1 package Koha::SearchEngine::Elasticsearch::QueryBuilder;
3 # This file is part of Koha.
5 # Copyright 2014 Catalyst IT Ltd.
7 # Koha is free software; you can redistribute it and/or modify it
8 # under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # Koha is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
22 Koha::SearchEngine::Elasticsearch::QueryBuilder - constructs elasticsearch
23 query objects from user-supplied queries
27 This provides the functions that take a user-supplied search query, and
28 provides something that can be given to elasticsearch to get answers.
32 use Koha::SearchEngine::Elasticsearch::QueryBuilder;
33 $builder = Koha::SearchEngine::Elasticsearch->new({ index => $index });
34 my $simple_query = $builder->build_query("hello");
35 # This is currently undocumented because the original code is undocumented
36 my $adv_query = $builder->build_advanced_query($indexes, $operands, $operators);
42 use base qw(Koha::SearchEngine::Elasticsearch);
45 use List::MoreUtils qw/ each_array /;
54 my $simple_query = $builder->build_query("hello", %options)
56 This will build a query that can be issued to elasticsearch from the provided
57 string input. This expects a lucene style search form (see
58 L<http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/query-dsl-query-string-query.html#query-string-syntax>
61 It'll make an attempt to respect the various query options.
63 Additional options can be provided with the C<%options> hash.
69 This should be an arrayref of hashrefs, each containing a C<field> and an
70 C<direction> (optional, defaults to C<asc>.) The results will be sorted
71 according to these values. Valid values for C<direction> are 'asc' and 'desc'.
78 my ( $self, $query, %options ) = @_;
80 my $stemming = C4::Context->preference("QueryStemming") || 0;
81 my $auto_truncation = C4::Context->preference("QueryAutoTruncate") || 0;
82 my $weight_fields = C4::Context->preference("QueryWeightFields") || 0;
83 my $fuzzy_enabled = C4::Context->preference("QueryFuzzy") || 0;
85 $query = '*' unless defined $query;
91 fuzziness => $fuzzy_enabled ? 'auto' : '0',
92 default_operator => 'AND',
93 default_field => '_all',
94 lenient => JSON::true,
95 analyze_wildcard => JSON::true,
96 fields => $options{fields} || [],
100 if ( $options{sort} ) {
101 foreach my $sort ( @{ $options{sort} } ) {
102 my ( $f, $d ) = @$sort{qw/ field direction /};
103 die "Invalid sort direction, $d"
104 if $d && ( $d ne 'asc' && $d ne 'desc' );
105 $d = 'asc' unless $d;
107 $f = $self->_sort_field($f);
108 push @{ $res->{sort} }, { $f => { order => $d } };
112 # See _convert_facets in Search.pm for how these get turned into
113 # things that Koha can use.
114 my $size = C4::Context->preference('FacetMaxCount');
115 $res->{aggregations} = {
116 author => { terms => { field => "author__facet" , size => $size } },
117 subject => { terms => { field => "subject__facet", size => $size } },
118 itype => { terms => { field => "itype__facet", size => $size} },
119 location => { terms => { field => "location__facet", size => $size } },
120 'su-geo' => { terms => { field => "su-geo__facet", size => $size} },
121 'title-series' => { terms => { field => "title-series__facet", size => $size } },
122 ccode => { terms => { field => "ccode__facet", size => $size } },
123 ln => { terms => { field => "ln__facet", size => $size } },
126 my $display_library_facets = C4::Context->preference('DisplayLibraryFacets');
127 if ( $display_library_facets eq 'both'
128 or $display_library_facets eq 'home' ) {
129 $res->{aggregations}{homebranch} = { terms => { field => "homebranch__facet" } };
131 if ( $display_library_facets eq 'both'
132 or $display_library_facets eq 'holding' ) {
133 $res->{aggregations}{holdingbranch} = { terms => { field => "holdingbranch__facet" } };
138 =head2 build_browse_query
140 my $browse_query = $builder->build_browse_query($field, $query);
142 This performs a "starts with" style query on a particular field. The field
143 to be searched must have been indexed with an appropriate mapping as a
144 "phrase" subfield, which pretty much everything has.
