Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2021 insertions, 0 deletions

diff --git a/wp-includes/class-wp-rewrite.php b/wp-includes/class-wp-rewrite.php
new file mode 100644
index 0000000..8bcf8fc
--- /dev/null
+++ b/wp-includes/class-wp-rewrite.php
@@ -0,0 +1,2021 @@
+<?php
+/**
+ * Rewrite API: WP_Rewrite class
+ *
+ * @package WordPress
+ * @subpackage Rewrite
+ * @since 1.5.0
+ */
+
+/**
+ * Core class used to implement a rewrite component API.
+ *
+ * The WordPress Rewrite class writes the rewrite module rules to the .htaccess
+ * file. It also handles parsing the request to get the correct setup for the
+ * WordPress Query class.
+ *
+ * The Rewrite along with WP class function as a front controller for WordPress.
+ * You can add rules to trigger your page view and processing using this
+ * component. The full functionality of a front controller does not exist,
+ * meaning you can't define how the template files load based on the rewrite
+ * rules.
+ *
+ * @since 1.5.0
+ */
+#[AllowDynamicProperties]
+class WP_Rewrite {
+	/**
+	 * Permalink structure for posts.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $permalink_structure;
+
+	/**
+	 * Whether to add trailing slashes.
+	 *
+	 * @since 2.2.0
+	 * @var bool
+	 */
+	public $use_trailing_slashes;
+
+	/**
+	 * Base for the author permalink structure (example.com/$author_base/authorname).
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $author_base = 'author';
+
+	/**
+	 * Permalink structure for author archives.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $author_structure;
+
+	/**
+	 * Permalink structure for date archives.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $date_structure;
+
+	/**
+	 * Permalink structure for pages.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $page_structure;
+
+	/**
+	 * Base of the search permalink structure (example.com/$search_base/query).
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $search_base = 'search';
+
+	/**
+	 * Permalink structure for searches.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $search_structure;
+
+	/**
+	 * Comments permalink base.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $comments_base = 'comments';
+
+	/**
+	 * Pagination permalink base.
+	 *
+	 * @since 3.1.0
+	 * @var string
+	 */
+	public $pagination_base = 'page';
+
+	/**
+	 * Comments pagination permalink base.
+	 *
+	 * @since 4.2.0
+	 * @var string
+	 */
+	public $comments_pagination_base = 'comment-page';
+
+	/**
+	 * Feed permalink base.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $feed_base = 'feed';
+
+	/**
+	 * Comments feed permalink structure.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $comment_feed_structure;
+
+	/**
+	 * Feed request permalink structure.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $feed_structure;
+
+	/**
+	 * The static portion of the post permalink structure.
+	 *
+	 * If the permalink structure is "/archive/%post_id%" then the front
+	 * is "/archive/". If the permalink structure is "/%year%/%postname%/"
+	 * then the front is "/".
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 *
+	 * @see WP_Rewrite::init()
+	 */
+	public $front;
+
+	/**
+	 * The prefix for all permalink structures.
+	 *
+	 * If PATHINFO/index permalinks are in use then the root is the value of
+	 * `WP_Rewrite::$index` with a trailing slash appended. Otherwise the root
+	 * will be empty.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 *
+	 * @see WP_Rewrite::init()
+	 * @see WP_Rewrite::using_index_permalinks()
+	 */
+	public $root = '';
+
+	/**
+	 * The name of the index file which is the entry point to all requests.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $index = 'index.php';
+
+	/**
+	 * Variable name to use for regex matches in the rewritten query.
+	 *
+	 * @since 1.5.0
+	 * @var string
+	 */
+	public $matches = '';
+
+	/**
+	 * Rewrite rules to match against the request to find the redirect or query.
+	 *
+	 * @since 1.5.0
+	 * @var string[]
+	 */
+	public $rules;
+
+	/**
+	 * Additional rules added external to the rewrite class.
+	 *
+	 * Those not generated by the class, see add_rewrite_rule().
+	 *
+	 * @since 2.1.0
+	 * @var string[]
+	 */
+	public $extra_rules = array();
+
+	/**
+	 * Additional rules that belong at the beginning to match first.
+	 *
+	 * Those not generated by the class, see add_rewrite_rule().
+	 *
+	 * @since 2.3.0
+	 * @var string[]
+	 */
+	public $extra_rules_top = array();
+
+	/**
+	 * Rules that don't redirect to WordPress' index.php.
+	 *
+	 * These rules are written to the mod_rewrite portion of the .htaccess,
+	 * and are added by add_external_rule().
+	 *
+	 * @since 2.1.0
+	 * @var string[]
+	 */
+	public $non_wp_rules = array();
+
+	/**
+	 * Extra permalink structures, e.g. categories, added by add_permastruct().
+	 *
+	 * @since 2.1.0
+	 * @var array[]
+	 */
+	public $extra_permastructs = array();
+
+	/**
+	 * Endpoints (like /trackback/) added by add_rewrite_endpoint().
+	 *
+	 * @since 2.1.0
+	 * @var array[]
+	 */
+	public $endpoints;
+
+	/**
+	 * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
+	 *
+	 * This is off by default, turning it on might print a lot of rewrite rules
+	 * to the .htaccess file.
+	 *
+	 * @since 2.0.0
+	 * @var bool
+	 *
+	 * @see WP_Rewrite::mod_rewrite_rules()
+	 */
+	public $use_verbose_rules = false;
+
+	/**
+	 * Could post permalinks be confused with those of pages?
+	 *
+	 * If the first rewrite tag in the post permalink structure is one that could
+	 * also match a page name (e.g. %postname% or %author%) then this flag is
+	 * set to true. Prior to WordPress 3.3 this flag indicated that every page
+	 * would have a set of rules added to the top of the rewrite rules array.
+	 * Now it tells WP::parse_request() to check if a URL matching the page
+	 * permastruct is actually a page before accepting it.
+	 *
+	 * @since 2.5.0
+	 * @var bool
+	 *
+	 * @see WP_Rewrite::init()
+	 */
+	public $use_verbose_page_rules = true;
+
+	/**
+	 * Rewrite tags that can be used in permalink structures.
+	 *
+	 * These are translated into the regular expressions stored in
+	 * `WP_Rewrite::$rewritereplace` and are rewritten to the query
+	 * variables listed in WP_Rewrite::$queryreplace.
+	 *
+	 * Additional tags can be added with add_rewrite_tag().
+	 *
+	 * @since 1.5.0
+	 * @var string[]
+	 */
+	public $rewritecode = array(
+		'%year%',
+		'%monthnum%',
+		'%day%',
+		'%hour%',
+		'%minute%',
+		'%second%',
+		'%postname%',
+		'%post_id%',
+		'%author%',
+		'%pagename%',
+		'%search%',
+	);
+
+	/**
+	 * Regular expressions to be substituted into rewrite rules in place
+	 * of rewrite tags, see WP_Rewrite::$rewritecode.
+	 *
+	 * @since 1.5.0
+	 * @var string[]
+	 */
+	public $rewritereplace = array(
+		'([0-9]{4})',
+		'([0-9]{1,2})',
+		'([0-9]{1,2})',
+		'([0-9]{1,2})',
+		'([0-9]{1,2})',
+		'([0-9]{1,2})',
+		'([^/]+)',
+		'([0-9]+)',
+		'([^/]+)',
+		'([^/]+?)',
+		'(.+)',
+	);
+
+	/**
+	 * Query variables that rewrite tags map to, see WP_Rewrite::$rewritecode.
+	 *
+	 * @since 1.5.0
+	 * @var string[]
+	 */
+	public $queryreplace = array(
+		'year=',
+		'monthnum=',
+		'day=',
+		'hour=',
+		'minute=',
+		'second=',
+		'name=',
+		'p=',
+		'author_name=',
+		'pagename=',
+		's=',
+	);
+
+	/**
+	 * Supported default feeds.
+	 *
+	 * @since 1.5.0
+	 * @var string[]
+	 */
+	public $feeds = array( 'feed', 'rdf', 'rss', 'rss2', 'atom' );
+
+	/**
+	 * Determines whether permalinks are being used.
+	 *
+	 * This can be either rewrite module or permalink in the HTTP query string.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return bool True, if permalinks are enabled.
+	 */
+	public function using_permalinks() {
+		return ! empty( $this->permalink_structure );
+	}
+
+	/**
+	 * Determines whether permalinks are being used and rewrite module is not enabled.
