/wp-includes/kses.php

<?php

/**

 * kses 0.2.2 - HTML/XHTML filter that only allows some elements and attributes

 * Copyright (C) 2002, 2003, 2005  Ulf Harnhammar

 *

 * This program is free software and open source software; you can redistribute

 * it and/or modify it under the terms of the GNU General Public License as

 * published by the Free Software Foundation; either version 2 of the License,

 * or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program; if not, write to the Free Software Foundation, Inc.,

 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA

 * http://www.gnu.org/licenses/gpl.html

 *

 * [kses strips evil scripts!]

 *

 * Added wp_ prefix to avoid conflicts with existing kses users

 *

 * @version 0.2.2

 * @copyright (C) 2002, 2003, 2005

 * @author Ulf Harnhammar <http://advogato.org/person/metaur/>

 *

 * @package External

 * @subpackage KSES

 *

 */



/**

 * You can override this in a plugin.

 *

 * The wp_kses_allowed_html filter is more powerful and supplies context.

 * CUSTOM_TAGS is not recommended and should be considered deprecated.

 *

 * @see wp_kses_allowed_html()

 *

 * @since 1.2.0

 */

if ( ! defined( 'CUSTOM_TAGS' ) )

	define( 'CUSTOM_TAGS', false );



// Ensure that these variables are added to the global namespace

// (e.g. if using namespaces / autoload in the current PHP environment).

global $allowedposttags, $allowedtags, $allowedentitynames;



if ( ! CUSTOM_TAGS ) {

	/**

	 * Kses global for default allowable HTML tags.

	 *

	 * Can be override by using CUSTOM_TAGS constant.

	 *

	 * @global array $allowedposttags

	 * @since 2.0.0

	 */

	$allowedposttags = array(

		'address' => array(),

		'a' => array(

			'href' => true,

			'rel' => true,

			'rev' => true,

			'name' => true,

			'target' => true,

		),

		'abbr' => array(),

		'acronym' => array(),

		'area' => array(

			'alt' => true,

			'coords' => true,

			'href' => true,

			'nohref' => true,

			'shape' => true,

			'target' => true,

		),

		'article' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'aside' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'b' => array(),

		'big' => array(),

		'blockquote' => array(

			'cite' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'br' => array(),

		'button' => array(

			'disabled' => true,

			'name' => true,

			'type' => true,

			'value' => true,

		),

		'caption' => array(

			'align' => true,

		),

		'cite' => array(

			'dir' => true,

			'lang' => true,

		),

		'code' => array(),

		'col' => array(

			'align' => true,

			'char' => true,

			'charoff' => true,

			'span' => true,

			'dir' => true,

			'valign' => true,

			'width' => true,

		),

		'del' => array(

			'datetime' => true,

		),

		'dd' => array(),

		'dfn' => array(),

		'details' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'open' => true,

			'xml:lang' => true,

		),

		'div' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'dl' => array(),

		'dt' => array(),

		'em' => array(),

		'fieldset' => array(),

		'figure' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'figcaption' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'font' => array(

			'color' => true,

			'face' => true,

			'size' => true,

		),

		'footer' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'form' => array(

			'action' => true,

			'accept' => true,

			'accept-charset' => true,

			'enctype' => true,

			'method' => true,

			'name' => true,

			'target' => true,

		),

		'h1' => array(

			'align' => true,

		),

		'h2' => array(

			'align' => true,

		),

		'h3' => array(

			'align' => true,

		),

		'h4' => array(

			'align' => true,

		),

		'h5' => array(

			'align' => true,

		),

		'h6' => array(

			'align' => true,

		),

		'header' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'hgroup' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'hr' => array(

			'align' => true,

			'noshade' => true,

			'size' => true,

			'width' => true,

		),

		'i' => array(),

		'img' => array(

			'alt' => true,

			'align' => true,

			'border' => true,

			'height' => true,

			'hspace' => true,

			'longdesc' => true,

			'vspace' => true,

			'src' => true,

			'usemap' => true,

			'width' => true,

		),

		'ins' => array(

			'datetime' => true,

			'cite' => true,

		),

		'kbd' => array(),

		'label' => array(

			'for' => true,

		),

		'legend' => array(

			'align' => true,

		),

		'li' => array(

			'align' => true,

			'value' => true,

		),

		'map' => array(

			'name' => true,

		),

		'mark' => array(),

		'menu' => array(

			'type' => true,

		),

		'nav' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'p' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'pre' => array(

			'width' => true,

		),

		'q' => array(

			'cite' => true,

		),

		's' => array(),

		'samp' => array(),

		'span' => array(

			'dir' => true,

			'align' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'section' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'small' => array(),

