Jetpack_Widget_Conditions - Code Metrics - Inspection of "Merge branch 'master' into try/jetpack-stories-blo..." - Automattic/jetpack - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — try/jetpack-stories-block-mobi... ( 2fea66 )

unknown
created 2020-11-02 14:54 UTC
Jetpack_Widget_Conditions F

↳ Parent: Project
Complexity

Total Complexity
173
Size/Duplication

Total Lines	937
Duplicated Lines	4.91 %
Coupling/Cohesion

Components	1
Dependencies	1
Importance

Changes
Metric	Value
dl	46
loc	937
rs	1.663
c	0
b	0
f	0
wmc	173
lcom	1
cbo	1
12 Methods

Rating	Name	Duplication	Size	Complexity
A	init()	0	11	3
F	widget_admin_setup()	0	215	14
A	get_pages()	0	42	2
F	widget_conditions_admin()	0	160	17
C	widget_update()	0	60	14
C	sidebars_widgets()	0	46	13
A	template_redirect()	0	3	1
A	generate_condition_key()	0	6	2
F	filter_widget()	46	250	89
A	strcasecmp_name()	0	3	1
A	maybe_get_split_term()	0	13	3
C	migrate_post_type_rules()	0	61	14
How to fix Duplicated Code Complexity

Duplicated Code

Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
If you have the same expression in different places: Extract expression to a method
If you have the same method in different sub-classes: Extract method, and pull up field to the parent class
If you have the same code in unrelated classes: Consider extracting the code to a new class, and injecting that class
Complex Class

Tip: Before tackling complexity, make sure that you eliminate any duplication first. This often can reduce the size of classes significantly.
Complex classes like Jetpack_Widget_Conditions often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Jetpack_Widget_Conditions, and based on these observations, apply Extract Interface, too.
<?php

use Automattic\Jetpack\Assets;

/**
 * Hide or show widgets conditionally.
 */

class Jetpack_Widget_Conditions {
	static $passed_template_redirect = false;

	public static function init() {
		if ( is_admin() ) {
			add_action( 'sidebar_admin_setup', array( __CLASS__, 'widget_admin_setup' ) );
			add_filter( 'widget_update_callback', array( __CLASS__, 'widget_update' ), 10, 3 );
			add_action( 'in_widget_form', array( __CLASS__, 'widget_conditions_admin' ), 10, 3 );
		} elseif ( ! in_array( $GLOBALS['pagenow'], array( 'wp-login.php', 'wp-register.php' ) ) ) {
			add_filter( 'widget_display_callback', array( __CLASS__, 'filter_widget' ) );
			add_filter( 'sidebars_widgets', array( __CLASS__, 'sidebars_widgets' ) );
			add_action( 'template_redirect', array( __CLASS__, 'template_redirect' ) );
		}
	}

	public static function widget_admin_setup() {
		$current_screen = get_current_screen();
		// TODO: Replace `$current_screen->is_block_editor()` with `wp_should_load_block_editor_scripts_and_styles()` that is introduced in WP 5.6
		if ( method_exists( $current_screen, 'is_block_editor' ) && $current_screen->is_block_editor() ) {
			return;
		}

		wp_enqueue_style( 'widget-conditions', plugins_url( 'widget-conditions/widget-conditions.css', __FILE__ ) );
		wp_style_add_data( 'widget-conditions', 'rtl', 'replace' );
		wp_enqueue_script(
			'widget-conditions',
			Assets::get_file_url_for_environment(
				'_inc/build/widget-visibility/widget-conditions/widget-conditions.min.js',
				'modules/widget-visibility/widget-conditions/widget-conditions.js'
			),
			array( 'jquery', 'jquery-ui-core' ),
			20191128,
			true
		);

		// Set up a single copy of all of the data that Widget Visibility needs.
		// This allows all widget conditions to reuse the same data, keeping page size down
		// and eliminating the AJAX calls we used to have to use to fetch the minor rule options.
		$widget_conditions_data = array();

		$widget_conditions_data['category']   = array();
		$widget_conditions_data['category'][] = array( '', __( 'All category pages', 'jetpack' ) );

		$categories = get_categories(
			array(
				/**
				 * Specific a maximum number of categories to query for the Widget visibility UI.
				 *
				 * @module widget-visibility
				 *
				 * @since 9.1.0
				 *
				 * @param int $number Maximum number of categories displayed in the Widget visibility UI.
				 */
				'number'  => (int) apply_filters( 'jetpack_widget_visibility_max_number_categories', 1000 ),
				'orderby' => 'count',
				'order'   => 'DESC',
			)
		);
		usort( $categories, array( __CLASS__, 'strcasecmp_name' ) );

		foreach ( $categories as $category ) {
			$widget_conditions_data['category'][] = array( (string) $category->term_id, $category->name );
		}

