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Created:	15/02/2013 6:58am

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PHP Version

Output: HTML (hide)

Code: (hide)

<?php
 #
 # Markdown - A text-to-HTML conversion tool for web writers
 #
 # PHP Markdown 
 # Copyright (c) 2004-2013 Michel Fortin 
 # <http://michelf.com/projects/php-markdown/>
 #
 # Original Markdown 
 # Copyright (c) 2004-2006 John Gruber 
 # <http://daringfireball.net/projects/markdown/>
 #
 namespace Michelf;
 
 #
 # The following two constants are deprecated: avoid using them, they'll
 # disappear when the Lib branch becomes the only one to be updated.
 #
 # You can get the parser's version using the constant inside of the parser
 # class: \Michelf\Markdown::MARKDOWNLIB_VERSION.
 #
 
 const MARKDOWN_VERSION = "1.0.1p"; # Sun 13 Jan 2013
 const MARKDOWNEXTRA_VERSION = "1.2.6"; # Sun 13 Jan 2013
 
 
 #
 # Markdown Parser Class
 #
 
 class Markdown {
 
 	### Version ###
 
 	const MARKDOWNLIB_VERSION = "1.3-beta4";
 
 	### Simple Function Interface ###
 
 	static function defaultTransform($text) {
 	#
 	# Initialize the parser and return the result of its transform method.
 	# This will work fine for derived classes too.
 	#
 		# Take parser class on which this function was called.
 		$parser_class = \get_called_class();
 
 		# try to take parser from the static parser list
 		static $parser_list;
 		$parser =& $parser_list[$parser_class];
 
 		# create the parser it not already set
 		if (!$parser)
 			$parser = new $parser_class;
 
 		# Transform text using parser.
 		return $parser->transform($text);
 	}
 
 	### Configuration Variables ###
 
 	# Change to ">" for HTML output.
 	var $empty_element_suffix = " />";
 	var $tab_width = 4;
 
 	# Change to `true` to disallow markup or entities.
 	var $no_markup = false;
 	var $no_entities = false;
 
 	# Predefined urls and titles for reference links and images.
 	var $predef_urls = array();
 	var $predef_titles = array();
 
 
 	### Parser Implementation ###
 
 	# Regex to match balanced [brackets].
 	# Needed to insert a maximum bracked depth while converting to PHP.
 	var $nested_brackets_depth = 6;
 	var $nested_brackets_re;
 
 	var $nested_url_parenthesis_depth = 4;
 	var $nested_url_parenthesis_re;
 
 	# Table of hash values for escaped characters:
 	var $escape_chars = '\`*_{}[]()>#+-.!';
 	var $escape_chars_re;
 
 
 	function __construct() {
 	#
 	# Constructor function. Initialize appropriate member variables.
 	#
 		$this->_initDetab();
 		$this->prepareItalicsAndBold();
 
 		$this->nested_brackets_re = 
 			str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
 			str_repeat('\])*', $this->nested_brackets_depth);
 
 		$this->nested_url_parenthesis_re = 
 			str_repeat('(?>[^()\s]+|$', $this->nested_url_parenthesis_depth).
 			str_repeat('(?>$))*', $this->nested_url_parenthesis_depth);
 
 		$this->escape_chars_re = '['.preg_quote($this->escape_chars).']';
 
 		# Sort document, block, and span gamut in ascendent priority order.
 		asort($this->document_gamut);
 		asort($this->block_gamut);
 		asort($this->span_gamut);
 	}
 
 
 	# Internal hashes used during transformation.
 	var $urls = array();
 	var $titles = array();
 	var $html_hashes = array();
 
 	# Status flag to avoid invalid nesting.
 	var $in_anchor = false;
 
 
 	function setup() {
 	#
 	# Called before the transformation process starts to setup parser 
 	# states.
 	#
 		# Clear global hashes.
 		$this->urls = $this->predef_urls;
 		$this->titles = $this->predef_titles;
 		$this->html_hashes = array();
 
 		$in_anchor = false;
 	}
 
 	function teardown() {
 	#
 	# Called after the transformation process to clear any variable 
 	# which may be taking up memory unnecessarly.
 	#
 		$this->urls = array();
 		$this->titles = array();
 		$this->html_hashes = array();
 	}
 
 
 	function transform($text) {
 	#
 	# Main function. Performs some preprocessing on the input text
 	# and pass it through the document gamut.
 	#
 		$this->setup();
 
 		# Remove UTF-8 BOM and marker character in input, if present.
 		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
 
 		# Standardize line endings:
 		# DOS to Unix and Mac to Unix
 		$text = preg_replace('{\r\n?}', "\n", $text);
 
 		# Make sure $text ends with a couple of newlines:
 		$text .= "\n\n";
 
 		# Convert all tabs to spaces.
 		$text = $this->detab($text);
 
 		# Turn block-level HTML blocks into hash entries
 		$text = $this->hashHTMLBlocks($text);
 
 		# Strip any lines consisting only of spaces and tabs.
 		# This makes subsequent regexen easier to write, because we can
 		# match consecutive blank lines with /\n+/ instead of something
 		# contorted like /[ ]*\n+/ .
 		$text = preg_replace('/^[ ]+$/m', '', $text);
 
 		# Run document gamut methods.
 		foreach ($this->document_gamut as $method => $priority) {
 			$text = $this->$method($text);
 		}
 
 		$this->teardown();
 
 		return $text . "\n";
 	}
 
 	var $document_gamut = array(
 		# Strip link definitions, store in hashes.
 		"stripLinkDefinitions" => 20,
 
 		"runBasicBlockGamut" => 30,
 		);
 
 
 	function stripLinkDefinitions($text) {
 	#
 	# Strips link definitions from text, stores the URLs and titles in
 	# hash references.
 	#
 		$less_than_tab = $this->tab_width - 1;
 
 		# Link defs are in the form: ^[id]: url "optional title"
 		$text = preg_replace_callback('{
 							^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?:	# id = $1
 							 [ ]*
 							 \n?				# maybe *one* newline
 							 [ ]*
 							(?:
 							 <(.+?)>			# url = $2
 							|
 							 (\S+?)			# url = $3
 							)
 							 [ ]*
 							 \n?				# maybe one newline
 							 [ ]*
 							(?:
 								(?<=\s)			# lookbehind for whitespace
 								["(]
 								(.*?)			# title = $4
 								[")]
 								[ ]*
 							)?	# title is optional
 							(?:\n+|\Z)
 			}xm',
 			array(&$this, '_stripLinkDefinitions_callback'),
 			$text);
 		return $text;
 	}
 	function _stripLinkDefinitions_callback($matches) {
 		$link_id = strtolower($matches[1]);
 		$url = $matches[2] == '' ? $matches[3] : $matches[2];
 		$this->urls[$link_id] = $url;
 		$this->titles[$link_id] =& $matches[4];
 		return ''; # String that will replace the block
 	}
 
 
 	function hashHTMLBlocks($text) {
 		if ($this->no_markup) return $text;
 
 		$less_than_tab = $this->tab_width - 1;
 
 		# Hashify HTML blocks:
 		# We only want to do this for block-level HTML tags, such as headers,
 		# lists, and tables. That's because we still want to wrap s around
 		# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
 		# phrase emphasis, and spans. The list of tags we're looking for is
 		# hard-coded:
 		#
 		# * List "a" is made of tags which can be both inline or block-level.
 		# These will be treated block-level when the start tag is alone on 
 		# its line, otherwise they're not matched here and will be taken as 
 		# inline later.
 		# * List "b" is made of tags which are always block-level;
 		#
 		$block_tags_a_re = 'ins|del';
 		$block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
 						 'script|noscript|form|fieldset|iframe|math|svg|'.
 						 'article|section|nav|aside|hgroup|header|footer|'.
 						 'figure';
 
 		# Regular expression for the content of a block tag.
 		$nested_tags_level = 4;
 		$attr = '
 			(?>				# optional tag attributes
 			 \s			# starts with whitespace
 			 (?>
 				[^>"/]+		# text outside quotes
 			 |
 				/+(?!>)		# slash not followed by ">"
 			 |
 				"[^"]*"		# text inside double quotes (tolerate ">")
 			 |
 				\'[^\']*\'	# text inside single quotes (tolerate ">")
 			 )*
 			)?	
 			';
 		$content =
 			str_repeat('
 				(?>
 				 [^<]+			# content without tag
 				|
 				 <\2			# nested opening tag
 					'.$attr.'	# attributes
 					(?>
 					 />
 					|
 					 >', $nested_tags_level).	# end of opening tag
 					 '.*?'.					# last level nested tag content
 			str_repeat('
 					 </\2\s*>	# closing nested tag
 					)
 				 |				
 					<(?!/\2\s*>	# other tags with a different name
 				 )
 				)*',
 				$nested_tags_level);
 		$content2 = str_replace('\2', '\3', $content);
 
 		# First, look for nested blocks, e.g.:
 		# 	<div>
 		# 		<div>
 		# 		tags for inner block must be indented.
 		# 		</div>
 		# 	</div>
 		#
 		# The outermost tags must start at the left margin for this to match, and
 		# the inner nested divs must be indented.
 		# We need to do this before the next, more liberal match, because the next
 		# match will start at the first `<div>` and stop at the first `</div>`.
 		$text = preg_replace_callback('{(?>
 			(?>
 				(?<=\n\n)		# Starting after a blank line
 				|				# or
 				\A\n?			# the beginning of the doc
 			)
 			(						# save in $1
 
 			 # Match from `\n<tag>` to `</tag>\n`, handling nested tags 
 			 # in between.
 					
 						[ ]{0,'.$less_than_tab.'}
 						<('.$block_tags_b_re.')# start tag = $2
 						'.$attr.'>			# attributes followed by > and \n
 						'.$content.'		# content, support nesting
 						</\2>				# the matching end tag
 						[ ]*				# trailing spaces/tabs
 						(?=\n+|\Z)	# followed by a newline or end of document
 
 			| # Special version for tags of group a.
 
 						[ ]{0,'.$less_than_tab.'}
 						<('.$block_tags_a_re.')# start tag = $3
 						'.$attr.'>[ ]*\n	# attributes followed by >
 						'.$content2.'		# content, support nesting
 						</\3>				# the matching end tag
 						[ ]*				# trailing spaces/tabs
 						(?=\n+|\Z)	# followed by a newline or end of document
 					
 			| # Special case just for <hr />. It was easier to make a special 
 			 # case than to make the other regex more complicated.
 			
