src/Pure/Isar/attrib.ML
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(*  Title:      Pure/Isar/attrib.ML
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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 ATTRIB =
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sig
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  type src = Args.src
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  type binding = binding * src list
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  val empty_binding: binding
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  val print_attributes: theory -> unit
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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 defined: theory -> string -> bool
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  val attribute: theory -> src -> attribute
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  val attribute_i: theory -> src -> attribute
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  val eval_thms: Proof.context -> (Facts.ref * src list) list -> thm list
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  val map_specs: ('a -> 'att) ->
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    (('c * 'a list) * 'b) list -> (('c * 'att list) * 'b) 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 map_facts_refs: ('a -> 'att) -> ('b -> 'fact) ->
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    (('c * 'a list) * ('b * 'a list) list) list ->
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    (('c * 'att list) * ('fact * 'att list) list) list
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  val crude_closure: Proof.context -> src -> src
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  val setup: Binding.binding -> attribute context_parser -> string -> theory -> theory
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  val attribute_setup: bstring * Position.T -> Symbol_Pos.text * Position.T -> string ->
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    theory -> theory
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  val add_del: attribute -> attribute -> attribute context_parser
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  val thm_sel: Facts.interval list parser
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  val thm: thm context_parser
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  val thms: thm list context_parser
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  val multi_thm: thm list context_parser
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  val print_configs: Proof.context -> unit
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  val internal: (morphism -> attribute) -> src
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  val register_config: Config.value Config.T -> theory -> theory
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  val config_bool: bstring -> bool -> bool Config.T * (theory -> theory)
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  val config_int: bstring -> int -> int Config.T * (theory -> theory)
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  val config_string: bstring -> string -> string Config.T * (theory -> theory)
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  val config_bool_global: bstring -> bool -> bool Config.T * (theory -> theory)
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  val config_int_global: bstring -> int -> int Config.T * (theory -> theory)
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  val config_string_global: bstring -> string -> string Config.T * (theory -> theory)
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end;
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structure Attrib: ATTRIB =
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struct
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structure T = OuterLex;
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structure P = OuterParse;
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a05ca48ef263 type Attrib.binding abbreviates Name.binding without attributes;
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(* source and bindings *)
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type src = Args.src;
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type binding = binding * src list;
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val empty_binding: binding = (Binding.empty, []);
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a05ca48ef263 type Attrib.binding abbreviates Name.binding without attributes;
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(** named attributes **)
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(* theory data *)
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structure Attributes = Theory_Data
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(
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  type T = ((src -> attribute) * string) Name_Space.table;
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  val empty : T = Name_Space.empty_table "attribute";
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  val extend = I;
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  fun merge data : T = Name_Space.merge_tables data;
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);
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fun print_attributes thy =
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  let
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    val attribs = Attributes.get thy;
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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 (Name_Space.extern_table attribs))]
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    |> Pretty.chunks |> Pretty.writeln
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  end;
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fun add_attribute name att comment thy = thy
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  |> Attributes.map (#2 o Name_Space.define true (Sign.naming_of thy) (name, (att, comment)));
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(* name space *)
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val intern = Name_Space.intern o #1 o Attributes.get;
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val intern_src = Args.map_name o intern;
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val extern = Name_Space.extern o #1 o Attributes.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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val defined = Symtab.defined o #2 o Attributes.get;
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fun attribute_i thy =
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  let
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    val attrs = #2 (Attributes.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, _) => (Position.report (Markup.attribute 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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fun eval_thms ctxt args = ProofContext.note_thmss ""
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    [(Thm.empty_binding, args |> map (fn (a, atts) =>
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        (ProofContext.get_fact ctxt a, map (attribute (ProofContext.theory_of ctxt)) atts)))] ctxt
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  |> fst |> maps snd;
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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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fun map_facts_refs f g = map_facts f #> map (apsnd (map (apfst g)));
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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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(* attribute setup *)
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fun syntax scan = Args.syntax "attribute" scan;
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fun setup name scan =
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  add_attribute name
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    (fn src => fn (ctxt, th) => let val (a, ctxt') = syntax scan src ctxt in a (ctxt', th) end);
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fun attribute_setup name (txt, pos) cmt =
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  Context.theory_map (ML_Context.expression pos
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    "val (name, scan, comment): binding * attribute context_parser * string"
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    "Context.map_theory (Attrib.setup name scan comment)"
