From 46e4eae295dd6de002ca1c8d2fe45ee223e9de18 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=AD=99=E5=B9=BF=E6=98=8E?= <sunguangming@cnezsoft.com>
Date: Tue, 17 May 2022 11:15:33 +0800
Subject: [PATCH] * Finish task #54205.

---
 lib/michelf/.github/workflows/ci.yml          |   25 +
 lib/michelf/.scrutinizer.yml                  |   36 +
 lib/michelf/.travis.yml                       |   19 +
 lib/michelf/Michelf/Markdown.inc.php          |   10 +
 lib/michelf/Michelf/Markdown.php              | 1889 ++++++++++++++++
 lib/michelf/Michelf/MarkdownExtra.inc.php     |   11 +
 lib/michelf/Michelf/MarkdownExtra.php         | 1870 ++++++++++++++++
 lib/michelf/Michelf/MarkdownInterface.inc.php |    9 +
 lib/michelf/Michelf/MarkdownInterface.php     |   38 +
 lib/michelf/michelf.class.php                 |   27 +
 lib/parsedownextraplugin/LICENSE.txt          |   20 -
 lib/parsedownextraplugin/parsedown.php        | 1992 -----------------
 lib/parsedownextraplugin/parsedownextra.php   |  686 ------
 .../parsedownextraplugin.class.php            |  590 -----
 module/common/model.php                       |    8 +-
 15 files changed, 3937 insertions(+), 3293 deletions(-)
 create mode 100644 lib/michelf/.github/workflows/ci.yml
 create mode 100644 lib/michelf/.scrutinizer.yml
 create mode 100644 lib/michelf/.travis.yml
 create mode 100644 lib/michelf/Michelf/Markdown.inc.php
 create mode 100644 lib/michelf/Michelf/Markdown.php
 create mode 100644 lib/michelf/Michelf/MarkdownExtra.inc.php
 create mode 100644 lib/michelf/Michelf/MarkdownExtra.php
 create mode 100644 lib/michelf/Michelf/MarkdownInterface.inc.php
 create mode 100644 lib/michelf/Michelf/MarkdownInterface.php
 create mode 100644 lib/michelf/michelf.class.php
 delete mode 100644 lib/parsedownextraplugin/LICENSE.txt
 delete mode 100644 lib/parsedownextraplugin/parsedown.php
 delete mode 100644 lib/parsedownextraplugin/parsedownextra.php
 delete mode 100644 lib/parsedownextraplugin/parsedownextraplugin.class.php

diff --git a/lib/michelf/.github/workflows/ci.yml b/lib/michelf/.github/workflows/ci.yml
new file mode 100644
index 0000000000..6e49b8397b
--- /dev/null
+++ b/lib/michelf/.github/workflows/ci.yml
@@ -0,0 +1,25 @@
+name: CI
+on:
+    pull_request: null
+    push:
+        branches:
+            - lib
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: ['7.4', '8.0']
+
+        name: Linting - PHP ${{ matrix.php }}
+        steps:
+            -   uses: actions/checkout@v2
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    coverage: none
+                    extensions: intl
+            -   run: composer install --no-progress
+#            -   run: composer codestyle
+            -   run: composer phpstan
+            -   run: composer tests
diff --git a/lib/michelf/.scrutinizer.yml b/lib/michelf/.scrutinizer.yml
new file mode 100644
index 0000000000..7542096df5
--- /dev/null
+++ b/lib/michelf/.scrutinizer.yml
@@ -0,0 +1,36 @@
+build:
+  environment:
+    php:
+      version: '7.4'
+  nodes:
+    analysis:
+      project_setup:
+        override:
+          - 'true'
+      tests:
+        override:
+          -
+            command: 'vendor/bin/phpunit --coverage-clover=clover.xml'
+            coverage:
+              file: 'clover.xml'
+              format: 'clover'
+          -
+            command: phpcs-run
+            use_website_config: true
+      environment:
+        node:
+          version: 6.0.0
+    tests: true
+filter:
+  excluded_paths:
+    - 'test/*'
+checks:
+  php: true
+coding_style:
+  php:
+    indentation:
+      general:
+        use_tabs: true
+    spaces:
+      around_operators:
+        concatenation: true
diff --git a/lib/michelf/.travis.yml b/lib/michelf/.travis.yml
new file mode 100644
index 0000000000..5a2a16a4ec
--- /dev/null
+++ b/lib/michelf/.travis.yml
@@ -0,0 +1,19 @@
+language: php
+
+matrix:
+  include:
+    - php: hhvm-3.18
+      dist: trusty
+    - php: 7.4
+      dist: bionic
+    - php: 8.0
+      dist: bionic
+
+install:
+  - composer install --prefer-dist
+
+script:
+  - vendor/bin/phpunit --log-junit=phpunit.log
+
+notifications:
+  email: false
diff --git a/lib/michelf/Michelf/Markdown.inc.php b/lib/michelf/Michelf/Markdown.inc.php
new file mode 100644
index 0000000000..e2bd3808e8
--- /dev/null
+++ b/lib/michelf/Michelf/Markdown.inc.php
@@ -0,0 +1,10 @@
+<?php
+
+// Use this file if you cannot use class autoloading. It will include all the
+// files needed for the Markdown parser.
+//
+// Take a look at the PSR-0-compatible class autoloading implementation
+// in the Readme.php file if you want a simple autoloader setup.
+
+require_once dirname(__FILE__) . '/MarkdownInterface.php';
+require_once dirname(__FILE__) . '/Markdown.php';
diff --git a/lib/michelf/Michelf/Markdown.php b/lib/michelf/Michelf/Markdown.php
new file mode 100644
index 0000000000..e7a5976d97
--- /dev/null
+++ b/lib/michelf/Michelf/Markdown.php
@@ -0,0 +1,1889 @@
+<?php
+/**
+ * Markdown  -  A text-to-HTML conversion tool for web writers
+ *
+ * @package   php-markdown
+ * @author    Michel Fortin <michel.fortin@michelf.com>
+ * @copyright 2004-2019 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
+ */
+
+namespace Michelf;
+
+/**
+ * Markdown Parser Class
+ */
+class Markdown implements MarkdownInterface {
+	/**
+	 * Define the package version
+	 * @var string
+	 */
+	const MARKDOWNLIB_VERSION = "2.0";
+
+	/**
+	 * Simple function interface - Initialize the parser and return the result
+	 * of its transform method. This will work fine for derived classes too.
+	 *
+	 * @api
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	public static function defaultTransform($text) {
+		// Take parser class on which this function was called.
+		$parser_class = static::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.
+	 */
+	public string $empty_element_suffix = " />";
+
+	/**
+	 * The width of indentation of the output markup
+	 */
+	public int $tab_width = 4;
+
+	/**
+	 * Change to `true` to disallow markup or entities.
+	 */
+	public bool $no_markup   = false;
+	public bool $no_entities = false;
+
+
+	/**
+	 * Change to `true` to enable line breaks on \n without two trailling spaces
+	 * @var boolean
+	 */
+	public bool $hard_wrap = false;
+
+	/**
+	 * Predefined URLs and titles for reference links and images.
+	 */
+	public array $predef_urls   = array();
+	public array $predef_titles = array();
+
+	/**
+	 * Optional filter function for URLs
+	 * @var callable|null
+	 */
+	public $url_filter_func = null;
+
+	/**
+	 * Optional header id="" generation callback function.
+	 * @var callable|null
+	 */
+	public $header_id_func = null;
+
+	/**
+	 * Optional function for converting code block content to HTML
+	 * @var callable|null
+	 */
+	public $code_block_content_func = null;
+
+	/**
+	 * Optional function for converting code span content to HTML.
+	 * @var callable|null
+	 */
+	public $code_span_content_func = null;
+
+	/**
+	 * Class attribute to toggle "enhanced ordered list" behaviour
+	 * setting this to true will allow ordered lists to start from the index
+	 * number that is defined first.
+	 *
+	 * For example:
+	 * 2. List item two
+	 * 3. List item three
+	 *
+	 * Becomes:
+	 * <ol start="2">
+	 * <li>List item two</li>
+	 * <li>List item three</li>
+	 * </ol>
+	 */
+	public bool $enhanced_ordered_list = false;
+
+	/**
+	 * Parser implementation
+	 */
+	/**
+	 * Regex to match balanced [brackets].
+	 * Needed to insert a maximum bracked depth while converting to PHP.
+	 */
+	protected int $nested_brackets_depth = 6;
+	protected $nested_brackets_re;
+
+	protected int $nested_url_parenthesis_depth = 4;
+	protected $nested_url_parenthesis_re;
+
+	/**
+	 * Table of hash values for escaped characters:
+	 */
+	protected string $escape_chars = '\`*_{}[]()>#+-.!';
+	protected string $escape_chars_re;
+
+	/**
+	 * Constructor function. Initialize appropriate member variables.
+	 * @return void
+	 */
+	public function __construct() {
+		$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.
+	 */
+	protected array $urls        = array();
+	protected $titles      = array();
+	protected array $html_hashes = array();
+
+	/**
+	 * Status flag to avoid invalid nesting.
+	 */
+	protected bool $in_anchor = false;
+
+	/**
+	 * Status flag to avoid invalid nesting.
+	 */
+	protected bool $in_emphasis_processing = false;
+
+	/**
+	 * Called before the transformation process starts to setup parser states.
+	 * @return void
+	 */
+	protected function setup() {
+		// Clear global hashes.
+		$this->urls        = $this->predef_urls;
+		$this->titles      = $this->predef_titles;
+		$this->html_hashes = array();
+		$this->in_anchor   = false;
+		$this->in_emphasis_processing = false;
+	}
+
+	/**
+	 * Called after the transformation process to clear any variable which may
+	 * be taking up memory unnecessarly.
+	 * @return void
+	 */
+	protected function teardown() {
+		$this->urls        = array();
+		$this->titles      = array();
+		$this->html_hashes = array();
+	}
+
+	/**
+	 * Main function. Performs some preprocessing on the input text and pass
+	 * it through the document gamut.
+	 *
+	 * @api
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	public function transform($text) {
+		$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";
+	}
+
+	/**
+	 * Define the document gamut
+	 */
+	protected array $document_gamut = array(
+		// Strip link definitions, store in hashes.
+		"stripLinkDefinitions" => 20,
+		"runBasicBlockGamut"   => 30,
+	);
+
+	/**
+	 * Strips link definitions from text, stores the URLs and titles in
+	 * hash references
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripLinkDefinitions($text) {
+
+		$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;
+	}
+
+	/**
+	 * The callback to strip link definitions
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripLinkDefinitions_callback($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
+	}
+
+	/**
+	 * Hashify HTML blocks
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function hashHTMLBlocks($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 <p>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|style|form|fieldset|iframe|math|svg|'.
+						   'article|section|nav|aside|hgroup|header|footer|'.
+						   'figure|details|summary';
+
+		// 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)			# Starting on its own line
+				|				# or
+				\A\n?			# the at 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;
+	}
+
+	/**
+	 * The callback for hashing HTML blocks
+	 * @param  string $matches
+	 * @return string
+	 */
+	protected function _hashHTMLBlocks_callback($matches) {
+		$text = $matches[1];
+		$key  = $this->hashBlock($text);
+		return "\n\n$key\n\n";
+	}
+
+	/**
+	 * 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.
+	 *
+	 * @param  string $text
+	 * @param  string $boundary
+	 * @return string
+	 */
+	protected function hashPart($text, $boundary = 'X') {
+		// 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.
+	}
+
+	/**
+	 * Shortcut function for hashPart with block-level boundaries.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function hashBlock($text) {
+		return $this->hashPart($text, 'B');
+	}
+
+	/**
+	 * Define the block gamut - these are all the transformations that form
+	 * block-level tags like paragraphs, headers, and list items.
+	 */
+	protected array $block_gamut = array(
+		"doHeaders"         => 10,
+		"doHorizontalRules" => 20,
+		"doLists"           => 40,
+		"doCodeBlocks"      => 50,
+		"doBlockQuotes"     => 60,
+	);
+
+	/**
+	 * 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.
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function runBlockGamut($text) {
+		$text = $this->hashHTMLBlocks($text);
+		return $this->runBasicBlockGamut($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.
