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<?php |
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/** |
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* Did You Mean feature. |
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* |
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* @since 4.6.0 |
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* @package elasticpress |
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*/ |
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|
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namespace ElasticPress\Feature\DidYouMean; |
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|
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use ElasticPress\{Elasticsearch, Feature, FeatureRequirementsStatus, Features }; |
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|
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/** |
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* Did You Mean feature class. |
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*/ |
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class DidYouMean extends Feature { |
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|
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/** |
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* Initialize feature, setting it's config. |
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*/ |
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public function __construct() { |
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$this->slug = 'did-you-mean'; |
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|
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$this->title = esc_html__( 'Did You Mean', 'elasticpress' ); |
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|
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$this->summary = __( 'Recommend alternative search terms for misspelled queries or terms with no results.', 'elasticpress' ); |
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|
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$this->requires_install_reindex = true; |
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|
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$this->available_during_installation = true; |
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|
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$this->default_settings = [ |
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'search_behavior' => false, |
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]; |
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|
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parent::__construct(); |
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} |
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|
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/** |
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* Setup search functionality. |
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* |
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* @return void |
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*/ |
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public function setup() { |
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add_filter( 'ep_post_mapping', [ $this, 'add_mapping' ] ); |
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add_filter( 'ep_post_formatted_args', [ $this, 'add_query_args' ], 10, 3 ); |
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add_filter( 'ep_integrate_search_queries', [ $this, 'set_ep_suggestion' ], 10, 2 ); |
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add_action( 'template_redirect', [ $this, 'automatically_redirect_user' ] ); |
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add_action( 'ep_suggestions', [ $this, 'the_output' ] ); |
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} |
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|
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/** |
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* Output feature box long. |
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* |
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* @return void |
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*/ |
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public function output_feature_box_long() { |
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?> |
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<p> |
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<?php |
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echo wp_kses_post( |
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sprintf( |
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/* translators: Tutorial URL */ |
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__( '"Did You Mean" search feature provides alternative suggestions for misspelled or ambiguous search queries, enhancing search accuracy and user experience. To display suggestions in your theme, please follow <a href="%s">this tutorial</a>.', 'elasticpress' ), |
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'https://elasticpress.zendesk.com/hc/en-us/articles/16673223107085-Did-You-Mean' |
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) |
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); |
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?> |
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</p> |
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<?php |
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} |
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|
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/** |
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* Add mapping. |
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* |
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* @param array $mapping Post mapping. |
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*/ |
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public function add_mapping( $mapping ) : array { |
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// Shingle token filter. |
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$mapping['settings']['analysis']['filter']['shingle_filter'] = [ |
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'type' => 'shingle', |
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'min_shingle_size' => 2, |
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'max_shingle_size' => 3, |
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]; |
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|
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// Custom analyzer. |
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$mapping['settings']['analysis']['analyzer']['trigram'] = [ |
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'type' => 'custom', |
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'tokenizer' => 'standard', |
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'filter' => [ |
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'lowercase', |
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'shingle_filter', |
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], |
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]; |
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|
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if ( version_compare( Elasticsearch::factory()->get_elasticsearch_version(), '7.0', '<' ) ) { |
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$mapping['mappings']['post']['properties']['post_content']['fields'] = [ |
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'shingle' => [ |
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'type' => 'text', |
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'analyzer' => 'trigram', |
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], |
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]; |
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} else { |
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$mapping['mappings']['properties']['post_content']['fields'] = [ |
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'shingle' => [ |
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'type' => 'text', |
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'analyzer' => 'trigram', |
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], |
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]; |
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} |
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|
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return $mapping; |
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} |
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|
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/** |
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* Return the suggested search term. |
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* |
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* @param WP_Query $query WP_Query object |
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* @return string|false |
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*/ |
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public function get_suggestion( $query = null ) { |
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global $wp_query; |
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|
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$settings = $this->get_settings(); |
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if ( empty( $settings['active'] ) ) { |
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return false; |
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} |
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|
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if ( ! $query && $wp_query->is_main_query() && $wp_query->is_search() ) { |
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$query = $wp_query; |
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} |
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|
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if ( ! is_a( $query, '\WP_Query' ) ) { |
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return false; |
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} |
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|
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$term = $this->get_suggested_term( $query ); |
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if ( empty( $term ) ) { |
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return false; |
