` 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 $text;
	}
	public function _doCodeBlocks_callback($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 = "
$codeblock\n
";
		return "\n\n".$this->hashBlock($codeblock)."\n\n";
	}


	public function makeCodeSpan($code) {
	#
	# Create a code span markup for $code. Called from handleSpanToken.
	#
		$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
		return $this->hashPart("$code");
	}


	public $em_relist = array(
		''  => '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(?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;
			}
		}
	}
	
	public 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";
					$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";
						$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];
	}


	public 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;
	}
	
	public 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 
 content, 
		# so we need to fix that:
		$bq = preg_replace_callback('{(\s*
.+?
)}sx', 
			array(&$this, '_doBlockQuotes_callback2'), $bq);

		return "\n". $this->hashBlock("
\n$bq\n
")."\n\n";
	}
	
	public function _doBlockQuotes_callback2($matches) {
		$pre = $matches[1];
		$pre = preg_replace('/^  /m', '', $pre);
		return $pre;
	}


	public 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 = 
 tag
//					  
]*
//					  \b
//					  markdown\s*=\s*  ([\'"])	#	$2 = attr quote char
//					  1
//					  \2
//					  [^>]*
//					  >
//					)
//					(							# $3 = contents
//					.*
//					)
//					(
)					# $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);
	}


	public 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('"', '"', $text);
		return $text;
	}


	public 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('&', '&', $text);
		} else {
			# Ampersand-encoding based entirely on Nat Irons's Amputator
			# MT plugin: 
			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/',
								'&', $text);;
		}
		# Encode remaining <'s
		$text = str_replace('<', '<', $text);

		return $text;
	}


	public function doAutoLinks($text) {
		$text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}i',
			array(&$this, '_doAutoLinks_url_callback'), $text);

		# Email addresses: 
		$text = preg_replace_callback('{
			<
			(?:mailto:)?
			(
				(?:
					[-!#$%&\'*+/=?^_`.{|}~\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 $text;
	}
	public function _doAutoLinks_url_callback($matches) {
		$url = $this->encodeAttribute($matches[1]);
		$link = "$url";
		return $this->hashPart($link);
	}
	public function _doAutoLinks_email_callback($matches) {
		$address = $matches[1];
		$link = $this->encodeEmailAddress($address);
		return $this->hashPart($link);
	}


	public 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.:
	#
	#	  
foo@exampl
	#        e.com
	#
	#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
	#   With some optimizations by Milian Wolff.
	#
		$addr = "mailto:" . $addr;
		$chars = preg_split('/(? $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:`
		$addr = "$text";

		return $addr;
	}


	public 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.'
				|
					(?no_markup ? '' : '
				|
							# comment
				|
					<\?.*?\?> | <%.*?%>		# processing instruction
				|
					<[/!$]?[-a-zA-Z0-9:_]+	# regular tags
					(?>
						\s
						(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
					)?
					>
			').'
				)
				}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;
	}


	public 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);
		}
	}


	public 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.
	public $utf8_strlen = 'mb_strlen';

	public 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 $text;
	}
	public function _detab_callback($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 $line;
	}
	public function _initDetab() {
	#
	# Check for the availability of the function in the `utf8_strlen` property
	# (initially `mb_strlen`). If the function is not available, create a
	# function that will loosely count the number of UTF-8 characters with a
	# regular expression.
	#
		if (function_exists($this->utf8_strlen)) return;
		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
			$text, $m);');
	}


	public function unhash($text) {
	#
	# Swap back in all the tags hashed by _HashHTMLBlocks.
	#
		return preg_replace_callback('/(.)\x1A[0-9]+\1/',
			array(&$this, '_unhash_callback'), $text);
	}
	public function _unhash_callback($matches) {
		return $this->html_hashes[$matches[0]];
	}

}


#
# Markdown Extra Parser Class
#

class MarkdownExtra_Parser extends Markdown_Parser {

	# Prefix for footnote ids.
	public $fn_id_prefix = "";

	# Optional title attribute for footnote links and backlinks.
	public $fn_link_title = '';
	public $fn_backlink_title = '';

	# Optional class attribute for footnote links and backlinks.
	public $fn_link_class = '';
	public $fn_backlink_class = '';

	# Predefined abbreviations.
	public $predef_abbr = array();


	public 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.
	public $footnotes = array();
	public $footnotes_ordered = array();
	public $abbr_desciptions = array();
	public $abbr_word_re = '';

	# Give the current footnote number.
	public $footnote_counter = 1;


	public function setup() {
	#
	# Setting up Extra-specific variables.
	#
		parent::setup();

