balmet.com

parsedown.php (41511B)

---

 <?php
 
 #
 #
 # Parsedown
 # http://parsedown.org
 #
 # (c) Emanuil Rusev
 # http://erusev.com
 #
 # For the full license information, view the LICENSE file that was distributed
 # with this source code.
 #
 #
 
 if (! class_exists( 'Redux_Parsedown' ) ) {
 	class Redux_Parsedown
 	{
 		# ~
 
 		const version = '1.8.0-beta-7';
 
 		# ~
 
 		function text($text)
 		{
 			$Elements = $this->textElements($text);
 
 			# convert to markup
 			$markup = $this->elements($Elements);
 
 			# trim line breaks
 			$markup = trim($markup, "\n");
 
 			return $markup;
 		}
 
 		protected function textElements($text)
 		{
 			# make sure no definitions are set
 			$this->DefinitionData = array();
 
 			# standardize line breaks
 			$text = str_replace(array("\r\n", "\r"), "\n", $text);
 
 			# remove surrounding line breaks
 			$text = trim($text, "\n");
 
 			# split text into lines
 			$lines = explode("\n", $text);
 
 			# iterate through lines to identify blocks
 			return $this->linesElements($lines);
 		}
 
 		#
 		# Setters
 		#
 
 		function setBreaksEnabled($breaksEnabled)
 		{
 			$this->breaksEnabled = $breaksEnabled;
 
 			return $this;
 		}
 
 		protected $breaksEnabled;
 
 		function setMarkupEscaped($markupEscaped)
 		{
 			$this->markupEscaped = $markupEscaped;
 
 			return $this;
 		}
 
 		protected $markupEscaped;
 
 		function setUrlsLinked($urlsLinked)
 		{
 			$this->urlsLinked = $urlsLinked;
 
 			return $this;
 		}
 
 		protected $urlsLinked = true;
 
 		function setSafeMode($safeMode)
 		{
 			$this->safeMode = (bool) $safeMode;
 
 			return $this;
 		}
 
 		protected $safeMode;
 
 		function setStrictMode($strictMode)
 		{
 			$this->strictMode = (bool) $strictMode;
 
 			return $this;
 		}
 
 		protected $strictMode;
 
 		protected $safeLinksWhitelist = array(
 			'http://',
 			'https://',
 			'ftp://',
 			'ftps://',
 			'mailto:',
 			'tel:',
 			'data:image/png;base64,',
 			'data:image/gif;base64,',
 			'data:image/jpeg;base64,',
 			'irc:',
 			'ircs:',
 			'git:',
 			'ssh:',
 			'news:',
 			'steam:',
 		);
 
 		#
 		# Lines
 		#
 
 		protected $BlockTypes = array(
 			'#' => array('Header'),
 			'*' => array('Rule', 'List'),
 			'+' => array('List'),
 			'-' => array('SetextHeader', 'Table', 'Rule', 'List'),
 			'0' => array('List'),
 			'1' => array('List'),
 			'2' => array('List'),
 			'3' => array('List'),
 			'4' => array('List'),
 			'5' => array('List'),
 			'6' => array('List'),
 			'7' => array('List'),
 			'8' => array('List'),
 			'9' => array('List'),
 			':' => array('Table'),
 			'<' => array('Comment', 'Markup'),
 			'=' => array('SetextHeader'),
 			'>' => array('Quote'),
 			'[' => array('Reference'),
 			'_' => array('Rule'),
 			'`' => array('FencedCode'),
 			'|' => array('Table'),
 			'~' => array('FencedCode'),
 		);
 
 		# ~
 
 		protected $unmarkedBlockTypes = array(
 			'Code',
 		);
 
 		#
 		# Blocks
 		#
 
 		protected function lines(array $lines)
 		{
 			return $this->elements($this->linesElements($lines));
 		}
 
 		protected function linesElements(array $lines)
 		{
 			$Elements = array();
 			$CurrentBlock = null;
 
 			foreach ($lines as $line)
 			{
 				if (chop($line) === '')
 				{
 					if (isset($CurrentBlock))
 					{
 						$CurrentBlock['interrupted'] = (isset($CurrentBlock['interrupted'])
 							? $CurrentBlock['interrupted'] + 1 : 1
 						);
 					}
 
 					continue;
 				}
 
 				while (($beforeTab = strstr($line, "\t", true)) !== false)
 				{
 					$shortage = 4 - mb_strlen($beforeTab, 'utf-8') % 4;
 
 					$line = $beforeTab
 					        . str_repeat(' ', $shortage)
 					        . substr($line, strlen($beforeTab) + 1)
 					;
 				}
 
 				$indent = strspn($line, ' ');
 
 				$text = $indent > 0 ? substr($line, $indent) : $line;
 
 				# ~
 
 				$Line = array('body' => $line, 'indent' => $indent, 'text' => $text);
 
 				# ~
 
 				if (isset($CurrentBlock['continuable']))
 				{
 					$methodName = 'block' . $CurrentBlock['type'] . 'Continue';
 					$Block = $this->$methodName($Line, $CurrentBlock);
 
 					if (isset($Block))
 					{
 						$CurrentBlock = $Block;
 
 						continue;
 					}
 					else
 					{
 						if ($this->isBlockCompletable($CurrentBlock['type']))
 						{
 							$methodName = 'block' . $CurrentBlock['type'] . 'Complete';
 							$CurrentBlock = $this->$methodName($CurrentBlock);
 						}
 					}
 				}
 
 				# ~
 
 				$marker = $text[0];
 
 				# ~
 
 				$blockTypes = $this->unmarkedBlockTypes;
 
 				if (isset($this->BlockTypes[$marker]))
 				{
 					foreach ($this->BlockTypes[$marker] as $blockType)
 					{
 						$blockTypes []= $blockType;
 					}
 				}
 
 				#
 				# ~
 
 				foreach ($blockTypes as $blockType)
 				{
 					$Block = $this->{"block$blockType"}($Line, $CurrentBlock);
 
 					if (isset($Block))
 					{
 						$Block['type'] = $blockType;
 
 						if ( ! isset($Block['identified']))
 						{
 							if (isset($CurrentBlock))
 							{
 								$Elements[] = $this->extractElement($CurrentBlock);
 							}
 
 							$Block['identified'] = true;
 						}
 
 						if ($this->isBlockContinuable($blockType))
 						{
 							$Block['continuable'] = true;
 						}
 