+	 *
+	 * Means that permalink links are enabled and index.php is in the URL.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return bool Whether permalink links are enabled and index.php is in the URL.
+	 */
+	public function using_index_permalinks() {
+		if ( empty( $this->permalink_structure ) ) {
+			return false;
+		}
+
+		// If the index is not in the permalink, we're using mod_rewrite.
+		return preg_match( '#^/*' . $this->index . '#', $this->permalink_structure );
+	}
+
+	/**
+	 * Determines whether permalinks are being used and rewrite module is enabled.
+	 *
+	 * Using permalinks and index.php is not in the URL.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return bool Whether permalink links are enabled and index.php is NOT in the URL.
+	 */
+	public function using_mod_rewrite_permalinks() {
+		return $this->using_permalinks() && ! $this->using_index_permalinks();
+	}
+
+	/**
+	 * Indexes for matches for usage in preg_*() functions.
+	 *
+	 * The format of the string is, with empty matches property value, '$NUM'.
+	 * The 'NUM' will be replaced with the value in the $number parameter. With
+	 * the matches property not empty, the value of the returned string will
+	 * contain that value of the matches property. The format then will be
+	 * '$MATCHES[NUM]', with MATCHES as the value in the property and NUM the
+	 * value of the $number parameter.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param int $number Index number.
+	 * @return string
+	 */
+	public function preg_index( $number ) {
+		$match_prefix = '$';
+		$match_suffix = '';
+
+		if ( ! empty( $this->matches ) ) {
+			$match_prefix = '$' . $this->matches . '[';
+			$match_suffix = ']';
+		}
+
+		return "$match_prefix$number$match_suffix";
+	}
+
+	/**
+	 * Retrieves all pages and attachments for pages URIs.
+	 *
+	 * The attachments are for those that have pages as parents and will be
+	 * retrieved.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @global wpdb $wpdb WordPress database abstraction object.
+	 *
+	 * @return array Array of page URIs as first element and attachment URIs as second element.
+	 */
+	public function page_uri_index() {
+		global $wpdb;
+
+		// Get pages in order of hierarchy, i.e. children after parents.
+		$pages = $wpdb->get_results( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page' AND post_status != 'auto-draft'" );
+		$posts = get_page_hierarchy( $pages );
+
+		// If we have no pages get out quick.
+		if ( ! $posts ) {
+			return array( array(), array() );
+		}
+
+		// Now reverse it, because we need parents after children for rewrite rules to work properly.
+		$posts = array_reverse( $posts, true );
+
+		$page_uris            = array();
+		$page_attachment_uris = array();
+
+		foreach ( $posts as $id => $post ) {
+			// URL => page name.
+			$uri         = get_page_uri( $id );
+			$attachments = $wpdb->get_results( $wpdb->prepare( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = %d", $id ) );
+			if ( ! empty( $attachments ) ) {
+				foreach ( $attachments as $attachment ) {
+					$attach_uri                          = get_page_uri( $attachment->ID );
+					$page_attachment_uris[ $attach_uri ] = $attachment->ID;
+				}
+			}
+
+			$page_uris[ $uri ] = $id;
+		}
+
+		return array( $page_uris, $page_attachment_uris );
+	}
+
+	/**
+	 * Retrieves all of the rewrite rules for pages.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string[] Page rewrite rules.
+	 */
+	public function page_rewrite_rules() {
+		// The extra .? at the beginning prevents clashes with other regular expressions in the rules array.
+		$this->add_rewrite_tag( '%pagename%', '(.?.+?)', 'pagename=' );
+
+		return $this->generate_rewrite_rules( $this->get_page_permastruct(), EP_PAGES, true, true, false, false );
+	}
+
+	/**
+	 * Retrieves date permalink structure, with year, month, and day.
+	 *
+	 * The permalink structure for the date, if not set already depends on the
+	 * permalink structure. It can be one of three formats. The first is year,
+	 * month, day; the second is day, month, year; and the last format is month,
+	 * day, year. These are matched against the permalink structure for which
+	 * one is used. If none matches, then the default will be used, which is
+	 * year, month, day.
+	 *
+	 * Prevents post ID and date permalinks from overlapping. In the case of
+	 * post_id, the date permalink will be prepended with front permalink with
+	 * 'date/' before the actual permalink to form the complete date permalink
+	 * structure.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Date permalink structure on success, false on failure.
+	 */
+	public function get_date_permastruct() {
+		if ( isset( $this->date_structure ) ) {
+			return $this->date_structure;
+		}
+
+		if ( empty( $this->permalink_structure ) ) {
+			$this->date_structure = '';
+			return false;
+		}
+
+		// The date permalink must have year, month, and day separated by slashes.
+		$endians = array( '%year%/%monthnum%/%day%', '%day%/%monthnum%/%year%', '%monthnum%/%day%/%year%' );
+
+		$this->date_structure = '';
+		$date_endian          = '';
+
+		foreach ( $endians as $endian ) {
+			if ( str_contains( $this->permalink_structure, $endian ) ) {
+				$date_endian = $endian;
+				break;
+			}
+		}
+
+		if ( empty( $date_endian ) ) {
+			$date_endian = '%year%/%monthnum%/%day%';
+		}
+
+		/*
+		 * Do not allow the date tags and %post_id% to overlap in the permalink
+		 * structure. If they do, move the date tags to $front/date/.
+		 */
+		$front = $this->front;
+		preg_match_all( '/%.+?%/', $this->permalink_structure, $tokens );
+		$tok_index = 1;
+		foreach ( (array) $tokens[0] as $token ) {
+			if ( '%post_id%' === $token && ( $tok_index <= 3 ) ) {
+				$front = $front . 'date/';
+				break;
+			}
+			++$tok_index;
+		}
+
+		$this->date_structure = $front . $date_endian;
+
+		return $this->date_structure;
+	}
+
+	/**
+	 * Retrieves the year permalink structure without month and day.
+	 *
+	 * Gets the date permalink structure and strips out the month and day
+	 * permalink structures.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Year permalink structure on success, false on failure.
+	 */
+	public function get_year_permastruct() {
+		$structure = $this->get_date_permastruct();
+
+		if ( empty( $structure ) ) {
+			return false;
+		}
+
+		$structure = str_replace( '%monthnum%', '', $structure );
+		$structure = str_replace( '%day%', '', $structure );
+		$structure = preg_replace( '#/+#', '/', $structure );
+
+		return $structure;
+	}
+
+	/**
+	 * Retrieves the month permalink structure without day and with year.
+	 *
+	 * Gets the date permalink structure and strips out the day permalink
+	 * structures. Keeps the year permalink structure.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Year/Month permalink structure on success, false on failure.
+	 */
+	public function get_month_permastruct() {
+		$structure = $this->get_date_permastruct();
+
+		if ( empty( $structure ) ) {
+			return false;
+		}
+
+		$structure = str_replace( '%day%', '', $structure );
+		$structure = preg_replace( '#/+#', '/', $structure );
+
+		return $structure;
+	}
+
+	/**
+	 * Retrieves the day permalink structure with month and year.
+	 *
+	 * Keeps date permalink structure with all year, month, and day.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Year/Month/Day permalink structure on success, false on failure.
+	 */
+	public function get_day_permastruct() {
+		return $this->get_date_permastruct();
+	}
+
+	/**
+	 * Retrieves the permalink structure for categories.
+	 *
+	 * If the category_base property has no value, then the category structure
+	 * will have the front property value, followed by 'category', and finally
+	 * '%category%'. If it does, then the root property will be used, along with
+	 * the category_base property value.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Category permalink structure on success, false on failure.
+	 */
+	public function get_category_permastruct() {
+		return $this->get_extra_permastruct( 'category' );
+	}
+
+	/**
+	 * Retrieves the permalink structure for tags.
+	 *
+	 * If the tag_base property has no value, then the tag structure will have
+	 * the front property value, followed by 'tag', and finally '%tag%'. If it
+	 * does, then the root property will be used, along with the tag_base
+	 * property value.
+	 *
+	 * @since 2.3.0
+	 *
+	 * @return string|false Tag permalink structure on success, false on failure.
+	 */
+	public function get_tag_permastruct() {
+		return $this->get_extra_permastruct( 'post_tag' );
+	}
+
+	/**
+	 * Retrieves an extra permalink structure by name.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param string $name Permalink structure name.