 						[ ]{0,'.$less_than_tab.'}
 						<(hr)				# start tag = $2
 						'.$attr.'			# attributes
 						/?>					# the matching end tag
 						[ ]*
 						(?=\n{2,}|\Z)		# followed by a blank line or end of document
 			
 			| # Special case for standalone HTML comments:
 			
 					[ ]{0,'.$less_than_tab.'}
 					(?s:
 						
 					)
 					[ ]*
 					(?=\n{2,}|\Z)		# followed by a blank line or end of document
 			
 			| # PHP and ASP-style processor instructions (<? and <%)
 			
 					[ ]{0,'.$less_than_tab.'}
 					(?s:
 						<([?%])			# $2
 						.*?
 						\2>
 					)
 					[ ]*
 					(?=\n{2,}|\Z)		# followed by a blank line or end of document
 					
 			)
 			)}Sxmi',
 			array(&$this, '_hashHTMLBlocks_callback'),
 			$text);
 
 		return $text;
 	}
 	function _hashHTMLBlocks_callback($matches) {
 		$text = $matches[1];
 		$key = $this->hashBlock($text);
 		return "\n\n$key\n\n";
 	}
 
 
 	function hashPart($text, $boundary = 'X') {
 	#
 	# Called whenever a tag must be hashed when a function insert an atomic 
 	# element in the text stream. Passing $text to through this function gives
 	# a unique text-token which will be reverted back when calling unhash.
 	#
 	# The $boundary argument specify what character should be used to surround
 	# the token. By convension, "B" is used for block elements that needs not
 	# to be wrapped into paragraph tags at the end, ":" is used for elements
 	# that are word separators and "X" is used in the general case.
 	#
 		# Swap back any tag hash found in $text so we do not have to `unhash`
 		# multiple times at the end.
 		$text = $this->unhash($text);
 
 		# Then hash the block.
 		static $i = 0;
 		$key = "$boundary\x1A" . ++$i . $boundary;
 		$this->html_hashes[$key] = $text;
 		return $key; # String that will replace the tag.
 	}
 
 
 	function hashBlock($text) {
 	#
 	# Shortcut function for hashPart with block-level boundaries.
 	#
 		return $this->hashPart($text, 'B');
 	}
 
 
 	var $block_gamut = array(
 	#
 	# These are all the transformations that form block-level
 	# tags like paragraphs, headers, and list items.
 	#
 		"doHeaders" => 10,
 		"doHorizontalRules" => 20,
 
 		"doLists" => 40,
 		"doCodeBlocks" => 50,
 		"doBlockQuotes" => 60,
 		);
 
 	function runBlockGamut($text) {
 	#
 	# Run block gamut tranformations.
 	#
 		# We need to escape raw HTML in Markdown source before doing anything 
 		# else. This need to be done for each block, and not only at the 
 		# begining in the Markdown function since hashed blocks can be part of
 		# list items and could have been indented. Indented blocks would have 
 		# been seen as a code block in a previous pass of hashHTMLBlocks.
 		$text = $this->hashHTMLBlocks($text);
 
 		return $this->runBasicBlockGamut($text);
 	}
 
 	function runBasicBlockGamut($text) {
 	#
 	# Run block gamut tranformations, without hashing HTML blocks. This is 
 	# useful when HTML blocks are known to be already hashed, like in the first
 	# whole-document pass.
 	#
 		foreach ($this->block_gamut as $method => $priority) {
 			$text = $this->$method($text);
 		}
 
 		# Finally form paragraph and restore hashed blocks.
 		$text = $this->formParagraphs($text);
 
 		return $text;
 	}
 
 
 	function doHorizontalRules($text) {
 		# Do Horizontal Rules:
 		return preg_replace(
 			'{
 				^[ ]{0,3}	# Leading space
 				([-*_])		# $1: First marker
 				(?>			# Repeated marker group
 					[ ]{0,2}	# Zero, one, or two spaces.
 					\1			# Marker character
 				){2,}		# Group repeated at least twice
 				[ ]*		# Tailing spaces
 				$			# End of line.
 			}mx',
 			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n", 
 			$text);
 	}
 
 
 	var $span_gamut = array(
 	#
 	# These are all the transformations that occur *within* block-level
 	# tags like paragraphs, headers, and list items.
 	#
 		# Process character escapes, code spans, and inline HTML
 		# in one shot.
 		"parseSpan" => -30,
 
 		# Process anchor and image tags. Images must come first,
 		# because ![foo][f] looks like an anchor.
 		"doImages" => 10,
 		"doAnchors" => 20,
 
 		# Make links out of things like `<http://example.com/>`
 		# Must come after doAnchors, because you can use < and >
 		# delimiters in inline links like [this](<url>).
 		"doAutoLinks" => 30,
 		"encodeAmpsAndAngles" => 40,
 
 		"doItalicsAndBold" => 50,
 		"doHardBreaks" => 60,
 		);
 
 	function runSpanGamut($text) {
 	#
 	# Run span gamut tranformations.
 	#
 		foreach ($this->span_gamut as $method => $priority) {
 			$text = $this->$method($text);
 		}
 
 		return $text;
 	}
 
 
 	function doHardBreaks($text) {
 		# Do hard breaks:
 		return preg_replace_callback('/ {2,}\n/', 
 			array(&$this, '_doHardBreaks_callback'), $text);
 	}
 	function _doHardBreaks_callback($matches) {
 		return $this->hashPart("<br$this->empty_element_suffix\n");
 	}
 
 
 	function doAnchors($text) {
 	#
 	# Turn Markdown link shortcuts into XHTML <a> tags.
 	#
 		if ($this->in_anchor) return $text;
 		$this->in_anchor = true;
 
 		#
 		# First, handle reference-style links: [link text] [id]
 		#
 		$text = preg_replace_callback('{
 			(					# wrap whole match in $1
 			 \[
 				('.$this->nested_brackets_re.')	# link text = $2
 			 \]
 
 			 [ ]?				# one optional space
 			 (?:\n[ ]*)?		# one optional newline followed by spaces
 
 			 \[
 				(.*?)		# id = $3
 			 \]
 			)
 			}xs',
 			array(&$this, '_doAnchors_reference_callback'), $text);
 
 		#
 		# Next, inline-style links: [link text](url "optional title")
 		#
 		$text = preg_replace_callback('{
 			(				# wrap whole match in $1
 			 \[
 				('.$this->nested_brackets_re.')	# link text = $2
 			 \]
 			 $			# literal paren
 				[ \n]*
 				(?:
 					<(.+?)>	# href = $3
 				|
 					('.$this->nested_url_parenthesis_re.')	# href = $4
 				)
 				[ \n]*
 				(			# $5
 				 ([\'"])	# quote char = $6
 				 (.*?)		# Title = $7
 				 \6		# matching quote
 				 [ \n]*	# ignore any spaces/tabs between closing quote and )
 				)?			# title is optional
 			 $
 			)
 			}xs',
 			array(&$this, '_doAnchors_inline_callback'), $text);
 
 		#
 		# Last, handle reference-style shortcuts: [link text]
 		# These must come last in case you've also got [link text][1]
 		# or [link text](/foo)
 		#
 		$text = preg_replace_callback('{
 			(					# wrap whole match in $1
 			 \[
 				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
 			 \]
 			)
 			}xs',
 			array(&$this, '_doAnchors_reference_callback'), $text);
 
 		$this->in_anchor = false;
 		return $text;
 	}
 	function _doAnchors_reference_callback($matches) {
 		$whole_match = $matches[1];
 		$link_text = $matches[2];
 		$link_id =& $matches[3];
 
 		if ($link_id == "") {
 			# for shortcut links like [this][] or [this].
 			$link_id = $link_text;
 		}
 
 		# lower-case and turn embedded newlines into spaces
 		$link_id = strtolower($link_id);
 		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
 
 		if (isset($this->urls[$link_id])) {
 			$url = $this->urls[$link_id];
 			$url = $this->encodeAttribute($url);
 
 			$result = "<a href=\"$url\"";
 			if ( isset( $this->titles[$link_id] ) ) {
 				$title = $this->titles[$link_id];
 				$title = $this->encodeAttribute($title);
 				$result .= " title=\"$title\"";
 			}
 
 			$link_text = $this->runSpanGamut($link_text);
 			$result .= ">$link_text</a>";
 			$result = $this->hashPart($result);
 		}
 		else {
 			$result = $whole_match;
 		}
 		return $result;
 	}
 	function _doAnchors_inline_callback($matches) {
 		$whole_match	= $matches[1];
 		$link_text		= $this->runSpanGamut($matches[2]);
 		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
 		$title			=& $matches[7];
 
 		$url = $this->encodeAttribute($url);
 
 		$result = "<a href=\"$url\"";
 		if (isset($title)) {
 			$title = $this->encodeAttribute($title);
 			$result .= " title=\"$title\"";
 		}
 
 		$link_text = $this->runSpanGamut($link_text);
 		$result .= ">$link_text</a>";
 
 		return $this->hashPart($result);
 	}
 
 
 	function doImages($text) {
 	#
 	# Turn Markdown image shortcuts into <img> tags.
 	#
 		#
 		# First, handle reference-style labeled images: ![alt text][id]
 		#
 		$text = preg_replace_callback('{
 			(				# wrap whole match in $1
 			 !\[
 				('.$this->nested_brackets_re.')		# alt text = $2
 			 \]
 
 			 [ ]?				# one optional space
 			 (?:\n[ ]*)?		# one optional newline followed by spaces
 
 			 \[
 				(.*?)		# id = $3
 			 \]
 
 			)
 			}xs', 
 			array(&$this, '_doImages_reference_callback'), $text);
 
 		#
 		# Next, handle inline images: ![alt text](url "optional title")
 		# Don't forget: encode * and _
 		#
 		$text = preg_replace_callback('{
 			(				# wrap whole match in $1
 			 !\[
 				('.$this->nested_brackets_re.')		# alt text = $2
 			 \]
 			 \s?			# One optional whitespace character
 			 $			# literal paren
 				[ \n]*
 				(?:
 					<(\S*)>	# src url = $3
 				|
 					('.$this->nested_url_parenthesis_re.')	# src url = $4
 				)
 				[ \n]*
 				(			# $5
 				 ([\'"])	# quote char = $6
 				 (.*?)		# title = $7
 				 \6		# matching quote
 				 [ \n]*
 				)?			# title is optional
 			 $
 			)
 			}xs',
 			array(&$this, '_doImages_inline_callback'), $text);
 
 		return $text;
 	}
 	function _doImages_reference_callback($matches) {
 		$whole_match = $matches[1];
 		$alt_text = $matches[2];
 		$link_id = strtolower($matches[3]);
 
 		if ($link_id == "") {
 			$link_id = strtolower($alt_text); # for shortcut links like ![this][].
 		}
 
 		$alt_text = $this->encodeAttribute($alt_text);
 		if (isset($this->urls[$link_id])) {
 			$url = $this->encodeAttribute($this->urls[$link_id]);
 			$result = "<img src=\"$url\" alt=\"$alt_text\"";
 			if (isset($this->titles[$link_id])) {
 				$title = $this->titles[$link_id];
 				$title = $this->encodeAttribute($title);
 				$result .= " title=\"$title\"";
 			}
 			$result .= $this->empty_element_suffix;
 			$result = $this->hashPart($result);
 		}
 		else {
 			# If there's no such link ID, leave intact:
 			$result = $whole_match;
 		}
 
 		return $result;
 	}
 	function _doImages_inline_callback($matches) {
 		$whole_match	= $matches[1];
 		$alt_text		= $matches[2];
 		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
 		$title			=& $matches[7];
 
 		$alt_text = $this->encodeAttribute($alt_text);
 		$url = $this->encodeAttribute($url);
 		$result = "<img src=\"$url\" alt=\"$alt_text\"";
 		if (isset($title)) {
 			$title = $this->encodeAttribute($title);
 			$result .= " title=\"$title\""; # $title already quoted
 		}
 		$result .= $this->empty_element_suffix;
 
 		return $this->hashPart($result);
 	}
 
 
 	function doHeaders($text) {
 		# Setext-style headers:
 		#	 Header 1
 		#	 ========
 		# 
 		#	 Header 2
 		#	 --------
 		#
 		$text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx',
 			array(&$this, '_doHeaders_callback_setext'), $text);
 