 						$CurrentBlock = $Block;
 
 						continue 2;
 					}
 				}
 
 				# ~
 
 				if (isset($CurrentBlock) and $CurrentBlock['type'] === 'Paragraph')
 				{
 					$Block = $this->paragraphContinue($Line, $CurrentBlock);
 				}
 
 				if (isset($Block))
 				{
 					$CurrentBlock = $Block;
 				}
 				else
 				{
 					if (isset($CurrentBlock))
 					{
 						$Elements[] = $this->extractElement($CurrentBlock);
 					}
 
 					$CurrentBlock = $this->paragraph($Line);
 
 					$CurrentBlock['identified'] = true;
 				}
 			}
 
 			# ~
 
 			if (isset($CurrentBlock['continuable']) and $this->isBlockCompletable($CurrentBlock['type']))
 			{
 				$methodName = 'block' . $CurrentBlock['type'] . 'Complete';
 				$CurrentBlock = $this->$methodName($CurrentBlock);
 			}
 
 			# ~
 
 			if (isset($CurrentBlock))
 			{
 				$Elements[] = $this->extractElement($CurrentBlock);
 			}
 
 			# ~
 
 			return $Elements;
 		}
 
 		protected function extractElement(array $Component)
 		{
 			if ( ! isset($Component['element']))
 			{
 				if (isset($Component['markup']))
 				{
 					$Component['element'] = array('rawHtml' => $Component['markup']);
 				}
 				elseif (isset($Component['hidden']))
 				{
 					$Component['element'] = array();
 				}
 			}
 
 			return $Component['element'];
 		}
 
 		protected function isBlockContinuable($Type)
 		{
 			return method_exists($this, 'block' . $Type . 'Continue');
 		}
 
 		protected function isBlockCompletable($Type)
 		{
 			return method_exists($this, 'block' . $Type . 'Complete');
 		}
 
 		#
 		# Code
 
 		protected function blockCode($Line, $Block = null)
 		{
 			if (isset($Block) and $Block['type'] === 'Paragraph' and ! isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			if ($Line['indent'] >= 4)
 			{
 				$text = substr($Line['body'], 4);
 
 				$Block = array(
 					'element' => array(
 						'name' => 'pre',
 						'element' => array(
 							'name' => 'code',
 							'text' => $text,
 						),
 					),
 				);
 
 				return $Block;
 			}
 		}
 
 		protected function blockCodeContinue($Line, $Block)
 		{
 			if ($Line['indent'] >= 4)
 			{
 				if (isset($Block['interrupted']))
 				{
 					$Block['element']['element']['text'] .= str_repeat("\n", $Block['interrupted']);
 
 					unset($Block['interrupted']);
 				}
 
 				$Block['element']['element']['text'] .= "\n";
 
 				$text = substr($Line['body'], 4);
 
 				$Block['element']['element']['text'] .= $text;
 
 				return $Block;
 			}
 		}
 
 		protected function blockCodeComplete($Block)
 		{
 			return $Block;
 		}
 
 		#
 		# Comment
 
 		protected function blockComment($Line)
 		{
 			if ($this->markupEscaped or $this->safeMode)
 			{
 				return;
 			}
 
 			if (strpos($Line['text'], '<!--') === 0)
 			{
 				$Block = array(
 					'element' => array(
 						'rawHtml' => $Line['body'],
 						'autobreak' => true,
 					),
 				);
 
 				if (strpos($Line['text'], '-->') !== false)
 				{
 					$Block['closed'] = true;
 				}
 
 				return $Block;
 			}
 		}
 
 		protected function blockCommentContinue($Line, array $Block)
 		{
 			if (isset($Block['closed']))
 			{
 				return;
 			}
 
 			$Block['element']['rawHtml'] .= "\n" . $Line['body'];
 
 			if (strpos($Line['text'], '-->') !== false)
 			{
 				$Block['closed'] = true;
 			}
 
 			return $Block;
 		}
 
 		#
 		# Fenced Code
 
 		protected function blockFencedCode($Line)
 		{
 			$marker = $Line['text'][0];
 
 			$openerLength = strspn($Line['text'], $marker);
 
 			if ($openerLength < 3)
 			{
 				return;
 			}
 
 			$infostring = trim(substr($Line['text'], $openerLength), "\t ");
 
 			if (strpos($infostring, '`') !== false)
 			{
 				return;
 			}
 
 			$Element = array(
 				'name' => 'code',
 				'text' => '',
 			);
 
 			if ($infostring !== '')
 			{
 				/**
 				 * https://www.w3.org/TR/2011/WD-html5-20110525/elements.html#classes
 				 * Every HTML element may have a class attribute specified.
 				 * The attribute, if specified, must have a value that is a set
 				 * of space-separated tokens representing the various classes
 				 * that the element belongs to.
 				 * [...]
 				 * The space characters, for the purposes of this specification,
 				 * are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab),
 				 * U+000A LINE FEED (LF), U+000C FORM FEED (FF), and
 				 * U+000D CARRIAGE RETURN (CR).
 				 */
 				$language = substr($infostring, 0, strcspn($infostring, " \t\n\f\r"));
 
 				$Element['attributes'] = array('class' => "language-$language");
 			}
 
 			$Block = array(
 				'char' => $marker,
 				'openerLength' => $openerLength,
 				'element' => array(
 					'name' => 'pre',
 					'element' => $Element,
 				),
 			);
 
 			return $Block;
 		}
 
 		protected function blockFencedCodeContinue($Line, $Block)
 		{
 			if (isset($Block['complete']))
 			{
 				return;
 			}
 
 			if (isset($Block['interrupted']))
 			{
 				$Block['element']['element']['text'] .= str_repeat("\n", $Block['interrupted']);
 
 				unset($Block['interrupted']);
 			}
 
 			if (($len = strspn($Line['text'], $Block['char'])) >= $Block['openerLength']
 			    and chop(substr($Line['text'], $len), ' ') === ''
 			) {
 				$Block['element']['element']['text'] = substr($Block['element']['element']['text'], 1);
 