+	 * @return string|false Permalink structure string on success, false on failure.
+	 */
+	public function get_extra_permastruct( $name ) {
+		if ( empty( $this->permalink_structure ) ) {
+			return false;
+		}
+
+		if ( isset( $this->extra_permastructs[ $name ] ) ) {
+			return $this->extra_permastructs[ $name ]['struct'];
+		}
+
+		return false;
+	}
+
+	/**
+	 * Retrieves the author permalink structure.
+	 *
+	 * The permalink structure is front property, author base, and finally
+	 * '/%author%'. Will set the author_structure property and then return it
+	 * without attempting to set the value again.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Author permalink structure on success, false on failure.
+	 */
+	public function get_author_permastruct() {
+		if ( isset( $this->author_structure ) ) {
+			return $this->author_structure;
+		}
+
+		if ( empty( $this->permalink_structure ) ) {
+			$this->author_structure = '';
+			return false;
+		}
+
+		$this->author_structure = $this->front . $this->author_base . '/%author%';
+
+		return $this->author_structure;
+	}
+
+	/**
+	 * Retrieves the search permalink structure.
+	 *
+	 * The permalink structure is root property, search base, and finally
+	 * '/%search%'. Will set the search_structure property and then return it
+	 * without attempting to set the value again.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Search permalink structure on success, false on failure.
+	 */
+	public function get_search_permastruct() {
+		if ( isset( $this->search_structure ) ) {
+			return $this->search_structure;
+		}
+
+		if ( empty( $this->permalink_structure ) ) {
+			$this->search_structure = '';
+			return false;
+		}
+
+		$this->search_structure = $this->root . $this->search_base . '/%search%';
+
+		return $this->search_structure;
+	}
+
+	/**
+	 * Retrieves the page permalink structure.
+	 *
+	 * The permalink structure is root property, and '%pagename%'. Will set the
+	 * page_structure property and then return it without attempting to set the
+	 * value again.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Page permalink structure on success, false on failure.
+	 */
+	public function get_page_permastruct() {
+		if ( isset( $this->page_structure ) ) {
+			return $this->page_structure;
+		}
+
+		if ( empty( $this->permalink_structure ) ) {
+			$this->page_structure = '';
+			return false;
+		}
+
+		$this->page_structure = $this->root . '%pagename%';
+
+		return $this->page_structure;
+	}
+
+	/**
+	 * Retrieves the feed permalink structure.
+	 *
+	 * The permalink structure is root property, feed base, and finally
+	 * '/%feed%'. Will set the feed_structure property and then return it
+	 * without attempting to set the value again.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Feed permalink structure on success, false on failure.
+	 */
+	public function get_feed_permastruct() {
+		if ( isset( $this->feed_structure ) ) {
+			return $this->feed_structure;
+		}
+
+		if ( empty( $this->permalink_structure ) ) {
+			$this->feed_structure = '';
+			return false;
+		}
+
+		$this->feed_structure = $this->root . $this->feed_base . '/%feed%';
+
+		return $this->feed_structure;
+	}
+
+	/**
+	 * Retrieves the comment feed permalink structure.
+	 *
+	 * The permalink structure is root property, comment base property, feed
+	 * base and finally '/%feed%'. Will set the comment_feed_structure property
+	 * and then return it without attempting to set the value again.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string|false Comment feed permalink structure on success, false on failure.
+	 */
+	public function get_comment_feed_permastruct() {
+		if ( isset( $this->comment_feed_structure ) ) {
+			return $this->comment_feed_structure;
+		}
+
+		if ( empty( $this->permalink_structure ) ) {
+			$this->comment_feed_structure = '';
+			return false;
+		}
+
+		$this->comment_feed_structure = $this->root . $this->comments_base . '/' . $this->feed_base . '/%feed%';
+
+		return $this->comment_feed_structure;
+	}
+
+	/**
+	 * Adds or updates existing rewrite tags (e.g. %postname%).
+	 *
+	 * If the tag already exists, replace the existing pattern and query for
+	 * that tag, otherwise add the new tag.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @see WP_Rewrite::$rewritecode
+	 * @see WP_Rewrite::$rewritereplace
+	 * @see WP_Rewrite::$queryreplace
+	 *
+	 * @param string $tag   Name of the rewrite tag to add or update.
+	 * @param string $regex Regular expression to substitute the tag for in rewrite rules.
+	 * @param string $query String to append to the rewritten query. Must end in '='.
+	 */
+	public function add_rewrite_tag( $tag, $regex, $query ) {
+		$position = array_search( $tag, $this->rewritecode, true );
+		if ( false !== $position && null !== $position ) {
+			$this->rewritereplace[ $position ] = $regex;
+			$this->queryreplace[ $position ]   = $query;
+		} else {
+			$this->rewritecode[]    = $tag;
+			$this->rewritereplace[] = $regex;
+			$this->queryreplace[]   = $query;
+		}
+	}
+
+
+	/**
+	 * Removes an existing rewrite tag.
+	 *
+	 * @since 4.5.0
+	 *
+	 * @see WP_Rewrite::$rewritecode
+	 * @see WP_Rewrite::$rewritereplace
+	 * @see WP_Rewrite::$queryreplace
+	 *
+	 * @param string $tag Name of the rewrite tag to remove.
+	 */
+	public function remove_rewrite_tag( $tag ) {
+		$position = array_search( $tag, $this->rewritecode, true );
+		if ( false !== $position && null !== $position ) {
+			unset( $this->rewritecode[ $position ] );
+			unset( $this->rewritereplace[ $position ] );
+			unset( $this->queryreplace[ $position ] );
+		}
+	}
+
+	/**
+	 * Generates rewrite rules from a permalink structure.
+	 *
+	 * The main WP_Rewrite function for building the rewrite rule list. The
+	 * contents of the function is a mix of black magic and regular expressions,
+	 * so best just ignore the contents and move to the parameters.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $permalink_structure The permalink structure.
+	 * @param int    $ep_mask             Optional. Endpoint mask defining what endpoints are added to the structure.
+	 *                                    Accepts a mask of:
+	 *                                    - `EP_ALL`
+	 *                                    - `EP_NONE`
+	 *                                    - `EP_ALL_ARCHIVES`
+	 *                                    - `EP_ATTACHMENT`
+	 *                                    - `EP_AUTHORS`
+	 *                                    - `EP_CATEGORIES`
+	 *                                    - `EP_COMMENTS`
+	 *                                    - `EP_DATE`
+	 *                                    - `EP_DAY`
+	 *                                    - `EP_MONTH`
+	 *                                    - `EP_PAGES`
+	 *                                    - `EP_PERMALINK`
+	 *                                    - `EP_ROOT`
+	 *                                    - `EP_SEARCH`
+	 *                                    - `EP_TAGS`
+	 *                                    - `EP_YEAR`
+	 *                                    Default `EP_NONE`.
+	 * @param bool   $paged               Optional. Whether archive pagination rules should be added for the structure.
+	 *                                    Default true.
+	 * @param bool   $feed                Optional. Whether feed rewrite rules should be added for the structure.
+	 *                                    Default true.
+	 * @param bool   $forcomments         Optional. Whether the feed rules should be a query for a comments feed.
+	 *                                    Default false.
+	 * @param bool   $walk_dirs           Optional. Whether the 'directories' making up the structure should be walked
+	 *                                    over and rewrite rules built for each in-turn. Default true.
+	 * @param bool   $endpoints           Optional. Whether endpoints should be applied to the generated rewrite rules.
+	 *                                    Default true.
+	 * @return string[] Array of rewrite rules keyed by their regex pattern.
+	 */
+	public function generate_rewrite_rules( $permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true ) {
+		// Build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
+		$feedregex2 = '';
+		foreach ( (array) $this->feeds as $feed_name ) {
+			$feedregex2 .= $feed_name . '|';
+		}
+		$feedregex2 = '(' . trim( $feedregex2, '|' ) . ')/?$';
+
+		/*
+		 * $feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom
+		 * and <permalink>/atom are both possible
+		 */
+		$feedregex = $this->feed_base . '/' . $feedregex2;
+
+		// Build a regex to match the trackback and page/xx parts of URLs.