		'strike' => array(),

		'strong' => array(),

		'sub' => array(),

		'summary' => array(

			'align' => true,

			'dir' => true,

			'lang' => true,

			'xml:lang' => true,

		),

		'sup' => array(),

		'table' => array(

			'align' => true,

			'bgcolor' => true,

			'border' => true,

			'cellpadding' => true,

			'cellspacing' => true,

			'dir' => true,

			'rules' => true,

			'summary' => true,

			'width' => true,

		),

		'tbody' => array(

			'align' => true,

			'char' => true,

			'charoff' => true,

			'valign' => true,

		),

		'td' => array(

			'abbr' => true,

			'align' => true,

			'axis' => true,

			'bgcolor' => true,

			'char' => true,

			'charoff' => true,

			'colspan' => true,

			'dir' => true,

			'headers' => true,

			'height' => true,

			'nowrap' => true,

			'rowspan' => true,

			'scope' => true,

			'valign' => true,

			'width' => true,

		),

		'textarea' => array(

			'cols' => true,

			'rows' => true,

			'disabled' => true,

			'name' => true,

			'readonly' => true,

		),

		'tfoot' => array(

			'align' => true,

			'char' => true,

			'charoff' => true,

			'valign' => true,

		),

		'th' => array(

			'abbr' => true,

			'align' => true,

			'axis' => true,

			'bgcolor' => true,

			'char' => true,

			'charoff' => true,

			'colspan' => true,

			'headers' => true,

			'height' => true,

			'nowrap' => true,

			'rowspan' => true,

			'scope' => true,

			'valign' => true,

			'width' => true,

		),

		'thead' => array(

			'align' => true,

			'char' => true,

			'charoff' => true,

			'valign' => true,

		),

		'title' => array(),

		'tr' => array(

			'align' => true,

			'bgcolor' => true,

			'char' => true,

			'charoff' => true,

			'valign' => true,

		),

		'tt' => array(),

		'u' => array(),

		'ul' => array(

			'type' => true,

		),

		'ol' => array(

			'start' => true,

			'type' => true,

		),

		'var' => array(),

	);



	/**

	 * Kses allowed HTML elements.

	 *

	 * @global array $allowedtags

	 * @since 1.0.0

	 */

	$allowedtags = array(

		'a' => array(

			'href' => true,

			'title' => true,

		),

		'abbr' => array(

			'title' => true,

		),

		'acronym' => array(

			'title' => true,

		),

		'b' => array(),

		'blockquote' => array(

			'cite' => true,

		),

		'cite' => array(),

		'code' => array(),

		'del' => array(

			'datetime' => true,

		),

		'em' => array(),

		'i' => array(),

		'q' => array(

			'cite' => true,

		),

		'strike' => array(),

		'strong' => array(),

	);



	$allowedentitynames = array(

		'nbsp',    'iexcl',  'cent',    'pound',  'curren', 'yen',

		'brvbar',  'sect',   'uml',     'copy',   'ordf',   'laquo',

		'not',     'shy',    'reg',     'macr',   'deg',    'plusmn',

		'acute',   'micro',  'para',    'middot', 'cedil',  'ordm',

		'raquo',   'iquest', 'Agrave',  'Aacute', 'Acirc',  'Atilde',

		'Auml',    'Aring',  'AElig',   'Ccedil', 'Egrave', 'Eacute',

		'Ecirc',   'Euml',   'Igrave',  'Iacute', 'Icirc',  'Iuml',

		'ETH',     'Ntilde', 'Ograve',  'Oacute', 'Ocirc',  'Otilde',

		'Ouml',    'times',  'Oslash',  'Ugrave', 'Uacute', 'Ucirc',

		'Uuml',    'Yacute', 'THORN',   'szlig',  'agrave', 'aacute',

		'acirc',   'atilde', 'auml',    'aring',  'aelig',  'ccedil',

		'egrave',  'eacute', 'ecirc',   'euml',   'igrave', 'iacute',

		'icirc',   'iuml',   'eth',     'ntilde', 'ograve', 'oacute',

		'ocirc',   'otilde', 'ouml',    'divide', 'oslash', 'ugrave',

		'uacute',  'ucirc',  'uuml',    'yacute', 'thorn',  'yuml',

		'quot',    'amp',    'lt',      'gt',     'apos',   'OElig',

		'oelig',   'Scaron', 'scaron',  'Yuml',   'circ',   'tilde',

		'ensp',    'emsp',   'thinsp',  'zwnj',   'zwj',    'lrm',

		'rlm',     'ndash',  'mdash',   'lsquo',  'rsquo',  'sbquo',

		'ldquo',   'rdquo',  'bdquo',   'dagger', 'Dagger', 'permil',

		'lsaquo',  'rsaquo', 'euro',    'fnof',   'Alpha',  'Beta',

		'Gamma',   'Delta',  'Epsilon', 'Zeta',   'Eta',    'Theta',

		'Iota',    'Kappa',  'Lambda',  'Mu',     'Nu',     'Xi',

		'Omicron', 'Pi',     'Rho',     'Sigma',  'Tau',    'Upsilon',

		'Phi',     'Chi',    'Psi',     'Omega',  'alpha',  'beta',

		'gamma',   'delta',  'epsilon', 'zeta',   'eta',    'theta',

		'iota',    'kappa',  'lambda',  'mu',     'nu',     'xi',

		'omicron', 'pi',     'rho',     'sigmaf', 'sigma',  'tau',

		'upsilon', 'phi',    'chi',     'psi',    'omega',  'thetasym',

		'upsih',   'piv',    'bull',    'hellip', 'prime',  'Prime',

		'oline',   'frasl',  'weierp',  'image',  'real',   'trade',

		'alefsym', 'larr',   'uarr',    'rarr',   'darr',   'harr',

		'crarr',   'lArr',   'uArr',    'rArr',   'dArr',   'hArr',

		'forall',  'part',   'exist',   'empty',  'nabla',  'isin',

		'notin',   'ni',     'prod',    'sum',    'minus',  'lowast',

		'radic',   'prop',   'infin',   'ang',    'and',    'or',

		'cap',     'cup',    'int',     'sim',    'cong',   'asymp',

		'ne',      'equiv',  'le',      'ge',     'sub',    'sup',

		'nsub',    'sube',   'supe',    'oplus',  'otimes', 'perp',

		'sdot',    'lceil',  'rceil',   'lfloor', 'rfloor', 'lang',

		'rang',    'loz',    'spades',  'clubs',  'hearts', 'diams',

		'sup1',    'sup2',   'sup3',    'frac14', 'frac12', 'frac34',

		'there4',

	);



	$allowedposttags = array_map( '_wp_add_global_attributes', $allowedposttags );

} else {

	$allowedtags = wp_kses_array_lc( $allowedtags );

	$allowedposttags = wp_kses_array_lc( $allowedposttags );

}



/**

 * Filters content and keeps only allowable HTML elements.

