shogi_usi_parser 0.1.0

Conversion from strings in USI format
Documentation 
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use shogi_core::Color;

use crate::{Error, FromUsi, Result};

/// ```
/// # use shogi_core::Color;
/// use shogi_usi_parser::FromUsi;
/// assert_eq!(Color::from_usi_lite("b"), Some(Color::Black));
/// assert_eq!(Color::from_usi_lite("w"), Some(Color::White));
/// assert_eq!(Color::from_usi_lite("B"), None); // uppercase letters not allowed
/// ```
impl FromUsi for Color {
    fn parse_usi_slice(s: &[u8]) -> Result<(&[u8], Self)> {
        if let Some((&first, s)) = s.split_first() {
            if first == b'b' {
                return Ok((s, Color::Black));
            }
            if first == b'w' {
                return Ok((s, Color::White));
            }
            Err(Error::InvalidInput {
                from: 0,
                to: 1,
                description: "A `Color` (`b` or `w`) expected, but invalid byte found",
            })
        } else {
            Err(Error::InvalidInput {
                from: 0,
                to: 0,
                description: "A `Color` expected, but nothing found",
            })
        }
    }
}