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fen to fen functions
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Steffan Westcott



Joined: 11 Mar 2006
Posts: 28
Location: Midlands, England
PostPost subject: Re: fen to fen functions    Posted: Sat Jun 02, 2007 5:05 pm Reply to topic Reply with quote
Alessandro Scotti wrote:
I think we could run an informal contest for the:
1) shortest code (but clean and elegant);
2) shortest and trickiest code (anything goes).
Anyone interested?

Here's my effort for your entertainment, 2 Perl programs for mirror and flip operations. They both handle all FEN fields, including side-to-move, en passant square and castling rights:
Code:
# mirror.pl : Prints FEN string of horizontally mirrored input position, castling rights clobbered
@_ = @ARGV;
$_[0] = reverse join '/', reverse split /\//, $_[0];
$_[2] = "-";
$_[3] =~ tr/a-h/hgfedcba/;
print join ' ', @_;

Code:
# flip.pl : Prints FEN string of vertically flipped input position, colour swapped
@_ = @ARGV;
$_[0] = join '/', reverse split /\//, $_[0];
$_[0] =~ tr/a-zA-Z/A-Za-z/;
$_[1] =~ tr/wb/bw/;
$_[2] =~ tr/KQkq/kqKQ/;
$_[2] = join '', sort split //, $_[2];
$_[3] =~ tr/36/63/;
print join ' ', @_;
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Display posts from previous:   
Subject Author Date/Time
fen to fen functions Uri Blass Mon May 21, 2007 10:17 am
      Re: fen to fen functions Alessandro Scotti Mon May 21, 2007 3:20 pm
      Re: fen to fen functions Reinhard Scharnagl Mon May 21, 2007 5:10 pm
            Re: fen to fen functions Uri Blass Tue May 22, 2007 1:21 pm
                  Re: fen to fen functions Alessandro Scotti Tue May 22, 2007 3:46 pm
                        Re: fen to fen functions Uri Blass Tue May 22, 2007 4:24 pm
                              Re: fen to fen functions Alessandro Scotti Tue May 22, 2007 4:46 pm
                                    Re: fen to fen functions Uri Blass Thu May 24, 2007 12:52 pm
                                          Re: fen to fen functions Uri Blass Thu May 24, 2007 4:51 pm
                                                Re: fen to fen functions Uri Blass Thu May 24, 2007 8:13 pm
                                    Re: fen to fen functions Steffan Westcott Sat Jun 02, 2007 5:05 pm
                              Re: fen to fen functions Dann Corbit Tue May 22, 2007 6:33 pm
      Re: fen to fen functions Dann Corbit Mon May 21, 2007 5:48 pm
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