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# This file is part of Language-Befunge |
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# |
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# This software is copyright (c) 2003 by Jerome Quelin. |
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# |
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# This is free software; you can redistribute it and/or modify it under |
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# the same terms as the Perl 5 programming language system itself. |
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# |
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use strict; |
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use warnings; |
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package Language::Befunge::Wrapping::LaheySpace; |
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# ABSTRACT: a LaheySpace wrapping |
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$Language::Befunge::Wrapping::LaheySpace::VERSION = '5.000'; |
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use base qw{ Language::Befunge::Wrapping }; |
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# -- PUBLIC METHODS |
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# $wrapping->wrap( $storage, $ip ); |
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# |
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# Wrap $ip in $storage according to this module wrapping algorithm. Note |
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# that $ip is already out of bounds, ie, it has been moved once by LBI. |
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# As a side effect, $ip will have its position changed. |
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# |
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# LBW::LaheySpace implements a wrapping as defined in befunge specs - |
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# ie, when hitting a bound of the storage, the ip reverses and |
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# backtraces until it bumps into another bound, and then it reverses one |
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# last time to keep its velocity. |
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# |
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sub wrap { |
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my ($self, $storage, $ip) = @_; |
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# fetch the current position/velocity of the ip. |
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my $v = $ip->get_position; |
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my $d = $ip->get_delta; |
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# fetch the storage min / max |
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my $min = $storage->min; |
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my $max = $storage->max; |
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# funge98 says we should walk our current trajectory in reverse, |
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# until we hit the other side of the storage, and then continue |
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# along the same path. |
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do { |
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4851
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$v -= $d; |
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} while ( $v->bounds_check($min, $max) ); |
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# now that we've hit the wall, walk back into the valid code range. |
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$v += $d; |
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# store new position. |
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$ip->set_position($v); |
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} |
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1; |
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__END__ |