+		$trackbackregex = 'trackback/?$';
+		$pageregex      = $this->pagination_base . '/?([0-9]{1,})/?$';
+		$commentregex   = $this->comments_pagination_base . '-([0-9]{1,})/?$';
+		$embedregex     = 'embed/?$';
+
+		// Build up an array of endpoint regexes to append => queries to append.
+		if ( $endpoints ) {
+			$ep_query_append = array();
+			foreach ( (array) $this->endpoints as $endpoint ) {
+				// Match everything after the endpoint name, but allow for nothing to appear there.
+				$epmatch = $endpoint[1] . '(/(.*))?/?$';
+
+				// This will be appended on to the rest of the query for each dir.
+				$epquery                     = '&' . $endpoint[2] . '=';
+				$ep_query_append[ $epmatch ] = array( $endpoint[0], $epquery );
+			}
+		}
+
+		// Get everything up to the first rewrite tag.
+		$front = substr( $permalink_structure, 0, strpos( $permalink_structure, '%' ) );
+
+		// Build an array of the tags (note that said array ends up being in $tokens[0]).
+		preg_match_all( '/%.+?%/', $permalink_structure, $tokens );
+
+		$num_tokens = count( $tokens[0] );
+
+		$index          = $this->index; // Probably 'index.php'.
+		$feedindex      = $index;
+		$trackbackindex = $index;
+		$embedindex     = $index;
+
+		/*
+		 * Build a list from the rewritecode and queryreplace arrays, that will look something
+		 * like tagname=$matches[i] where i is the current $i.
+		 */
+		$queries = array();
+		for ( $i = 0; $i < $num_tokens; ++$i ) {
+			if ( 0 < $i ) {
+				$queries[ $i ] = $queries[ $i - 1 ] . '&';
+			} else {
+				$queries[ $i ] = '';
+			}
+
+			$query_token    = str_replace( $this->rewritecode, $this->queryreplace, $tokens[0][ $i ] ) . $this->preg_index( $i + 1 );
+			$queries[ $i ] .= $query_token;
+		}
+
+		// Get the structure, minus any cruft (stuff that isn't tags) at the front.
+		$structure = $permalink_structure;
+		if ( '/' !== $front ) {
+			$structure = str_replace( $front, '', $structure );
+		}
+
+		/*
+		 * Create a list of dirs to walk over, making rewrite rules for each level
+		 * so for example, a $structure of /%year%/%monthnum%/%postname% would create
+		 * rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
+		 */
+		$structure = trim( $structure, '/' );
+		$dirs      = $walk_dirs ? explode( '/', $structure ) : array( $structure );
+		$num_dirs  = count( $dirs );
+
+		// Strip slashes from the front of $front.
+		$front = preg_replace( '|^/+|', '', $front );
+
+		// The main workhorse loop.
+		$post_rewrite = array();
+		$struct       = $front;
+		for ( $j = 0; $j < $num_dirs; ++$j ) {
+			// Get the struct for this dir, and trim slashes off the front.
+			$struct .= $dirs[ $j ] . '/'; // Accumulate. see comment near explode('/', $structure) above.
+			$struct  = ltrim( $struct, '/' );
+
+			// Replace tags with regexes.
+			$match = str_replace( $this->rewritecode, $this->rewritereplace, $struct );
+
+			// Make a list of tags, and store how many there are in $num_toks.
+			$num_toks = preg_match_all( '/%.+?%/', $struct, $toks );
+
+			// Get the 'tagname=$matches[i]'.
+			$query = ( ! empty( $num_toks ) && isset( $queries[ $num_toks - 1 ] ) ) ? $queries[ $num_toks - 1 ] : '';
+
+			// Set up $ep_mask_specific which is used to match more specific URL types.
+			switch ( $dirs[ $j ] ) {
+				case '%year%':
+					$ep_mask_specific = EP_YEAR;
+					break;
+				case '%monthnum%':
+					$ep_mask_specific = EP_MONTH;
+					break;
+				case '%day%':
+					$ep_mask_specific = EP_DAY;
+					break;
+				default:
+					$ep_mask_specific = EP_NONE;
+			}
+
+			// Create query for /page/xx.
+			$pagematch = $match . $pageregex;
+			$pagequery = $index . '?' . $query . '&paged=' . $this->preg_index( $num_toks + 1 );
+
+			// Create query for /comment-page-xx.
+			$commentmatch = $match . $commentregex;
+			$commentquery = $index . '?' . $query . '&cpage=' . $this->preg_index( $num_toks + 1 );
+
+			if ( get_option( 'page_on_front' ) ) {
+				// Create query for Root /comment-page-xx.
+				$rootcommentmatch = $match . $commentregex;
+				$rootcommentquery = $index . '?' . $query . '&page_id=' . get_option( 'page_on_front' ) . '&cpage=' . $this->preg_index( $num_toks + 1 );
+			}
+
+			// Create query for /feed/(feed|atom|rss|rss2|rdf).
+			$feedmatch = $match . $feedregex;
+			$feedquery = $feedindex . '?' . $query . '&feed=' . $this->preg_index( $num_toks + 1 );
+
+			// Create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex).
+			$feedmatch2 = $match . $feedregex2;
+			$feedquery2 = $feedindex . '?' . $query . '&feed=' . $this->preg_index( $num_toks + 1 );
+
+			// Create query and regex for embeds.
+			$embedmatch = $match . $embedregex;
+			$embedquery = $embedindex . '?' . $query . '&embed=true';
+
+			// If asked to, turn the feed queries into comment feed ones.
+			if ( $forcomments ) {
+				$feedquery  .= '&withcomments=1';
+				$feedquery2 .= '&withcomments=1';
+			}
+
+			// Start creating the array of rewrites for this dir.
+			$rewrite = array();
+
+			// ...adding on /feed/ regexes => queries.
+			if ( $feed ) {
+				$rewrite = array(
+					$feedmatch  => $feedquery,
+					$feedmatch2 => $feedquery2,
+					$embedmatch => $embedquery,
+				);
+			}
+
+			// ...and /page/xx ones.
+			if ( $paged ) {
+				$rewrite = array_merge( $rewrite, array( $pagematch => $pagequery ) );
+			}
+
+			// Only on pages with comments add ../comment-page-xx/.
+			if ( EP_PAGES & $ep_mask || EP_PERMALINK & $ep_mask ) {
+				$rewrite = array_merge( $rewrite, array( $commentmatch => $commentquery ) );
+			} elseif ( EP_ROOT & $ep_mask && get_option( 'page_on_front' ) ) {
+				$rewrite = array_merge( $rewrite, array( $rootcommentmatch => $rootcommentquery ) );
+			}
+
+			// Do endpoints.
+			if ( $endpoints ) {
+				foreach ( (array) $ep_query_append as $regex => $ep ) {
+					// Add the endpoints on if the mask fits.
+					if ( $ep[0] & $ep_mask || $ep[0] & $ep_mask_specific ) {
+						$rewrite[ $match . $regex ] = $index . '?' . $query . $ep[1] . $this->preg_index( $num_toks + 2 );
+					}
+				}
+			}
+
+			// If we've got some tags in this dir.
+			if ( $num_toks ) {
+				$post = false;
+				$page = false;
+
+				/*
+				 * Check to see if this dir is permalink-level: i.e. the structure specifies an
+				 * individual post. Do this by checking it contains at least one of 1) post name,
+				 * 2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
+				 * minute all present). Set these flags now as we need them for the endpoints.
+				 */
+				if ( str_contains( $struct, '%postname%' )
+					|| str_contains( $struct, '%post_id%' )
+					|| str_contains( $struct, '%pagename%' )
+					|| ( str_contains( $struct, '%year%' )
+						&& str_contains( $struct, '%monthnum%' )
+						&& str_contains( $struct, '%day%' )
+						&& str_contains( $struct, '%hour%' )
+						&& str_contains( $struct, '%minute%' )
+						&& str_contains( $struct, '%second%' ) )
+				) {
+					$post = true;
+					if ( str_contains( $struct, '%pagename%' ) ) {
+						$page = true;
+					}
+				}
+
+				if ( ! $post ) {
+					// For custom post types, we need to add on endpoints as well.
+					foreach ( get_post_types( array( '_builtin' => false ) ) as $ptype ) {
+						if ( str_contains( $struct, "%$ptype%" ) ) {
+							$post = true;
+
+							// This is for page style attachment URLs.
