src/Pure/Isar/class.ML
author haftmann
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(*  Title:      Pure/Isar/ML
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    Author:     Florian Haftmann, TU Muenchen
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Type classes derived from primitive axclasses and locales - interfaces
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*)
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signature CLASS =
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sig
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  include CLASS_TARGET
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    (*FIXME the split in class_target.ML, theory_target.ML and
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      ML is artificial*)
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  val class: bstring -> class list -> Element.context_i list
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    -> theory -> string * Proof.context
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  val class_cmd: bstring -> xstring list -> Element.context list
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    -> theory -> string * Proof.context
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  val prove_subclass: tactic -> class -> local_theory -> local_theory
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  val subclass: class -> local_theory -> Proof.state
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  val subclass_cmd: xstring -> local_theory -> Proof.state
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end;
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structure Class : CLASS =
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struct
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open Class_Target;
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(** rule calculation **)
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fun calculate_axiom thy sups base_sort assm_axiom param_map class =
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  case Old_Locale.intros thy class
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   of (_, []) => assm_axiom
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    | (_, [intro]) =>
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      let
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        fun instantiate thy sort = Thm.instantiate ([pairself (Thm.ctyp_of thy o TVar o pair (Name.aT, 0))
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          (base_sort, sort)], map (fn (v, (c, ty)) => pairself (Thm.cterm_of thy)
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            (Var ((v, 0), map_atyps (fn _ => TVar ((Name.aT, 0), sort)) ty),
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              Const (c, map_atyps (fn _ => TVar ((Name.aT, 0), sort)) ty))) param_map);
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        val axiom_premises = map_filter (fst o rules thy) sups
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          @ the_list assm_axiom;
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      in intro
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        |> instantiate thy [class]
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        |> (fn thm => thm OF axiom_premises)
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        |> Drule.standard'
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        |> Thm.close_derivation
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        |> SOME
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      end;
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fun calculate_rules thy phi sups base_sort param_map axiom class =
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  let
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    fun instantiate thy sort = Thm.instantiate ([pairself (Thm.ctyp_of thy o TVar o pair (Name.aT, 0))
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      (base_sort, sort)], map (fn (v, (c, ty)) => pairself (Thm.cterm_of thy)
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        (Var ((v, 0), map_atyps (fn _ => TVar ((Name.aT, 0), sort)) ty),
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          Const (c, map_atyps (fn _ => TVar ((Name.aT, 0), sort)) ty))) param_map);
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    val defs = these_defs thy sups;
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    val assm_intro = Old_Locale.intros thy class
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      |> fst
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      |> map (instantiate thy base_sort)
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      |> map (MetaSimplifier.rewrite_rule defs)
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      |> map Thm.close_derivation
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      |> try the_single;
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    val fixate = Thm.instantiate
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      (map (pairself (Thm.ctyp_of thy)) [(TVar ((Name.aT, 0), []), TFree (Name.aT, base_sort)),
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        (TVar ((Name.aT, 0), base_sort), TFree (Name.aT, base_sort))], [])
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    val of_class_sups = if null sups
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      then map (fixate o Thm.class_triv thy) base_sort
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      else map (fixate o snd o rules thy) sups;
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    val locale_dests = map Drule.standard' (Old_Locale.dests thy class);
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    val num_trivs = case length locale_dests
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     of 0 => if is_none axiom then 0 else 1
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      | n => n;
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    val pred_trivs = if num_trivs = 0 then []
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      else the axiom
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        |> Thm.prop_of
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        |> (map_types o map_atyps o K) (TFree (Name.aT, base_sort))
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        |> (Thm.assume o Thm.cterm_of thy)
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        |> replicate num_trivs;
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    val axclass_intro = (#intro o AxClass.get_info thy) class;
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    val of_class = (fixate axclass_intro OF of_class_sups OF locale_dests OF pred_trivs)
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      |> Drule.standard'
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      |> Thm.close_derivation;
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  in (assm_intro, of_class) end;
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fun note_assm_intro class assm_intro thy =
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  thy
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  |> Sign.sticky_prefix (class_prefix class ^ "_" ^ AxClass.axiomsN)
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  |> PureThy.store_thm (AxClass.introN, assm_intro)
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  |> snd
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  |> Sign.restore_naming thy;
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(** define classes **)
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local
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fun gen_class_spec prep_class process_expr thy raw_supclasses raw_elems =