		$this->footnotes = array();
		$this->footnotes_ordered = 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);
		}
	}

	public function teardown() {
	#
	# Clearing Extra-specific variables.
	#
		$this->footnotes = array();
		$this->footnotes_ordered = array();
		$this->abbr_desciptions = array();
		$this->abbr_word_re = '';

		parent::teardown();
	}


	### HTML Block Parser ###

	# Tags that are always treated as block tags:
	public $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend';

	# Tags treated as block tags only if the opening tag is alone on it's line:
	public $context_block_tags_re = 'script|noscript|math|ins|del';

	# Tags where markdown="1" default to span mode:
	public $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:
	public $clean_tags_re = 'script|math';

	# Tags that do not need to be closed.
	public $auto_close_tags_re = 'hr|img';


	public function hashHTMLBlocks($text) {
	#
	# Hashify HTML Blocks and "clean tags".
	#
	# We only want to do this for block-level HTML tags, such as headers,
	# lists, and tables. That's because we still want to wrap 
s around
	# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
	# phrase emphasis, and spans. The list of tags we're looking for is
	# hard-coded.
	#
	# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
	# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
	# attribute is found whitin a tag, _HashHTMLBlocks_InHTML calls back
	#  _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
	# These two functions are calling each other. It's recursive!
	#
		#
		# Call the HTML-in-Markdown hasher.
		#
		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);

		return $text;
	}
	public function _hashHTMLBlocks_inMarkdown($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:
	#
	#     

	#         

	#         Hello World.  <-- Is this a Markdown code block or text?
	#         
  <-- Is this a Markdown code block or a real tag?
	#     

	#
	#     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 =
			'{
				(					# $2: Capture hole tag.
									# Tag name.
							'.$this->block_tags_re.'			|
							'.$this->context_block_tags_re.'	|
							'.$this->clean_tags_re.'        	|
							(?!\s)'.$enclosing_tag_re.'
						)
						(?:
							(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
							(?>
								".*?"		|	# Double quotes (can contain `>`)
								\'.*?\'   	|	# Single quotes (can contain `>`)
								.+?				# Anything but quotes and `>`.
							)*?
						)?
					>					# End of tag.
				|
						# HTML Comment
				|
					<\?.*?\?> | <%.*?%>	# Processing instruction
				|
						# CData Block
				|
					# Code span marker
					`+
				'. ( !$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).'}~~~+[ ]*\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))*?(?.*\n)+?[ ]{0,'.($indent).'}'.$tag_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('{^= 0);

		return array($parsed, $text);
	}
	public function _hashHTMLBlocks_inHTML($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 hole tag.
					
								".*?"		|	# Double quotes (can contain `>`)
								\'.*?\'   	|	# Single quotes (can contain `>`)
								.+?				# Anything but quotes and `>`.
							)*?
						)?
					>					# End of tag.
				|
						# HTML Comment
				|
					<\?.*?\?> | <%.*?%>	# Processing instruction
				|
						# 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 
)
			#			 Comments and Processing Instructions.
			#
			if (preg_match('{^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('{^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 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);
	}


	public function hashClean($text) {
	#
	# Called whenever a tag must be hashed when a function insert a "clean" tag
	# in $text, it pass through this function and is automaticaly escaped,
	# blocking invalid nested overlap.
	#
		return $this->hashPart($text, 'C');
	}


	public function doHeaders($text) {
	#
	# Redefined to add id attribute support.
	#
		# Setext-style headers:
		#	  Header 1  {#header1}
		#	  ========
		#
		#	  Header 2  {#header2}
		#	  --------
		#
		$text = preg_replace_callback(
			'{
				(^.+?)								# $1: Header text
				(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})?	# $2: Id attribute
				[ ]*\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}
		#	...
		#	###### Header 6   {#header2}
		#
		$text = preg_replace_callback('{
				^(\#{1,6})	# $1 = string of #\'s
				[ ]*
				(.+?)		# $2 = Header text
				[ ]*
				\#*			# optional closing #\'s (not counted)
				(?:[ ]+\{\#([-_:a-zA-Z0-9]+)\})? # id attribute
				[ ]*
				\n+
			}xm',
			array(&$this, '_doHeaders_callback_atx'), $text);

		return $text;
	}
	public function _doHeaders_attr($attr) {
		if (empty($attr))  return "";
		return " id=\"$attr\"";
	}
	public function _doHeaders_callback_setext($matches) {
		if ($matches[3] == '-' && preg_match('{^- }', $matches[1]))
			return $matches[0];
		$level = $matches[3]{0} == '=' ? 1 : 2;
		$attr  = $this->_doHeaders_attr($id =& $matches[2]);
		$block = "".$this->runSpanGamut($matches[1])."";
		return "\n" . $this->hashBlock($block) . "\n\n";
	}
	public function _doHeaders_callback_atx($matches) {
		$level = strlen($matches[1]);
		$attr  = $this->_doHeaders_attr($id =& $matches[3]);
		$block = "".$this->runSpanGamut($matches[2])."";
		return "\n" . $this->hashBlock($block) . "\n\n";
	}


	public 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 $text;
	}
	public function _doTable_leadingPipe_callback($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, $content));
	}
	public function _doTable_callback($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 = "\n";
		$text .= "\n";
		$text .= "\n";
		foreach ($headers as $n => $header)
			$text .= "  ".$this->runSpanGamut(trim($header))."\n";
		$text .= "\n";
		$text .= "\n";

