class-frontend-views.php

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<?php
/**
 * GravityView Frontend functions
 *
 * @package GravityView
 * @license GPL2+
 * @author GravityView <[email protected]>
 * @link http://gravityview.co
 * @copyright Copyright 2014, Katz Web Services, Inc.
 *
 * @since 1.0.0
 */


class GravityView_frontend {

 /**
 * Regex strings that are used to determine whether the current request is a GravityView search or not.
 *
 * @see GravityView_frontend::is_searching()
 * @since 1.7.4.1
 * @var array
 */
 private static $search_parameters = array( 'gv_search', 'gv_start', 'gv_end', 'gv_id', 'gv_by', 'filter_*' );

 /**
 * Is the currently viewed post a `gravityview` post type?
 *
 * @var boolean
 */
 var $is_gravityview_post_type = false;

 /**
 * Does the current post have a `[gravityview]` shortcode?
 *
 * @var boolean
 */
 var $post_has_shortcode = false;

 /**
 * The Post ID of the currently viewed post. Not necessarily GV
 *
 * @var int
 */
 var $post_id = null;

 /**
 * Are we currently viewing a single entry?
 * If so, the int value of the entry ID. Otherwise, false.
 *
 * @var int|boolean
 */
 var $single_entry = false;

 /**
 * If we are viewing a single entry, the entry data
 *
 * @var array|false
 */
 var $entry = false;

 /**
 * When displaying the single entry we should always know to which View it belongs (the context is everything!)
 *
 * @var null
 */
 var $context_view_id = null;

 /**
 * The View is showing search results
 *
 * @since 1.5.4
 * @var boolean
 */
 var $is_search = false;

 /**
 * The view data parsed from the $post
 *
 * @see GravityView_View_Data::__construct()
 * @var GravityView_View_Data
 */
 var $gv_output_data = null;

 /**
 * @var GravityView_frontend
 */
 static $instance;

 /**
 * Class constructor, enforce Singleton pattern
 */
 private function __construct() {}

 private function initialize() {
 add_action( 'wp', array( $this, 'parse_content' ), 11 );
 add_filter( 'render_block', array( $this, 'detect_views_in_block_content' ) );
 add_filter( 'parse_query', array( $this, 'parse_query_fix_frontpage' ), 10 );
 add_action( 'template_redirect', array( $this, 'set_entry_data' ), 1 );

 // Enqueue scripts and styles after GravityView_Template::register_styles()
 add_action( 'wp_enqueue_scripts', array( $this, 'add_scripts_and_styles' ), 20 );

 // Enqueue and print styles in the footer. Added 1 priorty so stuff gets printed at 10 priority.
 add_action( 'wp_print_footer_scripts', array( $this, 'add_scripts_and_styles' ), 1 );

 add_filter( 'the_title', array( $this, 'single_entry_title' ), 1, 2 );
 add_filter( 'comments_open', array( $this, 'comments_open' ), 10, 2 );

 add_action( 'gravityview_after', array( $this, 'context_not_configured_warning' ) );
 add_filter( 'gravityview/template/text/no_entries', array( $this, 'filter_no_entries_output' ), 10, 3 );
 }

 /**
 * Get the one true instantiated self
 *
 * @return GravityView_frontend
 */
 public static function getInstance() {

 if ( empty( self::$instance ) ) {
 self::$instance = new self();
 self::$instance->initialize();
 }

 return self::$instance;
 }

 /**
 * @return GravityView_View_Data
 */
 public function getGvOutputData() {
 return $this->gv_output_data;
 }

 /**
 * @param \GravityView_View_Data $gv_output_data
 */
 public function setGvOutputData( $gv_output_data ) {
 $this->gv_output_data = $gv_output_data;
 }

 /**
 * @return boolean
 */
 public function isSearch() {
 return $this->is_search;
 }

 /**
 * @param boolean $is_search
 */
 public function setIsSearch( $is_search ) {
 $this->is_search = $is_search;
 }

 /**
 * @return bool|int
 */
 public function getSingleEntry() {
 return $this->single_entry;
 }

 /**
 * Sets the single entry ID and also the entry
 *
 * @param bool|int|string $single_entry
 */
 public function setSingleEntry( $single_entry ) {

 $this->single_entry = $single_entry;

 }

 /**
 * @return array
 */
 public function getEntry() {
 return $this->entry;
 }

 /**
 * Set the current entry
 *
 * @param array|int $entry Entry array or entry slug or ID
 */
 public function setEntry( $entry ) {

 if ( ! is_array( $entry ) ) {
 $entry = GVCommon::get_entry( $entry );
 }

 $this->entry = $entry;
 }

 /**
 * @return int
 */
 public function getPostId() {
 return $this->post_id;
 }

 /**
 * @param int $post_id
 */
 public function setPostId( $post_id ) {
 $this->post_id = $post_id;
 }

 /**
 * @return boolean
 */
 public function isPostHasShortcode() {
 return $this->post_has_shortcode;
 }

 /**
 * @param boolean $post_has_shortcode
 */
 public function setPostHasShortcode( $post_has_shortcode ) {
 $this->post_has_shortcode = $post_has_shortcode;
 }

 /**
 * @return boolean
 */
 public function isGravityviewPostType() {
 return $this->is_gravityview_post_type;
 }

 /**
 * @param boolean $is_gravityview_post_type
 */
 public function setIsGravityviewPostType( $is_gravityview_post_type ) {
 $this->is_gravityview_post_type = $is_gravityview_post_type;
 }

 /**
 * Set the context view ID used when page contains multiple embedded views or displaying the single entry view
 *
 * @param null $view_id
 */
 public function set_context_view_id( $view_id = null ) {
 $multiple_views = $this->getGvOutputData() && $this->getGvOutputData()->has_multiple_views();

 if ( ! empty( $view_id ) ) {

 $this->context_view_id = (int) $view_id;

 } elseif ( isset( $_GET['gvid'] ) && $multiple_views ) {
 /**
 * used on a has_multiple_views context
 *
 * @see GravityView_API::entry_link
 */
 $this->context_view_id = (int) $_GET['gvid'];

 } elseif ( ! $multiple_views ) {
 $array_keys = array_keys( $this->getGvOutputData()->get_views() );
 $this->context_view_id = (int) array_pop( $array_keys );
 unset( $array_keys );
 }

 }

 /**
 * Returns the the view_id context when page contains multiple embedded views or displaying single entry view
 *
 * @since 1.5.4
 *
 * @return int|null
 */
 public function get_context_view_id() {
 return $this->context_view_id;
 }

 /**
 * Allow GravityView entry endpoints on the front page of a site
 *
 * @link https://core.trac.wordpress.org/ticket/23867 Fixes this core issue
 * @link https://wordpress.org/plugins/cpt-on-front-page/ Code is based on this
 *
 * @since 1.17.3
 *
 * @param WP_Query &$query (passed by reference)
 *
 * @return void
 */
 public function parse_query_fix_frontpage( &$query ) {
 global $wp_rewrite;