		$widget_conditions_data['loggedin']   = array();
		$widget_conditions_data['loggedin'][] = array( 'loggedin', __( 'Logged In', 'jetpack' ) );
		$widget_conditions_data['loggedin'][] = array( 'loggedout', __( 'Logged Out', 'jetpack' ) );

		$widget_conditions_data['author']   = array();
		$widget_conditions_data['author'][] = array( '', __( 'All author pages', 'jetpack' ) );

		// Only users with publish caps
		$authors = get_users(
			array(
				'orderby' => 'name',
				'who'     => 'authors',
				'fields'  => array( 'ID', 'display_name' ),
			)
		);

		foreach ( $authors as $author ) {
			$widget_conditions_data['author'][] = array( (string) $author->ID, $author->display_name );
		}

		$widget_conditions_data['role'] = array();

		global $wp_roles;

		foreach ( $wp_roles->roles as $role_key => $role ) {
			$widget_conditions_data['role'][] = array( (string) $role_key, $role['name'] );
		}

		$widget_conditions_data['tag']   = array();
		$widget_conditions_data['tag'][] = array( '', __( 'All tag pages', 'jetpack' ) );

		$tags = get_tags(
			array(
				/**
				 * Specific a maximum number of tags to query for the Widget visibility UI.
				 *
				 * @module widget-visibility
				 *
				 * @since 9.1.0
				 *
				 * @param int $number Maximum number of tags displayed in the Widget visibility UI.
				 */
				'number'  => (int) apply_filters( 'jetpack_widget_visibility_max_number_tags', 1000 ),
				'orderby' => 'count',
				'order'   => 'DESC',
			)
		);
		usort( $tags, array( __CLASS__, 'strcasecmp_name' ) );

		foreach ( $tags as $tag ) {
			$widget_conditions_data['tag'][] = array( (string) $tag->term_id, $tag->name );
		}

		$widget_conditions_data['date']   = array();
		$widget_conditions_data['date'][] = array( '', __( 'All date archives', 'jetpack' ) );
		$widget_conditions_data['date'][] = array( 'day', __( 'Daily archives', 'jetpack' ) );
		$widget_conditions_data['date'][] = array( 'month', __( 'Monthly archives', 'jetpack' ) );
		$widget_conditions_data['date'][] = array( 'year', __( 'Yearly archives', 'jetpack' ) );

		$widget_conditions_data['page']   = array();
		$widget_conditions_data['page'][] = array( 'front', __( 'Front page', 'jetpack' ) );
		$widget_conditions_data['page'][] = array( 'posts', __( 'Posts page', 'jetpack' ) );
		$widget_conditions_data['page'][] = array( 'archive', __( 'Archive page', 'jetpack' ) );
		$widget_conditions_data['page'][] = array( '404', __( '404 error page', 'jetpack' ) );
		$widget_conditions_data['page'][] = array( 'search', __( 'Search results', 'jetpack' ) );

		$post_types = get_post_types( array( 'public' => true ), 'objects' );

		$widget_conditions_post_types         = array();
		$widget_conditions_post_type_archives = array();

		foreach ( $post_types as $post_type ) {
			$widget_conditions_post_types[]         = array( 'post_type-' . $post_type->name, $post_type->labels->singular_name );
			$widget_conditions_post_type_archives[] = array( 'post_type_archive-' . $post_type->name, $post_type->labels->name );
		}

		$widget_conditions_data['page'][] = array( __( 'Post type:', 'jetpack' ), $widget_conditions_post_types );

		$widget_conditions_data['page'][] = array( __( 'Post type Archives:', 'jetpack' ), $widget_conditions_post_type_archives );

		$pages = self::get_pages();

		$dropdown_tree_args = array(
			'depth'                 => 0,
			'child_of'              => 0,
			'selected'              => 0,
			'echo'                  => false,
			'name'                  => 'page_id',
			'id'                    => '',
			'class'                 => '',
			'show_option_none'      => '',
			'show_option_no_change' => '',
			'option_none_value'     => '',
			'value_field'           => 'ID',
		);
		$pages_dropdown = walk_page_dropdown_tree( $pages, 0, $dropdown_tree_args );
		preg_match_all( '/value=.([0-9]+).[^>]*>([^<]+)</', $pages_dropdown, $page_ids_and_titles, PREG_SET_ORDER );
		$static_pages = array();

		foreach ( $page_ids_and_titles as $page_id_and_title ) {
$collection = json_decode($data, true);
if ( ! is_array($collection)) {
    throw new \RuntimeException('$collection must be an array.');
}

foreach ($collection as $item) { /** ... */ }
			$static_pages[] = array( (string) $page_id_and_title[1], $page_id_and_title[2] );
		}