148 # XXX this isn't really a browse query like we want in the end
149 sub build_browse_query {
150 my ( $self, $field, $query ) = @_;
152 my $fuzzy_enabled = C4::Context->preference("QueryFuzzy") || 0;
154 return { query => '*' } if !defined $query;
156 # TODO this should come from Koha::SearchEngine::Elasticsearch
157 my %field_whitelist = (
161 $field = 'title' if !exists $field_whitelist{$field};
162 my $sort = $self->_sort_field($field);
165 match_phrase_prefix => {
169 fuzziness => $fuzzy_enabled ? 'auto' : '0',
173 sort => [ { $sort => { order => "asc" } } ],
177 =head2 build_query_compat
180 $error, $query, $simple_query, $query_cgi,
181 $query_desc, $limit, $limit_cgi, $limit_desc,
182 $stopwords_removed, $query_type
184 = $builder->build_query_compat( \@operators, \@operands, \@indexes,
185 \@limits, \@sort_by, $scan, $lang );
187 This handles a search using the same api as L<C4::Search::buildQuery> does.
189 A very simple query will go in with C<$operands> set to ['query'], and
190 C<$sort_by> set to ['pubdate_dsc']. This simple case will return with
191 C<$query> set to something that can perform the search, C<$simple_query>
192 set to just the search term, C<$query_cgi> set to something that can
193 reproduce this search, and C<$query_desc> set to something else.
197 sub build_query_compat {
198 my ( $self, $operators, $operands, $indexes, $orig_limits, $sort_by, $scan,
202 #die Dumper ( $self, $operators, $operands, $indexes, $orig_limits, $sort_by, $scan, $lang );
203 my @sort_params = $self->_convert_sort_fields(@$sort_by);
204 my @index_params = $self->_convert_index_fields(@$indexes);
205 my $limits = $self->_fix_limit_special_cases($orig_limits);
206 if ( $params->{suppress} ) { push @$limits, "suppress:0"; }
208 # Merge the indexes in with the search terms and the operands so that
209 # each search thing is a handy unit.
210 unshift @$operators, undef; # The first one can't have an op
212 my $truncate = C4::Context->preference("QueryAutoTruncate") || 0;
213 my $ea = each_array( @$operands, @$operators, @index_params );
214 while ( my ( $oand, $otor, $index ) = $ea->() ) {
215 next if ( !defined($oand) || $oand eq '' );
216 $oand = $self->_clean_search_term($oand);
217 $oand = $self->_truncate_terms($oand) if ($truncate);
218 push @search_params, {
219 operand => $oand, # the search terms
220 operator => defined($otor) ? uc $otor : undef, # AND and so on
221 $index ? %$index : (),
225 # We build a string query from limits and the queries. An alternative
226 # would be to pass them separately into build_query and let it build
227 # them into a structured ES query itself. Maybe later, though that'd be
229 my $search_param_query_str = join( ' ', $self->_create_query_string(@search_params) );
230 my $query_str = join( ' AND ',
231 $search_param_query_str || (),
232 $self->_join_queries( $self->_convert_index_strings(@$limits) ) || () );
235 if ( defined($params->{weighted_fields}) && $params->{weighted_fields} ) {
236 push @fields, sprintf("%s^%s", $_->name, $_->weight) for Koha::SearchFields->weighted_fields;
239 # If there's no query on the left, let's remove the junk left behind
240 $query_str =~ s/^ AND //;
242 $options{fields} = \@fields;
243 $options{sort} = \@sort_params;
244 my $query = $self->build_query( $query_str, %options );
246 # We roughly emulate the CGI parameters of the zebra query builder
248 shift @$operators; # Shift out the one we unshifted before
249 $ea = each_array( @$operands, @$operators, @$indexes );
250 while ( my ( $oand, $otor, $index ) = $ea->() ) {
251 $query_cgi .= '&' if $query_cgi;
252 $query_cgi .= 'idx=' . uri_escape_utf8( $index // '') . '&q=' . uri_escape_utf8( $oand );
253 $query_cgi .= '&op=' . uri_escape_utf8( $otor ) if $otor;
255 $query_cgi .= '&scan=1' if ( $scan );
258 $simple_query = $operands->[0] if @$operands == 1;
260 if ( $simple_query ) {
261 $query_desc = $simple_query;
263 $query_desc = $search_param_query_str;
265 my $limit = $self->_join_queries( $self->_convert_index_strings(@$limits));
266 my $limit_cgi = ( $orig_limits and @$orig_limits )
267 ? '&limit=' . join( '&limit=', map { uri_escape_utf8($_) } @$orig_limits )
270 $limit_desc = "$limit" if $limit;
273 undef, $query, $simple_query, $query_cgi, $query_desc,
274 $limit, $limit_cgi, $limit_desc, undef, undef
278 =head2 build_authorities_query
280 my $query = $builder->build_authorities_query(\%search);
282 This takes a nice description of an authority search and turns it into a black-box
283 query that can then be passed to the appropriate searcher.