 $is_front_page = ( $query->is_home || $query->is_page );
 $show_on_front = ( 'page' === get_option( 'show_on_front' ) );
 $front_page_id = get_option( 'page_on_front' );

 if ( $is_front_page && $show_on_front && $front_page_id ) {

 // Force to be an array, potentially a query string ( entry=16 )
 $_query = wp_parse_args( $query->query );

 // pagename can be set and empty depending on matched rewrite rules. Ignore an empty pagename.
 if ( isset( $_query['pagename'] ) && '' === $_query['pagename'] ) {
 unset( $_query['pagename'] );
 }

 // this is where will break from core WordPress
 /** @internal Don't use this filter; it will be unnecessary soon - it's just a patch for specific use case */
 $ignore = apply_filters( 'gravityview/internal/ignored_endpoints', array( 'preview', 'page', 'paged', 'cpage' ), $query );
 $endpoints = \GV\Utils::get( $wp_rewrite, 'endpoints' );
 foreach ( (array) $endpoints as $endpoint ) {
 $ignore[] = $endpoint[1];
 }
 unset( $endpoints );

 // Modify the query if:
 // - We're on the "Page on front" page (which we are), and:
 // - The query is empty OR
 // - The query includes keys that are associated with registered endpoints. `entry`, for example.
 if ( empty( $_query ) || ! array_diff( array_keys( $_query ), $ignore ) ) {

 $qv =& $query->query_vars;

 // Prevent redirect when on the single entry endpoint
 if ( self::is_single_entry() ) {
 add_filter( 'redirect_canonical', '__return_false' );
 }

 $query->is_page = true;
 $query->is_home = false;
 $qv['page_id'] = $front_page_id;

 // Correct <!--nextpage--> for page_on_front
 if ( ! empty( $qv['paged'] ) ) {
 $qv['page'] = $qv['paged'];
 unset( $qv['paged'] );
 }
 }

 // reset the is_singular flag after our updated code above
 $query->is_singular = $query->is_single || $query->is_page || $query->is_attachment;
 }
 }

 /**
 * Detect GV Views in parsed Gutenberg block content
 *
 * @since 2.13.4
 *
 * @see \WP_Block::render()
 *
 * @param string $block_content Gutenberg block content
 *
 * @return false|string
 *
 * @todo Once we stop using the legacy `GravityView_frontend::parse_content()` method to detect Views in post content, this code should either be dropped or promoted to some core class given its applicability to other themes/plugins
 */
 public function detect_views_in_block_content( $block_content ) {
 if ( ! class_exists( 'GV\View_Collection' ) || ! class_exists( 'GV\View' ) ) {
 return $block_content;
 }

 $gv_view_data = GravityView_View_Data::getInstance();

 $views = \GV\View_Collection::from_content( $block_content );

 foreach ( $views->all() as $view ) {
 if ( ! $gv_view_data->views->contains( $view->ID ) ) {
 $gv_view_data->views->add( $view );
 }
 }

 return $block_content;
 }

 /**
 * Read the $post and process the View data inside
 *
 * @param array $wp Passed in the `wp` hook. Not used.
 * @return void
 */
 public function parse_content( $wp = array() ) {
 global $post;

 // If in admin and NOT AJAX request, get outta here.
 if ( gravityview()->request->is_admin() ) {
 return;
 }

 $is_GV_post_type = 'gravityview' === get_post_type( $post );

 // Calculate requested Views
 $post_content = ! empty( $post->post_content ) ? $post->post_content : null;

 if ( ! $is_GV_post_type && function_exists( 'parse_blocks' ) && preg_match_all( '/"ref":\d+/', $post_content ) ) {
 $blocks = parse_blocks( $post_content );

 foreach ( $blocks as $block ) {
 if ( empty( $block['attrs']['ref'] ) ) {
 continue;
 }

 $block_post = get_post( $block['attrs']['ref'] );

 if ( $block_post ) {
 $post_content .= $block_post->post_content;
 }
 }

 $this->setGvOutputData( GravityView_View_Data::getInstance( $post_content ) );
 } else {
 $this->setGvOutputData( GravityView_View_Data::getInstance( $post ) );
 }

 // !important: we need to run this before getting single entry (to kick the advanced filter)
 $this->set_context_view_id();

 $this->setIsGravityviewPostType( $is_GV_post_type );

 $post_id = $this->getPostId() ? $this->getPostId() : ( isset( $post ) ? $post->ID : null );
 $this->setPostId( $post_id );
 $post_has_shortcode = $post_content ? gravityview_has_shortcode_r( $post_content, 'gravityview' ) : false;
 $this->setPostHasShortcode( $this->isGravityviewPostType() ? null : ! empty( $post_has_shortcode ) );

 // check if the View is showing search results (only for multiple entries View)
 $this->setIsSearch( $this->is_searching() );

 unset( $entry, $post_id, $post_has_shortcode );
 }

 /**
 * Set the entry
 */
 function set_entry_data() {
 $entry_id = self::is_single_entry();
 $this->setSingleEntry( $entry_id );
 $this->setEntry( $entry_id );
 }

 /**
 * Checks if the current View is presenting search results
 *
 * @since 1.5.4
 *
 * @return boolean True: Yes, it's a search; False: No, not a search.
 */
 function is_searching() {

 // It's a single entry, not search
 if ( $this->getSingleEntry() ) {
 return false;
 }

 $search_method = GravityView_Widget_Search::getInstance()->get_search_method();

 if ( 'post' === $search_method ) {
 $get = $_POST;
 } else {
 $get = $_GET;
 }

 // No $_GET parameters
 if ( empty( $get ) || ! is_array( $get ) ) {
 return false;
 }

 // Remove empty values
 $get = array_filter( $get );

 // If the $_GET parameters are empty, it's no search.
 if ( empty( $get ) ) {
 return false;
 }

 $search_keys = array_keys( $get );

 $search_match = implode( '|', self::$search_parameters );

 foreach ( $search_keys as $search_key ) {

 // Analyze the search key $_GET parameter and see if it matches known GV args
 if ( preg_match( '/(' . $search_match . ')/i', $search_key ) ) {
 return true;
 }
 }

 return false;
 }

 /**
 * Filter the title for the single entry view
 *
 * @param string $passed_title Current title
 * @param int $passed_post_id Post ID
 * @return string (modified) title
 */
 public function single_entry_title( $passed_title, $passed_post_id = null ) {
 global $post;

 // Since this is a public method, it can be called outside of the plugin. Don't assume things have been loaded properly.
 if ( ! class_exists( '\GV\Entry' ) ) {
 return $passed_title;
 }

 $gventry = gravityview()->request->is_entry();

 // If this is the directory view, return.
 if ( ! $gventry ) {
 return $passed_title;
 }

 $entry = $gventry->as_entry();