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  let
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    val supclasses = map (prep_class thy) raw_supclasses;
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    val supsort = Sign.minimize_sort thy supclasses;
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    val sups = filter (is_class thy) supsort;
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    val supparam_names = map fst (these_params thy sups);
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    val _ = if has_duplicates (op =) supparam_names
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      then error ("Duplicate parameter(s) in superclasses: "
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        ^ (commas o map quote o duplicates (op =)) supparam_names)
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      else ();
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    val base_sort = if null sups then supsort else
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      foldr1 (Sorts.inter_sort (Sign.classes_of thy))
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        (map (base_sort thy) sups);
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    val suplocales = map Old_Locale.Locale sups;
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    val supexpr = Old_Locale.Merge suplocales;
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    val supparams = (map fst o Old_Locale.parameters_of_expr thy) supexpr;
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    val mergeexpr = Old_Locale.Merge suplocales;
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    val constrain = Element.Constrains ((map o apsnd o map_atyps)
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      (K (TFree (Name.aT, base_sort))) supparams);
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    fun fork_syn (Element.Fixes xs) =
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          fold_map (fn (c, ty, syn) => cons (Binding.base_name c, syn) #> pair (c, ty, NoSyn)) xs
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          #>> Element.Fixes
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      | fork_syn x = pair x;
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    fun fork_syntax elems =
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      let
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        val (elems', global_syntax) = fold_map fork_syn elems [];
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      in (constrain :: elems', global_syntax) end;
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    val (elems, global_syntax) =
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      ProofContext.init thy
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      |> Old_Locale.cert_expr supexpr [constrain]
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      |> snd
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      |> begin sups base_sort
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      |> process_expr Old_Locale.empty raw_elems
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      |> fst
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      |> fork_syntax
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  in (((sups, supparams), (supsort, base_sort, mergeexpr)), (elems, global_syntax)) end;
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val read_class_spec = gen_class_spec Sign.intern_class Old_Locale.read_expr;
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val check_class_spec = gen_class_spec (K I) Old_Locale.cert_expr;
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fun add_consts bname class base_sort sups supparams global_syntax thy =
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  let
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    val supconsts = map fst supparams
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      |> AList.make (snd o the o AList.lookup (op =) (these_params thy sups))
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      |> (map o apsnd o apsnd o map_atyps o K o TFree) (Name.aT, [class]);
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    val all_params = map fst (Old_Locale.parameters_of thy class);
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    val raw_params = (snd o chop (length supparams)) all_params;
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    fun add_const (v, raw_ty) thy =
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      let
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        val c = Sign.full_bname thy v;
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        val ty = map_atyps (K (TFree (Name.aT, base_sort))) raw_ty;
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        val ty0 = Type.strip_sorts ty;
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        val ty' = map_atyps (K (TFree (Name.aT, [class]))) ty0;
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        val syn = (the_default NoSyn o AList.lookup (op =) global_syntax) v;
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      in
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        thy
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        |> Sign.declare_const [] ((Binding.name v, ty0), syn)
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        |> snd
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        |> pair ((v, ty), (c, ty'))
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      end;
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  in
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    thy
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    |> Sign.add_path (Logic.const_of_class bname)
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    |> fold_map add_const raw_params
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    ||> Sign.restore_naming thy
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    |-> (fn params => pair (supconsts @ (map o apfst) fst params, params))
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  end;
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fun adjungate_axclass bname class base_sort sups supsort supparams global_syntax thy =
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  let
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    fun globalize param_map = map_aterms
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      (fn Free (v, ty) => Const ((fst o the o AList.lookup (op =) param_map) v, ty)
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        | t => t);
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    val raw_pred = Old_Locale.intros thy class
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      |> fst
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      |> map (Logic.unvarify o Logic.strip_imp_concl o Thm.prop_of);
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    fun get_axiom thy = case (#axioms o AxClass.get_info thy) class
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     of [] => NONE
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      | [thm] => SOME thm;
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  in
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    thy
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    |> add_consts bname class base_sort sups supparams global_syntax
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    |-> (fn (param_map, params) => AxClass.define_class (bname, supsort)
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          (map (fst o snd) params)
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          [((Binding.name (bname ^ "_" ^ AxClass.axiomsN), []), map (globalize param_map) raw_pred)]
