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/// Returns the substring before the last occurrence of a specified `substr` in the source string.
///
/// # Arguments
///
/// * `s` - The input string to perform before_last operation.
/// * `substr` - The substring to look for the last occurrence in `s`.
///
/// # Returns
///
/// Returns the substring before the last occurrence of `substr` in `s`.
///
/// # Examples
///
/// ```
/// use rufl::string;
///
/// let foo = string::before_last("foo", "o");
/// assert_eq!("fo", foo);
///
/// let bar = string::before_last("bar", "a");
/// assert_eq!("b", bar);
///
/// let boo = string::before_last("boo", "c");
/// assert_eq!("boo", boo);
///
/// ```
pub fn before_last(s: impl AsRef<str>, substr: &str) -> String {
match s.as_ref().rfind(substr) {
Some(index) => s.as_ref()[..index].to_string(),
None => s.as_ref().to_string(),
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_before_last() {
assert_eq!("", before_last("foo", "foo"));
assert_eq!("foo", before_last("foo", ""));
assert_eq!("fo", before_last("foo", "o"));
assert_eq!("foo/bar", before_last("foo/bar/boo", "/"));
assert_eq!("你好rust", before_last("你好rust你好", "你好"));
assert_eq!(
"Jsem počítačový programátor ",
before_last("Jsem počítačový programátor počítačový rust", "počítačový")
);
}
}