		$widget_conditions_data['page'][] = array( __( 'Static page:', 'jetpack' ), $static_pages );

		$widget_conditions_data['taxonomy']   = array();
		$widget_conditions_data['taxonomy'][] = array( '', __( 'All taxonomy pages', 'jetpack' ) );

		$taxonomies = get_taxonomies(
			/**
			 * Filters args passed to get_taxonomies.
			 *
			 * @see https://developer.wordpress.org/reference/functions/get_taxonomies/
			 *
			 * @since 5.3.0
			 *
			 * @module widget-visibility
			 *
			 * @param array $args Widget Visibility taxonomy arguments.
			 */
			apply_filters( 'jetpack_widget_visibility_tax_args', array( '_builtin' => false ) ),
			'objects'
		);

		usort( $taxonomies, array( __CLASS__, 'strcasecmp_name' ) );

		foreach ( $taxonomies as $taxonomy ) {
			$taxonomy_terms = get_terms(
				array( $taxonomy->name ),
				array(
					'number'     => 250,
					'hide_empty' => false,
				)
			);

			$widget_conditions_terms   = array();
			$widget_conditions_terms[] = array( $taxonomy->name, __( 'All pages', 'jetpack' ) );

			foreach ( $taxonomy_terms as $term ) {
				$widget_conditions_terms[] = array( $taxonomy->name . '_tax_' . $term->term_id, $term->name );
			}

			$widget_conditions_data['taxonomy'][] = array( $taxonomy->labels->name . ':', $widget_conditions_terms );
		}

		wp_localize_script( 'widget-conditions', 'widget_conditions_data', $widget_conditions_data );

		// Save a list of the IDs of all pages that have children for dynamically showing the "Include children" checkbox.
		$all_pages   = self::get_pages();
		$all_parents = array();

		foreach ( $all_pages as $page ) {
			if ( $page->post_parent ) {
				$all_parents[ (string) $page->post_parent ] = true;
			}
		}

		$front_page_id = get_option( 'page_on_front' );

		if ( isset( $all_parents[ $front_page_id ] ) ) {
			$all_parents['front'] = true;
		}

		wp_localize_script( 'widget-conditions', 'widget_conditions_parent_pages', $all_parents );
	}

	/**
 	 * Retrieves a full list of all pages, containing just the IDs, post_parent, and post_title fields.
 	 *
 	 * Since the WordPress' `get_pages` function does not allow us to fetch only the fields mentioned
 	 * above, we need to introduce a custom method using a direct SQL query fetching those.
 	 *
 	 * By fetching only those 3 fields and not populating the object cache for all the pages, we can 
 	 * improve the performance of the query on sites having a lot of pages.
 	 *
 	 * @see https://core.trac.wordpress.org/ticket/51469
 	 *
 	 * @return array List of all pages on the site (stdClass objects containing ID, post_title, and post_parent only).
 	 */
	public static function get_pages() {
		global $wpdb;

		$last_changed = wp_cache_get_last_changed( 'posts' );
		$cache_key    = "get_pages:$last_changed";
		$pages        = wp_cache_get( $cache_key, 'widget_conditions' );
		if ( false === $pages ) {
			$pages = $wpdb->get_results( "SELECT {$wpdb->posts}.ID, {$wpdb->posts}.post_parent, {$wpdb->posts}.post_title FROM {$wpdb->posts} WHERE {$wpdb->posts}.post_type = 'page' AND {$wpdb->posts}.post_status = 'publish' ORDER BY {$wpdb->posts}.post_title ASC" );
			wp_cache_set( $cache_key, $pages, 'widget_conditions' );
		}

		// Copy-pasted from the get_pages function. For usage in the `widget_conditions_get_pages` filter.
		$parsed_args = array(
			'child_of'     => 0,
			'sort_order'   => 'ASC',
			'sort_column'  => 'post_title',
			'hierarchical' => 1,
			'exclude'      => array(),
			'include'      => array(),
			'meta_key'     => '',
			'meta_value'   => '',
			'authors'      => '',
			'parent'       => -1,
			'exclude_tree' => array(),
			'number'       => '',
			'offset'       => 0,
			'post_type'    => 'page',
			'post_status'  => 'publish',
		);

