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package LXRng::Search::Xapian;
use strict;
use Search::Xapian qw/:ops :db :qpstem/;
use Search::Xapian::QueryParser;
sub new {
my ($class, $db_root) = @_;
$ENV{'XAPIAN_PREFER_FLINT'} = 1;
my $self = bless({'db_root' => $db_root,
'writes' => 0},
$class);
return $self;
}
sub wrdb {
my ($self) = @_;
return $$self{'wrdb'} ||= Search::Xapian::WritableDatabase
->new($$self{'db_root'}, Search::Xapian::DB_CREATE_OR_OPEN);
}
sub new_document {
my ($self, $desc) = @_;
my $doc = Search::Xapian::Document->new();
$doc->set_data($desc);
return $doc;
}
sub add_document {
my ($self, $doc, $rel_id) = @_;
$doc->add_term('__@@LXRREL_'.$rel_id);
my $doc_id = $self->wrdb->add_document($doc);
$self->{'writes'}++;
$self->flush() if $self->{'writes'} % 499 == 0;
return $doc_id;
}
sub add_release {
my ($self, $doc_id, $rel_id) = @_;
my $reltag = '__@@LXRREL_'.$rel_id;
my $doc = $self->wrdb->get_document($doc_id);
my $term = $doc->termlist_begin;
my $termend = $doc->termlist_end;
$term->skip_to($reltag);
if ($term ne $termend) {
return 0 if $term->get_termname eq $reltag;
}
$doc->add_term($reltag);
$self->wrdb->replace_document($doc_id, $doc);
return 1;
}
sub flush {
my ($self) = @_;
warn "\n*** hash: flushing\n";
$self->wrdb->flush();
}
sub search {
my ($self, $rel_id, $query) = @_;
my $db = Search::Xapian::Database->new($$self{'db_root'});
my $qp = new Search::Xapian::QueryParser($db);
$qp->set_stemming_strategy(STEM_NONE);
$qp->set_default_op(OP_AND);
if ($query =~ /\"/) {
# Only moderate fixup of advanced queries
$query =~ s/\b([A-Z]+)\b/\L$1\E/g;
}
else {
$query =~ s/([\S_]+_[\S_]*)/\"$1\"/g;
$query =~ s/_/ /g;
$query =~ s/\b(?![A-Z][^A-Z]*\b)(\S+)/\L$1\E/g;
}
my $query = $qp->parse_query($query);
$query = Search::Xapian::Query
->new(OP_FILTER, $query,
Search::Xapian::Query->new('__@@LXRREL_'.$rel_id));
my $enq = $db->enquire($query);
my $matches = $enq->get_mset(0, 100);
my $total = $matches->get_matches_estimated();
my $size = $matches->size();
my @res;
my $match = $matches->begin();
my $i = 0;
while ($i++ < $size) {
my $term = $enq->get_matching_terms_begin($match);
my $termend = $enq->get_matching_terms_end($match);
my %lines;
my $hits = 0;
while ($term ne $termend) {
if ($term !~ /^__\@\@LXR/) {
my $pos = $db->positionlist_begin($match->get_docid(), $term);
my $posend = $db->positionlist_end($match->get_docid(), $term);
while ($pos ne $posend) {
$lines{int($pos/100)}{$term} = 1;
$hits++;
$pos++;
}
}
$term++;
}
# Sort lines in order of the most matching terms
my %byhits;
foreach my $l (keys %lines) {
$byhits{0+keys(%{$lines{$l}})}{$l} = 1;
}
# Only consider the lines having the max number of terms
my ($max) = sort { $b <=> $a } keys %byhits;
my @lines = sort keys(%{$byhits{$max}});
push(@res, [$match->get_percent(),
$match->get_document->get_data(),
$lines[0],
0+@lines])
if @lines;
$match++;
}
return ($total, \@res);
}
sub reset_db {
my ($self) = @_;
foreach my $f (glob($$self{'db_root'}.'/*')) {
unlink($f);
}
}
sub DESTROY {
my ($self) = @_;
$self->flush() if $self->{'writes'} > 0;
}
1;
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