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    #> snd
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    #> `get_axiom
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    #-> (fn assm_axiom => fold (Sign.add_const_constraint o apsnd SOME o snd) params
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    #> pair (map (Const o snd) param_map, param_map, params, assm_axiom)))
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  end;
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fun gen_class prep_spec bname raw_supclasses raw_elems thy =
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  let
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    val class = Sign.full_bname thy bname;
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    val (((sups, supparams), (supsort, base_sort, mergeexpr)), (elems, global_syntax)) =
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      prep_spec thy raw_supclasses raw_elems;
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    val supconsts = map (apsnd fst o snd) (these_params thy sups);
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  in
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    thy
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    |> Old_Locale.add_locale "" bname mergeexpr elems
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    |> snd
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    |> ProofContext.theory_of
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    |> adjungate_axclass bname class base_sort sups supsort supparams global_syntax
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    |-> (fn (inst, param_map, params, assm_axiom) =>
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        `(fn thy => calculate_axiom thy sups base_sort assm_axiom param_map class)
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    #-> (fn axiom =>
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        prove_class_interpretation class inst
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          (supconsts @ map (pair class o fst o snd) params) (the_list axiom) []
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    #-> (fn morphism =>
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        `(fn thy => activate_class_morphism thy class inst morphism)
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    #-> (fn phi =>
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        `(fn thy => calculate_rules thy phi sups base_sort param_map axiom class)
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    #-> (fn (assm_intro, of_class) =>
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        register class sups params base_sort inst
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          morphism axiom assm_intro of_class
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    #> fold (note_assm_intro class) (the_list assm_intro))))))
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    |> init class
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    |> pair class
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  end;
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in
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val class_cmd = gen_class read_class_spec;
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val class = gen_class check_class_spec;
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end; (*local*)
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(** subclass relations **)
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local
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fun gen_subclass prep_class do_proof raw_sup lthy =
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  let
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    val thy = ProofContext.theory_of lthy;
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    val sup = prep_class thy raw_sup;
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    val sub = case TheoryTarget.peek lthy
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     of {is_class = false, ...} => error "Not a class context"
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      | {target, ...} => target;
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    val _ = if Sign.subsort thy ([sup], [sub])
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      then error ("Class " ^ Syntax.string_of_sort lthy [sup]
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        ^ " is subclass of class " ^ Syntax.string_of_sort lthy [sub])
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      else ();
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    val sub_params = map fst (these_params thy [sub]);
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    val sup_params = map fst (these_params thy [sup]);
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    val err_params = subtract (op =) sub_params sup_params;
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    val _ = if null err_params then [] else
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      error ("Class " ^ Syntax.string_of_sort lthy [sub] ^ " lacks parameter(s) " ^
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        commas_quote err_params ^ " of " ^ Syntax.string_of_sort lthy [sup]);
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    val sublocale_prop =
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      Old_Locale.global_asms_of thy sup
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      |> maps snd
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      |> try the_single
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      |> Option.map (ObjectLogic.ensure_propT thy);
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    fun after_qed some_thm =
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      LocalTheory.theory (prove_subclass_relation (sub, sup) some_thm)
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      #> (TheoryTarget.init (SOME sub) o ProofContext.theory_of);
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  in
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    do_proof after_qed sublocale_prop lthy
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  end;
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fun user_proof after_qed NONE =
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      Proof.theorem_i NONE (K (after_qed NONE)) [[]]
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  | user_proof after_qed (SOME prop) =
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      Proof.theorem_i NONE (after_qed o try the_single o the_single) [[(prop, [])]];
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fun tactic_proof tac after_qed NONE lthy =
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      after_qed NONE lthy
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  | tactic_proof tac after_qed (SOME prop) lthy =
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      after_qed (SOME (Goal.prove (LocalTheory.target_of lthy) [] [] prop
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        (K tac))) lthy;
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in
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val subclass = gen_subclass (K I) user_proof;
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fun prove_subclass tac = gen_subclass (K I) (tactic_proof tac);
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val subclass_cmd = gen_subclass Sign.read_class user_proof;
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end; (*local*)
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end;
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