src/Pure/Isar/specification.ML
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(*  Title:      Pure/Isar/specification.ML
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    ID:         $Id$
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    Author:     Makarius
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Derived local theory specifications --- with type-inference and
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toplevel polymorphism.
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*)
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signature SPECIFICATION =
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sig
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  val quiet_mode: bool ref
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  val print_consts: local_theory -> (string * typ -> bool) -> (string * typ) list -> unit
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  val read_specification: (string * string option * mixfix) list ->
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    ((string * Attrib.src list) * string list) list -> local_theory ->
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    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
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    local_theory
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  val cert_specification: (string * typ option * mixfix) list ->
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    ((string * Attrib.src list) * term list) list -> local_theory ->
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    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
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    local_theory
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  val axiomatization: (string * string option * mixfix) list ->
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    ((bstring * Attrib.src list) * string list) list -> local_theory ->
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    (term list * (bstring * thm list) list) * local_theory
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  val axiomatization_i: (string * typ option * mixfix) list ->
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    ((bstring * Attrib.src list) * term list) list -> local_theory ->
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    (term list * (bstring * thm list) list) * local_theory
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  val definition:
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    (string * string option * mixfix) option * ((string * Attrib.src list) * string) ->
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    local_theory -> (term * (bstring * thm)) * local_theory
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  val definition_i:
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    (string * typ option * mixfix) option * ((string * Attrib.src list) * term) ->
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    local_theory -> (term * (bstring * thm)) * local_theory
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  val abbreviation: Syntax.mode -> (string * string option * mixfix) option * string ->
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    local_theory -> local_theory
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  val abbreviation_i: Syntax.mode -> (string * typ option * mixfix) option * term ->
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    local_theory -> local_theory
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  val notation: Syntax.mode -> (string * mixfix) list -> local_theory -> local_theory
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  val notation_i: Syntax.mode -> (term * mixfix) list -> local_theory -> local_theory
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  val theorems: string -> ((bstring * Attrib.src list) * (thmref * Attrib.src list) list) list
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    -> local_theory -> (bstring * thm list) list * local_theory
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  val theorems_i: string -> ((bstring * Attrib.src list) * (thm list * Attrib.src list) list) list
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    -> local_theory -> (bstring * thm list) list * local_theory
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  val theorem: string -> Method.text option -> (thm list list -> local_theory -> local_theory) ->
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    string * Attrib.src list -> Element.context Locale.element list -> Element.statement ->
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    bool -> local_theory -> Proof.state
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  val theorem_i: string -> Method.text option -> (thm list list -> local_theory -> local_theory) ->
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    string * Attrib.src list -> Element.context_i Locale.element list -> Element.statement_i ->
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    bool -> local_theory -> Proof.state
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  val add_theorem_hook: (bool -> Proof.state -> Proof.state) -> Context.generic -> Context.generic
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end;
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structure Specification: SPECIFICATION =
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struct
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(* diagnostics *)
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val quiet_mode = ref false;
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fun print_consts _ _ [] = ()
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  | print_consts ctxt pred cs =
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      if ! quiet_mode then () else Pretty.writeln (ProofDisplay.pretty_consts ctxt pred cs);
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fun present_results ctxt res =
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  if ! quiet_mode then () else ProofDisplay.present_results ctxt res;
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fun present_results' ctxt kind res = present_results ctxt ((kind, ""), res);
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(* prepare specification *)
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fun prep_specification prep_vars prep_propp prep_att raw_vars raw_specs ctxt =
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  let
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    val thy = ProofContext.theory_of ctxt;
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    val (vars, vars_ctxt) = ctxt |> prep_vars raw_vars;
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    val (xs, params_ctxt) = vars_ctxt |> ProofContext.add_fixes_i vars;
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    val ((specs, vs), specs_ctxt) =
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      prep_propp (params_ctxt, map (map (rpair []) o snd) raw_specs)
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      |> swap |>> map (map fst)
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      ||>> fold_map ProofContext.inferred_param xs;
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    val params = vs ~~ map #3 vars;
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    val names = map (fst o fst) raw_specs;
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    val atts = map (map (prep_att thy) o snd o fst) raw_specs;
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  in ((params, (names ~~ atts) ~~ specs), specs_ctxt) end;
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fun read_specification x =
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  prep_specification ProofContext.read_vars ProofContext.read_propp Attrib.intern_src x;
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fun cert_specification x =
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  prep_specification ProofContext.cert_vars ProofContext.cert_propp (K I) x;
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(* axiomatization *)
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fun gen_axioms prep raw_vars raw_specs lthy =
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  let
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    val (vars, specs) = fst (prep raw_vars raw_specs lthy);
