<?php

/**

 * WordPress Rewrite API

 *

 * @package WordPress

 * @subpackage Rewrite

 */

/**

 * Add a straight rewrite rule.

 *

 * @see WP_Rewrite::add_rule() for long description.

 * @since 2.1.0

 *

 * @param string $regex Regular Expression to match request against.

 * @param string $redirect Page to redirect to.

 * @param string $after Optional, default is 'bottom'. Where to add rule, can also be 'top'.

 */

function add_rewrite_rule($regex, $redirect, $after = 'bottom') {

	global $wp_rewrite;

	$wp_rewrite->add_rule($regex, $redirect, $after);

}

/**

 * Add a new rewrite tag (like %postname%).

 *

 * The $query parameter is optional. If it is omitted you must ensure that

 * you call this on, or before, the 'init' hook. This is because $query defaults

 * to "$tag=", and for this to work a new query var has to be added.

 *

 * @see WP_Rewrite::add_rewrite_tag()

 * @since 2.1.0

 *

 * @param string $tag Name of the new rewrite tag.

 * @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 '='. Optional.

 */

function add_rewrite_tag( $tag, $regex, $query = '' ) {

	// validate the tag's name

	if ( strlen( $tag ) < 3 || $tag[0] != '%' || $tag[ strlen($tag) - 1 ] != '%' )

		return;

	global $wp_rewrite, $wp;

	if ( empty( $query ) ) {

		$qv = trim( $tag, '%' );

		$wp->add_query_var( $qv );

		$query = $qv . '=';

	}

	$wp_rewrite->add_rewrite_tag( $tag, $regex, $query );

}

/**

 * Add permalink structure.

 *

 * @see WP_Rewrite::add_permastruct()

 * @since 3.0.0

 *

 * @param string $name Name for permalink structure.

 * @param string $struct Permalink structure.

 * @param array $args Optional configuration for building the rules from the permalink structure,

 *     see {@link WP_Rewrite::add_permastruct()} for full details.

 */

function add_permastruct( $name, $struct, $args = array() ) {

	global $wp_rewrite;

	// backwards compatibility 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 );

	return $wp_rewrite->add_permastruct( $name, $struct, $args );

}

/**

 * Add a new feed type like /atom1/.

 *

 * @since 2.1.0

 *

 * @param string $feedname

 * @param callback $function Callback to run on feed display.

 * @return string Feed action name.

 */

function add_feed($feedname, $function) {

	global $wp_rewrite;

	if ( ! in_array($feedname, $wp_rewrite->feeds) ) //override the file if it is

		$wp_rewrite->feeds[] = $feedname;

	$hook = 'do_feed_' . $feedname;

	// Remove default function hook

	remove_action($hook, $hook, 10, 1);

	add_action($hook, $function, 10, 1);

	return $hook;

}

/**

 * Remove rewrite rules and then recreate rewrite rules.

 *

 * @see WP_Rewrite::flush_rules()

 * @since 3.0.0

 *

 * @param bool $hard Whether to update .htaccess (hard flush) or just update

 * 	rewrite_rules transient (soft flush). Default is true (hard).

 */

function flush_rewrite_rules( $hard = true ) {

	global $wp_rewrite;

	$wp_rewrite->flush_rules( $hard );

}

/**

 * Endpoint Mask for default, which is nothing.

 *

 * @since 2.1.0

 */

define('EP_NONE', 0);

/**

 * Endpoint Mask for Permalink.

 *

 * @since 2.1.0

 */

define('EP_PERMALINK', 1);

/**

 * Endpoint Mask for Attachment.

 *

 * @since 2.1.0

 */

define('EP_ATTACHMENT', 2);

/**

 * Endpoint Mask for date.

 *

 * @since 2.1.0

 */

define('EP_DATE', 4);

/**

 * Endpoint Mask for year

 *

 * @since 2.1.0

 */

define('EP_YEAR', 8);

/**

 * Endpoint Mask for month.

 *

 * @since 2.1.0

 */

define('EP_MONTH', 16);

/**

 * Endpoint Mask for day.

 *

 * @since 2.1.0

 */

define('EP_DAY', 32);

/**

 * Endpoint Mask for root.

 *

 * @since 2.1.0

 */

define('EP_ROOT', 64);

/**

 * Endpoint Mask for comments.

 *

 * @since 2.1.0

 */

define('EP_COMMENTS', 128);

/**

 * Endpoint Mask for searches.

 *

 * @since 2.1.0

 */

define('EP_SEARCH', 256);

/**

 * Endpoint Mask for categories.

 *

 * @since 2.1.0

 */

define('EP_CATEGORIES', 512);

/**

 * Endpoint Mask for tags.

 *

 * @since 2.3.0

 */

define('EP_TAGS', 1024);

/**

 * Endpoint Mask for authors.

 *

 * @since 2.1.0

 */

define('EP_AUTHORS', 2048);

/**

 * Endpoint Mask for pages.

 *

 * @since 2.1.0

 */

define('EP_PAGES', 4096);

/**

 * Endpoint Mask for everything.

 *

 * @since 2.1.0

 */

define('EP_ALL', 8191);

/**

 * Add an endpoint, like /trackback/.

 *

 * Adding an endpoint creates extra rewrite rules for each of the matching

 * places specified by the provided bitmask. For example:

 *

 * <code>

 * add_rewrite_endpoint( 'json', EP_PERMALINK | EP_PAGES );

 * </code>

 *

 * will add a new rewrite rule ending with "json(/(.*))?/?$" for every permastruct

 * that describes a permalink (post) or page. This is rewritten to "json=$match"

 * where $match is the part of the URL matched by the endpoint regex (e.g. "foo" in

 * "<permalink>/json/foo/").