 /**
 * @filter `gravityview/single/title/out_loop` Apply the Single Entry Title filter outside the WordPress loop?
 * @param boolean $in_the_loop Whether to apply the filter to the menu title and the meta tag <title> - outside the loop
 * @param array $entry Current entry
 */
 $apply_outside_loop = apply_filters( 'gravityview/single/title/out_loop', in_the_loop(), $entry );

 if ( ! $apply_outside_loop ) {
 return $passed_title;
 }

 // WooCommerce doesn't $post_id
 if ( empty( $passed_post_id ) ) {
 return $passed_title;
 }

 // Don't modify the title for anything other than the current view/post.
 // This is true for embedded shortcodes and Views.
 if ( is_object( $post ) && (int) $post->ID !== (int) $passed_post_id ) {
 return $passed_title;
 }

 $view = gravityview()->request->is_view();

 if ( $view ) {
 return $this->_get_single_entry_title( $view, $entry, $passed_title );
 }

 $_gvid = \GV\Utils::_GET( 'gvid', null );

 // $_GET['gvid'] is set; we know what View to render
 if ( $_gvid ) {

 $view = \GV\View::by_id( $_gvid );

 return $this->_get_single_entry_title( $view, $entry, $passed_title );
 }

 global $post;

 if ( ! $post ) {
 return $passed_title;
 }

 $view_collection = \GV\View_Collection::from_post( $post );

 // We have multiple Views, but no gvid...this isn't valid security
 if ( 1 < $view_collection->count() ) {
 return $passed_title;
 }

 return $this->_get_single_entry_title( $view_collection->first(), $entry, $passed_title );
 }

 /**
 * Returns the single entry title for a View with variables replaced and shortcodes parsed
 *
 * @since 2.7.2
 *
 * @param \GV\View|null $view
 * @param array $entry
 * @param string $passed_title
 *
 * @return string
 */
 private function _get_single_entry_title( $view, $entry = array(), $passed_title = '' ) {

 if ( ! $view ) {
 return $passed_title;
 }

 /**
 * @filter `gravityview/single/title/check_entry_display` Override whether to check entry display rules against filters
 * @internal This might change in the future! Don't rely on it.
 * @since 2.7.2
 * @param bool $check_entry_display Check whether the entry is visible for the current View configuration. Default: true.
 * @param array $entry Gravity Forms entry array
 * @param \GV\View $view The View
 */
 $check_entry_display = apply_filters( 'gravityview/single/title/check_entry_display', true, $entry, $view );

 if ( $check_entry_display ) {

 $check_display = GVCommon::check_entry_display( $entry, $view );

 if ( is_wp_error( $check_display ) ) {
 return $passed_title;
 }
 }

 $title = $view->settings->get( 'single_title', $passed_title );

 $form = GVCommon::get_form( $entry['form_id'] );

 // We are allowing HTML in the fields, so no escaping the output
 $title = GravityView_API::replace_variables( $title, $form, $entry );

 $title = do_shortcode( $title );

 return $title;
 }


 /**
 * In case View post is called directly, insert the view in the post content
 *
 * @deprecated {@see \GV\View::content()} instead.
 *
 * @static
 * @param mixed $content
 * @return string Add the View output into View CPT content
 */
 public function insert_view_in_content( $content ) {
 gravityview()->log->notice( '\GravityView_frontend::insert_view_in_content is deprecated. Use \GV\View::content()' );
 return \GV\View::content( $content );
 }

 /**
 * Disable comments on GravityView post types
 *
 * @param boolean $open existing status
 * @param int $post_id Post ID
 * @return boolean
 */
 public function comments_open( $open, $post_id ) {

 if ( $this->isGravityviewPostType() ) {
 $open = false;
 }

 /**
 * @filter `gravityview/comments_open` Whether to set comments to open or closed.
 * @since 1.5.4
 * @param boolean $open Open or closed status
 * @param int $post_id Post ID to set comment status for
 */
 $open = apply_filters( 'gravityview/comments_open', $open, $post_id );

 return $open;
 }

 /**
 * Display a warning when a View has not been configured
 *
 * @since 1.19.2
 * @used-by \GV\Renderer::maybe_print_notices()
 * @depecated 2.0
 *
 * @param int $view_id The ID of the View currently being displayed
 *
 * @return void
 */
 public function context_not_configured_warning( $view_id = 0 ) {

 if ( ! class_exists( 'GravityView_View' ) ) {
 return;
 }

 $fields = GravityView_View::getInstance()->getContextFields();

 if ( ! empty( $fields ) ) {
 return;
 }

 $context = GravityView_View::getInstance()->getContext();

 switch ( $context ) {
 case 'directory':
 $tab = esc_html__( 'Multiple Entries', 'gk-gravityview' );
 break;
 case 'edit':
 $tab = esc_html__( 'Edit Entry', 'gk-gravityview' );
 break;
 case 'single':
 default:
 $tab = esc_html__( 'Single Entry', 'gk-gravityview' );
 break;
 }

 $title = sprintf( esc_html_x( 'The %s layout has not been configured.', 'Displayed when a View is not configured. %s is replaced by the tab label', 'gk-gravityview' ), $tab );
 $edit_link = admin_url( sprintf( 'post.php?post=%d&action=edit#%s-view', $view_id, $context ) );
 $action_text = sprintf( esc_html__( 'Add fields to %s', 'gk-gravityview' ), $tab );
 $message = esc_html__( 'You can only see this message because you are able to edit this View.', 'gk-gravityview' );

 $image = sprintf( '<img alt="%s" src="%s" style="margin-top: 10px;" />', $tab, esc_url( plugins_url( sprintf( 'assets/images/tab-%s.png', $context ), GRAVITYVIEW_FILE ) ) );
 $output = sprintf( '<h3>%s <strong><a href="%s">%s</a></strong></h3><p>%s</p>', $title, esc_url( $edit_link ), $action_text, $message );

 echo GVCommon::generate_notice( $output . $image, 'gv-error error', 'edit_gravityview', $view_id );
 }

 /**
 * Modify what happens when there are no entries in the View based on View settings.
 *
 * @since 2.17
 *
 * @param string $output The existing 'No Entries' text.
 * @param boolean $is_search Is the current page a search result, or just a multiple entries screen?
 * @param \GV\Template_Context|null $context The context, if available.
 *
 * @return string|void If search, existing text. If form, new 'No Entries' text.
 */
 public function filter_no_entries_output( $no_entries_text, $is_search, $context = null ) {

 // Only proceed if it's not a search and we aren't using legacy paths.
 if ( $is_search || ! $context instanceof \GV\Template_Context ) {
 return $no_entries_text;
 }

 $no_entries_option = (int) $context->view->settings->get( 'no_entries_options', 0 );

 // Default is to display the message.
 if ( empty( $no_entries_option ) ) {
 return $no_entries_text;
 }

 if ( 1 === $no_entries_option ) {
 $form_id = (int) $context->view->settings->get( 'no_entries_form' );

 if ( ! empty( $form_id ) ) {

 $output = '
<style>
 .gv-table-multiple-container:has( .gv-no-results-form ) th,
 .gv-table-multiple-container:has( .gv-no-results-form ) td {
 padding: 0;
 }
 .gv-table-multiple-container:has( .gv-no-results-form ) thead,
 .gv-table-multiple-container:has( .gv-no-results-form ) tfoot,
 .gv-table-multiple-container:has( .gv-no-results-form ) + .gv-powered-by {
 display: none;
 }
</style>';