+							$page = is_post_type_hierarchical( $ptype );
+							break;
+						}
+					}
+				}
+
+				// If creating rules for a permalink, do all the endpoints like attachments etc.
+				if ( $post ) {
+					// Create query and regex for trackback.
+					$trackbackmatch = $match . $trackbackregex;
+					$trackbackquery = $trackbackindex . '?' . $query . '&tb=1';
+
+					// Create query and regex for embeds.
+					$embedmatch = $match . $embedregex;
+					$embedquery = $embedindex . '?' . $query . '&embed=true';
+
+					// Trim slashes from the end of the regex for this dir.
+					$match = rtrim( $match, '/' );
+
+					// Get rid of brackets.
+					$submatchbase = str_replace( array( '(', ')' ), '', $match );
+
+					// Add a rule for at attachments, which take the form of <permalink>/some-text.
+					$sub1 = $submatchbase . '/([^/]+)/';
+
+					// Add trackback regex <permalink>/trackback/...
+					$sub1tb = $sub1 . $trackbackregex;
+
+					// And <permalink>/feed/(atom|...)
+					$sub1feed = $sub1 . $feedregex;
+
+					// And <permalink>/(feed|atom...)
+					$sub1feed2 = $sub1 . $feedregex2;
+
+					// And <permalink>/comment-page-xx
+					$sub1comment = $sub1 . $commentregex;
+
+					// And <permalink>/embed/...
+					$sub1embed = $sub1 . $embedregex;
+
+					/*
+					 * Add another rule to match attachments in the explicit form:
+					 * <permalink>/attachment/some-text
+					 */
+					$sub2 = $submatchbase . '/attachment/([^/]+)/';
+
+					// And add trackbacks <permalink>/attachment/trackback.
+					$sub2tb = $sub2 . $trackbackregex;
+
+					// Feeds, <permalink>/attachment/feed/(atom|...)
+					$sub2feed = $sub2 . $feedregex;
+
+					// And feeds again on to this <permalink>/attachment/(feed|atom...)
+					$sub2feed2 = $sub2 . $feedregex2;
+
+					// And <permalink>/comment-page-xx
+					$sub2comment = $sub2 . $commentregex;
+
+					// And <permalink>/embed/...
+					$sub2embed = $sub2 . $embedregex;
+
+					// Create queries for these extra tag-ons we've just dealt with.
+					$subquery        = $index . '?attachment=' . $this->preg_index( 1 );
+					$subtbquery      = $subquery . '&tb=1';
+					$subfeedquery    = $subquery . '&feed=' . $this->preg_index( 2 );
+					$subcommentquery = $subquery . '&cpage=' . $this->preg_index( 2 );
+					$subembedquery   = $subquery . '&embed=true';
+
+					// Do endpoints for attachments.
+					if ( ! empty( $endpoints ) ) {
+						foreach ( (array) $ep_query_append as $regex => $ep ) {
+							if ( $ep[0] & EP_ATTACHMENT ) {
+								$rewrite[ $sub1 . $regex ] = $subquery . $ep[1] . $this->preg_index( 3 );
+								$rewrite[ $sub2 . $regex ] = $subquery . $ep[1] . $this->preg_index( 3 );
+							}
+						}
+					}
+
+					/*
+					 * Now we've finished with endpoints, finish off the $sub1 and $sub2 matches
+					 * add a ? as we don't have to match that last slash, and finally a $ so we
+					 * match to the end of the URL
+					 */
+					$sub1 .= '?$';
+					$sub2 .= '?$';
+
+					/*
+					 * Post pagination, e.g. <permalink>/2/
+					 * Previously: '(/[0-9]+)?/?$', which produced '/2' for page.
+					 * When cast to int, returned 0.
+					 */
+					$match = $match . '(?:/([0-9]+))?/?$';
+					$query = $index . '?' . $query . '&page=' . $this->preg_index( $num_toks + 1 );
+
+					// Not matching a permalink so this is a lot simpler.
+				} else {
+					// Close the match and finalize the query.
+					$match .= '?$';
+					$query  = $index . '?' . $query;
+				}
+
+				/*
+				 * Create the final array for this dir by joining the $rewrite array (which currently
+				 * only contains rules/queries for trackback, pages etc) to the main regex/query for
+				 * this dir
+				 */
+				$rewrite = array_merge( $rewrite, array( $match => $query ) );
+
+				// If we're matching a permalink, add those extras (attachments etc) on.
+				if ( $post ) {
+					// Add trackback.
+					$rewrite = array_merge( array( $trackbackmatch => $trackbackquery ), $rewrite );
+
+					// Add embed.
+					$rewrite = array_merge( array( $embedmatch => $embedquery ), $rewrite );
+
+					// Add regexes/queries for attachments, attachment trackbacks and so on.
+					if ( ! $page ) {
+						// Require <permalink>/attachment/stuff form for pages because of confusion with subpages.
+						$rewrite = array_merge(
+							$rewrite,
+							array(
+								$sub1        => $subquery,
+								$sub1tb      => $subtbquery,
+								$sub1feed    => $subfeedquery,
+								$sub1feed2   => $subfeedquery,
+								$sub1comment => $subcommentquery,
+								$sub1embed   => $subembedquery,
+							)
+						);
+					}
+
+					$rewrite = array_merge(
+						array(
+							$sub2        => $subquery,
+							$sub2tb      => $subtbquery,
+							$sub2feed    => $subfeedquery,
+							$sub2feed2   => $subfeedquery,
+							$sub2comment => $subcommentquery,
+							$sub2embed   => $subembedquery,
+						),
+						$rewrite
+					);
+				}
+			}
+			// Add the rules for this dir to the accumulating $post_rewrite.
+			$post_rewrite = array_merge( $rewrite, $post_rewrite );
+		}
+
+		// The finished rules. phew!
+		return $post_rewrite;
+	}
+
+	/**
+	 * Generates rewrite rules with permalink structure and walking directory only.
+	 *
+	 * Shorten version of WP_Rewrite::generate_rewrite_rules() that allows for shorter
+	 * list of parameters. See the method for longer description of what generating
+	 * rewrite rules does.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @see WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
+	 *
+	 * @param string $permalink_structure The permalink structure to generate rules.
+	 * @param bool   $walk_dirs           Optional. Whether to create list of directories to walk over.
+	 *                                    Default false.
+	 * @return array An array of rewrite rules keyed by their regex pattern.
+	 */
+	public function generate_rewrite_rule( $permalink_structure, $walk_dirs = false ) {
+		return $this->generate_rewrite_rules( $permalink_structure, EP_NONE, false, false, false, $walk_dirs );
+	}
+
+	/**
+	 * Constructs rewrite matches and queries from permalink structure.
+	 *
+	 * Runs the action {@see 'generate_rewrite_rules'} with the parameter that is an
+	 * reference to the current WP_Rewrite instance to further manipulate the
+	 * permalink structures and rewrite rules. Runs the {@see 'rewrite_rules_array'}
+	 * filter on the full rewrite rule array.
+	 *
+	 * There are two ways to manipulate the rewrite rules, one by hooking into
+	 * the {@see 'generate_rewrite_rules'} action and gaining full control of the
+	 * object or just manipulating the rewrite rule array before it is passed
+	 * from the function.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string[] An associative array of matches and queries.
+	 */
+	public function rewrite_rules() {
+		$rewrite = array();
+
+		if ( empty( $this->permalink_structure ) ) {
+			return $rewrite;
+		}
+
+		// robots.txt -- only if installed at the root.
+		$home_path      = parse_url( home_url() );
+		$robots_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'robots\.txt$' => $this->index . '?robots=1' ) : array();
+
+		// favicon.ico -- only if installed at the root.
+		$favicon_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'favicon\.ico$' => $this->index . '?favicon=1' ) : array();
+
+		// Old feed and service files.
+		$deprecated_files = array(
+			'.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
+			'.*wp-app\.php(/.*)?$' => $this->index . '?error=403',
+		);
+
+		// Registration rules.
+		$registration_pages = array();
+		if ( is_multisite() && is_main_site() ) {
+			$registration_pages['.*wp-signup.php$']   = $this->index . '?signup=true';
+			$registration_pages['.*wp-activate.php$'] = $this->index . '?activate=true';
+		}
+
+		// Deprecated.
+		$registration_pages['.*wp-register.php$'] = $this->index . '?register=true';
+
+		// Post rewrite rules.