285 The search description is a hashref that looks something like:
290 where => 'Heading', # search the main entry
291 operator => 'exact', # require an exact match
292 value => 'frogs', # the search string
295 where => '', # search all entries
296 operator => '', # default keyword, right truncation
304 authtypecode => 'TOPIC_TERM',
309 sub build_authorities_query {
310 my ( $self, $search ) = @_;
312 # Start by making the query parts
315 foreach my $s ( @{ $search->{searches} } ) {
316 my ( $wh, $op, $val ) = @{$s}{qw(where operator value)};
317 $wh = '_all' if $wh eq '';
318 if ( $op eq 'is' || $op eq '=' || $op eq 'exact' ) {
320 # look for something that matches a term completely
321 # note, '=' is about numerical vals. May need special handling.
322 # Also, we lowercase our search because the ES
323 # index lowercases its values, and term searches don't get the
324 # search analyzer applied to them.
325 push @query_parts, { match_phrase => {"$wh.phrase" => lc $val} };
327 elsif ( $op eq 'start' ) {
328 # startswith search, uses lowercase untokenized version of heading
329 push @query_parts, { match_phrase_prefix => {"$wh.phrase" => lc $val} };
332 # regular wordlist stuff
333 my @tokens = $self->_split_query( $val );
334 foreach my $token ( @tokens ) {
335 $token = $self->_truncate_terms(
336 $self->_clean_search_term( $token )
339 my $query = $self->_join_queries( @tokens );
340 push @query_parts, { query_string => { default_field => $wh, query => $query } };
344 # Merge the query parts appropriately
345 # 'should' behaves like 'or'
346 # 'must' behaves like 'and'
347 # Zebra results seem to match must so using that here
348 my $query = { query =>
350 { must => \@query_parts }
355 if ( exists $search->{sort} ) {
356 foreach my $k ( keys %{ $search->{sort} } ) {
357 my $f = $self->_sort_field($k);
358 $s{$f} = $search->{sort}{$k};
360 $search->{sort} = \%s;
364 $query->{sort} = [ $search->{sort} ] if exists $search->{sort};
370 =head2 build_authorities_query_compat
373 $builder->build_authorities_query_compat( \@marclist, \@and_or,
374 \@excluding, \@operator, \@value, $authtypecode, $orderby );
376 This builds a query for searching for authorities, in the style of
377 L<C4::AuthoritiesMarc::SearchAuthorities>.
385 An arrayref containing where the particular term should be searched for.
386 Options are: mainmainentry, mainentry, match, match-heading, see-from, and
387 thesaurus. If left blank, any field is used.
391 Totally ignored. It is never used in L<C4::AuthoritiesMarc::SearchAuthorities>.
399 What form of search to do. Options are: is (phrase, no truncation, whole field
400 must match), = (number exact match), exact (phrase, no truncation, whole field
401 must match). If left blank, then word list, right truncated, anywhere is used.
405 The actual user-provided string value to search for.
409 The authority type code to search within. If blank, then all will be searched.
413 The order to sort the results by. Options are Relevance, HeadingAsc,
414 HeadingDsc, AuthidAsc, AuthidDsc.
418 marclist, operator, and value must be the same length, and the values at
419 index /i/ all relate to each other.
421 This returns a query, which is a black box object that can be passed to the
422 appropriate search object.