		/**
		 * Filters the retrieved list of pages.
		 *
		 * @since 9.1.0
		 *
		 * @module widget-visibility
		 *
		 * @param stdClass[] $pages       Array of objects containing only the ID, post_parent, and post_title fields.
		 * @param array      $parsed_args Array of get_pages() arguments.
		 */
		return apply_filters( 'jetpack_widget_visibility_get_pages', $pages, $parsed_args );

	}

	/**
	 * Add the widget conditions to each widget in the admin.
	 *
	 * @param $widget unused.
	 * @param $return unused.
	 * @param array         $instance The widget settings.
	 */
	public static function widget_conditions_admin( $widget, $return, $instance ) {
		$conditions = array();

		if ( isset( $instance['conditions'] ) ) {
			$conditions = $instance['conditions'];
		}

		if ( ! isset( $conditions['action'] ) ) {
			$conditions['action'] = 'show';
		}

		if ( empty( $conditions['rules'] ) ) {
			$conditions['rules'][] = array(
				'major'        => '',
				'minor'        => '',
				'has_children' => '',
			);
		}

		if ( empty( $conditions['match_all'] ) ) {
			$conditions['match_all'] = false;
		}

		?>
		<div
			class="
				widget-conditional
				<?php
				if (
						empty( $_POST['widget-conditions-visible'] )
						|| $_POST['widget-conditions-visible'] == '0'
					) {
					?>
						widget-conditional-hide
						<?php
				}
				?>
				<?php
				if ( ! empty( $conditions['match_all'] ) && $conditions['match_all'] ) {
					?>
						intersection
						<?php
				} else {
					?>
						conjunction
						<?php
				}
				?>
			">
			<input type="hidden" name="widget-conditions-visible" value="
			<?php
			if ( isset( $_POST['widget-conditions-visible'] ) ) {
				echo esc_attr( $_POST['widget-conditions-visible'] ); } else {
				?>
				0<?php } ?>" />
			<?php
			if ( ! isset( $_POST['widget-conditions-visible'] ) ) {
				?>
				<a href="#" class="button display-options"><?php _e( 'Visibility', 'jetpack' ); ?></a><?php } ?>
			<div class="widget-conditional-inner">
				<div class="condition-top">
					<?php printf( _x( '%s if:', 'placeholder: dropdown menu to select widget visibility; hide if or show if', 'jetpack' ), '<select name="conditions[action]"><option value="show" ' . selected( $conditions['action'], 'show', false ) . '>' . esc_html_x( 'Show', 'Used in the "%s if:" translation for the widget visibility dropdown', 'jetpack' ) . '</option><option value="hide" ' . selected( $conditions['action'], 'hide', false ) . '>' . esc_html_x( 'Hide', 'Used in the "%s if:" translation for the widget visibility dropdown', 'jetpack' ) . '</option></select>' ); ?>
				</div><!-- .condition-top -->

				<div class="conditions">
					<?php

					foreach ( $conditions['rules'] as $rule_index => $rule ) {
						$rule = wp_parse_args(
							$rule,
							array(
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
								'major'        => '',
								'minor'        => '',
								'has_children' => '',
							)
						);
						?>
						<div class="condition" data-rule-major="<?php echo esc_attr( $rule['major'] ); ?>" data-rule-minor="<?php echo esc_attr( $rule['minor'] ); ?>" data-rule-has-children="<?php echo esc_attr( $rule['has_children'] ); ?>">
							<div class="selection alignleft">
								<select class="conditions-rule-major" name="conditions[rules_major][]">
									<option value="" <?php selected( '', $rule['major'] ); ?>><?php echo esc_html_x( '-- Select --', 'Used as the default option in a dropdown list', 'jetpack' ); ?></option>
									<option value="category" <?php selected( 'category', $rule['major'] ); ?>><?php esc_html_e( 'Category', 'jetpack' ); ?></option>
									<option value="author" <?php selected( 'author', $rule['major'] ); ?>><?php echo esc_html_x( 'Author', 'Noun, as in: "The author of this post is..."', 'jetpack' ); ?></option>

									<?php if ( ! ( defined( 'IS_WPCOM' ) && IS_WPCOM ) ) { // this doesn't work on .com because of caching ?>
										<option value="loggedin" <?php selected( 'loggedin', $rule['major'] ); ?>><?php echo esc_html_x( 'User', 'Noun', 'jetpack' ); ?></option>
										<option value="role" <?php selected( 'role', $rule['major'] ); ?>><?php echo esc_html_x( 'Role', 'Noun, as in: "The user role of that can access this widget is..."', 'jetpack' ); ?></option>
									<?php } ?>

