misc-conf 0.1.2

Nom parser for nginx/apache configuration
Documentation 
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//! Common lexer utils

#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub struct Literal<'a> {
    pub raw: &'a str,
    pub quote: u8,
}

impl<'a> std::fmt::Display for Literal<'a> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}", Into::<String>::into(*self))
    }
}

// TODO: performance

impl<'a> From<Literal<'a>> for String {
    fn from(value: Literal<'a>) -> Self {
        let Literal { raw, quote } = value;
        let mut s = raw.replace(r#"\\"#, "\\");
        if quote == b'"' {
            s = s.replace(r#"\""#, "\"");
        } else if quote == b'\'' {
            s = s.replace(r#"\'"#, "'");
        }
        s.replace("\\\n", "\n")
    }
}

pub fn line_column(data: &[u8], pos: usize) -> (usize, usize) {
    let mut ln = 1;
    for line in data.split(|&b| b == b'\n') {
        let lp = (line.as_ptr() as usize)
            .checked_sub(data.as_ptr() as usize)
            .expect("sub ptr");
        if (lp..=lp + line.len()).contains(&pos) {
            return (ln, pos - lp);
        }
        ln += 1;
    }
    (ln, 0)
}

pub fn line_column2(data: &[u8], err: &[u8]) -> Option<((usize, usize), usize)> {
    let pos = (err.as_ptr() as usize).checked_sub(data.as_ptr() as usize)?;
    Some((line_column(data, pos), pos))
}