 *

 * A new query var with the same name as the endpoint will also be created.

 *

 * When specifying $places ensure that you are using the EP_* constants (or a

 * combination of them using the bitwise OR operator) as their values are not

 * guaranteed to remain static (especially EP_ALL).

 *

 * Be sure to flush the rewrite rules - flush_rewrite_rules() - when your plugin gets

 * activated and deactivated.

 *

 * @since 2.1.0

 * @see WP_Rewrite::add_endpoint()

 * @global object $wp_rewrite

 *

 * @param string $name Name of the endpoint.

 * @param int $places Endpoint mask describing the places the endpoint should be added.

 */

function add_rewrite_endpoint( $name, $places ) {

	global $wp_rewrite;

	$wp_rewrite->add_endpoint( $name, $places );

}

/**

 * Filter the URL base for taxonomies.

 *

 * To remove any manually prepended /index.php/.

 *

 * @access private

 * @since 2.6.0

 *

 * @param string $base The taxonomy base that we're going to filter

 * @return string

 */

function _wp_filter_taxonomy_base( $base ) {

	if ( !empty( $base ) ) {

		$base = preg_replace( '|^/index\.php/|', '', $base );

		$base = trim( $base, '/' );

	}

	return $base;

}

/**

 * Examine a url and try to determine the post ID it represents.

 *

 * Checks are supposedly from the hosted site blog.

 *

 * @since 1.0.0

 *

 * @param string $url Permalink to check.

 * @return int Post ID, or 0 on failure.

 */

function url_to_postid($url) {

	global $wp_rewrite;

	$url = apply_filters('url_to_postid', $url);

	// First, check to see if there is a 'p=N' or 'page_id=N' to match against

	if ( preg_match('#[?&](p|page_id|attachment_id)=(\d+)#', $url, $values) )	{

		$id = absint($values[2]);

		if ( $id )

			return $id;

	}

	// Check to see if we are using rewrite rules

	$rewrite = $wp_rewrite->wp_rewrite_rules();

	// Not using rewrite rules, and 'p=N' and 'page_id=N' methods failed, so we're out of options

	if ( empty($rewrite) )

		return 0;

	// Get rid of the #anchor

	$url_split = explode('#', $url);

	$url = $url_split[0];

	// Get rid of URL ?query=string

	$url_split = explode('?', $url);

	$url = $url_split[0];

	// Add 'www.' if it is absent and should be there

	if ( false !== strpos(home_url(), '://www.') && false === strpos($url, '://www.') )

		$url = str_replace('://', '://www.', $url);

	// Strip 'www.' if it is present and shouldn't be

	if ( false === strpos(home_url(), '://www.') )

		$url = str_replace('://www.', '://', $url);

	// Strip 'index.php/' if we're not using path info permalinks

	if ( !$wp_rewrite->using_index_permalinks() )

		$url = str_replace('index.php/', '', $url);

	if ( false !== strpos($url, home_url()) ) {

		// Chop off http://domain.com

		$url = str_replace(home_url(), '', $url);

	} else {

		// Chop off /path/to/blog

		$home_path = parse_url(home_url());

		$home_path = isset( $home_path['path'] ) ? $home_path['path'] : '' ;

		$url = str_replace($home_path, '', $url);

	}

	// Trim leading and lagging slashes

	$url = trim($url, '/');

	$request = $url;

	// Look for matches.

	$request_match = $request;

	foreach ( (array)$rewrite as $match => $query) {

		// If the requesting file is the anchor of the match, prepend it

		// to the path info.

		if ( !empty($url) && ($url != $request) && (strpos($match, $url) === 0) )

			$request_match = $url . '/' . $request;

		if ( preg_match("!^$match!", $request_match, $matches) ) {

			if ( $wp_rewrite->use_verbose_page_rules && preg_match( '/pagename=\$matches\[([0-9]+)\]/', $query, $varmatch ) ) {

				// this is a verbose page match, lets check to be sure about it

				if ( ! get_page_by_path( $matches[ $varmatch[1] ] ) )

					continue;

			}

			// Got a match.

			// Trim the query of everything up to the '?'.

			$query = preg_replace("!^.+\?!", '', $query);

			// Substitute the substring matches into the query.

			$query = addslashes(WP_MatchesMapRegex::apply($query, $matches));

			// Filter out non-public query vars

			global $wp;

			parse_str($query, $query_vars);

			$query = array();

			foreach ( (array) $query_vars as $key => $value ) {

				if ( in_array($key, $wp->public_query_vars) )

					$query[$key] = $value;

			}

			// Do the query

			$query = new WP_Query($query);

			if ( !empty($query->posts) && $query->is_singular )

				return $query->post->ID;

			else

				return 0;

		}

	}

	return 0;

}

/**

 * WordPress Rewrite Component.

 *

 * 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

 */

class WP_Rewrite {

	/**

	 * Permalink structure for posts.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $permalink_structure;

	/**

	 * Whether to add trailing slashes.

	 *

	 * @since 2.2.0

	 * @access private

	 * @var bool

	 */

	var $use_trailing_slashes;

	/**

	 * Base for the author permalink structure (example.com/$author_base/authorname).

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $author_base = 'author';

	/**

	 * Permalink structure for author archives.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $author_structure;

	/**

	 * Permalink structure for date archives.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $date_structure;

	/**

	 * Permalink structure for pages.

	 *

	 * @since 1.5.0