 $form_title = $context->view->settings->get( 'no_entries_form_title', true );
 $form_desc = $context->view->settings->get( 'no_entries_form_description', true );

 $output .= \GFForms::get_form( $form_id, $form_title, $form_desc );

 return $output;
 }
 }

 if ( 2 === $no_entries_option ) {

 $no_entries_redirect = $context->view->settings->get( 'no_entries_redirect' );

 if ( $no_entries_redirect ) {
 $redirect_url = GFCommon::replace_variables( $no_entries_redirect, $context->form, $context->entry, false, false, false, 'text' );

 $redirected = wp_redirect( $redirect_url );

 if ( defined( 'DOING_GRAVITYVIEW_TESTS' ) && DOING_GRAVITYVIEW_TESTS ) {
 return $redirected;
 }

 exit;
 }
 }

 return $no_entries_text;
 }


 /**
 * Core function to render a View based on a set of arguments
 *
 * @static
 * @param array $passed_args {
 *
 * Settings for rendering the View
 *
 * @type int $id View id
 * @type int $page_size Number of entries to show per page
 * @type string $sort_field Form field id to sort
 * @type string $sort_direction Sorting direction ('ASC', 'DESC', or 'RAND')
 * @type string $start_date - Ymd
 * @type string $end_date - Ymd
 * @type string $class - assign a html class to the view
 * @type string $offset (optional) - This is the start point in the current data set (0 index based).
 * }
 *
 * @deprecated Use \GV\View_Renderer
 *
 * @return string|null HTML output of a View, NULL if View isn't found
 */
 public function render_view( $passed_args ) {
 gravityview()->log->notice( '\GravityView_frontend::render_view is deprecated. Use \GV\View_Renderer etc.' );

 /**
 * We can use a shortcode here, since it's pretty much the same.
 *
 * But we do need to check embed permissions, since shortcodes don't do this.
 */

 if ( ! $view = gravityview()->views->get( $passed_args ) ) {
 return null;
 }

 $view->settings->update( $passed_args );

 $direct_access = apply_filters( 'gravityview_direct_access', true, $view->ID );
 $embed_only = $view->settings->get( 'embed_only' );

 if ( ! $direct_access || ( $embed_only && ! GVCommon::has_cap( 'read_private_gravityviews' ) ) ) {
 return __( 'You are not allowed to view this content.', 'gk-gravityview' );
 }

 $shortcode = new \GV\Shortcodes\gravityview();
 return $shortcode->callback( $passed_args );
 }

 /**
 * Process the start and end dates for a view - overrides values defined in shortcode (if needed)
 *
 * The `start_date` and `end_date` keys need to be in a format processable by GFFormsModel::get_date_range_where(),
 * which uses \DateTime() format.
 *
 * You can set the `start_date` or `end_date` to any value allowed by {@link http://www.php.net//manual/en/function.strtotime.php strtotime()},
 * including strings like "now" or "-1 year" or "-3 days".
 *
 * @see GFFormsModel::get_date_range_where
 *
 * @param array $args View settings
 * @param array $search_criteria Search being performed, if any
 * @return array Modified `$search_criteria` array
 */
 public static function process_search_dates( $args, $search_criteria = array() ) {

 $return_search_criteria = $search_criteria;

 foreach ( array( 'start_date', 'end_date' ) as $key ) {

 // Is the start date or end date set in the view or shortcode?
 // If so, we want to make sure that the search doesn't go outside the bounds defined.
 if ( ! empty( $args[ $key ] ) ) {

 // Get a timestamp and see if it's a valid date format
 $date = strtotime( $args[ $key ], GFCommon::get_local_timestamp() );

 // The date was invalid
 if ( empty( $date ) ) {
 gravityview()->log->error(
 ' Invalid {key} date format: {format}',
 array(
 'key' => $key,
 'format' => $args[ $key ],
 )
 );
 continue;
 }

 // The format that Gravity Forms expects for start_date and day-specific (not hour/second-specific) end_date
 $datetime_format = 'Y-m-d H:i:s';
 $search_is_outside_view_bounds = false;

 if ( ! empty( $search_criteria[ $key ] ) ) {

 $search_date = strtotime( $search_criteria[ $key ], GFCommon::get_local_timestamp() );

 // The search is for entries before the start date defined by the settings
 switch ( $key ) {
 case 'end_date':
 /**
 * If the end date is formatted as 'Y-m-d', it should be formatted without hours and seconds
 * so that Gravity Forms can convert the day to 23:59:59 the previous day.
 *
 * If it's a relative date ("now" or "-1 day"), then it should use the precise date format
 *
 * @see GFFormsModel::get_date_range_where
 */
 $datetime_format = gravityview_is_valid_datetime( $args[ $key ] ) ? 'Y-m-d' : $datetime_format;
 $search_is_outside_view_bounds = ( $search_date > $date );
 break;
 case 'start_date':
 $search_is_outside_view_bounds = ( $search_date < $date );
 break;
 }
 }

 // If there is no search being performed, or if there is a search being performed that's outside the bounds
 if ( empty( $search_criteria[ $key ] ) || $search_is_outside_view_bounds ) {

 // Then we override the search and re-set the start date
 $return_search_criteria[ $key ] = date_i18n( $datetime_format, $date, true );
 }
 }
 }

 if ( isset( $return_search_criteria['start_date'] ) && isset( $return_search_criteria['end_date'] ) ) {
 // The start date is AFTER the end date. This will result in no results, but let's not force the issue.
 if ( strtotime( $return_search_criteria['start_date'] ) > strtotime( $return_search_criteria['end_date'] ) ) {
 gravityview()->log->error( 'Invalid search: the start date is after the end date.', array( 'data' => $return_search_criteria ) );
 }
 }

 return $return_search_criteria;
 }


 /**
 * Process the approved only search criteria according to the View settings
 *
 * @param array $args View settings
 * @param array $search_criteria Search being performed, if any
 * @return array Modified `$search_criteria` array
 */
 public static function process_search_only_approved( $args, $search_criteria ) {

 /** @since 1.19 */
 if ( ! empty( $args['admin_show_all_statuses'] ) && GVCommon::has_cap( 'gravityview_moderate_entries' ) ) {
 gravityview()->log->debug( 'User can moderate entries; showing all approval statuses' );
 return $search_criteria;
 }

 if ( ! empty( $args['show_only_approved'] ) ) {

 $search_criteria['field_filters'][] = array(
 'key' => GravityView_Entry_Approval::meta_key,
 'value' => GravityView_Entry_Approval_Status::APPROVED,
 );

