diff -r 3f824514ad88 -r ee7c198a2154 src/Pure/Isar/attrib.ML
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Pure/Isar/attrib.ML	Mon Nov 09 15:32:20 1998 +0100
@@ -0,0 +1,156 @@
+(*  Title:      Pure/Isar/attrib.ML
+    ID:         $Id$
+    Author:     Markus Wenzel, TU Muenchen
+
+Symbolic theorem attributes.
+*)
+
+signature BASIC_ATTRIB =
+sig
+  val print_attributes: theory -> unit
+end;
+
+signature ATTRIB =
+sig
+  include BASIC_ATTRIB
+  val global_attribute: theory -> Args.src -> theory attribute
+  val local_attribute: theory -> Args.src -> Proof.context attribute
+  val add_attributes: (bstring * ((Args.src -> theory attribute) *
+      (Args.src -> Proof.context attribute)) * string) list -> theory -> theory
+  val syntax: (Args.T list -> 'a * Args.T list) -> ('a -> 'b) -> Args.src -> 'b
+  val no_args: 'a attribute -> Args.src -> 'a attribute
+  val thm_args: ('a -> string list -> tthm list)
+    -> (tthm list -> 'a attribute) -> Args.src -> 'a attribute
+  val global_thm_args: (tthm list -> theory attribute) -> Args.src -> theory attribute
+  val local_thm_args: (tthm list -> Proof.context attribute)
+    -> Args.src -> Proof.context attribute
+  val setup: (theory -> theory) list
+end;
+
+structure Attrib: ATTRIB =
+struct
+
+
+(** attributes theory data **)
+
+(* data kind 'Isar/attributes' *)
+
+structure AttributesDataArgs =
+struct
+  val name = "Isar/attributes";
+  type T =
+    {space: NameSpace.T,
+     attrs:
+       ((((Args.src -> theory attribute) * (Args.src -> Proof.context attribute))
+         * string) * stamp) Symtab.table};
+
+  val empty = {space = NameSpace.empty, attrs = Symtab.empty};
+  val prep_ext = I;
+
+  fun merge ({space = space1, attrs = attrs1}, {space = space2, attrs = attrs2}) =
+    {space = NameSpace.merge (space1, space2),
+      attrs = Symtab.merge eq_snd (attrs1, attrs2) handle Symtab.DUPS dups =>
+        error ("Attempt to merge different versions of attributes " ^ commas_quote dups)};
+
+  fun print _ ({space, attrs}) =
+    let
+      fun prt_attr (name, ((_, comment), _)) = Pretty.block
+        [Pretty.str (NameSpace.cond_extern space name ^ ":"), Pretty.brk 2, Pretty.str comment];
+    in
+      Pretty.writeln (Display.pretty_name_space ("attribute name space", space));
+      Pretty.writeln (Pretty.big_list "attributes:" (map prt_attr (Symtab.dest attrs)))
+    end;
+end;
+
+structure AttributesData = TheoryDataFun(AttributesDataArgs);
+val print_attributes = AttributesData.print;
+
+
+(* get global / local attributes *)
+
+fun gen_attribute which thy =
+  let
+    val {space, attrs} = AttributesData.get thy;
+
+    fun attr ((raw_name, args), pos) =
+      let val name = NameSpace.intern space raw_name in
+        (case Symtab.lookup (attrs, name) of
+          None => error ("Unknown attribute: " ^ quote name ^ Position.str_of pos)
+        | Some ((p, _), _) => which p ((name, args), pos))
+      end;
+  in attr end;
+
+val global_attribute = gen_attribute fst;
+val local_attribute = gen_attribute snd;
+
+
+(* add_attributes *)
+
+fun add_attributes raw_attrs thy =
+  let
+    val full = Sign.full_name (Theory.sign_of thy);
+    val new_attrs =
+      map (fn (name, (f, g), comment) => (full name, (((f, g), comment), stamp ()))) raw_attrs;
+
+    val {space, attrs} = AttributesData.get thy;
+    val space' = NameSpace.extend (space, map fst new_attrs);
+    val attrs' = Symtab.extend (attrs, new_attrs) handle Symtab.DUPS dups =>
+      error ("Duplicate declaration of attributes(s) " ^ commas_quote dups);
+  in thy |> AttributesData.put {space = space', attrs = attrs'} end;
+
+
+(* attribute syntax *)
+
+val attributeN = "attribute";
+fun syntax scan = Args.syntax attributeN scan;
+
+fun no_args x = syntax (Scan.succeed x) I;
+
+fun thm_args get f = syntax (Scan.repeat Args.name)
+  (fn names => fn (x, ths) => f (get x names) (x, ths));
+
+fun global_thm_args f = thm_args PureThy.get_tthmss f;
+fun local_thm_args f = thm_args ProofContext.get_tthmss f;
+
+
+
+(** Pure attributes **)
+
+(* tags *)
+
+fun gen_tag x = syntax (Args.name -- Scan.repeat Args.name) Attribute.tag x;
+fun gen_untag x = syntax (Args.name -- Scan.repeat Args.name) Attribute.untag x;
+fun gen_lemma x = no_args Attribute.tag_lemma x;
+fun gen_assumption x = no_args Attribute.tag_assumption x;
+
+
+(* resolution *)
+
+fun gen_RS get = syntax Args.name
+  (fn name => fn (x, (thm, tags)) => (x, (thm RS (Attribute.thm_of (get x name)), tags)));
+
+fun RS_global x = gen_RS PureThy.get_tthm x;
+fun RS_local x = gen_RS ProofContext.get_tthm x;
+
+
+(* pure_attributes *)
+
+val pure_attributes =
+ [("tag", (gen_tag, gen_tag), "tag theorem"),
+  ("untag", (gen_untag, gen_untag), "untag theorem"),
+  ("lemma", (gen_lemma, gen_lemma), "tag as lemma"),
+  ("assumption", (gen_assumption, gen_assumption), "tag as assumption"),
+  ("RS", (RS_global, RS_local), "resolve with rule")];
+
+
+
+(** theory setup **)
+
+val setup = [AttributesData.init, add_attributes pure_attributes];
+
+
+end;
+
+
+structure BasicAttrib: BASIC_ATTRIB = Attrib;
+open BasicAttrib;