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# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
use strict;
use warnings;
package FlatQueryParser;
use base qw( Lucy::Search::QueryParser );
use Lucy::Search::TermQuery;
use Lucy::Search::PhraseQuery;
use Lucy::Search::ORQuery;
use PrefixQuery;
use Carp;
our $VERSION = '0.003003';
$VERSION = eval $VERSION;
# Inherit new()
sub parse {
my ( $self, $query_string ) = @_;
my $tokens = $self->_tokenize($query_string);
my $or_query = Lucy::Search::ORQuery->new;
for my $token (@$tokens) {
my $leaf_query = Lucy::Search::LeafQuery->new( text => $token );
$or_query->add_child($leaf_query);
}
return $self->expand($or_query);
}
sub _tokenize {
my ( $self, $query_string ) = @_;
my @tokens;
while ( length $query_string ) {
if ( $query_string =~ s/^\s+// ) {
next; # skip whitespace
}
elsif ( $query_string =~ s/^("[^"]*(?:"|$))// ) {
push @tokens, $1; # double-quoted phrase
}
else {
$query_string =~ s/(\S+)//;
push @tokens, $1; # single word
}
}
return \@tokens;
}
sub expand_leaf {
my ( $self, $leaf_query ) = @_;
my $text = $leaf_query->get_text;
if ( $text =~ /\*$/ ) {
my $or_query = Lucy::Search::ORQuery->new;
for my $field ( @{ $self->get_fields } ) {
my $prefix_query = PrefixQuery->new(
field => $field,
query_string => $text,
);
$or_query->add_child($prefix_query);
}
return $or_query;
}
else {
return $self->SUPER::expand_leaf($leaf_query);
}
}
1;
__END__
=head1 NAME
FlatQueryParser - Simple query parser, with no boolean operators.
=head1 SYNOPSIS
my $searcher = Lucy::Search::IndexSearcher->new(
index => '/path/to/index'
);
my $parser = FlatQueryParser->new( $searcher->get_schema );
my $query = $parser->parse($query_string);
my $hits = $searcher->hits( query => $query );
...
=head1 DESCRIPTION
See L<Lucy::Docs::Cookbook::CustomQueryParser>.
=cut
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