escape_str.rs

fn escape_str<W: fmt::Write>(mut f: W, mut s: &str, replacements: &[(u8, &str)]) -> fmt::Result {
    while !s.is_empty() {
        let (idx, replacement) = s
            .as_bytes()
            .iter()
            .enumerate()
            .find_map(|(i, c)| {
                replacements
                    .iter()
                    .find(|(r, _)| c == r)
                    .map(|(_, replacement)| (i, *replacement))
            })
            .unwrap_or((s.len(), ""));
        write!(f, "{}{}", &s[..idx], replacement)?;
        s = &s[s.len().min(idx + 1)..];
    }
    Ok(())
}