/usr/share/perl5/Tie/Array/Iterable/BackwardIterator.pm is in libtie-array-iterable-perl 0.03-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | #!/usr/bin/perl -w
package Tie::Array::Iterable::BackwardIterator;
#=============================================================================
#
# $Id: BackwardIterator.pm,v 0.03 2001/11/16 02:27:58 mneylon Exp $
# $Revision: 0.03 $
# $Author: mneylon $
# $Date: 2001/11/16 02:27:58 $
# $Log: BackwardIterator.pm,v $
# Revision 0.03 2001/11/16 02:27:58 mneylon
# Fixed packing version variables
#
# Revision 0.01.01.2 2001/11/16 02:12:16 mneylon
# Added code to clean up iterators after use
# clear_iterators() now not needed, simply returns 1;
#
# Revision 0.01.01.1 2001/11/15 01:41:21 mneylon
# Branch from 0.01 for new features
#
# Revision 0.01 2001/11/11 18:36:14 mneylon
# Initial Release
#
#
#=============================================================================
use 5.006;
use strict;
my $BACKWARDID;
my %BACKWARDITERS;
BEGIN {
use Exporter ();
use vars qw($VERSION @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
( $VERSION ) = '$Revision: 0.03 $ ' =~ /\$Revision:\s+([^\s]+)/;
@ISA = qw( Exporter );
@EXPORT = qw( );
@EXPORT_OK = qw( );
%EXPORT_TAGS = ( );
}
sub new {
my $class = shift;
my $iterarray = shift;
my $pos = shift || scalar @$iterarray;
warn "Must be created from a Tie::Array::Iterable"
unless ( UNIVERSAL::isa( $iterarray, "Tie::Array::Iterable" ) );
my %data = (
array => $iterarray,
pos => $pos,
id => ++$BACKWARDID );
$BACKWARDITERS{ $data{ id } } = \%data;
return bless \%data, $class;
}
sub DESTORY {
my $self = shift;
$self->{ array }->_remove_backward_iterator( $self->{ id } );
}
sub at_start {
my $self = shift;
if ( $self->{ pos } >= scalar @{ $self->{ array } } ) {
return 1;
} else {
return 0;
}
}
sub at_end {
my $self = shift;
if ( $self->{ pos } <= 0 ) {
return 1;
} else {
return 0;
}
}
sub to_start {
my $self = shift;
$self->{ pos } = scalar @{ $self->{ array } };
}
sub to_end {
my $self = shift;
$self->{ pos } = 0;
}
sub value {
my $self = shift;
if ( $self->at_end() ) { return undef };
return $self->{ array }->[ $self->{ pos } - 1 ];
}
sub set_value {
my $self = shift;
my $value = shift;
if ( $self->at_end() ) { return undef; };
return ( $self->{ array }->[ $self->{ pos } - 1 ] = $value );
}
sub index {
my $self = shift;
return $self->{ pos };
}
sub set_index {
my $self = shift;
my $index = shift();
if ( $index < 0 ) { $index = 1; }
if ( $index > scalar @{ $self->{ array } } )
{ $index = scalar @{ $self->{ array } }; }
$self->{ pos } = $index;
}
sub next {
my $self = shift;
if ( $self->at_end() ) {
return undef;
}
$self->{ pos }--;
return $self->value();
}
sub prev {
my $self = shift;
if ( $self->at_start() ) {
return undef;
}
$self->{ pos }++;
return $self->value();
}
sub forward {
my $self = shift;
my $steps = shift;
die "Number of steps must be non-negative" if $steps < 0;
$steps = 1 if ( !$steps && $steps ne "0" );
my $value = $self->value();
$value = $self->next() for ( 1..$steps );
return $value;
}
sub backward {
my $self = shift;
my $steps = shift;
die "Number of steps must be non-negative" if $steps < 0;
$steps = 1 if ( !$steps && $steps ne "0" );
my $value = $self->value();
$value = $self->prev() for ( 1..$steps );
return $value;
}
sub _lookup ($) {
return $BACKWARDITERS{ +shift };
}
sub _id {
my $self = shift;
return $self->{ id };
}
1;
__END__
=pod
=head1 NAME
Tie::Array::Iterable::ForwardIterator - Forward Iterator object
=head1 DESCRIPTION
Please see the L<Tie::Array::Iterable> documentation for full usage.
=head1 AUTHOR
Michael K. Neylon E<lt>mneylon-pm@masemware.comE<gt>
=head1 COPYRIGHT
Copyright 2001 by Michael K. Neylon E<lt>mneylon-pm@masemware.comE<gt>.
This program is free software; you can redistribute it
and/or modify it under the same terms as Perl itself.
See http://www.perl.com/perl/misc/Artistic.html
=cut
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