rot13加密算法

  1. pub fn rot13(text: &str) -> String {
  2.     let to_enc = text.to_uppercase();
  3.     to_enc
  4.         .chars()
  5.         .map(|c| match c {
  6.             'A'..='M' => ((c as u8) + 13) as char,
  7.             'N'..='Z' => ((c as u8) - 13) as char,
  8.             _ => c,
  9.         })
  10.         .collect()
  11. }
  13. #[cfg(test)]
  14. mod test {
  15.     use super::*;
  17.     #[test]
  18.     fn test_single_letter() {
  19.         assert_eq!("N", rot13("A"));
  20.     }
  22.     #[test]
  23.     fn test_bunch_of_letters() {
  24.         assert_eq!("NOP", rot13("ABC"));
  25.     }
  27.     #[test]
  28.     fn test_non_ascii() {
  29.         assert_eq!("😀NO", rot13("😀AB"));
  30.     }
  32.     #[test]
  33.     fn test_twice() {
  34.         assert_eq!("ABCD", rot13(&rot13("ABCD")));
  35.     }
  36. }