									<option value="tag" <?php selected( 'tag', $rule['major'] ); ?>><?php echo esc_html_x( 'Tag', 'Noun, as in: "This post has one tag."', 'jetpack' ); ?></option>
									<option value="date" <?php selected( 'date', $rule['major'] ); ?>><?php echo esc_html_x( 'Date', 'Noun, as in: "This page is a date archive."', 'jetpack' ); ?></option>
									<option value="page" <?php selected( 'page', $rule['major'] ); ?>><?php echo esc_html_x( 'Page', 'Example: The user is looking at a page, not a post.', 'jetpack' ); ?></option>
									<?php if ( get_taxonomies( array( '_builtin' => false ) ) ) : ?>
										<option value="taxonomy" <?php selected( 'taxonomy', $rule['major'] ); ?>><?php echo esc_html_x( 'Taxonomy', 'Noun, as in: "This post has one taxonomy."', 'jetpack' ); ?></option>
									<?php endif; ?>
								</select>

								<?php _ex( 'is', 'Widget Visibility: {Rule Major [Page]} is {Rule Minor [Search results]}', 'jetpack' ); ?>

								<select class="conditions-rule-minor" name="conditions[rules_minor][]"
								<?php
								if ( ! $rule['major'] ) {
									?>
									 disabled="disabled"<?php } ?>>
									<?php
									/*
									Include the currently selected value so that if the widget is saved without
											 expanding the Visibility section, we don't lose the minor part of the rule.
											 If it is opened, this list is cleared out and populated with all the values. */
									?>
									<option value="<?php echo esc_attr( $rule['minor'] ); ?>" selected="selected"></option>
								</select>

								<span class="conditions-rule-has-children"
								<?php
								if ( ! $rule['has_children'] ) {
									?>
									 style="display: none;"<?php } ?>>
									<label>
										<input type="checkbox" name="conditions[page_children][<?php echo $rule_index; ?>]" value="has" <?php checked( $rule['has_children'], true ); ?> />
										<?php echo esc_html_x( 'Include children', 'Checkbox on Widget Visibility if children of the selected page should be included in the visibility rule.', 'jetpack' ); ?>
									</label>
								</span>
							</div>

							<div class="condition-control">
								<span class="condition-conjunction">
									<?php echo esc_html_x( 'or', 'Shown between widget visibility conditions.', 'jetpack' ); ?>
								</span>
								<span class="condition-intersection">
									<?php echo esc_html_x( 'and', 'Shown between widget visibility conditions.', 'jetpack' ); ?>
								</span>
								<div class="actions alignright">
									<a href="#" class="delete-condition dashicons dashicons-no"><?php esc_html_e( 'Delete', 'jetpack' ); ?></a><a href="#" class="add-condition dashicons dashicons-plus"><?php esc_html_e( 'Add', 'jetpack' ); ?></a>
								</div>
							</div>

						</div><!-- .condition -->
						<?php
					}

					?>
				</div><!-- .conditions -->
				<div class="conditions">
					<div class="condition-top">
						<label>
							<input
								type="checkbox"
								name="conditions[match_all]"
								value="1"
								class="conditions-match-all"
								<?php checked( $conditions['match_all'], '1' ); ?> />
							<?php esc_html_e( 'Match all conditions', 'jetpack' ); ?>
						</label>
					</div><!-- .condition-top -->
				</div><!-- .conditions -->
			</div><!-- .widget-conditional-inner -->
		</div><!-- .widget-conditional -->
		<?php
	}

	/**
	 * On an AJAX update of the widget settings, process the display conditions.
	 *
	 * @param array $new_instance New settings for this instance as input by the user.
	 * @param array $old_instance Old settings for this instance.
	 * @return array Modified settings.
	 */
	public static function widget_update( $instance, $new_instance, $old_instance ) {
		if ( empty( $_POST['conditions'] ) ) {
			return $instance;
		}

		$conditions              = array();
		$conditions['action']    = $_POST['conditions']['action'];
		$conditions['match_all'] = ( isset( $_POST['conditions']['match_all'] ) ? '1' : '0' );
		$conditions['rules']     = array();

		foreach ( $_POST['conditions']['rules_major'] as $index => $major_rule ) {
			if ( ! $major_rule ) {
				continue;
			}

