puzzle_engine 0.4.8

An engine for puzzles.
Documentation 
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use std::fmt;

/// Represents a square on the chess board (e.g., E2, A1).
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
pub struct Position {
    pub file: char, // 'a' - 'h'
    pub rank: u8,   // 1 - 8
}

impl Position {
    #[must_use]
    pub fn new(file: char, rank: u8) -> Option<Self> {
        if ('a'..='h').contains(&file) && (1..=8).contains(&rank) {
            Some(Self { file, rank })
        } else {
            None
        }
    }
}

impl fmt::Display for Position {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "{}{}", self.file, self.rank)
    }
}