 $search_criteria['field_filters']['mode'] = 'all'; // force all the criterias to be met

 gravityview()->log->debug( '[process_search_only_approved] Search Criteria if show only approved: ', array( 'data' => $search_criteria ) );
 }

 return $search_criteria;
 }


 /**
 * Check if a certain entry is approved.
 *
 * If we pass the View settings ($args) it will check the 'show_only_approved' setting before
 * checking the entry approved field, returning true if show_only_approved = false.
 *
 * @since 1.7
 * @since 1.18 Converted check to use GravityView_Entry_Approval_Status::is_approved
 *
 * @uses GravityView_Entry_Approval_Status::is_approved
 *
 * @param array $entry Entry object
 * @param array $args View settings (optional)
 *
 * @return bool
 */
 public static function is_entry_approved( $entry, $args = array() ) {

 if ( empty( $entry['id'] ) || ( array_key_exists( 'show_only_approved', $args ) && ! $args['show_only_approved'] ) ) {
 // is implicitly approved if entry is null or View settings doesn't require to check for approval
 return true;
 }

 /** @since 1.19 */
 if ( ! empty( $args['admin_show_all_statuses'] ) && GVCommon::has_cap( 'gravityview_moderate_entries' ) ) {
 gravityview()->log->debug( 'User can moderate entries, so entry is approved for viewing' );
 return true;
 }

 $is_approved = gform_get_meta( $entry['id'], GravityView_Entry_Approval::meta_key );

 return GravityView_Entry_Approval_Status::is_approved( $is_approved );
 }

 /**
 * Parse search criteria for a entries search.
 *
 * array(
 * 'search_field' => 1, // ID of the field
 * 'search_value' => '', // Value of the field to search
 * 'search_operator' => 'contains', // 'is', 'isnot', '>', '<', 'contains'
 * 'show_only_approved' => 0 or 1 // Boolean
 * )
 *
 * @param array $args Array of args
 * @param int $form_id Gravity Forms form ID
 * @return array Array of search parameters, formatted in Gravity Forms mode, using `status` key set to "active" by default, `field_filters` array with `key`, `value` and `operator` keys.
 */
 public static function get_search_criteria( $args, $form_id ) {
 /**
 * Compatibility with filters hooking in `gravityview_search_criteria` instead of `gravityview_fe_search_criteria`.
 */
 $criteria = apply_filters( 'gravityview_search_criteria', array(), array( $form_id ), \GV\Utils::get( $args, 'id' ) );
 $search_criteria = isset( $criteria['search_criteria'] ) ? $criteria['search_criteria'] : array( 'field_filters' => array() );

 /**
 * @filter `gravityview_fe_search_criteria` Modify the search criteria
 * @see GravityView_Widget_Search::filter_entries Adds the default search criteria
 * @param array $search_criteria Empty `field_filters` key
 * @param int $form_id ID of the Gravity Forms form that is being searched
 * @param array $args The View settings.
 */
 $search_criteria = apply_filters( 'gravityview_fe_search_criteria', $search_criteria, $form_id, $args );

 if ( ! is_array( $search_criteria ) ) {
 return array();
 }

 $original_search_criteria = $search_criteria;

 gravityview()->log->debug( '[get_search_criteria] Search Criteria after hook gravityview_fe_search_criteria: ', array( 'data' => $search_criteria ) );

 // implicity search
 if ( ! empty( $args['search_value'] ) ) {

 // Search operator options. Options: `is` or `contains`
 $operator = ! empty( $args['search_operator'] ) && in_array( $args['search_operator'], array( 'is', 'isnot', '>', '<', 'contains' ) ) ? $args['search_operator'] : 'contains';

 $search_criteria['field_filters'][] = array(
 'key' => \GV\Utils::_GET( 'search_field', \GV\Utils::get( $args, 'search_field' ) ), // The field ID to search
 'value' => _wp_specialchars( $args['search_value'] ), // The value to search. Encode ampersands but not quotes.
 'operator' => $operator,
 );

 // Lock search mode to "all" with implicit presearch filter.
 $search_criteria['field_filters']['mode'] = 'all';
 }

 if ( $search_criteria !== $original_search_criteria ) {
 gravityview()->log->debug( '[get_search_criteria] Search Criteria after implicity search: ', array( 'data' => $search_criteria ) );
 }

 // Handle setting date range
 $search_criteria = self::process_search_dates( $args, $search_criteria );

 if ( $search_criteria !== $original_search_criteria ) {
 gravityview()->log->debug( '[get_search_criteria] Search Criteria after date params: ', array( 'data' => $search_criteria ) );
 }

 // remove not approved entries
 $search_criteria = self::process_search_only_approved( $args, $search_criteria );

 /**
 * @filter `gravityview_status` Modify entry status requirements to be included in search results.
 * @param string $status Default: `active`. Accepts all Gravity Forms entry statuses, including `spam` and `trash`
 */
 $search_criteria['status'] = apply_filters( 'gravityview_status', 'active', $args );

 return $search_criteria;
 }



 /**
 * Core function to calculate View multi entries (directory) based on a set of arguments ($args):
 * $id - View id
 * $page_size - Page
 * $sort_field - form field id to sort
 * $sort_direction - ASC / DESC
 * $start_date - Ymd
 * $end_date - Ymd
 * $class - assign a html class to the view
 * $offset (optional) - This is the start point in the current data set (0 index based).
 *
 * @uses gravityview_get_entries()
 * @param array $args\n
 * - $id - View id
 * - $page_size - Page
 * - $sort_field - form field id to sort
 * - $sort_direction - ASC / DESC
 * - $start_date - Ymd
 * - $end_date - Ymd
 * - $class - assign a html class to the view
 * - $offset (optional) - This is the start point in the current data set (0 index based).
 * @param int $form_id Gravity Forms Form ID
 * @return array Associative array with `count`, `entries`, and `paging` keys. `count` has the total entries count, `entries` is an array with Gravity Forms full entry data, `paging` is an array with `offset` and `page_size` keys
 */
 public static function get_view_entries( $args, $form_id ) {

 gravityview()->log->debug( '[get_view_entries] init' );
 // start filters and sorting

 $parameters = self::get_view_entries_parameters( $args, $form_id );

 $count = 0; // Must be defined so that gravityview_get_entries can use by reference

 // fetch entries
 list( $entries, $paging, $count ) =
 \GV\Mocks\GravityView_frontend_get_view_entries( $args, $form_id, $parameters, $count );

 gravityview()->log->debug(
 'Get Entries. Found: {count} entries',
 array(
 'count' => $count,
 'data' => $entries,
 )
 );

 /**
 * @filter `gravityview_view_entries` Filter the entries output to the View
 * @deprecated since 1.5.2
 * @param array $args View settings associative array
 * @var array
 */
 $entries = apply_filters( 'gravityview_view_entries', $entries, $args );

 $return = array(
 'count' => $count,
 'entries' => $entries,
 'paging' => $paging,
 );

 /**
 * @filter `gravityview/view/entries` Filter the entries output to the View
 * @param array $criteria associative array containing count, entries & paging
 * @param array $args View settings associative array
 * @since 1.5.2
 */
 return apply_filters( 'gravityview/view/entries', $return, $args );
 }

