Source of class-acf-location-post-format.php - main

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<?php 
​
if( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
​
if( ! class_exists('ACF_Location_Post_Format') ) :
​
class ACF_Location_Post_Format extends ACF_Location {
    
    /**
     * Initializes props.
     *
     * @date    5/03/2014
     * @since   5.0.0
     *
     * @param   void
     * @return  void
     */
    public function initialize() {
        $this->name = 'post_format';
        $this->label = __( "Post Format", 'acf' );
        $this->category = 'post';
        $this->object_type = 'post';
    }
    
    /**
     * Matches the provided rule against the screen args returning a bool result.
     *
     * @date    9/4/20
     * @since   5.9.0
     *
     * @param   array $rule The location rule.
     * @param   array $screen The screen args.
     * @param   array $field_group The field group settings.
     * @return  bool
     */
    public function match( $rule, $screen, $field_group ) {
        
        // Check screen args.
        if( isset($screen['post_format']) ) {
            $post_format = $screen['post_format'];
        } elseif( isset($screen['post_id']) ) {
            $post_type = get_post_type( $screen['post_id'] );
            $post_format = get_post_format( $screen['post_id'] );
            
            // Treat new posts (that support post-formats) without a saved format as "standard".
            if( !$post_format && post_type_supports($post_type, 'post-formats') ) {
                $post_format = 'standard';
            }
        } else {
            return false;
        }
        
        // Compare rule against $post_format.
        return $this->compare_to_rule( $post_format, $rule );
    }
    
    /**
     * Returns an array of possible values for this rule type.
     *
     * @date    9/4/20
     * @since   5.9.0
     *
     * @param   array $rule A location rule.
     * @return  array
     */
    public function get_values( $rule ) {
        return get_post_format_strings();
    }
}
​
// initialize
acf_register_location_type( 'ACF_Location_Post_Format' );
​
endif; // class_exists check