<?php
/*
* Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
* Version 1.0.3 (Dyrad)
* Copyright (C) 2006-2007 Dan Fuhry
*
* This program is Free Software; you can redistribute 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 details.
*
* This script contains code originally found in MediaWiki (http://www.mediawiki.org). MediaWiki is also licensed under
* the GPLv2; see the file GPL included with this package for details.
*
* We're using the MW parser because the Text_Wiki version simply refused to work under PHP 5.2.0. Porting this was
* _not_ easy. <leaves to get cup of coffee>
*/
global $mStripState, $wgRandomKey;
$mStripState = Array();
$attrib = '[a-zA-Z0-9]';
$space = '[\x09\x0a\x0d\x20]';
define( 'MW_CHAR_REFS_REGEX',
'/&([A-Za-z0-9]+);
|&\#([0-9]+);
|&\#x([0-9A-Za-z]+);
|&\#X([0-9A-Za-z]+);
|(&)/x' );
define( 'MW_ATTRIBS_REGEX',
"/(?:^|$space)($attrib+)
($space*=$space*
(?:
# The attribute value: quoted or alone
".'"'."([^<".'"'."]*)".'"'."
| '([^<']*)'
| ([a-zA-Z0-9!#$%&()*,\\-.\\/:;<>?@[\\]^_`{|}~]+)
| (\#[0-9a-fA-F]+) # Technically wrong, but lots of
# colors are specified like this.
# We'll be normalizing it.
)
)?(?=$space|\$)/sx" );
/**
* emulate mediawiki parser, including stripping, etc.
*
* @param string $text the text to parse
* @return string
* @access public
*/
function process_tables( $text )
{
// include some globals, do some parser stuff that would normally be done in the parent parser function
global $mStripState;
$x =& $mStripState;
//$text = mwStrip( $text, $x );
// parse the text
$text = doTableStuff($text);
// Unstrip it
// $text = unstrip( $text, $mStripState );
// $text = unstripNoWiki( $text, $mStripState );
//die('<pre>'.print_r($mStripState, true).'</pre>');
return $text;
}
/**
* parse the wiki syntax used to render tables
*
* @param string $t the text to parse
* @return string
* @access private
*/
function doTableStuff( $t ) {
$t = explode ( "\n" , $t ) ;
$td = array () ; # Is currently a td tag open?
$ltd = array () ; # Was it TD or TH?
$tr = array () ; # Is currently a tr tag open?
$ltr = array () ; # tr attributes
$has_opened_tr = array(); # Did this table open a <tr> element?
$indent_level = 0; # indent level of the table
foreach ( $t AS $k => $x )
{
$x = trim ( $x ) ;
$fc = substr ( $x , 0 , 1 ) ;
if ( preg_match( '/^(:*)\{\|(.*)$/', $x, $matches ) ) {
$indent_level = strlen( $matches[1] );
$attributes = unstripForHTML( $matches[2] );
$t[$k] = str_repeat( '<dl><dd>', $indent_level ) .
'<nowiki><table' . fixTagAttributes( $attributes, 'table' ) . '></nowiki>' ;
array_push ( $td , false ) ;
array_push ( $ltd , '' ) ;
array_push ( $tr , false ) ;
array_push ( $ltr , '' ) ;
array_push ( $has_opened_tr, false );
}
else if ( count ( $td ) == 0 ) { } # Don't do any of the following
else if ( '|}' == substr ( $x , 0 , 2 ) ) {
$z = "<nowiki></table></nowiki>" . substr ( $x , 2);
$l = array_pop ( $ltd ) ;
if ( !array_pop ( $has_opened_tr ) ) $z = "<nowiki><tr><td></td></tr></nowiki>" . $z ;
if ( array_pop ( $tr ) ) $z = '<nowiki></tr></nowiki>' . $z ;
if ( array_pop ( $td ) ) $z = '<nowiki></'.$l.'></nowiki>' . $z ;
array_pop ( $ltr ) ;
$t[$k] = $z . str_repeat( '<nowiki></dd></dl></nowiki>', $indent_level );
}
else if ( '|-' == substr ( $x , 0 , 2 ) ) { # Allows for |---------------
$x = substr ( $x , 1 ) ;
while ( $x != '' && substr ( $x , 0 , 1 ) == '-' ) $x = substr ( $x , 1 ) ;
$z = '' ;
$l = array_pop ( $ltd ) ;
array_pop ( $has_opened_tr );
array_push ( $has_opened_tr , true ) ;
if ( array_pop ( $tr ) ) $z = '<nowiki></tr></nowiki>' . $z ;
if ( array_pop ( $td ) ) $z = '<nowiki></'.$l.'></nowiki>' . $z ;
array_pop ( $ltr ) ;
$t[$k] = $z ;
array_push ( $tr , false ) ;
array_push ( $td , false ) ;
array_push ( $ltd , '' ) ;
$attributes = unstripForHTML( $x );
array_push ( $ltr , fixTagAttributes( $attributes, 'tr' ) ) ;
}
else if ( '|' == $fc || '!' == $fc || '|+' == substr ( $x , 0 , 2 ) ) { # Caption
# $x is a table row
if ( '|+' == substr ( $x , 0 , 2 ) ) {
$fc = '+' ;
$x = substr ( $x , 1 ) ;
}
$after = substr ( $x , 1 ) ;
if ( $fc == '!' ) $after = str_replace ( '!!' , '||' , $after ) ;
// Split up multiple cells on the same line.
