--- a/src/Pure/Isar/proof_context.ML Thu Nov 08 00:26:06 2001 +0100
+++ b/src/Pure/Isar/proof_context.ML Thu Nov 08 00:26:41 2001 +0100
@@ -274,12 +274,60 @@
-
(** local syntax **)
val fixedN = "\\<^fixed>";
val structN = "\\<^struct>";
+fun the_struct structs i =
+ if 1 <= i andalso i <= length structs then Library.nth_elem (i - 1, structs)
+ else raise ERROR_MESSAGE ("Illegal reference to implicit structure #" ^ string_of_int i);
+
+
+(* print (ast) translations *)
+
+fun index_tr' 1 = Syntax.const "_noindex"
+ | index_tr' i = Syntax.const "_index" $ Syntax.const (Library.string_of_int i);
+
+fun context_tr' ctxt =
+ let
+ val (_, structs, mixfixed) = syntax_of ctxt;
+
+ fun tr' (t $ u) = tr' t $ tr' u
+ | tr' (Abs (x, T, t)) = Abs (x, T, tr' t)
+ | tr' (t as Free (x, T)) =
+ let val i = Library.find_index (equal x) structs + 1 in
+ if 1 <= i andalso i <= 9 then Syntax.const "_struct" $ index_tr' i
+ else if x mem_string mixfixed then Const (fixedN ^ x, T)
+ else t
+ end
+ | tr' a = a;
+ in tr' end;
+
+fun index_ast_tr' structs s =
+ (case Syntax.read_nat s of
+ Some i => Syntax.Variable (the_struct structs i handle ERROR_MESSAGE _ => raise Match)
+ | None => raise Match);
+
+fun struct_ast_tr' structs [Syntax.Constant "_noindex"] =
+ index_ast_tr' structs "1"
+ | struct_ast_tr' structs [Syntax.Appl [Syntax.Constant "_index", Syntax.Constant s]] =
+ index_ast_tr' structs s
+ | struct_ast_tr' _ _ = raise Match;
+
+
+(* parse translations *)
+
+fun fixed_tr x = (fixedN ^ x, curry Term.list_comb (Syntax.free x));
+
+fun index_tr (Const ("_noindex", _)) = 1
+ | index_tr (t as (Const ("_index", _) $ Const (s, _))) =
+ (case Syntax.read_nat s of Some n => n | None => raise TERM ("index_tr", [t]))
+ | index_tr t = raise TERM ("index_tr", [t]);
+
+fun struct_tr structs (idx :: ts) = Syntax.free (the_struct structs (index_tr idx))
+ | struct_tr _ ts = raise TERM ("struct_tr", ts);
+
(* add_syntax and syn_of *)
@@ -297,19 +345,6 @@
| prep_mixfix' (x, _, Some Syntax.NoSyn) = None
| prep_mixfix' (x, opt_T, _) = Some (x, mixfix x opt_T (Syntax.Delimfix x));
-fun fixed_tr x = (fixedN ^ x, curry Term.list_comb (Syntax.free x));
-
-fun index_tr (Const ("_structs", _) $ Const ("_struct", _) $ idx) = index_tr idx + 1
- | index_tr (Const ("_struct", _)) = 0
- | index_tr t = raise TERM ("index_tr", [t]);
-
-fun struct_app_tr structs [idx, f] =
- let val i = index_tr idx in
- if i < length structs then f $ Syntax.free (Library.nth_elem (i, structs))
- else error ("Illegal reference to structure #" ^ string_of_int (i + 1))
- end
- | struct_app_tr _ ts = raise TERM ("struct_app_tr", ts);
-
fun prep_struct (x, _, None) = Some x
| prep_struct _ = None;
@@ -329,31 +364,12 @@
in (thy, (syn', structs', fixed @ mixfixed), data, asms, binds, thms, cases, defs) end)
fun syn_of (Context {syntax = (syn, structs, _), ...}) =
- syn |> Syntax.extend_trfuns ([], [("_struct_app", struct_app_tr structs)], [], []);
-
+ syn |> Syntax.extend_trfuns
+ ([], [("_struct", struct_tr structs)], [], [("_struct", struct_ast_tr' structs)]);
end;
-(* context_tr' *)
-
-fun context_tr' (Context {syntax = (_, structs, mixfixed), ...}) =
- let
- fun structs_tr' 0 t = t
- | structs_tr' i t = Syntax.const "_structs" $ Syntax.const "_struct" $ structs_tr' (i - 1) t;
-
- fun tr' (f $ (t as Free (x, T))) =
- let val i = Library.find_index (equal x) structs in
- if i < 0 then tr' f $ tr' t
- else Syntax.const "_struct_app" $ structs_tr' i (Syntax.const "_struct") $ f
- end
- | tr' (t as Free (x, T)) = if x mem_string mixfixed then Const (fixedN ^ x, T) else t
- | tr' (t $ u) = tr' t $ tr' u
- | tr' (Abs (x, T, t)) = Abs (x, T, tr' t)
- | tr' a = a;
- in tr' end;
-
-
(** default sorts and types **)