 				$Block['complete'] = true;
 
 				return $Block;
 			}
 
 			$Block['element']['element']['text'] .= "\n" . $Line['body'];
 
 			return $Block;
 		}
 
 		protected function blockFencedCodeComplete($Block)
 		{
 			return $Block;
 		}
 
 		#
 		# Header
 
 		protected function blockHeader($Line)
 		{
 			$level = strspn($Line['text'], '#');
 
 			if ($level > 6)
 			{
 				return;
 			}
 
 			$text = trim($Line['text'], '#');
 
 			if ($this->strictMode and isset($text[0]) and $text[0] !== ' ')
 			{
 				return;
 			}
 
 			$text = trim($text, ' ');
 
 			$Block = array(
 				'element' => array(
 					'name' => 'h' . $level,
 					'handler' => array(
 						'function' => 'lineElements',
 						'argument' => $text,
 						'destination' => 'elements',
 					)
 				),
 			);
 
 			return $Block;
 		}
 
 		#
 		# List
 
 		protected function blockList($Line, array $CurrentBlock = null)
 		{
 			list($name, $pattern) = $Line['text'][0] <= '-' ? array('ul', '[*+-]') : array('ol', '[0-9]{1,9}+[.\)]');
 
 			if (preg_match('/^('.$pattern.'([ ]++|$))(.*+)/', $Line['text'], $matches))
 			{
 				$contentIndent = strlen($matches[2]);
 
 				if ($contentIndent >= 5)
 				{
 					$contentIndent -= 1;
 					$matches[1] = substr($matches[1], 0, -$contentIndent);
 					$matches[3] = str_repeat(' ', $contentIndent) . $matches[3];
 				}
 				elseif ($contentIndent === 0)
 				{
 					$matches[1] .= ' ';
 				}
 
 				$markerWithoutWhitespace = strstr($matches[1], ' ', true);
 
 				$Block = array(
 					'indent' => $Line['indent'],
 					'pattern' => $pattern,
 					'data' => array(
 						'type' => $name,
 						'marker' => $matches[1],
 						'markerType' => ($name === 'ul' ? $markerWithoutWhitespace : substr($markerWithoutWhitespace, -1)),
 					),
 					'element' => array(
 						'name' => $name,
 						'elements' => array(),
 					),
 				);
 				$Block['data']['markerTypeRegex'] = preg_quote($Block['data']['markerType'], '/');
 
 				if ($name === 'ol')
 				{
 					$listStart = ltrim(strstr($matches[1], $Block['data']['markerType'], true), '0') ?: '0';
 
 					if ($listStart !== '1')
 					{
 						if (
 							isset($CurrentBlock)
 							and $CurrentBlock['type'] === 'Paragraph'
 							    and ! isset($CurrentBlock['interrupted'])
 						) {
 							return;
 						}
 
 						$Block['element']['attributes'] = array('start' => $listStart);
 					}
 				}
 
 				$Block['li'] = array(
 					'name' => 'li',
 					'handler' => array(
 						'function' => 'li',
 						'argument' => !empty($matches[3]) ? array($matches[3]) : array(),
 						'destination' => 'elements'
 					)
 				);
 
 				$Block['element']['elements'] []= & $Block['li'];
 
 				return $Block;
 			}
 		}
 
 		protected function blockListContinue($Line, array $Block)
 		{
 			if (isset($Block['interrupted']) and empty($Block['li']['handler']['argument']))
 			{
 				return null;
 			}
 
 			$requiredIndent = ($Block['indent'] + strlen($Block['data']['marker']));
 
 			if ($Line['indent'] < $requiredIndent
 			    and (
 				    (
 					    $Block['data']['type'] === 'ol'
 					    and preg_match('/^[0-9]++'.$Block['data']['markerTypeRegex'].'(?:[ ]++(.*)|$)/', $Line['text'], $matches)
 				    ) or (
 					    $Block['data']['type'] === 'ul'
 					    and preg_match('/^'.$Block['data']['markerTypeRegex'].'(?:[ ]++(.*)|$)/', $Line['text'], $matches)
 				    )
 			    )
 			) {
 				if (isset($Block['interrupted']))
 				{
 					$Block['li']['handler']['argument'] []= '';
 
 					$Block['loose'] = true;
 
 					unset($Block['interrupted']);
 				}
 
 				unset($Block['li']);
 
 				$text = isset($matches[1]) ? $matches[1] : '';
 
 				$Block['indent'] = $Line['indent'];
 
 				$Block['li'] = array(
 					'name' => 'li',
 					'handler' => array(
 						'function' => 'li',
 						'argument' => array($text),
 						'destination' => 'elements'
 					)
 				);
 
 				$Block['element']['elements'] []= & $Block['li'];
 
 				return $Block;
 			}
 			elseif ($Line['indent'] < $requiredIndent and $this->blockList($Line))
 			{
 				return null;
 			}
 
 			if ($Line['text'][0] === '[' and $this->blockReference($Line))
 			{
 				return $Block;
 			}
 
 			if ($Line['indent'] >= $requiredIndent)
 			{
 				if (isset($Block['interrupted']))
 				{
 					$Block['li']['handler']['argument'] []= '';
 
 					$Block['loose'] = true;
 
 					unset($Block['interrupted']);
 				}
 
 				$text = substr($Line['body'], $requiredIndent);
 
 				$Block['li']['handler']['argument'] []= $text;
 
 				return $Block;
 			}
 
 			if ( ! isset($Block['interrupted']))
 			{
 				$text = preg_replace('/^[ ]{0,'.$requiredIndent.'}+/', '', $Line['body']);
 
 				$Block['li']['handler']['argument'] []= $text;
 
 				return $Block;
 			}
 		}
 
 		protected function blockListComplete(array $Block)
 		{
 			if (isset($Block['loose']))
 			{
 				foreach ($Block['element']['elements'] as &$li)
 				{
 					if (end($li['handler']['argument']) !== '')
 					{
 						$li['handler']['argument'] []= '';
 					}
 				}
 			}
 
 			return $Block;
 		}
 
 		#
 		# Quote
 
 		protected function blockQuote($Line)
 		{
 			if (preg_match('/^>[ ]?+(.*+)/', $Line['text'], $matches))
 			{
 				$Block = array(
 					'element' => array(
 						'name' => 'blockquote',
 						'handler' => array(
 							'function' => 'linesElements',
 							'argument' => (array) $matches[1],
 							'destination' => 'elements',
 						)
 					),
 				);
 
 				return $Block;
 			}
 		}
 
 		protected function blockQuoteContinue($Line, array $Block)
 		{
 			if (isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			if ($Line['text'][0] === '>' and preg_match('/^>[ ]?+(.*+)/', $Line['text'], $matches))
 			{
 				$Block['element']['handler']['argument'] []= $matches[1];
 