// FIXME: This can result in improper nesting of tags processed
// by earlier parser steps, but should avoid splitting up eg
// attribute values containing literal "||".
$after = wfExplodeMarkup( '||', $after );
$t[$k] = '' ;
# Loop through each table cell
foreach ( $after AS $theline )
{
$z = '' ;
if ( $fc != '+' )
{
$tra = array_pop ( $ltr ) ;
if ( !array_pop ( $tr ) ) $z = '<nowiki><tr'.$tra."></nowiki>\n" ;
array_push ( $tr , true ) ;
array_push ( $ltr , '' ) ;
array_pop ( $has_opened_tr );
array_push ( $has_opened_tr , true ) ;
}
$l = array_pop ( $ltd ) ;
if ( array_pop ( $td ) ) $z = '<nowiki></'.$l.'></nowiki>' . $z ;
if ( $fc == '|' ) $l = 'td' ;
else if ( $fc == '!' ) $l = 'th' ;
else if ( $fc == '+' ) $l = 'caption' ;
else $l = '' ;
array_push ( $ltd , $l ) ;
# Cell parameters
$y = explode ( '|' , $theline , 2 ) ;
# Note that a '|' inside an invalid link should not
# be mistaken as delimiting cell parameters
if ( strpos( $y[0], '[[' ) !== false ) {
$y = array ($theline);
}
if ( count ( $y ) == 1 )
$y = "{$z}<nowiki><{$l}></nowiki>{$y[0]}" ;
else {
$attributes = unstripForHTML( $y[0] );
$y = "{$z}<nowiki><{$l}".fixTagAttributes($attributes, $l)."></nowiki>{$y[1]}" ;
}
$t[$k] .= $y ;
array_push ( $td , true ) ;
}
}
}
# Closing open td, tr && table
while ( count ( $td ) > 0 )
{
$l = array_pop ( $ltd ) ;
if ( array_pop ( $td ) ) $t[] = '<nowiki></td></nowiki>' ;
if ( array_pop ( $tr ) ) $t[] = '<nowiki></tr></nowiki>' ;
if ( !array_pop ( $has_opened_tr ) ) $t[] = "<nowiki><tr><td></td></tr></nowiki>" ;
$t[] = '<nowiki></table></nowiki>' ;
}
$t = implode ( "\n" , $t ) ;
# special case: don't return empty table
if($t == "<nowiki><table></nowiki>\n<nowiki><tr><td></td></tr></nowiki>\n<nowiki></table></nowiki>")
$t = '';
return $t ;
}
/**
* Take a tag soup fragment listing an HTML element's attributes
* and normalize it to well-formed XML, discarding unwanted attributes.
* Output is safe for further wikitext processing, with escaping of
* values that could trigger problems.
*
* - Normalizes attribute names to lowercase
* - Discards attributes not on a whitelist for the given element
* - Turns broken or invalid entities into plaintext
* - Double-quotes all attribute values
* - Attributes without values are given the name as attribute
* - Double attributes are discarded
* - Unsafe style attributes are discarded
* - Prepends space if there are attributes.