+		$post_rewrite = $this->generate_rewrite_rules( $this->permalink_structure, EP_PERMALINK );
+
+		/**
+		 * Filters rewrite rules used for "post" archives.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $post_rewrite Array of rewrite rules for posts, keyed by their regex pattern.
+		 */
+		$post_rewrite = apply_filters( 'post_rewrite_rules', $post_rewrite );
+
+		// Date rewrite rules.
+		$date_rewrite = $this->generate_rewrite_rules( $this->get_date_permastruct(), EP_DATE );
+
+		/**
+		 * Filters rewrite rules used for date archives.
+		 *
+		 * Likely date archives would include `/yyyy/`, `/yyyy/mm/`, and `/yyyy/mm/dd/`.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $date_rewrite Array of rewrite rules for date archives, keyed by their regex pattern.
+		 */
+		$date_rewrite = apply_filters( 'date_rewrite_rules', $date_rewrite );
+
+		// Root-level rewrite rules.
+		$root_rewrite = $this->generate_rewrite_rules( $this->root . '/', EP_ROOT );
+
+		/**
+		 * Filters rewrite rules used for root-level archives.
+		 *
+		 * Likely root-level archives would include pagination rules for the homepage
+		 * as well as site-wide post feeds (e.g. `/feed/`, and `/feed/atom/`).
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $root_rewrite Array of root-level rewrite rules, keyed by their regex pattern.
+		 */
+		$root_rewrite = apply_filters( 'root_rewrite_rules', $root_rewrite );
+
+		// Comments rewrite rules.
+		$comments_rewrite = $this->generate_rewrite_rules( $this->root . $this->comments_base, EP_COMMENTS, false, true, true, false );
+
+		/**
+		 * Filters rewrite rules used for comment feed archives.
+		 *
+		 * Likely comments feed archives include `/comments/feed/` and `/comments/feed/atom/`.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $comments_rewrite Array of rewrite rules for the site-wide comments feeds, keyed by their regex pattern.
+		 */
+		$comments_rewrite = apply_filters( 'comments_rewrite_rules', $comments_rewrite );
+
+		// Search rewrite rules.
+		$search_structure = $this->get_search_permastruct();
+		$search_rewrite   = $this->generate_rewrite_rules( $search_structure, EP_SEARCH );
+
+		/**
+		 * Filters rewrite rules used for search archives.
+		 *
+		 * Likely search-related archives include `/search/search+query/` as well as
+		 * pagination and feed paths for a search.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $search_rewrite Array of rewrite rules for search queries, keyed by their regex pattern.
+		 */
+		$search_rewrite = apply_filters( 'search_rewrite_rules', $search_rewrite );
+
+		// Author rewrite rules.
+		$author_rewrite = $this->generate_rewrite_rules( $this->get_author_permastruct(), EP_AUTHORS );
+
+		/**
+		 * Filters rewrite rules used for author archives.
+		 *
+		 * Likely author archives would include `/author/author-name/`, as well as
+		 * pagination and feed paths for author archives.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $author_rewrite Array of rewrite rules for author archives, keyed by their regex pattern.
+		 */
+		$author_rewrite = apply_filters( 'author_rewrite_rules', $author_rewrite );
+
+		// Pages rewrite rules.
+		$page_rewrite = $this->page_rewrite_rules();
+
+		/**
+		 * Filters rewrite rules used for "page" post type archives.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $page_rewrite Array of rewrite rules for the "page" post type, keyed by their regex pattern.
+		 */
+		$page_rewrite = apply_filters( 'page_rewrite_rules', $page_rewrite );
+
+		// Extra permastructs.
+		foreach ( $this->extra_permastructs as $permastructname => $struct ) {
+			if ( is_array( $struct ) ) {
+				if ( count( $struct ) === 2 ) {
+					$rules = $this->generate_rewrite_rules( $struct[0], $struct[1] );
+				} else {
+					$rules = $this->generate_rewrite_rules( $struct['struct'], $struct['ep_mask'], $struct['paged'], $struct['feed'], $struct['forcomments'], $struct['walk_dirs'], $struct['endpoints'] );
+				}
+			} else {
+				$rules = $this->generate_rewrite_rules( $struct );
+			}
+
+			/**
+			 * Filters rewrite rules used for individual permastructs.
+			 *
+			 * The dynamic portion of the hook name, `$permastructname`, refers
+			 * to the name of the registered permastruct.
+			 *
+			 * Possible hook names include:
+			 *
+			 *  - `category_rewrite_rules`
+			 *  - `post_format_rewrite_rules`
+			 *  - `post_tag_rewrite_rules`
+			 *
+			 * @since 3.1.0
+			 *
+			 * @param string[] $rules Array of rewrite rules generated for the current permastruct, keyed by their regex pattern.
+			 */
+			$rules = apply_filters( "{$permastructname}_rewrite_rules", $rules );
+
+			if ( 'post_tag' === $permastructname ) {
+
+				/**
+				 * Filters rewrite rules used specifically for Tags.
+				 *
+				 * @since 2.3.0
+				 * @deprecated 3.1.0 Use {@see 'post_tag_rewrite_rules'} instead.
+				 *
+				 * @param string[] $rules Array of rewrite rules generated for tags, keyed by their regex pattern.
+				 */
+				$rules = apply_filters_deprecated( 'tag_rewrite_rules', array( $rules ), '3.1.0', 'post_tag_rewrite_rules' );
+			}
+
+			$this->extra_rules_top = array_merge( $this->extra_rules_top, $rules );
+		}
+
+		// Put them together.
+		if ( $this->use_verbose_page_rules ) {
+			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules );
+		} else {
+			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules );
+		}
+
+		/**
+		 * Fires after the rewrite rules are generated.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param WP_Rewrite $wp_rewrite Current WP_Rewrite instance (passed by reference).
+		 */
+		do_action_ref_array( 'generate_rewrite_rules', array( &$this ) );
+
+		/**
+		 * Filters the full set of generated rewrite rules.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string[] $rules The compiled array of rewrite rules, keyed by their regex pattern.
+		 */
+		$this->rules = apply_filters( 'rewrite_rules_array', $this->rules );
+
+		return $this->rules;
+	}
+
+	/**
+	 * Retrieves the rewrite rules.
+	 *
+	 * The difference between this method and WP_Rewrite::rewrite_rules() is that
+	 * this method stores the rewrite rules in the 'rewrite_rules' option and retrieves
+	 * it. This prevents having to process all of the permalinks to get the rewrite rules
+	 * in the form of caching.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string[] Array of rewrite rules keyed by their regex pattern.
+	 */
+	public function wp_rewrite_rules() {
+		$this->rules = get_option( 'rewrite_rules' );
+		if ( empty( $this->rules ) ) {
+			$this->refresh_rewrite_rules();
+		}
+
+		return $this->rules;
+	}
+
+	/**
+	 * Refreshes the rewrite rules, saving the fresh value to the database.
+	 * If the `wp_loaded` action has not occurred yet, will postpone saving to the database.
+	 *
+	 * @since 6.4.0
+	 */
+	private function refresh_rewrite_rules() {
+		$this->rules   = '';
+		$this->matches = 'matches';
+
+		$this->rewrite_rules();
+
+		if ( ! did_action( 'wp_loaded' ) ) {
+			/*
+			 * Is not safe to save the results right now, as the rules may be partial.
+			 * Need to give all rules the chance to register.
+			 */
+			add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
+		} else {
+			update_option( 'rewrite_rules', $this->rules );
+		}
+	}
+
+	/**
+	 * Retrieves mod_rewrite-formatted rewrite rules to write to .htaccess.
+	 *
+	 * Does not actually write to the .htaccess file, but creates the rules for
+	 * the process that will.
+	 *
+	 * Will add the non_wp_rules property rules to the .htaccess file before
+	 * the WordPress rewrite rules one.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @return string
+	 */
+	public function mod_rewrite_rules() {
+		if ( ! $this->using_permalinks() ) {
+			return '';
+		}
+
+		$site_root = parse_url( site_url() );
+		if ( isset( $site_root['path'] ) ) {
+			$site_root = trailingslashit( $site_root['path'] );
+		}
+
+		$home_root = parse_url( home_url() );
+		if ( isset( $home_root['path'] ) ) {
+			$home_root = trailingslashit( $home_root['path'] );
+		} else {
+			$home_root = '/';
+		}
+
+		$rules  = "<IfModule mod_rewrite.c>\n";
+		$rules .= "RewriteEngine On\n";
+		$rules .= "RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]\n";
+		$rules .= "RewriteBase $home_root\n";
+
+		// Prevent -f checks on index.php.