426 our $koha_to_index_name = {
427 mainmainentry => 'heading-main',
428 mainentry => 'heading',
430 'match-heading' => 'match-heading',
431 'see-from' => 'match-heading-see-from',
432 thesaurus => 'subject-heading-thesaurus',
437 sub build_authorities_query_compat {
438 my ( $self, $marclist, $and_or, $excluding, $operator, $value,
439 $authtypecode, $orderby )
442 # This turns the old-style many-options argument form into a more
443 # extensible hash form that is understood by L<build_authorities_query>.
446 # Convert to lower case
447 $marclist = [map(lc, @{$marclist})];
448 $orderby = lc $orderby;
450 # Make sure everything exists
451 foreach my $m (@$marclist) {
452 Koha::Exceptions::WrongParameter->throw("Invalid marclist field provided: $m")
453 unless exists $koha_to_index_name->{$m};
455 for ( my $i = 0 ; $i < @$value ; $i++ ) {
456 next unless $value->[$i]; #clean empty form values, ES doesn't like undefined searches
459 where => $koha_to_index_name->{$marclist->[$i]},
460 operator => $operator->[$i],
461 value => $value->[$i],
467 ( $orderby =~ /^heading/ ) ? 'heading'
468 : ( $orderby =~ /^auth/ ) ? 'local-number'
471 my $sort_order = ( $orderby =~ /asc$/ ) ? 'asc' : 'desc';
472 %sort = ( $sort_field => $sort_order, );
475 searches => \@searches,
476 authtypecode => $authtypecode,
478 $search{sort} = \%sort if %sort;
479 my $query = $self->build_authorities_query( \%search );
483 =head2 _convert_sort_fields
485 my @sort_params = _convert_sort_fields(@sort_by)
487 Converts the zebra-style sort index information into elasticsearch-style.
489 C<@sort_by> is the same as presented to L<build_query_compat>, and it returns
490 something that can be sent to L<build_query>.
494 sub _convert_sort_fields {
495 my ( $self, @sort_by ) = @_;
497 # Turn the sorting into something we care about.
498 my %sort_field_convert = (
499 acqdate => 'date-of-acquisition',
501 call_number => 'local-classification',
502 popularity => 'issues',
503 relevance => undef, # default
505 pubdate => 'date-of-publication',
507 my %sort_order_convert =
508 ( qw( desc desc ), qw( dsc desc ), qw( asc asc ), qw( az asc ), qw( za desc ) );
510 # Convert the fields and orders, drop anything we don't know about.
511 grep { $_->{field} } map {
512 my ( $f, $d ) = /(.+)_(.+)/;
514 field => $sort_field_convert{$f},
515 direction => $sort_order_convert{$d}
520 =head2 _convert_index_fields
522 my @index_params = $self->_convert_index_fields(@indexes);
524 Converts zebra-style search index notation into elasticsearch-style.
526 C<@indexes> is an array of index names, as presented to L<build_query_compat>,
527 and it returns something that can be sent to L<build_query>.
