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package Array::Iterator::BiDirectional; |
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74222
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use strict; |
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use warnings; |
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our $VERSION = '0.130'; # VERSION |
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1
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1
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579
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use Array::Iterator; |
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1
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387
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10
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our @ISA = qw(Array::Iterator); |
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12
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sub has_previous { |
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1
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99
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my ($self, $n) = @_; |
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15
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17
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100
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48
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if(not defined $n) { $n = 1 } |
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100
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15
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100
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1
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10
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elsif(not $n) { die "has_previous(0) doesn't make sense, did you mean current()?" } |
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1
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9
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elsif($n < 0) { die "has_previous() with negative argument doesn't make sense, did you mean has_next()?" } |
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19
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15
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34
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my $idx = $self->_current_index - $n; |
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100
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63
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return ($idx > 0) ? 1 : 0; |
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} |
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10
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10
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0
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1810
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sub hasPrevious { my $self = shift; $self->has_previous(@_) } |
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23
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25
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26
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sub previous { |
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5
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5
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1
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1752
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my ($self) = @_; |
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5
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100
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14
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(($self->_current_index - 1) > 0) |
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|| die "Out Of Bounds : no more elements"; |
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4
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10
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$self->_iterated = 1; |
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4
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9
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return $self->_getItem($self->_iteratee, --$self->_current_index); |
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} |
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sub get_previous { |
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5
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5
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1
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9
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my ($self) = @_; |
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5
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100
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14
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return undef unless (($self->_current_index - 1) > 0); |
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4
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13
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$self->_iterated = 1; |
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4
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return $self->_getItem($self->_iteratee, --$self->_current_index); |
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} |
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41
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5
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5
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0
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1932
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sub getPrevious { my $self = shift; $self->get_previous(@_) } |
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12
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42
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43
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sub look_back { |
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14
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14
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1
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90
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my ($self, $n) = @_; |
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46
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14
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100
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47
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if(not defined $n) { $n = 1 } |
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5
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100
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10
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100
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47
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1
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9
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elsif(not $n) { die "look_back(0) doesn't make sense, did you mean get_previous()?" } |
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1
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9
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elsif($n < 0) { die "look_back() with negative argument doesn't make sense, did you mean get_next()?" } |
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50
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12
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31
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my $idx = $self->_current_index - ($n + 1); |
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52
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12
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100
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41
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return undef unless ($idx > 0); |
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7
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21
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$self->_iterated = 1; |
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7
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17
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return $self->_getItem($self->_iteratee, $idx); |
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} |
56
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57
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4
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4
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0
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9
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sub lookBack { my $self = shift; $self->look_back(@_) } |
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4
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10
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58
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59
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1; |
60
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# ABSTRACT: A subclass of Array::Iterator to allow forwards and backwards iteration |
61
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62
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__END__ |