xchess/lib/game-color.js

Chess Engine

export {GameColor}

import {white, black} from './color.js'
import {INVALID_COLOR} from './errors.js'

class GameColor {

	static from(color){
		if(white.eq(color)) return White;
		if(black.eq(color)) return Black;
		throw INVALID_COLOR(color);
	}

	static get white(){
		return White;
	}

	static get black(){
		return Black;
	}

	get color(){
		return null;
	}

	invert(){
		return null;
	}

	// Castling

	wk(state){
		return null;
	}

	wq(state){
		return null;
	}

	bk(state){
		return null;
	}

	bq(state){
		return null;
	}
}

class WhiteGameColor extends GameColor {

	get color(){
		return white;
	}

	invert(){
		return Black;
	}

	// Castling

	wk({castling}){
		return castling.kingside;
	}

	wq({castling}){
		return castling.queenside;
	}

	bk({prevCastling}){
		return prevCastling.kingside;
	}

	bq({prevCastling}){
		return prevCastling.queenside;
	}
}

class BlackGameColor extends GameColor {

	get color(){
		return black;
	}

	invert(){
		return White;
	}

	// Castling

	wk({prevCastling}){
		return prevCastling.kingside;
	}

	wq({prevCastling}){
		return prevCastling.queenside;
	}

	bk({castling}){
		return castling.kingside;
	}

	bq({castling}){
		return castling.queenside;
	}
}

const White = new WhiteGameColor();
const Black = new BlackGameColor();