 		# atx-style headers:
 		#	# Header 1
 		#	## Header 2
 		#	## Header 2 with closing hashes ##
 		#	...
 		#	###### Header 6
 		#
 		$text = preg_replace_callback('{
 				^(\#{1,6})	# $1 = string of #\'s
 				[ ]*
 				(.+?)		# $2 = Header text
 				[ ]*
 				\#*			# optional closing #\'s (not counted)
 				\n+
 			}xm',
 			array(&$this, '_doHeaders_callback_atx'), $text);
 
 		return $text;
 	}
 	function _doHeaders_callback_setext($matches) {
 		# Terrible hack to check we haven't found an empty list item.
 		if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1]))
 			return $matches[0];
 
 		$level = $matches[2]{0} == '=' ? 1 : 2;
 		$block = "<h$level>".$this->runSpanGamut($matches[1])."</h$level>";
 		return "\n" . $this->hashBlock($block) . "\n\n";
 	}
 	function _doHeaders_callback_atx($matches) {
 		$level = strlen($matches[1]);
 		$block = "<h$level>".$this->runSpanGamut($matches[2])."</h$level>";
 		return "\n" . $this->hashBlock($block) . "\n\n";
 	}
 
 
 	function doLists($text) {
 	#
 	# Form HTML ordered (numbered) and unordered (bulleted) lists.
 	#
 		$less_than_tab = $this->tab_width - 1;
 
 		# Re-usable patterns to match list item bullets and number markers:
 		$marker_ul_re = '[*+-]';
 		$marker_ol_re = '\d+[\.]';
 		$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
 
 		$markers_relist = array(
 			$marker_ul_re => $marker_ol_re,
 			$marker_ol_re => $marker_ul_re,
 			);
 
 		foreach ($markers_relist as $marker_re => $other_marker_re) {
 			# Re-usable pattern to match any entirel ul or ol list:
 			$whole_list_re = '
 				(								# $1 = whole list
 				 (								# $2
 					([ ]{0,'.$less_than_tab.'})	# $3 = number of spaces
 					('.$marker_re.')			# $4 = first list item marker
 					[ ]+
 				 )
 				 (?s:.+?)
 				 (								# $5
 					 \z
 					|
 					 \n{2,}
 					 (?=\S)
 					 (?!						# Negative lookahead for another list item marker
 						[ ]*
 						'.$marker_re.'[ ]+
 					 )
 					|
 					 (?=						# Lookahead for another kind of list
 					 \n
 						\3						# Must have the same indentation
 						'.$other_marker_re.'[ ]+
 					 )
 				 )
 				)
 			'; // mx
 
 			# We use a different prefix before nested lists than top-level lists.
 			# See extended comment in _ProcessListItems().
 
 			if ($this->list_level) {
 				$text = preg_replace_callback('{
 						^
 						'.$whole_list_re.'
 					}mx',
 					array(&$this, '_doLists_callback'), $text);
 			}
 			else {
 				$text = preg_replace_callback('{
 						(?:(?<=\n)\n|\A\n?) # Must eat the newline
 						'.$whole_list_re.'
 					}mx',
 					array(&$this, '_doLists_callback'), $text);
 			}
 		}
 
 		return $text;
 	}
 	function _doLists_callback($matches) {
 		# Re-usable patterns to match list item bullets and number markers:
 		$marker_ul_re = '[*+-]';
 		$marker_ol_re = '\d+[\.]';
 		$marker_any_re = "(?:$marker_ul_re|$marker_ol_re)";
 
 		$list = $matches[1];
 		$list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol";
 
 		$marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re );
 
 		$list .= "\n";
 		$result = $this->processListItems($list, $marker_any_re);
 
 		$result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
 		return "\n". $result ."\n\n";
 	}
 
 	var $list_level = 0;
 
 	function processListItems($list_str, $marker_any_re) {
 	#
 	#	Process the contents of a single ordered or unordered list, splitting it
 	#	into individual list items.
 	#
 		# The $this->list_level global keeps track of when we're inside a list.
 		# Each time we enter a list, we increment it; when we leave a list,
 		# we decrement. If it's zero, we're not in a list anymore.
 		#
 		# We do this because when we're not inside a list, we want to treat
 		# something like this:
 		#
 		#		I recommend upgrading to version
 		#		8. Oops, now this line is treated
 		#		as a sub-list.
 		#
 		# As a single paragraph, despite the fact that the second line starts
 		# with a digit-period-space sequence.
 		#
 		# Whereas when we're inside a list (or sub-list), that line will be
 		# treated as the start of a sub-list. What a kludge, huh? This is
 		# an aspect of Markdown's syntax that's hard to parse perfectly
 		# without resorting to mind-reading. Perhaps the solution is to
 		# change the syntax rules such that sub-lists must start with a
 		# starting cardinal number; e.g. "1." or "a.".
 
 		$this->list_level++;
 
 		# trim trailing blank lines:
 		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
 
 		$list_str = preg_replace_callback('{
 			(\n)?							# leading line = $1
 			(^[ ]*)							# leading whitespace = $2
 			('.$marker_any_re.'				# list marker and space = $3
 				(?:[ ]+|(?=\n))	# space only required if item is not empty
 			)
 			((?s:.*?))						# list item text = $4
 			(?:(\n+(?=\n))|\n)				# tailing blank line = $5
 			(?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n))))
 			}xm',
 			array(&$this, '_processListItems_callback'), $list_str);
 
 		$this->list_level--;
 		return $list_str;
 	}
 	function _processListItems_callback($matches) {
 		$item = $matches[4];
 		$leading_line =& $matches[1];
 		$leading_space =& $matches[2];
 		$marker_space = $matches[3];
 		$tailing_blank_line =& $matches[5];
 
 		if ($leading_line || $tailing_blank_line || 
 			preg_match('/\n{2,}/', $item))
 		{
 			# Replace marker with the appropriate whitespace indentation
 			$item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item;
 			$item = $this->runBlockGamut($this->outdent($item)."\n");
 		}
 		else {
 			# Recursion for sub-lists:
 			$item = $this->doLists($this->outdent($item));
 			$item = preg_replace('/\n+$/', '', $item);
 			$item = $this->runSpanGamut($item);
 		}
 
 		return "<li>" . $item . "</li>\n";
 	}
 
 
 	function doCodeBlocks($text) {
 	#
 	#	Process Markdown `<pre><code>` blocks.
 	#
 		$text = preg_replace_callback('{
 				(?:\n\n|\A\n?)
 				(	 # $1 = the code block -- one or more lines, starting with a space/tab
 				 (?>
 					[ ]{'.$this->tab_width.'} # Lines must start with a tab or a tab-width of spaces
 					.*\n+
 				 )+
 				)
 				((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
 			}xm',
 			array(&$this, '_doCodeBlocks_callback'), $text);
 
 		return $text;
 	}
 	function _doCodeBlocks_callback($matches) {
 		$codeblock = $matches[1];
 
 		$codeblock = $this->outdent($codeblock);
 		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
 
 		# trim leading newlines and trailing newlines
 		$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
 
 		$codeblock = "<pre><code>$codeblock\n</code></pre>";
 		return "\n\n".$this->hashBlock($codeblock)."\n\n";
 	}
 
 
 	function makeCodeSpan($code) {
 	#
 	# Create a code span markup for $code. Called from handleSpanToken.
 	#
 		$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
 		return $this->hashPart("<code>$code</code>");
 	}
 
 
 	var $em_relist = array(
 		'' => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?=\S|$)(?![\.,:;]\s)',
 		'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
 		'_' => '(?<=\S|^)(?<!_)_(?!_)',
 		);
 	var $strong_relist = array(
 		'' => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?=\S|$)(?![\.,:;]\s)',
 		'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
 		'__' => '(?<=\S|^)(?<!_)__(?!_)',
 		);
 	var $em_strong_relist = array(
 		'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?=\S|$)(?![\.,:;]\s)',
 		'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
 		'___' => '(?<=\S|^)(?<!_)___(?!_)',
 		);
 	var $em_strong_prepared_relist;
 
 	function prepareItalicsAndBold() {
 	#
 	# Prepare regular expressions for searching emphasis tokens in any
 	# context.
 	#
 		foreach ($this->em_relist as $em => $em_re) {
 			foreach ($this->strong_relist as $strong => $strong_re) {
 				# Construct list of allowed token expressions.
 				$token_relist = array();
 				if (isset($this->em_strong_relist["$em$strong"])) {
 					$token_relist[] = $this->em_strong_relist["$em$strong"];
 				}
 				$token_relist[] = $em_re;
 				$token_relist[] = $strong_re;
 
 				# Construct master expression from list.
 				$token_re = '{('. implode('|', $token_relist) .')}';
 				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
 			}
 		}
 	}
 
 	function doItalicsAndBold($text) {
 		$token_stack = array('');
 		$text_stack = array('');
 		$em = '';
 		$strong = '';
 		$tree_char_em = false;
 
 		while (1) {
 			#
 			# Get prepared regular expression for seraching emphasis tokens
 			# in current context.
 			#
 			$token_re = $this->em_strong_prepared_relist["$em$strong"];
 
 			#
 			# Each loop iteration search for the next emphasis token. 
 			# Each token is then passed to handleSpanToken.
 			#
 			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
 			$text_stack[0] .= $parts[0];
 			$token =& $parts[1];
 			$text =& $parts[2];
 
 			if (empty($token)) {
 				# Reached end of text span: empty stack without emitting.
 				# any more emphasis.
 				while ($token_stack[0]) {
 					$text_stack[1] .= array_shift($token_stack);
 					$text_stack[0] .= array_shift($text_stack);
 				}
 				break;
 			}
 
