shahdlala66
39 lines
997 B
TypeScript
39 lines
997 B
TypeScript
import { GameTurn } from '../../models/game.models';
|
|
|
|
export function getPieceAtSquare(fen: string, targetSquare: string): string | null {
|
|
const placement = fen.split(' ')[0] ?? '';
|
|
const rows = placement.split('/');
|
|
if (rows.length !== 8 || targetSquare.length !== 2) {
|
|
return null;
|
|
}
|
|
|
|
const file = targetSquare.charCodeAt(0) - 97;
|
|
const rank = Number(targetSquare[1]);
|
|
const rowIndex = 8 - rank;
|
|
|
|
if (Number.isNaN(rank) || file < 0 || file > 7 || rowIndex < 0 || rowIndex > 7) {
|
|
return null;
|
|
}
|
|
|
|
let column = 0;
|
|
for (const symbol of rows[rowIndex]) {
|
|
if (symbol >= '1' && symbol <= '8') {
|
|
column += Number(symbol);
|
|
continue;
|
|
}
|
|
|
|
if (column === file) {
|
|
return symbol;
|
|
}
|
|
|
|
column += 1;
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
export function isPieceColor(pieceCode: string, turn: GameTurn): boolean {
|
|
const isWhitePiece = pieceCode === pieceCode.toUpperCase();
|
|
return (turn === 'white' && isWhitePiece) || (turn === 'black' && !isWhitePiece);
|
|
}
|