 *

 * This function makes sure that only the allowed HTML element names, attribute

 * names and attribute values plus only sane HTML entities will occur in

 * $string. You have to remove any slashes from PHP's magic quotes before you

 * call this function.

 *

 * The default allowed protocols are 'http', 'https', 'ftp', 'mailto', 'news',

 * 'irc', 'gopher', 'nntp', 'feed', 'telnet, 'mms', 'rtsp' and 'svn'. This

 * covers all common link protocols, except for 'javascript' which should not

 * be allowed for untrusted users.

 *

 * @since 1.0.0

 *

 * @param string $string Content to filter through kses

 * @param array $allowed_html List of allowed HTML elements

 * @param array $allowed_protocols Optional. Allowed protocol in links.

 * @return string Filtered content with only allowed HTML elements

 */

function wp_kses( $string, $allowed_html, $allowed_protocols = array() ) {

	if ( empty( $allowed_protocols ) )

		$allowed_protocols = wp_allowed_protocols();

	$string = wp_kses_no_null($string);

	$string = wp_kses_js_entities($string);

	$string = wp_kses_normalize_entities($string);

	$string = wp_kses_hook($string, $allowed_html, $allowed_protocols); // WP changed the order of these funcs and added args to wp_kses_hook

	return wp_kses_split($string, $allowed_html, $allowed_protocols);

}



/**

 * Return a list of allowed tags and attributes for a given context.

 *

 * @since 3.5.0

 *

 * @param string $context The context for which to retrieve tags. Allowed values are

 *  post | strip | data | entities or the name of a field filter such as pre_user_description.

 * @return array List of allowed tags and their allowed attributes.

 */

function wp_kses_allowed_html( $context = '' ) {

	global $allowedposttags, $allowedtags, $allowedentitynames;



	if ( is_array( $context ) ) {

		/**

		 * Filter HTML elements allowed for a given context.

		 *

		 * @since 3.5.0

		 *

		 * @param string $tags    Allowed tags, attributes, and/or entities.

		 * @param string $context Context to judge allowed tags by. Allowed values are 'post',

		 *                        'data', 'strip', 'entities', 'explicit', or the name of a filter.

		 */

		return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' );

	}



	switch ( $context ) {

		case 'post':

			/** This filter is documented in wp-includes/kses.php */

			return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context );

			break;

		case 'user_description':

		case 'pre_user_description':

			$tags = $allowedtags;

			$tags['a']['rel'] = true;

			/** This filter is documented in wp-includes/kses.php */

			return apply_filters( 'wp_kses_allowed_html', $tags, $context );

			break;

		case 'strip':

			/** This filter is documented in wp-includes/kses.php */

			return apply_filters( 'wp_kses_allowed_html', array(), $context );

			break;

		case 'entities':

			/** This filter is documented in wp-includes/kses.php */

			return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context);

			break;

		case 'data':

		default:

			/** This filter is documented in wp-includes/kses.php */

			return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context );

	}

}



/**

 * You add any kses hooks here.

 *

 * There is currently only one kses WordPress hook and it is called here. All

 * parameters are passed to the hooks and expected to receive a string.

 *

 * @since 1.0.0

 *

 * @param string $string Content to filter through kses

 * @param array $allowed_html List of allowed HTML elements

 * @param array $allowed_protocols Allowed protocol in links

 * @return string Filtered content through 'pre_kses' hook

 */

function wp_kses_hook( $string, $allowed_html, $allowed_protocols ) {

	/**

	 * Filter content to be run through kses.

	 *

	 * @since 2.3.0

	 *

	 * @param string $string            Content to run through kses.

	 * @param array  $allowed_html      Allowed HTML elements.

	 * @param array  $allowed_protocols Allowed protocol in links.

	 */

	$string = apply_filters( 'pre_kses', $string, $allowed_html, $allowed_protocols );

	return $string;

}



/**

 * This function returns kses' version number.

 *

 * @since 1.0.0

 *

 * @return string KSES Version Number

 */

function wp_kses_version() {

	return '0.2.2';

}



/**

 * Searches for HTML tags, no matter how malformed.

 *

 * It also matches stray ">" characters.

 *

 * @since 1.0.0

 *

 * @param string $string Content to filter

 * @param array $allowed_html Allowed HTML elements

 * @param array $allowed_protocols Allowed protocols to keep

 * @return string Content with fixed HTML tags

 */

function wp_kses_split( $string, $allowed_html, $allowed_protocols ) {

	global $pass_allowed_html, $pass_allowed_protocols;

	$pass_allowed_html = $allowed_html;

	$pass_allowed_protocols = $allowed_protocols;

	return preg_replace_callback( '%(<!--.*?(-->|$))|(<[^>]*(>|$)|>)%', '_wp_kses_split_callback', $string );

}



/**

 * Callback for wp_kses_split.

 *

 * @since 3.1.0

 * @access private

 */

function _wp_kses_split_callback( $match ) {

	global $pass_allowed_html, $pass_allowed_protocols;

	return wp_kses_split2( $match[0], $pass_allowed_html, $pass_allowed_protocols );

}



/**

 * Callback for wp_kses_split for fixing malformed HTML tags.

 *

 * This function does a lot of work. It rejects some very malformed things like

 * <:::>. It returns an empty string, if the element isn't allowed (look ma, no

 * strip_tags()!). Otherwise it splits the tag into an element and an attribute

 * list.

