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// This file is part of hnefatafl-copenhagen.
//
// hnefatafl-copenhagen is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// hnefatafl-copenhagen is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// SPDX-License-Identifier: AGPL-3.0-or-later
// SPDX-FileCopyrightText: 2025 David Campbell <david@hnefatafl.org>
use std::fmt;
use serde::{Deserialize, Serialize};
use crate::role::Role;
#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
pub enum Space {
Empty,
Attacker,
King,
Defender,
}
impl Space {
#[must_use]
pub fn display_ascii(&self) -> &str {
match self {
Self::Attacker => "A",
Self::Empty => ".",
Self::King => "K",
Self::Defender => "D",
impl TryFrom<char> for Space {
type Error = anyhow::Error;
fn try_from(value: char) -> anyhow::Result<Self> {
match value {
'X' => Ok(Self::Attacker),
'O' => Ok(Self::Defender),
'.' => Ok(Self::Empty),
'K' => Ok(Self::King),
ch => Err(anyhow::Error::msg(format!(
"Error trying to convert '{ch}' to a Space!"
))),
impl fmt::Display for Space {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
Self::Attacker => write!(f, "♟"),
Self::Empty => write!(f, "."),
Self::King => write!(f, "♔"),
Self::Defender => write!(f, "♙"),
impl From<Space> for Role {
fn from(space: Space) -> Self {
match space {
Space::Attacker => Role::Attacker,
Space::Defender | Space::King => Role::Defender,
Space::Empty => Role::Roleless,
impl TryFrom<Space> for usize {
fn try_from(space: Space) -> Result<usize, anyhow::Error> {
Space::Attacker => Ok(0),
Space::Defender => Ok(1),
Space::King => Ok(2),
Space::Empty => Err(anyhow::Error::msg(
"we should not try to get a usize for an empty space",
)),