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} |
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|
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$html = sprintf( '<span class="ep-spell-suggestion">%s: <a href="%s">%s</a>?</span>', esc_html__( 'Did you mean', 'elasticpress' ), get_search_link( $term ), $term ); |
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|
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$html .= $this->get_alternatives_terms( $query ); |
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$terms = $query->suggested_terms['options'] ?? []; |
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|
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/** |
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* Filter the did you mean suggested HTML. |
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* |
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* @since 4.6.0 |
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* @hook ep_suggestion_html |
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* @param {string} $html The HTML output. |
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* @param {array} $terms All suggested terms. |
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* @param {WP_Query} $query The WP_Query object. |
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* @return {string} New HTML output |
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*/ |
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return apply_filters( 'ep_suggestion_html', $html, $terms, $query ); |
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} |
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|
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/** |
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* If needed set the `suggest` to ES query clause. |
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* |
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* @param array $formatted_args Formatted Elasticsearch query. |
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* @param array $args WP_Query arguments |
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* @param array $wp_query WP_Query object |
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*/ |
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public function add_query_args( $formatted_args, $args, $wp_query ) : array { |
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$search_analyzer = [ |
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'phrase' => [ |
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'field' => 'post_content.shingle', |
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'max_errors' => 2, |
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'direct_generator' => [ |
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[ |
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'field' => 'post_content.shingle', |
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], |
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], |
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], |
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]; |
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|
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/** |
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* Filter the search analyzer use for the did you mean feature. |
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* |
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* @since 4.6.0 |
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* @hook ep_search_suggestion_analyzer |
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* @param {array} $search_analyzer Search analyzer |
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* @param {array} $formatted_args Formatted Elasticsearch query |
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* @param {array} $args WP_Query arguments |
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* @param {WP_Query} $wp_query WP_Query object |
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* @return {array} New search analyzer |
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*/ |
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$search_analyzer = apply_filters( 'ep_search_suggestion_analyzer', $search_analyzer, $formatted_args, $args, $wp_query ); |
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|
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if ( ! empty( $args['s'] ) ) { |
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$formatted_args['suggest'] = array( |
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'text' => $args['s'], |
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'ep_suggestion' => $search_analyzer, |
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); |
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} |
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|
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return $formatted_args; |
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} |
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|
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/** |
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* Set the ep_suggestion flag to true if the query is a search query. |
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* |
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* @param bool $enabled Whether to enable the search queries integration. |
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* @param WP_Query $query The WP_Query object. |
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*/ |
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public function set_ep_suggestion( $enabled, $query ) : bool { |
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if ( $query->is_search() && ! empty( $query->query_vars['s'] ) ) { |
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$query->set( 'ep_suggestion', true ); |
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} |
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|
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return $enabled; |
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} |
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|
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/** |
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* Returns requirements status of feature |
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* |
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* Requires the search feature to be activated |
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*/ |
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public function requirements_status() : FeatureRequirementsStatus { |
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$features = Features::factory(); |
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$search = $features->get_registered_feature( 'search' ); |
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|
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if ( ! $search->is_active() ) { |
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return new FeatureRequirementsStatus( 2, esc_html__( 'This feature requires the "Post Search" feature to be enabled', 'elasticpress' ) ); |
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} |
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|
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return new FeatureRequirementsStatus( 1 ); |
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} |
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|
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/** |
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* Display feature settings. |
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* |
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* @return void |
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*/ |
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public function output_feature_box_settings() { |
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$settings = $this->get_settings(); |
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?> |
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<div class="field"> |
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<div class="field-name status"><?php esc_html_e( 'Search behavior when no result is found', 'elasticpress' ); ?></div> |
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<div class="input-wrap"> |
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<label><input name="settings[search_behavior]" type="radio" <?php checked( ! (bool) $settings['search_behavior'] ); ?> value="0"><?php esc_html_e( 'Display the top suggestion', 'elasticpress' ); ?></label><br> |
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<label><input name="settings[search_behavior]" type="radio" <?php checked( $settings['search_behavior'], 'list' ); ?> value="list"><?php esc_html_e( 'Display all the suggestions', 'elasticpress' ); ?></label><br> |
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<label><input name="settings[search_behavior]" type="radio" <?php checked( $settings['search_behavior'], 'redirect' ); ?> value="redirect"><?php esc_html_e( 'Automatically redirect the user to the top suggestion', 'elasticpress' ); ?></label><br> |
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</div> |
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</div> |
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<?php |
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} |
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|
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/** |
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* Returns the list of other suggestions |
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* |
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* @param WP_Query $query WP_Query object |
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* @return string|false |
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*/ |
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protected function get_alternatives_terms( $query ) { |
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global $wp_query; |
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|
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if ( ! $query && $wp_query->is_main_query() && $wp_query->is_search() ) { |
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$query = $wp_query; |
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} |
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|