 *

 * After the tag is split into an element and an attribute list, it is run

 * through another filter which will remove illegal attributes and once that is

 * completed, will be returned.

 *

 * @access private

 * @since 1.0.0

 * @uses wp_kses_attr()

 *

 * @param string $string Content to filter

 * @param array $allowed_html Allowed HTML elements

 * @param array $allowed_protocols Allowed protocols to keep

 * @return string Fixed HTML element

 */

function wp_kses_split2($string, $allowed_html, $allowed_protocols) {

	$string = wp_kses_stripslashes($string);



	if (substr($string, 0, 1) != '<')

		return '&gt;';

	# It matched a ">" character



	if ( '<!--' == substr( $string, 0, 4 ) ) {

		$string = str_replace( array('<!--', '-->'), '', $string );

		while ( $string != ($newstring = wp_kses($string, $allowed_html, $allowed_protocols)) )

			$string = $newstring;

		if ( $string == '' )

			return '';

		// prevent multiple dashes in comments

		$string = preg_replace('/--+/', '-', $string);

		// prevent three dashes closing a comment

		$string = preg_replace('/-$/', '', $string);

		return "<!--{$string}-->";

	}

	# Allow HTML comments



	if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?$%', $string, $matches))

		return '';

	# It's seriously malformed



	$slash = trim($matches[1]);

	$elem = $matches[2];

	$attrlist = $matches[3];



	if ( ! is_array( $allowed_html ) )

		$allowed_html = wp_kses_allowed_html( $allowed_html );



	if ( ! isset($allowed_html[strtolower($elem)]) )

		return '';

	# They are using a not allowed HTML element



	if ($slash != '')

		return "</$elem>";

	# No attributes are allowed for closing elements



	return wp_kses_attr( $elem, $attrlist, $allowed_html, $allowed_protocols );

}



/**

 * Removes all attributes, if none are allowed for this element.

 *

 * If some are allowed it calls wp_kses_hair() to split them further, and then

 * it builds up new HTML code from the data that kses_hair() returns. It also

 * removes "<" and ">" characters, if there are any left. One more thing it does

 * is to check if the tag has a closing XHTML slash, and if it does, it puts one

 * in the returned code as well.

 *

 * @since 1.0.0

 *

 * @param string $element HTML element/tag

 * @param string $attr HTML attributes from HTML element to closing HTML element tag

 * @param array $allowed_html Allowed HTML elements

 * @param array $allowed_protocols Allowed protocols to keep

 * @return string Sanitized HTML element

 */

function wp_kses_attr($element, $attr, $allowed_html, $allowed_protocols) {

	# Is there a closing XHTML slash at the end of the attributes?



	if ( ! is_array( $allowed_html ) )

		$allowed_html = wp_kses_allowed_html( $allowed_html );



	$xhtml_slash = '';

	if (preg_match('%\s*/\s*$%', $attr))

		$xhtml_slash = ' /';



	# Are any attributes allowed at all for this element?

	if ( ! isset($allowed_html[strtolower($element)]) || count($allowed_html[strtolower($element)]) == 0 )

		return "<$element$xhtml_slash>";



	# Split it

	$attrarr = wp_kses_hair($attr, $allowed_protocols);



	# Go through $attrarr, and save the allowed attributes for this element

	# in $attr2

	$attr2 = '';



	$allowed_attr = $allowed_html[strtolower($element)];

	foreach ($attrarr as $arreach) {

		if ( ! isset( $allowed_attr[strtolower($arreach['name'])] ) )

			continue; # the attribute is not allowed



		$current = $allowed_attr[strtolower($arreach['name'])];

		if ( $current == '' )

			continue; # the attribute is not allowed



		if ( strtolower( $arreach['name'] ) == 'style' ) {

			$orig_value = $arreach['value'];

			$value = safecss_filter_attr( $orig_value );



			if ( empty( $value ) )

				continue;



			$arreach['value'] = $value;

			$arreach['whole'] = str_replace( $orig_value, $value, $arreach['whole'] );

		}



		if ( ! is_array($current) ) {

			$attr2 .= ' '.$arreach['whole'];

		# there are no checks



		} else {

			# there are some checks

			$ok = true;

			foreach ($current as $currkey => $currval) {

				if ( ! wp_kses_check_attr_val($arreach['value'], $arreach['vless'], $currkey, $currval) ) {

					$ok = false;

					break;

				}

			}



			if ( $ok )

				$attr2 .= ' '.$arreach['whole']; # it passed them

		} # if !is_array($current)

	} # foreach



	# Remove any "<" or ">" characters

	$attr2 = preg_replace('/[<>]/', '', $attr2);



	return "<$element$attr2$xhtml_slash>";

}



/**

 * Builds an attribute list from string containing attributes.

 *

 * This function does a lot of work. It parses an attribute list into an array

 * with attribute data, and tries to do the right thing even if it gets weird

 * input. It will add quotes around attribute values that don't have any quotes

 * or apostrophes around them, to make it easier to produce HTML code that will

 * conform to W3C's HTML specification. It will also remove bad URL protocols

 * from attribute values. It also reduces duplicate attributes by using the

 * attribute defined first (foo='bar' foo='baz' will result in foo='bar').