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    val cs = map fst vars;
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    val spec_frees = member (op =) (fold (fold Term.add_frees o snd) specs []);
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    val ((consts, axioms), lthy') = lthy
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      |> LocalTheory.consts spec_frees vars
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      ||> fold (fold Variable.auto_fixes o snd) specs   (* FIXME !? *)
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      ||>> LocalTheory.axioms Thm.axiomK specs;
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    (* FIXME generic target!? *)
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    val hs = map (Term.head_of o #2 o Logic.dest_equals o Thm.prop_of o #2) consts;
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    val lthy'' = lthy' |> LocalTheory.theory (Theory.add_finals_i false hs);
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    val _ = print_consts lthy' spec_frees cs;
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  in ((map #1 consts, axioms), lthy'') end;
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val axiomatization = gen_axioms read_specification;
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val axiomatization_i = gen_axioms cert_specification;
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(* definition *)
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fun gen_def prep (raw_var, (raw_a, raw_prop)) lthy =
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  let
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    val (vars, [((raw_name, atts), [prop])]) =
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      fst (prep (the_list raw_var) [(raw_a, [raw_prop])] lthy);
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    val (((x, T), rhs), prove) = LocalDefs.derived_def lthy true prop;
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    val name = Thm.def_name_optional x raw_name;
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    val mx = (case vars of [] => NoSyn | [((x', _), mx)] =>
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      if x = x' then mx
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      else error ("Head of definition " ^ quote x ^ " differs from declaration " ^ quote x'));
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    val ((lhs, (_, th)), lthy2) = lthy
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      |> LocalTheory.def Thm.definitionK ((x, mx), ((name ^ "_raw", []), rhs));
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    val ((b, [th']), lthy3) = lthy2
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      |> LocalTheory.note Thm.definitionK
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          ((name, Code.add_func_attr false :: atts), [prove lthy2 th]);
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    val lhs' = Morphism.term (LocalTheory.target_morphism lthy3) lhs;
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    val _ = print_consts lthy3 (member (op =) (Term.add_frees lhs' [])) [(x, T)];
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  in ((lhs, (b, th')), lthy3) end;
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val definition = gen_def read_specification;
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val definition_i = gen_def cert_specification;
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(* abbreviation *)
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fun gen_abbrev prep mode (raw_var, raw_prop) lthy =
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  let
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    val ((vars, [(_, [prop])]), _) =
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      prep (the_list raw_var) [(("", []), [raw_prop])]
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7b3ccdae9212 TermSyntax.abbrev;
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        (lthy |> ProofContext.set_expand_abbrevs false);
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    val ((x, T), rhs) = LocalDefs.abs_def (#2 (LocalDefs.cert_def lthy prop));
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    val mx = (case vars of [] => NoSyn | [((y, _), mx)] =>
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      if x = y then mx
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      else error ("Head of abbreviation " ^ quote x ^ " differs from declaration " ^ quote y));
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    val lthy' = lthy
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      |> ProofContext.set_syntax_mode mode    (* FIXME !? *)
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74409847e349 LocalTheory.abbrev;
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      |> LocalTheory.abbrev mode ((x, mx), rhs) |> snd
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      |> ProofContext.restore_syntax_mode lthy;
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    val _ = print_consts lthy' (K false) [(x, T)]
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  in lthy' end;
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val abbreviation = gen_abbrev read_specification;
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val abbreviation_i = gen_abbrev cert_specification;
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(* notation *)
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fun gen_notation prep_const mode args lthy =
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  lthy |> LocalTheory.notation mode (map (apfst (prep_const lthy)) args);
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val notation = gen_notation ProofContext.read_const;
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val notation_i = gen_notation (K I);
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(* fact statements *)
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fun gen_theorems prep_thms prep_att kind raw_facts lthy =
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  let
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    val attrib = prep_att (ProofContext.theory_of lthy);
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    val facts = raw_facts |> map (fn ((name, atts), bs) =>
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      ((name, map attrib atts),
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        bs |> map (fn (b, more_atts) => (prep_thms lthy b, map attrib more_atts))));
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    val (res, lthy') = lthy |> LocalTheory.notes kind facts;
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    val _ = present_results' lthy' kind res;
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  in (res, lthy') end;
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val theorems = gen_theorems ProofContext.get_thms Attrib.intern_src;
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val theorems_i = gen_theorems (K I) (K I);
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(* complex goal statements *)
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local
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fun subtract_prems ctxt1 ctxt2 =
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  Library.drop (length (Assumption.prems_of ctxt1), Assumption.prems_of ctxt2);
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fun prep_statement prep_att prep_stmt elems concl ctxt =
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  (case concl of
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    Element.Shows shows =>
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      let
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        val (_, loc_ctxt, elems_ctxt, propp) = prep_stmt elems (map snd shows) ctxt;
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        val prems = subtract_prems loc_ctxt elems_ctxt;
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        val stmt = Attrib.map_specs prep_att (map fst shows ~~ propp);
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        val goal_ctxt = fold (fold (Variable.auto_fixes o fst)) propp elems_ctxt;
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      in ((prems, stmt, []), goal_ctxt) end