*
* @param string $text
* @param string $element
* @return string
*/
function fixTagAttributes( $text, $element ) {
if( trim( $text ) == '' ) {
return '';
}
$stripped = validateTagAttributes(
decodeTagAttributes( $text ), $element );
$attribs = array();
foreach( $stripped as $attribute => $value ) {
$encAttribute = htmlspecialchars( $attribute );
$encValue = safeEncodeAttribute( $value );
$attribs[] = "$encAttribute=".'"'."$encValue".'"'.""; // "
}
return count( $attribs ) ? ' ' . implode( ' ', $attribs ) : '';
}
/**
* Encode an attribute value for HTML tags, with extra armoring
* against further wiki processing.
* @param $text
* @return HTML-encoded text fragment
*/
function safeEncodeAttribute( $text ) {
$encValue= encodeAttribute( $text );
# Templates and links may be expanded in later parsing,
# creating invalid or dangerous output. Suppress this.
$encValue = strtr( $encValue, array(
'<' => '<', // This should never happen,
'>' => '>', // we've received invalid input
'"' => '"', // which should have been escaped.
'{' => '{',
'[' => '[',
"''" => '''',
'ISBN' => 'ISBN',
'RFC' => 'RFC',
'PMID' => 'PMID',
'|' => '|',
'__' => '__',
) );
return $encValue;
}
/**
* Encode an attribute value for HTML output.
* @param $text
* @return HTML-encoded text fragment
*/
function encodeAttribute( $text ) {
// In Enano 1.0.3, added this cheapo hack to keep ampersands
// from being double-sanitized. Thanks to markybob from #deluge.
$encValue = strtr( $text, array(
'&' => '&'
) );
$encValue = htmlspecialchars( $text );
// Whitespace is normalized during attribute decoding,
// so if we've been passed non-spaces we must encode them
// ahead of time or they won't be preserved.
$encValue = strtr( $encValue, array(
"\n" => ' ',
"\r" => ' ',
"\t" => '	',
) );
return $encValue;
}
function unstripForHTML( $text ) {
global $mStripState;
$text = unstrip( $text, $mStripState );
$text = unstripNoWiki( $text, $mStripState );
return $text;
}
/**
* Always call this after unstrip() to preserve the order
*
* @private
*/
function unstripNoWiki( $text, &$state ) {
if ( !isset( $state['nowiki'] ) ) {
return $text;
}
# TODO: good candidate for FSS
$text = strtr( $text, $state['nowiki'] );
return $text;
}
/**
* Take an array of attribute names and values and normalize or discard
* illegal values for the given element type.
*
* - Discards attributes not on a whitelist for the given element
* - Unsafe style attributes are discarded
*
* @param array $attribs
* @param string $element
* @return array
*
* @todo Check for legal values where the DTD limits things.
* @todo Check for unique id attribute :P
*/
function validateTagAttributes( $attribs, $element ) {
$whitelist = array_flip( attributeWhitelist( $element ) );
$out = array();
foreach( $attribs as $attribute => $value ) {
if( !isset( $whitelist[$attribute] ) ) {
continue;
}
# Strip javascript "expression" from stylesheets.
# http://msdn.microsoft.com/workshop/author/dhtml/overview/recalc.asp
if( $attribute == 'style' ) {
$value = checkCss( $value );
if( $value === false ) {
# haxx0r
continue;
}
}
if ( $attribute === 'id' )
$value = escapeId( $value );
// If this attribute was previously set, override it.
// Output should only have one attribute of each name.
$out[$attribute] = $value;
}
return $out;
}
/**
* Pick apart some CSS and check it for forbidden or unsafe structures.
* Returns a sanitized string, or false if it was just too evil.
*
* Currently URL references, 'expression', 'tps' are forbidden.
*
* @param string $value
* @return mixed
*/
function checkCss( $value ) {
$stripped = decodeCharReferences( $value );
// Remove any comments; IE gets token splitting wrong
$stripped = preg_replace( '!/\\*.*?\\*/!S', '', $stripped );
$value = $stripped;
// ... and continue checks
$stripped = preg_replace( '!\\\\([0-9A-Fa-f]{1,6})[ \\n\\r\\t\\f]?!e',
'codepointToUtf8(hexdec("$1"))', $stripped );
$stripped = str_replace( '\\', '', $stripped );
if( preg_match( '/(expression|tps*:\/\/|url\\s*\().*/is',
$stripped ) ) {
# haxx0r
return false;
}
return $value;
}
/**
* Decode any character references, numeric or named entities,
* in the text and return a UTF-8 string.