 *

 * @since 1.0.0

 *

 * @param string $attr Attribute list from HTML element to closing HTML element tag

 * @param array $allowed_protocols Allowed protocols to keep

 * @return array List of attributes after parsing

 */

function wp_kses_hair($attr, $allowed_protocols) {

	$attrarr = array();

	$mode = 0;

	$attrname = '';

	$uris = array('xmlns', 'profile', 'href', 'src', 'cite', 'classid', 'codebase', 'data', 'usemap', 'longdesc', 'action');



	# Loop through the whole attribute list



	while (strlen($attr) != 0) {

		$working = 0; # Was the last operation successful?



		switch ($mode) {

			case 0 : # attribute name, href for instance



				if ( preg_match('/^([-a-zA-Z:]+)/', $attr, $match ) ) {

					$attrname = $match[1];

					$working = $mode = 1;

					$attr = preg_replace( '/^[-a-zA-Z:]+/', '', $attr );

				}



				break;



			case 1 : # equals sign or valueless ("selected")



				if (preg_match('/^\s*=\s*/', $attr)) # equals sign

					{

					$working = 1;

					$mode = 2;

					$attr = preg_replace('/^\s*=\s*/', '', $attr);

					break;

				}



				if (preg_match('/^\s+/', $attr)) # valueless

					{

					$working = 1;

					$mode = 0;

					if(false === array_key_exists($attrname, $attrarr)) {

						$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');

					}

					$attr = preg_replace('/^\s+/', '', $attr);

				}



				break;



			case 2 : # attribute value, a URL after href= for instance



				if (preg_match('%^"([^"]*)"(\s+|/?$)%', $attr, $match))

					# "value"

					{

					$thisval = $match[1];

					if ( in_array(strtolower($attrname), $uris) )

						$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);



					if(false === array_key_exists($attrname, $attrarr)) {

						$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');

					}

					$working = 1;

					$mode = 0;

					$attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);

					break;

				}



				if (preg_match("%^'([^']*)'(\s+|/?$)%", $attr, $match))

					# 'value'

					{

					$thisval = $match[1];

					if ( in_array(strtolower($attrname), $uris) )

						$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);



					if(false === array_key_exists($attrname, $attrarr)) {

						$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname='$thisval'", 'vless' => 'n');

					}

					$working = 1;

					$mode = 0;

					$attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);

					break;

				}



				if (preg_match("%^([^\s\"']+)(\s+|/?$)%", $attr, $match))

					# value

					{

					$thisval = $match[1];

					if ( in_array(strtolower($attrname), $uris) )

						$thisval = wp_kses_bad_protocol($thisval, $allowed_protocols);



					if(false === array_key_exists($attrname, $attrarr)) {

						$attrarr[$attrname] = array ('name' => $attrname, 'value' => $thisval, 'whole' => "$attrname=\"$thisval\"", 'vless' => 'n');

					}

					# We add quotes to conform to W3C's HTML spec.

					$working = 1;

					$mode = 0;

					$attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);

				}



				break;

		} # switch



		if ($working == 0) # not well formed, remove and try again

		{

			$attr = wp_kses_html_error($attr);

			$mode = 0;

		}

	} # while



	if ($mode == 1 && false === array_key_exists($attrname, $attrarr))

		# special case, for when the attribute list ends with a valueless

		# attribute like "selected"

		$attrarr[$attrname] = array ('name' => $attrname, 'value' => '', 'whole' => $attrname, 'vless' => 'y');



	return $attrarr;

}



/**

 * Performs different checks for attribute values.

 *

 * The currently implemented checks are "maxlen", "minlen", "maxval", "minval"

 * and "valueless".

 *

 * @since 1.0.0

 *

 * @param string $value Attribute value

 * @param string $vless Whether the value is valueless. Use 'y' or 'n'

 * @param string $checkname What $checkvalue is checking for.

 * @param mixed $checkvalue What constraint the value should pass

 * @return bool Whether check passes

 */

function wp_kses_check_attr_val($value, $vless, $checkname, $checkvalue) {

	$ok = true;



	switch (strtolower($checkname)) {

		case 'maxlen' :

			# The maxlen check makes sure that the attribute value has a length not

			# greater than the given value. This can be used to avoid Buffer Overflows

			# in WWW clients and various Internet servers.



			if (strlen($value) > $checkvalue)

				$ok = false;

			break;



		case 'minlen' :

			# The minlen check makes sure that the attribute value has a length not

			# smaller than the given value.



			if (strlen($value) < $checkvalue)

				$ok = false;

			break;



		case 'maxval' :

			# The maxval check does two things: it checks that the attribute value is

			# an integer from 0 and up, without an excessive amount of zeroes or

			# whitespace (to avoid Buffer Overflows). It also checks that the attribute

			# value is not greater than the given value.

			# This check can be used to avoid Denial of Service attacks.



			if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))

				$ok = false;

			if ($value > $checkvalue)

				$ok = false;

			break;



		case 'minval' :

			# The minval check makes sure that the attribute value is a positive integer,

			# and that it is not smaller than the given value.



			if (!preg_match('/^\s{0,6}[0-9]{1,6}\s{0,6}$/', $value))

				$ok = false;

			if ($value < $checkvalue)

				$ok = false;

			break;



		case 'valueless' :

			# The valueless check makes sure if the attribute has a value

			# (like <a href="blah">) or not (<option selected>). If the given value

			# is a "y" or a "Y", the attribute must not have a value.

			# If the given value is an "n" or an "N", the attribute must have one.



			if (strtolower($checkvalue) != $vless)

				$ok = false;

			break;

	} # switch



	return $ok;

}



/**

 * Sanitize string from bad protocols.

 *

 * This function removes all non-allowed protocols from the beginning of

 * $string. It ignores whitespace and the case of the letters, and it does

 * understand HTML entities. It does its work in a while loop, so it won't be

 * fooled by a string like "javascript:javascript:alert(57)".

