<?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 tag (like %postname%).

 *

 * Warning: you must call this on init or earlier, otherwise the query var

 * addition stuff won't work.

 *

 * @since 2.1.0

 *

 * @param string $tagname

 * @param string $regex

 */

function add_rewrite_tag($tagname, $regex) {

	//validation

	if (strlen($tagname) < 3 || $tagname{0} != '%' || $tagname{strlen($tagname)-1} != '%') {

		return;

	}

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

	global $wp_rewrite, $wp;

	$wp->add_query_var($qv);

	$wp_rewrite->add_rewrite_tag($tagname, $regex, $qv . '=');

}

/**

 * 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;

}

/**

 * 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);

//pseudo-places

/**

 * Endpoint Mask for default, which is nothing.

 *

 * @since 2.1.0

 */

define('EP_NONE', 0);

/**

 * Endpoint Mask for everything.

 *

 * @since 2.1.0

 */

define('EP_ALL', 8191);

/**

 * Add an endpoint, like /trackback/.

 *

 * The endpoints are added to the end of the request. So a request matching

 * "/2008/10/14/my_post/myep/", the endpoint will be "/myep/".

 *

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

 * activated (register_activation_hook()) and deactivated (register_deactivation_hook())

 *

 * @since 2.1.0

 * @see WP_Rewrite::add_endpoint() Parameters and more description.

 * @uses $wp_rewrite

 *

 * @param unknown_type $name

 * @param unknown_type $places

 */

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

 * @author Mark Jaquith

 *

 * @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;

	// $url cleanup by Mark Jaquith

	// This fixes things like #anchors, ?query=strings, missing 'www.',

	// added 'www.', or added 'index.php/' that will mess up our WP_Query

	// and return a false negative

	// 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(get_option('home'), '://www.') && false === strpos($url, '://www.') )

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

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

	if ( false === strpos(get_option('home'), '://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, get_option('home')) ) {

		// Chop off http://domain.com

		$url = str_replace(get_option('home'), '', $url);

	} else {

		// Chop off /path/to/blog

		$home_path = parse_url(get_option('home'));

		$home_path = $home_path['path'];

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

	}

	// Trim leading and lagging slashes

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

	$request = $url;

	// Done with cleanup

	// Look for matches.

	$request_match = $request;

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

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

		// to the path info.

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

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

		}

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

			// 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 ( $query->is_single || $query->is_page )

				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 {

	/**

	 * Default permalink structure for WordPress.

	 *

	 * @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;

	/**

	 * Customized or default category permalink base ( example.com/xx/tagname ).

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $category_base;

	/**

	 * Customized or default tag permalink base ( example.com/xx/tagname ).

	 *

	 * @since 2.3.0

	 * @access private

	 * @var string

	 */

	var $tag_base;

	/**

	 * Permalink request structure for categories.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $category_structure;

	/**

	 * Permalink request structure for tags.

	 *

	 * @since 2.3.0

	 * @access private

	 * @var string

	 */

	var $tag_structure;

	/**

	 * Permalink author request base ( example.com/author/authorname ).

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $author_base = 'author';

	/**

	 * Permalink request structure for author pages.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $author_structure;

	/**

	 * Permalink request structure for dates.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $date_structure;

	/**

	 * Permalink request structure for pages.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $page_structure;

	/**

	 * Search permalink base ( example.com/search/query ).

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $search_base = 'search';

	/**

	 * Permalink request structure for searches.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $search_structure;

	/**

	 * Comments permalink base.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string

	 */

	var $comments_base = 'comments';

	/**

	 * Feed permalink base.

	 *

	 * @since 1.5.0

	 * @access private

	 * @var string