529 B<TODO>: this will pull from the elasticsearch mappings table to figure out
534 our %index_field_convert = (
538 'lcn' => 'local-classification',
539 'callnum' => 'local-classification',
540 'record-type' => 'rtype',
541 'mc-rtype' => 'rtype',
543 'lc-card' => 'lc-card-number',
544 'sn' => 'local-number',
545 'yr' => 'date-of-publication',
546 'pubdate' => 'date-of-publication',
547 'acqdate' => 'date-of-acquisition',
548 'date/time-last-modified' => 'date-time-last-modified',
549 'dtlm' => 'date-time-last-modified',
550 'diss' => 'dissertation-information',
553 'music-number' => 'identifier-publisher-for-music',
554 'number-music-publisher' => 'identifier-publisher-for-music',
555 'music' => 'identifier-publisher-for-music',
556 'ident' => 'identifier-standard',
557 'cpn' => 'corporate-name',
558 'cfn' => 'conference-name',
559 'pn' => 'personal-name',
564 'rcn' => 'record-control-number',
566 'su-to' => 'subject',
567 #'su-geo' => 'subject',
568 'su-ut' => 'subject',
570 'se' => 'title-series',
571 'ut' => 'title-uniform',
572 'an' => 'koha-auth-number',
573 'authority-number' => 'koha-auth-number',
576 'rank' => 'relevance',
577 'phr' => 'st-phrase',
578 'wrdl' => 'st-word-list',
579 'rt' => 'right-truncation',
580 'rtrn' => 'right-truncation',
581 'ltrn' => 'left-truncation',
582 'rltrn' => 'left-and-right',
583 'mc-itemtype' => 'itemtype',
584 'mc-ccode' => 'ccode',
585 'branch' => 'homebranch',
586 'mc-loc' => 'location',
587 'stocknumber' => 'number-local-acquisition',
588 'inv' => 'number-local-acquisition',
590 'mc-itype' => 'itype',
591 'aub' => 'author-personal-bibliography',
592 'auo' => 'author-in-order',
596 'frequency-code' => 'ff8-18',
597 'illustration-code' => 'ff8-18-21',
598 'regularity-code' => 'ff8-19',
599 'type-of-serial' => 'ff8-21',
600 'format' => 'ff8-23',
601 'conference-code' => 'ff8-29',
602 'festschrift-indicator' => 'ff8-30',
603 'index-indicator' => 'ff8-31',
606 'literature-code' => 'lf',
607 'biography' => 'bio',
609 'biography-code' => 'bio',
610 'l-format' => 'ff7-01-02',
611 'lex' => 'lexile-number',
612 'hi' => 'host-item-number',
613 'itu' => 'index-term-uncontrolled',
614 'itg' => 'index-term-genre',
616 my $field_name_pattern = '[\w\-]+';
617 my $multi_field_pattern = "(?:\\.$field_name_pattern)*";
619 sub _convert_index_fields {
620 my ( $self, @indexes ) = @_;
622 my %index_type_convert =
623 ( __default => undef, phr => 'phrase', rtrn => 'right-truncate', 'st-year' => 'st-year' );
625 # Convert according to our table, drop anything that doesn't convert.
626 # If a field starts with mc- we save it as it's used (and removed) later
627 # when joining things, to indicate we make it an 'OR' join.
628 # (Sorry, this got a bit ugly after special cases were found.)
629 grep { $_->{field} } map {
630 # Lower case all field names
631 my ( $f, $t ) = map(lc, split /,/);
638 field => exists $index_field_convert{$f} ? $index_field_convert{$f} : $f,
639 type => $index_type_convert{ $t // '__default' }
641 $r->{field} = ($mc . $r->{field}) if $mc && $r->{field};
646 =head2 _convert_index_strings
648 my @searches = $self->_convert_index_strings(@searches);
650 Similar to L<_convert_index_fields>, this takes strings of the form
651 B<field:search term> and rewrites the field from zebra-style to
652 elasticsearch-style. Anything it doesn't understand is returned verbatim.
656 sub _convert_index_strings {
657 my ( $self, @searches ) = @_;
659 foreach my $s (@searches) {
661 my ( $field, $term ) = $s =~ /^\s*([\w,-]*?):(.*)/;
662 unless ( defined($field) && defined($term) ) {
666 my ($conv) = $self->_convert_index_fields($field);
667 unless ( defined($conv) ) {
671 push @res, $conv->{field} . ":"
672 . $self->_modify_string_by_type( %$conv, operand => $term );
677 =head2 _convert_index_strings_freeform
679 my $search = $self->_convert_index_strings_freeform($search);
681 This is similar to L<_convert_index_strings>, however it'll search out the
682 things to change within the string. So it can handle strings such as
683 C<(su:foo) AND (su:bar)>, converting the C<su> appropriately.
685 If there is something of the form "su,complete-subfield" or something, the
686 second part is stripped off as we can't yet handle that. Making it work
687 will have to wait for a real query parser.
691 sub _convert_index_strings_freeform {
692 my ( $self, $search ) = @_;
693 # @TODO: Currenty will alter also fields contained within quotes:
694 # `searching for "stuff cn:123"` for example will become
695 # `searching for "stuff local-number:123"
697 # Fixing this is tricky, one possibility:
698 # https://stackoverflow.com/questions/19193876/perl-regex-to-match-a-string-that-is-not-enclosed-in-quotes
699 # Still not perfect, and will not handle escaped quotes within quotes and assumes balanced quotes.
