Iterate over lines in a string, including the newline characters

Question

I need to iterate over lines in a string, but keep the newlines at the end in the strings that are yielded.

There is str.lines(), but the strings it returns have the

Answer 1

The solution I currently have looks like this:

/// Iterator yielding every line in a string. The line includes newline character(s).
pub struct LinesWithEndings<'a> {
    input: &'a str,
}

impl<'a> LinesWithEndings<'a> {
    pub fn from(input: &'a str) -> LinesWithEndings<'a> {
        LinesWithEndings {
            input: input,
        }
    }
}

impl<'a> Iterator for LinesWithEndings<'a> {
    type Item = &'a str;

    #[inline]
    fn next(&mut self) -> Option<&'a str> {
        if self.input.is_empty() {
            return None;
        }
        let split = self.input.find('\n').map(|i| i + 1).unwrap_or(self.input.len());
        let (line, rest) = self.input.split_at(split);
        self.input = rest;
        Some(line)
    }
}