mirror of
https://github.com/SleepingInsomniac/lx_chess_cr
synced 2025-02-12 08:47:55 +01:00
d7623482fd
moves that specify the b column get confused with the symbol for a bishop. More regex magic required for case insensitivity
56 lines
931 B
Crystal
56 lines
931 B
Crystal
module LxChess
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class Piece
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NAMES = ["Pawn", "King", "Queen", "Rook", "Bishop", "Knight"]
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SYMBOLS = "♙♔♕♖♗♘--♟♚♛♜♝♞"
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FEN_SYMBOLS = "PKQRBN--pkqrbn"
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PAWN = 0
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KING = 1
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QUEEN = 2
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ROOK = 3
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BISHOP = 4
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KNIGHT = 5
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def self.from_fen(fen : Char)
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id = FEN_SYMBOLS.index(fen).as(Int32).to_i8
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Piece.new(id)
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end
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property index : (Nil | Int16)
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def initialize(@id : Int8 = 0)
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end
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def white?
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@id & 0b1000 == 0
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end
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def black?
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@id & 0b1000 == 0b1000
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end
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def color
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white? ? :white : :black
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end
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def name
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NAMES[@id & 0b1000]
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end
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def symbol(force_black = false)
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if force_black
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SYMBOLS[@id | 0b1000]
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else
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SYMBOLS[@id]
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end
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end
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def fen_symbol
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FEN_SYMBOLS[@id]
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end
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def pawn?
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@id & 0b0111 == PAWN
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end
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end
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end
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