701 # Another, not so elegant, solution could be to replace all quoted content with placeholders, and put
702 # them back when processing is done.
704 # Lower case field names
705 $search =~ s/($field_name_pattern)(?:,[\w-]*)?($multi_field_pattern):/\L$1\E$2:/og;
706 # Resolve possible field aliases
707 $search =~ s/($field_name_pattern)($multi_field_pattern):/(exists $index_field_convert{$1} ? $index_field_convert{$1} : $1)."$2:"/oge;
711 =head2 _modify_string_by_type
713 my $str = $self->_modify_string_by_type(%index_field);
715 If you have a search term (operand) and a type (phrase, right-truncated), this
716 will convert the string to have the function in lucene search terms, e.g.
717 wrapping quotes around it.
721 sub _modify_string_by_type {
722 my ( $self, %idx ) = @_;
724 my $type = $idx{type} || '';
725 my $str = $idx{operand};
726 return $str unless $str; # Empty or undef, we can't use it.
728 $str .= '*' if $type eq 'right-truncate';
729 $str = '"' . $str . '"' if $type eq 'phrase';
730 if ($type eq 'st-year') {
731 if ($str =~ /^(.*)-(.*)$/) {
732 my $from = $1 || '*';
733 my $until = $2 || '*';
734 $str = "[$from TO $until]";
742 my $query_str = $self->_join_queries(@query_parts);
744 This takes a list of query parts, that might be search terms on their own, or
745 booleaned together, or specifying fields, or whatever, wraps them in
746 parentheses, and ANDs them all together. Suitable for feeding to the ES
749 Note: doesn't AND them together if they specify an index that starts with "mc"
750 as that was a special case in the original code for dealing with multiple
751 choice options (you can't search for something that has an itype of A and
752 and itype of B otherwise.)
757 my ( $self, @parts ) = @_;
759 my @norm_parts = grep { defined($_) && $_ ne '' && $_ !~ /^mc-/ } @parts;
761 map { s/^mc-//r } grep { defined($_) && $_ ne '' && $_ =~ /^mc-/ } @parts;
762 return () unless @norm_parts + @mc_parts;
763 return ( @norm_parts, @mc_parts )[0] if @norm_parts + @mc_parts == 1;
765 @mc_parts ? '(' . ( join ' OR ', map { "($_)" } @mc_parts ) . ')' : ();
767 # Handy trick: $x || () inside a join means that if $x ends up as an
768 # empty string, it gets replaced with (), which makes join ignore it.
769 # (bad effect: this'll also happen to '0', this hopefully doesn't matter
772 join( ' AND ', map { "($_)" } @norm_parts ) || (),
778 my @phrased_queries = $self->_make_phrases(@query_parts);
780 This takes the supplied queries and forces them to be phrases by wrapping
781 quotes around them. It understands field prefixes, e.g. 'subject:' and puts
782 the quotes outside of them if they're there.
787 my ( $self, @parts ) = @_;
788 map { s/^\s*(\w*?:)(.*)$/$1"$2"/r } @parts;
791 =head2 _create_query_string
793 my @query_strings = $self->_create_query_string(@queries);
795 Given a list of hashrefs, it will turn them into a lucene-style query string.
796 The hash should contain field, type (both for the indexes), operator, and
801 sub _create_query_string {
802 my ( $self, @queries ) = @_;
805 my $otor = $_->{operator} ? $_->{operator} . ' ' : '';
806 my $field = $_->{field} ? $_->{field} . ':' : '';
808 my $oand = $self->_modify_string_by_type(%$_);
809 $oand = "($oand)" if $field && scalar(split(/\s+/, $oand)) > 1 && (!defined $_->{type} || $_->{type} ne 'st-year');
810 "$otor($field$oand)";
814 =head2 _clean_search_term
816 my $term = $self->_clean_search_term($term);
818 This cleans a search term by removing any funny characters that may upset
819 ES and give us an error. It also calls L<_convert_index_strings_freeform>
820 to ensure those parts are correct.
