44 lines
1.0 KiB
Swift
44 lines
1.0 KiB
Swift
final class Pawn: Piece {
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private var sign: Int8 {
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color == .Black ? -1 : 1
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}
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override var pseudoLegalPositions: [Square.Position] {
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return [
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position + (1 * sign, 0),
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position + (2 * sign, 0),
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position + (1 * sign, 1),
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position + (1 * sign, -1),
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].filter { $0.index != nil }
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}
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override var unicodeRepresentation: String {
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color == .Black ? "♟" : "♙"
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}
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override func isLegal(on pos: Square.Position) -> Bool {
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#warning("Handle en-passant")
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if pos == position + (2 * sign, 0) && halfMoveCount > 0 {
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return false
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}
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if (pos == position + (1 * sign, 0) || pos == position + (2 * sign, 0))
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&& delegate?.getSquareInfo(on: pos)?.piece != nil
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{
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return false
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}
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guard super.isLegal(on: pos) else {
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return false
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}
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if (pos == position + (1 * sign, 1) || pos == position + (1 * sign, -1))
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&& delegate?.getSquareInfo(on: pos)?.piece == nil
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{
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return false
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}
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return true
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}
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init(with color: Color, on position: Square.Position) {
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super.init(kind: .Pawn, on: position, with: color)
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}
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}
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