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  | Element.Obtains obtains =>
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      let
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        val case_names = obtains |> map_index
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          (fn (i, ("", _)) => string_of_int (i + 1) | (_, (name, _)) => name);
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        val constraints = obtains |> map (fn (_, (vars, _)) =>
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          Locale.Elem (Element.Constrains
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            (vars |> map_filter (fn (x, SOME T) => SOME (x, T) | _ => NONE))));
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        val raw_propp = obtains |> map (fn (_, (_, props)) => map (rpair []) props);
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        val (_, loc_ctxt, elems_ctxt, propp) = prep_stmt (elems @ constraints) raw_propp ctxt;
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        val thesis = ObjectLogic.fixed_judgment (ProofContext.theory_of ctxt) AutoBind.thesisN;
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        fun assume_case ((name, (vars, _)), asms) ctxt' =
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          let
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            val xs = map fst vars;
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            val props = map fst asms;
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            val (parms, _) = ctxt'
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              |> fold Variable.declare_term props
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              |> fold_map ProofContext.inferred_param xs;
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            val asm = Term.list_all_free (parms, Logic.list_implies (props, thesis));
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          in
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            ctxt' |> (snd o ProofContext.add_fixes_i (map (fn x => (x, NONE, NoSyn)) xs));
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            ctxt' |> Variable.auto_fixes asm
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            |> ProofContext.add_assms_i Assumption.assume_export
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              [((name, [ContextRules.intro_query NONE]), [(asm, [])])]
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            |>> (fn [(_, [th])] => th)
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          end;
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        val atts = map (Attrib.internal o K)
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          [RuleCases.consumes (~ (length obtains)), RuleCases.case_names case_names];
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        val prems = subtract_prems loc_ctxt elems_ctxt;
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        val stmt = [(("", atts), [(thesis, [])])];
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        val (facts, goal_ctxt) = elems_ctxt
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          |> (snd o ProofContext.add_fixes_i [(AutoBind.thesisN, NONE, NoSyn)])
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          |> fold_map assume_case (obtains ~~ propp)
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          |-> (fn ths => ProofContext.note_thmss_i Thm.assumptionK
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                [((Obtain.thatN, []), [(ths, [])])] #> #2 #> pair ths);
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      in ((prems, stmt, facts), goal_ctxt) end);
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structure TheoremHook = GenericDataFun
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(
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  type T = ((bool -> Proof.state -> Proof.state) * stamp) list;
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  val empty = [];
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  val extend = I;
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  fun merge _ hooks : T = Library.merge (eq_snd op =) hooks;
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);
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fun gen_theorem prep_att prep_stmt
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    kind before_qed after_qed (name, raw_atts) raw_elems raw_concl int lthy0 =
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  let
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    val _ = LocalTheory.affirm lthy0;
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    val thy = ProofContext.theory_of lthy0;
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    val (loc, ctxt, lthy) =
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      (case (TheoryTarget.peek lthy0, exists (fn Locale.Expr _ => true | _ => false) raw_elems) of
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        (SOME loc, true) => (* workaround non-modularity of in/includes *)  (* FIXME *)
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          (SOME loc, ProofContext.init thy, LocalTheory.restore lthy0)
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      | _ => (NONE, lthy0, lthy0));
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    val attrib = prep_att thy;
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    val atts = map attrib raw_atts;
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    val elems = raw_elems |> map (Locale.map_elem (Element.map_ctxt_attrib attrib));
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    val ((prems, stmt, facts), goal_ctxt) =
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      prep_statement attrib (prep_stmt loc) elems raw_concl ctxt;
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    fun after_qed' results goal_ctxt' =
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      let val results' =
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        burrow (map Goal.norm_result o ProofContext.export goal_ctxt' lthy) results
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      in
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        lthy
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        |> LocalTheory.notes kind (map2 (fn (a, _) => fn ths => (a, [(ths, [])])) stmt results')
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        |> (fn (res, lthy') =>
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          (present_results lthy' ((kind, name), res);
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            if name = "" andalso null atts then lthy'
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            else #2 (LocalTheory.notes kind [((name, atts), [(maps #2 res, [])])] lthy')))
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        |> after_qed results'
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      end;
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  in
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    goal_ctxt
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    |> ProofContext.note_thmss_i Thm.assumptionK [((AutoBind.assmsN, []), [(prems, [])])]
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    |> snd
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    |> Proof.theorem_i before_qed after_qed' (map snd stmt)
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    |> Library.apply (map (fn (f, _) => f int)
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      (TheoremHook.get (Context.Proof goal_ctxt)))
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    |> Proof.refine_insert facts
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  end;
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in
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val theorem = gen_theorem Attrib.intern_src Locale.read_context_statement_i;
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val theorem_i = gen_theorem (K I) Locale.cert_context_statement;
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fun add_theorem_hook f = TheoremHook.map (cons (f, stamp ()));
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end;
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end;