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157 lines
2.1 KiB
157 lines
2.1 KiB
4 years ago
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package chess
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const (
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numOfSquaresInBoard = 64
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numOfSquaresInRow = 8
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)
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// A Square is one of the 64 rank and file combinations that make up a chess board.
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type Square int8
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// File returns the square's file.
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func (sq Square) File() File {
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return File(int(sq) % numOfSquaresInRow)
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}
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// Rank returns the square's rank.
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func (sq Square) Rank() Rank {
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return Rank(int(sq) / numOfSquaresInRow)
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}
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func (sq Square) String() string {
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return sq.File().String() + sq.Rank().String()
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}
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func (sq Square) color() Color {
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if ((sq / 8) % 2) == (sq % 2) {
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return Black
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}
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return White
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}
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func getSquare(f File, r Rank) Square {
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return Square((int(r) * 8) + int(f))
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}
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const (
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NoSquare Square = iota - 1
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A1
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B1
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C1
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D1
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E1
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F1
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G1
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H1
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A2
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B2
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C2
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D2
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E2
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F2
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G2
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H2
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A3
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B3
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C3
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D3
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E3
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F3
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G3
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H3
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A4
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B4
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C4
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D4
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E4
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F4
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G4
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H4
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A5
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B5
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C5
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D5
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E5
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F5
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G5
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H5
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A6
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B6
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C6
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D6
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E6
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F6
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G6
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H6
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A7
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B7
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C7
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D7
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E7
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F7
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G7
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H7
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A8
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B8
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C8
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D8
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E8
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F8
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G8
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H8
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)
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const (
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fileChars = "abcdefgh"
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rankChars = "12345678"
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)
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// A Rank is the rank of a square.
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type Rank int8
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const (
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Rank1 Rank = iota
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Rank2
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Rank3
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Rank4
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Rank5
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Rank6
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Rank7
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Rank8
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)
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func (r Rank) String() string {
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return rankChars[r : r+1]
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}
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// A File is the file of a square.
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type File int8
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const (
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FileA File = iota
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FileB
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FileC
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FileD
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FileE
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FileF
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FileG
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FileH
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)
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func (f File) String() string {
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return fileChars[f : f+1]
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}
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var (
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strToSquareMap = map[string]Square{
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"a1": A1, "a2": A2, "a3": A3, "a4": A4, "a5": A5, "a6": A6, "a7": A7, "a8": A8,
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"b1": B1, "b2": B2, "b3": B3, "b4": B4, "b5": B5, "b6": B6, "b7": B7, "b8": B8,
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"c1": C1, "c2": C2, "c3": C3, "c4": C4, "c5": C5, "c6": C6, "c7": C7, "c8": C8,
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"d1": D1, "d2": D2, "d3": D3, "d4": D4, "d5": D5, "d6": D6, "d7": D7, "d8": D8,
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"e1": E1, "e2": E2, "e3": E3, "e4": E4, "e5": E5, "e6": E6, "e7": E7, "e8": E8,
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"f1": F1, "f2": F2, "f3": F3, "f4": F4, "f5": F5, "f6": F6, "f7": F7, "f8": F8,
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"g1": G1, "g2": G2, "g3": G3, "g4": G4, "g5": G5, "g6": G6, "g7": G7, "g8": G8,
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"h1": H1, "h2": H2, "h3": H3, "h4": H4, "h5": H5, "h6": H6, "h7": H7, "h8": H8,
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}
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)
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