 				return $Block;
 			}
 
 			if ( ! isset($Block['interrupted']))
 			{
 				$Block['element']['handler']['argument'] []= $Line['text'];
 
 				return $Block;
 			}
 		}
 
 		#
 		# Rule
 
 		protected function blockRule($Line)
 		{
 			$marker = $Line['text'][0];
 
 			if (substr_count($Line['text'], $marker) >= 3 and chop($Line['text'], " $marker") === '')
 			{
 				$Block = array(
 					'element' => array(
 						'name' => 'hr',
 					),
 				);
 
 				return $Block;
 			}
 		}
 
 		#
 		# Setext
 
 		protected function blockSetextHeader($Line, array $Block = null)
 		{
 			if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			if ($Line['indent'] < 4 and chop(chop($Line['text'], ' '), $Line['text'][0]) === '')
 			{
 				$Block['element']['name'] = $Line['text'][0] === '=' ? 'h1' : 'h2';
 
 				return $Block;
 			}
 		}
 
 		#
 		# Markup
 
 		protected function blockMarkup($Line)
 		{
 			if ($this->markupEscaped or $this->safeMode)
 			{
 				return;
 			}
 
 			if (preg_match('/^<[\/]?+(\w*)(?:[ ]*+'.$this->regexHtmlAttribute.')*+[ ]*+(\/)?>/', $Line['text'], $matches))
 			{
 				$element = strtolower($matches[1]);
 
 				if (in_array($element, $this->textLevelElements))
 				{
 					return;
 				}
 
 				$Block = array(
 					'name' => $matches[1],
 					'element' => array(
 						'rawHtml' => $Line['text'],
 						'autobreak' => true,
 					),
 				);
 
 				return $Block;
 			}
 		}
 
 		protected function blockMarkupContinue($Line, array $Block)
 		{
 			if (isset($Block['closed']) or isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			$Block['element']['rawHtml'] .= "\n" . $Line['body'];
 
 			return $Block;
 		}
 
 		#
 		# Reference
 
 		protected function blockReference($Line)
 		{
 			if (strpos($Line['text'], ']') !== false
 			    and preg_match('/^\[(.+?)\]:[ ]*+<?(\S+?)>?(?:[ ]+["\'(](.+)["\')])?[ ]*+$/', $Line['text'], $matches)
 			) {
 				$id = strtolower($matches[1]);
 
 				$Data = array(
 					'url' => $matches[2],
 					'title' => isset($matches[3]) ? $matches[3] : null,
 				);
 
 				$this->DefinitionData['Reference'][$id] = $Data;
 
 				$Block = array(
 					'element' => array(),
 				);
 
 				return $Block;
 			}
 		}
 
 		#
 		# Table
 
 		protected function blockTable($Line, array $Block = null)
 		{
 			if ( ! isset($Block) or $Block['type'] !== 'Paragraph' or isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			if (
 				strpos($Block['element']['handler']['argument'], '|') === false
 				and strpos($Line['text'], '|') === false
 				    and strpos($Line['text'], ':') === false
 				or strpos($Block['element']['handler']['argument'], "\n") !== false
 			) {
 				return;
 			}
 
 			if (chop($Line['text'], ' -:|') !== '')
 			{
 				return;
 			}
 
 			$alignments = array();
 
 			$divider = $Line['text'];
 
 			$divider = trim($divider);
 			$divider = trim($divider, '|');
 
 			$dividerCells = explode('|', $divider);
 
 			foreach ($dividerCells as $dividerCell)
 			{
 				$dividerCell = trim($dividerCell);
 
 				if ($dividerCell === '')
 				{
 					return;
 				}
 
 				$alignment = null;
 
 				if ($dividerCell[0] === ':')
 				{
 					$alignment = 'left';
 				}
 
 				if (substr($dividerCell, - 1) === ':')
 				{
 					$alignment = $alignment === 'left' ? 'center' : 'right';
 				}
 
 				$alignments []= $alignment;
 			}
 
 			# ~
 
 			$HeaderElements = array();
 
 			$header = $Block['element']['handler']['argument'];
 
 			$header = trim($header);
 			$header = trim($header, '|');
 
 			$headerCells = explode('|', $header);
 
 			if (count($headerCells) !== count($alignments))
 			{
 				return;
 			}
 
 			foreach ($headerCells as $index => $headerCell)
 			{
 				$headerCell = trim($headerCell);
 
 				$HeaderElement = array(
 					'name' => 'th',
 					'handler' => array(
 						'function' => 'lineElements',
 						'argument' => $headerCell,
 						'destination' => 'elements',
 					)
 				);
 
 				if (isset($alignments[$index]))
 				{
 					$alignment = $alignments[$index];
 
 					$HeaderElement['attributes'] = array(
 						'style' => "text-align: $alignment;",
 					);
 				}
 
 				$HeaderElements []= $HeaderElement;
 			}
 
 			# ~
 
 			$Block = array(
 				'alignments' => $alignments,
 				'identified' => true,
 				'element' => array(
 					'name' => 'table',
 					'elements' => array(),
 				),
 			);
 
 			$Block['element']['elements'] []= array(
 				'name' => 'thead',
 			);
 
 			$Block['element']['elements'] []= array(
 				'name' => 'tbody',
 				'elements' => array(),
 			);
 
 			$Block['element']['elements'][0]['elements'] []= array(
 				'name' => 'tr',
 				'elements' => $HeaderElements,
 			);
 
 			return $Block;
 		}
 
 		protected function blockTableContinue($Line, array $Block)
 		{
 			if (isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			if (count($Block['alignments']) === 1 or $Line['text'][0] === '|' or strpos($Line['text'], '|'))
 			{
 				$Elements = array();
 
 				$row = $Line['text'];
 
 				$row = trim($row);
 				$row = trim($row, '|');
 
 				preg_match_all('/(?:(\\\\[|])|[^|`]|`[^`]++`|`)++/', $row, $matches);
 
 				$cells = array_slice($matches[0], 0, count($Block['alignments']));
 
 				foreach ($cells as $index => $cell)
 				{
 					$cell = trim($cell);
 