 *

 * @since 1.0.0

 *

 * @param string $string Content to filter bad protocols from

 * @param array $allowed_protocols Allowed protocols to keep

 * @return string Filtered content

 */

function wp_kses_bad_protocol($string, $allowed_protocols) {

	$string = wp_kses_no_null($string);

	$iterations = 0;



	do {

		$original_string = $string;

		$string = wp_kses_bad_protocol_once($string, $allowed_protocols);

	} while ( $original_string != $string && ++$iterations < 6 );



	if ( $original_string != $string )

		return '';



	return $string;

}



/**

 * Removes any invalid control characters in $string.

 *

 * Also removes any instance of the '\0' string.

 *

 * @since 1.0.0

 *

 * @param string $string

 * @return string

 */

function wp_kses_no_null($string) {

	$string = preg_replace('/[\x00-\x08\x0B\x0C\x0E-\x1F]/', '', $string);

	$string = preg_replace('/(\\\\0)+/', '', $string);



	return $string;

}



/**

 * Strips slashes from in front of quotes.

 *

 * This function changes the character sequence \" to just ". It leaves all

 * other slashes alone. It's really weird, but the quoting from

 * preg_replace(//e) seems to require this.

 *

 * @since 1.0.0

 *

 * @param string $string String to strip slashes

 * @return string Fixed string with quoted slashes

 */

function wp_kses_stripslashes($string) {

	return preg_replace('%\\\\"%', '"', $string);

}



/**

 * Goes through an array and changes the keys to all lower case.

 *

 * @since 1.0.0

 *

 * @param array $inarray Unfiltered array

 * @return array Fixed array with all lowercase keys

 */

function wp_kses_array_lc($inarray) {

	$outarray = array ();



	foreach ( (array) $inarray as $inkey => $inval) {

		$outkey = strtolower($inkey);

		$outarray[$outkey] = array ();



		foreach ( (array) $inval as $inkey2 => $inval2) {

			$outkey2 = strtolower($inkey2);

			$outarray[$outkey][$outkey2] = $inval2;

		} # foreach $inval

	} # foreach $inarray



	return $outarray;

}



/**

 * Removes the HTML JavaScript entities found in early versions of Netscape 4.

 *

 * @since 1.0.0

 *

 * @param string $string

 * @return string

 */

function wp_kses_js_entities($string) {

	return preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);

}



/**

 * Handles parsing errors in wp_kses_hair().

 *

 * The general plan is to remove everything to and including some whitespace,

 * but it deals with quotes and apostrophes as well.

 *

 * @since 1.0.0

 *

 * @param string $string

 * @return string

 */

function wp_kses_html_error($string) {

	return preg_replace('/^("[^"]*("|$)|\'[^\']*(\'|$)|\S)*\s*/', '', $string);

}



/**

 * Sanitizes content from bad protocols and other characters.

 *

 * This function searches for URL protocols at the beginning of $string, while

 * handling whitespace and HTML entities.

 *

 * @since 1.0.0

 *

 * @param string $string Content to check for bad protocols

 * @param string $allowed_protocols Allowed protocols

 * @return string Sanitized content

 */

function wp_kses_bad_protocol_once($string, $allowed_protocols, $count = 1 ) {

	$string2 = preg_split( '/:|&#0*58;|&#x0*3a;/i', $string, 2 );

	if ( isset($string2[1]) && ! preg_match('%/\?%', $string2[0]) ) {

		$string = trim( $string2[1] );

		$protocol = wp_kses_bad_protocol_once2( $string2[0], $allowed_protocols );

		if ( 'feed:' == $protocol ) {

			if ( $count > 2 )

				return '';

			$string = wp_kses_bad_protocol_once( $string, $allowed_protocols, ++$count );

			if ( empty( $string ) )

				return $string;

		}

		$string = $protocol . $string;

	}



	return $string;

}



/**

 * Callback for wp_kses_bad_protocol_once() regular expression.

 *

 * This function processes URL protocols, checks to see if they're in the

 * whitelist or not, and returns different data depending on the answer.

 *

 * @access private

 * @since 1.0.0

 *

 * @param string $string URI scheme to check against the whitelist

 * @param string $allowed_protocols Allowed protocols

 * @return string Sanitized content

 */

function wp_kses_bad_protocol_once2( $string, $allowed_protocols ) {

	$string2 = wp_kses_decode_entities($string);

	$string2 = preg_replace('/\s/', '', $string2);

	$string2 = wp_kses_no_null($string2);

	$string2 = strtolower($string2);



	$allowed = false;

	foreach ( (array) $allowed_protocols as $one_protocol )

		if ( strtolower($one_protocol) == $string2 ) {

			$allowed = true;

			break;

		}



	if ($allowed)

		return "$string2:";

	else

		return '';

}



/**

 * Converts and fixes HTML entities.

 *

 * This function normalizes HTML entities. It will convert "AT&T" to the correct

 * "AT&amp;T", "&#00058;" to "&#58;", "&#XYZZY;" to "&amp;#XYZZY;" and so on.

 *

 * @since 1.0.0

 *

 * @param string $string Content to normalize entities

 * @return string Content with normalized entities

 */

function wp_kses_normalize_entities($string) {

	# Disarm all entities by converting & to &amp;



	$string = str_replace('&', '&amp;', $string);



	# Change back the allowed entities in our entity whitelist



	$string = preg_replace_callback('/&amp;([A-Za-z]{2,8}[0-9]{0,2});/', 'wp_kses_named_entities', $string);

	$string = preg_replace_callback('/&amp;#(0*[0-9]{1,7});/', 'wp_kses_normalize_entities2', $string);

	$string = preg_replace_callback('/&amp;#[Xx](0*[0-9A-Fa-f]{1,6});/', 'wp_kses_normalize_entities3', $string);



	return $string;

}



/**

 * Callback for wp_kses_normalize_entities() regular expression.