824 sub _clean_search_term {
825 my ( $self, $term ) = @_;
827 # Lookahead for checking if we are inside quotes
828 my $lookahead = '(?=(?:[^\"]*+\"[^\"]*+\")*+[^\"]*+$)';
830 # Some hardcoded searches (like with authorities) produce things like
831 # 'an=123', when it ought to be 'an:123' for our purposes.
834 $term = $self->_convert_index_strings_freeform($term);
837 # Remove unbalanced quotes
838 my $unquoted = $term;
839 my $count = ($unquoted =~ tr/"/ /);
840 if ($count % 2 == 1) {
844 # Remove unquoted colons that have whitespace on either side of them
845 $term =~ s/(\:[:\s]+|[:\s]+:)$lookahead//g;
850 =head2 _fix_limit_special_cases
852 my $limits = $self->_fix_limit_special_cases($limits);
854 This converts any special cases that the limit specifications have into things
855 that are more readily processable by the rest of the code.
857 The argument should be an arrayref, and it'll return an arrayref.
861 sub _fix_limit_special_cases {
862 my ( $self, $limits ) = @_;
865 foreach my $l (@$limits) {
867 # This is set up by opac-search.pl
868 if ( $l =~ /^yr,st-numeric,ge=/ ) {
869 my ( $start, $end ) =
870 ( $l =~ /^yr,st-numeric,ge=(.*) and yr,st-numeric,le=(.*)$/ );
871 next unless defined($start) && defined($end);
872 push @new_lim, "copydate:[$start TO $end]";
874 elsif ( $l =~ /^yr,st-numeric=/ ) {
875 my ($date) = ( $l =~ /^yr,st-numeric=(.*)$/ );
876 next unless defined($date);
877 $date = $self->_modify_string_by_type(type => 'st-year', operand => $date);
878 push @new_lim, "copydate:$date";
880 elsif ( $l =~ /^available$/ ) {
881 push @new_lim, 'onloan:0';
892 my $field = $self->_sort_field($field);
894 Given a field name, this works out what the actual name of the field to sort
895 on should be. A '__sort' suffix is added for fields with a sort version, and
896 for text fields either '.phrase' (for sortable versions) or '.raw' is appended
897 to avoid sorting on a tokenized value.
904 my $mappings = $self->get_elasticsearch_mappings();
905 my $textField = defined $mappings->{data}{properties}{$f}{type} && $mappings->{data}{properties}{$f}{type} eq 'text';
906 if (!defined $self->sort_fields()->{$f} || $self->sort_fields()->{$f}) {
908 # We need to add '.phrase' to text fields, otherwise it'll sort
909 # based on the tokenised form.
910 $f .= '.phrase' if $textField;
912 # We need to add '.raw' to text fields without a sort field,
913 # otherwise it'll sort based on the tokenised form.
914 $f .= '.raw' if $textField;
919 =head2 _truncate_terms
921 my $query = $self->_truncate_terms($query);
923 Given a string query this function appends '*' wildcard to all terms except
924 operands and double quoted strings.
928 sub _truncate_terms {
929 my ( $self, $query ) = @_;
931 my @tokens = $self->_split_query( $query );
933 # Filter out empty tokens
934 my @words = grep { $_ !~ /^\s*$/ } @tokens;
936 # Append '*' to words if needed, ie. if it ends in a word character and is not a keyword
939 (/\W$/ or grep {lc($w) eq $_} qw/and or not/) ? $_ : "$_*";
942 return join ' ', @terms;
947 my @token = $self->_split_query($query_str);
949 Given a string query this function splits it to tokens taking into account
950 any field prefixes and quoted strings.
954 my $tokenize_split_re = qr/((?:${field_name_pattern}${multi_field_pattern}:)?"[^"]+"|\s+)/;
957 my ( $self, $query ) = @_;
959 # '"donald duck" title:"the mouse" and peter" get split into
960 # ['', '"donald duck"', '', ' ', '', 'title:"the mouse"', '', ' ', 'and', ' ', 'pete']
961 my @tokens = split $tokenize_split_re, $query;
963 # Filter out empty values
964 @tokens = grep( /\S/, @tokens );