--- a/src/HOL/ex/String.thy Fri Jul 03 11:02:01 1998 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,87 +0,0 @@
-(* Title: HOL/String.thy
- ID: $Id$
-
-Hex chars and 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
-
- (* chars *)
-
- val zero = ord "0";
- val ten = ord "A" - 10;
-
- fun mk_nib n =
- Syntax.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 =
- Syntax.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 (xstr, _)] =
- (case Syntax.explode_xstr xstr of
- [c] => mk_char c
- | _ => error ("Single character expected: " ^ xstr))
- | char_tr (*"_Char"*) ts = raise TERM ("char_tr", ts);
-
- fun char_tr' (*"Char"*) [t1, t2] =
- Syntax.const "_Char" $ Syntax.free (Syntax.implode_xstr [dest_nibs t1 t2])
- | char_tr' (*"Char"*) _ = raise Match;
-
-
- (* strings *)
-
- fun mk_string [] = Syntax.const Syntax.constrainC $ Syntax.const "[]" $ Syntax.const "string"
- | mk_string (t :: ts) = Syntax.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 (xstr, _)] =
- mk_string (map mk_char (Syntax.explode_xstr xstr))
- | string_tr (*"_String"*) ts = raise TERM ("string_tr", ts);
-
- fun cons_tr' (*"op #"*) [c, cs] =
- Syntax.const "_String" $
- Syntax.free (Syntax.implode_xstr (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;