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package Plucene::Search::PhraseScorer; |
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=head1 NAME |
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Plucene::Search::PhraseScorer - a phrase scorer |
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=head1 SYNOPSIS |
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# isa Plucene::Search::Scorer |
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$scorer->score($results, $end); |
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=head1 DESCRIPTION |
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This is the phrase scorer. |
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=head1 METHODS |
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=cut |
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use strict; |
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use warnings; |
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use Tie::Array::Sorted; |
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use Plucene::Search::PhrasePositions; |
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use base qw(Plucene::Search::Scorer Class::Accessor::Fast); |
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sub _phrase_freq { die "Abstract method" } |
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__PACKAGE__->mk_accessors(qw/ norms weight pq first last /); |
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sub new { |
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my $self = shift->SUPER::new(@_); |
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my @pq; |
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tie @pq, "Tie::Array::Sorted", sub { |
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$_[0]->doc <=> $_[1]->doc |
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|| $_[0]->position <=> $_[1]->position; |
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}; |
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for my $i (0 .. $#{ $self->{tps} }) { |
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push @pq, |
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Plucene::Search::PhrasePositions->new({ |
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tp => $self->{tps}->[$i], |
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offset => $i |
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}); |
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} |
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$self->{pq} = \@pq; |
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$self->_pq_to_list(); |
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return $self; |
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} |
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# Thread the array elements together into a linked list |
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sub _pq_to_list { |
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my $self = shift; |
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$self->{first} = $self->{last} = undef; |
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while (@{ $self->{pq} }) { |
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1456
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my $pp = shift @{ $self->{pq} }; |
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# If there's an entry already, put this after it |
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if ($self->{last}) { $self->last->next_in_list($pp); } |
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# Else, this is the first one |
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else { $self->first($pp); } |
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# But it's definitely the last one |
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$self->last($pp); |
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# And there's nothing after it, yet. |
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$pp->next_in_list(undef); |
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} |
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} |
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77
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=head2 score |
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79
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$scorer->score($results, $end); |
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81
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=cut |
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83
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sub score { |
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1
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my ($self, $results, $end) = @_; |
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6
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while ($self->last->doc < $end) { |
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while ($self->first->doc < $self->last->doc) { |
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873
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do { |
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$self->first->next; |
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} while $self->first->doc < $self->last->doc; |
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1213
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$self->_first_to_last; |
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100
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return if $self->last->doc >= $end; |
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} |
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1295
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my $freq = $self->_phrase_freq; |
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$self->_score_it($freq, $self->first->doc, $results); |
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$self->last->next; |
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} |
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} |
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sub _first_to_last { |
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my $self = shift; |
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194
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$self->last->next_in_list($self->first); |
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194
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2264
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$self->last($self->first); |
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194
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1670
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$self->first($self->first->next_in_list); |
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194
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2160
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$self->last->next_in_list(undef); |
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} |
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107
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1; |