Move search algorithms to separate classes

elasticpress.php

@@ -157,6 +157,13 @@ function register_indexable_posts() {
 			new Feature\Terms\Terms()
 		);
 	}
+
+	/**
+	 * Register search algorithms
+	 */
+	SearchAlgorithms::factory()->register( new SearchAlgorithm\DefaultAlgorithm() );
+	SearchAlgorithms::factory()->register( new SearchAlgorithm\Version_350() );
+	SearchAlgorithms::factory()->register( new SearchAlgorithm\Version_400() );
 }
 add_action( 'plugins_loaded', __NAMESPACE__ . '\register_indexable_posts' );
 

includes/classes/Feature/Autosuggest/Autosuggest.php

@@ -79,7 +79,7 @@ public function setup() {
 		add_action( 'wp_enqueue_scripts', [ $this, 'enqueue_scripts' ] );
 		add_filter( 'ep_post_mapping', [ $this, 'mapping' ] );
 		add_filter( 'ep_post_sync_args', [ $this, 'filter_term_suggest' ], 10 );
-		add_filter( 'ep_fuzziness_arg', [ $this, 'set_fuzziness' ], 10, 3 );
+		add_filter( 'ep_post_fuzziness_arg', [ $this, 'set_fuzziness' ], 10, 3 );
 		add_filter( 'ep_weighted_query_for_post_type', [ $this, 'adjust_fuzzy_fields' ], 10, 3 );
 		add_filter( 'ep_saved_weighting_configuration', [ $this, 'epio_send_autosuggest_public_request' ] );
 		add_filter( 'wp', [ $this, 'epio_send_autosuggest_allowed' ] );

includes/classes/Indexable.php

@@ -1172,4 +1172,30 @@ public function generate_mapping() {
 
 		return [];
 	}
+
+	/**
+	 * Get the search algorithm that should be used.
+	 *
+	 * @since 4.3.0
+	 * @param string $search_text   Search term(s)
+	 * @param array  $search_fields Search fields
+	 * @param array  $query_vars    Query vars
+	 * @return SearchAlgorithm Instance of search algorithm to be used
+	 */
+	public function get_search_algorithm( string $search_text, array $search_fields, array $query_vars ) : \ElasticPress\SearchAlgorithm {
+		/**
+		 * Filter the search algorithm to be used
+		 *
+		 * @hook ep_{$indexable_slug}_search_algorithm
+		 * @since  4.3.0
+		 * @param  {string} $search_algorithm Slug of the search algorithm used as fallback
+		 * @param  {string} $search_term      Search term
+		 * @param  {array}  $search_fields    Fields to be searched
+		 * @param  {array}  $query_vars       Query variables
+		 * @return {string} New search algorithm slug
+		 */
+		$search_algorithm = apply_filters( "ep_{$this->slug}_search_algorithm", 'basic', $search_text, $search_fields, $query_vars );
+
+		return \ElasticPress\SearchAlgorithms::factory()->get( $search_algorithm );
+	}
 }

includes/classes/Indexable/Comment/Comment.php

@@ -529,84 +529,8 @@ public function format_args( $query_vars ) {
 			 */
 			$prepared_search_fields = apply_filters( 'ep_comment_search_fields', $prepared_search_fields, $query_vars );
 
-			$query = [
-				'bool' => [
-					'should' => [
-						[
-							'multi_match' => [
-								'query'  => $search,
-								'type'   => 'phrase',
-								'fields' => $prepared_search_fields,
-								/**
-								 * Filter boost for comment match phrase query
-								 *
-								 * @hook ep_comment_match_phrase_boost
-								 * @since 3.6.0
-								 * @param {int} $boost Phrase boost
-								 * @param {array} $prepared_search_fields Search fields
-								 * @param {array} $query_vars Query variables
-								 * @return {int} New phrase boost
-								 */
-								'boost'  => apply_filters( 'ep_comment_match_phrase_boost', 4, $prepared_search_fields, $query_vars ),
-							],
-						],
-						[
-							'multi_match' => [
-								'query'     => $search,
-								'fields'    => $prepared_search_fields,
-								/**
-								 * Filter boost for comment match query
-								 *
-								 * @hook ep_comment_match_boost
-								 * @param {int} $boost Boost
-								 * @param {array} $prepared_search_fields Search fields
-								 * @param {array} $query_vars Query variables
-								 * @return {int} New boost
-								 */
-								'boost'     => apply_filters( 'ep_comment_match_boost', 2, $prepared_search_fields, $query_vars ),
-								'fuzziness' => 0,
-								'operator'  => 'and',
-							],
-						],
-						[
-							'multi_match' => [
-								'fields'    => $prepared_search_fields,
-								'query'     => $search,
-								/**
-								 * Filter fuzziness for post query
-								 *
-								 * @hook ep_comment_fuzziness_arg
-								 * @since 3.6.0
-								 * @param {int} $fuzziness Fuzziness
-								 * @param {array} $prepared_search_fields Search fields
-								 * @param {array} $query_vars Query variables
-								 * @return {int} New fuzziness
-								 */
-								'fuzziness' => apply_filters( 'ep_comment_fuzziness_arg', 1, $prepared_search_fields, $query_vars ),
-							],
-						],
-					],
-				],
-			];
-
-			/**
-			 * Filter formatted Elasticsearch post query (only contains query part)
-			 *
-			 * @hook ep_comment_formatted_args_query
-			 * @since 3.6.0
-			 * @param {array}  $query         Current query
-			 * @param {array}  $query_vars    Query variables
-			 * @param {string} $search_text   Search text
-			 * @param {array}  $search_fields Search fields
-			 * @return {array} New query
-			 */
-			$formatted_args['query'] = apply_filters(
-				'ep_comment_formatted_args_query',
-				$query,
-				$query_vars,
-				$search,
-				$prepared_search_fields
-			);
+			$search_algorithm        = $this->get_search_algorithm( $search, $prepared_search_fields, $query_vars );
+			$formatted_args['query'] = $search_algorithm->get_query( 'comment', $search, $prepared_search_fields, $query_vars );
 		} else {
 			$formatted_args['query']['match_all'] = [
 				'boost' => 1,