diff -r f04b33ce250f -r a4dc62a46ee4 ex/String.thy
--- a/ex/String.thy	Tue Oct 24 14:59:17 1995 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,90 +0,0 @@
-(*  Title:      HOL/String.thy
-    ID:         $Id$
-
-Hex chars. Strings.
-*)
-
-String = List +
-
-datatype
-  nibble = H00 | H01 | H02 | H03 | H04 | H05 | H06 | H07
-         | H08 | H09 | H0A | H0B | H0C | H0D | H0E | H0F
-
-datatype
-  char = Char (nibble, nibble)
-
-types
-  string = "char list"
-
-syntax
-  "_Char"       :: "xstr => char"       ("CHR _")
-  "_String"     :: "xstr => string"     ("_")
-
-end
-
-
-ML
-
-local
-  open Syntax;
-
-  val ssquote = enclose "''" "''";
-
-
-  (* chars *)
-
-  val zero = ord "0";
-  val ten = ord "A" - 10;
-
-  fun mk_nib n =
-    const ("H0" ^ chr (n + (if n <= 9 then zero else ten)));
-
-  fun dest_nib (Const (c, _)) =
-        (case explode c of
-          ["H", "0", h] => ord h - (if h <= "9" then zero else ten)
-        | _ => raise Match)
-    | dest_nib _ = raise Match;
-
-  fun dest_nibs t1 t2 = chr (dest_nib t1 * 16 + dest_nib t2);
-
-
-  fun mk_char c =
-    const "Char" $ mk_nib (ord c div 16) $ mk_nib (ord c mod 16);
-
-  fun dest_char (Const ("Char", _) $ t1 $ t2) = dest_nibs t1 t2
-    | dest_char _ = raise Match;
-
-
-  fun char_tr (*"_Char"*) [Free (c, _)] =
-        if size c = 1 then mk_char c
-        else error ("Bad character: " ^ quote c)
-    | char_tr (*"_Char"*) ts = raise_term "char_tr" ts;
-
-  fun char_tr' (*"Char"*) [t1, t2] =
-        const "_Char" $ free (ssquote (dest_nibs t1 t2))
-    | char_tr' (*"Char"*) _ = raise Match;
-
-
-  (* strings *)
-
-  fun mk_string [] = const constrainC $ const "[]" $ const "string"
-    | mk_string (t :: ts) = const "op #" $ t $ mk_string ts;
-
-  fun dest_string (Const ("[]", _)) = []
-    | dest_string (Const ("op #", _) $ c $ cs) = dest_char c :: dest_string cs
-    | dest_string _ = raise Match;
-
-
-  fun string_tr (*"_String"*) [Free (txt, _)] =
-        mk_string (map mk_char (explode txt))
-    | string_tr (*"_String"*) ts = raise_term "string_tr" ts;
-
-  fun cons_tr' (*"op #"*) [c, cs] =
-        const "_String" $ free (ssquote (implode (dest_char c :: dest_string cs)))
-    | cons_tr' (*"op #"*) ts = raise Match;
-
-in
-  val parse_translation = [("_Char", char_tr), ("_String", string_tr)];
-  val print_translation = [("Char", char_tr'), ("op #", cons_tr')];
-end;
-