chessground12/dist/predrop.js

Extended lishuuro.org Chess UI

import { allPos, pos2key } from './util';
const wholeBoard = () => true;
export function predrop(pieces, piece, geom, variant) {
    const color = piece.color;
    // Pieces can be dropped anywhere on the board by default.
    // Mobility will be modified based on variant and piece to match the game rule.
    const mobility = wholeBoard;
    switch (variant) {
        default:
            console.warn('Unknown drop variant', variant);
    }
    let keys = allPos(geom)
        .filter(pos => pieces.get(pos2key(pos))?.color !== color && mobility(pos[0], pos[1]))
        .map(pos2key);
    return keys;
}
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