src/Pure/Isar/attrib.ML
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(*  Title:      Pure/Isar/attrib.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Symbolic representation of attributes -- with name and syntax.
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*)
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signature BASIC_ATTRIB =
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sig
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  val print_attributes: theory -> unit
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  val Attribute: bstring -> (Args.src -> attribute) -> string -> unit
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end;
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signature ATTRIB =
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sig
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  include BASIC_ATTRIB
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  type src
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  exception ATTRIB_FAIL of (string * Position.T) * exn
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  val intern: theory -> xstring -> string
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  val intern_src: theory -> src -> src
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  val pretty_attribs: Proof.context -> src list -> Pretty.T list
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  val attribute: theory -> src -> attribute
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  val attribute_i: theory -> src -> attribute
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  val map_specs: ('a -> 'att) ->
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    (('c * 'a list) * 'd) list -> (('c * 'att list) * 'd) list
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  val map_facts: ('a -> 'att) ->
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    (('c * 'a list) * ('d * 'a list) list) list ->
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    (('c * 'att list) * ('d * 'att list) list) list
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  val crude_closure: Proof.context -> src -> src
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  val add_attributes: (bstring * (src -> attribute) * string) list -> theory -> theory
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  val thm: Context.generic * Args.T list -> thm * (Context.generic * Args.T list)
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  val thms: Context.generic * Args.T list -> thm list * (Context.generic * Args.T list)
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  val multi_thm: Context.generic * Args.T list -> thm list * (Context.generic * Args.T list)
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  val syntax: (Context.generic * Args.T list ->
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    attribute * (Context.generic * Args.T list)) -> src -> attribute
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  val no_args: attribute -> src -> attribute
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  val add_del_args: attribute -> attribute -> src -> attribute
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  val internal: attribute -> src
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end;
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structure Attrib: ATTRIB =
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struct
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type src = Args.src;
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(** named attributes **)
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(* theory data *)
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structure AttributesData = TheoryDataFun
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(struct
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  val name = "Isar/attributes";
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  type T = (((src -> attribute) * string) * stamp) NameSpace.table;
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  val empty = NameSpace.empty_table;
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  val copy = I;
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  val extend = I;
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  fun merge _ tables = NameSpace.merge_tables (eq_snd (op =)) tables handle Symtab.DUPS dups =>
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    error ("Attempt to merge different versions of attribute(s) " ^ commas_quote dups);
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  fun print _ attribs =
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    let
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      fun prt_attr (name, ((_, comment), _)) = Pretty.block
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        [Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];
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    in
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      [Pretty.big_list "attributes:" (map prt_attr (NameSpace.extern_table attribs))]
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      |> Pretty.chunks |> Pretty.writeln
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    end;
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end);
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val _ = Context.add_setup AttributesData.init;
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val print_attributes = AttributesData.print;
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(* name space *)
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val intern = NameSpace.intern o #1 o AttributesData.get;
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val intern_src = Args.map_name o intern;
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val extern = NameSpace.extern o #1 o AttributesData.get o ProofContext.theory_of;
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(* pretty printing *)
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fun pretty_attribs _ [] = []
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  | pretty_attribs ctxt srcs =
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      [Pretty.enclose "[" "]"
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        (Pretty.commas (map (Args.pretty_src ctxt o Args.map_name (extern ctxt)) srcs))];
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(* get attributes *)
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exception ATTRIB_FAIL of (string * Position.T) * exn;
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fun attribute_i thy =
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  let
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    val attrs = #2 (AttributesData.get thy);
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    fun attr src =
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      let val ((name, _), pos) = Args.dest_src src in
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        (case Symtab.lookup attrs name of
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          NONE => error ("Unknown attribute: " ^ quote name ^ Position.str_of pos)
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        | SOME ((att, _), _) => transform_failure (curry ATTRIB_FAIL (name, pos)) (att src))
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      end;
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  in attr end;
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fun attribute thy = attribute_i thy o intern_src thy;
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(* attributed declarations *)
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fun map_specs f = map (apfst (apsnd (map f)));
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fun map_facts f = map (apfst (apsnd (map f)) o apsnd (map (apsnd (map f))));
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(* crude_closure *)
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(*Produce closure without knowing facts in advance! The following
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  works reasonably well for attribute parsers that do not peek at the
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  thm structure.*)
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fun crude_closure ctxt src =
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 (try (fn () => attribute_i (ProofContext.theory_of ctxt) src
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    (Context.Proof ctxt, Drule.asm_rl)) ();
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  Args.closure src);
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(* add_attributes *)
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fun add_attributes raw_attrs thy =
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  let
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    val new_attrs =
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      raw_attrs |> map (fn (name, att, comment) => (name, ((att, comment), stamp ())));
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    fun add attrs = NameSpace.extend_table (Sign.naming_of thy) (attrs, new_attrs)
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      handle Symtab.DUPS dups =>
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        error ("Duplicate declaration of attributes(s) " ^ commas_quote dups);
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  in AttributesData.map add thy end;
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fun Attribute name att cmt = Context.>> (add_attributes [(name, att, cmt)]);
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(** attribute parsers **)
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(* tags *)
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fun tag x = Scan.lift (Args.name -- Scan.repeat Args.name) x;
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(* theorems *)
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local
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val get_thms = Context.cases PureThy.get_thms ProofContext.get_thms;