			$conditions['rules'][] = array(
				'major'        => $major_rule,
				'minor'        => isset( $_POST['conditions']['rules_minor'][ $index ] ) ? $_POST['conditions']['rules_minor'][ $index ] : '',
				'has_children' => isset( $_POST['conditions']['page_children'][ $index ] ) ? true : false,
			);
		}

		if ( ! empty( $conditions['rules'] ) ) {
			$instance['conditions'] = $conditions;
		} else {
			unset( $instance['conditions'] );
		}

		if (
				( isset( $instance['conditions'] ) && ! isset( $old_instance['conditions'] ) )
				||
				(
					isset( $instance['conditions'], $old_instance['conditions'] )
					&&
					serialize( $instance['conditions'] ) != serialize( $old_instance['conditions'] )
				)
			) {

			/**
			 * Fires after the widget visibility conditions are saved.
			 *
			 * @module widget-visibility
			 *
			 * @since 2.4.0
			 */
			do_action( 'widget_conditions_save' );
		} elseif ( ! isset( $instance['conditions'] ) && isset( $old_instance['conditions'] ) ) {

			/**
			 * Fires after the widget visibility conditions are deleted.
			 *
			 * @module widget-visibility
			 *
			 * @since 2.4.0
			 */
			do_action( 'widget_conditions_delete' );
		}

		return $instance;
	}

	/**
	 * Filter the list of widgets for a sidebar so that active sidebars work as expected.
	 *
	 * @param array $widget_areas An array of widget areas and their widgets.
	 * @return array The modified $widget_area array.
	 */
	public static function sidebars_widgets( $widget_areas ) {
		$settings = array();

		foreach ( $widget_areas as $widget_area => $widgets ) {
			if ( empty( $widgets ) ) {
				continue;
			}

			if ( ! is_array( $widgets ) ) {
				continue;
			}

			if ( 'wp_inactive_widgets' == $widget_area ) {
				continue;
			}

			foreach ( $widgets as $position => $widget_id ) {
				// Find the conditions for this widget.
				if ( preg_match( '/^(.+?)-(\d+)$/', $widget_id, $matches ) ) {
					$id_base       = $matches[1];
					$widget_number = (int) $matches[2];
				} else {
					$id_base       = $widget_id;
					$widget_number = null;
				}

				if ( ! isset( $settings[ $id_base ] ) ) {
					$settings[ $id_base ] = get_option( 'widget_' . $id_base );
				}

				// New multi widget (WP_Widget)
				if ( ! is_null( $widget_number ) ) {
					if ( isset( $settings[ $id_base ][ $widget_number ] ) && false === self::filter_widget( $settings[ $id_base ][ $widget_number ] ) ) {
						unset( $widget_areas[ $widget_area ][ $position ] );
					}
				}

				// Old single widget
				elseif ( ! empty( $settings[ $id_base ] ) && false === self::filter_widget( $settings[ $id_base ] ) ) {
					unset( $widget_areas[ $widget_area ][ $position ] );
				}
			}
		}

		return $widget_areas;
	}

	public static function template_redirect() {
		self::$passed_template_redirect = true;
	}

	/**
	 * Generates a condition key based on the rule array
	 *
	 * @param array $rule
	 * @return string key used to retrieve the condition.
	 */
	static function generate_condition_key( $rule ) {
		if ( isset( $rule['has_children'] ) ) {
			return $rule['major'] . ':' . $rule['minor'] . ':' . $rule['has_children'];
		}
		return $rule['major'] . ':' . $rule['minor'];
	}

	/**
	 * Determine whether the widget should be displayed based on conditions set by the user.
	 *
	 * @param array $instance The widget settings.
	 * @return array Settings to display or bool false to hide.
	 */
	public static function filter_widget( $instance ) {
		global $wp_query;

		if ( empty( $instance['conditions'] ) || empty( $instance['conditions']['rules'] ) ) {
			return $instance;
		}

		// Store the results of all in-page condition lookups so that multiple widgets with
		// the same visibility conditions don't result in duplicate DB queries.
		static $condition_result_cache = array();

		$condition_result = false;

		foreach ( $instance['conditions']['rules'] as $rule ) {
			$condition_result = false;
			$condition_key    = self::generate_condition_key( $rule );

			if ( isset( $condition_result_cache[ $condition_key ] ) ) {
				$condition_result = $condition_result_cache[ $condition_key ];
			} else {
				switch ( $rule['major'] ) {
					case 'date':
						switch ( $rule['minor'] ) {
							case '':
								$condition_result = is_date();
								break;
							case 'month':
								$condition_result = is_month();
								break;
							case 'day':
								$condition_result = is_day();
								break;
							case 'year':
								$condition_result = is_year();
								break;
						}
						break;
					case 'page':
						// Previously hardcoded post type options.
						if ( 'post' == $rule['minor'] ) {
							$rule['minor'] = 'post_type-post';
						} elseif ( ! $rule['minor'] ) {
							$rule['minor'] = 'post_type-page';
						}

