chess-on-go/square.go at master · kjda/chess-on-go · GitHub

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package chessongo

type Square uint8

// get rank from square
func (s Square) Rank() int {
	return int(s / 8)
}

// get file from square
func (s Square) File() int {
	return int(s % 8)
}

func (s Square) FileLetter() string {
	return string(SQUARE_TO_COORDS[s][0])
}

// RankDigit returns the rank character ('1'-'8') as a string
func (s Square) RankDigit() string {
	return string(SQUARE_TO_COORDS[s][1])
}

func (s Square) Coords() string {
	return SQUARE_TO_COORDS[s]
}

var SQUARE_TO_COORDS = [64]string{
	"a8", "b8", "c8", "d8", "e8", "f8", "g8", "h8",
	"a7", "b7", "c7", "d7", "e7", "f7", "g7", "h7",
	"a6", "b6", "c6", "d6", "e6", "f6", "g6", "h6",
	"a5", "b5", "c5", "d5", "e5", "f5", "g5", "h5",
	"a4", "b4", "c4", "d4", "e4", "f4", "g4", "h4",
	"a3", "b3", "c3", "d3", "e3", "f3", "g3", "h3",
	"a2", "b2", "c2", "d2", "e2", "f2", "g2", "h2",
	"a1", "b1", "c1", "d1", "e1", "f1", "g1", "h1",
}

var COORDS_TO_SQUARE = map[string]Square{
	"a8": Square(0), "b8": Square(1), "c8": Square(2), "d8": Square(3), "e8": Square(4), "f8": Square(5), "g8": Square(6), "h8": Square(7),
	"a7": Square(8), "b7": Square(9), "c7": Square(10), "d7": Square(11), "e7": Square(12), "f7": Square(13), "g7": Square(14), "h7": Square(15),
	"a6": Square(16), "b6": Square(17), "c6": Square(18), "d6": Square(19), "e6": Square(20), "f6": Square(21), "g6": Square(22), "h6": Square(23),
	"a5": Square(24), "b5": Square(25), "c5": Square(26), "d5": Square(27), "e5": Square(28), "f5": Square(29), "g5": Square(30), "h5": Square(31),
	"a4": Square(32), "b4": Square(33), "c4": Square(34), "d4": Square(35), "e4": Square(36), "f4": Square(37), "g4": Square(38), "h4": Square(39),
	"a3": Square(40), "b3": Square(41), "c3": Square(42), "d3": Square(43), "e3": Square(44), "f3": Square(45), "g3": Square(46), "h3": Square(47),
	"a2": Square(48), "b2": Square(49), "c2": Square(50), "d2": Square(51), "e2": Square(52), "f2": Square(53), "g2": Square(54), "h2": Square(55),
	"a1": Square(56), "b1": Square(57), "c1": Square(58), "d1": Square(59), "e1": Square(60), "f1": Square(61), "g1": Square(62), "h1": Square(63),
}