Text search searches in every metadata #16
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Leo Germani
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<?php
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/**
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* This class implements the default Tainacan Search engine.
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*
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* It replaces the default WordPress behavior, which is search only in the title and content of posts, and searches every item metadata.
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*
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* This is a very basic and non-performatic approach. For better results, you should try other WordPress plugins for this task. We recommend integration with Elastic Search
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*
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*
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* This class is a modification of the class found in the Search Everything plugin. All credits to the authors
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* http://wordpress.org/plugins/search-everything/
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* Author: Sovrn, zemanta
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* Author URI: http://www.sovrn.com
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*
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*/
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namespace Tainacan;
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class Search_Engine {
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var $logging = false;
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var $options;
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var $ajax_request;
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private $query_instance;
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private $taxonomies = [];
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private $is_tainacan_search = false;
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function __construct($ajax_query=false) {
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$this->ajax_request = $ajax_query ? true : false;
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$this->options = [];
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if (!defined('TAINACAN_DISABLE_DEFAULT_SEARCH_ENGINE') || TAINACAN_DISABLE_DEFAULT_SEARCH_ENGINE !== false) {
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$this->search_hooks();
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}
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}
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function search_hooks() {
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add_filter( 'posts_join', array( &$this, 'terms_join' ) );
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//add_filter( 'posts_where', array( &$this, 'search_attachments' ) );
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add_filter( 'posts_join', array( &$this, 'search_authors_join' ) );
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add_filter( 'posts_search', array( &$this, 'search_where' ), 10, 2 );
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add_filter( 'posts_request', array( &$this, 'distinct' ) );
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add_filter( 'posts_join', array( &$this, 'search_metadata_join' ) );
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//add_filter( 'posts_request', array( &$this, 'log_query' ), 10, 2 );
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}
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// creates the list of search keywords from the 's' parameters.
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function get_search_terms() {
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global $wpdb;
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$s = isset( $this->query_instance->query_vars['s'] ) ? $this->query_instance->query_vars['s'] : '';
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$sentence = isset( $this->query_instance->query_vars['sentence'] ) ? $this->query_instance->query_vars['sentence'] : false;
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$search_terms = array();
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if ( !empty( $s ) ) {
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// added slashes screw with quote grouping when done early, so done later
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$s = stripslashes( $s );
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if ( $sentence ) {
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$search_terms = array( $s );
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} else {
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preg_match_all( '/".*?("|$)|((?<=[\\s",+])|^)[^\\s",+]+/', $s, $matches );
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$search_terms = array_filter(array_map( create_function( '$a', 'return trim($a, "\\"\'\\n\\r ");' ), $matches[0] ));
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}
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}
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return $search_terms;
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}
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function init_tainacan_search_vars() {
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if (!$this->query_instance->is_search()) {
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$this->is_tainacan_search = false;
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return;
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}
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$post_types = $this->query_instance->get('post_type');
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$taxonomies = [];
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if (!$post_types || empty($post_types) || !is_array($post_types)) {
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$this->is_tainacan_search = false;
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} else {
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foreach ($post_types as $pt) {
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$pattern = '/^' . \Tainacan\Entities\Collection::$db_identifier_prefix . '.+' . \Tainacan\Entities\Collection::$db_identifier_sufix . '$/';
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if ( preg_match($pattern, $pt) ) {
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$this->is_tainacan_search = true;
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$taxonomies = array_merge( $taxonomies, get_object_taxonomies($pt) );
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} else {
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$this->is_tainacan_search = false;
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break;
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}
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}
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}
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if ( $this->is_tainacan_search ) {
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$taxonomies = array_unique($taxonomies);
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$this->taxonomies = $taxonomies;
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}
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}
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// add where clause to the search query
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function search_where( $where, $wp_query ) {
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$this->query_instance = &$wp_query;
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$this->init_tainacan_search_vars();
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if ( !$this->is_tainacan_search && !$this->ajax_request)
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return $where;
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global $wpdb;
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$searchQuery = $this->search_default();
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$searchQuery .= $this->build_search_categories();
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$searchQuery .= $this->build_search_metadata();
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$searchQuery .= $this->search_authors();
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if ( $searchQuery != '' ) {
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// lets use _OUR_ query instead of WP's, as we have posts already included in our query as well(assuming it's not empty which we check for)
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$where = " AND ((" . $searchQuery . ")) ";
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}
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return $where;
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}
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// search for terms in default locations like title and content
