src/Pure/Isar/theory_target.ML
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(*  Title:      Pure/Isar/theory_target.ML
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    ID:         $Id$
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    Author:     Makarius
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Common theory targets.
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*)
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signature THEORY_TARGET =
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sig
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  val peek: local_theory -> string option
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  val begin: bstring -> Proof.context -> local_theory
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  val init: xstring option -> theory -> local_theory
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  val init_i: string option -> theory -> local_theory
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  val mapping: xstring option -> (local_theory -> local_theory) -> theory -> Proof.context * theory
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end;
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structure TheoryTarget: THEORY_TARGET =
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struct
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(** locale targets **)
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(* context data *)
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structure Data = ProofDataFun
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(
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  val name = "Isar/theory_target";
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  type T = string option;
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  fun init _ = NONE;
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  fun print _ _ = ();
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);
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val _ = Context.add_setup Data.init;
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val peek = Data.get;
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(* pretty *)
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fun pretty loc ctxt =
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  let
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    val thy = ProofContext.theory_of ctxt;
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    val fixes = map (fn (x, T) => (x, SOME T, NoSyn)) (#1 (ProofContext.inferred_fixes ctxt));
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    val assumes = map (fn A => (("", []), [(A, [])])) (Assumption.assms_of ctxt);
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    val elems =
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      (if null fixes then [] else [Element.Fixes fixes]) @
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      (if null assumes then [] else [Element.Assumes assumes]);
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  in
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    if loc = "" then
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      [Pretty.block
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        [Pretty.str "theory", Pretty.brk 1, Pretty.str (Context.theory_name thy),
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          Pretty.str " =", Pretty.brk 1, ThyInfo.pretty_theory thy]]
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    else if null elems then [Pretty.str ("locale " ^ Locale.extern thy loc)]
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    else
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      [Pretty.big_list ("locale " ^ Locale.extern thy loc ^ " =")
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        (map (Pretty.chunks o Element.pretty_ctxt ctxt) elems)]
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  end;
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(* consts *)
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fun consts loc depends decls lthy =
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  let
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    val xs = filter depends (#1 (ProofContext.inferred_fixes lthy));
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    val ys = filter (Variable.newly_fixed lthy (LocalTheory.target_of lthy) o #1) xs;
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    fun const ((c, T), mx) thy =
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      let
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        val U = map #2 xs ---> T;
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        val mx' = if null ys then mx else NoSyn;
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        val mx'' = Syntax.unlocalize_mixfix (loc <> "") mx';
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        val t = Term.list_comb (Const (Sign.full_name thy c, U), map Free xs);
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        val defn = ((c, if loc <> "" then mx else NoSyn (* FIXME !? *)), (("", []), t));
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        val abbr = ((c, mx'), fold_rev (lambda o Free) ys t);
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        val thy' = Sign.add_consts_authentic [(c, U, mx'')] thy;
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      in ((defn, abbr), thy') end;
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    val ((defns, abbrs), lthy') = lthy
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      |> LocalTheory.theory_result (fold_map const decls) |>> split_list;
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  in
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    lthy'
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    |> K (loc <> "") ? LocalTheory.abbrevs Syntax.default_mode abbrs
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    |> LocalDefs.add_defs defns |>> map (apsnd snd)
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  end;
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(* axioms *)
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local
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fun add_axiom hyps (name, prop) thy =
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  let
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    val name' = if name = "" then "axiom_" ^ serial_string () else name;
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    val prop' = Logic.list_implies (hyps, prop);
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    val thy' = thy |> Theory.add_axioms_i [(name', prop')];
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    val axm = Drule.unvarify (Thm.get_axiom_i thy' (Sign.full_name thy' name'));
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    val prems = map (Thm.assume o Thm.cterm_of thy') hyps;
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  in (Drule.implies_elim_list axm prems, thy') end;
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in
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fun axioms specs lthy =
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  let
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    val hyps = Assumption.assms_of lthy;
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    fun axiom ((name, atts), props) thy = thy
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      |> fold_map (add_axiom hyps) (PureThy.name_multi name props)
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      |-> (fn ths => pair ((name, atts), [(ths, [])]));
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  in
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    lthy
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    |> fold (fold Variable.declare_term o snd) specs