 					$Element = array(
 						'name' => 'td',
 						'handler' => array(
 							'function' => 'lineElements',
 							'argument' => $cell,
 							'destination' => 'elements',
 						)
 					);
 
 					if (isset($Block['alignments'][$index]))
 					{
 						$Element['attributes'] = array(
 							'style' => 'text-align: ' . $Block['alignments'][$index] . ';',
 						);
 					}
 
 					$Elements []= $Element;
 				}
 
 				$Element = array(
 					'name' => 'tr',
 					'elements' => $Elements,
 				);
 
 				$Block['element']['elements'][1]['elements'] []= $Element;
 
 				return $Block;
 			}
 		}
 
 		#
 		# ~
 		#
 
 		protected function paragraph($Line)
 		{
 			return array(
 				'type' => 'Paragraph',
 				'element' => array(
 					'name' => 'p',
 					'handler' => array(
 						'function' => 'lineElements',
 						'argument' => $Line['text'],
 						'destination' => 'elements',
 					),
 				),
 			);
 		}
 
 		protected function paragraphContinue($Line, array $Block)
 		{
 			if (isset($Block['interrupted']))
 			{
 				return;
 			}
 
 			$Block['element']['handler']['argument'] .= "\n".$Line['text'];
 
 			return $Block;
 		}
 
 		#
 		# Inline Elements
 		#
 
 		protected $InlineTypes = array(
 			'!' => array('Image'),
 			'&' => array('SpecialCharacter'),
 			'*' => array('Emphasis'),
 			':' => array('Url'),
 			'<' => array('UrlTag', 'EmailTag', 'Markup'),
 			'[' => array('Link'),
 			'_' => array('Emphasis'),
 			'`' => array('Code'),
 			'~' => array('Strikethrough'),
 			'\\' => array('EscapeSequence'),
 		);
 
 		# ~
 
 		protected $inlineMarkerList = '!*_&[:<`~\\';
 
 		#
 		# ~
 		#
 
 		public function line($text, $nonNestables = array())
 		{
 			return $this->elements($this->lineElements($text, $nonNestables));
 		}
 
 		protected function lineElements($text, $nonNestables = array())
 		{
 			# standardize line breaks
 			$text = str_replace(array("\r\n", "\r"), "\n", $text);
 
 			$Elements = array();
 
 			$nonNestables = (empty($nonNestables)
 				? array()
 				: array_combine($nonNestables, $nonNestables)
 			);
 
 			# $excerpt is based on the first occurrence of a marker
 
 			while ($excerpt = strpbrk($text, $this->inlineMarkerList))
 			{
 				$marker = $excerpt[0];
 
 				$markerPosition = strlen($text) - strlen($excerpt);
 
 				$Excerpt = array('text' => $excerpt, 'context' => $text);
 
 				foreach ($this->InlineTypes[$marker] as $inlineType)
 				{
 					# check to see if the current inline type is nestable in the current context
 
 					if (isset($nonNestables[$inlineType]))
 					{
 						continue;
 					}
 
 					$Inline = $this->{"inline$inlineType"}($Excerpt);
 
 					if ( ! isset($Inline))
 					{
 						continue;
 					}
 
 					# makes sure that the inline belongs to "our" marker
 
 					if (isset($Inline['position']) and $Inline['position'] > $markerPosition)
 					{
 						continue;
 					}
 
 					# sets a default inline position
 
 					if ( ! isset($Inline['position']))
 					{
 						$Inline['position'] = $markerPosition;
 					}
 
 					# cause the new element to 'inherit' our non nestables
 
 
 					$Inline['element']['nonNestables'] = isset($Inline['element']['nonNestables'])
 						? array_merge($Inline['element']['nonNestables'], $nonNestables)
 						: $nonNestables
 					;
 
 					# the text that comes before the inline
 					$unmarkedText = substr($text, 0, $Inline['position']);
 
 					# compile the unmarked text
 					$InlineText = $this->inlineText($unmarkedText);
 					$Elements[] = $InlineText['element'];
 
 					# compile the inline
 					$Elements[] = $this->extractElement($Inline);
 
 					# remove the examined text
 					$text = substr($text, $Inline['position'] + $Inline['extent']);
 
 					continue 2;
 				}
 
 				# the marker does not belong to an inline
 
 				$unmarkedText = substr($text, 0, $markerPosition + 1);
 
 				$InlineText = $this->inlineText($unmarkedText);
 				$Elements[] = $InlineText['element'];
 
 				$text = substr($text, $markerPosition + 1);
 			}
 
 			$InlineText = $this->inlineText($text);
 			$Elements[] = $InlineText['element'];
 
 			foreach ($Elements as &$Element)
 			{
 				if ( ! isset($Element['autobreak']))
 				{
 					$Element['autobreak'] = false;
 				}
 			}
 
 			return $Elements;
 		}
 
 		#
 		# ~
 		#
 
 		protected function inlineText($text)
 		{
 			$Inline = array(
 				'extent' => strlen($text),
 				'element' => array(),
 			);
 
 			$Inline['element']['elements'] = self::pregReplaceElements(
 				$this->breaksEnabled ? '/[ ]*+\n/' : '/(?:[ ]*+\\\\|[ ]{2,}+)\n/',
 				array(
 					array('name' => 'br'),
 					array('text' => "\n"),
 				),
 				$text
 			);
 
 			return $Inline;
 		}
 
 		protected function inlineCode($Excerpt)
 		{
 			$marker = $Excerpt['text'][0];
 
 			if (preg_match('/^(['.$marker.']++)[ ]*+(.+?)[ ]*+(?<!['.$marker.'])\1(?!'.$marker.')/s', $Excerpt['text'], $matches))
 			{
 				$text = $matches[2];
 				$text = preg_replace('/[ ]*+\n/', ' ', $text);
 
 				return array(
 					'extent' => strlen($matches[0]),
 					'element' => array(
 						'name' => 'code',
 						'text' => $text,
 					),
 				);
 			}
 		}
 
 		protected function inlineEmailTag($Excerpt)
 		{
 			$hostnameLabel = '[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?';
 
 			$commonMarkEmail = '[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]++@'
 			                   . $hostnameLabel . '(?:\.' . $hostnameLabel . ')*';
 
 			if (strpos($Excerpt['text'], '>') !== false
 			    and preg_match("/^<((mailto:)?$commonMarkEmail)>/i", $Excerpt['text'], $matches)
 			){
 				$url = $matches[1];
 
 				if ( ! isset($matches[2]))
 				{
 					$url = "mailto:$url";
 				}
 
 				return array(
 					'extent' => strlen($matches[0]),
 					'element' => array(
 						'name' => 'a',
 						'text' => $matches[1],
 						'attributes' => array(
 							'href' => $url,
 						),
 					),
 				);
 			}
 		}
 
 		protected function inlineEmphasis($Excerpt)
 		{
 			if ( ! isset($Excerpt['text'][1]))
 			{
 				return;
 			}
 