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    ("(" ^ ML_Syntax.make_binding name ^ ", " ^ txt ^ ", " ^ ML_Syntax.print_string cmt ^ ")"));
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(* add/del syntax *)
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fun add_del add del = Scan.lift (Args.add >> K add || Args.del >> K del || Scan.succeed add);
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(** parsing attributed theorems **)
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val thm_sel = P.$$$ "(" |-- P.list1
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 (P.nat --| P.minus -- P.nat >> Facts.FromTo ||
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  P.nat --| P.minus >> Facts.From ||
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  P.nat >> Facts.Single) --| P.$$$ ")";
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local
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val fact_name = Args.internal_fact >> K "<fact>" || Args.name;
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fun gen_thm pick = Scan.depend (fn context =>
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  let
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    val thy = Context.theory_of context;
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    val get = Context.cases (PureThy.get_fact context) ProofContext.get_fact context;
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    val get_fact = get o Facts.Fact;
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    fun get_named pos name = get (Facts.Named ((name, pos), NONE));
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  in
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    P.$$$ "[" |-- Args.attribs (intern thy) --| P.$$$ "]" >> (fn srcs =>
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      let
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        val atts = map (attribute_i thy) srcs;
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        val (context', th') = Library.apply atts (context, Drule.dummy_thm);
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      in (context', pick "" [th']) end)
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    ||
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    (Scan.ahead Args.alt_name -- Args.named_fact get_fact
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      >> (fn (s, fact) => ("", Facts.Fact s, fact)) ||
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     Scan.ahead (P.position fact_name) :|-- (fn (name, pos) =>
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      Args.named_fact (get_named pos) -- Scan.option thm_sel
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        >> (fn (fact, sel) => (name, Facts.Named ((name, pos), sel), fact))))
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    -- Args.opt_attribs (intern thy) >> (fn ((name, thmref, fact), srcs) =>
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      let
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        val ths = Facts.select thmref fact;
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        val atts = map (attribute_i thy) srcs;
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        val (context', ths') = Library.foldl_map (Library.apply atts) (context, ths);
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      in (context', pick name ths') end)
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  end);
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in
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val thm = gen_thm Facts.the_single;
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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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(** basic attributes **)
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(* internal *)
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fun internal att = Args.src (("Pure.attribute", [T.mk_attribute att]), Position.none);
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(* rule composition *)
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val COMP_att =
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  Scan.lift (Scan.optional (Args.bracks P.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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  Scan.lift (Scan.optional (Args.bracks P.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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  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 x = (Scan.repeat (Args.maybe Args.name) >> (apsnd o Drule.rename_bvars')) x;
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(* unfold / fold definitions *)
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fun unfolded_syntax rule =
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  thms >> (fn ths => Thm.rule_attribute (fn context => rule (Context.proof_of context) ths));
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val unfolded = unfolded_syntax Local_Defs.unfold;
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val folded = unfolded_syntax Local_Defs.fold;
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(* rule format *)
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val rule_format = Args.mode "no_asm"
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  >> (fn true => ObjectLogic.rule_format_no_asm | false => ObjectLogic.rule_format);
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val elim_format = Thm.rule_attribute (K Tactic.make_elim);
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(* misc rules *)
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val no_vars = Thm.rule_attribute (fn context => fn th =>
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  let
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    val ctxt = Variable.set_body false (Context.proof_of context);
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    val ((_, [th']), _) = Variable.import true [th] ctxt;
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  in th' end);
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val eta_long =
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  Thm.rule_attribute (K (Conv.fconv_rule Drule.eta_long_conversion));
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val rotated = Scan.optional P.int 1 >> (fn n => Thm.rule_attribute (K (rotate_prems n)));
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(* theory setup *)
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val _ = Context.>> (Context.map_theory
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 (setup (Binding.name "attribute") (Scan.lift Args.internal_attribute >> Morphism.form)
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    "internal attribute" #>
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  setup (Binding.name "tagged") (Scan.lift (Args.name -- Args.name) >> Thm.tag) "tagged theorem" #>
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  setup (Binding.name "untagged") (Scan.lift Args.name >> Thm.untag) "untagged theorem" #>
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  setup (Binding.name "kind") (Scan.lift Args.name >> Thm.kind) "theorem kind" #>
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  setup (Binding.name "COMP") COMP_att "direct composition with rules (no lifting)" #>
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  setup (Binding.name "THEN") THEN_att "resolution with rule" #>
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  setup (Binding.name "OF") OF_att "rule applied to facts" #>
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  setup (Binding.name "rename_abs") (Scan.lift rename_abs)
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    "rename bound variables in abstractions" #>
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  setup (Binding.name "unfolded") unfolded "unfolded definitions" #>
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  setup (Binding.name "folded") folded "folded definitions" #>
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  setup (Binding.name "consumes") (Scan.lift (Scan.optional P.nat 1) >> Rule_Cases.consumes)
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    "number of consumed facts" #>
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  setup (Binding.name "constraints") (Scan.lift P.nat >> Rule_Cases.constraints)
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    "number of equality constraints" #>
