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use crate::internal::consts;
//===========================================================================//
/// The "color" of a directory entry (which can be used for maintaining a
/// red-black tree).
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Color {
Red,
Black,
}
impl Color {
pub fn as_byte(&self) -> u8 {
match self {
Color::Red => consts::COLOR_RED,
Color::Black => consts::COLOR_BLACK,
}
}
pub fn from_byte(byte: u8) -> Option<Color> {
if byte == consts::COLOR_RED {
Some(Color::Red)
} else if byte == consts::COLOR_BLACK {
Some(Color::Black)
} else {
None
}
}
}
//===========================================================================//
#[cfg(test)]
mod tests {
use super::Color;
#[test]
fn round_trip() {
for &color in &[Color::Red, Color::Black] {
assert_eq!(Color::from_byte(color.as_byte()), Some(color));
}
}
}
//===========================================================================//