ---> T;
   217     val (mx1, mx2, mx3) = fork_mixfix ta mx;
   218     val (const, lthy') = lthy |>
   219       (case Class_Target.instantiation_param lthy b of
   220         SOME c' =>
   221           if mx3 <> NoSyn then syntax_error c'
   222           else Local_Theory.theory_result (AxClass.declare_overloaded (c', U))
   223             ##> Class_Target.confirm_declaration b
   224         | NONE =>
   225             (case Overloading.operation lthy b of
   226               SOME (c', _) =>
   227                 if mx3 <> NoSyn then syntax_error c'
   228                 else Local_Theory.theory_result (Overloading.declare (c', U))
   229                   ##> Overloading.confirm b
   230             | NONE => Local_Theory.theory_result (Sign.declare_const ((b, U), mx3))));
   231     val t = Term.list_comb (const, map Free xs);
   232   in
   233     lthy'
   234     |> is_locale ? term_syntax ta false (locale_const ta Syntax.mode_default ((b, mx2), t))
   235     |> is_class ? class_target ta (Class_Target.declare target ((b, mx1), t))
   236     |> LocalDefs.add_def ((b, NoSyn), t)
   237   end;
   238 
   239 
   240 (* abbrev *)
   241 
   242 fun abbrev (ta as Target {target, is_locale, is_class, ...}) prmode ((b, mx), t) lthy =
   243   let
   244     val thy_ctxt = ProofContext.init (ProofContext.theory_of lthy);
   245     val target_ctxt = Local_Theory.target_of lthy;
   246 
   247     val (mx1, mx2, mx3) = fork_mixfix ta mx;
   248     val t' = Assumption.export_term lthy target_ctxt t;
   249     val xs = map Free (rev (Variable.add_fixed target_ctxt t' []));
   250     val u = fold_rev lambda xs t';
   251     val global_rhs =
   252       singleton (Variable.export_terms (Variable.declare_term u target_ctxt) thy_ctxt) u;
   253   in
   254     lthy |>
   255      (if is_locale then
   256         Local_Theory.theory_result (Sign.add_abbrev PrintMode.internal (b, global_rhs))
   257         #-> (fn (lhs, _) =>
   258           let val lhs' = Term.list_comb (Logic.unvarify lhs, xs) in
   259             term_syntax ta false (locale_const ta prmode ((b, mx2), lhs')) #>
   260             is_class ? class_target ta (Class_Target.abbrev target prmode ((b, mx1), t'))
   261           end)
   262       else
   263         Local_Theory.theory
   264           (Sign.add_abbrev (#1 prmode) (b, global_rhs) #-> (fn (lhs, _) =>
   265            Sign.notation true prmode [(lhs, mx3)])))
   266     |> ProofContext.add_abbrev PrintMode.internal (b, t) |> snd
   267     |> LocalDefs.fixed_abbrev ((b, NoSyn), t)
   268   end;
   269 
   270 
   271 (* define *)
   272 
   273 fun define ta ((b, mx), ((name, atts), rhs)) lthy =
   274   let
   275     val thy = ProofContext.theory_of lthy;
   276     val thy_ctxt = ProofContext.init thy;
   277 
   278     val name' = Thm.def_binding_optional b name;
   279     val (rhs', rhs_conv) =
   280       LocalDefs.export_cterm lthy thy_ctxt (Thm.cterm_of thy rhs) |>> Thm.term_of;
   281     val xs = Variable.add_fixed (Local_Theory.target_of lthy) rhs' [];
   282     val T = Term.fastype_of rhs;
   283 
   284     (*const*)
   285     val ((lhs, local_def), lthy2) = lthy |> declare_const ta (member (op =) xs) ((b, T), mx);
   286     val (_, lhs') = Logic.dest_equals (Thm.prop_of local_def);
   287 
   288     (*def*)
   289     val (global_def, lthy3) = lthy2
   290       |> Local_Theory.theory_result
   291         (case Overloading.operation lthy b of
   292           SOME (_, checked) => Overloading.define checked name' (fst (dest_Const lhs'), rhs')
   293         | NONE =>
   294             if is_none (Class_Target.instantiation_param lthy b)
   295             then Thm.add_def false false (name', Logic.mk_equals (lhs', rhs'))
   296             else AxClass.define_overloaded name' (fst (dest_Const lhs'), rhs'));
   297     val def = LocalDefs.trans_terms lthy3
   298       [(*c == global.c xs*)     local_def,
   299        (*global.c xs == rhs'*)  global_def,
   300        (*rhs' == rhs*)          Thm.symmetric rhs_conv];
   301 
   302     (*note*)
   303     val ([(res_name, [res])], lthy4) = lthy3
   304       |> notes ta "" [((name', atts), [([def], [])])];
   305   in ((lhs, (res_name, res)), lthy4) end;
   306 
   307 
   308 (* init *)
   309 
   310 local
   311 
   312 fun init_target _ NONE = global_target
   313   | init_target thy (SOME target) =
   314       if Locale.defined thy (Locale.intern thy target)
   315       then make_target target true (Class_Target.is_class thy target) ([], [], []) []
   316       else error ("No such locale: " ^ quote target);
   317 
   318 fun init_ctxt (Target {target, is_locale, is_class, instantiation, overloading}) =
   319   if not (null (#1 instantiation)) then Class_Target.init_instantiation instantiation
   320   else if not (null overloading) then Overloading.init overloading
   321   else if not is_locale then ProofContext.init
   322   else if not is_class then Locale.init target
   323   else Class_Target.init target;
   324 
   325 fun init_lthy (ta as Target {target, instantiation, overloading, ...}) =
   326   Data.put ta #>
   327   Local_Theory.init NONE (Long_Name.base_name target)
   328    {pretty = pretty ta,
   329     abbrev = abbrev ta,
   330     define = define ta,
   331     notes = notes ta,
   332     type_syntax = type_syntax ta,
   333     term_syntax = term_syntax ta,
   334     declaration = declaration ta,
   335     reinit = fn lthy => init_lthy_ctxt ta (ProofContext.theory_of lthy),
   336     exit = Local_Theory.target_of o
   337       (if not (null (#1 instantiation)) then Class_Target.conclude_instantiation
   338        else if not (null overloading) then Overloading.conclude
   339        else I)}
   340 and init_lthy_ctxt ta = init_lthy ta o init_ctxt ta;
   341 
   342 fun gen_overloading prep_const raw_ops thy =
   343   let
   344     val ctxt = ProofContext.init thy;
   345     val ops = raw_ops |> map (fn (name, const, checked) =>
   346       (name, Term.dest_Const (prep_const ctxt const), checked));
   347   in thy |> init_lthy_ctxt (make_target "" false false ([], [], []) ops) end;
   348 
   349 in
   350 
   351 fun init target thy = init_lthy_ctxt (init_target thy target) thy;
   352 fun begin target ctxt = init_lthy (init_target (ProofContext.theory_of ctxt) (SOME target)) ctxt;
   353 
   354 fun context "-" thy = init NONE thy
   355   | context target thy = init (SOME (Locale.intern thy target)) thy;
   356 
   357 
   358 (* other targets *)
   359 
   360 fun instantiation arities = init_lthy_ctxt (make_target "" false false arities []);
   361 fun instantiation_cmd raw_arities thy =
   362   instantiation (Class_Target.read_multi_arity thy raw_arities) thy;
   363 
   364 val overloading = gen_overloading (fn ctxt => Syntax.check_term ctxt o Const);
   365 val overloading_cmd = gen_overloading Syntax.read_term;
   366 
   367 end;
   368 
   369 end;
   370