ints.go

type scoreInt uint64

var (
	// If you think I came up with these values by hand... LOL
	//
	// Each bit in a value represents the presence or absence
	// of a score multiplier in the 8x8 upper-left corner of
	// the board.
	TWInt   = scoreInt(0x8000000000000081)
	DWInt   = scoreInt(0x100000810204000)
	TLInt   = scoreInt(0x440000000400)
	DLInt   = scoreInt(0x1022000081020010)
	NoneInt = scoreInt(0x6eddbbf76eddbb6e)
)

// ScoreAtInt uses Fanciness to return the score multiplier at x, y.
func ScoreAtInt(x, y int) ScoreType {
	// [adjustments for x or y > 7 omitted for brevity...]
  
	// Now THIS is why I studied CS!!!!!!1010110110 amirite?
	mask := scoreInt(1 << (uint(y)*8 + uint(7-x)))

	// These switch cases are ordered such that the more
	// common cases should return earlier than the less common,
	// leading to fewer checks overall.
	switch {
	case NoneInt&mask > 0:
		return None
	case DLInt&mask > 0:
		return DL
	case DWInt&mask > 0:
		return DW
	case TLInt&mask > 0:
		return TL
	case TWInt&mask > 0:
		return TW
	}

	return None // Should not happen, but 0xIDGAF
}