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// replacing the old search terms seems to be the best way to
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// avoid issue with multiple terms
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function search_default(){
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global $wpdb;
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$not_exact = empty($this->query_instance->query_vars['exact']);
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$search_sql_query = '';
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$seperator = '';
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$terms = $this->get_search_terms();
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// if it's not a sentance add other terms
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$search_sql_query .= '(';
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foreach ( $terms as $term ) {
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$search_sql_query .= $seperator;
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$esc_term = $wpdb->prepare("%s", $not_exact ? "%".$term."%" : $term);
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$like_title = "($wpdb->posts.post_title LIKE $esc_term)";
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$like_post = "($wpdb->posts.post_content LIKE $esc_term)";
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$search_sql_query .= "($like_title OR $like_post)";
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$seperator = ' AND ';
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}
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$search_sql_query .= ')';
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return $search_sql_query;
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}
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//Duplicate fix provided by Tiago.Pocinho
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function distinct( $query ) {
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global $wpdb;
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if ( !empty( $this->query_instance->query_vars['s'] ) ) {
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if ( strstr( $query, 'DISTINCT' ) ) {}
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else {
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$query = str_replace( 'SELECT', 'SELECT DISTINCT', $query );
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}
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}
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return $query;
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}
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//search attachments
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function search_attachments( $where ) {
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global $wpdb;
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if ( !empty( $this->query_instance->query_vars['s'] ) ) {
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$where = str_replace( '"', '\'', $where );
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if ( !$this->wp_ver28 ) {
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$where = str_replace( " AND (post_status = 'publish'", " AND (post_status = 'publish' OR post_type = 'attachment'", $where );
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$where = str_replace( "AND post_type != 'attachment'", "", $where );
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}
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else {
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$where = str_replace( " AND ($wpdb->posts.post_status = 'publish'", " AND ($wpdb->posts.post_status = 'publish' OR $wpdb->posts.post_type = 'attachment'", $where );
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$where = str_replace( "AND $wpdb->posts.post_type != 'attachment'", "", $where );
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}
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}
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return $where;
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}
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// Build the author search
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function search_authors() {
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global $wpdb;
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$s = $this->query_instance->query_vars['s'];
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$search_terms = $this->get_search_terms();
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$exact = ( isset( $this->query_instance->query_vars['exact'] ) && $this->query_instance->query_vars['exact'] ) ? true : false;
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$search = '';
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$searchand = '';
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if ( !empty( $search_terms ) ) {
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// Building search query
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foreach ( $search_terms as $term ) {
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$term = $wpdb->prepare("%s", $exact ? $term : "%$term%");
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$search .= "{$searchand}(u.display_name LIKE $term)";
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$searchand = ' OR ';
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}
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$sentence_term = $wpdb->prepare("%s", $s);
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if ( count( $search_terms ) > 1 && $search_terms[0] != $sentence_term ) {
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$search .= " OR (u.display_name LIKE $sentence_term)";
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}
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if ( !empty( $search ) )
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$search = " OR ({$search}) ";
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}
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return $search;
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}
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// create the search meta data query
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function build_search_metadata() {
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global $wpdb;
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$s = $this->query_instance->query_vars['s'];
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$search_terms = $this->get_search_terms();
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$exact = ( isset( $this->query_instance->query_vars['exact'] ) && $this->query_instance->query_vars['exact'] ) ? true : false;
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$search = '';
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if ( !empty( $search_terms ) ) {
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// Building search query
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$searchand = '';
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foreach ( $search_terms as $term ) {
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$term = $wpdb->prepare("%s", $exact ? $term : "%$term%");
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$search .= "{$searchand}(m.meta_value LIKE $term)";
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$searchand = ' AND ';
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}
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$sentence_term = $wpdb->prepare("%s", $s);
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if ( count( $search_terms ) > 1 && $search_terms[0] != $sentence_term ) {
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$search = "($search) OR (m.meta_value LIKE $sentence_term)";
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}
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if ( !empty( $search ) )
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$search = " OR ({$search}) ";
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}
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return $search;
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}
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// create the search categories query
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function build_search_categories() {
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global $wpdb;
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$vars = $this->query_instance->query_vars;
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$s = $vars['s'];
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$search_terms = $this->get_search_terms();
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$exact = isset( $vars['exact'] ) ? $vars['exact'] : '';
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$search = '';
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if ( !empty( $search_terms ) ) {
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// Building search query for categories slug.
