(*  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