 /**
 * Get an array of search parameters formatted as Gravity Forms requires
 *
 * Results are filtered by `gravityview_get_entries` and `gravityview_get_entries_{View ID}` filters
 *
 * @uses GravityView_frontend::get_search_criteria
 * @uses GravityView_frontend::get_search_criteria_paging
 *
 * @since 1.20
 *
 * @see \GV\View_Settings::defaults For $args options
 *
 * @param array $args Array of View settings, as structured in \GV\View_Settings::defaults
 * @param int $form_id Gravity Forms form ID to search
 *
 * @return array With `search_criteria`, `sorting`, `paging`, `cache` keys
 */
 public static function get_view_entries_parameters( $args = array(), $form_id = 0 ) {

 if ( ! is_array( $args ) || ! is_numeric( $form_id ) ) {

 gravityview()->log->error( 'Passed args are not an array or the form ID is not numeric' );

 return array();
 }

 $form_id = intval( $form_id );

 /**
 * Process search parameters
 *
 * @var array
 */
 $search_criteria = self::get_search_criteria( $args, $form_id );

 $paging = self::get_search_criteria_paging( $args );

 $parameters = array(
 'search_criteria' => $search_criteria,
 'sorting' => self::updateViewSorting( $args, $form_id ),
 'paging' => $paging,
 'cache' => isset( $args['cache'] ) ? $args['cache'] : true,
 );

 /**
 * @filter `gravityview_get_entries` Filter get entries criteria
 * @param array $parameters Array with `search_criteria`, `sorting` and `paging` keys.
 * @param array $args View configuration args. {
 * @type int $id View id
 * @type int $page_size Number of entries to show per page
 * @type string $sort_field Form field id to sort
 * @type string $sort_direction Sorting direction ('ASC', 'DESC', or 'RAND')
 * @type string $start_date - Ymd
 * @type string $end_date - Ymd
 * @type string $class - assign a html class to the view
 * @type string $offset (optional) - This is the start point in the current data set (0 index based).
 * }
 * @param int $form_id ID of Gravity Forms form
 */
 $parameters = apply_filters( 'gravityview_get_entries', $parameters, $args, $form_id );

 /**
 * @filter `gravityview_get_entries_{View ID}` Filter get entries criteria
 * @param array $parameters Array with `search_criteria`, `sorting` and `paging` keys.
 * @param array $args View configuration args.
 */
 $parameters = apply_filters( 'gravityview_get_entries_' . \GV\Utils::get( $args, 'id' ), $parameters, $args, $form_id );

 gravityview()->log->debug( '$parameters passed to gravityview_get_entries(): ', array( 'data' => $parameters ) );

 return $parameters;
 }

 /**
 * Get the paging array for the View
 *
 * @since 1.19.5
 *
 * @param $args
 * @param int $form_id
 */
 public static function get_search_criteria_paging( $args ) {

 /**
 * @filter `gravityview_default_page_size` The default number of entries displayed in a View
 * @since 1.1.6
 * @param int $default_page_size Default: 25
 */
 $default_page_size = apply_filters( 'gravityview_default_page_size', 25 );

 // Paging & offset
 $page_size = ! empty( $args['page_size'] ) ? intval( $args['page_size'] ) : $default_page_size;

 if ( -1 === $page_size ) {
 $page_size = PHP_INT_MAX;
 }

 $curr_page = empty( $_GET['pagenum'] ) ? 1 : intval( $_GET['pagenum'] );
 $offset = ( $curr_page - 1 ) * $page_size;

 if ( ! empty( $args['offset'] ) ) {
 $offset += intval( $args['offset'] );
 }

 $paging = array(
 'offset' => $offset,
 'page_size' => $page_size,
 );

 gravityview()->log->debug( 'Paging: ', array( 'data' => $paging ) );

 return $paging;
 }

 /**
 * Updates the View sorting criteria
 *
 * @since 1.7
 *
 * @param array $args View settings. Required to have `sort_field` and `sort_direction` keys
 * @param int $form_id The ID of the form used to sort
 * @return array $sorting Array with `key`, `direction` and `is_numeric` keys
 */
 public static function updateViewSorting( $args, $form_id ) {
 $sorting = array();

 $has_values = isset( $_GET['sort'] );

 if ( $has_values && is_array( $_GET['sort'] ) ) {
 $sorts = array_keys( $_GET['sort'] );
 $dirs = array_values( $_GET['sort'] );

 if ( $has_values = array_filter( $dirs ) ) {
 $sort_field_id = end( $sorts );
 $sort_direction = end( $dirs );
 }
 }

 if ( ! isset( $sort_field_id ) ) {
 $sort_field_id = isset( $_GET['sort'] ) ? $_GET['sort'] : \GV\Utils::get( $args, 'sort_field' );
 }

 if ( ! isset( $sort_direction ) ) {
 $sort_direction = isset( $_GET['dir'] ) ? $_GET['dir'] : \GV\Utils::get( $args, 'sort_direction' );
 }

 if ( is_array( $sort_field_id ) ) {
 $sort_field_id = array_pop( $sort_field_id );
 }

 if ( is_array( $sort_direction ) ) {
 $sort_direction = array_pop( $sort_direction );
 }

 if ( ! empty( $sort_field_id ) ) {
 if ( is_array( $sort_field_id ) ) {
 $sort_direction = array_values( $sort_field_id );
 $sort_field_id = array_keys( $sort_field_id );

 $sort_field_id = reset( $sort_field_id );
 $sort_direction = reset( $sort_direction );
 }

 $sort_field_id = self::_override_sorting_id_by_field_type( $sort_field_id, $form_id );
 $sorting = array(
 'key' => $sort_field_id,
 'direction' => strtolower( $sort_direction ),
 'is_numeric' => GVCommon::is_field_numeric( $form_id, $sort_field_id ),
 );

 if ( 'RAND' === $sort_direction ) {

 $form = GFAPI::get_form( $form_id );

 // Get the first GF_Field field ID, set as the key for entry randomization
 if ( ! empty( $form['fields'] ) ) {

 /** @var GF_Field $field */
 foreach ( $form['fields'] as $field ) {
 if ( ! is_a( $field, 'GF_Field' ) ) {
 continue;
 }

 $sorting = array(
 'key' => $field->id,
 'is_numeric' => false,
 'direction' => 'RAND',
 );

 break;
 }
 }
 }
 }

 if ( ! class_exists( 'GravityView_View' ) ) {
 gravityview()->plugin->include_legacy_frontend( true );
 }

 GravityView_View::getInstance()->setSorting( $sorting );

 gravityview()->log->debug( '[updateViewSorting] Sort Criteria : ', array( 'data' => $sorting ) );

 return $sorting;

