57 lines
1.5 KiB
Swift
57 lines
1.5 KiB
Swift
internal final class Knight: Piece {
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internal weak var board: Board?
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internal var kind: Kind = .Knight
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internal var unicodeRepresentation: String {
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return color == .Black ? "♞" : "♘"
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}
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internal var color: Color
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internal var position: Square.Position
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internal var pseudoLegalPositions: [Square.Position] {
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let directions: [Square.Position] = [
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.init(file: position.file + 1, rank: position.rank + 2),
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.init(file: position.file - 1, rank: position.rank + 2),
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.init(file: position.file + 1, rank: position.rank - 2),
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.init(file: position.file - 1, rank: position.rank - 2),
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.init(file: position.file + 2, rank: position.rank + 1),
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.init(file: position.file - 2, rank: position.rank + 1),
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.init(file: position.file + 2, rank: position.rank - 1),
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.init(file: position.file - 2, rank: position.rank - 1)
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]
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return directions.filter {
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let index = $0.index
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return index < 0 || index > 63
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}
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}
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internal var legalPositions: [Square.Position] {
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return pseudoLegalPositions.filter { isLegal(on: $0) }
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}
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internal func move(to dst: Square.Position) -> Bool {
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return false
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}
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internal func isLegal(on pos: Square.Position) -> Bool {
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if let board = board, let s = board[pos] {
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if let p = s.piece {
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if p.color == color { return false }
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if p.kind == .King {
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// TODO: Notify board of check
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return false
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}
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}
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}
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return true
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}
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internal init(color: Color, on position: Square.Position) {
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self.color = color
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self.position = position
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}
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}
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