 			$token_len = strlen($token);
 			if ($tree_char_em) {
 				# Reached closing marker while inside a three-char emphasis.
 				if ($token_len == 3) {
 					# Three-char closing marker, close em and strong.
 					array_shift($token_stack);
 					$span = array_shift($text_stack);
 					$span = $this->runSpanGamut($span);
 					$span = "$span";
 					$text_stack[0] .= $this->hashPart($span);
 					$em = '';
 					$strong = '';
 				} else {
 					# Other closing marker: close one em or strong and
 					# change current token state to match the other
 					$token_stack[0] = str_repeat($token{0}, 3-$token_len);
 					$tag = $token_len == 2 ? "strong" : "em";
 					$span = $text_stack[0];
 					$span = $this->runSpanGamut($span);
 					$span = "<$tag>$span</$tag>";
 					$text_stack[0] = $this->hashPart($span);
 					$$tag = ''; # $$tag stands for $em or $strong
 				}
 				$tree_char_em = false;
 			} else if ($token_len == 3) {
 				if ($em) {
 					# Reached closing marker for both em and strong.
 					# Closing strong marker:
 					for ($i = 0; $i < 2; ++$i) {
 						$shifted_token = array_shift($token_stack);
 						$tag = strlen($shifted_token) == 2 ? "strong" : "em";
 						$span = array_shift($text_stack);
 						$span = $this->runSpanGamut($span);
 						$span = "<$tag>$span</$tag>";
 						$text_stack[0] .= $this->hashPart($span);
 						$$tag = ''; # $$tag stands for $em or $strong
 					}
 				} else {
 					# Reached opening three-char emphasis marker. Push on token 
 					# stack; will be handled by the special condition above.
 					$em = $token{0};
 					$strong = "$em$em";
 					array_unshift($token_stack, $token);
 					array_unshift($text_stack, '');
 					$tree_char_em = true;
 				}
 			} else if ($token_len == 2) {
 				if ($strong) {
 					# Unwind any dangling emphasis marker:
 					if (strlen($token_stack[0]) == 1) {
 						$text_stack[1] .= array_shift($token_stack);
 						$text_stack[0] .= array_shift($text_stack);
 					}
 					# Closing strong marker:
 					array_shift($token_stack);
 					$span = array_shift($text_stack);
 					$span = $this->runSpanGamut($span);
 					$span = "$span";
 					$text_stack[0] .= $this->hashPart($span);
 					$strong = '';
 				} else {
 					array_unshift($token_stack, $token);
 					array_unshift($text_stack, '');
 					$strong = $token;
 				}
 			} else {
 				# Here $token_len == 1
 				if ($em) {
 					if (strlen($token_stack[0]) == 1) {
 						# Closing emphasis marker:
 						array_shift($token_stack);
 						$span = array_shift($text_stack);
 						$span = $this->runSpanGamut($span);
 						$span = "$span";
 						$text_stack[0] .= $this->hashPart($span);
 						$em = '';
 					} else {
 						$text_stack[0] .= $token;
 					}
 				} else {
 					array_unshift($token_stack, $token);
 					array_unshift($text_stack, '');
 					$em = $token;
 				}
 			}
 		}
 		return $text_stack[0];
 	}
 
 
 	function doBlockQuotes($text) {
 		$text = preg_replace_callback('/
 			 (								# Wrap whole match in $1
 				(?>
 				 ^[ ]*>[ ]?			# ">" at the start of a line
 					.+\n					# rest of the first line
 				 (.+\n)*					# subsequent consecutive lines
 				 \n*						# blanks
 				)+
 			 )
 			/xm',
 			array(&$this, '_doBlockQuotes_callback'), $text);
 
 		return $text;
 	}
 	function _doBlockQuotes_callback($matches) {
 		$bq = $matches[1];
 		# trim one level of quoting - trim whitespace-only lines
 		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
 		$bq = $this->runBlockGamut($bq);		# recurse
 
 		$bq = preg_replace('/^/m', " ", $bq);
 		# These leading spaces cause problem with <pre> content, 
 		# so we need to fix that:
 		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
 			array(&$this, '_doBlockQuotes_callback2'), $bq);
 
 		return "\n". $this->hashBlock("<blockquote>\n$bq\n</blockquote>")."\n\n";
 	}
 	function _doBlockQuotes_callback2($matches) {
 		$pre = $matches[1];
 		$pre = preg_replace('/^ /m', '', $pre);
 		return $pre;
 	}
 
 
 	function formParagraphs($text) {
 	#
 	#	Params:
 	#		$text - string to process with html tags
 	#
 		# Strip leading and trailing lines:
 		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
 
 		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
 
 		#
 		# Wrap tags and unhashify HTML blocks
 		#
 		foreach ($grafs as $key => $value) {
 			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
 				# Is a paragraph.
 				$value = $this->runSpanGamut($value);
 				$value = preg_replace('/^([ ]*)/', "", $value);
 				$value .= "";
 				$grafs[$key] = $this->unhash($value);
 			}
 			else {
 				# Is a block.
 				# Modify elements of @grafs in-place...
 				$graf = $value;
 				$block = $this->html_hashes[$graf];
 				$graf = $block;
 //				if (preg_match('{
 //					\A
 //					(							# $1 = <div> tag
 //					 <div \s+
 //					 [^>]*
 //					 \b
 //					 markdown\s*=\s* ([\'"])	#	$2 = attr quote char
 //					 1
 //					 \2
 //					 [^>]*
 //					 >
 //					)
 //					(							# $3 = contents
 //					.*
 //					)
 //					(</div>)					# $4 = closing tag
 //					\z
 //					}xs', $block, $matches))
 //				{
 //					list(, $div_open, , $div_content, $div_close) = $matches;
 //
 //					# We can't call Markdown(), because that resets the hash;
 //					# that initialization code should be pulled into its own sub, though.
 //					$div_content = $this->hashHTMLBlocks($div_content);
 //					
 //					# Run document gamut methods on the content.
 //					foreach ($this->document_gamut as $method => $priority) {
 //						$div_content = $this->$method($div_content);
 //					}
 //
 //					$div_open = preg_replace(
 //						'{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
 //
 //					$graf = $div_open . "\n" . $div_content . "\n" . $div_close;
 //				}
 				$grafs[$key] = $graf;
 			}
 		}
 
 		return implode("\n\n", $grafs);
 	}
 
 
 	function encodeAttribute($text) {
 	#
 	# Encode text for a double-quoted HTML attribute. This function
 	# is *not* suitable for attributes enclosed in single quotes.
 	#
 		$text = $this->encodeAmpsAndAngles($text);
 		$text = str_replace('"', '&quot;', $text);
 		return $text;
 	}
 
 
 	function encodeAmpsAndAngles($text) {
 	#
 	# Smart processing for ampersands and angle brackets that need to 
 	# be encoded. Valid character entities are left alone unless the
 	# no-entities mode is set.
 	#
 		if ($this->no_entities) {
 			$text = str_replace('&', '&amp;', $text);
 		} else {
 			# Ampersand-encoding based entirely on Nat Irons's Amputator
 			# MT plugin: <http://bumppo.net/projects/amputator/>
 			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/', 
 								'&amp;', $text);;
 		}
 		# Encode remaining <'s
 		$text = str_replace('<', '&lt;', $text);
 
 		return $text;
 	}
 
 
 	function doAutoLinks($text) {
 		$text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}i', 
 			array(&$this, '_doAutoLinks_url_callback'), $text);
 
 		# Email addresses: <address@domain.foo>
 		$text = preg_replace_callback('{
 			<
 			(?:mailto:)?
 			(
 				(?:
 					[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
 				|
 					".*?"
 				)
 				\@
 				(?:
 					[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
 				|
 					\[[\d.a-fA-F:]+\]	# IPv4 & IPv6
 				)
 			)
 			>
 			}xi',
 			array(&$this, '_doAutoLinks_email_callback'), $text);
 
 		return $text;
 	}
 	function _doAutoLinks_url_callback($matches) {
 		$url = $this->encodeAttribute($matches[1]);
 		$link = "<a href=\"$url\">$url</a>";
 		return $this->hashPart($link);
 	}
 	function _doAutoLinks_email_callback($matches) {
 		$address = $matches[1];
 		$link = $this->encodeEmailAddress($address);
 		return $this->hashPart($link);
 	}
 
 
 	function encodeEmailAddress($addr) {
 	#
 	#	Input: an email address, e.g. "foo@example.com"
 	#
 	#	Output: the email address as a mailto link, with each character
 	#		of the address encoded as either a decimal or hex entity, in
 	#		the hopes of foiling most address harvesting spam bots. E.g.:
 	#
 	#	 <a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#x66;o&#111;
 	# &#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;&#101;&#46;&#x63;&#111;
 	# &#x6d;">&#x66;o&#111;&#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;
 	# &#101;&#46;&#x63;&#111;&#x6d;</a>
 	#
 	#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
 	# With some optimizations by Milian Wolff.
 	#
 		$addr = "mailto:" . $addr;
 		$chars = preg_split('/(?<!^)(?!$)/', $addr);
 		$seed = (int)abs(crc32($addr) / strlen($addr)); # Deterministic seed.
 
 		foreach ($chars as $key => $char) {
 			$ord = ord($char);
 			# Ignore non-ascii chars.
 			if ($ord < 128) {
 				$r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
 				# roughly 10% raw, 45% hex, 45% dec
 				# '@' *must* be encoded. I insist.
 				if ($r > 90 && $char != '@') /* do nothing */;
 				else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
 				else $chars[$key] = '&#'.$ord.';';
 			}
 		}
 
 		$addr = implode('', $chars);
 		$text = implode('', array_slice($chars, 7)); # text without `mailto:`
 		$addr = "<a href=\"$addr\">$text</a>";
 
 		return $addr;
 	}
 
 
 	function parseSpan($str) {
 	#
 	# Take the string $str and parse it into tokens, hashing embeded HTML,
 	# escaped characters and handling code spans.
 	#
 		$output = '';
 
 		$span_re = '{
 				(
 					\\\\'.$this->escape_chars_re.'
 				|
 					(?<![`\\\\])
 					`+						# code span marker
 			'.( $this->no_markup ? '' : '
 				|
 							# comment
 				|
 					<\?.*?\?> | <%.*?%>		# processing instruction
 				|
 					<[!$]?[-a-zA-Z0-9:_]+	# regular tags
 					(?>
 						\s
 						(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
 					)?
 					>
 				|
 					<[-a-zA-Z0-9:_]+\s*/> # xml-style empty tag
 				|
 					</[-a-zA-Z0-9:_]+\s*> # closing tag
 			').'
 				)
 				}xs';
 
 		while (1) {
 			#
 			# Each loop iteration seach for either the next tag, the next 
 			# openning code span marker, or the next escaped character. 
 			# Each token is then passed to handleSpanToken.
 			#
 			$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
 
 			# Create token from text preceding tag.
 			if ($parts[0] != "") {
 				$output .= $parts[0];
 			}
 
 			# Check if we reach the end.
 			if (isset($parts[1])) {
 				$output .= $this->handleSpanToken($parts[1], $parts[2]);
 				$str = $parts[2];
 			}
 			else {
 				break;
 			}
 		}
 
 		return $output;
 	}
 
 
 	function handleSpanToken($token, &$str) {
 	#
 	# Handle $token provided by parseSpan by determining its nature and 
 	# returning the corresponding value that should replace it.
 	#
 		switch ($token{0}) {
 			case "\\":
 				return $this->hashPart("&#". ord($token{1}). ";");
 			case "`":
 				# Search for end marker in remaining text.
 				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm', 
 					$str, $matches))
 				{
 					$str = $matches[2];
 					$codespan = $this->makeCodeSpan($matches[1]);
 					return $this->hashPart($codespan);
 				}
 				return $token; // return as text since no ending marker found.
 			default:
 				return $this->hashPart($token);
 		}
 	}
 
 
 	function outdent($text) {
 	#
 	# Remove one level of line-leading tabs or spaces
 	#
 		return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
 	}
 
 
 	# String length function for detab. `_initDetab` will create a function to 
 	# hanlde UTF-8 if the default function does not exist.
 	var $utf8_strlen = 'mb_strlen';
 
 	function detab($text) {
 	#
 	# Replace tabs with the appropriate amount of space.
 	#
 		# For each line we separate the line in blocks delemited by
 		# tab characters. Then we reconstruct every line by adding the 
 		# appropriate number of space between each blocks.
 