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function runBasicBlockGamut($text) {
+
+		foreach ($this->block_gamut as $method => $priority) {
+			$text = $this->$method($text);
+		}
+
+		// Finally form paragraph and restore hashed blocks.
+		$text = $this->formParagraphs($text);
+
+		return $text;
+	}
+
+	/**
+	 * Convert horizontal rules
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doHorizontalRules($text) {
+		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
+		);
+	}
+
+	/**
+	 * These are all the transformations that occur *within* block-level
+	 * tags like paragraphs, headers, and list items.
+	 */
+	protected array $span_gamut = array(
+		// 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 `<https://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,
+	);
+
+	/**
+	 * Run span gamut transformations
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function runSpanGamut($text) {
+		foreach ($this->span_gamut as $method => $priority) {
+			$text = $this->$method($text);
+		}
+
+		return $text;
+	}
+
+	/**
+	 * Do hard breaks
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doHardBreaks($text) {
+		if ($this->hard_wrap) {
+			return preg_replace_callback('/ *\n/',
+				array($this, '_doHardBreaks_callback'), $text);
+		} else {
+			return preg_replace_callback('/ {2,}\n/',
+				array($this, '_doHardBreaks_callback'), $text);
+		}
+	}
+
+	/**
+	 * Trigger part hashing for the hard break (callback method)
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHardBreaks_callback($matches) {
+		return $this->hashPart("<br$this->empty_element_suffix\n");
+	}
+
+	/**
+	 * Turn Markdown link shortcuts into XHTML <a> tags.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAnchors($text) {
+		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;
+	}
+
+	/**
+	 * Callback method to parse referenced anchors
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAnchors_reference_callback($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 = $this->encodeURLAttribute($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;
+	}
+
+	/**
+	 * Callback method to parse inline anchors
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAnchors_inline_callback($matches) {
+		$link_text		=  $this->runSpanGamut($matches[2]);
+		$url			=  $matches[3] === '' ? $matches[4] : $matches[3];
+		$title			=& $matches[7];
+
+		// If the URL was of the form <s p a c e s> it got caught by the HTML
+		// tag parser and hashed. Need to reverse the process before using
+		// the URL.
+		$unhashed = $this->unhash($url);
+		if ($unhashed !== $url)
+			$url = preg_replace('/^<(.*)>$/', '\1', $unhashed);
+
+		$url = $this->encodeURLAttribute($url);
+
+		$result = "<a href=\"$url\"";
+		if ($title) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\"";
+		}
+
+		$link_text = $this->runSpanGamut($link_text);
+		$result .= ">$link_text</a>";
+
+		return $this->hashPart($result);
+	}
+
+	/**
+	 * Turn Markdown image shortcuts into <img> tags.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doImages($text) {
+		// 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;
+	}
+
+	/**
+	 * Callback to parse references image tags
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doImages_reference_callback($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 = $this->encodeURLAttribute($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;
+	}
+
+	/**
+	 * Callback to parse inline image tags
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doImages_inline_callback($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 = $this->encodeURLAttribute($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);
+	}
+
+	/**
+	 * Parse Markdown heading elements to HTML
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doHeaders($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;
+	}
+
+	/**
+	 * Setext header parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHeaders_callback_setext($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;
+
+		// ID attribute generation
+		$idAtt = $this->_generateIdFromHeaderValue($matches[1]);
+
+		$block = "<h$level$idAtt>".$this->runSpanGamut($matches[1])."</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+	/**
+	 * ATX header parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHeaders_callback_atx($matches) {
+		// ID attribute generation
+		$idAtt = $this->_generateIdFromHeaderValue($matches[2]);
+
+		$level = strlen($matches[1]);
+		$block = "<h$level$idAtt>".$this->runSpanGamut($matches[2])."</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+	/**
+	 * If a header_id_func property is set, we can use it to automatically
+	 * generate an id attribute.
+	 *
+	 * This method returns a string in the form id="foo", or an empty string
+	 * otherwise.
+	 * @param  string $headerValue
+	 * @return string
+	 */
+	protected function _generateIdFromHeaderValue($headerValue) {
+		if (!is_callable($this->header_id_func)) {
+			return "";
+		}
+
+		$idValue = call_user_func($this->header_id_func, $headerValue);
+		if (!$idValue) {
+			return "";
+		}
+
+		return ' id="' . $this->encodeAttribute($idValue) . '"';
+	}
+
+	/**
+	 * Form HTML ordered (numbered) and unordered (bulleted) lists.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doLists($text) {
+		$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+[\.]';
+
+		$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;
+	}
+
+	/**
+	 * List parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doLists_callback($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)";
+		$marker_ol_start_re = '[0-9]+';
+
+		$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);
+
+		$ol_start = 1;
+		if ($this->enhanced_ordered_list) {
+			// Get the start number for ordered list.
+			if ($list_type == 'ol') {
+				$ol_start_array = array();
+				$ol_start_check = preg_match("/$marker_ol_start_re/", $matches[4], $ol_start_array);
+				if ($ol_start_check){
+					$ol_start = $ol_start_array[0];
+				}
+			}
+		}
+
+		if ($ol_start > 1 && $list_type == 'ol'){
+			$result = $this->hashBlock("<$list_type start=\"$ol_start\">\n" . $result . "</$list_type>");
+		} else {
+			$result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
+		}
+		return "\n". $result ."\n\n";
+	}
+
+	/**
+	 * Nesting tracker for list levels
+	 */
+	protected int $list_level = 0;
+
+	/**
+	 * Process the contents of a single ordered or unordered list, splitting it
+	 * into individual list items.
+	 * @param  string $list_str
+	 * @param  string $marker_any_re
+	 * @return string
+	 */
+	protected function processListItems($list_str, $marker_any_re) {
+		/**
+		 * 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;
+	}
+
+	/**
+	 * List item parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _processListItems_callback($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 = $this->formParagraphs($item, false);
+		}
+
+		return "<li>" . $item . "</li>\n";
+	}
+
+	/**
+	 * Process Markdown `<pre><code>` blocks.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doCodeBlocks($text) {
+		$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;
+	}
+
+	/**
+	 * Code block parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doCodeBlocks_callback($matches) {
+		$codeblock = $matches[1];
+
+		$codeblock = $this->outdent($codeblock);
+		if (is_callable($this->code_block_content_func)) {
+			$codeblock = call_user_func($this->code_block_content_func, $codeblock, "");
+		} else {
+			$codeblock = htmlspecialchars($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";
+	}
+
+	/**
+	 * Create a code span markup for $code. Called from handleSpanToken.
+	 * @param  string $code
+	 * @return string
+	 */
+	protected function makeCodeSpan($code) {
+		if (is_callable($this->code_span_content_func)) {
+			$code = call_user_func($this->code_span_content_func, $code);
+		} else {
+			$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
+		}
+		return $this->hashPart("<code>$code</code>");
+	}
+
+	/**
+	 * Define the emphasis operators with their regex matches
+	 * @var array
+	 */
+	protected array $em_relist = array(
+		''  => '(?:(?<!\*)\*(?!\*)|(?<!_)_(?!_))(?![\.,:;]?\s)',
+		'*' => '(?<![\s*])\*(?!\*)',
+		'_' => '(?<![\s_])_(?!_)',
+	);
+
+	/**
+	 * Define the strong operators with their regex matches
+	 * @var array
+	 */
+	protected array $strong_relist = array(
+		''   => '(?:(?<!\*)\*\*(?!\*)|(?<!_)__(?!_))(?![\.,:;]?\s)',
+		'**' => '(?<![\s*])\*\*(?!\*)',
+		'__' => '(?<![\s_])__(?!_)',
+	);
+
+	/**
+	 * Define the emphasis + strong operators with their regex matches
+	 * @var array
+	 */
+	protected array $em_strong_relist = array(
+		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<!_)___(?!_))(?![\.,:;]?\s)',
+		'***' => '(?<![\s*])\*\*\*(?!\*)',
+		'___' => '(?<![\s_])___(?!_)',
+	);
+
+	/**
+	 * Container for prepared regular expressions
+	 */
+	protected ?array $em_strong_prepared_relist = null;
+
+	/**
+	 * Prepare regular expressions for searching emphasis tokens in any
+	 * context.
+	 * @return void
+	 */
+	protected function prepareItalicsAndBold() {
+		foreach ($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;
+			}
+		}
+	}
+
+	/**
+	 * Convert Markdown italics (emphasis) and bold (strong) to HTML
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doItalicsAndBold($text) {
+		if ($this->in_emphasis_processing) {
+			return $text; // avoid reentrency
+		}
+		$this->in_emphasis_processing = true;
+
+		$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);
+					$span = "<strong><em>$span</em></strong>";
+					$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);
+						$em = '';
+					}
+					// Closing strong marker:
+					array_shift($token_stack);
+					$span = array_shift($text_stack);
+					$span = $this->runSpanGamut($span);
+					$span = "<strong>$span</strong>";
+					$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);
+						$span = "<em>$span</em>";
+						$text_stack[0] .= $this->hashPart($span);
+						$em = '';
+					} else {
+						$text_stack[0] .= $token;
+					}
+				} else {
+					array_unshift($token_stack, $token);
+					array_unshift($text_stack, '');
+					$em = $token;
+				}
+			}
+		}
+		$this->in_emphasis_processing = false;
+		return $text_stack[0];
+	}
+
+	/**
+	 * Parse Markdown blockquotes to HTML
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doBlockQuotes($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;
+	}
+
+	/**
+	 * Blockquote parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doBlockQuotes_callback($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";
+	}
+
+	/**
+	 * Blockquote parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doBlockQuotes_callback2($matches) {
+		$pre = $matches[1];
+		$pre = preg_replace('/^  /m', '', $pre);
+		return $pre;
+	}
+
+	/**
+	 * Parse paragraphs
+	 *
+	 * @param  string $text String to process in paragraphs
+	 * @param  boolean $wrap_in_p Whether paragraphs should be wrapped in <p> tags
+	 * @return string
+	 */
+	protected function formParagraphs($text, $wrap_in_p = true) {
+		// Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		// Wrap <p> tags and unhashify HTML blocks
+		foreach ($grafs as $key => $value) {
+			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
+				// Is a paragraph.
+				$value = $this->runSpanGamut($value);
+				if ($wrap_in_p) {
+					$value = preg_replace('/^([ ]*)/', "<p>", $value);
+					$value .= "</p>";
+				}
+				$grafs[$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);
+	}
+
+	/**
+	 * Encode text for a double-quoted HTML attribute. This function
+	 * is *not* suitable for attributes enclosed in single quotes.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function encodeAttribute($text) {
+		$text = $this->encodeAmpsAndAngles($text);
+		$text = str_replace('"', '&quot;', $text);
+		return $text;
+	}
+
+	/**
+	 * Encode text for a double-quoted HTML attribute containing a URL,
+	 * applying the URL filter if set. Also generates the textual
+	 * representation for the URL (removing mailto: or tel:) storing it in $text.
+	 * This function is *not* suitable for attributes enclosed in single quotes.
+	 *
+	 * @param  string $url
+	 * @param  string $text Passed by reference
+	 * @return string        URL
+	 */
+	protected function encodeURLAttribute($url, &$text = null) {
+		if (is_callable($this->url_filter_func)) {
+			$url = call_user_func($this->url_filter_func, $url);
+		}
+
+		if (preg_match('{^mailto:}i', $url)) {
+			$url = $this->encodeEntityObfuscatedAttribute($url, $text, 7);
+		} else if (preg_match('{^tel:}i', $url)) {
+			$url = $this->encodeAttribute($url);
+			$text = substr($url, 4);
+		} else {
+			$url = $this->encodeAttribute($url);
+			$text = $url;
+		}
+
+		return $url;
+	}
+
+	/**
+	 * 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.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function encodeAmpsAndAngles($text) {
+		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;
+	}
+
+	/**
+	 * Parse Markdown automatic links to anchor HTML tags
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAutoLinks($text) {
+		$text = preg_replace_callback('{<((https?|ftp|dict|tel):[^\'">\s]+)>}i',
+			array($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;
+	}
+
+	/**
+	 * Parse URL callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAutoLinks_url_callback($matches) {
+		$url = $this->encodeURLAttribute($matches[1], $text);
+		$link = "<a href=\"$url\">$text</a>";
+		return $this->hashPart($link);
+	}
+
+	/**
+	 * Parse email address callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAutoLinks_email_callback($matches) {
+		$addr = $matches[1];
+		$url = $this->encodeURLAttribute("mailto:$addr", $text);
+		$link = "<a href=\"$url\">$text</a>";
+		return $this->hashPart($link);
+	}
+
+	/**
+	 * Input: some text to obfuscate, e.g. "mailto:foo@example.com"
+	 *
+	 * Output: the same text but with most characters encoded as either a
+	 *         decimal or hex entity, in the hopes of foiling most address
+	 *         harvesting spam bots. E.g.:
+	 *
+	 *        &#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#x66;o&#111;
+	 *        &#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;&#101;&#46;&#x63;&#111;
+	 *        &#x6d;
+	 *
+	 * Note: the additional output $tail is assigned the same value as the
+	 * ouput, minus the number of characters specified by $head_length.
