| pub fn remove_to<'s, P>(s: &'s str, pattern: P) -> &'s str |
| where |
| P: Fn(char) -> bool, |
| { |
| match s.rfind(pattern) { |
| Some(pos) => &s[(pos + 1)..], |
| None => s, |
| } |
| } |
| |
| pub fn remove_suffix<'s>(s: &'s str, suffix: &str) -> &'s str { |
| if !s.ends_with(suffix) { |
| s |
| } else { |
| &s[..(s.len() - suffix.len())] |
| } |
| } |
| |
| pub fn capitalize(s: &str) -> String { |
| if s.is_empty() { |
| return String::new(); |
| } |
| let mut char_indices = s.char_indices(); |
| char_indices.next().unwrap(); |
| match char_indices.next() { |
| None => s.to_uppercase(), |
| Some((i, _)) => s[..i].to_uppercase() + &s[i..], |
| } |
| } |
| |
| #[cfg(test)] |
| mod test { |
| |
| use super::capitalize; |
| use super::remove_suffix; |
| use super::remove_to; |
| |
| #[test] |
| fn test_remove_to() { |
| assert_eq!("aaa", remove_to("aaa", |c| c == '.')); |
| assert_eq!("bbb", remove_to("aaa.bbb", |c| c == '.')); |
| assert_eq!("ccc", remove_to("aaa.bbb.ccc", |c| c == '.')); |
| } |
| |
| #[test] |
| fn test_remove_suffix() { |
| assert_eq!("bbb", remove_suffix("bbbaaa", "aaa")); |
| assert_eq!("aaa", remove_suffix("aaa", "bbb")); |
| } |
| |
| #[test] |
| fn test_capitalize() { |
| assert_eq!("", capitalize("")); |
| assert_eq!("F", capitalize("f")); |
| assert_eq!("Foo", capitalize("foo")); |
| } |
| } |