+		$rules .= "RewriteRule ^index\.php$ - [L]\n";
+
+		// Add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all).
+		foreach ( (array) $this->non_wp_rules as $match => $query ) {
+			// Apache 1.3 does not support the reluctant (non-greedy) modifier.
+			$match = str_replace( '.+?', '.+', $match );
+
+			$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
+		}
+
+		if ( $this->use_verbose_rules ) {
+			$this->matches = '';
+			$rewrite       = $this->rewrite_rules();
+			$num_rules     = count( $rewrite );
+			$rules        .= "RewriteCond %{REQUEST_FILENAME} -f [OR]\n" .
+				"RewriteCond %{REQUEST_FILENAME} -d\n" .
+				"RewriteRule ^.*$ - [S=$num_rules]\n";
+
+			foreach ( (array) $rewrite as $match => $query ) {
+				// Apache 1.3 does not support the reluctant (non-greedy) modifier.
+				$match = str_replace( '.+?', '.+', $match );
+
+				if ( str_contains( $query, $this->index ) ) {
+					$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
+				} else {
+					$rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA,L]\n";
+				}
+			}
+		} else {
+			$rules .= "RewriteCond %{REQUEST_FILENAME} !-f\n" .
+				"RewriteCond %{REQUEST_FILENAME} !-d\n" .
+				"RewriteRule . {$home_root}{$this->index} [L]\n";
+		}
+
+		$rules .= "</IfModule>\n";
+
+		/**
+		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
+		 *
+		 * @since 1.5.0
+		 *
+		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
+		 */
+		$rules = apply_filters( 'mod_rewrite_rules', $rules );
+
+		/**
+		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
+		 *
+		 * @since 1.5.0
+		 * @deprecated 1.5.0 Use the {@see 'mod_rewrite_rules'} filter instead.
+		 *
+		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
+		 */
+		return apply_filters_deprecated( 'rewrite_rules', array( $rules ), '1.5.0', 'mod_rewrite_rules' );
+	}
+
+	/**
+	 * Retrieves IIS7 URL Rewrite formatted rewrite rules to write to web.config file.
+	 *
+	 * Does not actually write to the web.config file, but creates the rules for
+	 * the process that will.
+	 *
+	 * @since 2.8.0
+	 *
+	 * @param bool $add_parent_tags Optional. Whether to add parent tags to the rewrite rule sets.
+	 *                              Default false.
+	 * @return string IIS7 URL rewrite rule sets.
+	 */
+	public function iis7_url_rewrite_rules( $add_parent_tags = false ) {
+		if ( ! $this->using_permalinks() ) {
+			return '';
+		}
+		$rules = '';
+		if ( $add_parent_tags ) {
+			$rules .= '<configuration>
+	<system.webServer>
+		<rewrite>
+			<rules>';
+		}
+
+		$rules .= '
+			<rule name="WordPress: ' . esc_attr( home_url() ) . '" patternSyntax="Wildcard">
+				<match url="*" />
+					<conditions>
+						<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
+						<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
+					</conditions>
+				<action type="Rewrite" url="index.php" />
+			</rule>';
+
+		if ( $add_parent_tags ) {
+			$rules .= '
+			</rules>
+		</rewrite>
+	</system.webServer>
+</configuration>';
+		}
+
+		/**
+		 * Filters the list of rewrite rules formatted for output to a web.config.
+		 *
+		 * @since 2.8.0
+		 *
+		 * @param string $rules Rewrite rules formatted for IIS web.config.
+		 */
+		return apply_filters( 'iis7_url_rewrite_rules', $rules );
+	}
+
+	/**
+	 * Adds a rewrite rule that transforms a URL structure to a set of query vars.
+	 *
+	 * Any value in the $after parameter that isn't 'bottom' will result in the rule
+	 * being placed at the top of the rewrite rules.
+	 *
+	 * @since 2.1.0
+	 * @since 4.4.0 Array support was added to the `$query` parameter.
+	 *
+	 * @param string       $regex Regular expression to match request against.
+	 * @param string|array $query The corresponding query vars for this rewrite rule.
+	 * @param string       $after Optional. Priority of the new rule. Accepts 'top'
+	 *                            or 'bottom'. Default 'bottom'.
+	 */
+	public function add_rule( $regex, $query, $after = 'bottom' ) {
+		if ( is_array( $query ) ) {
+			$external = false;
+			$query    = add_query_arg( $query, 'index.php' );
+		} else {
+			$index = ! str_contains( $query, '?' ) ? strlen( $query ) : strpos( $query, '?' );
+			$front = substr( $query, 0, $index );
+
+			$external = $front !== $this->index;
+		}
+
+		// "external" = it doesn't correspond to index.php.
+		if ( $external ) {
+			$this->add_external_rule( $regex, $query );
+		} else {
+			if ( 'bottom' === $after ) {
+				$this->extra_rules = array_merge( $this->extra_rules, array( $regex => $query ) );
+			} else {
+				$this->extra_rules_top = array_merge( $this->extra_rules_top, array( $regex => $query ) );
+			}
+		}
+	}
+
+	/**
+	 * Adds a rewrite rule that doesn't correspond to index.php.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string $regex Regular expression to match request against.
+	 * @param string $query The corresponding query vars for this rewrite rule.
+	 */
+	public function add_external_rule( $regex, $query ) {
+		$this->non_wp_rules[ $regex ] = $query;
+	}
+
+	/**
+	 * Adds an endpoint, like /trackback/.
+	 *
+	 * @since 2.1.0
+	 * @since 3.9.0 $query_var parameter added.
+	 * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
+	 *
+	 * @see add_rewrite_endpoint() for full documentation.
+	 * @global WP $wp Current WordPress environment instance.
+	 *
+	 * @param string      $name      Name of the endpoint.
+	 * @param int         $places    Endpoint mask describing the places the endpoint should be added.
+	 *                               Accepts a mask of:
+	 *                               - `EP_ALL`
+	 *                               - `EP_NONE`
+	 *                               - `EP_ALL_ARCHIVES`
+	 *                               - `EP_ATTACHMENT`
+	 *                               - `EP_AUTHORS`
+	 *                               - `EP_CATEGORIES`
+	 *                               - `EP_COMMENTS`
+	 *                               - `EP_DATE`
+	 *                               - `EP_DAY`
+	 *                               - `EP_MONTH`
+	 *                               - `EP_PAGES`
+	 *                               - `EP_PERMALINK`
+	 *                               - `EP_ROOT`
+	 *                               - `EP_SEARCH`
+	 *                               - `EP_TAGS`
+	 *                               - `EP_YEAR`
+	 * @param string|bool $query_var Optional. Name of the corresponding query variable. Pass `false` to
+	 *                               skip registering a query_var for this endpoint. Defaults to the
+	 *                               value of `$name`.
+	 */
+	public function add_endpoint( $name, $places, $query_var = true ) {
+		global $wp;
+
+		// For backward compatibility, if null has explicitly been passed as `$query_var`, assume `true`.
+		if ( true === $query_var || null === $query_var ) {
+			$query_var = $name;
+		}
+		$this->endpoints[] = array( $places, $name, $query_var );
+
+		if ( $query_var ) {
+			$wp->add_query_var( $query_var );
+		}
+	}
+
+	/**
+	 * Adds a new permalink structure.
+	 *
+	 * A permalink structure (permastruct) is an abstract definition of a set of rewrite rules;
+	 * it is an easy way of expressing a set of regular expressions that rewrite to a set of
+	 * query strings. The new permastruct is added to the WP_Rewrite::$extra_permastructs array.
+	 *
+	 * When the rewrite rules are built by WP_Rewrite::rewrite_rules(), all of these extra
+	 * permastructs are passed to WP_Rewrite::generate_rewrite_rules() which transforms them
+	 * into the regular expressions that many love to hate.
+	 *
+	 * The `$args` parameter gives you control over how WP_Rewrite::generate_rewrite_rules()
+	 * works on the new permastruct.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param string $name   Name for permalink structure.
+	 * @param string $struct Permalink structure (e.g. category/%category%)
+	 * @param array  $args   {
+	 *     Optional. Arguments for building rewrite rules based on the permalink structure.