+	 *
+	 * Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
+	 * With some optimizations by Milian Wolff. Forced encoding of HTML
+	 * attribute special characters by Allan Odgaard.
+	 *
+	 * @param  string  $text
+	 * @param  string  $tail Passed by reference
+	 * @param  integer $head_length
+	 * @return string
+	 */
+	protected function encodeEntityObfuscatedAttribute($text, &$tail = null, $head_length = 0) {
+		if ($text == "") {
+			return $tail = "";
+		}
+
+		$chars = preg_split('/(?<!^)(?!$)/', $text);
+		$seed = (int)abs(crc32($text) / strlen($text)); // Deterministic seed.
+
+		foreach ($chars as $key => $char) {
+			$ord = ord($char);
+			// Ignore non-ascii chars.
+			if ($ord < 128) {
+				$r = ($seed * (1 + $key)) % 100; // Pseudo-random function.
+				// roughly 10% raw, 45% hex, 45% dec
+				// '@' *must* be encoded. I insist.
+				// '"' and '>' have to be encoded inside the attribute
+				if ($r > 90 && strpos('@"&>', $char) === false) {
+					/* do nothing */
+				} else if ($r < 45) {
+					$chars[$key] = '&#x'.dechex($ord).';';
+				} else {
+					$chars[$key] = '&#'.$ord.';';
+				}
+			}
+		}
+
+		$text = implode('', $chars);
+		$tail = $head_length ? implode('', array_slice($chars, $head_length)) : $text;
+
+		return $text;
+	}
+
+	/**
+	 * Take the string $str and parse it into tokens, hashing embeded HTML,
+	 * escaped characters and handling code spans.
+	 * @param  string $str
+	 * @return string
+	 */
+	protected function parseSpan($str) {
+		$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;
+	}
+
+	/**
+	 * Handle $token provided by parseSpan by determining its nature and
+	 * returning the corresponding value that should replace it.
+	 * @param  string $token
+	 * @param  string $str Passed by reference
+	 * @return string
+	 */
+	protected function handleSpanToken($token, &$str) {
+		switch ($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);
+		}
+	}
+
+	/**
+	 * Remove one level of line-leading tabs or spaces
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function outdent($text) {
+		return preg_replace('/^(\t|[ ]{1,' . $this->tab_width . '})/m', '', $text);
+	}
+
+
+	/**
+	 * String length function for detab. `_initDetab` will create a function to
+	 * handle UTF-8 if the default function does not exist.
+	 * can be a string or function
+	 */
+	protected $utf8_strlen = 'mb_strlen';
+
+	/**
+	 * Replace tabs with the appropriate amount of spaces.
+	 *
+	 * 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.
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function detab($text) {
+		$text = preg_replace_callback('/^.*\t.*$/m',
+			array($this, '_detab_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Replace tabs callback
+	 * @param  string $matches
+	 * @return string
+	 */
+	protected function _detab_callback($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 $line;
+	}
+
+	/**
+	 * Check for the availability of the function in the `utf8_strlen` property
+	 * (initially `mb_strlen`). If the function is not available, create a
+	 * function that will loosely count the number of UTF-8 characters with a
+	 * regular expression.
+	 * @return void
+	 */
+	protected function _initDetab() {
+
+		if (function_exists($this->utf8_strlen)) {
+			return;
+		}
+
+		$this->utf8_strlen = fn($text) => preg_match_all('/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/', $text, $m);
+	}
+
+	/**
+	 * Swap back in all the tags hashed by _HashHTMLBlocks.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function unhash($text) {
+		return preg_replace_callback('/(.)\x1A[0-9]+\1/',
+			array($this, '_unhash_callback'), $text);
+	}
+
+	/**
+	 * Unhashing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _unhash_callback($matches) {
+		return $this->html_hashes[$matches[0]];
+	}
+}
diff --git a/lib/michelf/Michelf/MarkdownExtra.inc.php b/lib/michelf/Michelf/MarkdownExtra.inc.php
new file mode 100644
index 0000000000..d09bd7a480
--- /dev/null
+++ b/lib/michelf/Michelf/MarkdownExtra.inc.php
@@ -0,0 +1,11 @@
+<?php
+
+// Use this file if you cannot use class autoloading. It will include all the
+// files needed for the MarkdownExtra parser.
+//
+// Take a look at the PSR-0-compatible class autoloading implementation
+// in the Readme.php file if you want a simple autoloader setup.
+
+require_once dirname(__FILE__) . '/MarkdownInterface.php';
+require_once dirname(__FILE__) . '/Markdown.php';
+require_once dirname(__FILE__) . '/MarkdownExtra.php';
diff --git a/lib/michelf/Michelf/MarkdownExtra.php b/lib/michelf/Michelf/MarkdownExtra.php
new file mode 100644
index 0000000000..060a4aecc0
--- /dev/null
+++ b/lib/michelf/Michelf/MarkdownExtra.php
@@ -0,0 +1,1870 @@
+<?php
+/**
+ * Markdown Extra - A text-to-HTML conversion tool for web writers
+ *
+ * @package   php-markdown
+ * @author    Michel Fortin <michel.fortin@michelf.com>
+ * @copyright 2004-2019 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
+ */
+
+namespace Michelf;
+
+/**
+ * Markdown Extra Parser Class
+ */
+class MarkdownExtra extends \Michelf\Markdown {
+	/**
+	 * Configuration variables
+	 */
+	/**
+	 * Prefix for footnote ids.
+	 */
+	public string $fn_id_prefix = "";
+
+	/**
+	 * Optional title attribute for footnote links.
+	 */
+	public string $fn_link_title = "";
+
+	/**
+	 * Optional class attribute for footnote links and backlinks.
+	 */
+	public string $fn_link_class     = "footnote-ref";
+	public string $fn_backlink_class = "footnote-backref";
+
+	/**
+	 * Content to be displayed within footnote backlinks. The default is '↩';
+	 * the U+FE0E on the end is a Unicode variant selector used to prevent iOS
+	 * from displaying the arrow character as an emoji.
+	 * Optionally use '^^' and '%%' to refer to the footnote number and
+	 * reference number respectively. {@see parseFootnotePlaceholders()}
+	 */
+	public string $fn_backlink_html = '&#8617;&#xFE0E;';
+
+	/**
+	 * Optional title and aria-label attributes for footnote backlinks for
+	 * added accessibility (to ensure backlink uniqueness).
+	 * Use '^^' and '%%' to refer to the footnote number and reference number
+	 * respectively. {@see parseFootnotePlaceholders()}
+	 */
+	public string $fn_backlink_title = "";
+	public string $fn_backlink_label = "";
+
+	/**
+	 * Class name for table cell alignment (%% replaced left/center/right)
+	 * For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center'
+	 * If empty, the align attribute is used instead of a class name.
+	 */
+	public string $table_align_class_tmpl = '';
+
+	/**
+	 * Optional class prefix for fenced code block.
+	 */
+	public string $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.
+	 */
+	public bool $code_attr_on_pre = false;
+
+	/**
+	 * Predefined abbreviations.
+	 */
+	public array $predef_abbr = array();
+
+	/**
+	 * Only convert atx-style headers if there's a space between the header and #
+	 */
+	public bool $hashtag_protection = false;
+
+	/**
+	 * Determines whether footnotes should be appended to the end of the document.
+	 * If true, footnote html can be retrieved from $this->footnotes_assembled.
+	 */
+	public bool $omit_footnotes = false;
+
+
+	/**
+	 * After parsing, the HTML for the list of footnotes appears here.
+	 * This is available only if $omit_footnotes == true.
+	 *
+	 * Note: when placing the content of `footnotes_assembled` on the page,
+	 * consider adding the attribute `role="doc-endnotes"` to the `div` or
+	 * `section` that will enclose the list of footnotes so they are
+	 * reachable to accessibility tools the same way they would be with the
+	 * default HTML output.
+	 */
+	public ?string $footnotes_assembled = null;
+
+	/**
+	 * Parser implementation
+	 */
+
+	/**
+	 * Constructor function. Initialize the parser object.
+	 * @return void
+	 */
+	public function __construct() {
+		// 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,
+		);
+
+		$this->enhanced_ordered_list = true;
+		parent::__construct();
+	}
+
+
+	/**
+	 * Extra variables used during extra transformations.
+	 */
+	protected array $footnotes = array();
+	protected array $footnotes_ordered = array();
+	protected array $footnotes_ref_count = array();
+	protected array $footnotes_numbers = array();
+	protected array $abbr_desciptions = array();
+	protected string $abbr_word_re = '';
+
+	/**
+	 * Give the current footnote number.
+	 */
+	protected int $footnote_counter = 1;
+
+    /**
+	 * Ref attribute for links
+	 */
+	protected array $ref_attr = array();
+
+	/**
+	 * Setting up Extra-specific variables.
+	 */
+	protected function setup() {
+		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;
+		$this->footnotes_assembled = null;
+
+		foreach ($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);
+		}
+	}
+
+	/**
+	 * Clearing Extra-specific variables.
+	 */
+	protected function teardown() {
+		$this->footnotes = array();
+		$this->footnotes_ordered = array();
+		$this->footnotes_ref_count = array();
+		$this->footnotes_numbers = array();
+		$this->abbr_desciptions = array();
+		$this->abbr_word_re = '';
+
+		if ( ! $this->omit_footnotes )
+			$this->footnotes_assembled = null;
+
+		parent::teardown();
+	}
+
+
+	/**
+	 * Extra attribute parser
+	 */
+	/**
+	 * Expression to use to catch attributes (includes the braces)
+	 */
+	protected string $id_class_attr_catch_re = '\{((?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,})[ ]*\}';
+
+	/**
+	 * Expression to use when parsing in a context when no capture is desired
+	 */
+	protected string $id_class_attr_nocatch_re = '\{(?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,}[ ]*\}';
+
+	/**
+	 * 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.
+	 *
+	 * In addition, this method also supports supplying a default Id value,
+	 * which will be used to populate the id attribute in case it was not
+	 * overridden.
+	 * @param  string $tag_name
+	 * @param  string $attr
+	 * @param  mixed  $defaultIdValue
+	 * @param  array  $classes
+	 * @return string
+	 */
+	protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $classes = array()) {
+		if (empty($attr) && !$defaultIdValue && empty($classes)) {
+			return "";
+		}
+
+		// Split on components
+		preg_match_all('/[#.a-z][-_:a-zA-Z0-9=]+/', $attr, $matches);
+		$elements = $matches[0];
+
+		// Handle classes and IDs (only first ID taken into account)
+		$attributes = 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);
+			} else if (strpos($element, '=') > 0) {
+				$parts = explode('=', $element, 2);
+				$attributes[] = $parts[0] . '="' . $parts[1] . '"';
+			}
+		}
+
+		if ($id === false || $id === '') {
+			$id = $defaultIdValue;
+		}
+
+		// Compose attributes as string
+		$attr_str = "";
+		if (!empty($id)) {
+			$attr_str .= ' id="'.$this->encodeAttribute($id) .'"';
+		}
+		if (!empty($classes)) {
+			$attr_str .= ' class="'. implode(" ", $classes) . '"';
+		}
+		if (!$this->no_markup && !empty($attributes)) {
+			$attr_str .= ' '.implode(" ", $attributes);
+		}
+		return $attr_str;
+	}
+
+	/**
+	 * Strips link definitions from text, stores the URLs and titles in
+	 * hash references.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripLinkDefinitions($text) {
+		$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 = $4
+								[")]
+								[ ]*
+							)?	# title is optional
+					(?:[ ]* '.$this->id_class_attr_catch_re.' )?  # $5 = extra id & class attr
+							(?:\n+|\Z)
+			}xm',
+			array($this, '_stripLinkDefinitions_callback'),
+			$text);
+		return $text;
+	}
+
+	/**
+	 * Strip link definition callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripLinkDefinitions_callback($matches) {
+		$link_id = strtolower($matches[1]);
+		$url = $matches[2] == '' ? $matches[3] : $matches[2];
+		$this->urls[$link_id] = $url;
+		$this->titles[$link_id] =& $matches[4];
+		$this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]);
+		return ''; // String that will replace the block
+	}
+
+
+	/**
+	 * HTML block parser
+	 */
+	/**
+	 * Tags that are always treated as block tags
+	 */
+	protected string $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|figure|details|summary';
+
+	/**
+	 * Tags treated as block tags only if the opening tag is alone on its line
+	 */
+	protected string $context_block_tags_re = 'script|noscript|style|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
+
+	/**
+	 * Tags where markdown="1" default to span mode:
+	 */
+	protected string $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
+	 */
+	protected string $clean_tags_re = 'script|style|math|svg';
+
+	/**
+	 * Tags that do not need to be closed.