 		$text = preg_replace_callback('/^.*\t.*$/m',
 			array(&$this, '_detab_callback'), $text);
 
 		return $text;
 	}
 	function _detab_callback($matches) {
 		$line = $matches[0];
 		$strlen = $this->utf8_strlen; # strlen function for UTF-8.
 
 		# Split in blocks.
 		$blocks = explode("\t", $line);
 		# Add each blocks to the line.
 		$line = $blocks[0];
 		unset($blocks[0]); # Do not add first block twice.
 		foreach ($blocks as $block) {
 			# Calculate amount of space, insert spaces, insert block.
 			$amount = $this->tab_width - 
 				$strlen($line, 'UTF-8') % $this->tab_width;
 			$line .= str_repeat(" ", $amount) . $block;
 		}
 		return $line;
 	}
 	function _initDetab() {
 	#
 	# Check for the availability of the function in the `utf8_strlen` property
 	# (initially `mb_strlen`). If the function is not available, create a 
 	# function that will loosely count the number of UTF-8 characters with a
 	# regular expression.
 	#
 		if (function_exists($this->utf8_strlen)) return;
 		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
 			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/", 
 			$text, $m);');
 	}
 
 
 	function unhash($text) {
 	#
 	# Swap back in all the tags hashed by _HashHTMLBlocks.
 	#
 		return preg_replace_callback('/(.)\x1A[0-9]+\1/', 
 			array(&$this, '_unhash_callback'), $text);
 	}
 	function _unhash_callback($matches) {
 		return $this->html_hashes[$matches[0]];
 	}
 
 }
 
 
 #
 # Temporary Markdown Extra Parser Implementation Class
 #
 # NOTE: DON'T USE THIS CLASS
 # Currently the implementation of of Extra resides here in this temporary class.
 # This makes it easier to propagate the changes between the three different
 # packaging styles of PHP Markdown. When this issue is resolved, this
 # MarkdownExtra_TmpImpl class here will disappear and \Michelf\MarkdownExtra
 # will contain the code. So please use \Michelf\MarkdownExtra and ignore this
 # one.
 #
 
 class _MarkdownExtra_TmpImpl extends \Michelf\Markdown {
 
 	### Configuration Variables ###
 
 	# Prefix for footnote ids.
 	var $fn_id_prefix = "";
 
 	# Optional title attribute for footnote links and backlinks.
 	var $fn_link_title = "";
 	var $fn_backlink_title = "";
 
 	# Optional class attribute for footnote links and backlinks.
 	var $fn_link_class = "footnote-ref";
 	var $fn_backlink_class = "footnote-backref";
 
 	# Optional class prefix for fenced code block.
 	var $code_class_prefix = "";
 	# Class attribute for code blocks goes on the `code` tag;
 	# setting this to true will put attributes on the `pre` tag instead.
 	var $code_attr_on_pre = false;
 
 	# Predefined abbreviations.
 	var $predef_abbr = array();
 
 
 	### Parser Implementation ###
 
 	function __construct() {
 	#
 	# Constructor function. Initialize the parser object.
 	#
 		# Add extra escapable characters before parent constructor 
 		# initialize the table.
 		$this->escape_chars .= ':|';
 
 		# Insert extra document, block, and span transformations. 
 		# Parent constructor will do the sorting.
 		$this->document_gamut += array(
 			"doFencedCodeBlocks" => 5,
 			"stripFootnotes" => 15,
 			"stripAbbreviations" => 25,
 			"appendFootnotes" => 50,
 			);
 		$this->block_gamut += array(
 			"doFencedCodeBlocks" => 5,
 			"doTables" => 15,
 			"doDefLists" => 45,
 			);
 		$this->span_gamut += array(
 			"doFootnotes" => 5,
 			"doAbbreviations" => 70,
 			);
 
 		parent::__construct();
 	}
 
 
 	# Extra variables used during extra transformations.
 	var $footnotes = array();
 	var $footnotes_ordered = array();
 	var $footnotes_ref_count = array();
 	var $footnotes_numbers = array();
 	var $abbr_desciptions = array();
 	var $abbr_word_re = '';
 
 	# Give the current footnote number.
 	var $footnote_counter = 1;
 
 
 	function setup() {
 	#
 	# Setting up Extra-specific variables.
 	#
 		parent::setup();
 
 		$this->footnotes = array();
 		$this->footnotes_ordered = array();
 		$this->footnotes_ref_count = array();
 		$this->footnotes_numbers = array();
 		$this->abbr_desciptions = array();
 		$this->abbr_word_re = '';
 		$this->footnote_counter = 1;
 
 		foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
 			if ($this->abbr_word_re)
 				$this->abbr_word_re .= '|';
 			$this->abbr_word_re .= preg_quote($abbr_word);
 			$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
 		}
 	}
 
 	function teardown() {
 	#
 	# Clearing Extra-specific variables.
 	#
 		$this->footnotes = array();
 		$this->footnotes_ordered = array();
 		$this->footnotes_ref_count = array();
 		$this->footnotes_numbers = array();
 		$this->abbr_desciptions = array();
 		$this->abbr_word_re = '';
 
 		parent::teardown();
 	}
 
 
 	### Extra Attribute Parser ###
 
 	# Expression to use to catch attributes (includes the braces)
 	var $id_class_attr_catch_re = '\{((?:[ ]*[#.][-_:a-zA-Z0-9]+){1,})[ ]*\}';
 	# Expression to use when parsing in a context when no capture is desired
 	var $id_class_attr_nocatch_re = '\{(?:[ ]*[#.][-_:a-zA-Z0-9]+){1,}[ ]*\}';
 
 	function doExtraAttributes($tag_name, $attr) {
 	#
 	# Parse attributes caught by the $this->id_class_attr_catch_re expression
 	# and return the HTML-formatted list of attributes.
 	#
 	# Currently supported attributes are .class and #id.
 	#
 		if (empty($attr)) return "";
 
 		# Split on components
 		preg_match_all('/[#.][-_:a-zA-Z0-9]+/', $attr, $matches);
 		$elements = $matches[0];
 
 		# handle classes and ids (only first id taken into account)
 		$classes = array();
 		$id = false;
 		foreach ($elements as $element) {
 			if ($element{0} == '.') {
 				$classes[] = substr($element, 1);
 			} else if ($element{0} == '#') {
 				if ($id === false) $id = substr($element, 1);
 			}
 		}
 
 		# compose attributes as string
 		$attr_str = "";
 		if (!empty($id)) {
 			$attr_str .= ' id="'.$id.'"';
 		}
 		if (!empty($classes)) {
 			$attr_str .= ' class="'.implode(" ", $classes).'"';
 		}
 		return $attr_str;
 	}
 
 
 	### HTML Block Parser ###
 
 	# Tags that are always treated as block tags:
 	var $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption';
 
 	# Tags treated as block tags only if the opening tag is alone on its line:
 	var $context_block_tags_re = 'script|noscript|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
 
 	# Tags where markdown="1" default to span mode:
 	var $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
 
 	# Tags which must not have their contents modified, no matter where 
 	# they appear:
 	var $clean_tags_re = 'script|math|svg';
 
 	# Tags that do not need to be closed.
 	var $auto_close_tags_re = 'hr|img|param|source|track';
 
 
 	function hashHTMLBlocks($text) {
 	#
 	# Hashify HTML Blocks and "clean tags".
 	#
 	# We only want to do this for block-level HTML tags, such as headers,
 	# lists, and tables. That's because we still want to wrap s around
 	# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
 	# phrase emphasis, and spans. The list of tags we're looking for is
 	# hard-coded.
 	#
 	# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
 	# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1" 
 	# attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
 	# _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
 	# These two functions are calling each other. It's recursive!
 	#
 		if ($this->no_markup) return $text;
 
 		#
 		# Call the HTML-in-Markdown hasher.
 		#
 		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
 
 		return $text;
 	}
 	function _hashHTMLBlocks_inMarkdown($text, $indent = 0, 
 										$enclosing_tag_re = '', $span = false)
 	{
 	#
 	# Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
 	#
 	# * $indent is the number of space to be ignored when checking for code 
 	# blocks. This is important because if we don't take the indent into 
 	# account, something like this (which looks right) won't work as expected:
 	#
 	# <div>
 	# <div markdown="1">
 	# Hello World. <-- Is this a Markdown code block or text?
 	# </div> <-- Is this a Markdown code block or a real tag?
 	# <div>
 	#
 	# If you don't like this, just don't indent the tag on which
 	# you apply the markdown="1" attribute.
 	#
 	# * If $enclosing_tag_re is not empty, stops at the first unmatched closing 
 	# tag with that name. Nested tags supported.
 	#
 	# * If $span is true, text inside must treated as span. So any double 
 	# newline will be replaced by a single newline so that it does not create 
 	# paragraphs.
 	#
 	# Returns an array of that form: ( processed text , remaining text )
 	#
 		if ($text === '') return array('', '');
 
 		# Regex to check for the presense of newlines around a block tag.
 		$newline_before_re = '/(?:^\n?|\n\n)*$/';
 		$newline_after_re = 
 			'{
 				^						# Start of text following the tag.
 				(?>[ ]*)?		# Optional comment.
 				[ ]*\n					# Must be followed by newline.
 			}xs';
 
 		# Regex to match any tag.
 		$block_tag_re =
 			'{
 				(					# $2: Capture whole tag.
 					</?					# Any opening or closing tag.
 						(?>				# Tag name.
 							'.$this->block_tags_re.'			|
 							'.$this->context_block_tags_re.'	|
 							'.$this->clean_tags_re.' 	|
 							(?!\s)'.$enclosing_tag_re.'
 						)
 						(?:
 							(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
 							(?>
 								".*?"		|	# Double quotes (can contain `>`)
 								\'.*?\' 	|	# Single quotes (can contain `>`)
 								.+?				# Anything but quotes and `>`.
 							)*?
 						)?
 					>					# End of tag.
 				|
 						# HTML Comment
 				|
 					<\?.*?\?> | <%.*?%>	# Processing instruction
 				|
 					<!\[CDATA\[.*?\]\]>	# CData Block
 				|
 					# Code span marker
 					`+
 				'. ( !$span ? ' # If not in span.
 				|
 					# Indented code block
 					(?: ^[ ]*\n | ^ | \n[ ]*\n )
 					[ ]{'.($indent+4).'}[^\n]* \n
 					(?>
 						(?: [ ]{'.($indent+4).'}[^\n]* | [ ]* ) \n
 					)*
 				|
 					# Fenced code block marker
 					(?<= ^ | \n )
 					[ ]{0,'.($indent+3).'}~{3,}
 									[ ]*
 					(?:
 					\.?[-_:a-zA-Z0-9]+ # standalone class name
 					|
 						'.$this->id_class_attr_nocatch_re.' # extra attributes
 					)?
 					[ ]*
 					\n
 				' : '' ). ' # End (if not is span).
 				)
 			}xs';
 
 
 		$depth = 0;		# Current depth inside the tag tree.
 		$parsed = "";	# Parsed text that will be returned.
 