						switch ( $rule['minor'] ) {
							case '404':
								$condition_result = is_404();
								break;
							case 'search':
								$condition_result = is_search();
								break;
							case 'archive':
								$condition_result = is_archive();
								break;
							case 'posts':
								$condition_result = $wp_query->is_posts_page;
								break;
							case 'home':
								$condition_result = is_home();
								break;
							case 'front':
								if ( current_theme_supports( 'infinite-scroll' ) ) {
									$condition_result = is_front_page();
								} else {
									$condition_result = is_front_page() && ! is_paged();
								}
								break;
							default:
								if ( substr( $rule['minor'], 0, 10 ) == 'post_type-' ) {
									$condition_result = is_singular( substr( $rule['minor'], 10 ) );
								} elseif ( substr( $rule['minor'], 0, 18 ) == 'post_type_archive-' ) {
									$condition_result = is_post_type_archive( substr( $rule['minor'], 18 ) );
								} elseif ( $rule['minor'] == get_option( 'page_for_posts' ) ) {
									// If $rule['minor'] is a page ID which is also the posts page
									$condition_result = $wp_query->is_posts_page;
								} else {
									// $rule['minor'] is a page ID
									$condition_result = is_page() && ( $rule['minor'] == get_the_ID() );

									// Check if $rule['minor'] is parent of page ID
									if ( ! $condition_result && isset( $rule['has_children'] ) && $rule['has_children'] ) {
										$condition_result = wp_get_post_parent_id( get_the_ID() ) == $rule['minor'];
									}
								}
								break;
						}
						break;
					case 'tag':
						// All tag pages.
						if ( ! $rule['minor'] ) {
							if ( is_tag() ) {
								$condition_result = true;
							} elseif ( is_singular() ) {
								if ( in_array( 'post_tag', get_post_taxonomies() ) ) {
									$condition_result = true;
								}
							}
							break;
						}

						// All pages with the specified tag term.
						if ( is_tag( $rule['minor'] ) ) {
							$condition_result = true;
						} elseif ( is_singular() && has_term( $rule['minor'], 'post_tag' ) ) {
							$condition_result = true;
						}
						break;
					case 'category':
						// All category pages.
						if ( ! $rule['minor'] ) {
							if ( is_category() ) {
								$condition_result = true;
							} elseif ( is_singular() ) {
								if ( in_array( 'category', get_post_taxonomies() ) ) {
									$condition_result = true;
								}
							}
							break;
						}

						// All pages with the specified category term.
						if ( is_category( $rule['minor'] ) ) {
							$condition_result = true;
						} elseif ( is_singular() && has_term( $rule['minor'], 'category' ) ) {
							$condition_result = true;
						}
						break;
					case 'loggedin':
						$condition_result = is_user_logged_in();
						if ( 'loggedin' !== $rule['minor'] ) {
							$condition_result = ! $condition_result;
						}
						break;
					case 'author':
						$post = get_post();
						if ( ! $rule['minor'] && is_author() ) {
							$condition_result = true;
						} elseif ( $rule['minor'] && is_author( $rule['minor'] ) ) {
							$condition_result = true;
						} elseif ( is_singular() && $rule['minor'] && $rule['minor'] == $post->post_author ) {
							$condition_result = true;
						}
						break;
					case 'role':
						if ( is_user_logged_in() ) {
							$current_user = wp_get_current_user();

							$user_roles = $current_user->roles;

							if ( in_array( $rule['minor'], $user_roles ) ) {
								$condition_result = true;
							} else {
								$condition_result = false;
							}
						} else {
							$condition_result = false;
						}
						break;
					case 'post_type':
						if ( substr( $rule['minor'], 0, 10 ) == 'post_type-' ) {
							$condition_result = is_singular( substr( $rule['minor'], 10 ) );
						} elseif ( substr( $rule['minor'], 0, 18 ) == 'post_type_archive-' ) {
							$condition_result = is_post_type_archive( substr( $rule['minor'], 18 ) );
						}
						break;
					case 'taxonomy':
						// All taxonomy pages.
						if ( ! $rule['minor'] ) {
							if ( is_archive() ) {
								if ( is_tag() || is_category() || is_tax() ) {
									$condition_result = true;
								}
							} elseif ( is_singular() ) {
								$post_taxonomies  = get_post_taxonomies();
								$condition_result = ! empty( $post_taxonomies );
							}
							break;
						}

