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package Petal::Utils::Limitr; |
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use strict; |
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use warnings::register; |
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use Carp; |
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use base qw( Petal::Utils::Base ); |
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use constant name => 'limitr'; |
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use constant aliases => qw(); |
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our $VERSION = ((require Petal::Utils), $Petal::Utils::VERSION)[1]; |
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our $REVISION = (split(/ /, ' $Revision: 1.2 $ '))[2]; |
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sub process { |
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my $class = shift; |
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my $hash = shift; |
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my $args = shift || confess( "'limitr' expects 2 variables (got nothing)!" ); |
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my @args = $class->split_args( $args ); |
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my $key = $args[0] || confess( "1st arg to 'limit' should be an array (got nothing)!" ); |
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my $count = $args[1] || confess( "2nd arg to 'limit' should be a variable (got nothing)!" ); |
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my $arrayref = $hash->fetch($key); |
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# Shuffle full array |
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fisher_yates_shuffle($arrayref); |
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$count--; |
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# trim $count to max size of array |
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$count = $#$arrayref if $#$arrayref < $count; |
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return [] if $count < 0; |
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return [@{$arrayref}[0 .. $count]]; |
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} |
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# Generate a random permutation of @array in place |
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# Usage: fisher_yates_shuffle( \@array ) : |
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sub fisher_yates_shuffle { |
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my $array = shift; |
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2
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return unless $#$array >= 0; |
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2
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my $i; |
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2
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for ($i = @$array; --$i; ) { |
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my $j = int rand ($i+1); |
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100
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next if $i == $j; |
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@$array[$i,$j] = @$array[$j,$i]; |
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} |
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} |
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1; |
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53
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__END__ |