 		#
 		# Loop through every tag until we find the closing tag of the parent
 		# or loop until reaching the end of text if no parent tag specified.
 		#
 		do {
 			#
 			# Split the text using the first $tag_match pattern found.
 			# Text before pattern will be first in the array, text after
 			# pattern will be at the end, and between will be any catches made 
 			# by the pattern.
 			#
 			$parts = preg_split($block_tag_re, $text, 2, 
 								PREG_SPLIT_DELIM_CAPTURE);
 
 			# If in Markdown span mode, add a empty-string span-level hash 
 			# after each newline to prevent triggering any block element.
 			if ($span) {
 				$void = $this->hashPart("", ':');
 				$newline = "$void\n";
 				$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
 			}
 
 			$parsed .= $parts[0]; # Text before current tag.
 
 			# If end of $text has been reached. Stop loop.
 			if (count($parts) < 3) {
 				$text = "";
 				break;
 			}
 
 			$tag = $parts[1]; # Tag to handle.
 			$text = $parts[2]; # Remaining text after current tag.
 			$tag_re = preg_quote($tag); # For use in a regular expression.
 
 			#
 			# Check for: Code span marker
 			#
 			if ($tag{0} == "`") {
 				# Find corresponding end marker.
 				$tag_re = preg_quote($tag);
 				if (preg_match('{^(?>.+?|\n(?!\n))*?(?<!`)'.$tag_re.'(?!`)}',
 					$text, $matches))
 				{
 					# End marker found: pass text unchanged until marker.
 					$parsed .= $tag . $matches[0];
 					$text = substr($text, strlen($matches[0]));
 				}
 				else {
 					# Unmatched marker: just skip it.
 					$parsed .= $tag;
 				}
 			}
 			#
 			# Check for: Fenced code block marker.
 			#
 			else if (preg_match('{^\n?([ ]{0,'.($indent+3).'})(~+)}', $tag, $capture)) {
 				# Fenced code block marker: find matching end marker.
 				$fence_indent = strlen($capture[1]); # use captured indent in re
 				$fence_re = $capture[2]; # use captured fence in re
 				if (preg_match('{^(?>.*\n)*?[ ]{'.($fence_indent).'}'.$fence_re.'[ ]*(?:\n|$)}', $text,
 					$matches)) 
 				{
 					# End marker found: pass text unchanged until marker.
 					$parsed .= $tag . $matches[0];
 					$text = substr($text, strlen($matches[0]));
 				}
 				else {
 					# No end marker: just skip it.
 					$parsed .= $tag;
 				}
 			}
 			#
 			# Check for: Indented code block.
 			#
 			else if ($tag{0} == "\n" || $tag{0} == " ") {
 				# Indented code block: pass it unchanged, will be handled 
 				# later.
 				$parsed .= $tag;
 			}
 			#
 			# Check for: Opening Block level tag or
 			# Opening Context Block tag (like ins and del) 
 			# used as a block tag (tag is alone on it's line).
 			#
 			else if (preg_match('{^<(?:'.$this->block_tags_re.')\b}', $tag) ||
 				(	preg_match('{^<(?:'.$this->context_block_tags_re.')\b}', $tag) &&
 					preg_match($newline_before_re, $parsed) &&
 					preg_match($newline_after_re, $text)	)
 				)
 			{
 				# Need to parse tag and following text using the HTML parser.
 				list($block_text, $text) = 
 					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
 
 				# Make sure it stays outside of any paragraph by adding newlines.
 				$parsed .= "\n\n$block_text\n\n";
 			}
 			#
 			# Check for: Clean tag (like script, math)
 			# HTML Comments, processing instructions.
 			#
 			else if (preg_match('{^<(?:'.$this->clean_tags_re.')\b}', $tag) ||
 				$tag{1} == '!' || $tag{1} == '?')
 			{
 				# Need to parse tag and following text using the HTML parser.
 				# (don't check for markdown attribute)
 				list($block_text, $text) = 
 					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
 
 				$parsed .= $block_text;
 			}
 			#
 			# Check for: Tag with same name as enclosing tag.
 			#
 			else if ($enclosing_tag_re !== '' &&
 				# Same name as enclosing tag.
 				preg_match('{^</?(?:'.$enclosing_tag_re.')\b}', $tag))
 			{
 				#
 				# Increase/decrease nested tag count.
 				#
 				if ($tag{1} == '/')						$depth--;
 				else if ($tag{strlen($tag)-2} != '/')	$depth++;
 
 				if ($depth < 0) {
 					#
 					# Going out of parent element. Clean up and break so we
 					# return to the calling function.
 					#
 					$text = $tag . $text;
 					break;
 				}
 
 				$parsed .= $tag;
 			}
 			else {
 				$parsed .= $tag;
 			}
 		} while ($depth >= 0);
 
 		return array($parsed, $text);
 	}
 	function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
 	#
 	# Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
 	#
 	# * Calls $hash_method to convert any blocks.
 	# * Stops when the first opening tag closes.
 	# * $md_attr indicate if the use of the `markdown="1"` attribute is allowed.
 	# (it is not inside clean tags)
 	#
 	# Returns an array of that form: ( processed text , remaining text )
 	#
 		if ($text === '') return array('', '');
 
 		# Regex to match `markdown` attribute inside of a tag.
 		$markdown_attr_re = '
 			{
 				\s*			# Eat whitespace before the `markdown` attribute
 				markdown
 				\s*=\s*
 				(?>
 					(["\'])		# $1: quote delimiter		
 					(.*?)		# $2: attribute value
 					\1			# matching delimiter	
 				|
 					([^\s>]*)	# $3: unquoted attribute value
 				)
 				()				# $4: make $3 always defined (avoid warnings)
 			}xs';
 
 		# Regex to match any tag.
 		$tag_re = '{
 				(					# $2: Capture whole tag.
 					</?					# Any opening or closing tag.
 						[\w:$]+			# Tag name.
 						(?:
 							(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
 							(?>
 								".*?"		|	# Double quotes (can contain `>`)
 								\'.*?\' 	|	# Single quotes (can contain `>`)
 								.+?				# Anything but quotes and `>`.
 							)*?
 						)?
 					>					# End of tag.
 				|
 						# HTML Comment
 				|
 					<\?.*?\?> | <%.*?%>	# Processing instruction
 				|
 					<!\[CDATA\[.*?\]\]>	# CData Block
 				)
 			}xs';
 
 		$original_text = $text;		# Save original text in case of faliure.
 
 		$depth		= 0;	# Current depth inside the tag tree.
 		$block_text	= "";	# Temporary text holder for current text.
 		$parsed		= "";	# Parsed text that will be returned.
 
 		#
 		# Get the name of the starting tag.
 		# (This pattern makes $base_tag_name_re safe without quoting.)
 		#
 		if (preg_match('/^<([\w:$]*)\b/', $text, $matches))
 			$base_tag_name_re = $matches[1];
 
 		#
 		# Loop through every tag until we find the corresponding closing tag.
 		#
 		do {
 			#
 			# Split the text using the first $tag_match pattern found.
 			# Text before pattern will be first in the array, text after
 			# pattern will be at the end, and between will be any catches made 
 			# by the pattern.
 			#
 			$parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
 
 			if (count($parts) < 3) {
 				#
 				# End of $text reached with unbalenced tag(s).
 				# In that case, we return original text unchanged and pass the
 				# first character as filtered to prevent an infinite loop in the 
 				# parent function.
 				#
 				return array($original_text{0}, substr($original_text, 1));
 			}
 
 			$block_text .= $parts[0]; # Text before current tag.
 			$tag = $parts[1]; # Tag to handle.
 			$text = $parts[2]; # Remaining text after current tag.
 
 			#
 			# Check for: Auto-close tag (like <hr/>)
 			#			 Comments and Processing Instructions.
 			#
 			if (preg_match('{^</?(?:'.$this->auto_close_tags_re.')\b}', $tag) ||
 				$tag{1} == '!' || $tag{1} == '?')
 			{
 				# Just add the tag to the block as if it was text.
 				$block_text .= $tag;
 			}
 			else {
 				#
 				# Increase/decrease nested tag count. Only do so if
 				# the tag's name match base tag's.
 				#
 				if (preg_match('{^</?'.$base_tag_name_re.'\b}', $tag)) {
 					if ($tag{1} == '/')						$depth--;
 					else if ($tag{strlen($tag)-2} != '/')	$depth++;
 				}
 
 				#
 				# Check for `markdown="1"` attribute and handle it.
 				#
 				if ($md_attr && 
 					preg_match($markdown_attr_re, $tag, $attr_m) &&
 					preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3]))
 				{
 					# Remove `markdown` attribute from opening tag.
 					$tag = preg_replace($markdown_attr_re, '', $tag);
 
 					# Check if text inside this tag must be parsed in span mode.
 					$this->mode = $attr_m[2] . $attr_m[3];
 					$span_mode = $this->mode == 'span' || $this->mode != 'block' &&
 						preg_match('{^<(?:'.$this->contain_span_tags_re.')\b}', $tag);
 
 					# Calculate indent before tag.
 					if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) {
 						$strlen = $this->utf8_strlen;
 						$indent = $strlen($matches[1], 'UTF-8');
 					} else {
 						$indent = 0;
 					}
 
 					# End preceding block with this tag.
 					$block_text .= $tag;
 					$parsed .= $this->$hash_method($block_text);
 
 					# Get enclosing tag name for the ParseMarkdown function.
 					# (This pattern makes $tag_name_re safe without quoting.)
 					preg_match('/^<([\w:$]*)\b/', $tag, $matches);
 					$tag_name_re = $matches[1];
 
 					# Parse the content using the HTML-in-Markdown parser.
 					list ($block_text, $text)
 						= $this->_hashHTMLBlocks_inMarkdown($text, $indent, 
 							$tag_name_re, $span_mode);
 
 					# Outdent markdown text.
 					if ($indent > 0) {
 						$block_text = preg_replace("/^[ ]{1,$indent}/m", "", 
 													$block_text);
 					}
 
 					# Append tag content to parsed text.
 					if (!$span_mode)	$parsed .= "\n\n$block_text\n\n";
 					else				$parsed .= "$block_text";
 
 					# Start over with a new block.
 					$block_text = "";
 				}
 				else $block_text .= $tag;
 			}
 
 		} while ($depth > 0);
 
 		#
 		# Hash last block text that wasn't processed inside the loop.
 		#
 		$parsed .= $this->$hash_method($block_text);
 
 		return array($parsed, $text);
 	}
 
 
 	function hashClean($text) {
 	#
 	# Called whenever a tag must be hashed when a function inserts a "clean" tag
 	# in $text, it passes through this function and is automaticaly escaped, 
 	# blocking invalid nested overlap.
 	#
 		return $this->hashPart($text, 'C');
 	}
 
 
 	function doHeaders($text) {
 	#
 	# Redefined to add id and class attribute support.
 	#
 		# Setext-style headers:
 		#	 Header 1 {#header1}
 		#	 ========
 		# 
 		#	 Header 2 {#header2 .class1 .class2}
 		#	 --------
 		#
 		$text = preg_replace_callback(
 			'{
 				(^.+?)								# $1: Header text
 				(?:[ ]+ '.$this->id_class_attr_catch_re.' )?	 # $3 = id/class attributes
 				[ ]*\n(=+|-+)[ ]*\n+				# $3: Header footer
 			}mx',
 			array(&$this, '_doHeaders_callback_setext'), $text);
 