 			$marker = $Excerpt['text'][0];
 
 			if ($Excerpt['text'][1] === $marker and preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches))
 			{
 				$emphasis = 'strong';
 			}
 			elseif (preg_match($this->EmRegex[$marker], $Excerpt['text'], $matches))
 			{
 				$emphasis = 'em';
 			}
 			else
 			{
 				return;
 			}
 
 			return array(
 				'extent' => strlen($matches[0]),
 				'element' => array(
 					'name' => $emphasis,
 					'handler' => array(
 						'function' => 'lineElements',
 						'argument' => $matches[1],
 						'destination' => 'elements',
 					)
 				),
 			);
 		}
 
 		protected function inlineEscapeSequence($Excerpt)
 		{
 			if (isset($Excerpt['text'][1]) and in_array($Excerpt['text'][1], $this->specialCharacters))
 			{
 				return array(
 					'element' => array('rawHtml' => $Excerpt['text'][1]),
 					'extent' => 2,
 				);
 			}
 		}
 
 		protected function inlineImage($Excerpt)
 		{
 			if ( ! isset($Excerpt['text'][1]) or $Excerpt['text'][1] !== '[')
 			{
 				return;
 			}
 
 			$Excerpt['text']= substr($Excerpt['text'], 1);
 
 			$Link = $this->inlineLink($Excerpt);
 
 			if ($Link === null)
 			{
 				return;
 			}
 
 			$Inline = array(
 				'extent' => $Link['extent'] + 1,
 				'element' => array(
 					'name' => 'img',
 					'attributes' => array(
 						'src' => $Link['element']['attributes']['href'],
 						'alt' => $Link['element']['handler']['argument'],
 					),
 					'autobreak' => true,
 				),
 			);
 
 			$Inline['element']['attributes'] += $Link['element']['attributes'];
 
 			unset($Inline['element']['attributes']['href']);
 
 			return $Inline;
 		}
 
 		protected function inlineLink($Excerpt)
 		{
 			$Element = array(
 				'name' => 'a',
 				'handler' => array(
 					'function' => 'lineElements',
 					'argument' => null,
 					'destination' => 'elements',
 				),
 				'nonNestables' => array('Url', 'Link'),
 				'attributes' => array(
 					'href' => null,
 					'title' => null,
 				),
 			);
 
 			$extent = 0;
 
 			$remainder = $Excerpt['text'];
 
 			if (preg_match('/\[((?:[^][]++|(?R))*+)\]/', $remainder, $matches))
 			{
 				$Element['handler']['argument'] = $matches[1];
 
 				$extent += strlen($matches[0]);
 
 				$remainder = substr($remainder, $extent);
 			}
 			else
 			{
 				return;
 			}
 
 			if (preg_match('/^[(]\s*+((?:[^ ()]++|[(][^ )]+[)])++)(?:[ ]+("[^"]*+"|\'[^\']*+\'))?\s*+[)]/', $remainder, $matches))
 			{
 				$Element['attributes']['href'] = $matches[1];
 
 				if (isset($matches[2]))
 				{
 					$Element['attributes']['title'] = substr($matches[2], 1, - 1);
 				}
 
 				$extent += strlen($matches[0]);
 			}
 			else
 			{
 				if (preg_match('/^\s*\[(.*?)\]/', $remainder, $matches))
 				{
 					$definition = strlen($matches[1]) ? $matches[1] : $Element['handler']['argument'];
 					$definition = strtolower($definition);
 
 					$extent += strlen($matches[0]);
 				}
 				else
 				{
 					$definition = strtolower($Element['handler']['argument']);
 				}
 
 				if ( ! isset($this->DefinitionData['Reference'][$definition]))
 				{
 					return;
 				}
 
 				$Definition = $this->DefinitionData['Reference'][$definition];
 
 				$Element['attributes']['href'] = $Definition['url'];
 				$Element['attributes']['title'] = $Definition['title'];
 			}
 
 			return array(
 				'extent' => $extent,
 				'element' => $Element,
 			);
 		}
 
 		protected function inlineMarkup($Excerpt)
 		{
 			if ($this->markupEscaped or $this->safeMode or strpos($Excerpt['text'], '>') === false)
 			{
 				return;
 			}
 
 			if ($Excerpt['text'][1] === '/' and preg_match('/^<\/\w[\w-]*+[ ]*+>/s', $Excerpt['text'], $matches))
 			{
 				return array(
 					'element' => array('rawHtml' => $matches[0]),
 					'extent' => strlen($matches[0]),
 				);
 			}
 
 			if ($Excerpt['text'][1] === '!' and preg_match('/^<!---?[^>-](?:-?+[^-])*-->/s', $Excerpt['text'], $matches))
 			{
 				return array(
 					'element' => array('rawHtml' => $matches[0]),
 					'extent' => strlen($matches[0]),
 				);
 			}
 
 			if ($Excerpt['text'][1] !== ' ' and preg_match('/^<\w[\w-]*+(?:[ ]*+'.$this->regexHtmlAttribute.')*+[ ]*+\/?>/s', $Excerpt['text'], $matches))
 			{
 				return array(
 					'element' => array('rawHtml' => $matches[0]),
 					'extent' => strlen($matches[0]),
 				);
 			}
 		}
 
 		protected function inlineSpecialCharacter($Excerpt)
 		{
 			if (substr($Excerpt['text'], 1, 1) !== ' ' and strpos($Excerpt['text'], ';') !== false
 			                                               and preg_match('/^&(#?+[0-9a-zA-Z]++);/', $Excerpt['text'], $matches)
 			) {
 				return array(
 					'element' => array('rawHtml' => '&' . $matches[1] . ';'),
 					'extent' => strlen($matches[0]),
 				);
 			}
 
 			return;
 		}
 
 		protected function inlineStrikethrough($Excerpt)
 		{
 			if ( ! isset($Excerpt['text'][1]))
 			{
 				return;
 			}
 
 			if ($Excerpt['text'][1] === '~' and preg_match('/^~~(?=\S)(.+?)(?<=\S)~~/', $Excerpt['text'], $matches))
 			{
 				return array(
 					'extent' => strlen($matches[0]),
 					'element' => array(
 						'name' => 'del',
 						'handler' => array(
 							'function' => 'lineElements',
 							'argument' => $matches[1],
 							'destination' => 'elements',
 						)
 					),
 				);
 			}
 		}
 
 		protected function inlineUrl($Excerpt)
 		{
 			if ($this->urlsLinked !== true or ! isset($Excerpt['text'][2]) or $Excerpt['text'][2] !== '/')
 			{
 				return;
 			}
 
 			if (strpos($Excerpt['context'], 'http') !== false
 			    and preg_match('/\bhttps?+:[\/]{2}[^\s<]+\b\/*+/ui', $Excerpt['context'], $matches, PREG_OFFSET_CAPTURE)
 			) {
 				$url = $matches[0][0];
 
