(*  Title:      HOL/Library/Code_Char.thy

     ID:         $Id$

     Author:     Florian Haftmann

 *)

 header {* Code generation of pretty characters (and strings) *}

 theory Code_Char

 imports Plain "~~/src/HOL/List"

 begin

 declare char.recs [code func del] char.cases [code func del]

 lemma [code func]:

   "size (c\<Colon>char) = 0"

   by (cases c) simp

 lemma [code func]:

   "char_size (c\<Colon>char) = 0"

   by (cases c) simp

 code_type char

   (SML "char")

   (OCaml "char")

   (Haskell "Char")

 setup {*

   fold (fn target => add_literal_char target) ["SML", "OCaml", "Haskell"] 

   #> add_literal_list_string "Haskell"

 *}

 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