*
* @param string $text
* @return string
* @access public
* @static
*/
function decodeCharReferences( $text ) {
return preg_replace_callback(
MW_CHAR_REFS_REGEX,
'decodeCharReferencesCallback',
$text );
}
/**
* Fetch the whitelist of acceptable attributes for a given
* element name.
*
* @param string $element
* @return array
*/
function attributeWhitelist( $element ) {
static $list;
if( !isset( $list ) ) {
$list = setupAttributeWhitelist();
}
return isset( $list[$element] )
? $list[$element]
: array();
}
/**
* @todo Document it a bit
* @return array
*/
function setupAttributeWhitelist() {
global $db, $session, $paths, $template, $plugins;
$common = array( 'id', 'class', 'lang', 'dir', 'title', 'style' );
$block = array_merge( $common, array( 'align' ) );
$tablealign = array( 'align', 'char', 'charoff', 'valign' );
$tablecell = array( 'abbr',
'axis',
'headers',
'scope',
'rowspan',
'colspan',
'nowrap', # deprecated
'width', # deprecated
'height', # deprecated
'bgcolor' # deprecated
);
# Numbers refer to sections in HTML 4.01 standard describing the element.
# See: http://www.w3.org/TR/html4/
$whitelist = array (
# 7.5.4
'div' => $block,
'center' => $common, # deprecated
'span' => $block, # ??
