Theory Isabelle_Cartouche_Examples

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chapter‹Part ...›

theory Isabelle_Cartouche_Examples
imports Main
begin

ML ‹
(*  Title:      HOL/ex/Cartouche_Examples.thy
    Author:     Makarius
*)
  local
    fun mk_char (f_char, f_cons, _) (s, _) accu =
        fold
          (fn c => fn (accu, l) =>
            (f_char c accu, f_cons c l))
          (rev (map Char.ord (String.explode s)))
          accu;

    fun mk_string (_, _, f_nil) accu [] = (accu, f_nil)
      | mk_string f accu (s :: ss) = mk_char f s (mk_string f accu ss);
  in
    fun string_tr f f_mk accu content args =
      let fun err () = raise TERM ("string_tr", args) in
        (case args of
          [(c as Const (@{syntax_const "_constrain"}, _)) $ Free (s, _) $ p] =>
            (case Term_Position.decode_position p of
              SOME (pos, _) => c $ f (mk_string f_mk accu (content (s, pos))) $ p
            | NONE => err ())
        | _ => err ())
      end;
  end;
›

syntax "_cartouche_string" :: "cartouche_position ⇒ _"  ("_")

end