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chess_validator.py
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chess_validator.py
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""" chess_validator: validator functions for game inputs """
import utils
import chess_moves as cm
def are_coordinates_valid(col, line):
return (line in utils.LINE_NAMES) and (col in utils.COLUMN_NAMES)
def validate_move_case(input_move):
if cm.is_pawn(input_move):
return len(input_move) == 2 and input_move[1] in utils.LINE_NAMES
if (not cm.is_main_piece(input_move) )or \
not are_coordinates_valid(input_move[-2], input_move[-1]):
return False
return ( len(input_move) == 3
or
( input_move[1] in utils.COLUMN_NAMES+ utils.LINE_NAMES
and
len(input_move) == 4 )
or
( are_coordinates_valid(input_move[1], input_move[2])
and
len(input_move) == 5 )
)
def validate_eat_case(input_move):
if len(input_move) < 4 or \
input_move[-3] != 'x' or \
(not are_coordinates_valid(input_move[-2], input_move[-1])):
return False
return ( ( len(input_move) == 4
and (cm.is_pawn(input_move) or cm.is_main_piece(input_move))
)
or
( len(input_move) == 5
and ( cm.is_main_piece(input_move))
and ( input_move[1] in utils.COLUMN_NAMES + utils.LINE_NAMES )
)
or
( len(input_move) == 6
and ( cm.is_main_piece(input_move))
and ( are_coordinates_valid(input_move[1], input_move[2]) )
)
)
def is_valid_promotion(input_move, promoted_to):
return input_move[-1] in [ '1','8' ] and \
promoted_to in ['B','N','R','Q'] and \
(validate_move_case(input_move) or validate_eat_case(input_move))
def is_user_move_valid(input_move):
if len(input_move) <= 1:
print 'wrong input try again'
return False
if cm.is_check(input_move):
print "CHECK"
input_move = input_move[:-1]
if cm.is_castling(input_move):
return True
if cm.is_special_case(input_move):
return True
if not cm.is_pawn(input_move) and not cm.is_main_piece(input_move):
print 'case not valid, not a chess piece'
return False
if validate_eat_case(input_move):
print 'valid eat input'
return True
if validate_move_case(input_move):
print 'valid move input'
return True
promotion,input_move,promoted_to = cm.is_promotion(input_move)
if promotion:
if not is_valid_promotion(input_move,promoted_to):
return False
else:
return True
print 'wrong input, try again'
return False