# 7.5.5
'h1' => $block,
'h2' => $block,
'h3' => $block,
'h4' => $block,
'h5' => $block,
'h6' => $block,
# 7.5.6
# address
# 8.2.4
# bdo
# 9.2.1
'em' => $common,
'strong' => $common,
'cite' => $common,
# dfn
'code' => $common,
# samp
# kbd
'var' => $common,
# abbr
# acronym
# 9.2.2
'blockquote' => array_merge( $common, array( 'cite' ) ),
# q
# 9.2.3
'sub' => $common,
'sup' => $common,
# 9.3.1
'p' => $block,
# 9.3.2
'br' => array( 'id', 'class', 'title', 'style', 'clear' ),
# 9.3.4
'pre' => array_merge( $common, array( 'width' ) ),
# 9.4
'ins' => array_merge( $common, array( 'cite', 'datetime' ) ),
'del' => array_merge( $common, array( 'cite', 'datetime' ) ),
# 10.2
'ul' => array_merge( $common, array( 'type' ) ),
'ol' => array_merge( $common, array( 'type', 'start' ) ),
'li' => array_merge( $common, array( 'type', 'value' ) ),
# 10.3
'dl' => $common,
'dd' => $common,
'dt' => $common,
# 11.2.1
'table' => array_merge( $common,
array( 'summary', 'width', 'border', 'frame',
'rules', 'cellspacing', 'cellpadding',
'align', 'bgcolor',
) ),
# 11.2.2
'caption' => array_merge( $common, array( 'align' ) ),
# 11.2.3
'thead' => array_merge( $common, $tablealign ),
'tfoot' => array_merge( $common, $tablealign ),
'tbody' => array_merge( $common, $tablealign ),
# 11.2.4
'colgroup' => array_merge( $common, array( 'span', 'width' ), $tablealign ),
'col' => array_merge( $common, array( 'span', 'width' ), $tablealign ),
# 11.2.5
'tr' => array_merge( $common, array( 'bgcolor' ), $tablealign ),
# 11.2.6
'td' => array_merge( $common, $tablecell, $tablealign ),
'th' => array_merge( $common, $tablecell, $tablealign ),
# 12.2
# added by dan
'a' => array_merge( $common, array( 'href', 'name' ) ),
# 13.2
# added by dan
'img' => array_merge( $common, array( 'src', 'width', 'height', 'alt' ) ),
# 15.2.1
'tt' => $common,
'b' => $common,
'i' => $common,
'big' => $common,
'small' => $common,
'strike' => $common,
's' => $common,
'u' => $common,
# 15.2.2
'font' => array_merge( $common, array( 'size', 'color', 'face' ) ),
# basefont
# 15.3
'hr' => array_merge( $common, array( 'noshade', 'size', 'width' ) ),
# XHTML Ruby annotation text module, simple ruby only.
# http://www.w3c.org/TR/ruby/
'ruby' => $common,
# rbc
# rtc
'rb' => $common,
'rt' => $common, #array_merge( $common, array( 'rbspan' ) ),
'rp' => $common,
# For compatibility with the XHTML parser.
'nowiki' => array(),
'noinclude' => array(),
'nodisplay' => array(),
'lang' => array('code'),
# XHTML stuff
'acronym' => $common
);
// custom tags can be added by plugins
$code = $plugins->setHook('html_attribute_whitelist');
foreach ( $code as $cmd )
{
eval($cmd);
}
return $whitelist;
}
/**
* Given a value escape it so that it can be used in an id attribute and
* return it, this does not validate the value however (see first link)
*
* @link http://www.w3.org/TR/html401/types.html#type-name Valid characters
* in the id and
* name attributes
* @link http://www.w3.org/TR/html401/struct/links.html#h-12.2.3 Anchors with the id attribute
*
* @bug 4461
*
* @static
*
* @param string $id
* @return string
*/
function escapeId( $id ) {
static $replace = array(
'%3A' => ':',
'%' => '.'
);
$id = urlencode( decodeCharReferences( strtr( $id, ' ', '_' ) ) );
return str_replace( array_keys( $replace ), array_values( $replace ), $id );
}
/**
* More or less "markup-safe" explode()
* Ignores any instances of the separator inside <...>
* @param string $separator
* @param string $text
* @return array
*/
function wfExplodeMarkup( $separator, $text ) {
$placeholder = "\x00";
// Just in case...
$text = str_replace( $placeholder, '', $text );
// Trim stuff
$replacer = new ReplacerCallback( $separator, $placeholder );
$cleaned = preg_replace_callback( '/(<.*?>)/', array( $replacer, 'go' ), $text );
$items = explode( $separator, $cleaned );
foreach( $items as $i => $str ) {
$items[$i] = str_replace( $placeholder, $separator, $str );
}
return $items;
}
class ReplacerCallback {
function ReplacerCallback( $from, $to ) {
$this->from = $from;
$this->to = $to;
}
function go( $matches ) {
return str_replace( $this->from, $this->to, $matches[1] );
}
}
/**
* Return an associative array of attribute names and values from
* a partial tag string. Attribute names are forces to lowercase,
* character references are decoded to UTF-8 text.
*
* @param string
* @return array
*/
function decodeTagAttributes( $text ) {
$attribs = array();
if( trim( $text ) == '' ) {
return $attribs;
}
$pairs = array();
if( !preg_match_all(
MW_ATTRIBS_REGEX,
$text,
$pairs,
PREG_SET_ORDER ) ) {
return $attribs;
}
foreach( $pairs as $set ) {
$attribute = strtolower( $set[1] );
$value = getTagAttributeCallback( $set );
// Normalize whitespace
$value = preg_replace( '/[\t\r\n ]+/', ' ', $value );
$value = trim( $value );
// Decode character references
$attribs[$attribute] = decodeCharReferences( $value );
}
return $attribs;
}
/**
* Pick the appropriate attribute value from a match set from the
* MW_ATTRIBS_REGEX matches.
*
* @param array $set
* @return string
* @access private
*/
function getTagAttributeCallback( $set ) {
if( isset( $set[6] ) ) {
# Illegal #XXXXXX color with no quotes.
return $set[6];
} elseif( isset( $set[5] ) ) {
# No quotes.
return $set[5];
} elseif( isset( $set[4] ) ) {
# Single-quoted
return $set[4];
} elseif( isset( $set[3] ) ) {
# Double-quoted
return $set[3];