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    |> LocalTheory.theory_result (fold_map axiom specs)
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    |-> LocalTheory.notes
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  end;
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end;
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(* defs *)
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local
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fun add_def (name, prop) =
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  Theory.add_defs_i false false [(name, prop)] #>
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  (fn thy => (Drule.unvarify (Thm.get_axiom_i thy (Sign.full_name thy name)), thy));
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fun expand_defs lthy =
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  Drule.term_rule (ProofContext.theory_of lthy)
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    (Assumption.export false lthy (LocalTheory.target_of lthy));
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in
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fun defs args lthy =
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  let
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    fun def ((x, mx), ((name, atts), rhs)) lthy1 =
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      let
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        val name' = Thm.def_name_optional x name;
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        val T = Term.fastype_of rhs;
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        val rhs' = expand_defs lthy1 rhs;
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        val depends = member (op =) (Term.add_frees rhs' []);
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        val defined = filter_out depends (Term.add_frees rhs []);
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        val rhs_conv = rhs
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          |> Thm.cterm_of (ProofContext.theory_of lthy1)
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          |> Tactic.rewrite true (map_filter (LocalDefs.find_def lthy1 o #1) defined);
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        val ([(lhs, local_def)], lthy2) = lthy1
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          |> LocalTheory.consts depends [((x, T), mx)];
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        val lhs' = #2 (Logic.dest_equals (Thm.prop_of local_def));
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        val (global_def, lthy3) = lthy2
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          |> LocalTheory.theory_result (add_def (name', Logic.mk_equals (lhs', rhs')));
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        val eq = Thm.transitive (Thm.transitive local_def global_def) (Thm.symmetric rhs_conv);
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      in ((lhs, ((name', atts), [([eq], [])])), lthy3) end;
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    val ((lhss, facts), lthy') = lthy |> fold_map def args |>> split_list;
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    val (res, lthy'') = lthy' |> LocalTheory.notes facts;
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  in (lhss ~~ map (apsnd the_single) res, lthy'') end;
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end;
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(* notes *)
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fun context_notes facts lthy =
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  let
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    val facts' = facts
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      |> Element.export_standard_facts lthy lthy
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      |> Attrib.map_facts (Attrib.attribute_i (ProofContext.theory_of lthy));
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  in
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    lthy
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    |> ProofContext.qualified_names
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    |> ProofContext.note_thmss_i facts'
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    ||> ProofContext.restore_naming lthy
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  end;
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fun theory_notes keep_atts facts lthy = lthy |> LocalTheory.theory (fn thy =>
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  let
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    val facts' = facts
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      |> Element.export_standard_facts lthy (ProofContext.init thy)
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      |> Attrib.map_facts (if keep_atts then Attrib.attribute_i thy else K I);
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  in
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    thy
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    |> Sign.qualified_names
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    |> PureThy.note_thmss_i "" facts' |> #2
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    |> Sign.restore_naming thy
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  end);
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fun locale_notes loc facts lthy = lthy |> LocalTheory.target (fn ctxt =>
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  #2 (Locale.add_thmss "" loc (Element.export_standard_facts lthy ctxt facts) ctxt));
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fun notes "" facts = theory_notes true facts #> context_notes facts
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  | notes loc facts = theory_notes false facts #> locale_notes loc facts #> context_notes facts;
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(* declarations *)
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fun term_syntax "" f = LocalTheory.theory (Context.theory_map f)
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  | term_syntax loc f = LocalTheory.target (Locale.add_term_syntax loc (Context.proof_map f));
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fun declaration "" f = LocalTheory.theory (Context.theory_map f)
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  | declaration loc f = I;    (* FIXME *)
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(* init and exit *)
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fun begin loc =
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  LocalTheory.init (SOME (NameSpace.base loc))
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   {pretty = pretty loc,
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    consts = consts loc,
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    axioms = axioms,
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    defs = defs,
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    notes = notes loc,
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    term_syntax = term_syntax loc,
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    declaration = declaration loc,
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    exit = K I}
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  #> Data.put (SOME loc);
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fun init_i NONE thy = begin "" (ProofContext.init thy)
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  | init_i (SOME loc) thy = begin loc (Locale.init loc thy);
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fun init loc thy = init_i (Option.map (Locale.intern thy) loc) thy;
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fun mapping loc f = init loc #> f #> LocalTheory.exit false;
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end;