		# Split content by row.
		$rows = explode("\n", trim($content, "\n"));

		$text .= "\n";
		foreach ($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, '');

			$text .= "\n";
			foreach ($row_cells as $n => $cell)
				$text .= "  ".$this->runSpanGamut(trim($cell))."\n";
			$text .= "\n";
		}
		$text .= "\n";
		$text .= "";

		return $this->hashBlock($text) . "\n";
	}


	public 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 $text;
	}
	public function _doDefLists_callback($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 = "
\n" . $result . "\n
";
		return $this->hashBlock($result) . "\n\n";
	}


	public 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.'} [:][ ]	|
					
 | \z
				)
			)
			}xm',
			array(&$this, '_processDefListItems_callback_dd'), $list_str);

		return $list_str;
	}
	public function _processDefListItems_callback_dt($matches) {
		$terms = explode("\n", trim($matches[1]));
		$text = '';
		foreach ($terms as $term) {
			$term = $this->runSpanGamut(trim($term));
			$text .= "\n
" . $term . "
";
		}
		return $text . "\n";
	}
	public function _processDefListItems_callback_dd($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
" . $def . "
\n";
	}


	public 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.
				)
				[ ]* \n # Whitespace and newline following marker.

				# 2: Content
				(
					(?>
						(?!\1 [ ]* \n)	# Not a closing marker.
						.*\n+
					)+
				)

				# Closing marker.
				\1 [ ]* \n
			}xm',
			array(&$this, '_doFencedCodeBlocks_callback'), $text);

		return $text;
	}
	public function _doFencedCodeBlocks_callback($matches) {
		$codeblock = $matches[2];
		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
		$codeblock = preg_replace_callback('/^\n+/',
			array(&$this, '_doFencedCodeBlocks_newlines'), $codeblock);
		$codeblock = "
$codeblock
";
		return "\n\n".$this->hashBlock($codeblock)."\n\n";
	}
	public function _doFencedCodeBlocks_newlines($matches) {
		return str_repeat("empty_element_suffix",
			strlen($matches[0]));
	}


	#
	# Redefining emphasis markers so that emphasis by underscore does not
	# work in the middle of a word.
	#
	public $em_relist = array(
		''  => '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? 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

	public 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 $text;
	}
	public function _stripFootnotes_callback($matches) {
		$note_id = $this->fn_id_prefix . $matches[1];
		$this->footnotes[$note_id] = $this->outdent($matches[2]);
		return ''; # String that will replace the block
	}


	public 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;
	}

	
	public 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 .= "
\n";
			$text .= "empty_element_suffix ."\n";
			$text .= "
\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]);

				$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);

				# Add backlink to last paragraph; create new paragraph if needed.
				$backlink = "↩";
				if (preg_match('{
$}', $footnote)) {
					$footnote = substr($footnote, 0, -4) . " $backlink
";
				} else {
					$footnote .= "\n\n
$backlink
";
				}

				$text .= "
\n";
				$text .= $footnote . "\n";
				$text .= "
\n\n";
			}

			$text .= "
\n";
			$text .= "
";
		}
		return $text;
	}
	public function _appendFootnotes_callback($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])) {
			# Transfert footnote content to the ordered list.
			$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
			unset($this->footnotes[$node_id]);

			$num = $this->footnote_counter++;
			$attr = " rel=\"footnote\"";
			if ($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
				"".
				"$num".
				"";
		}

		return "[^".$matches[1]."]";
	}


	### Abbreviations ###

	public 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 $text;
	}
	public function _stripAbbreviations_callback($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
	}


	public function doAbbreviations($text) {
	#
	# Find defined abbreviations in text and wrap them in  elements.
	#
		if ($this->abbr_word_re) {
			// cannot use the /x modifier because abbr_word_re may
			// contain significant spaces:
			$text = preg_replace_callback('{'.
				'(?abbr_word_re.')'.
				'(?![\w\x1A])'.
				'}',
				array(&$this, '_doAbbreviations_callback'), $text);
		}
		return $text;
	}
	public function _doAbbreviations_callback($matches) {
		$abbr = $matches[0];
		if (isset($this->abbr_desciptions[$abbr])) {
			$desc = $this->abbr_desciptions[$abbr];
			if (empty($desc)) {
				return $this->hashPart("$abbr");
			} else {
				$desc = $this->encodeAttribute($desc);
				return $this->hashPart("$abbr");
			}
		} else {
			return $matches[0];
		}
	}

}