+	 *     Default empty array.
+	 *
+	 *     @type bool $with_front  Whether the structure should be prepended with `WP_Rewrite::$front`.
+	 *                             Default true.
+	 *     @type int  $ep_mask     The endpoint mask defining which endpoints are added to the structure.
+	 *                             Accepts a mask of:
+	 *                             - `EP_ALL`
+	 *                             - `EP_NONE`
+	 *                             - `EP_ALL_ARCHIVES`
+	 *                             - `EP_ATTACHMENT`
+	 *                             - `EP_AUTHORS`
+	 *                             - `EP_CATEGORIES`
+	 *                             - `EP_COMMENTS`
+	 *                             - `EP_DATE`
+	 *                             - `EP_DAY`
+	 *                             - `EP_MONTH`
+	 *                             - `EP_PAGES`
+	 *                             - `EP_PERMALINK`
+	 *                             - `EP_ROOT`
+	 *                             - `EP_SEARCH`
+	 *                             - `EP_TAGS`
+	 *                             - `EP_YEAR`
+	 *                             Default `EP_NONE`.
+	 *     @type bool $paged       Whether archive pagination rules should be added for the structure.
+	 *                             Default true.
+	 *     @type bool $feed        Whether feed rewrite rules should be added for the structure. Default true.
+	 *     @type bool $forcomments Whether the feed rules should be a query for a comments feed. Default false.
+	 *     @type bool $walk_dirs   Whether the 'directories' making up the structure should be walked over
+	 *                             and rewrite rules built for each in-turn. Default true.
+	 *     @type bool $endpoints   Whether endpoints should be applied to the generated rules. Default true.
+	 * }
+	 */
+	public function add_permastruct( $name, $struct, $args = array() ) {
+		// Back-compat for the old parameters: $with_front and $ep_mask.
+		if ( ! is_array( $args ) ) {
+			$args = array( 'with_front' => $args );
+		}
+
+		if ( func_num_args() === 4 ) {
+			$args['ep_mask'] = func_get_arg( 3 );
+		}
+
+		$defaults = array(
+			'with_front'  => true,
+			'ep_mask'     => EP_NONE,
+			'paged'       => true,
+			'feed'        => true,
+			'forcomments' => false,
+			'walk_dirs'   => true,
+			'endpoints'   => true,
+		);
+
+		$args = array_intersect_key( $args, $defaults );
+		$args = wp_parse_args( $args, $defaults );
+
+		if ( $args['with_front'] ) {
+			$struct = $this->front . $struct;
+		} else {
+			$struct = $this->root . $struct;
+		}
+
+		$args['struct'] = $struct;
+
+		$this->extra_permastructs[ $name ] = $args;
+	}
+
+	/**
+	 * Removes a permalink structure.
+	 *
+	 * @since 4.5.0
+	 *
+	 * @param string $name Name for permalink structure.
+	 */
+	public function remove_permastruct( $name ) {
+		unset( $this->extra_permastructs[ $name ] );
+	}
+
+	/**
+	 * Removes rewrite rules and then recreate rewrite rules.
+	 *
+	 * Calls WP_Rewrite::wp_rewrite_rules() after removing the 'rewrite_rules' option.
+	 * If the function named 'save_mod_rewrite_rules' exists, it will be called.
+	 *
+	 * @since 2.0.1
+	 *
+	 * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
+	 */
+	public function flush_rules( $hard = true ) {
+		static $do_hard_later = null;
+
+		// Prevent this action from running before everyone has registered their rewrites.
+		if ( ! did_action( 'wp_loaded' ) ) {
+			add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
+			$do_hard_later = ( isset( $do_hard_later ) ) ? $do_hard_later || $hard : $hard;
+			return;
+		}
+
+		if ( isset( $do_hard_later ) ) {
+			$hard = $do_hard_later;
+			unset( $do_hard_later );
+		}
+
+		$this->refresh_rewrite_rules();
+
+		/**
+		 * Filters whether a "hard" rewrite rule flush should be performed when requested.
+		 *
+		 * A "hard" flush updates .htaccess (Apache) or web.config (IIS).
+		 *
+		 * @since 3.7.0
+		 *
+		 * @param bool $hard Whether to flush rewrite rules "hard". Default true.
+		 */
+		if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) ) {
+			return;
+		}
+		if ( function_exists( 'save_mod_rewrite_rules' ) ) {
+			save_mod_rewrite_rules();
+		}
+		if ( function_exists( 'iis7_save_url_rewrite_rules' ) ) {
+			iis7_save_url_rewrite_rules();
+		}
+	}
+
+	/**
+	 * Sets up the object's properties.
+	 *
+	 * The 'use_verbose_page_rules' object property will be set to true if the
+	 * permalink structure begins with one of the following: '%postname%', '%category%',
+	 * '%tag%', or '%author%'.
+	 *
+	 * @since 1.5.0
+	 */
+	public function init() {
+		$this->extra_rules         = array();
+		$this->non_wp_rules        = array();
+		$this->endpoints           = array();
+		$this->permalink_structure = get_option( 'permalink_structure' );
+		$this->front               = substr( $this->permalink_structure, 0, strpos( $this->permalink_structure, '%' ) );
+		$this->root                = '';
+
+		if ( $this->using_index_permalinks() ) {
+			$this->root = $this->index . '/';
+		}
+
+		unset( $this->author_structure );
+		unset( $this->date_structure );
+		unset( $this->page_structure );
+		unset( $this->search_structure );
+		unset( $this->feed_structure );
+		unset( $this->comment_feed_structure );
+
+		$this->use_trailing_slashes = str_ends_with( $this->permalink_structure, '/' );
+
+		// Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
+		if ( preg_match( '/^[^%]*%(?:postname|category|tag|author)%/', $this->permalink_structure ) ) {
+			$this->use_verbose_page_rules = true;
+		} else {
+			$this->use_verbose_page_rules = false;
+		}
+	}
+
+	/**
+	 * Sets the main permalink structure for the site.
+	 *
+	 * Will update the 'permalink_structure' option, if there is a difference
+	 * between the current permalink structure and the parameter value. Calls
+	 * WP_Rewrite::init() after the option is updated.
+	 *
+	 * Fires the {@see 'permalink_structure_changed'} action once the init call has
+	 * processed passing the old and new values
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $permalink_structure Permalink structure.
+	 */
+	public function set_permalink_structure( $permalink_structure ) {
+		if ( $this->permalink_structure !== $permalink_structure ) {
+			$old_permalink_structure = $this->permalink_structure;
+			update_option( 'permalink_structure', $permalink_structure );
+
+			$this->init();
+
+			/**
+			 * Fires after the permalink structure is updated.
+			 *
+			 * @since 2.8.0
+			 *
+			 * @param string $old_permalink_structure The previous permalink structure.
+			 * @param string $permalink_structure     The new permalink structure.
+			 */
+			do_action( 'permalink_structure_changed', $old_permalink_structure, $permalink_structure );
+		}
+	}
+
+	/**
+	 * Sets the category base for the category permalink.
+	 *
+	 * Will update the 'category_base' option, if there is a difference between
+	 * the current category base and the parameter value. Calls WP_Rewrite::init()
+	 * after the option is updated.
+	 *
+	 * @since 1.5.0
+	 *
+	 * @param string $category_base Category permalink structure base.
+	 */
+	public function set_category_base( $category_base ) {
+		if ( get_option( 'category_base' ) !== $category_base ) {
+			update_option( 'category_base', $category_base );
+			$this->init();
+		}
+	}
+
+	/**
+	 * Sets the tag base for the tag permalink.
+	 *
+	 * Will update the 'tag_base' option, if there is a difference between the
+	 * current tag base and the parameter value. Calls WP_Rewrite::init() after
+	 * the option is updated.
+	 *
+	 * @since 2.3.0
+	 *
+	 * @param string $tag_base Tag permalink structure base.
+	 */
+	public function set_tag_base( $tag_base ) {
+		if ( get_option( 'tag_base' ) !== $tag_base ) {
+			update_option( 'tag_base', $tag_base );
+			$this->init();
+		}
+	}
+
+	/**
+	 * Constructor - Calls init(), which runs setup.
+	 *
+	 * @since 1.5.0
+	 */
+	public function __construct() {
+		$this->init();
+	}
+}