+	 */
+	protected string $auto_close_tags_re = 'hr|img|param|source|track';
+
+	/**
+	 * 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 <p>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!
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function hashHTMLBlocks($text) {
+		if ($this->no_markup) {
+			return $text;
+		}
+
+		// Call the HTML-in-Markdown hasher.
+		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
+
+		return $text;
+	}
+
+	/**
+	 * 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 )
+	 *
+	 * @param  string  $text
+	 * @param  integer $indent
+	 * @param  string  $enclosing_tag_re
+	 * @param  boolean $span
+	 * @return array
+	 */
+	protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
+										$enclosing_tag_re = '', $span = false)
+	{
+
+		if ($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
+				' . ( !$span ? ' # If not in span.
+				|
+					# Indented code block
+					(?: ^[ ]*\n | ^ | \n[ ]*\n )
+					[ ]{' . ($indent + 4) . '}[^\n]* \n
+					(?>
+						(?: [ ]{' . ($indent + 4) . '}[^\n]* | [ ]* ) \n
+					)*
+				|
+					# Fenced code block marker
+					(?<= ^ | \n )
+					[ ]{0,' . ($indent + 3) . '}(?:~{3,}|`{3,})
+					[ ]*
+					(?: \.?[-_:a-zA-Z0-9]+ )? # standalone class name
+					[ ]*
+					(?: ' . $this->id_class_attr_nocatch_re . ' )? # extra attributes
+					[ ]*
+					(?= \n )
+				' : '' ) . ' # End (if not is span).
+				|
+					# Code span marker
+					# Note, this regex needs to go after backtick fenced
+					# code blocks but it should also be kept outside of the
+					# "if not in span" condition adding backticks to the parser
+					`+
+				)
+			}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("", ':');
+				$newline = "\n$void";
+				$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 = $parts[2]; // Remaining text after current tag.
+
+			// Check for: Fenced code block marker.
+			// Note: need to recheck the whole tag to disambiguate backtick
+			// fences from code spans
+			if (preg_match('{^\n?([ ]{0,' . ($indent + 3) . '})(~{3,}|`{3,})[ ]*(?:\.?[-_:a-zA-Z0-9]+)?[ ]*(?:' . $this->id_class_attr_nocatch_re . ')?[ ]*\n?$}', $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 .= $tag;
+			}
+			// Check for: Code span marker
+			// Note: need to check this after backtick fenced code blocks
+			else if ($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: 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);
+	}
+
+	/**
+	 * 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 )
+	 * @param  string $text
+	 * @param  string $hash_method
+	 * @param  bool $md_attr Handle `markdown="1"` attribute
+	 * @return array
+	 */
+	protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
+		if ($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.
+		$base_tag_name_re = '';
+
+		// 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.
+					$mode = $attr_m[2] . $attr_m[3];
+					$span_mode = $mode === 'span' || ($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 .= (string) $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);
+	}
+
+	/**
+	 * 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.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function hashClean($text) {
+		return $this->hashPart($text, 'C');
+	}
+
+	/**
+	 * Turn Markdown link shortcuts into XHTML <a> tags.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAnchors($text) {
+		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
+			  \[
+				(' . $this->nested_brackets_re . ')	# link text = $2
+			  \]
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(.+?)>	# href = $3
+				|
+					(' . $this->nested_url_parenthesis_re . ')	# href = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# Title = $7
+				  \6		# matching quote
+				  [ \n]*	# ignore any spaces/tabs between closing quote and )
+				)?			# title is optional
+			  \)
+			  (?:[ ]? ' . $this->id_class_attr_catch_re . ' )?	 # $8 = id/class attributes
+			)
+			}xs',
+			array($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;
+	}
+
+	/**
+	 * Callback for reference anchors
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAnchors_reference_callback($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 = $this->encodeURLAttribute($url);
+
+			$result = "<a href=\"$url\"";
+			if ( isset( $this->titles[$link_id] ) ) {
+				$title = $this->titles[$link_id];
+				$title = $this->encodeAttribute($title);
+				$result .=  " title=\"$title\"";
+			}
+			if (isset($this->ref_attr[$link_id]))
+				$result .= $this->ref_attr[$link_id];
+
+			$link_text = $this->runSpanGamut($link_text);
+			$result .= ">$link_text</a>";
+			$result = $this->hashPart($result);
+		}
+		else {
+			$result = $whole_match;
+		}
+		return $result;
+	}
+
+	/**
+	 * Callback for inline anchors
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAnchors_inline_callback($matches) {
+		$link_text		=  $this->runSpanGamut($matches[2]);
+		$url			=  $matches[3] === '' ? $matches[4] : $matches[3];
+		$title_quote		=& $matches[6];
+		$title			=& $matches[7];
+		$attr  = $this->doExtraAttributes("a", $dummy =& $matches[8]);
+
+		// if the URL was of the form <s p a c e s> it got caught by the HTML
+		// tag parser and hashed. Need to reverse the process before using the URL.
+		$unhashed = $this->unhash($url);
+		if ($unhashed !== $url)
+			$url = preg_replace('/^<(.*)>$/', '\1', $unhashed);
+
+		$url = $this->encodeURLAttribute($url);
+
+		$result = "<a href=\"$url\"";
+		if (isset($title) && $title_quote) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\"";
+		}
+		$result .= $attr;
+
+		$link_text = $this->runSpanGamut($link_text);
+		$result .= ">$link_text</a>";
+
+		return $this->hashPart($result);
+	}
+
+	/**
+	 * Turn Markdown image shortcuts into <img> tags.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doImages($text) {
+		// 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
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(\S*)>	# src url = $3
+				|
+					(' . $this->nested_url_parenthesis_re . ')	# src url = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# title = $7
+				  \6		# matching quote
+				  [ \n]*
+				)?			# title is optional
+			  \)
+			  (?:[ ]? ' . $this->id_class_attr_catch_re . ' )?	 # $8 = id/class attributes
+			)
+			}xs',
+			array($this, '_doImages_inline_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Callback for referenced images
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doImages_reference_callback($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 = $this->encodeURLAttribute($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\"";
+			}
+			if (isset($this->ref_attr[$link_id])) {
+				$result .= $this->ref_attr[$link_id];
+			}
+			$result .= $this->empty_element_suffix;
+			$result = $this->hashPart($result);
+		}
+		else {
+			// If there's no such link ID, leave intact:
+			$result = $whole_match;
+		}
+
+		return $result;
+	}
+
+	/**
+	 * Callback for inline images
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doImages_inline_callback($matches) {
+		$alt_text		= $matches[2];
+		$url			= $matches[3] === '' ? $matches[4] : $matches[3];
+		$title_quote		=& $matches[6];
+		$title			=& $matches[7];
+		$attr  = $this->doExtraAttributes("img", $dummy =& $matches[8]);
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		$url = $this->encodeURLAttribute($url);
+		$result = "<img src=\"$url\" alt=\"$alt_text\"";
+		if (isset($title) && $title_quote) {
+			$title = $this->encodeAttribute($title);
+			$result .=  " title=\"$title\""; // $title already quoted
+		}
+		$result .= $attr;
+		$result .= $this->empty_element_suffix;
+
+		return $this->hashPart($result);
+	}
+
+	/**
+	 * Process markdown headers. Redefined to add ID and class attribute support.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doHeaders($text) {
+		// 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})	# $1 = string of #\'s
+				[ ]'.($this->hashtag_protection ? '+' : '*').'
+				(.+?)		# $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;
+	}
+
+	/**
+	 * Callback for setext headers
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHeaders_callback_setext($matches) {
+		if ($matches[3] === '-' && preg_match('{^- }', $matches[1])) {
+			return $matches[0];
+		}
+
+		$level = $matches[3][0] === '=' ? 1 : 2;
+
+		$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[1]) : null;
+
+		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[2], $defaultId);
+		$block = "<h$level$attr>" . $this->runSpanGamut($matches[1]) . "</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+	/**
+	 * Callback for atx headers
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHeaders_callback_atx($matches) {
+		$level = strlen($matches[1]);
+
+		$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[2]) : null;
+		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[3], $defaultId);
+		$block = "<h$level$attr>" . $this->runSpanGamut($matches[2]) . "</h$level>";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+	/**
+	 * Form HTML tables.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doTables($text) {
+		$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;
+	}
+
+	/**
+	 * Callback for removing the leading pipe for each row
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doTable_leadingPipe_callback($matches) {
+		$head		= $matches[1];
+		$underline	= $matches[2];
+		$content	= $matches[3];
+
+		$content	= preg_replace('/^ *[|]/m', '', $content);
+
+		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
+	}
+
+	/**
+	 * Make the align attribute in a table
+	 * @param  string $alignname
+	 * @return string
+	 */
+	protected function _doTable_makeAlignAttr($alignname) {
+		if (empty($this->table_align_class_tmpl)) {
+			return " align=\"$alignname\"";
+		}
+
+		$classname = str_replace('%%', $alignname, $this->table_align_class_tmpl);
+		return " class=\"$classname\"";
+	}
+
+	/**
+	 * Calback for processing tables
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doTable_callback($matches) {
+		$head		= $matches[1];
+		$underline	= $matches[2];
+		$content	= $matches[3];
+		$attr       = [];
+
+		// 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] = $this->_doTable_makeAlignAttr('right');
+			else if (preg_match('/^ *:-+: *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('center');
+			else if (preg_match('/^ *:-+ *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('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);
+		$attr       = array_pad($attr, $col_count, '');
+
+		// 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";
+	}
+
+	/**
+	 * Form HTML definition lists.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doDefLists($text) {
+		$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;
+	}
+
+	/**
+	 * Callback for processing definition lists
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doDefLists_callback($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";
+	}
+
+	/**
+	 * Process the contents of a single definition list, splitting it
+	 * into individual term and definition list items.
+	 * @param  string $list_str
+	 * @return string
+	 */
+	protected function processDefListItems($list_str) {
+
+		$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;
+	}
+
+	/**
+	 * Callback for <dt> elements in definition lists
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _processDefListItems_callback_dt($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";
+	}
+
+	/**
+	 * Callback for <dd> elements in definition lists
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _processDefListItems_callback_dd($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";
+	}
+
+	/**
+	 * Adding the fenced code block syntax to regular Markdown:
+	 *
+	 * ~~~
+	 * Code block
+	 * ~~~
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doFencedCodeBlocks($text) {
+
+		$text = preg_replace_callback('{
+				(?:\n|\A)
+				# 1: Opening marker
+				(
+					(?:~{3,}|`{3,}) # 3 or more tildes/backticks.