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  setup (Binding.name "case_names") (Scan.lift (Scan.repeat1 Args.name) >> Rule_Cases.case_names)
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    "named rule cases" #>
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  setup (Binding.name "case_conclusion")
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    (Scan.lift (Args.name -- Scan.repeat Args.name) >> Rule_Cases.case_conclusion)
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    "named conclusion of rule cases" #>
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  setup (Binding.name "params")
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    (Scan.lift (P.and_list1 (Scan.repeat Args.name)) >> Rule_Cases.params)
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    "named rule parameters" #>
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  setup (Binding.name "standard") (Scan.succeed (Thm.rule_attribute (K Drule.export_without_context)))
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    "result put into standard form (legacy)" #>
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  setup (Binding.name "rule_format") rule_format "result put into canonical rule format" #>
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  setup (Binding.name "elim_format") (Scan.succeed elim_format)
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    "destruct rule turned into elimination rule format" #>
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  setup (Binding.name "no_vars") (Scan.succeed no_vars) "frozen schematic vars" #>
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  setup (Binding.name "eta_long") (Scan.succeed eta_long)
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    "put theorem into eta long beta normal form" #>
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  setup (Binding.name "atomize") (Scan.succeed ObjectLogic.declare_atomize)
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    "declaration of atomize rule" #>
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  setup (Binding.name "rulify") (Scan.succeed ObjectLogic.declare_rulify)
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    "declaration of rulify rule" #>
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  setup (Binding.name "rotated") (Scan.lift rotated) "rotated theorem premises" #>
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  setup (Binding.name "defn") (add_del Local_Defs.defn_add Local_Defs.defn_del)
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    "declaration of definitional transformations" #>
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  setup (Binding.name "abs_def") (Scan.succeed (Thm.rule_attribute (K Drule.abs_def)))
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    "abstract over free variables of a definition"));
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(** configuration options **)
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(* naming *)
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structure Configs = Theory_Data
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(
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  type T = Config.value Config.T Symtab.table;
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  val empty = Symtab.empty;
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  val extend = I;
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  fun merge data = Symtab.merge (K true) data;
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);
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fun print_configs ctxt =
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  let
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    val thy = ProofContext.theory_of ctxt;
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    fun prt (name, config) =
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      let val value = Config.get ctxt config in
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        Pretty.block [Pretty.str (name ^ ": " ^ Config.print_type value ^ " ="), Pretty.brk 1,
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          Pretty.str (Config.print_value value)]
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      end;
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    val configs = Name_Space.extern_table (#1 (Attributes.get thy), Configs.get thy);
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  in Pretty.writeln (Pretty.big_list "configuration options" (map prt configs)) end;
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(* concrete syntax *)
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local
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val equals = P.$$$ "=";
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fun scan_value (Config.Bool _) =
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      equals -- Args.$$$ "false" >> K (Config.Bool false) ||
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      equals -- Args.$$$ "true" >> K (Config.Bool true) ||
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      Scan.succeed (Config.Bool true)
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  | scan_value (Config.Int _) = equals |-- P.int >> Config.Int
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  | scan_value (Config.String _) = equals |-- Args.name >> Config.String;
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fun scan_config thy config =
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  let val config_type = Config.get_thy thy config
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  in scan_value config_type >> (K o Thm.declaration_attribute o K o Config.put_generic config) end;
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in
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fun register_config config thy =
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  let
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    val bname = Config.name_of config;
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    val name = Sign.full_bname thy bname;
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  in
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    thy
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    |> setup (Binding.name bname) (Scan.lift (scan_config thy config) >> Morphism.form)
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      "configuration option"
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    |> Configs.map (Symtab.update (name, config))
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  end;
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fun declare_config make coerce global name default =
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  let
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    val config_value = Config.declare global name (make default);
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    val config = coerce config_value;
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  in (config, register_config config_value) end;
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val config_bool   = declare_config Config.Bool Config.bool false;
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val config_int    = declare_config Config.Int Config.int false;
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val config_string = declare_config Config.String Config.string false;
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val config_bool_global   = declare_config Config.Bool Config.bool true;
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val config_int_global    = declare_config Config.Int Config.int true;
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val config_string_global = declare_config Config.String Config.string true;
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end;
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(* theory setup *)
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val _ = Context.>> (Context.map_theory
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 (register_config Unify.trace_bound_value #>
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  register_config Unify.search_bound_value #>
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  register_config Unify.trace_simp_value #>
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  register_config Unify.trace_types_value #>
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  register_config MetaSimplifier.simp_depth_limit_value));
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end;