 				$Inline = array(
 					'extent' => strlen($matches[0][0]),
 					'position' => $matches[0][1],
 					'element' => array(
 						'name' => 'a',
 						'text' => $url,
 						'attributes' => array(
 							'href' => $url,
 						),
 					),
 				);
 
 				return $Inline;
 			}
 		}
 
 		protected function inlineUrlTag($Excerpt)
 		{
 			if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<(\w++:\/{2}[^ >]++)>/i', $Excerpt['text'], $matches))
 			{
 				$url = $matches[1];
 
 				return array(
 					'extent' => strlen($matches[0]),
 					'element' => array(
 						'name' => 'a',
 						'text' => $url,
 						'attributes' => array(
 							'href' => $url,
 						),
 					),
 				);
 			}
 		}
 
 		# ~
 
 		protected function unmarkedText($text)
 		{
 			$Inline = $this->inlineText($text);
 			return $this->element($Inline['element']);
 		}
 
 		#
 		# Handlers
 		#
 
 		protected function handle(array $Element)
 		{
 			if (isset($Element['handler']))
 			{
 				if (!isset($Element['nonNestables']))
 				{
 					$Element['nonNestables'] = array();
 				}
 
 				if (is_string($Element['handler']))
 				{
 					$function = $Element['handler'];
 					$argument = $Element['text'];
 					unset($Element['text']);
 					$destination = 'rawHtml';
 				}
 				else
 				{
 					$function = $Element['handler']['function'];
 					$argument = $Element['handler']['argument'];
 					$destination = $Element['handler']['destination'];
 				}
 
 				$Element[$destination] = $this->{$function}($argument, $Element['nonNestables']);
 
 				if ($destination === 'handler')
 				{
 					$Element = $this->handle($Element);
 				}
 
 				unset($Element['handler']);
 			}
 
 			return $Element;
 		}
 
 		protected function handleElementRecursive(array $Element)
 		{
 			return $this->elementApplyRecursive(array($this, 'handle'), $Element);
 		}
 
 		protected function handleElementsRecursive(array $Elements)
 		{
 			return $this->elementsApplyRecursive(array($this, 'handle'), $Elements);
 		}
 
 		protected function elementApplyRecursive($closure, array $Element)
 		{
 			$Element = call_user_func($closure, $Element);
 
 			if (isset($Element['elements']))
 			{
 				$Element['elements'] = $this->elementsApplyRecursive($closure, $Element['elements']);
 			}
 			elseif (isset($Element['element']))
 			{
 				$Element['element'] = $this->elementApplyRecursive($closure, $Element['element']);
 			}
 
 			return $Element;
 		}
 
 		protected function elementApplyRecursiveDepthFirst($closure, array $Element)
 		{
 			if (isset($Element['elements']))
 			{
 				$Element['elements'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['elements']);
 			}
 			elseif (isset($Element['element']))
 			{
 				$Element['element'] = $this->elementsApplyRecursiveDepthFirst($closure, $Element['element']);
 			}
 
 			$Element = call_user_func($closure, $Element);
 
 			return $Element;
 		}
 
 		protected function elementsApplyRecursive($closure, array $Elements)
 		{
 			foreach ($Elements as &$Element)
 			{
 				$Element = $this->elementApplyRecursive($closure, $Element);
 			}
 
 			return $Elements;
 		}
 
 		protected function elementsApplyRecursiveDepthFirst($closure, array $Elements)
 		{
 			foreach ($Elements as &$Element)
 			{
 				$Element = $this->elementApplyRecursiveDepthFirst($closure, $Element);
 			}
 
 			return $Elements;
 		}
 
 		protected function element(array $Element)
 		{
 			if ($this->safeMode)
 			{
 				$Element = $this->sanitiseElement($Element);
 			}
 
 			# identity map if element has no handler
 			$Element = $this->handle($Element);
 
 			$hasName = isset($Element['name']);
 
 			$markup = '';
 
 			if ($hasName)
 			{
 				$markup .= '<' . $Element['name'];
 
 				if (isset($Element['attributes']))
 				{
 					foreach ($Element['attributes'] as $name => $value)
 					{
 						if ($value === null)
 						{
 							continue;
 						}
 
 						$markup .= " $name=\"".self::escape($value).'"';
 					}
 				}
 			}
 
 			$permitRawHtml = false;
 
 			if (isset($Element['text']))
 			{
 				$text = $Element['text'];
 			}
 			// very strongly consider an alternative if you're writing an
 			// extension
 			elseif (isset($Element['rawHtml']))
 			{
 				$text = $Element['rawHtml'];
 
 				$allowRawHtmlInSafeMode = isset($Element['allowRawHtmlInSafeMode']) && $Element['allowRawHtmlInSafeMode'];
 				$permitRawHtml = !$this->safeMode || $allowRawHtmlInSafeMode;
 			}
 
 			$hasContent = isset($text) || isset($Element['element']) || isset($Element['elements']);
 
 			if ($hasContent)
 			{
 				$markup .= $hasName ? '>' : '';
 
 				if (isset($Element['elements']))
 				{
 					$markup .= $this->elements($Element['elements']);
 				}
 				elseif (isset($Element['element']))
 				{
 					$markup .= $this->element($Element['element']);
 				}
 				else
 				{
 					if (!$permitRawHtml)
 					{
 						$markup .= self::escape($text, true);
 					}
 					else
 					{
 						$markup .= $text;
 					}
 				}
 