+				)
+				[ ]*
+				(?:
+					\.?([-_: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;
+	}
+
+	/**
+	 * Callback to process fenced code blocks
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doFencedCodeBlocks_callback($matches) {
+		$classname =& $matches[2];
+		$attrs     =& $matches[3];
+		$codeblock = $matches[4];
+
+		if ($this->code_block_content_func) {
+			$codeblock = call_user_func($this->code_block_content_func, $codeblock, $classname);
+		} else {
+			$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+		}
+
+		$codeblock = preg_replace_callback('/^\n+/',
+			array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
+
+		$classes = array();
+		if ($classname !== "") {
+			if ($classname[0] === '.') {
+				$classname = substr($classname, 1);
+			}
+			$classes[] = $this->code_class_prefix . $classname;
+		}
+		$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs, null, $classes);
+		$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";
+	}
+
+	/**
+	 * Replace new lines in fenced code blocks
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doFencedCodeBlocks_newlines($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 array
+	 */
+	protected array $em_relist = array(
+		''  => '(?:(?<!\*)\*(?!\*)|(?<![a-zA-Z0-9_])_(?!_))(?![\.,:;]?\s)',
+		'*' => '(?<![\s*])\*(?!\*)',
+		'_' => '(?<![\s_])_(?![a-zA-Z0-9_])',
+	);
+	protected array $strong_relist = array(
+		''   => '(?:(?<!\*)\*\*(?!\*)|(?<![a-zA-Z0-9_])__(?!_))(?![\.,:;]?\s)',
+		'**' => '(?<![\s*])\*\*(?!\*)',
+		'__' => '(?<![\s_])__(?![a-zA-Z0-9_])',
+	);
+	protected array $em_strong_relist = array(
+		''    => '(?:(?<!\*)\*\*\*(?!\*)|(?<![a-zA-Z0-9_])___(?!_))(?![\.,:;]?\s)',
+		'***' => '(?<![\s*])\*\*\*(?!\*)',
+		'___' => '(?<![\s_])___(?![a-zA-Z0-9_])',
+	);
+
+	/**
+	 * Parse text into paragraphs
+	 * @param  string $text String to process in paragraphs
+	 * @param  boolean $wrap_in_p Whether paragraphs should be wrapped in <p> tags
+	 * @return string       HTML output
+	 */
+	protected function formParagraphs($text, $wrap_in_p = true) {
+		// Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		// Wrap <p> tags and unhashify HTML blocks
+		foreach ($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 = $wrap_in_p && !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
+
+			if ($is_p) {
+				$value = "<p>$value</p>";
+			}
+			$grafs[$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 - Strips link definitions from text, stores the URLs and
+	 * titles in hash references.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripFootnotes($text) {
+		$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 or link definition marker.
+					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
+									# by non-indented content
+				)*
+			)
+			}xm',
+			array($this, '_stripFootnotes_callback'),
+			$text);
+		return $text;
+	}
+
+	/**
+	 * Callback for stripping footnotes
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripFootnotes_callback($matches) {
+		$note_id = $this->fn_id_prefix . $matches[1];
+		$this->footnotes[$note_id] = $this->outdent($matches[2]);
+		return ''; // String that will replace the block
+	}
+
+	/**
+	 * Replace footnote references in $text [^id] with a special text-token
+	 * which will be replaced by the actual footnote marker in appendFootnotes.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doFootnotes($text) {
+		if (!$this->in_anchor) {
+			$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
+		}
+		return $text;
+	}
+
+	/**
+	 * Append footnote list to text
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function appendFootnotes($text) {
+		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
+			array($this, '_appendFootnotes_callback'), $text);
+
+		if ( ! empty( $this->footnotes_ordered ) ) {
+			$this->_doFootnotes();
+			if ( ! $this->omit_footnotes ) {
+				$text .= "\n\n";
+				$text .= "<div class=\"footnotes\" role=\"doc-endnotes\">\n";
+				$text .= "<hr" . $this->empty_element_suffix . "\n";
+				$text .= $this->footnotes_assembled;
+				$text .= "</div>";
+			}
+		}
+		return $text;
+	}
+
+
+	/**
+	 * Generates the HTML for footnotes.  Called by appendFootnotes, even if
+	 * footnotes are not being appended.
+	 * @return void
+	 */
+	protected function _doFootnotes() {
+		$attr = array();
+		if ($this->fn_backlink_class !== "") {
+			$class = $this->fn_backlink_class;
+			$class = $this->encodeAttribute($class);
+			$attr['class'] = " class=\"$class\"";
+		}
+		$attr['role'] = " role=\"doc-backlink\"";
+		$num = 0;
+
+		$text = "<ol>\n\n";
+		while (!empty($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);
+
+			$num++;
+			$note_id = $this->encodeAttribute($note_id);
+
+			// Prepare backlink, multiple backlinks if multiple references
+			// Do not create empty backlinks if the html is blank
+			$backlink = "";
+			if (!empty($this->fn_backlink_html)) {
+				for ($ref_num = 1; $ref_num <= $ref_count; ++$ref_num) {
+					if (!empty($this->fn_backlink_title)) {
+						$attr['title'] = ' title="' . $this->encodeAttribute($this->fn_backlink_title) . '"';
+					}
+					if (!empty($this->fn_backlink_label)) {
+						$attr['label'] = ' aria-label="' . $this->encodeAttribute($this->fn_backlink_label) . '"';
+					}
+					$parsed_attr = $this->parseFootnotePlaceholders(
+						implode('', $attr),
+						$num,
+						$ref_num
+					);
+					$backlink_text = $this->parseFootnotePlaceholders(
+						$this->fn_backlink_html,
+						$num,
+						$ref_num
+					);
+					$ref_count_mark = $ref_num > 1 ? $ref_num : '';
+					$backlink .= " <a href=\"#fnref$ref_count_mark:$note_id\"$parsed_attr>$backlink_text</a>";
+				}
+				$backlink = trim($backlink);
+			}
+
+			// Add backlink to last paragraph; create new paragraph if needed.
+			if (!empty($backlink)) {
+				if (preg_match('{</p>$}', $footnote)) {
+					$footnote = substr($footnote, 0, -4) . "&#160;$backlink</p>";
+				} else {
+					$footnote .= "\n\n<p>$backlink</p>";
+				}
+			}
+
+			$text .= "<li id=\"fn:$note_id\" role=\"doc-endnote\">\n";
+			$text .= $footnote . "\n";
+			$text .= "</li>\n\n";
+		}
+		$text .= "</ol>\n";
+
+		$this->footnotes_assembled = $text;
+	}
+
+	/**
+	 * Callback for appending footnotes
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _appendFootnotes_callback($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;
+			}
+
+			$attr = "";
+			if ($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 .= " role=\"doc-noteref\"";
+
+			$attr = str_replace("%%", $num, $attr);
+			$node_id = $this->encodeAttribute($node_id);
+
+			return
+				"<sup id=\"fnref$ref_count_mark:$node_id\">".
+				"<a href=\"#fn:$node_id\"$attr>$num</a>".
+				"</sup>";
+		}
+
+		return "[^" . $matches[1] . "]";
+	}
+
+	/**
+	 * Build footnote label by evaluating any placeholders.
+	 * - ^^  footnote number
+	 * - %%  footnote reference number (Nth reference to footnote number)
+	 * @param  string $label
+	 * @param  int    $footnote_number
+	 * @param  int    $reference_number
+	 * @return string
+	 */
+	protected function parseFootnotePlaceholders($label, $footnote_number, $reference_number) {
+		return str_replace(
+			array('^^', '%%'),
+			array($footnote_number, $reference_number),
+			$label
+		);
+	}
+
+
+	/**
+	 * Abbreviations - strips abbreviations from text, stores titles in hash
+	 * references.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripAbbreviations($text) {
+		$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;
+	}
+
+	/**
+	 * Callback for stripping abbreviations
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripAbbreviations_callback($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
+	}
+
+	/**
+	 * Find defined abbreviations in text and wrap them in <abbr> elements.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAbbreviations($text) {
+		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;
+	}
+
+	/**
+	 * Callback for processing abbreviations
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAbbreviations_callback($matches) {
+		$abbr = $matches[0];
+		if (isset($this->abbr_desciptions[$abbr])) {
+			$desc = $this->abbr_desciptions[$abbr];
+			if (empty($desc)) {
+				return $this->hashPart("<abbr>$abbr</abbr>");
+			}
+			$desc = $this->encodeAttribute($desc);
+			return $this->hashPart("<abbr title=\"$desc\">$abbr</abbr>");
+		}
+		return $matches[0];
+	}
+}
diff --git a/lib/michelf/Michelf/MarkdownInterface.inc.php b/lib/michelf/Michelf/MarkdownInterface.inc.php
new file mode 100644
index 0000000000..c4e9ac7f64
--- /dev/null
+++ b/lib/michelf/Michelf/MarkdownInterface.inc.php
@@ -0,0 +1,9 @@
+<?php
+
+// Use this file if you cannot use class autoloading. It will include all the
+// files needed for the MarkdownInterface interface.
+//
+// Take a look at the PSR-0-compatible class autoloading implementation
+// in the Readme.php file if you want a simple autoloader setup.
+
+require_once dirname(__FILE__) . '/MarkdownInterface.php';
diff --git a/lib/michelf/Michelf/MarkdownInterface.php b/lib/michelf/Michelf/MarkdownInterface.php
new file mode 100644
index 0000000000..32069dff2b
--- /dev/null
+++ b/lib/michelf/Michelf/MarkdownInterface.php
@@ -0,0 +1,38 @@
+<?php
+/**
+ * Markdown  -  A text-to-HTML conversion tool for web writers
+ *
+ * @package   php-markdown
+ * @author    Michel Fortin <michel.fortin@michelf.com>
+ * @copyright 2004-2021 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
+ */
+
+namespace Michelf;
+
+/**
+ * Markdown Parser Interface
+ */
+interface MarkdownInterface {
+	/**
+	 * Initialize the parser and return the result of its transform method.
+	 * This will work fine for derived classes too.
+	 *
+	 * @api
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	public static function defaultTransform($text);
+
+	/**
+	 * Main function. Performs some preprocessing on the input text
+	 * and pass it through the document gamut.
+	 *
+	 * @api
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	public function transform($text);
+}
diff --git a/lib/michelf/michelf.class.php b/lib/michelf/michelf.class.php
new file mode 100644
index 0000000000..6f55684fb5
--- /dev/null
+++ b/lib/michelf/michelf.class.php
@@ -0,0 +1,27 @@
+<?php
+require_once 'Michelf/MarkdownExtra.inc.php';
+use Michelf\Markdown;
+use Michelf\MarkdownExtra;
+
+class michelf 
+{
+    /**
+     * Convert markdown to html parser.
+     * 
+     * @param  string $mdCodes 
+     * @static
+     * @access public
+     * @return void
+     */
+    public static function parse($mdCodes = '')
+    {
+        if(strlen($mdCodes) == 0) return '';
+        $html    = Markdown::defaultTransform($mdCodes);
+        $parser  = new MarkdownExtra;
+
+        $parser->fn_id_prefix = "post22-";
+        $html    = $parser->transform($mdCodes);
+
+        return "<div class='markdown-print'>$html</div>";
+    }
+}
diff --git a/lib/parsedownextraplugin/LICENSE.txt b/lib/parsedownextraplugin/LICENSE.txt
deleted file mode 100644
index 8e7c764d16..0000000000
--- a/lib/parsedownextraplugin/LICENSE.txt
+++ /dev/null
@@ -1,20 +0,0 @@
-The MIT License (MIT)
-
-Copyright (c) 2013-2018 Emanuil Rusev, erusev.com
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of
-this software and associated documentation files (the "Software"), to deal in
-the Software without restriction, including without limitation the rights to
-use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software is furnished to do so,
-subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
-FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
-COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
-IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
-CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/lib/parsedownextraplugin/parsedown.php b/lib/parsedownextraplugin/parsedown.php
deleted file mode 100644
index 69147dc2ac..0000000000
--- a/lib/parsedownextraplugin/parsedown.php
+++ /dev/null
@@ -1,1992 +0,0 @@
-<?php
-# From: https://github.com/erusev/parsedown.
-#
-# Parsedown
-# http://parsedown.org
-#
-# (c) Emanuil Rusev
-# http://erusev.com
-#
-# For the full license information, view the LICENSE file that was distributed
-# with this source code.
-#
-#
-class parsedown
-{
-    # ~
-
-    const version = '1.8.0-beta-7';
-
-    # ~
-
-    function text($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',
-    );
-}
diff --git a/lib/parsedownextraplugin/parsedownextra.php b/lib/parsedownextraplugin/parsedownextra.php
deleted file mode 100644
index 2eeeda6e0b..0000000000
--- a/lib/parsedownextraplugin/parsedownextra.php
+++ /dev/null
@@ -1,686 +0,0 @@
-<?php
-
-#
-#
-# Parsedown Extra
-# https://github.com/erusev/parsedown-extra
-#
-# (c) Emanuil Rusev
-# http://erusev.com
-#
-# For the full license information, view the LICENSE file that was distributed
-# with this source code.