} elseif( !isset( $set[2] ) ) {
# In XHTML, attributes must have a value.
# For 'reduced' form, return explicitly the attribute name here.
return $set[1];
} else {
die_friendly('Parser error', "<p>Tag conditions not met. This should never happen and is a bug.</p>" );
}
}
/**
* Strips and renders nowiki, pre, math, hiero
* If $render is set, performs necessary rendering operations on plugins
* Returns the text, and fills an array with data needed in unstrip()
* If the $state is already a valid strip state, it adds to the state
*
* @param bool $stripcomments when set, HTML comments <!-- like this -->
* will be stripped in addition to other tags. This is important
* for section editing, where these comments cause confusion when
* counting the sections in the wikisource
*
* @param array dontstrip contains tags which should not be stripped;
* used to prevent stipping of <gallery> when saving (fixes bug 2700)
*
* @access private
*/
function mwStrip( $text, &$state, $stripcomments = false , $dontstrip = array () ) {
global $wgRandomKey;
$render = true;
$wgRandomKey = "\x07UNIQ" . dechex(mt_rand(0, 0x7fffffff)) . dechex(mt_rand(0, 0x7fffffff));
$uniq_prefix =& $wgRandomKey;
$commentState = array();
$elements = array( 'nowiki', 'gallery' );
# Removing $dontstrip tags from $elements list (currently only 'gallery', fixing bug 2700)
foreach ( $elements AS $k => $v ) {
if ( !in_array ( $v , $dontstrip ) ) continue;
unset ( $elements[$k] );
}
$matches = array();
$text = extractTagsAndParams( $elements, $text, $matches, $uniq_prefix );
foreach( $matches as $marker => $data ) {
list( $element, $content, $params, $tag ) = $data;
if( $render ) {
$tagName = strtolower( $element );
switch( $tagName ) {
case '!--':
// Comment
if( substr( $tag, -3 ) == '-->' ) {
$output = $tag;
} else {
// Unclosed comment in input.
// Close it so later stripping can remove it
$output = "$tag-->";
}
break;
case 'html':
if( $wgRawHtml ) {
$output = $content;
break;
}
// Shouldn't happen otherwise. :)
case 'nowiki':
$output = wfEscapeHTMLTagsOnly( $content );
break;
default:
}
} else {
// Just stripping tags; keep the source
$output = $tag;
}
// Unstrip the output, because unstrip() is no longer recursive so
// it won't do it itself
$output = unstrip( $output, $state );
if( !$stripcomments && $element == '!--' ) {
$commentState[$marker] = $output;
} elseif ( $element == 'html' || $element == 'nowiki' ) {
$state['nowiki'][$marker] = $output;
} else {
$state['general'][$marker] = $output;
}
}
# Unstrip comments unless explicitly told otherwise.
# (The comments are always stripped prior to this point, so as to
# not invoke any extension tags / parser hooks contained within
# a comment.)
if ( !$stripcomments ) {
// Put them all back and forget them
$text = strtr( $text, $commentState );
}
return $text;
}
/**
* Replaces all occurrences of HTML-style comments and the given tags
* in the text with a random marker and returns teh next text. The output
* parameter $matches will be an associative array filled with data in
* the form:
* 'UNIQ-xxxxx' => array(
* 'element',
* 'tag content',
* array( 'param' => 'x' ),
* '<element param="x">tag content</element>' ) )
*
* @param $elements list of element names. Comments are always extracted.
* @param $text Source text string.
* @param $uniq_prefix
*
* @access private
* @static
*/
function extractTagsAndParams($elements, $text, &$matches, $uniq_prefix = ''){
static $n = 1;
$stripped = '';
$matches = array();
$taglist = implode( '|', $elements );
$start = "/<($taglist)(\\s+[^>]*?|\\s*?)(\/?>)|<(!--)/i";
while ( '' != $text ) {
$p = preg_split( $start, $text, 2, PREG_SPLIT_DELIM_CAPTURE );
$stripped .= $p[0];
if( count( $p ) < 5 ) {
break;
}
if( count( $p ) > 5 ) {
// comment
$element = $p[4];
$attributes = '';
$close = '';
$inside = $p[5];
} else {
// tag
$element = $p[1];
$attributes = $p[2];
$close = $p[3];
$inside = $p[4];
}
$marker = "$uniq_prefix-$element-" . sprintf('%08X', $n++) . '-QINU';
$stripped .= $marker;
if ( $close === '/>' ) {
// Empty element tag, <tag />
$content = null;
$text = $inside;
$tail = null;
} else {
if( $element == '!--' ) {
$end = '/(-->)/';
} else {
$end = "/(<\\/$element\\s*>)/i";
}
$q = preg_split( $end, $inside, 2, PREG_SPLIT_DELIM_CAPTURE );
$content = $q[0];