 				$markup .= $hasName ? '</' . $Element['name'] . '>' : '';
 			}
 			elseif ($hasName)
 			{
 				$markup .= ' />';
 			}
 
 			return $markup;
 		}
 
 		protected function elements(array $Elements)
 		{
 			$markup = '';
 
 			$autoBreak = true;
 
 			foreach ($Elements as $Element)
 			{
 				if (empty($Element))
 				{
 					continue;
 				}
 
 				$autoBreakNext = (isset($Element['autobreak'])
 					? $Element['autobreak'] : isset($Element['name'])
 				);
 				// (autobreak === false) covers both sides of an element
 				$autoBreak = !$autoBreak ? $autoBreak : $autoBreakNext;
 
 				$markup .= ($autoBreak ? "\n" : '') . $this->element($Element);
 				$autoBreak = $autoBreakNext;
 			}
 
 			$markup .= $autoBreak ? "\n" : '';
 
 			return $markup;
 		}
 
 		# ~
 
 		protected function li($lines)
 		{
 			$Elements = $this->linesElements($lines);
 
 			if ( ! in_array('', $lines)
 			     and isset($Elements[0]) and isset($Elements[0]['name'])
 			                                 and $Elements[0]['name'] === 'p'
 			) {
 				unset($Elements[0]['name']);
 			}
 
 			return $Elements;
 		}
 
 		#
 		# AST Convenience
 		#
 
 		/**
 		 * Replace occurrences $regexp with $Elements in $text. Return an array of
 		 * elements representing the replacement.
 		 */
 		protected static function pregReplaceElements($regexp, $Elements, $text)
 		{
 			$newElements = array();
 
 			while (preg_match($regexp, $text, $matches, PREG_OFFSET_CAPTURE))
 			{
 				$offset = $matches[0][1];
 				$before = substr($text, 0, $offset);
 				$after = substr($text, $offset + strlen($matches[0][0]));
 
 				$newElements[] = array('text' => $before);
 
 				foreach ($Elements as $Element)
 				{
 					$newElements[] = $Element;
 				}
 
 				$text = $after;
 			}
 
 			$newElements[] = array('text' => $text);
 
 			return $newElements;
 		}
 
 		#
 		# Deprecated Methods
 		#
 
 		function parse($text)
 		{
 			$markup = $this->text($text);
 
 			return $markup;
 		}
 
 		protected function sanitiseElement(array $Element)
 		{
 			static $goodAttribute = '/^[a-zA-Z0-9][a-zA-Z0-9-_]*+$/';
 			static $safeUrlNameToAtt  = array(
 				'a'   => 'href',
 				'img' => 'src',
 			);
 
 			if ( ! isset($Element['name']))
 			{
 				unset($Element['attributes']);
 				return $Element;
 			}
 
 			if (isset($safeUrlNameToAtt[$Element['name']]))
 			{
 				$Element = $this->filterUnsafeUrlInAttribute($Element, $safeUrlNameToAtt[$Element['name']]);
 			}
 
 			if ( ! empty($Element['attributes']))
 			{
 				foreach ($Element['attributes'] as $att => $val)
 				{
 					# filter out badly parsed attribute
 					if ( ! preg_match($goodAttribute, $att))
 					{
 						unset($Element['attributes'][$att]);
 					}
 					# dump onevent attribute
 					elseif (self::striAtStart($att, 'on'))
 					{
 						unset($Element['attributes'][$att]);
 					}
 				}
 			}
 
 			return $Element;
 		}
 
 		protected function filterUnsafeUrlInAttribute(array $Element, $attribute)
 		{
 			foreach ($this->safeLinksWhitelist as $scheme)
 			{
 				if (self::striAtStart($Element['attributes'][$attribute], $scheme))
 				{
 					return $Element;
 				}
 			}
 
 			$Element['attributes'][$attribute] = str_replace(':', '%3A', $Element['attributes'][$attribute]);
 
 			return $Element;
 		}
 
 		#
 		# Static Methods
 		#
 
 		protected static function escape($text, $allowQuotes = false)
 		{
 			return htmlspecialchars($text, $allowQuotes ? ENT_NOQUOTES : ENT_QUOTES, 'UTF-8');
 		}
 
 		protected static function striAtStart($string, $needle)
 		{
 			$len = strlen($needle);
 
 			if ($len > strlen($string))
 			{
 				return false;
 			}
 			else
 			{
 				return strtolower(substr($string, 0, $len)) === strtolower($needle);
 			}
 		}
 
 		static function instance($name = 'default')
 		{
 			if (isset(self::$instances[$name]))
 			{
 				return self::$instances[$name];
 			}
 
 			$instance = new static();
 
 			self::$instances[$name] = $instance;
 
 			return $instance;
 		}
 
 		private static $instances = array();
 
 		#
 		# Fields
 		#
 
 		protected $DefinitionData;
 
 		#
 		# Read-Only
 
 		protected $specialCharacters = array(
 			'\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!', '|', '~'
 		);
 
 		protected $StrongRegex = array(
 			'*' => '/^[*]{2}((?:\\\\\*|[^*]|[*][^*]*+[*])+?)[*]{2}(?![*])/s',
 			'_' => '/^__((?:\\\\_|[^_]|_[^_]*+_)+?)__(?!_)/us',
 		);
 
 		protected $EmRegex = array(
 			'*' => '/^[*]((?:\\\\\*|[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
 			'_' => '/^_((?:\\\\_|[^_]|__[^_]*__)+?)_(?!_)\b/us',
 		);
 
 		protected $regexHtmlAttribute = '[a-zA-Z_:][\w:.-]*+(?:\s*+=\s*+(?:[^"\'=<>`\s]+|"[^"]*+"|\'[^\']*+\'))?+';
 
 		protected $voidElements = array(
 			'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source',
 		);
 
 		protected $textLevelElements = array(
 			'a', 'br', 'bdo', 'abbr', 'blink', 'nextid', 'acronym', 'basefont',
 			'b', 'em', 'big', 'cite', 'small', 'spacer', 'listing',
 			'i', 'rp', 'del', 'code',          'strike', 'marquee',
 			'q', 'rt', 'ins', 'font',          'strong',
 			's', 'tt', 'kbd', 'mark',
 			'u', 'xm', 'sub', 'nobr',
 			'sup', 'ruby',
 			'var', 'span',
 			'wbr', 'time',
 		);
 	}
 }