tvix/nix-compat/src/derivation/escape.rs


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use bstr::{BString, ByteSlice};

/// Escapes a byte sequence. Does not add surrounding quotes.
pub fn escape_bstr<P: AsRef<[u8]>>(s: P) -> BString {
    let mut s: Vec<u8> = s.as_ref().to_vec();

    s = s.replace(b"\\", b"\\\\");
    s = s.replace(b"\n", b"\\n");
    s = s.replace(b"\r", b"\\r");
    s = s.replace(b"\t", b"\\t");
    s = s.replace(b"\"", b"\\\"");

    s.into()
}

#[cfg(test)]
mod tests {
    use super::escape_bstr;
    use test_case::test_case;

    #[test_case(b"", b""; "empty")]
    #[test_case(b"\"", b"\\\""; "doublequote")]
    #[test_case(b":", b":"; "colon")]
    fn escape(input: &[u8], expected: &[u8]) {
        assert_eq!(expected, escape_bstr(input))
    }
}