if( count( $q ) < 3 ) {
# No end tag -- let it run out to the end of the text.
$tail = '';
$text = '';
} else {
$tail = $q[1];
$text = $q[2];
}
}
$matches[$marker] = array( $element,
$content,
decodeTagAttributes( $attributes ),
"<$element$attributes$close$content$tail" );
}
return $stripped;
}
/**
* Escape html tags
* Basically replacing " > and < with HTML entities ( ", >, <)
*
* @param $in String: text that might contain HTML tags.
* @return string Escaped string
*/
function wfEscapeHTMLTagsOnly( $in ) {
return str_replace(
array( '"', '>', '<' ),
array( '"', '>', '<' ),
$in );
}
/**
* Restores pre, math, and other extensions removed by strip()
*
* always call unstripNoWiki() after this one
* @private
*/
function unstrip( $text, &$state ) {
if ( !isset( $state['general'] ) ) {
return $text;
}
# TODO: good candidate for FSS
$text = strtr( $text, $state['general'] );
return $text;
}
/**
* Return UTF-8 string for a codepoint if that is a valid
* character reference, otherwise U+FFFD REPLACEMENT CHARACTER.
* @param int $codepoint
* @return string
* @private
*/
function decodeChar( $codepoint ) {
if( validateCodepoint( $codepoint ) ) {
return codepointToUtf8( $codepoint );
} else {
return UTF8_REPLACEMENT;
}
}
/**
* If the named entity is defined in the HTML 4.0/XHTML 1.0 DTD,
* return the UTF-8 encoding of that character. Otherwise, returns
* pseudo-entity source (eg &foo;)
*
* @param string $name
* @return string
*/
function decodeEntity( $name ) {
global $wgHtmlEntities;
if( isset( $wgHtmlEntities[$name] ) ) {
return codepointToUtf8( $wgHtmlEntities[$name] );
} else {
return "&$name;";
}
}
/**
* Returns true if a given Unicode codepoint is a valid character in XML.
* @param int $codepoint
* @return bool
*/
function validateCodepoint( $codepoint ) {
return ($codepoint == 0x09)
|| ($codepoint == 0x0a)
|| ($codepoint == 0x0d)
|| ($codepoint >= 0x20 && $codepoint <= 0xd7ff)
|| ($codepoint >= 0xe000 && $codepoint <= 0xfffd)
|| ($codepoint >= 0x10000 && $codepoint <= 0x10ffff);
}
/**
* Return UTF-8 sequence for a given Unicode code point.
* May die if fed out of range data.
*
* @param $codepoint Integer:
* @return String
* @public
*/
function codepointToUtf8( $codepoint ) {
if($codepoint < 0x80) return chr($codepoint);
if($codepoint < 0x800) return chr($codepoint >> 6 & 0x3f | 0xc0) .
chr($codepoint & 0x3f | 0x80);
if($codepoint < 0x10000) return chr($codepoint >> 12 & 0x0f | 0xe0) .
chr($codepoint >> 6 & 0x3f | 0x80) .
chr($codepoint & 0x3f | 0x80);
if($codepoint < 0x110000) return chr($codepoint >> 18 & 0x07 | 0xf0) .
chr($codepoint >> 12 & 0x3f | 0x80) .
chr($codepoint >> 6 & 0x3f | 0x80) .
chr($codepoint & 0x3f | 0x80);
echo "Asked for code outside of range ($codepoint)\n";
die( -1 );
}
/**
* @param string $matches
* @return string
*/
function decodeCharReferencesCallback( $matches ) {
if( $matches[1] != '' ) {
return decodeEntity( $matches[1] );
} elseif( $matches[2] != '' ) {
return decodeChar( intval( $matches[2] ) );
} elseif( $matches[3] != '' ) {
return decodeChar( hexdec( $matches[3] ) );
} elseif( $matches[4] != '' ) {
return decodeChar( hexdec( $matches[4] ) );
}
# Last case should be an ampersand by itself
return $matches[0];
}
?>