 		# atx-style headers:
 		#	# Header 1 {#header1}
 		#	## Header 2 {#header2}
 		#	## Header 2 with closing hashes ## {#header3.class1.class2}
 		#	...
 		#	###### Header 6 {.class2}
 		#
 		$text = preg_replace_callback('{
 				^(\#{1,6})	# $1 = string of #\'s
 				[ ]*
 				(.+?)		# $2 = Header text
 				[ ]*
 				\#*			# optional closing #\'s (not counted)
 				(?:[ ]+ '.$this->id_class_attr_catch_re.' )?	 # $3 = id/class attributes
 				[ ]*
 				\n+
 			}xm',
 			array(&$this, '_doHeaders_callback_atx'), $text);
 
 		return $text;
 	}
 	function _doHeaders_callback_setext($matches) {
 		if ($matches[3] == '-' && preg_match('{^- }', $matches[1]))
 			return $matches[0];
 		$level = $matches[3]{0} == '=' ? 1 : 2;
 		$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[2]);
 		$block = "<h$level$attr>".$this->runSpanGamut($matches[1])."</h$level>";
 		return "\n" . $this->hashBlock($block) . "\n\n";
 	}
 	function _doHeaders_callback_atx($matches) {
 		$level = strlen($matches[1]);
 		$attr = $this->doExtraAttributes("h$level", $dummy =& $matches[3]);
 		$block = "<h$level$attr>".$this->runSpanGamut($matches[2])."</h$level>";
 		return "\n" . $this->hashBlock($block) . "\n\n";
 	}
 
 
 	function doTables($text) {
 	#
 	# Form HTML tables.
 	#
 		$less_than_tab = $this->tab_width - 1;
 		#
 		# Find tables with leading pipe.
 		#
 		#	| Header 1 | Header 2
 		#	| -------- | --------
 		#	| Cell 1 | Cell 2
 		#	| Cell 3 | Cell 4
 		#
 		$text = preg_replace_callback('
 			{
 				^							# Start of a line
 				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
 				[|]							# Optional leading pipe (present)
 				(.+) \n						# $1: Header row (at least one pipe)
 				
 				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
 				[|] ([ ]*[-:]+[-| :]*) \n	# $2: Header underline
 				
 				(							# $3: Cells
 					(?>
 						[ ]*				# Allowed whitespace.
 						[|] .* \n			# Row content.
 					)*
 				)
 				(?=\n|\Z)					# Stop at final double newline.
 			}xm',
 			array(&$this, '_doTable_leadingPipe_callback'), $text);
 
 		#
 		# Find tables without leading pipe.
 		#
 		#	Header 1 | Header 2
 		#	-------- | --------
 		#	Cell 1 | Cell 2
 		#	Cell 3 | Cell 4
 		#
 		$text = preg_replace_callback('
 			{
 				^							# Start of a line
 				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
 				(\S.*[|].*) \n				# $1: Header row (at least one pipe)
 				
 				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
 				([-:]+[ ]*[|][-| :]*) \n	# $2: Header underline
 				
 				(							# $3: Cells
 					(?>
 						.* [|] .* \n		# Row content
 					)*
 				)
 				(?=\n|\Z)					# Stop at final double newline.
 			}xm',
 			array(&$this, '_DoTable_callback'), $text);
 
 		return $text;
 	}
 	function _doTable_leadingPipe_callback($matches) {
 		$head		= $matches[1];
 		$underline	= $matches[2];
 		$content	= $matches[3];
 
 		# Remove leading pipe for each row.
 		$content	= preg_replace('/^ *[|]/m', '', $content);
 
 		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
 	}
 	function _doTable_callback($matches) {
 		$head		= $matches[1];
 		$underline	= $matches[2];
 		$content	= $matches[3];
 
 		# Remove any tailing pipes for each line.
 		$head		= preg_replace('/[|] *$/m', '', $head);
 		$underline	= preg_replace('/[|] *$/m', '', $underline);
 		$content	= preg_replace('/[|] *$/m', '', $content);
 
 		# Reading alignement from header underline.
 		$separators	= preg_split('/ *[|] */', $underline);
 		foreach ($separators as $n => $s) {
 			if (preg_match('/^ *-+: *$/', $s))		$attr[$n] = ' align="right"';
 			else if (preg_match('/^ *:-+: *$/', $s))$attr[$n] = ' align="center"';
 			else if (preg_match('/^ *:-+ *$/', $s))	$attr[$n] = ' align="left"';
 			else									$attr[$n] = '';
 		}
 
 		# Parsing span elements, including code spans, character escapes, 
 		# and inline HTML tags, so that pipes inside those gets ignored.
 		$head		= $this->parseSpan($head);
 		$headers	= preg_split('/ *[|] */', $head);
 		$col_count	= count($headers);
 
 		# Write column headers.
 		$text = "<table>\n";
 		$text .= "<thead>\n";
 		$text .= "<tr>\n";
 		foreach ($headers as $n => $header)
 			$text .= " <th$attr[$n]>".$this->runSpanGamut(trim($header))."</th>\n";
 		$text .= "</tr>\n";
 		$text .= "</thead>\n";
 
 		# Split content by row.
 		$rows = explode("\n", trim($content, "\n"));
 
 		$text .= "<tbody>\n";
 		foreach ($rows as $row) {
 			# Parsing span elements, including code spans, character escapes, 
 			# and inline HTML tags, so that pipes inside those gets ignored.
 			$row = $this->parseSpan($row);
 
 			# Split row by cell.
 			$row_cells = preg_split('/ *[|] */', $row, $col_count);
 			$row_cells = array_pad($row_cells, $col_count, '');
 
 			$text .= "<tr>\n";
 			foreach ($row_cells as $n => $cell)
 				$text .= " <td$attr[$n]>".$this->runSpanGamut(trim($cell))."</td>\n";
 			$text .= "</tr>\n";
 		}
 		$text .= "</tbody>\n";
 		$text .= "</table>";
 
 		return $this->hashBlock($text) . "\n";
 	}
 
 
 	function doDefLists($text) {
 	#
 	# Form HTML definition lists.
 	#
 		$less_than_tab = $this->tab_width - 1;
 
 		# Re-usable pattern to match any entire dl list:
 		$whole_list_re = '(?>
 			(								# $1 = whole list
 			 (								# $2
 				[ ]{0,'.$less_than_tab.'}
 				((?>.*\S.*\n)+)				# $3 = defined term
 				\n?
 				[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
 			 )
 			 (?s:.+?)
 			 (								# $4
 				 \z
 				|
 				 \n{2,}
 				 (?=\S)
 				 (?!						# Negative lookahead for another term
 					[ ]{0,'.$less_than_tab.'}
 					(?: \S.*\n )+?			# defined term
 					\n?
 					[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
 				 )
 				 (?!						# Negative lookahead for another definition
 					[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
 				 )
 			 )
 			)
 		)'; // mx
 
 		$text = preg_replace_callback('{
 				(?>\A\n?|(?<=\n\n))
 				'.$whole_list_re.'
 			}mx',
 			array(&$this, '_doDefLists_callback'), $text);
 
 		return $text;
 	}
 	function _doDefLists_callback($matches) {
 		# Re-usable patterns to match list item bullets and number markers:
 		$list = $matches[1];
 
 		# Turn double returns into triple returns, so that we can make a
 		# paragraph for the last item in a list, if necessary:
 		$result = trim($this->processDefListItems($list));
 		$result = "<dl>\n" . $result . "\n</dl>";
 		return $this->hashBlock($result) . "\n\n";
 	}
 
 
 	function processDefListItems($list_str) {
 	#
 	#	Process the contents of a single definition list, splitting it
 	#	into individual term and definition list items.
 	#
 		$less_than_tab = $this->tab_width - 1;
 
 		# trim trailing blank lines:
 		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
 
 		# Process definition terms.
 		$list_str = preg_replace_callback('{
 			(?>\A\n?|\n\n+)					# leading line
 			(								# definition terms = $1
 				[ ]{0,'.$less_than_tab.'}	# leading whitespace
 				(?!\:[ ]|[ ])				# negative lookahead for a definition
 											# mark (colon) or more whitespace.
 				(?> \S.* \n)+?				# actual term (not whitespace).	
 			)			
 			(?=\n?[ ]{0,3}:[ ])				# lookahead for following line feed 
 											# with a definition mark.
 			}xm',
 			array(&$this, '_processDefListItems_callback_dt'), $list_str);
 
 		# Process actual definitions.
 		$list_str = preg_replace_callback('{
 			\n(\n+)?						# leading line = $1
 			(								# marker space = $2
 				[ ]{0,'.$less_than_tab.'}	# whitespace before colon
 				\:[ ]+						# definition mark (colon)
 			)
 			((?s:.+?))						# definition text = $3
 			(?= \n+ 						# stop at next definition mark,
 				(?:							# next term or end of text
 					[ ]{0,'.$less_than_tab.'} \:[ ]	|
 					<dt> | \z
 				)						
 			)					
 			}xm',
 			array(&$this, '_processDefListItems_callback_dd'), $list_str);
 
 		return $list_str;
 	}
 	function _processDefListItems_callback_dt($matches) {
 		$terms = explode("\n", trim($matches[1]));
 		$text = '';
 		foreach ($terms as $term) {
 			$term = $this->runSpanGamut(trim($term));
 			$text .= "\n<dt>" . $term . "</dt>";
 		}
 		return $text . "\n";
 	}
 	function _processDefListItems_callback_dd($matches) {
 		$leading_line	= $matches[1];
 		$marker_space	= $matches[2];
 		$def			= $matches[3];
 
 		if ($leading_line || preg_match('/\n{2,}/', $def)) {
 			# Replace marker with the appropriate whitespace indentation
 			$def = str_repeat(' ', strlen($marker_space)) . $def;
 			$def = $this->runBlockGamut($this->outdent($def . "\n\n"));
 			$def = "\n". $def ."\n";
 		}
 		else {
 			$def = rtrim($def);
 			$def = $this->runSpanGamut($this->outdent($def));
 		}
 
 		return "\n<dd>" . $def . "</dd>\n";
 	}
 
 
 	function doFencedCodeBlocks($text) {
 	#
 	# Adding the fenced code block syntax to regular Markdown:
 	#
 	# ~~~
 	# Code block
 	# ~~~
 	#
 		$less_than_tab = $this->tab_width;
 
 		$text = preg_replace_callback('{
 				(?:\n|\A)
 				# 1: Opening marker
 				(
 					~{3,} # Marker: three tilde or more.
 				)
 				[ ]*
 				(?:
 					\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
 				|
 					'.$this->id_class_attr_catch_re.' # 3: Extra attributes
 				)?
 				[ ]* \n # Whitespace and newline following marker.
 				