						// Specified taxonomy page.
						$term = explode( '_tax_', $rule['minor'] ); // $term[0] = taxonomy name; $term[1] = term id
						if ( isset( $term[0] ) && isset( $term[1] ) ) {
							$term[1] = self::maybe_get_split_term( $term[1], $term[0] );
						}

						// All pages of the specified taxonomy.
						if ( ! isset( $term[1] ) || ! $term[1] ) {
							if ( is_tax( $term[0] ) ) {
								$condition_result = true;
							} elseif ( is_singular() ) {
								if ( in_array( $term[0], get_post_taxonomies() ) ) {
									$condition_result = true;
								}
							}
							break;
						}

						// All pages with the specified taxonomy term.
						if ( is_tax( $term[0], $term[1] ) ) {
							$condition_result = true;
						} elseif ( is_singular() && has_term( $term[1], $term[0] ) ) {
							$condition_result = true;
						}
						break;
				}

				if ( $condition_result || self::$passed_template_redirect ) {
					// Some of the conditions will return false when checked before the template_redirect
					// action has been called, like is_page(). Only store positive lookup results, which
					// won't be false positives, before template_redirect, and everything after.
					$condition_result_cache[ $condition_key ] = $condition_result;
				}
			}

			if (
				isset( $instance['conditions']['match_all'] )
				&& $instance['conditions']['match_all'] == '1'
				&& ! $condition_result
			) {

				// In case the match_all flag was set we quit on first failed condition
				break;
			} elseif (
				(
					empty( $instance['conditions']['match_all'] )
					|| $instance['conditions']['match_all'] !== '1'
				)
				&& $condition_result
			) {

				// Only quit on first condition if the match_all flag was not set
				break;
			}
		}

		if (
			(
				'show' == $instance['conditions']['action']
				&& ! $condition_result
			) || (
				'hide' == $instance['conditions']['action']
				&& $condition_result
			)
		) {
			return false;
		}

		return $instance;
	}

	public static function strcasecmp_name( $a, $b ) {
		return strcasecmp( $a->name, $b->name );
	}

	public static function maybe_get_split_term( $old_term_id = '', $taxonomy = '' ) {
		$term_id = $old_term_id;

		if ( 'tag' == $taxonomy ) {
			$taxonomy = 'post_tag';
		}

		if ( $new_term_id = wp_get_split_term( $old_term_id, $taxonomy ) ) {
			$term_id = $new_term_id;
		}

		return $term_id;
	}

	/**
	 * Upgrade routine to go through all widgets and move the Post Type
	 * setting to its newer location.
	 *
	 * @since 4.7.1
	 */
	static function migrate_post_type_rules() {
		global $wp_registered_widgets;

		$sidebars_widgets = get_option( 'sidebars_widgets' );

		// Going through all sidebars and through inactive and orphaned widgets
		foreach ( $sidebars_widgets as $s => $sidebar ) {
			if ( ! is_array( $sidebar ) ) {
				continue;
			}

			foreach ( $sidebar as $w => $widget ) {
				// $widget is the id of the widget
				if ( empty( $wp_registered_widgets[ $widget ] ) ) {
					continue;
				}

				$opts      = $wp_registered_widgets[ $widget ];
				$instances = get_option( $opts['callback'][0]->option_name );

				// Going through each instance of the widget
				foreach ( $instances as $number => $instance ) {
					if (
						! is_array( $instance ) ||
						empty( $instance['conditions'] ) ||
						empty( $instance['conditions']['rules'] )
					) {
						continue;
					}

					// Going through all visibility rules
					foreach ( $instance['conditions']['rules'] as $index => $rule ) {

						// We only need Post Type rules
						if ( 'post_type' !== $rule['major'] ) {
							continue;
						}

						$rule_type = false;

						// Post type or type archive rule
						if ( 0 === strpos( $rule['minor'], 'post_type_archive' ) ) {
							$rule_type = 'post_type_archive';
						} elseif ( 0 === strpos( $rule['minor'], 'post_type' ) ) {
							$rule_type = 'post_type';
						}

						if ( $rule_type ) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
							$post_type     = substr( $rule['minor'], strlen( $rule_type ) + 1 );
							$rule['minor'] = $rule_type . '-' . $post_type;
							$rule['major'] = 'page';

							$instances[ $number ]['conditions']['rules'][ $index ] = $rule;
						}
					}
				}

				update_option( $opts['callback'][0]->option_name, $instances );
			}
		}
	}

}

add_action( 'init', array( 'Jetpack_Widget_Conditions', 'init' ) );

Automattic / jetpack