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$searchand = '';
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$searchSlug = '';
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foreach ( $search_terms as $term ) {
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$term = $wpdb->prepare("%s", $exact ? $term : "%". sanitize_title_with_dashes($term) . "%");
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$searchSlug .= "{$searchand}(tter.slug LIKE $term)";
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$searchand = ' AND ';
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}
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$term = $wpdb->prepare("%s", $exact ? $term : "%". sanitize_title_with_dashes($s) . "%");
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if ( count( $search_terms ) > 1 && $search_terms[0] != $s ) {
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$searchSlug = "($searchSlug) OR (tter.slug LIKE $term)";
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}
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if ( !empty( $searchSlug ) )
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$search = " OR ({$searchSlug}) ";
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// Building search query for categories description.
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$searchand = '';
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$searchDesc = '';
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foreach ( $search_terms as $term ) {
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$term = $wpdb->prepare("%s", $exact ? $term : "%$term%");
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$searchDesc .= "{$searchand}(ttax.description LIKE $term)";
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$searchand = ' AND ';
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}
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$sentence_term = $wpdb->prepare("%s", $s);
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if ( count( $search_terms ) > 1 && $search_terms[0] != $sentence_term ) {
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$searchDesc = "($searchDesc) OR (ttax.description LIKE $sentence_term)";
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}
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if ( !empty( $searchDesc ) )
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$search = $search." OR ({$searchDesc}) ";
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}
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return $search;
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}
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//join for searching authors
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function search_authors_join( $join ) {
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global $wpdb;
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if ( !empty( $this->query_instance->query_vars['s'] ) ) {
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$join .= " LEFT JOIN $wpdb->users AS u ON ($wpdb->posts.post_author = u.ID) ";
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}
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return $join;
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}
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//join for searching metadata
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function search_metadata_join( $join ) {
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global $wpdb;
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if ( !empty( $this->query_instance->query_vars['s'] ) ) {
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$join .= " LEFT JOIN $wpdb->postmeta AS m ON ($wpdb->posts.ID = m.post_id) ";
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}
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return $join;
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}
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//join for searching tags
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function terms_join( $join ) {
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global $wpdb;
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if ( !empty( $this->query_instance->query_vars['s'] ) ) {
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foreach ( $this->taxonomies as $taxonomy ) {
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$on[] = "ttax.taxonomy = '" . addslashes( $taxonomy )."'";
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}
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// build our final string
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$on = ' ( ' . implode( ' OR ', $on ) . ' ) ';
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$join .= " LEFT JOIN $wpdb->term_relationships AS trel ON ($wpdb->posts.ID = trel.object_id) LEFT JOIN $wpdb->term_taxonomy AS ttax ON ( " . $on . " AND trel.term_taxonomy_id = ttax.term_taxonomy_id) LEFT JOIN $wpdb->terms AS tter ON (ttax.term_id = tter.term_id) ";
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}
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return $join;
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}
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} // END
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@ -135,4 +135,6 @@ require_once(__DIR__ . '/../theme-helper/class-tainacan-theme-helper.php');
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require_once(__DIR__ . '/../theme-helper/template-tags.php');
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$Tainacan_Theme_Helper = \Tainacan\Theme_Helper::get_instance();
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$Tainacan_Search_Engine = new \Tainacan\Search_Engine();
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?>
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