-#
-#
-
-class parsedownextra extends parsedown
-{
-    # ~
-
-    const version = '0.8.0';
-
-    # ~
-
-    function __construct()
-    {
-        if (version_compare(parent::version, '1.7.1') < 0)
-        {
-            throw new Exception('ParsedownExtra requires a later version of Parsedown');
-        }
-
-        $this->BlockTypes[':'] []= 'DefinitionList';
-        $this->BlockTypes['*'] []= 'Abbreviation';
-
-        # identify footnote definitions before reference definitions
-        array_unshift($this->BlockTypes['['], 'Footnote');
-
-        # identify footnote markers before before links
-        array_unshift($this->InlineTypes['['], 'FootnoteMarker');
-    }
-
-    #
-    # ~
-
-    function text($text)
-    {
-        $Elements = $this->textElements($text);
-
-        # convert to markup
-        $markup = $this->elements($Elements);
-
-        # trim line breaks
-        $markup = trim($markup, "\n");
-
-        # merge consecutive dl elements
-
-        $markup = preg_replace('/<\/dl>\s+<dl>\s+/', '', $markup);
-
-        # add footnotes
-
-        if (isset($this->DefinitionData['Footnote']))
-        {
-            $Element = $this->buildFootnoteElement();
-
-            $markup .= "\n" . $this->element($Element);
-        }
-
-        return $markup;
-    }
-
-    #
-    # Blocks
-    #
-
-    #
-    # Abbreviation
-
-    protected function blockAbbreviation($Line)
-    {
-        if (preg_match('/^\*\[(.+?)\]:[ ]*(.+?)[ ]*$/', $Line['text'], $matches))
-        {
-            $this->DefinitionData['Abbreviation'][$matches[1]] = $matches[2];
-
-            $Block = array(
-                'hidden' => true,
-            );
-
-            return $Block;
-        }
-    }
-
-    #
-    # Footnote
-
-    protected function blockFootnote($Line)
-    {
-        if (preg_match('/^\[\^(.+?)\]:[ ]?(.*)$/', $Line['text'], $matches))
-        {
-            $Block = array(
-                'label' => $matches[1],
-                'text' => $matches[2],
-                'hidden' => true,
-            );
-
-            return $Block;
-        }
-    }
-
-    protected function blockFootnoteContinue($Line, $Block)
-    {
-        if ($Line['text'][0] === '[' and preg_match('/^\[\^(.+?)\]:/', $Line['text']))
-        {
-            return;
-        }
-
-        if (isset($Block['interrupted']))
-        {
-            if ($Line['indent'] >= 4)
-            {
-                $Block['text'] .= "\n\n" . $Line['text'];
-
-                return $Block;
-            }
-        }
-        else
-        {
-            $Block['text'] .= "\n" . $Line['text'];
-
-            return $Block;
-        }
-    }
-
-    protected function blockFootnoteComplete($Block)
-    {
-        $this->DefinitionData['Footnote'][$Block['label']] = array(
-            'text' => $Block['text'],
-            'count' => null,
-            'number' => null,
-        );
-
-        return $Block;
-    }
-
-    #
-    # Definition List
-
-    protected function blockDefinitionList($Line, $Block)
-    {
-        if ( ! isset($Block) or $Block['type'] !== 'Paragraph')
-        {
-            return;
-        }
-
-        $Element = array(
-            'name' => 'dl',
-            'elements' => array(),
-        );
-
-        $terms = explode("\n", $Block['element']['handler']['argument']);
-
-        foreach ($terms as $term)
-        {
-            $Element['elements'] []= array(
-                'name' => 'dt',
-                'handler' => array(
-                    'function' => 'lineElements',
-                    'argument' => $term,
-                    'destination' => 'elements'
-                ),
-            );
-        }
-
-        $Block['element'] = $Element;
-
-        $Block = $this->addDdElement($Line, $Block);
-
-        return $Block;
-    }
-
-    protected function blockDefinitionListContinue($Line, array $Block)
-    {
-        if ($Line['text'][0] === ':')
-        {
-            $Block = $this->addDdElement($Line, $Block);
-
-            return $Block;
-        }
-        else
-        {
-            if (isset($Block['interrupted']) and $Line['indent'] === 0)
-            {
-                return;
-            }
-
-            if (isset($Block['interrupted']))
-            {
-                $Block['dd']['handler']['function'] = 'textElements';
-                $Block['dd']['handler']['argument'] .= "\n\n";
-
-                $Block['dd']['handler']['destination'] = 'elements';
-
-                unset($Block['interrupted']);
-            }
-
-            $text = substr($Line['body'], min($Line['indent'], 4));
-
-            $Block['dd']['handler']['argument'] .= "\n" . $text;
-
-            return $Block;
-        }
-    }
-
-    #
-    # Header
-
-    protected function blockHeader($Line)
-    {
-        $Block = parent::blockHeader($Line);
-
-        if ($Block !== null && preg_match('/[ #]*{('.$this->regexAttribute.'+)}[ ]*$/', $Block['element']['handler']['argument'], $matches, PREG_OFFSET_CAPTURE))
-        {
-            $attributeString = $matches[1][0];
-
-            $Block['element']['attributes'] = $this->parseAttributeData($attributeString);
-
-            $Block['element']['handler']['argument'] = substr($Block['element']['handler']['argument'], 0, $matches[0][1]);
-        }
-
-        return $Block;
-    }
-
-    #
-    # Markup
-
-    protected function blockMarkup($Line)
-    {
-        if ($this->markupEscaped or $this->safeMode)
-        {
-            return;
-        }
-
-        if (preg_match('/^<(\w[\w-]*)(?:[ ]*'.$this->regexHtmlAttribute.')*[ ]*(\/)?>/', $Line['text'], $matches))
-        {
-            $element = strtolower($matches[1]);
-
-            if (in_array($element, $this->textLevelElements))
-            {
-                return;
-            }
-
-            $Block = array(
-                'name' => $matches[1],
-                'depth' => 0,
-                'element' => array(
-                    'rawHtml' => $Line['text'],
-                    'autobreak' => true,
-                ),
-            );
-
-            $length = strlen($matches[0]);
-            $remainder = substr($Line['text'], $length);
-
-            if (trim($remainder) === '')
-            {
-                if (isset($matches[2]) or in_array($matches[1], $this->voidElements))
-                {
-                    $Block['closed'] = true;
-                    $Block['void'] = true;
-                }
-            }
-            else
-            {
-                if (isset($matches[2]) or in_array($matches[1], $this->voidElements))
-                {
-                    return;
-                }
-                if (preg_match('/<\/'.$matches[1].'>[ ]*$/i', $remainder))
-                {
-                    $Block['closed'] = true;
-                }
-            }
-
-            return $Block;
-        }
-    }
-
-    protected function blockMarkupContinue($Line, array $Block)
-    {
-        if (isset($Block['closed']))
-        {
-            return;
-        }
-
-        if (preg_match('/^<'.$Block['name'].'(?:[ ]*'.$this->regexHtmlAttribute.')*[ ]*>/i', $Line['text'])) # open
-        {
-            $Block['depth'] ++;
-        }
-
-        if (preg_match('/(.*?)<\/'.$Block['name'].'>[ ]*$/i', $Line['text'], $matches)) # close
-        {
-            if ($Block['depth'] > 0)
-            {
-                $Block['depth'] --;
-            }
-            else
-            {
-                $Block['closed'] = true;
-            }
-        }
-
-        if (isset($Block['interrupted']))
-        {
-            $Block['element']['rawHtml'] .= "\n";
-            unset($Block['interrupted']);
-        }
-
-        $Block['element']['rawHtml'] .= "\n".$Line['body'];
-
-        return $Block;
-    }
-
-    protected function blockMarkupComplete($Block)
-    {
-        if ( ! isset($Block['void']))
-        {
-            $Block['element']['rawHtml'] = $this->processTag($Block['element']['rawHtml']);
-        }
-
-        return $Block;
-    }
-
-    #
-    # Setext
-
-    protected function blockSetextHeader($Line, array $Block = null)
-    {
-        $Block = parent::blockSetextHeader($Line, $Block);
-
-        if ($Block !== null && preg_match('/[ ]*{('.$this->regexAttribute.'+)}[ ]*$/', $Block['element']['handler']['argument'], $matches, PREG_OFFSET_CAPTURE))
-        {
-            $attributeString = $matches[1][0];
-
-            $Block['element']['attributes'] = $this->parseAttributeData($attributeString);
-
-            $Block['element']['handler']['argument'] = substr($Block['element']['handler']['argument'], 0, $matches[0][1]);
-        }
-
-        return $Block;
-    }
-
-    #
-    # Inline Elements
-    #
-
-    #
-    # Footnote Marker
-
-    protected function inlineFootnoteMarker($Excerpt)
-    {
-        if (preg_match('/^\[\^(.+?)\]/', $Excerpt['text'], $matches))
-        {
-            $name = $matches[1];
-
-            if ( ! isset($this->DefinitionData['Footnote'][$name]))
-            {
-                return;
-            }
-
-            $this->DefinitionData['Footnote'][$name]['count'] ++;
-
-            if ( ! isset($this->DefinitionData['Footnote'][$name]['number']))
-            {
-                $this->DefinitionData['Footnote'][$name]['number'] = ++ $this->footnoteCount; # » &
-            }
-
-            $Element = array(
-                'name' => 'sup',
-                'attributes' => array('id' => 'fnref'.$this->DefinitionData['Footnote'][$name]['count'].':'.$name),
-                'element' => array(
-                    'name' => 'a',
-                    'attributes' => array('href' => '#fn:'.$name, 'class' => 'footnote-ref'),
-                    'text' => $this->DefinitionData['Footnote'][$name]['number'],
-                ),
-            );
-
-            return array(
-                'extent' => strlen($matches[0]),
-                'element' => $Element,
-            );
-        }
-    }
-
-    private $footnoteCount = 0;
-
-    #
-    # Link
-
-    protected function inlineLink($Excerpt)
-    {
-        $Link = parent::inlineLink($Excerpt);
-
-        $remainder = $Link !== null ? substr($Excerpt['text'], $Link['extent']) : '';
-
-        if (preg_match('/^[ ]*{('.$this->regexAttribute.'+)}/', $remainder, $matches))
-        {
-            $Link['element']['attributes'] += $this->parseAttributeData($matches[1]);
-
-            $Link['extent'] += strlen($matches[0]);
-        }
-
-        return $Link;
-    }
-
-    #
-    # ~
-    #
-
-    private $currentAbreviation;
-    private $currentMeaning;
-
-    protected function insertAbreviation(array $Element)
-    {
-        if (isset($Element['text']))
-        {
-            $Element['elements'] = self::pregReplaceElements(
-                '/\b'.preg_quote($this->currentAbreviation, '/').'\b/',
-                array(
-                    array(
-                        'name' => 'abbr',
-                        'attributes' => array(
-                            'title' => $this->currentMeaning,
-                        ),
-                        'text' => $this->currentAbreviation,
-                    )
-                ),
-                $Element['text']
-            );
-
-            unset($Element['text']);
-        }
-
-        return $Element;
-    }
-
-    protected function inlineText($text)
-    {
-        $Inline = parent::inlineText($text);
-
-        if (isset($this->DefinitionData['Abbreviation']))
-        {
-            foreach ($this->DefinitionData['Abbreviation'] as $abbreviation => $meaning)
-            {
-                $this->currentAbreviation = $abbreviation;
-                $this->currentMeaning = $meaning;
-
-                $Inline['element'] = $this->elementApplyRecursiveDepthFirst(
-                    array($this, 'insertAbreviation'),
-                    $Inline['element']
-                );
-            }
-        }
-
-        return $Inline;
-    }
-
-    #
-    # Util Methods
-    #
-
-    protected function addDdElement(array $Line, array $Block)
-    {
-        $text = substr($Line['text'], 1);
-        $text = trim($text);
-
-        unset($Block['dd']);
-
-        $Block['dd'] = array(
-            'name' => 'dd',
-            'handler' => array(
-                'function' => 'lineElements',
-                'argument' => $text,
-                'destination' => 'elements'
-            ),
-        );
-
-        if (isset($Block['interrupted']))
-        {
-            $Block['dd']['handler']['function'] = 'textElements';
-
-            unset($Block['interrupted']);
-        }
-
-        $Block['element']['elements'] []= & $Block['dd'];
-
-        return $Block;
-    }
-
-    protected function buildFootnoteElement()
-    {
-        $Element = array(
-            'name' => 'div',
-            'attributes' => array('class' => 'footnotes'),
-            'elements' => array(
-                array('name' => 'hr'),
-                array(
-                    'name' => 'ol',
-                    'elements' => array(),
-                ),
-            ),
-        );
-
-        uasort($this->DefinitionData['Footnote'], 'self::sortFootnotes');
-
-        foreach ($this->DefinitionData['Footnote'] as $definitionId => $DefinitionData)
-        {
-            if ( ! isset($DefinitionData['number']))
-            {
-                continue;
-            }
-
-            $text = $DefinitionData['text'];
-
-            $textElements = parent::textElements($text);
-
-            $numbers = range(1, $DefinitionData['count']);
-
-            $backLinkElements = array();
-
-            foreach ($numbers as $number)
-            {
-                $backLinkElements[] = array('text' => ' ');
-                $backLinkElements[] = array(
-                    'name' => 'a',
-                    'attributes' => array(
-                        'href' => "#fnref$number:$definitionId",
-                        'rev' => 'footnote',
-                        'class' => 'footnote-backref',
-                    ),
-                    'rawHtml' => '&#8617;',
-                    'allowRawHtmlInSafeMode' => true,
-                    'autobreak' => false,
-                );
-            }
-
-            unset($backLinkElements[0]);
-
-            $n = count($textElements) -1;
-
-            if ($textElements[$n]['name'] === 'p')
-            {
-                $backLinkElements = array_merge(
-                    array(
-                        array(
-                            'rawHtml' => '&#160;',
-                            'allowRawHtmlInSafeMode' => true,
-                        ),
-                    ),
-                    $backLinkElements
-                );
-
-                unset($textElements[$n]['name']);
-
-                $textElements[$n] = array(
-                    'name' => 'p',
-                    'elements' => array_merge(
-                        array($textElements[$n]),
-                        $backLinkElements
-                    ),
-                );
-            }
-            else
-            {
-                $textElements[] = array(
-                    'name' => 'p',
-                    'elements' => $backLinkElements
-                );
-            }
-
-            $Element['elements'][1]['elements'] []= array(
-                'name' => 'li',
-                'attributes' => array('id' => 'fn:'.$definitionId),
-                'elements' => array_merge(
-                    $textElements
-                ),
-            );
-        }
-
-        return $Element;
-    }
-
-    # ~
-
-    protected function parseAttributeData($attributeString)
-    {
-        $Data = array();
-
-        $attributes = preg_split('/[ ]+/', $attributeString, - 1, PREG_SPLIT_NO_EMPTY);
-
-        foreach ($attributes as $attribute)
-        {
-            if ($attribute[0] === '#')
-            {
-                $Data['id'] = substr($attribute, 1);
-            }
-            else # "."