 *

 * This function only accepts valid named entity references, which are finite,

 * case-sensitive, and highly scrutinized by HTML and XML validators.

 *

 * @since 3.0.0

 *

 * @param array $matches preg_replace_callback() matches array

 * @return string Correctly encoded entity

 */

function wp_kses_named_entities($matches) {

	global $allowedentitynames;



	if ( empty($matches[1]) )

		return '';



	$i = $matches[1];

	return ( ( ! in_array($i, $allowedentitynames) ) ? "&amp;$i;" : "&$i;" );

}



/**

 * Callback for wp_kses_normalize_entities() regular expression.

 *

 * This function helps wp_kses_normalize_entities() to only accept 16-bit values

 * and nothing more for &#number; entities.

 *

 * @access private

 * @since 1.0.0

 *

 * @param array $matches preg_replace_callback() matches array

 * @return string Correctly encoded entity

 */

function wp_kses_normalize_entities2($matches) {

	if ( empty($matches[1]) )

		return '';



	$i = $matches[1];

	if (valid_unicode($i)) {

		$i = str_pad(ltrim($i,'0'), 3, '0', STR_PAD_LEFT);

		$i = "&#$i;";

	} else {

		$i = "&amp;#$i;";

	}



	return $i;

}



/**

 * Callback for wp_kses_normalize_entities() for regular expression.

 *

 * This function helps wp_kses_normalize_entities() to only accept valid Unicode

 * numeric entities in hex form.

 *

 * @access private

 *

 * @param array $matches preg_replace_callback() matches array

 * @return string Correctly encoded entity

 */

function wp_kses_normalize_entities3($matches) {

	if ( empty($matches[1]) )

		return '';



	$hexchars = $matches[1];

	return ( ( ! valid_unicode(hexdec($hexchars)) ) ? "&amp;#x$hexchars;" : '&#x'.ltrim($hexchars,'0').';' );

}



/**

 * Helper function to determine if a Unicode value is valid.

 *

 * @param int $i Unicode value

 * @return bool True if the value was a valid Unicode number

 */

function valid_unicode($i) {

	return ( $i == 0x9 || $i == 0xa || $i == 0xd ||

			($i >= 0x20 && $i <= 0xd7ff) ||

			($i >= 0xe000 && $i <= 0xfffd) ||

			($i >= 0x10000 && $i <= 0x10ffff) );

}



/**

 * Convert all entities to their character counterparts.

 *

 * This function decodes numeric HTML entities (&#65; and &#x41;). It doesn't do

 * anything with other entities like &auml;, but we don't need them in the URL

 * protocol whitelisting system anyway.

 *

 * @since 1.0.0

 *

 * @param string $string Content to change entities

 * @return string Content after decoded entities

 */

function wp_kses_decode_entities($string) {

	$string = preg_replace_callback('/&#([0-9]+);/', '_wp_kses_decode_entities_chr', $string);

	$string = preg_replace_callback('/&#[Xx]([0-9A-Fa-f]+);/', '_wp_kses_decode_entities_chr_hexdec', $string);



	return $string;

}



/**

 * Regex callback for wp_kses_decode_entities()

 *

 * @param array $match preg match

 * @return string

 */

function _wp_kses_decode_entities_chr( $match ) {

	return chr( $match[1] );

}



/**

 * Regex callback for wp_kses_decode_entities()

 *

 * @param array $match preg match

 * @return string

 */

function _wp_kses_decode_entities_chr_hexdec( $match ) {

	return chr( hexdec( $match[1] ) );

}



/**

 * Sanitize content with allowed HTML Kses rules.

 *

 * @since 1.0.0

 * @uses $allowedtags

 *

 * @param string $data Content to filter, expected to be escaped with slashes

 * @return string Filtered content

 */

function wp_filter_kses( $data ) {

	return addslashes( wp_kses( stripslashes( $data ), current_filter() ) );

}



/**

 * Sanitize content with allowed HTML Kses rules.

 *

 * @since 2.9.0

 * @uses $allowedtags

 *

 * @param string $data Content to filter, expected to not be escaped

 * @return string Filtered content

 */

function wp_kses_data( $data ) {

	return wp_kses( $data , current_filter() );

}



/**

 * Sanitize content for allowed HTML tags for post content.

 *

 * Post content refers to the page contents of the 'post' type and not $_POST

 * data from forms.

 *

 * @since 2.0.0

 *

 * @param string $data Post content to filter, expected to be escaped with slashes

 * @return string Filtered post content with allowed HTML tags and attributes intact.

 */

function wp_filter_post_kses($data) {

	return addslashes ( wp_kses( stripslashes( $data ), 'post' ) );

}



/**

 * Sanitize content for allowed HTML tags for post content.

 *

 * Post content refers to the page contents of the 'post' type and not $_POST

 * data from forms.

 *

 * @since 2.9.0

 *

 * @param string $data Post content to filter

 * @return string Filtered post content with allowed HTML tags and attributes intact.

 */

function wp_kses_post($data) {

	return wp_kses( $data , 'post' );

}



/**

 * Strips all of the HTML in the content.

 *

 * @since 2.1.0

 *

 * @param string $data Content to strip all HTML from

 * @return string Filtered content without any HTML

 */

function wp_filter_nohtml_kses( $data ) {

	return addslashes ( wp_kses( stripslashes( $data ), 'strip' ) );

}



/**

 * Adds all Kses input form content filters.

