(*  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