Re: [Moscow.pm] Постраничный вывод (Pagination)

Mon, 23 Apr 2012 09:27:12 -0700

oleg alexeenkov <[email protected]> писал(а) в своём письме Mon, 23 Apr 2012 19:11:11 +0300:
Alessandro Gorohovski <[email protected]> писал(а) в своём письме Mon, 23 Apr 2012 19:58:41 +0400: 


Andrew Shitov <[email protected]> писал(а) в своём письме Mon, 23 Apr 2012  
18:49:39 +0300:



http://search.cpan.org/search?query=pagination&mode=all
?




Олег,
 Спасибо большое!
:)

Любопытный код. Буду ковыряться.





[вброс] давным давно наковырял такую штуку, работает с миллиардами  
страниц 8) причем скорее всего путь перехода со страницы X на страницу Y  
будет наименьшим среди аналогов (особенно если подкрутить параметры)


sub gotopage {
   my ($fparam) = @_;
   my (%ret);
   #$fparam->{'total'} : total results, usually COUNT(*) as total
   #-----------size -- : size of one page in rows (LIMIT x,size)
   #current : current page number
   #actual : usually $DBI::rows, if total unknown
   #last : last page number (auto calculated from total/size if 0)
   #total_max = 1000 : maximum db results
   #printlog('dmp', 'gotopage start:', Dumper($fparam));
   $fparam->{'size'} = 100 unless defined $fparam->{'size'};
   return {} unless $fparam->{'size'};

   $fparam->{'actual'} = $fparam->{'size'} unless defined  
$fparam->{'actual'};

   $fparam->{'current'} ||= 1;
   $fparam->{'last'} ||=
     $fparam->{'size'} < 1
     ? undef

     : ( int( $fparam->{'total'} / ( $fparam->{'size'} || 1 ) ) + (  
$fparam->{'total'} % ( $fparam->{'size'} || 1 ) ? 1 : 0 ) );

   $fparam->{'buttonsb'} ||= $config{'gotopage_bb'} || 5;    #before
   $fparam->{'buttonsa'} ||= $config{'gotopage_ba'} || 5;    #after
   $fparam->{'align'}   = 1 unless defined $fparam->{'align'};
   $fparam->{'jumpten'} = 1 unless defined $fparam->{'jumpten'};
   $fparam->{'power'}   = 2 unless defined $fparam->{'power'};
   my $fromto = sub {
     my ($n) = @_;
     return (
       ( ( ( $n - 1 ) * $fparam->{'size'} ) + 1 ) . '-'
         . (

         ( $fparam->{'total'} and ( $fparam->{'total'} < $n *  
$fparam->{'size'} ) ) ? $fparam->{'total'} : $n * $fparam->{'size'}

         )
     );
   };
   my $align = sub {
     my $a = int(shift);
     my $len = shift || $fparam->{'align'};

     substr( $a, $len, length($a) - $len ) = '0' x ( length($a) - $len )  
if $len > 0 and length($a) > $len;

     return $a;
   };

   #printlog('dmp', 'gotopage calc:'," <br\n/>" .Dumper($fparam) .  
"<br\n/>");

   my $next = $fparam->{'actual'} >= $fparam->{'size'};
   if ( ( !$fparam->{'total'} and $fparam->{'actual'} > 0 )
     or $fparam->{'total'} >= $fparam->{'size'}
     or $fparam->{'current'} > 1 )
   {

     $ret{'prev'}{ $fparam->{'current'} - 1 } = $fromto->(  
$fparam->{'current'} - 1 ) if $fparam->{'current'} > 1;
     for my $n ( ( $fparam->{'current'} > $fparam->{'buttonsb'} ?  
$fparam->{'current'} - $fparam->{'buttonsb'} : 2 )

       .. $fparam->{'current'} + ( $next ? $fparam->{'buttonsa'} : 0 ) )
     {
       last if $fparam->{'total'} and $n > $fparam->{'last'};

       last if $fparam->{'total_max'} and $n * $fparam->{'size'} >  
$fparam->{'total_max'};
       ( ( !$fparam->{'total'} and $n > $fparam->{'current'} + 1 ) ? (  
\%{ $ret{'small'} } ) : ( \%{ $ret{'big'} } ) )->{$n} =

         $fromto->($n);
     }
     if ( $fparam->{'jumpten'} ) {

       $fparam->{'jumpfrom'} ||= '1' . ( 0 x ( length(  
$fparam->{'current'} - $fparam->{'buttonsb'} ) - 1 ) );
       $fparam->{'jumpto'} ||= '1' . ( 0 x length( $fparam->{'current'}  
+ $fparam->{'buttonsa'} ) );

       $ret{'big'}{$_} = $fromto->($_)
         for grep { !$fparam->{'last'} or $_ <= $fparam->{'last'} }

         map { '1' . ( 0 x $_ ) } 1 .. length( $fparam->{'current'} ) -  
1;

       if ($next) {
         $ret{'big'}{$_} = $fromto->($_)

           for map { '1' . ( 0 x $_ ) } length( $fparam->{'current'} )  
.. length( $fparam->{'last'} ) - 1;

       }
     }
     $fparam->{'jumpfrom'} ||= 1;
     $fparam->{'jumpto'}   ||= $fparam->{'last'};

     #$fparam->{'jumpto'} = psmisc::min( $fparam->{'jumpto'},  
$fparam->{'last'} );
     $fparam->{'jumpto'} = $fparam->{'last'} if $fparam->{'last'} <  
$fparam->{'jumpto'};

     if ( $fparam->{'power'} > 1 ) {
       my ($n);

       $n = $fparam->{'current'} - $fparam->{'buttonsb'} *  
$fparam->{'power'};

       for (
         $_ = $fparam->{'buttonsb'} ;

         $fparam->{'jumpfrom'} >= 1 and $n > $fparam->{'jumpfrom'} and  
$n < $fparam->{'last'} ;

         $n -= ( $_ *= $fparam->{'power'} )
         )
       {
         $ret{'big'}{ $align->($n) } = $fromto->( $align->($n) );
       }

       $n = $fparam->{'current'} + $fparam->{'buttonsa'} *  
$fparam->{'power'};
       for ( $_ = $fparam->{'buttonsa'} ; $next and $n <  
$fparam->{'jumpto'} ; $n += ( $_ *= $fparam->{'power'} ) ) {

         $ret{'big'}{ $align->($n) } = $fromto->( $align->($n) );
       }
     }

     $ret{'big'}{ $fparam->{'last'} } = $fromto->( $fparam->{'last'} )  
if $fparam->{'last'} > 1 and $next;

     $ret{'big'}{1} ||= $fromto->(1)
       if ( $fparam->{'last'} > 1 or !$fparam->{'total'} )
       and $fparam->{'actual'} >= $fparam->{'size'};

     $ret{'next'}{ $fparam->{'current'} + 1 } = $fromto->(  
$fparam->{'current'} + 1 )

       if $next and !$fparam->{'last'}
         or $fparam->{'current'} < $fparam->{'last'};
   }
   #printlog('dmp', 'gotopage ret:', Dumper(\%ret));

   return wantarray ? ( sort { $a <=> $b } keys %{ $ret{'big'} }, keys  
%{ $ret{'small'} } ) : \%ret;

}

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