(* Title: HOL/Library/Code_Char.thy
Author: Florian Haftmann
*)
header {* Code generation of pretty characters (and strings) *}
theory Code_Char
imports List Code_Evaluation Main
begin
code_type char
(SML "char")
(OCaml "char")
(Haskell "Char")
setup {*
fold String_Code.add_literal_char ["SML", "OCaml", "Haskell"]
#> String_Code.add_literal_list_string "Haskell"
*}
code_instance char :: eq
(Haskell -)
code_reserved SML
char
code_reserved OCaml
char
code_const "eq_class.eq \<Colon> char \<Rightarrow> char \<Rightarrow> bool"
(SML "!((_ : char) = _)")
(OCaml "!((_ : char) = _)")
(Haskell infixl 4 "==")
code_const "Code_Evaluation.term_of \<Colon> char \<Rightarrow> term"
(Eval "HOLogic.mk'_char/ (IntInf.fromInt/ (Char.ord/ _))")
definition implode :: "string \<Rightarrow> String.literal" where
"implode = STR"
primrec explode :: "String.literal \<Rightarrow> string" where
"explode (STR s) = s"
lemma [code]:
"literal_case f s = f (explode s)"
"literal_rec f s = f (explode s)"
by (cases s, simp)+
code_reserved SML String
code_const implode
(SML "String.implode")
(OCaml "failwith/ \"implode\"")
(Haskell "_")
code_const explode
(SML "String.explode")
(OCaml "failwith/ \"explode\"")
(Haskell "_")
end