Up to index of Isabelle/HOL/Library
theory Code_Char_chr(* Title: HOL/Library/Code_Char_chr.thy Author: Florian Haftmann *) header {* Code generation of pretty characters with character codes *} theory Code_Char_chr imports Char_nat Code_Char Code_Integer Main begin definition "int_of_char = int o nat_of_char" lemma [code]: "nat_of_char = nat o int_of_char" unfolding int_of_char_def by (simp add: expand_fun_eq) definition "char_of_int = char_of_nat o nat" lemma [code]: "char_of_nat = char_of_int o int" unfolding char_of_int_def by (simp add: expand_fun_eq) lemmas [code del] = char.recs char.cases char.size lemma [code, code inline]: "char_rec f c = split f (nibble_pair_of_nat (nat_of_char c))" by (cases c) (auto simp add: nibble_pair_of_nat_char) lemma [code, code inline]: "char_case f c = split f (nibble_pair_of_nat (nat_of_char c))" by (cases c) (auto simp add: nibble_pair_of_nat_char) lemma [code]: "size (c::char) = 0" by (cases c) auto code_const int_of_char and char_of_int (SML "!(IntInf.fromInt o Char.ord)" and "!(Char.chr o IntInf.toInt)") (OCaml "Big'_int.big'_int'_of'_int (Char.code _)" and "Char.chr (Big'_int.int'_of'_big'_int _)") (Haskell "toInteger (fromEnum (_ :: Char))" and "!(let chr k | k < 256 = toEnum k :: Char in chr . fromInteger)") end