 				# 4: Content
 				(
 					(?>
 						(?!\1 [ ]* \n)	# Not a closing marker.
 						.*\n+
 					)+
 				)
 				
 				# Closing marker.
 				\1 [ ]* \n
 			}xm',
 			array(&$this, '_doFencedCodeBlocks_callback'), $text);
 
 		return $text;
 	}
 	function _doFencedCodeBlocks_callback($matches) {
 		$classname =& $matches[2];
 		$attrs =& $matches[3];
 		$codeblock = $matches[4];
 		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
 		$codeblock = preg_replace_callback('/^\n+/',
 			array(&$this, '_doFencedCodeBlocks_newlines'), $codeblock);
 
 		if ($classname != "") {
 			if ($classname{0} == '.')
 				$classname = substr($classname, 1);
 			$attr_str = ' class="'.$this->code_class_prefix.$classname.'"';
 		} else {
 			$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs);
 		}
 		$pre_attr_str = $this->code_attr_on_pre ? $attr_str : '';
 		$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
 		$codeblock = "<pre$pre_attr_str><code$code_attr_str>$codeblock</code></pre>";
 
 		return "\n\n".$this->hashBlock($codeblock)."\n\n";
 	}
 	function _doFencedCodeBlocks_newlines($matches) {
 		return str_repeat("<br$this->empty_element_suffix", 
 			strlen($matches[0]));
 	}
 
 
 	#
 	# Redefining emphasis markers so that emphasis by underscore does not
 	# work in the middle of a word.
 	#
 	var $em_relist = array(
 		'' => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?=\S|$)(?![\.,:;]\s)',
 		'*' => '(?<=\S|^)(?<!\*)\*(?!\*)',
 		'_' => '(?<=\S|^)(?<!_)_(?![a-zA-Z0-9_])',
 		);
 	var $strong_relist = array(
 		'' => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?=\S|$)(?![\.,:;]\s)',
 		'**' => '(?<=\S|^)(?<!\*)\*\*(?!\*)',
 		'__' => '(?<=\S|^)(?<!_)__(?![a-zA-Z0-9_])',
 		);
 	var $em_strong_relist = array(
 		'' => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?=\S|$)(?![\.,:;]\s)',
 		'***' => '(?<=\S|^)(?<!\*)\*\*\*(?!\*)',
 		'___' => '(?<=\S|^)(?<!_)___(?![a-zA-Z0-9_])',
 		);
 
 
 	function formParagraphs($text) {
 	#
 	#	Params:
 	#		$text - string to process with html tags
 	#
 		# Strip leading and trailing lines:
 		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
 
 		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
 
 		#
 		# Wrap tags and unhashify HTML blocks
 		#
 		foreach ($grafs as $key => $value) {
 			$value = trim($this->runSpanGamut($value));
 
 			# Check if this should be enclosed in a paragraph.
 			# Clean tag hashes & block tag hashes are left alone.
 			$is_p = !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
 
 			if ($is_p) {
 				$value = "$value";
 			}
 			$grafs[$key] = $value;
 		}
 
 		# Join grafs in one text, then unhash HTML tags. 
 		$text = implode("\n\n", $grafs);
 
 		# Finish by removing any tag hashes still present in $text.
 		$text = $this->unhash($text);
 
 		return $text;
 	}
 
 
 	### Footnotes
 
 	function stripFootnotes($text) {
 	#
 	# Strips link definitions from text, stores the URLs and titles in
 	# hash references.
 	#
 		$less_than_tab = $this->tab_width - 1;
 
 		# Link defs are in the form: [^id]: url "optional title"
 		$text = preg_replace_callback('{
 			^[ ]{0,'.$less_than_tab.'}\[\^(.+?)\][ ]?:	# note_id = $1
 			 [ ]*
 			 \n?					# maybe *one* newline
 			(						# text = $2 (no blank lines allowed)
 				(?:					
 					.+				# actual text
 				|
 					\n				# newlines but 
 					(?!\[\^.+?\]:\s)# negative lookahead for footnote marker.
 					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed 
 									# by non-indented content
 				)*
 			)		
 			}xm',
 			array(&$this, '_stripFootnotes_callback'),
 			$text);
 		return $text;
 	}
 	function _stripFootnotes_callback($matches) {
 		$note_id = $this->fn_id_prefix . $matches[1];
 		$this->footnotes[$note_id] = $this->outdent($matches[2]);
 		return ''; # String that will replace the block
 	}
 
 
 	function doFootnotes($text) {
 	#
 	# Replace footnote references in $text [^id] with a special text-token 
 	# which will be replaced by the actual footnote marker in appendFootnotes.
 	#
 		if (!$this->in_anchor) {
 			$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
 		}
 		return $text;
 	}
 
 
 	function appendFootnotes($text) {
 	#
 	# Append footnote list to text.
 	#
 		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
 			array(&$this, '_appendFootnotes_callback'), $text);
 
 		if (!empty($this->footnotes_ordered)) {
 			$text .= "\n\n";
 			$text .= "<div class=\"footnotes\">\n";
 			$text .= "<hr". $this->empty_element_suffix ."\n";
 			$text .= "<ol>\n\n";
 
 			$attr = " rev=\"footnote\"";
 			if ($this->fn_backlink_class != "") {
 				$class = $this->fn_backlink_class;
 				$class = $this->encodeAttribute($class);
 				$attr .= " class=\"$class\"";
 			}
 			if ($this->fn_backlink_title != "") {
 				$title = $this->fn_backlink_title;
 				$title = $this->encodeAttribute($title);
 				$attr .= " title=\"$title\"";
 			}
 			$num = 0;
 
 			while (!empty($this->footnotes_ordered)) {
 				$footnote = reset($this->footnotes_ordered);
 				$note_id = key($this->footnotes_ordered);
 				unset($this->footnotes_ordered[$note_id]);
 				$ref_count = $this->footnotes_ref_count[$note_id];
 				unset($this->footnotes_ref_count[$note_id]);
 				unset($this->footnotes[$note_id]);
 
 				$footnote .= "\n"; # Need to append newline before parsing.
 				$footnote = $this->runBlockGamut("$footnote\n");				
 				$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
 					array(&$this, '_appendFootnotes_callback'), $footnote);
 
 				$attr = str_replace("%%", ++$num, $attr);
 				$note_id = $this->encodeAttribute($note_id);
 
 				# Prepare backlink, multiple backlinks if multiple references
 				$backlink = "<a href=\"#fnref:$note_id\"$attr>&#8617;</a>";
 				for ($ref_num = 2; $ref_num <= $ref_count; ++$ref_num) {
 					$backlink .= " <a href=\"#fnref$ref_num:$note_id\"$attr>&#8617;</a>";
 				}
 				# Add backlink to last paragraph; create new paragraph if needed.
 				if (preg_match('{$}', $footnote)) {
 					$footnote = substr($footnote, 0, -4) . "&#160;$backlink";
 				} else {
 					$footnote .= "\n\n$backlink";
 				}
 
 				$text .= "<li id=\"fn:$note_id\">\n";
 				$text .= $footnote . "\n";
 				$text .= "</li>\n\n";
 			}
 
 			$text .= "</ol>\n";
 			$text .= "</div>";
 		}
 		return $text;
 	}
 	function _appendFootnotes_callback($matches) {
 		$node_id = $this->fn_id_prefix . $matches[1];
 
 		# Create footnote marker only if it has a corresponding footnote *and*
 		# the footnote hasn't been used by another marker.
 		if (isset($this->footnotes[$node_id])) {
 			$num =& $this->footnotes_numbers[$node_id];
 			if (!isset($num)) {
 				# Transfer footnote content to the ordered list and give it its
 				# number
 				$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
 				$this->footnotes_ref_count[$node_id] = 1;
 				$num = $this->footnote_counter++;
 				$ref_count_mark = '';
 			} else {
 				$ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
 			}
 
 			if ($this->fn_link_class != "") {
 				$class = $this->fn_link_class;
 				$class = $this->encodeAttribute($class);
 				$attr .= " class=\"$class\"";
 			}
 			if ($this->fn_link_title != "") {
 				$title = $this->fn_link_title;
 				$title = $this->encodeAttribute($title);
 				$attr .= " title=\"$title\"";
 			}
 
 			$attr = str_replace("%%", $num, $attr);
 			$node_id = $this->encodeAttribute($node_id);
 
 			return
 				"".
 				"<a href=\"#fn:$node_id\"$attr>$num</a>".
 				"";
 		}
 
 		return "[^".$matches[1]."]";
 	}
 
 
 	### Abbreviations ###
 
 	function stripAbbreviations($text) {
 	#
 	# Strips abbreviations from text, stores titles in hash references.
 	#
 		$less_than_tab = $this->tab_width - 1;
 
 		# Link defs are in the form: [id]*: url "optional title"
 		$text = preg_replace_callback('{
 			^[ ]{0,'.$less_than_tab.'}\*\[(.+?)\][ ]?:	# abbr_id = $1
 			(.*)					# text = $2 (no blank lines allowed)	
 			}xm',
 			array(&$this, '_stripAbbreviations_callback'),
 			$text);
 		return $text;
 	}
 	function _stripAbbreviations_callback($matches) {
 		$abbr_word = $matches[1];
 		$abbr_desc = $matches[2];
 		if ($this->abbr_word_re)
 			$this->abbr_word_re .= '|';
 		$this->abbr_word_re .= preg_quote($abbr_word);
 		$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
 		return ''; # String that will replace the block
 	}
 
 
 	function doAbbreviations($text) {
 	#
 	# Find defined abbreviations in text and wrap them in <abbr> elements.
 	#
 		if ($this->abbr_word_re) {
 			// cannot use the /x modifier because abbr_word_re may 
 			// contain significant spaces:
 			$text = preg_replace_callback('{'.
 				'(?<![\w\x1A])'.
 				'(?:'.$this->abbr_word_re.')'.
 				'(?![\w\x1A])'.
 				'}', 
 				array(&$this, '_doAbbreviations_callback'), $text);
 		}
 		return $text;
 	}
 	function _doAbbreviations_callback($matches) {
 		$abbr = $matches[0];
 		if (isset($this->abbr_desciptions[$abbr])) {
 			$desc = $this->abbr_desciptions[$abbr];
 			if (empty($desc)) {
 				return $this->hashPart("<abbr>$abbr</abbr>");
 			} else {
 				$desc = $this->encodeAttribute($desc);
 				return $this->hashPart("<abbr title=\"$desc\">$abbr</abbr>");
 			}
 		} else {
 			return $matches[0];
 		}
 	}
 
 }
 
 
 class CustomMarkdown extends Markdown
 {
 	function _doImages_reference_callback($matches) {
 		$whole_match = $matches[1];
 		$alt_text = $matches[2];
 		$link_id = strtolower($matches[3]);
 
 		if ($link_id == "") {
 			$link_id = strtolower($alt_text); # for shortcut links like ![this][].
 		}
 
 		$alt_text = $this->encodeAttribute($alt_text);
 		if (isset($this->urls[$link_id])) {
 			$url = $this->encodeAttribute($this->urls[$link_id]);
 			$result = "<a href\"$url\">$alt_text</a>";
 			//$result = $this->hashPart($result);
 		}
 		else {
 			# If there's no such link ID, leave intact:
 			$result = $whole_match;
 		}
 		//return 12;
 		return $result;
 	}
 	function _doImages_inline_callback($matches) {
 		$whole_match	= $matches[1];
 		$alt_text		= $matches[2];
 		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
 		$title			=& $matches[7];
 
 		$alt_text = $this->encodeAttribute($alt_text);
 		$url = $this->encodeAttribute($url);
 		$result = "<a href=\"$url\">$alt_text</a>";
 return 10;
 		return $this->hashPart($result);
 	}
 }
 
 
 echo CustomMarkdown::defaultTransform('![enter image description here][1]
 
 
 [1]: http://i.stack.imgur.com/9svmT.png');

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