 *

 * All hooks have default priority. The wp_filter_kses() function is added to

 * the 'pre_comment_content' and 'title_save_pre' hooks.

 *

 * The wp_filter_post_kses() function is added to the 'content_save_pre',

 * 'excerpt_save_pre', and 'content_filtered_save_pre' hooks.

 *

 * @since 2.0.0

 * @uses add_filter() See description for what functions are added to what hooks.

 */

function kses_init_filters() {

	// Normal filtering

	add_filter('title_save_pre', 'wp_filter_kses');



	// Comment filtering

	if ( current_user_can( 'unfiltered_html' ) )

		add_filter( 'pre_comment_content', 'wp_filter_post_kses' );

	else

		add_filter( 'pre_comment_content', 'wp_filter_kses' );



	// Post filtering

	add_filter('content_save_pre', 'wp_filter_post_kses');

	add_filter('excerpt_save_pre', 'wp_filter_post_kses');

	add_filter('content_filtered_save_pre', 'wp_filter_post_kses');

}



/**

 * Removes all Kses input form content filters.

 *

 * A quick procedural method to removing all of the filters that kses uses for

 * content in WordPress Loop.

 *

 * Does not remove the kses_init() function from 'init' hook (priority is

 * default). Also does not remove kses_init() function from 'set_current_user'

 * hook (priority is also default).

 *

 * @since 2.0.6

 */

function kses_remove_filters() {

	// Normal filtering

	remove_filter('title_save_pre', 'wp_filter_kses');



	// Comment filtering

	remove_filter( 'pre_comment_content', 'wp_filter_post_kses' );

	remove_filter( 'pre_comment_content', 'wp_filter_kses' );



	// Post filtering

	remove_filter('content_save_pre', 'wp_filter_post_kses');

	remove_filter('excerpt_save_pre', 'wp_filter_post_kses');

	remove_filter('content_filtered_save_pre', 'wp_filter_post_kses');

}



/**

 * Sets up most of the Kses filters for input form content.

 *

 * If you remove the kses_init() function from 'init' hook and

 * 'set_current_user' (priority is default), then none of the Kses filter hooks

 * will be added.

 *

 * First removes all of the Kses filters in case the current user does not need

 * to have Kses filter the content. If the user does not have unfiltered_html

 * capability, then Kses filters are added.

 *

 * @uses kses_remove_filters() Removes the Kses filters

 * @uses kses_init_filters() Adds the Kses filters back if the user

 *		does not have unfiltered HTML capability.

 * @since 2.0.0

 */

function kses_init() {

	kses_remove_filters();



	if (current_user_can('unfiltered_html') == false)

		kses_init_filters();

}



add_action('init', 'kses_init');

add_action('set_current_user', 'kses_init');



/**

 * Inline CSS filter

 *

 * @since 2.8.1

 */

function safecss_filter_attr( $css, $deprecated = '' ) {

	if ( !empty( $deprecated ) )

		_deprecated_argument( __FUNCTION__, '2.8.1' ); // Never implemented



	$css = wp_kses_no_null($css);

	$css = str_replace(array("\n","\r","\t"), '', $css);



	if ( preg_match( '%[\\(&=}]|/\*%', $css ) ) // remove any inline css containing \ ( & } = or comments

		return '';



	$css_array = explode( ';', trim( $css ) );



	/**

	 * Filter list of allowed CSS attributes.

	 *

	 * @since 2.8.1

	 *

	 * @param array $attr List of allowed CSS attributes.

	 */

	$allowed_attr = apply_filters( 'safe_style_css', array( 'text-align', 'margin', 'color', 'float',

	'border', 'background', 'background-color', 'border-bottom', 'border-bottom-color',

	'border-bottom-style', 'border-bottom-width', 'border-collapse', 'border-color', 'border-left',

	'border-left-color', 'border-left-style', 'border-left-width', 'border-right', 'border-right-color',

	'border-right-style', 'border-right-width', 'border-spacing', 'border-style', 'border-top',

	'border-top-color', 'border-top-style', 'border-top-width', 'border-width', 'caption-side',

	'clear', 'cursor', 'direction', 'font', 'font-family', 'font-size', 'font-style',

	'font-variant', 'font-weight', 'height', 'letter-spacing', 'line-height', 'margin-bottom',

	'margin-left', 'margin-right', 'margin-top', 'overflow', 'padding', 'padding-bottom',

	'padding-left', 'padding-right', 'padding-top', 'text-decoration', 'text-indent', 'vertical-align',

	'width' ) );



	if ( empty($allowed_attr) )

		return $css;



	$css = '';

	foreach ( $css_array as $css_item ) {

		if ( $css_item == '' )

			continue;

		$css_item = trim( $css_item );

		$found = false;

		if ( strpos( $css_item, ':' ) === false ) {

			$found = true;

		} else {

			$parts = explode( ':', $css_item );

			if ( in_array( trim( $parts[0] ), $allowed_attr ) )

				$found = true;

		}

		if ( $found ) {

			if( $css != '' )

				$css .= ';';

			$css .= $css_item;

		}

	}



	return $css;

}



/**

 * Helper function to add global attributes to a tag in the allowed html list.

 *

 * @since 3.5.0

 * @access private

 *

 * @param array $value An array of attributes.

 * @return array The array of attributes with global attributes added.

 */

function _wp_add_global_attributes( $value ) {

	$global_attributes = array(

		'class' => true,

		'id' => true,

		'style' => true,

		'title' => true,

		'role' => true,

	);



	if ( true === $value )

		$value = array();



	if ( is_array( $value ) )

		return array_merge( $value, $global_attributes );



	return $value;

}