src/HOL/Library/Code_Char.thy

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/HOL/Library/Code_Char.thy	Fri Oct 12 10:26:18 2007 +0200
@@ -0,0 +1,50 @@
+(*  Title:      HOL/Library/Code_Char.thy
+    ID:         $Id$
+    Author:     Florian Haftmann
+*)
+
+header {* Code generation of pretty characters (and strings) *}
+
+theory Code_Char
+imports List
+begin
+
+code_type char
+  (SML "char")
+  (OCaml "char")
+  (Haskell "Char")
+
+setup {*
+let
+  val charr = @{const_name Char}
+  val nibbles = [@{const_name Nibble0}, @{const_name Nibble1},
+    @{const_name Nibble2}, @{const_name Nibble3},
+    @{const_name Nibble4}, @{const_name Nibble5},
+    @{const_name Nibble6}, @{const_name Nibble7},
+    @{const_name Nibble8}, @{const_name Nibble9},
+    @{const_name NibbleA}, @{const_name NibbleB},
+    @{const_name NibbleC}, @{const_name NibbleD},
+    @{const_name NibbleE}, @{const_name NibbleF}];
+in
+  fold (fn target => CodeTarget.add_pretty_char target charr nibbles)
+    ["SML", "OCaml", "Haskell"]
+  #> CodeTarget.add_pretty_list_string "Haskell"
+    @{const_name Nil} @{const_name Cons} charr nibbles
+end
+*}
+
+code_instance char :: eq
+  (Haskell -)
+
+code_reserved SML
+  char
+
+code_reserved OCaml
+  char
+
+code_const "op = \<Colon> char \<Rightarrow> char \<Rightarrow> bool"
+  (SML "!((_ : char) = _)")
+  (OCaml "!((_ : char) = _)")
+  (Haskell infixl 4 "==")
+
+end