tex-fmt 0.4.3

LaTeX formatter written in Rust
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//! Utilities for finding, extracting and removing LaTeX comments

/// Find the location where a comment begins in a line
pub fn find_comment_index(line: &str) -> Option<usize> {
    // no percent means no comment
    if !line.contains('%') {
        return None;
    }

    let n = line.chars().count();

    // empty line has no comment
    if n == 0 {
        return None;
    }

    // check the first character
    let mut prev_c: char = line.chars().next().unwrap();
    if prev_c == '%' {
        return Some(0);
    }

    // single-character line
    if n == 1 {
        return None;
    }

    // multi-character line
    for i in 1..n {
        let c = line.chars().nth(i).unwrap();
        if c == '%' && (prev_c == ' ' || prev_c != '\\') {
            return Some(i);
        }
        prev_c = c;
    }
    None
}

/// Remove a comment from the end of a line
pub fn remove_comment(line: &str, comment: Option<usize>) -> String {
    comment.map_or_else(|| line.to_string(), |c| line.chars().take(c).collect())
}

/// Extract a comment from the end of a line
pub fn get_comment(line: &str, comment: Option<usize>) -> String {
    comment.map_or_else(String::new, |c| line.chars().skip(c).collect())
}