-            {
-                $classes []= substr($attribute, 1);
-            }
-        }
-
-        if (isset($classes))
-        {
-            $Data['class'] = implode(' ', $classes);
-        }
-
-        return $Data;
-    }
-
-    # ~
-
-    protected function processTag($elementMarkup) # recursive
-    {
-        # http://stackoverflow.com/q/1148928/200145
-        libxml_use_internal_errors(true);
-
-        $DOMDocument = new DOMDocument;
-
-        # http://stackoverflow.com/q/11309194/200145
-        $elementMarkup = mb_convert_encoding($elementMarkup, 'HTML-ENTITIES', 'UTF-8');
-
-        # http://stackoverflow.com/q/4879946/200145
-        $DOMDocument->loadHTML($elementMarkup);
-        $DOMDocument->removeChild($DOMDocument->doctype);
-        $DOMDocument->replaceChild($DOMDocument->firstChild->firstChild->firstChild, $DOMDocument->firstChild);
-
-        $elementText = '';
-
-        if ($DOMDocument->documentElement->getAttribute('markdown') === '1')
-        {
-            foreach ($DOMDocument->documentElement->childNodes as $Node)
-            {
-                $elementText .= $DOMDocument->saveHTML($Node);
-            }
-
-            $DOMDocument->documentElement->removeAttribute('markdown');
-
-            $elementText = "\n".$this->text($elementText)."\n";
-        }
-        else
-        {
-            foreach ($DOMDocument->documentElement->childNodes as $Node)
-            {
-                $nodeMarkup = $DOMDocument->saveHTML($Node);
-
-                if ($Node instanceof DOMElement and ! in_array($Node->nodeName, $this->textLevelElements))
-                {
-                    $elementText .= $this->processTag($nodeMarkup);
-                }
-                else
-                {
-                    $elementText .= $nodeMarkup;
-                }
-            }
-        }
-
-        # because we don't want for markup to get encoded
-        $DOMDocument->documentElement->nodeValue = 'placeholder\x1A';
-
-        $markup = $DOMDocument->saveHTML($DOMDocument->documentElement);
-        $markup = str_replace('placeholder\x1A', $elementText, $markup);
-
-        return $markup;
-    }
-
-    # ~
-
-    protected function sortFootnotes($A, $B) # callback
-    {
-        return $A['number'] - $B['number'];
-    }
-
-    #
-    # Fields
-    #
-
-    protected $regexAttribute = '(?:[#.][-\w]+[ ]*)';
-}
diff --git a/lib/parsedownextraplugin/parsedownextraplugin.class.php b/lib/parsedownextraplugin/parsedownextraplugin.class.php
deleted file mode 100644
index f4787db640..0000000000
--- a/lib/parsedownextraplugin/parsedownextraplugin.class.php
+++ /dev/null
@@ -1,590 +0,0 @@
-<?php
-#
-#
-# Parsedown Extra Plugin
-# https://github.com/taufik-nurrohman/parsedown-extra-plugin
-#
-# (c) Emanuil Rusev
-# http://erusev.com
-#
-# (c) Taufik Nurrohman
-# https://mecha-cms.com
-#
-# For the full license information, view the LICENSE file that was distributed
-# with this source code.
-#
-#
-
-require 'parsedown.php';
-require 'parsedownextra.php';
-
-class parsedownextraplugin extends parsedownextra {
-
-    const version = '1.3.6';
-
-    public $abbreviationData = array();
-
-    public $blockCodeAttributes = array();
-
-    public $blockCodeClassFormat = 'language-%s';
-
-    public $blockCodeHtml = null;
-
-    public $blockQuoteAttributes = array();
-
-    public $blockQuoteText = null;
-
-    public $codeAttributes = array();
-
-    public $codeAttributesOnParent = false;
-
-    public $codeHtml = null;
-
-    public $figureAttributes = array();
-
-    public $figuresEnabled = false;
-
-    public $footnoteAttributes = array();
-
-    public $footnoteBackLinkAttributes = array();
-
-    public $footnoteBackLinkHtml = null;
-
-    public $footnoteBackReferenceAttributes = array();
-
-    public $footnoteLinkAttributes = array();
-
-    public $footnoteLinkHtml = null;
-
-    public $footnoteReferenceAttributes = array();
-
-    public $headerAttributes = array();
-
-    public $headerText = null;
-
-    public $imageAttributes = array();
-
-    public $imageAttributesOnParent = false;
-
-    public $linkAttributes = array();
-
-    public $referenceData = array();
-
-    public $tableAttributes = array();
-
-    public $tableColumnAttributes = array();
-
-    public $voidElementSuffix = ' />';
-
-    protected $regexAttribute = '(?:[#.][-\w:\\\]+[ ]*|[-\w:\\\]+(?:=(?:["\'][^\n]*?["\']|[^\s]+)?)?[ ]*)';
-
-    # Method aliases for every configuration property
-    public function __call($key, array $arguments = array()) {
-        $property = lcfirst(substr($key, 3));
-        if (strpos($key, 'set') === 0 && property_exists($this, $property)) {
-            $this->{$property} = $arguments[0];
-            return $this;
-        }
-        throw new Exception('Method ' . $key . ' does not exists.');
-    }
-
-    public function __construct() {
-        if (version_compare(parent::version, '0.8.0-beta-1') < 0) {
-            throw new Exception('ParsedownExtraPlugin requires a later version of Parsedown');
-        }
-        $this->BlockTypes['!'][] = 'Image';
-        parent::__construct();
-    }
-
-    protected function blockAbbreviation($Line) {
-        // Allow empty abbreviations
-        if (preg_match('/^\*\[(.+?)\]:[ ]*$/', $Line['text'], $matches)) {
-            $this->DefinitionData['Abbreviation'][$matches[1]] = null;
-            return array('hidden' => true);
-        }
-        return parent::blockAbbreviation($Line);
-    }
-
-    protected function blockCodeComplete($Block) {
-        $this->doSetAttributes($Block['element']['element'], $this->blockCodeAttributes);
-        $this->doSetContent($Block['element']['element'], $this->blockCodeHtml, true);
-        // Put code attributes on parent element
-        if ($this->codeAttributesOnParent) {
-            if ($this->codeAttributesOnParent === true) {
-                // $this->codeAttributesOnParent = array_keys($Block['element']['element']['attributes']);
-                $this->codeAttributesOnParent = array('class', 'id');
-            }
-            foreach ((array) $this->codeAttributesOnParent as $Name) {
-                if (isset($Block['element']['element']['attributes'][$Name])) {
-                    $Block['element']['attributes'][$Name] = $Block['element']['element']['attributes'][$Name];
-                    unset($Block['element']['element']['attributes'][$Name]);
-                }
-            }
-        }
-        $Block['element']['element']['rawHtml'] = $Block['element']['element']['text'];
-        $Block['element']['element']['allowRawHtmlInSafeMode'] = true;
-        unset($Block['element']['element']['text']);
-        return $Block;
-    }
-
-    protected function blockFencedCode($Line) {
-        // Re-enable the multiple class name feature
-        $Line['text'] = strtr(trim($Line['text']), array(
-            ' ' => "\x1A",
-            '.' => "\x1A."
-        ));
-        // Enable custom attribute syntax on code block
-        $Attributes = array();
-        if (strpos($Line['text'], '{') !== false && substr($Line['text'], -1) === '}') {
-            $Parts = explode('{', $Line['text'], 2);
-            $Attributes = $this->parseAttributeData(strtr(substr($Parts[1], 0, -1), "\x1A", ' '));
-            $Line['text'] = trim($Parts[0]);
-        }
-        if (!$Block = parent::blockFencedCode($Line)) {
-            return;
-        }
-        if ($Attributes) {
-            $Block['element']['element']['attributes'] = $Attributes;
-        } else if (isset($Block['element']['element']['attributes']['class'])) {
-            $Classes = explode("\x1A", strtr($Block['element']['element']['attributes']['class'], ' ', "\x1A"));
-            // `~~~ php` → `<pre><code class="language-php">`
-            // `~~~ php html` → `<pre><code class="language-php language-html">`
-            // `~~~ .php` → `<pre><code class="php">`
-            // `~~~ .php.html` → `<pre><code class="php html">`
-            // `~~~ .php html` → `<pre><code class="php language-html">`
-            // `~~~ {.php #foo}` → `<pre><code id="foo" class="php">`
-            $Results = [];
-            foreach ($Classes as $Class) {
-                if ($Class === "" || $Class === strtr($this->blockCodeClassFormat, array('%s' => ""))) {
-                    continue;
-                }
-                if ($Class[0] === '.') {
-                    $Results[] = substr($Class, 1);
-                } else if (preg_match('/^' . strtr(preg_quote($this->blockCodeClassFormat), array('%s' => '\S+')) . '$/', $Class)) {
-                    $Results[] = $Class; // Do nothing!
