src/Pure/Isar/specification.ML
author wenzelm
Sat Oct 13 17:16:39 2007 +0200 (2007-10-13)
changeset 25016 2bcac52d7abc
parent 25011 633afd909ff2
child 25211 aec1cbdbca71
permissions -rw-r--r--
renamed LocalTheory.def to LocalTheory.define;
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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 print_consts: local_theory -> (string * typ -> bool) -> (string * typ) list -> unit
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  val check_specification: (string * typ option * mixfix) list ->
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    ((string * Attrib.src list) * term list) list list -> Proof.context ->
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    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
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    Proof.context
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  val read_specification: (string * string option * mixfix) list ->
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    ((string * Attrib.src list) * string list) list list -> Proof.context ->
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    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
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    Proof.context
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  val check_free_specification: (string * typ option * mixfix) list ->
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    ((string * Attrib.src list) * term list) list -> Proof.context ->
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    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
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    Proof.context
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  val read_free_specification: (string * string option * mixfix) list ->
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    ((string * Attrib.src list) * string list) list -> Proof.context ->
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    (((string * typ) * mixfix) list * ((string * Attrib.src list) * term list) list) *
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    Proof.context
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  val axiomatization: (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 axiomatization_cmd: (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 definition:
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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 definition_cmd:
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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 abbreviation: Syntax.mode -> (string * typ option * mixfix) option * term ->
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    local_theory -> local_theory
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  val abbreviation_cmd: Syntax.mode -> (string * string option * mixfix) option * string ->
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    local_theory -> local_theory
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  val notation: bool -> Syntax.mode -> (term * mixfix) list -> local_theory -> local_theory
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  val notation_cmd: bool -> Syntax.mode -> (string * mixfix) list -> local_theory -> local_theory
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  val theorems: 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 theorems_cmd: 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 theorem: string -> Method.text option ->
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    (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 theorem_cmd: string -> Method.text option ->
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    (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 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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fun print_consts _ _ [] = ()
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  | print_consts ctxt pred cs = Pretty.writeln (ProofDisplay.pretty_consts ctxt pred cs);
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(* prepare specification *)
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local
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fun close_forms ctxt i xs As =
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  let
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    fun add_free (Free (x, _)) = if Variable.is_fixed ctxt x then I else insert (op =) x
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      | add_free _ = I;
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    val commons = map #1 xs;
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    val _ =
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      (case duplicates (op =) commons of [] => ()
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      | dups => error ("Duplicate local variables " ^ commas_quote dups));
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    val frees = rev ((fold o fold_aterms) add_free As (rev commons));
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    val types = map (TypeInfer.param i o rpair []) (Name.invents Name.context Name.aT (length frees));
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    val uniform_typing = the o AList.lookup (op =) (frees ~~ types);
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    fun abs_body lev y (Abs (x, T, b)) = Abs (x, T, abs_body (lev + 1) y b)
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      | abs_body lev y (t $ u) = abs_body lev y t $ abs_body lev y u
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      | abs_body lev y (t as Free (x, T)) =
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          if x = y then TypeInfer.constrain (uniform_typing x) (TypeInfer.constrain T (Bound lev))
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          else t
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      | abs_body _ _ a = a;
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    fun close (y, U) B =
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      let val B' = abs_body 0 y (Term.incr_boundvars 1 B)
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      in if Term.loose_bvar1 (B', 0) then Term.all dummyT $ Abs (y, U, B') else B end;
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    fun close_form A =
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      let
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        val occ_frees = rev (fold_aterms add_free A []);
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        val bounds = xs @ map (rpair dummyT) (subtract (op =) commons occ_frees);
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      in fold_rev close bounds A end;
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  in map close_form As end;
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fun prep_spec prep_vars parse_prop prep_att do_close raw_vars raw_specss 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 Asss = (map o map) (map (parse_prop params_ctxt) o snd) raw_specss;
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    val names = Variable.names_of (params_ctxt |> (fold o fold o fold) Variable.declare_term Asss)
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      |> fold Name.declare xs;
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    val Asss' = #1 ((fold_map o fold_map o fold_map) Term.free_dummy_patterns Asss names);
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    val idx = (fold o fold o fold) Term.maxidx_term Asss' ~1 + 1;
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    val specs =
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      (if do_close then
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        #1 (fold_map
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            (fn Ass => fn i => (burrow (close_forms params_ctxt i []) Ass, i + 1)) Asss' idx)
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      else Asss')
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      |> flat |> burrow (Syntax.check_props params_ctxt);
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    val specs_ctxt = params_ctxt |> (fold o fold) Variable.declare_term specs;
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    val vs = specs_ctxt |> fold_map ProofContext.inferred_param xs |> fst;
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    val params = vs ~~ map #3 vars;
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    val name_atts = map (fn ((name, atts), _) => (name, map (prep_att thy) atts)) (flat raw_specss);
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  in ((params, name_atts ~~ specs), specs_ctxt) end;
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fun read_spec x = prep_spec ProofContext.read_vars Syntax.parse_prop Attrib.intern_src x;
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fun check_spec x = prep_spec ProofContext.cert_vars (K I) (K I) x;
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in
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fun read_specification x = read_spec true x;
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fun check_specification x = check_spec true x;
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fun read_free_specification vars specs = read_spec false vars [specs];
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fun check_free_specification vars specs = check_spec false vars [specs];
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end;
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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), _) = prep raw_vars [raw_specs] lthy;
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    val ((consts, axioms), lthy') = LocalTheory.axioms Thm.axiomK (vars, specs) lthy;
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    val consts' = map (Morphism.term (LocalTheory.target_morphism lthy')) consts;
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    val _ = print_consts lthy' (member (op =) (fold Term.add_frees consts' [])) (map fst vars);
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  in ((consts, axioms), lthy') end;
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val axiomatization = gen_axioms check_specification;
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val axiomatization_cmd = gen_axioms read_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.define 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_default_func_attr :: 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 check_free_specification;
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val definition_cmd = gen_def read_free_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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        (lthy |> ProofContext.set_mode ProofContext.mode_abbrev);
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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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      |> 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 check_free_specification;
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val abbreviation_cmd = gen_abbrev read_free_specification;
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(* notation *)
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fun gen_notation prep_const add mode args lthy =
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  lthy |> LocalTheory.notation add mode (map (apfst (prep_const lthy)) args);
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val notation = gen_notation (K I);
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val notation_cmd = gen_notation ProofContext.read_const;
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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 _ = ProofDisplay.present_results lthy' ((kind, ""), res);
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  in (res, lthy') end;
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val theorems = gen_theorems (K I) (K I);
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val theorems_cmd = gen_theorems ProofContext.get_thms Attrib.intern_src;
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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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        ({target, is_locale = true, ...}, true) =>
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          (*temporary workaround for non-modularity of in/includes*)  (* FIXME *)
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          (SOME target, 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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          (ProofDisplay.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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    |> Proof.refine_insert facts
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    |> Library.apply (map (fn (f, _) => f int) (rev (TheoremHook.get (Context.Proof goal_ctxt))))
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   333
  end;
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wenzelm@21230
   335
in
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   336
wenzelm@24927
   337
val theorem = gen_theorem (K I) Locale.cert_context_statement;
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val theorem_cmd = gen_theorem Attrib.intern_src Locale.read_context_statement_i;
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berghofe@24452
   340
fun add_theorem_hook f = TheoremHook.map (cons (f, stamp ()));
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   341
wenzelm@18620
   342
end;
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   343
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   344
end;