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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, str::FromStr};
use serde::{Deserialize, Serialize};
#[derive(
Clone, Copy, Debug, Default, Deserialize, Eq, Hash, Ord, PartialEq, PartialOrd, Serialize,
)]
pub enum Role {
#[default]
Attacker,
Defender,
Roleless,
}
impl Role {
#[must_use]
pub fn opposite(&self) -> Self {
match self {
Self::Attacker => Self::Defender,
Self::Defender => Self::Attacker,
Self::Roleless => Self::Roleless,
impl fmt::Display for Role {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
Role::Attacker => write!(f, "attacker"),
Role::Defender => write!(f, "defender"),
Role::Roleless => write!(f, "roleless"),
impl FromStr for Role {
type Err = anyhow::Error;
fn from_str(string: &str) -> anyhow::Result<Self> {
let string = string.to_lowercase();
match string.as_str() {
"a" | "attacker" => Ok(Self::Attacker),
"d" | "defender" => Ok(Self::Defender),
_ => Err(anyhow::Error::msg(format!(
"Error trying to convert '{string}' to a Role!"
))),