 }

 /**
 * Override sorting per field
 *
 * Currently only modifies sorting ID when sorting by the full name. Sorts by first name.
 * Use the `gravityview/sorting/full-name` filter to override.
 *
 * @todo Filter from GravityView_Field
 * @since 1.7.4
 * @internal Hi developer! Although this is public, don't call this method; we're going to replace it.
 *
 * @param int|string|array $sort_field_id Field used for sorting (`id` or `1.2`), or an array for multisorts
 * @param int $form_id GF Form ID
 *
 * @return string|array Possibly modified sorting ID. Array if $sort_field_id is passed as array.
 */
 public static function _override_sorting_id_by_field_type( $sort_field_id, $form_id ) {

 if ( is_array( $sort_field_id ) ) {
 $modified_ids = array();
 foreach ( $sort_field_id as $_sort_field_id ) {
 $modified_ids [] = self::_override_sorting_id_by_field_type( $_sort_field_id, $form_id );
 }
 return $modified_ids;
 }

 $form = gravityview_get_form( $form_id );

 $sort_field = GFFormsModel::get_field( $form, $sort_field_id );

 if ( ! $sort_field ) {
 return $sort_field_id;
 }

 switch ( $sort_field['type'] ) {

 case 'address':
 // Sorting by full address
 if ( floatval( $sort_field_id ) === floor( $sort_field_id ) ) {

 /**
 * Override how to sort when sorting address
 *
 * @since 1.8
 *
 * @param string $address_part `street`, `street2`, `city`, `state`, `zip`, or `country` (default: `city`)
 * @param string $sort_field_id Field used for sorting
 * @param int $form_id GF Form ID
 */
 $address_part = apply_filters( 'gravityview/sorting/address', 'city', $sort_field_id, $form_id );

 switch ( strtolower( $address_part ) ) {
 case 'street':
 $sort_field_id .= '.1';
 break;
 case 'street2':
 $sort_field_id .= '.2';
 break;
 default:
 case 'city':
 $sort_field_id .= '.3';
 break;
 case 'state':
 $sort_field_id .= '.4';
 break;
 case 'zip':
 $sort_field_id .= '.5';
 break;
 case 'country':
 $sort_field_id .= '.6';
 break;
 }
 }
 break;
 case 'name':
 // Sorting by full name, not first, last, etc.
 if ( floatval( $sort_field_id ) === floor( $sort_field_id ) ) {
 /**
 * @filter `gravityview/sorting/full-name` Override how to sort when sorting full name.
 * @since 1.7.4
 * @param string $name_part Sort by `first` or `last` (default: `first`)
 * @param string $sort_field_id Field used for sorting
 * @param int $form_id GF Form ID
 */
 $name_part = apply_filters( 'gravityview/sorting/full-name', 'first', $sort_field_id, $form_id );

 if ( 'last' === strtolower( $name_part ) ) {
 $sort_field_id .= '.6';
 } else {
 $sort_field_id .= '.3';
 }
 }
 break;
 case 'list':
 $sort_field_id = false;
 break;
 case 'time':
 /**
 * @filter `gravityview/sorting/time` Override how to sort when sorting time
 * @see GravityView_Field_Time
 * @since 1.14
 * @param string $name_part Field used for sorting
 * @param int $form_id GF Form ID
 */
 $sort_field_id = apply_filters( 'gravityview/sorting/time', $sort_field_id, $form_id );
 break;
 }

 return $sort_field_id;
 }

 /**
 * Verify if user requested a single entry view
 *
 * @since 2.3.3 Added return null
 * @return boolean|string|null false if not, single entry slug if true, null if \GV\Entry doesn't exist yet
 */
 public static function is_single_entry() {

 // Since this is a public method, it can be called outside of the plugin. Don't assume things have been loaded properly.
 if ( ! class_exists( '\GV\Entry' ) ) {

 // Not using gravityview()->log->error(), since that may not exist yet either!
 do_action( 'gravityview_log_error', '\GV\Entry not defined yet. Backtrace: ' . wp_debug_backtrace_summary() );

 return null;
 }

 $var_name = \GV\Entry::get_endpoint_name();

 $single_entry = get_query_var( $var_name );

 /**
 * Modify the entry that is being displayed.
 *
 * @internal Should only be used by things like the oEmbed functionality.
 * @since 1.6
 */
 $single_entry = apply_filters( 'gravityview/is_single_entry', $single_entry );

 if ( empty( $single_entry ) ) {
 return false;
 } else {
 return $single_entry;
 }
 }


 /**
 * Register styles and scripts
 *
 * @return void
 */
 public function add_scripts_and_styles() {
 global $post, $posts;
 // enqueue template specific styles
 if ( $this->getGvOutputData() ) {

 $views = $this->getGvOutputData()->get_views();

 foreach ( $views as $view_id => $data ) {
 $view = \GV\View::by_id( $data['id'] );
 $view_id = $view->ID;
 $template_id = gravityview_get_template_id( $view->ID );
 $data = $view->as_data();

 // By default, no thickbox
 $js_dependencies = array( 'jquery', 'gravityview-jquery-cookie' );
 $css_dependencies = array();

 $lightbox = $view->settings->get( 'lightbox' );

 // If the thickbox is enqueued, add dependencies
 if ( $lightbox ) {

 global $wp_filter;

 /**
 * @filter `gravity_view_lightbox_script` Override the lightbox script to enqueue. Default: `thickbox`
 * @param string $script_slug If you want to use a different lightbox script, return the name of it here.
 * @deprecated 2.5.1 Naming. See `gravityview_lightbox_script` instead.
 */
 $js_dependency = apply_filters_deprecated( 'gravity_view_lightbox_script', array( 'thickbox' ), '2.5.1', 'gravityview_lightbox_script' );

 /**
 * @filter `gravityview_lightbox_script` Override the lightbox script to enqueue. Default: `thickbox`
 * @since 2.5.1
 * @param string $script_slug If you want to use a different lightbox script, return the name of it here.
 * @param \GV\View The View.
 */
 $js_dependency = apply_filters( 'gravityview_lightbox_script', $js_dependency, $view );
 $js_dependencies[] = $js_dependency;

 /**
 * @filter `gravity_view_lightbox_style` Modify the lightbox CSS slug. Default: `thickbox`
 * @param string $script_slug If you want to use a different lightbox script, return the name of its CSS file here.
 * @deprecated 2.5.1 Naming. See `gravityview_lightbox_style` instead.
 */
 $css_dependency = apply_filters_deprecated( 'gravity_view_lightbox_style', array( 'thickbox' ), '2.5.1', 'gravityview_lightbox_style' );

 /**
 * @filter `gravityview_lightbox_script` Override the lightbox script to enqueue. Default: `thickbox`
 * @since 2.5.1
 * @param string $script_slug If you want to use a different lightbox script, return the name of it here.
 * @param \GV\View The View.
 */
 $css_dependency = apply_filters( 'gravityview_lightbox_style', $css_dependency, $view );
 $css_dependencies[] = $css_dependency;
 }

 /**
 * If the form has checkbox fields, enqueue dashicons
 *
 * @see https://github.com/katzwebservices/GravityView/issues/536
 * @since 1.15
 */
 if ( gravityview_view_has_single_checkbox_or_radio( $data['form'], $data['fields'] ) ) {
 $css_dependencies[] = 'dashicons';
 }

 wp_register_script( 'gravityview-jquery-cookie', plugins_url( 'assets/lib/jquery.cookie/jquery.cookie.min.js', GRAVITYVIEW_FILE ), array( 'jquery' ), GV_PLUGIN_VERSION, true );

