(* Title: HOL/Library/Code_Char.thy
Author: Florian Haftmann
*)
header {* Code generation of pretty characters (and strings) *}
theory Code_Char
imports Main Char_ord
begin
code_printing
type_constructor char \<rightharpoonup>
(SML) "char"
and (OCaml) "char"
and (Haskell) "Prelude.Char"
and (Scala) "Char"
setup {*
fold String_Code.add_literal_char ["SML", "OCaml", "Haskell", "Scala"]
#> String_Code.add_literal_list_string "Haskell"
*}
code_printing
class_instance char :: equal \<rightharpoonup>
(Haskell) -
| constant "HOL.equal :: char \<Rightarrow> char \<Rightarrow> bool" \<rightharpoonup>
(SML) "!((_ : char) = _)"
and (OCaml) "!((_ : char) = _)"
and (Haskell) infix 4 "=="
and (Scala) infixl 5 "=="
| constant "Code_Evaluation.term_of \<Colon> char \<Rightarrow> term" \<rightharpoonup>
(Eval) "HOLogic.mk'_char/ (IntInf.fromInt/ (Char.ord/ _))"
code_reserved SML
char
code_reserved OCaml
char
code_reserved Scala
char
definition implode :: "string \<Rightarrow> String.literal" where
"implode = STR"
code_reserved SML String
code_printing
constant implode \<rightharpoonup>
(SML) "String.implode"
and (OCaml) "!(let l = _ in let res = String.create (List.length l) in let rec imp i = function | [] -> res | c :: l -> String.set res i c; imp (i + 1) l in imp 0 l)"
and (Haskell) "_"
and (Scala) "!(\"\" ++/ _)"
| constant explode \<rightharpoonup>
(SML) "String.explode"
and (OCaml) "!(let s = _ in let rec exp i l = if i < 0 then l else exp (i - 1) (String.get s i :: l) in exp (String.length s - 1) [])"
and (Haskell) "_"
and (Scala) "!(_.toList)"
definition integer_of_char :: "char \<Rightarrow> integer"
where
"integer_of_char = integer_of_nat o nat_of_char"
definition char_of_integer :: "integer \<Rightarrow> char"
where
"char_of_integer = char_of_nat \<circ> nat_of_integer"
lemma [code]:
"nat_of_char = nat_of_integer o integer_of_char"
by (simp add: integer_of_char_def fun_eq_iff)
lemma [code]:
"char_of_nat = char_of_integer o integer_of_nat"
by (simp add: char_of_integer_def fun_eq_iff)
lemmas integer_of_char_code [code] =
nat_of_char_simps[
THEN arg_cong[where f="integer_of_nat"],
unfolded integer_of_nat_numeral integer_of_nat_1 integer_of_nat_0,
folded fun_cong[OF integer_of_char_def, unfolded o_apply]]
lemma char_of_integer_code [code]:
"char_of_integer n = enum_class.enum ! (nat_of_integer n mod 256)"
by(simp add: char_of_integer_def char_of_nat_def)
code_printing
constant integer_of_char \<rightharpoonup>
(SML) "!(IntInf.fromInt o Char.ord)"
and (OCaml) "Big'_int.big'_int'_of'_int (Char.code _)"
and (Haskell) "Prelude.toInteger (Prelude.fromEnum (_ :: Prelude.Char))"
and (Scala) "BigInt(_.toInt)"
| constant char_of_integer \<rightharpoonup>
(SML) "!(Char.chr o IntInf.toInt)"
and (OCaml) "Char.chr (Big'_int.int'_of'_big'_int _)"
and (Haskell) "!(let chr k | (0 <= k && k < 256) = Prelude.toEnum k :: Prelude.Char in chr . Prelude.fromInteger)"
and (Scala) "!((k: BigInt) => if (BigInt(0) <= k && k < BigInt(256)) k.charValue else error(\"character value out of range\"))"
| constant "Orderings.less_eq :: char \<Rightarrow> char \<Rightarrow> bool" \<rightharpoonup>
(SML) "!((_ : char) <= _)"
and (OCaml) "!((_ : char) <= _)"
and (Haskell) infix 4 "<="
and (Scala) infixl 4 "<="
and (Eval) infixl 6 "<="
| constant "Orderings.less :: char \<Rightarrow> char \<Rightarrow> bool" \<rightharpoonup>
(SML) "!((_ : char) < _)"
and (OCaml) "!((_ : char) < _)"
and (Haskell) infix 4 "<"
and (Scala) infixl 4 "<"
and (Eval) infixl 6 "<"
| constant "Orderings.less_eq :: String.literal \<Rightarrow> String.literal \<Rightarrow> bool" \<rightharpoonup>
(SML) "!((_ : string) <= _)"
and (OCaml) "!((_ : string) <= _)"
-- {* Order operations for @{typ String.literal} work in Haskell only
if no type class instance needs to be generated, because String = [Char] in Haskell
and @{typ "char list"} need not have the same order as @{typ String.literal}. *}
and (Haskell) infix 4 "<="
and (Scala) infixl 4 "<="
and (Eval) infixl 6 "<="
| constant "Orderings.less :: String.literal \<Rightarrow> String.literal \<Rightarrow> bool" \<rightharpoonup>
(SML) "!((_ : string) < _)"
and (OCaml) "!((_ : string) < _)"
and (Haskell) infix 4 "<"
and (Scala) infixl 4 "<"
and (Eval) infixl 6 "<"
end