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fun gen_thm pick = Scan.depend (fn st =>
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 (Args.internal_fact
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    >> (fn fact => ("<fact>", Name "", fact)) ||
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  Scan.ahead Args.alt_name -- Args.named_fact (get_thms st o Fact)
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    >> (fn (s, fact) => ("", Fact s, fact)) ||
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  Scan.ahead Args.name -- Args.named_fact (get_thms st o Name) -- Args.thm_sel
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    >> (fn ((name, fact), sel) => (name, NameSelection (name, sel), fact)) ||
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  Scan.ahead Args.name -- Args.named_fact (get_thms st o Name)
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    >> (fn (name, fact) => (name, Name name, fact))) --
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  Args.opt_attribs (intern (Context.theory_of st))
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  >> (fn ((name, thmref, fact), srcs) =>
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    let
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      val ths = PureThy.select_thm thmref fact;
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      val atts = map (attribute_i (Context.theory_of st)) srcs;
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      val (st', ths') = foldl_map (Library.apply atts) (st, ths);
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    in (st', pick name ths') end));
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in
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val thm = gen_thm PureThy.single_thm;
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val multi_thm = gen_thm (K I);
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val thms = Scan.repeat multi_thm >> flat;
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end;
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(** attribute syntax **)
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fun syntax scan src (st, th) =
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  let val (st', f) = Args.syntax "attribute" scan src st
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  in f (st', th) end;
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fun no_args x = syntax (Scan.succeed x);
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fun add_del_args add del x = syntax
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  (Scan.lift (Args.add >> K add || Args.del >> K del || Scan.succeed add)) x;
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(** basic attributes **)
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(* tags *)
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fun tagged x = syntax (tag >> PureThy.tag) x;
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fun untagged x = syntax (Scan.lift Args.name >> PureThy.untag) x;
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fun kind x = syntax (Scan.lift Args.name >> PureThy.kind) x;
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(* rule composition *)
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val COMP_att =
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  syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm
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    >> (fn (i, B) => Thm.rule_attribute (fn _ => fn A => Drule.compose_single (A, i, B))));
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val THEN_att =
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  syntax (Scan.lift (Scan.optional (Args.bracks Args.nat) 1) -- thm
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    >> (fn (i, B) => Thm.rule_attribute (fn _ => fn A => A RSN (i, B))));
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val OF_att =
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  syntax (thms >> (fn Bs => Thm.rule_attribute (fn _ => fn A => Bs MRS A)));
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(* rename_abs *)
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fun rename_abs src = syntax
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  (Scan.lift (Scan.repeat (Args.maybe Args.name) >> (apsnd o Drule.rename_bvars'))) src;
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(* unfold / fold definitions *)
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fun unfolded_syntax rule =
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  syntax (thms >>
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    (fn ths => Thm.rule_attribute (fn context => rule (Context.proof_of context) ths)));
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val unfolded = unfolded_syntax LocalDefs.unfold;
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val folded = unfolded_syntax LocalDefs.fold;
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(* rule cases *)
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fun consumes x = syntax (Scan.lift (Scan.optional Args.nat 1) >> RuleCases.consumes) x;
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fun case_names x = syntax (Scan.lift (Scan.repeat1 Args.name) >> RuleCases.case_names) x;
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fun case_conclusion x =
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  syntax (Scan.lift (Args.name -- Scan.repeat Args.name) >> RuleCases.case_conclusion) x;
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fun params x = syntax (Args.and_list1 (Scan.lift (Scan.repeat Args.name)) >> RuleCases.params) x;
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(* rule format *)
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fun rule_format_att x = syntax (Args.mode "no_asm"
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  >> (fn true => ObjectLogic.rule_format_no_asm | false => ObjectLogic.rule_format)) x;
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fun elim_format x = no_args (Thm.rule_attribute (K Tactic.make_elim)) x;
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(* misc rules *)
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fun standard x = no_args (Thm.rule_attribute (K Drule.standard)) x;
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fun no_vars x = no_args (Thm.rule_attribute (fn ctxt => fn th =>
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  let val ((_, [th']), _) = Variable.import true [th] (Context.proof_of ctxt)
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  in th' end)) x;
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fun eta_long x = no_args (Thm.rule_attribute (K (Drule.fconv_rule Drule.eta_long_conversion))) x;
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(* internal attribute *)
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fun internal att = Args.src (("Pure.attribute", [Args.mk_attribute att]), Position.none);
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fun internal_att x = syntax (Scan.lift Args.internal_attribute) x;
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(* theory setup *)
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val _ = Context.add_setup
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 (add_attributes
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   [("tagged", tagged, "tagged theorem"),
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    ("untagged", untagged, "untagged theorem"),
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    ("kind", kind, "theorem kind"),
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    ("COMP", COMP_att, "direct composition with rules (no lifting)"),
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    ("THEN", THEN_att, "resolution with rule"),
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    ("OF", OF_att, "rule applied to facts"),
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    ("rename_abs", rename_abs, "rename bound variables in abstractions"),
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    ("unfolded", unfolded, "unfolded definitions"),
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    ("folded", folded, "folded definitions"),
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    ("standard", standard, "result put into standard form"),
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    ("elim_format", elim_format, "destruct rule turned into elimination rule format"),
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    ("no_vars", no_vars, "frozen schematic vars"),
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    ("eta_long", eta_long, "put theorem into eta long beta normal form"),
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    ("consumes", consumes, "number of consumed facts"),
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    ("case_names", case_names, "named rule cases"),
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    ("case_conclusion", case_conclusion, "named conclusion of rule cases"),
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    ("params", params, "named rule parameters"),
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    ("atomize", no_args ObjectLogic.declare_atomize, "declaration of atomize rule"),
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    ("rulify", no_args ObjectLogic.declare_rulify, "declaration of rulify rule"),
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    ("rule_format", rule_format_att, "result put into standard rule format"),
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    ("defn", add_del_args LocalDefs.defn_add LocalDefs.defn_del,
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      "declaration of definitional transformations"),
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    ("attribute", internal_att, "internal attribute")]);
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end;
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structure BasicAttrib: BASIC_ATTRIB = Attrib;
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open BasicAttrib;