 $script_debug = ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) ? '' : '.min';

 wp_register_script( 'gravityview-fe-view', plugins_url( 'assets/js/fe-views' . $script_debug . '.js', GRAVITYVIEW_FILE ), apply_filters( 'gravityview_js_dependencies', $js_dependencies ), GV_PLUGIN_VERSION, true );

 wp_enqueue_script( 'gravityview-fe-view' );

 if ( ! empty( $data['atts']['sort_columns'] ) ) {
 wp_enqueue_style( 'gravityview_font', plugins_url( 'assets/css/font.css', GRAVITYVIEW_FILE ), $css_dependencies, GV_PLUGIN_VERSION, 'all' );
 }

 $this->enqueue_default_style( $css_dependencies );

 self::add_style( $template_id );
 }

 if ( 'wp_print_footer_scripts' === current_filter() ) {

 $js_localization = array(
 'cookiepath' => COOKIEPATH,
 'clear' => _x( 'Clear', 'Clear all data from the form', 'gk-gravityview' ),
 'reset' => _x( 'Reset', 'Reset the search form to the state that existed on page load', 'gk-gravityview' ),
 );

 /**
 * @filter `gravityview_js_localization` Modify the array passed to wp_localize_script()
 * @param array $js_localization The data padded to the Javascript file
 * @param array $views Array of View data arrays with View settings
 */
 $js_localization = apply_filters( 'gravityview_js_localization', $js_localization, $views );

 wp_localize_script( 'gravityview-fe-view', 'gvGlobals', $js_localization );
 }
 }
 }

 /**
 * Handle enqueuing the `gravityview_default_style` stylesheet
 *
 * @since 1.17
 *
 * @param array $css_dependencies Dependencies for the `gravityview_default_style` stylesheet
 *
 * @return void
 */
 private function enqueue_default_style( $css_dependencies = array() ) {

 /**
 * @filter `gravityview_use_legacy_search_css` Should GravityView use the legacy Search Bar stylesheet (from before Version 1.17)?
 * @since 1.17
 * @param bool $use_legacy_search_style If true, loads `gv-legacy-search(-rtl).css`. If false, loads `gv-default-styles(-rtl).css`. `-rtl` is added on RTL websites. Default: `false`
 */
 $use_legacy_search_style = apply_filters( 'gravityview_use_legacy_search_style', false );

 $rtl = is_rtl() ? '-rtl' : '';

 $css_file_base = $use_legacy_search_style ? 'gv-legacy-search' : 'gv-default-styles';

 $path = gravityview_css_url( $css_file_base . $rtl . '.css' );

 wp_enqueue_style( 'gravityview_default_style', $path, $css_dependencies, GV_PLUGIN_VERSION, 'all' );
 }

 /**
 * Add template extra style if exists
 *
 * @param string $template_id
 */
 public static function add_style( $template_id ) {

 if ( ! empty( $template_id ) && wp_style_is( 'gravityview_style_' . $template_id, 'registered' ) ) {
 gravityview()->log->debug( 'Adding extra template style for {template_id}', array( 'template_id' => $template_id ) );
 wp_enqueue_style( 'gravityview_style_' . $template_id );
 } elseif ( empty( $template_id ) ) {
 gravityview()->log->error( 'Cannot add template style; template_id is empty' );
 } else {
 gravityview()->log->error( 'Cannot add template style; {template_id} is not registered', array( 'template_id' => 'gravityview_style_' . $template_id ) );
 }

 }


 /**
 * Inject the sorting links on the table columns
 *
 * Callback function for hook 'gravityview/template/field_label'
 *
 * @see GravityView_API::field_label() (in includes/class-api.php)
 *
 * @since 1.7
 *
 * @param string $label Field label.
 * @param array $field Field settings.
 * @param array $form Form object.
 *
 * @return string Field Label.
 */
 public function add_columns_sort_links( $label = '', $field = array(), $form = array() ) {

 /**
 * Not a table-based template; don't add sort icons
 *
 * @since 1.12
 */
 if ( ! preg_match( '/table/ism', GravityView_View::getInstance()->getTemplatePartSlug() ) ) {
 return $label;
 }

 if ( ! $this->is_field_sortable( $field['id'], $form ) ) {
 return $label;
 }

 $sorting = GravityView_View::getInstance()->getSorting();

 $class = 'gv-sort';

 $sort_field_id = self::_override_sorting_id_by_field_type( $field['id'], $form['id'] );

 $sort_args = array(
 'sort' => $field['id'],
 'dir' => 'asc',
 );

 if ( ! empty( $sorting['key'] ) && (string) $sort_field_id === (string) $sorting['key'] ) {
 // toggle sorting direction.
 if ( 'asc' === $sorting['direction'] ) {
 $sort_args['dir'] = 'desc';
 $class .= ' gv-icon-sort-desc';
 } else {
 $sort_args['dir'] = 'asc';
 $class .= ' gv-icon-sort-asc';
 }
 } else {
 $class .= ' gv-icon-caret-up-down';
 }

 $url = add_query_arg( $sort_args, remove_query_arg( array( 'pagenum' ) ) );

 return '<a href="' . esc_url_raw( $url ) . '" class="' . $class . '" ></a>&nbsp;' . $label;

 }

 /**
 * Checks if field (column) is sortable
 *
 * @param string $field Field settings
 * @param array $form Gravity Forms form array
 *
 * @since 1.7
 *
 * @return bool True: Yes, field is sortable; False: not sortable
 */
 public function is_field_sortable( $field_id = '', $form = array() ) {

 $field_type = $field_id;

 if ( is_numeric( $field_id ) ) {
 $field = GFFormsModel::get_field( $form, $field_id );
 $field_type = $field ? $field->type : $field_id;
 }

 $not_sortable = array(
 'edit_link',
 'delete_link',
 );

 /**
 * @depecated 2.14
 * @since 1.7
 */
 $not_sortable = apply_filters_deprecated( 'gravityview/sortable/field_blacklist', array( $not_sortable, $field_type, $form ), '2.14', 'gravityview/sortable/field_blocklist' );

 /**
 * @filter `gravityview/sortable/field_blocklist` Modify what fields should never be sortable.
 * @since 2.14
 * @param array $not_sortable Array of field types that aren't sortable.
 * @param string $field_type Field type to check whether the field is sortable.
 * @param array $form Gravity Forms form.
 */
 $not_sortable = apply_filters( 'gravityview/sortable/field_blocklist', $not_sortable, $field_type, $form );

 if ( in_array( $field_type, $not_sortable ) ) {
 return false;
 }

 return apply_filters( "gravityview/sortable/formfield_{$form['id']}_{$field_id}", apply_filters( "gravityview/sortable/field_{$field_id}", true, $form ) );

 }

}

GravityView_frontend::getInstance();