//! This module provides a primitive hash function.

/// A primitive hash function for matching opcodes.

pub fn simple_hash(s: &str) -> usize {

    let mut h: u32 = 5381;

    for c in s.chars() {

        h = (h ^ c as u32).wrapping_add(h.rotate_right(6));

    }

    h as usize

}

#[cfg(test)]

mod tests {

    use super::simple_hash;

    #[test]

    fn basic() {

        assert_eq!(simple_hash("Hello"), 0x2fa70c01);

        assert_eq!(simple_hash("world"), 0x5b0c31d5);

    }

}