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move.nim
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import
types,
bitboard,
utils
type Move* = distinct uint32
# source: [0..6], target: [7..13], moved: [14..16], captured: [17..19], promoted: [20..22],
# castled: 23, capturedEnPassant: 24, enPassantTarget: [25..31]
func `==`*(a,b: Move): bool =
cast[uint32](a) == cast[uint32](b)
template create*(
move: var Move,
source, target, enPassantTarget: Square,
moved, captured, promoted: Piece,
castled, capturedEnPassant: bool
) =
move = cast[Move](0u32)
move = cast[Move](cast[uint32](move) or (source.uint32 and 0b1111111))
move = cast[Move](cast[uint32](move) or ((target.uint32 and 0b1111111) shl 7))
move = cast[Move](cast[uint32](move) or ((moved.uint32 and 0b111) shl 14))
move = cast[Move](cast[uint32](move) or ((captured.uint32 and 0b111) shl 17))
move = cast[Move](cast[uint32](move) or ((promoted.uint32 and 0b111) shl 20))
move = cast[Move](cast[uint32](move) or ((castled.uint32 and 0b1) shl 23))
move = cast[Move](cast[uint32](move) or ((capturedEnPassant.uint32 and 0b1) shl 24))
move = cast[Move](cast[uint32](move) or ((enPassantTarget.uint32 and 0b1111111) shl 25))
template source*(move: Move): Square =
(cast[uint32](move) and 0b1111111).Square
template target*(move: Move): Square =
((cast[uint32](move) shr 7) and 0b1111111).Square
template moved*(move: Move): Piece =
((cast[uint32](move) shr 14) and 0b111).Piece
template captured*(move: Move): Piece =
((cast[uint32](move) shr 17) and 0b111).Piece
template promoted*(move: Move): Piece =
((cast[uint32](move) shr 20) and 0b111).Piece
template castled*(move: Move): bool =
((cast[uint32](move) shr 23) and 0b1).bool
template capturedEnPassant*(move: Move): bool =
((cast[uint32](move) shr 24) and 0b1).bool
template enPassantTarget*(move: Move): Square =
((cast[uint32](move) shr 25) and 0b1111111).Square
const noMove*: Move = block:
var move: Move
move.create(noSquare, noSquare, noSquare, noPiece, noPiece, noPiece, false, false)
move
static: doAssert noMove.source == noSquare
static: doAssert noMove.target == noSquare
static: doAssert noMove.moved == noPiece
static: doAssert noMove.captured == noPiece
static: doAssert noMove.promoted == noPiece
static: doAssert noMove.castled == false
static: doAssert noMove.capturedEnPassant == false
static: doAssert noMove.enPassantTarget == noSquare
template isCapture*(move: Move): bool =
move.captured != noPiece
template isPromotion*(move: Move): bool =
move.promoted != noPiece
template isTactical*(move: Move): bool =
move.isCapture or move.isPromotion
template isPawnMoveToSecondRank*(move: Move): bool =
(move.moved == pawn and (move.target.toBitboard and (ranks[a2] or ranks[a7])) != 0)
func `$`*(move: Move): string =
result = $move.source & $move.target
if move.promoted != noPiece:
result &= move.promoted.notation