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if ( ! is_a( $query, '\WP_Query' ) ) { |
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return false; |
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} |
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|
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$settings = $this->get_settings(); |
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|
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// If there are posts, we don't need to show the list of suggestions. |
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if ( 'list' !== $settings['search_behavior'] || $query->found_posts ) { |
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return false; |
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} |
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|
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$options = $query->suggested_terms['options'] ?? []; |
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array_shift( $options ); |
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|
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if ( empty( $options ) ) { |
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return ''; |
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} |
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|
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$html = '<div class="ep-spell-suggestions">'; |
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$html .= esc_html__( 'Other suggestions:', 'elasticpress' ); |
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$html .= '<ul class="ep-suggestions-list">'; |
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foreach ( $options as $option ) { |
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$html .= sprintf( '<li><a href="%s">%s</a></li>', get_search_link( $option['text'] ), $option['text'] ); |
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} |
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$html .= '</ul>'; |
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$html .= '</div>'; |
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|
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return $html; |
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} |
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|
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/** |
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* Returns the top suggested term |
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* |
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* @param WP_Query $query WP_Query object |
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* @return string|bool |
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*/ |
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public function get_suggested_term( $query ) { |
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$options = $query->suggested_terms['options'] ?? []; |
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return ! empty( $options ) ? $options[0]['text'] : false; |
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} |
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|
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/** |
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* Redirect user to suggested search term if no results found and search_behavior is set to redirect. |
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* |
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* @return void |
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*/ |
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public function automatically_redirect_user() { |
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global $wp_query; |
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|
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if ( ! $wp_query->is_main_query() || ! $wp_query->is_search() ) { |
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return; |
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} |
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|
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if ( $wp_query->found_posts ) { |
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return; |
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} |
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|
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$settings = $this->get_settings(); |
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if ( 'redirect' !== $settings['search_behavior'] ) { |
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return; |
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} |
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|
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$term = $this->get_suggested_term( $wp_query ); |
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if ( empty( $term ) ) { |
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return; |
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} |
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|
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$url = get_search_link( $term ); |
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$url = add_query_arg( |
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[ |
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'ep_suggestion_original_term' => $wp_query->query_vars['s'], |
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], |
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$url |
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); |
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|
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wp_safe_redirect( $url ); |
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exit; |
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} |
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|
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/** |
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* Return a message to the user when the original search term has no results and the user is redirected to the suggested term. |
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* |
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* @param WP_Query $query WP_Query object |
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* |
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* @return string|void |
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*/ |
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public function get_original_search_term( $query = null ) { |
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global $wp_query; |
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|
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$settings = $this->get_settings(); |
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if ( empty( $settings['active'] ) ) { |
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return false; |
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} |
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|
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if ( ! $query && $wp_query->is_main_query() && $wp_query->is_search() ) { |
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$query = $wp_query; |
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} |
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|
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if ( ! is_a( $query, '\WP_Query' ) ) { |
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return; |
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} |
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|
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if ( ! isset( $_GET['ep_suggestion_original_term'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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return; |
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} |
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|
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$settings = $this->get_settings(); |
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if ( 'redirect' !== $settings['search_behavior'] ) { |
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return; |
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} |
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|
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$original_term = sanitize_text_field( wp_unslash( $_GET['ep_suggestion_original_term'] ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
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|
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$html = sprintf( |
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'<div class="ep-original-search-term-message"> |
| 380 |
<span class="result">%s</span><strong>%s</strong> |
| 381 |
<br/> |
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<span class="no-result">%s</span><strong>%s</strong> |
| 383 |
</div>', |
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esc_html__( 'Showing results for: ', 'elasticpress' ), |
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esc_html( $query->query_vars['s'] ), |
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esc_html__( 'No results for: ', 'elasticpress' ), |
| 387 |
esc_html( $original_term ) |
| 388 |
); |
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|
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/** |
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* Filter the HTML output for the original search term. |
| 392 |
* |
| 393 |
* @since 4.6.0 |
| 394 |
* @hook ep_suggestion_original_search_term_html |
| 395 |
* @param {string} $html HTML output |
| 396 |
* @param {string} $search_term Suggested search term |
| 397 |
* @param {string} $original_term Original search term |
| 398 |
* @param {WP_Query} $query WP_Query object |
| 399 |
* @return {string} New HTML output |
| 400 |
*/ |
| 401 |
return apply_filters( 'ep_suggestion_original_search_term_html', $html, $query->query_vars['s'], $original_term, $query ); |
| 402 |
} |
| 403 |
|
| 404 |
/** |
| 405 |
* Returns the suggestion |
| 406 |
* |
| 407 |
* @param WP_Query $query WP_Query object |
| 408 |
* @return void |
| 409 |
*/ |
| 410 |
public function the_output( $query = null ) { |
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$html = $this->get_original_search_term( $query ); |
| 412 |
$html .= $this->get_suggestion( $query ); |
| 413 |
|
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echo wp_kses_post( $html ); |
| 415 |
} |
| 416 |
} |
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|
