// Copied from regex_syntax crate to avoid pulling in the whole crate just for a utility function
// https://github.com/rust-lang/regex/blob/ff283badce21dcebd581909d38b81f2c8c9bfb54/regex-syntax/src/lib.rs

pub fn escape(text: &str) -> String {
    let mut quoted = String::new();
    escape_into(text, &mut quoted);
    quoted
}

fn escape_into(text: &str, buf: &mut String) {
    buf.reserve(text.len());
    for c in text.chars() {
        if is_meta_character(c) {
            buf.push('\\');
        }
        buf.push(c);
    }
}

fn is_meta_character(c: char) -> bool {
    match c {
        '\\' | '.' | '+' | '*' | '?' | '(' | ')' | '|' | '[' | ']' | '{' | '}' | '^' | '$'
        | '#' | '&' | '-' | '~' => true,
        _ => false,
    }
}