module Egd::Procedures
Public Instance Methods
fen_index_to_square(index)
click to toggle source
Egd::Procedures.fen_index_to_square(index)
# File lib/egd/procedures.rb, line 31 def fen_index_to_square(index) # 3 -> c8 row = Egd::COLUMN_HEIGHT - ((index - 1) / Egd::COLUMN_HEIGHT) # => 8 column_index = index - ((Egd::COLUMN_HEIGHT - row) * Egd::ROW_LENGTH) column = Egd::FenToBoard::LETTER_VALUES[column_index] # => "c" "#{column}#{row}" end
parse_fen(fen)
click to toggle source
Egd::Procedures.parse_fen(fen)
# File lib/egd/procedures.rb, line 8 def parse_fen(fen) match = fen.split(%r'\s+') # FEN lines are delimited with whitespace, splitting on that { board: match[0], to_move: match[1], castling: match[2], ep_square: match[3], halfmove: match[4], fullmove: match[5] } end
square_color(square)
click to toggle source
Egd::Procedures.square_color
(“a7”)
# File lib/egd/procedures.rb, line 43 def square_color(square) column = square[0] #=> a row = square[1] #=> 8 if %w|a c e g|.include?(column) row.to_i.even? ? "w" : "b" else row.to_i.odd? ? "w" : "b" end end
square_to_fen_index(square)
click to toggle source
Egd::Procedures.square_to_fen_index
(“b2”)
# File lib/egd/procedures.rb, line 22 def square_to_fen_index(square) column = square[0] row = square[1] row_value = Egd::COLUMN_HEIGHT - row.to_i row_value * Egd::ROW_LENGTH + Egd::FenToBoard::LETTER_VALUES.index(column) end