forked from cmitsakis/fork-notnil-chess
/
square.go
157 lines (141 loc) · 2.13 KB
/
square.go
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package chess
const (
numOfSquaresInBoard = 64
numOfSquaresInRow = 8
)
// A Square is one of the 64 rank and file combinations that make up a chess board.
type Square int8
// File returns the square's file.
func (sq Square) File() File {
return File(int(sq) % numOfSquaresInRow)
}
// Rank returns the square's rank.
func (sq Square) Rank() Rank {
return Rank(int(sq) / numOfSquaresInRow)
}
func (sq Square) String() string {
return sq.File().String() + sq.Rank().String()
}
// NewSquare creates a new Square from a File and a Rank
func NewSquare(f File, r Rank) Square {
return Square(int8(r)*numOfSquaresInRow + int8(f))
}
func (sq Square) color() Color {
if ((sq / 8) % 2) == (sq % 2) {
return Black
}
return White
}
const (
NoSquare Square = iota - 1
A1
B1
C1
D1
E1
F1
G1
H1
A2
B2
C2
D2
E2
F2
G2
H2
A3
B3
C3
D3
E3
F3
G3
H3
A4
B4
C4
D4
E4
F4
G4
H4
A5
B5
C5
D5
E5
F5
G5
H5
A6
B6
C6
D6
E6
F6
G6
H6
A7
B7
C7
D7
E7
F7
G7
H7
A8
B8
C8
D8
E8
F8
G8
H8
)
const (
fileChars = "abcdefgh"
rankChars = "12345678"
)
// A Rank is the rank of a square.
type Rank int8
const (
Rank1 Rank = iota
Rank2
Rank3
Rank4
Rank5
Rank6
Rank7
Rank8
)
func (r Rank) String() string {
return rankChars[r : r+1]
}
// A File is the file of a square.
type File int8
const (
FileA File = iota
FileB
FileC
FileD
FileE
FileF
FileG
FileH
)
func (f File) String() string {
return fileChars[f : f+1]
}
var (
strToSquareMap = map[string]Square{
"a1": A1, "a2": A2, "a3": A3, "a4": A4, "a5": A5, "a6": A6, "a7": A7, "a8": A8,
"b1": B1, "b2": B2, "b3": B3, "b4": B4, "b5": B5, "b6": B6, "b7": B7, "b8": B8,
"c1": C1, "c2": C2, "c3": C3, "c4": C4, "c5": C5, "c6": C6, "c7": C7, "c8": C8,
"d1": D1, "d2": D2, "d3": D3, "d4": D4, "d5": D5, "d6": D6, "d7": D7, "d8": D8,
"e1": E1, "e2": E2, "e3": E3, "e4": E4, "e5": E5, "e6": E6, "e7": E7, "e8": E8,
"f1": F1, "f2": F2, "f3": F3, "f4": F4, "f5": F5, "f6": F6, "f7": F7, "f8": F8,
"g1": G1, "g2": G2, "g3": G3, "g4": G4, "g5": G5, "g6": G6, "g7": G7, "g8": G8,
"h1": H1, "h2": H2, "h3": H3, "h4": H4, "h5": H5, "h6": H6, "h7": H7, "h8": H8,
}
)