-                } else {
-                    $Results[] = sprintf($this->blockCodeClassFormat, $Class);
-                }
-            }
-            if ($Results = array_unique($Results)) {
-                $Block['element']['element']['attributes']['class'] = implode(' ', $Results);
-            } else {
-                unset($Block['element']['element']['attributes']['class']);
-            }
-        }
-        return $Block;
-    }
-
-    protected function blockFencedCodeComplete($Block) {
-        return $this->blockCodeComplete($Block);
-    }
-
-    protected function blockHeader($Line) {
-        if (!$Block = parent::blockHeader($Line)) {
-            return;
-        }
-        $Level = strspn($Line['text'], '#');
-        $this->doSetAttributes($Block['element'], $this->headerAttributes, array($Level));
-        $this->doSetContent($Block['element'], $this->headerText, false, 'argument', array($Level));
-        return $Block;
-    }
-
-    protected function blockImage($Line) {
-        if (!$this->figuresEnabled) {
-            return;
-        }
-        // Match exactly an image syntax in a paragraph (with optional custom attributes, and optional hard break marker)
-        if (preg_match('/^\!\[[^\n]*?\](\[[^\n]*?\]|\([^\n]*?\))(\s*\{' . $this->regexAttribute . '+?\})?([ ]{2})?$/', $Line['text'])) {
-            $Block = array(
-                'description' => "",
-                'element' => array(
-                    'name' => 'figure',
-                    'attributes' => array(),
-                    'elements' => array(
-                        $this->inlineImage($Line)
-                    )
-                )
-            );
-            $this->doSetAttributes($Block['element'], $this->figureAttributes);
-            return $Block;
-        }
-        return;
-    }
-
-    protected function blockImageComplete($Block) {
-        if (!empty($Block['description'])) {
-            $Description = $Block['description'];
-            $Block['element']['elements'][] = array(
-                'name' => 'figcaption',
-                'rawHtml' => $this->{strpos($Description, "\n\n") === false ? 'line' : 'text'}(trim($Description, "\n"))
-            );
-            // unset($Block['description']);
-        }
-        if ($this->imageAttributesOnParent) {
-            $Inline = $Block['element']['elements'][0];
-            if ($this->imageAttributesOnParent === true) {
-                $this->imageAttributesOnParent = array_keys($Inline['element']['attributes']);
-            }
-            foreach ((array) $this->imageAttributesOnParent as $Name) {
-                if (isset($Inline['element']['attributes'][$Name])) {
-                    // Merge class names
-                    if (
-                        $Name === 'class' &&
-                        isset($Block['element']['attributes'][$Name]) &&
-                        isset($Inline['element']['attributes'][$Name])
-                    ) {
-                        $Classes = array_merge(
-                            explode(' ', $Block['element']['attributes'][$Name]),
-                            explode(' ', $Inline['element']['attributes'][$Name])
-                        );
-                        sort($Classes);
-                        $Block['element']['attributes']['class'] = implode(' ', array_unique(array_filter($Classes)));
-                        unset($Block['element']['elements'][0]['element']['attributes'][$Name]);
-                        continue;
-                    }
-                    $Block['element']['attributes'][$Name] = $Inline['element']['attributes'][$Name];
-                    unset($Block['element']['elements'][0]['element']['attributes'][$Name]);
-                }
-            }
-        }
-        return $Block;
-    }
-
-    protected function blockImageContinue($Line, array $Block) {
-        if (isset($Block['complete'])) {
-            return;
-        }
-        if (isset($Block['interrupted'])) {
-            $Block['description'] .= "\n";
-            unset($Block['interrupted']);
-        }
-        if ($Line['indent'] === 0) {
-            $Block['complete'] = true;
-            return;
-        }
-        if ($Line['indent'] > 0 && $Line['indent'] < 4) {
-            $Block['description'] .= "\n" . $Line['text'];
-            return $Block;
-        }
-        return;
-    }
-
-    protected function blockQuoteComplete($Block) {
-        $this->doSetAttributes($Block['element'], $this->blockQuoteAttributes);
-        $this->doSetContent($Block['element'], $this->blockQuoteText, false, 'arguments');
-        return $Block;
-    }
-
-    protected function blockSetextHeader($Line, array $Block = null) {
-        if (!$Block = parent::blockSetextHeader($Line, $Block)) {
-            return;
-        }
-        $Level = $Line['text'][0] === '=' ? 1 : 2;
-        $this->doSetAttributes($Block['element'], $this->headerAttributes, array($Level));
-        $this->doSetContent($Block['element'], $this->headerText, false, 'argument', array($Level));
-        return $Block;
-    }
-
-    protected function blockTableContinue($Line, array $Block) {
-        if (!$Block = parent::blockTableContinue($Line, $Block)) {
-            return;
-        }
-        $Aligns = $Block['alignments'];
-        // `<thead>` or `<tbody>`
-        foreach ($Block['element']['elements'] as $Index0 => &$Element0) {
-            // `<tr>`
-            foreach ($Element0['elements'] as $Index1 => &$Element1) {
-                // `<th>` or `<td>`
-                foreach ($Element1['elements'] as $Index2 => &$Element2) {
-                    $this->doSetAttributes($Element2, $this->tableColumnAttributes, array($Aligns[$Index2], $Index2, $Index1));
-                }
-            }
-        }
-        return $Block;
-    }
-
-    protected function blockTableComplete($Block) {
-        $this->doSetAttributes($Block['element'], $this->tableAttributes);
-        return $Block;
-    }
-
-    protected function buildFootnoteElement() {
-        $DefinitionData = $this->DefinitionData['Footnote'];
-        if (!$Footnotes = parent::buildFootnoteElement()) {
-            return;
-        }
-        $DefinitionKey = array_keys($DefinitionData);
-        $DefinitionData = array_values($DefinitionData);
-        $this->doSetAttributes($Footnotes, $this->footnoteAttributes);
-        foreach ($Footnotes['elements'][1]['elements'] as $Index0 => &$Element0) {
-            $Name = $DefinitionKey[$Index0];
-            $Count = $DefinitionData[$Index0]['count'];
-            $Args = array(is_numeric($Name) ? (float) $Name : $Name, $Count);
-            $this->doSetAttributes($Element0, $this->footnoteBackReferenceAttributes, $Args);
-            foreach ($Element0['elements'] as $Index1 => &$Element1) {
-                if (!isset($Element1['elements'])) {
-                    continue;
-                }
-                $Count = 0;
-                foreach ($Element1['elements'] as $Index2 => &$Element2) {
-                    if (!isset($Element2['name']) || $Element2['name'] !== 'a') {
-                        continue;
-                    }
-                    $Args[1] = ++$Count;
-                    $this->doSetAttributes($Element2, $this->footnoteBackLinkAttributes, $Args);
-                    $this->doSetContent($Element2, $this->footnoteBackLinkHtml, false, 'rawHtml');
-                }
-            }
-        }
-        return $Footnotes;
-    }
-
-    protected function doGetAttributes($Element) {
-        if (isset($Element['attributes'])) {
-            return (array) $Element['attributes'];
-        }
-        return array();
-    }
-
-    protected function doGetContent($Element) {
-        if (isset($Element['text'])) {
-            return $Element['text'];
-        }
-        if (isset($Element['rawHtml'])) {
-            return $Element['rawHtml'];
-        }
-        if (isset($Element['handler']['argument'])) {
-            return implode("\n", (array) $Element['handler']['argument']);
-        }
-        return null;
-    }
-
-    private function doSetLink($Excerpt, $Function) {
-        if (!$Inline = call_user_func('parent::' . $Function, $Excerpt)) {
-            return;
-        }
-        $this->doSetAttributes($Inline['element'], $this->linkAttributes, array($this->isLocal($Inline['element'], 'href')));
-        $this->doSetData($this->DefinitionData['Reference'], $this->referenceData);
-        return $Inline;
-    }
-
-    protected function doSetAttributes(&$Element, $From, $Args = array()) {
-        $Attributes = $this->doGetAttributes($Element);
-        $Content = $this->doGetContent($Element);
-        if (is_callable($From)) {
-            $Args = array_merge(array($Content, $Attributes, &$Element), $Args);
-            $Element['attributes'] = array_replace($Attributes, (array) call_user_func_array($From, $Args));
-        } else {
-            $Element['attributes'] = array_replace($Attributes, (array) $From);
-        }
-    }
-
-    protected function doSetContent(&$Element, $From, $Esc = false, $Mode = 'text', $Args = array()) {
-        $Attributes = $this->doGetAttributes($Element);
-        $Content = $this->doGetContent($Element);
-        if ($Esc) {
-            $Content = parent::escape($Content, true);
-        }
-        if (is_callable($From)) {
-            $Args = array_merge(array($Content, $Attributes, &$Element), $Args);
-            $Content = call_user_func_array($From, $Args);
-        } else if (!empty($From)) {
-            $Content = sprintf($From, $Content);
-        }
-        if ($Mode === 'arguments') {
-            $Element['handler']['argument'] = explode("\n", $Content);
-        } else if ($Mode === 'argument') {
-            $Element['handler']['argument'] = $Content;
-        } else {
-            $Element[$Mode] = $Content;
-        }
-    }
-
-    protected function doSetData(&$To, $From) {
-        $To = array_replace((array) $To, (array) $From);
-    }
-
-    protected function element(array $Element) {
-        if (!$Any = parent::element($Element)) {
-            return;
-        }
-        if (substr($Any, -3) === ' />') {
-            if (is_callable($this->voidElementSuffix)) {
-                $Attributes = $this->doGetAttributes($Element);
-                $Content = $this->doGetContent($Element);
-                $Suffix = call_user_func_array($this->voidElementSuffix, [$Content, $Attributes, &$Element]);
-            } else {
-                $Suffix = $this->voidElementSuffix;
-            }
-            $Any = substr_replace($Any, $Suffix, -3);
-        }
-        return $Any;
-    }
-
-    protected function inlineCode($Excerpt) {
-        if (!$Inline = parent::inlineCode($Excerpt)) {
-            return;
-        }
-        $this->doSetAttributes($Inline['element'], $this->codeAttributes);
-        $this->doSetContent($Inline['element'], $this->codeHtml, true);
-        $Inline['element']['rawHtml'] = $Inline['element']['text'];
-        $Inline['element']['allowRawHtmlInSafeMode'] = true;
-        unset($Inline['element']['text']);
-        return $Inline;
-    }
-
-    protected function inlineFootnoteMarker($Excerpt) {
-        if (!$Inline = parent::inlineFootnoteMarker($Excerpt)) {
-            return;
-        }
-        $Name = null;
-        if (preg_match('/^\[\^(.+?)\]/', $Excerpt['text'], $matches)) {
-            $Name = $matches[1];
-        }
-        $Args = array(is_numeric($Name) ? (float) $Name : $Name, $this->DefinitionData['Footnote'][$Name]['count']);
-        $this->doSetAttributes($Inline['element'], $this->footnoteReferenceAttributes, $Args);
-        $this->doSetAttributes($Inline['element']['element'], $this->footnoteLinkAttributes, $Args);
-        $this->doSetContent($Inline['element']['element'], $this->footnoteLinkHtml, false, 'text', $Args);
-        $Inline['element']['element']['rawHtml'] = $Inline['element']['element']['text'];
-        $Inline['element']['element']['allowRawHtmlInSafeMode'] = true;
-        unset($Inline['element']['element']['text']);
-        return $Inline;
-    }
-
-    protected function inlineImage($Excerpt) {
-        if (!$Inline = parent::inlineImage($Excerpt)) {
-            return;
-        }
-        $this->doSetAttributes($Inline['element'], $this->imageAttributes, array($this->isLocal($Inline['element'], 'src')));
-        return $Inline;
-    }
-
-    protected function inlineLink($Excerpt) {
-        return $this->doSetLink($Excerpt, __FUNCTION__);
-    }
-
-    protected function inlineText($Text) {
-        $this->doSetData($this->DefinitionData['Abbreviation'], $this->abbreviationData);
-        return parent::inlineText($Text);
-    }
-
-    protected function inlineUrl($Excerpt) {
-        return $this->doSetLink($Excerpt, __FUNCTION__);
-    }
-
-    protected function inlineUrlTag($Excerpt) {
-        return $this->doSetLink($Excerpt, __FUNCTION__);
-    }
-
-    protected function isLocal($Element, $Key) {
-        $Link = isset($Element['attributes'][$Key]) ? (string) $Element['attributes'][$Key] : null;
-        if (
-            // `<a href="">`
-            $Link === "" ||
-            // `<a href="../foo/bar">`
-            // `<a href="/foo/bar">`
-            // `<a href="?foo=bar">`
-            // `<a href="&foo=bar">`
-            // `<a href="#foo">`
-            strpos('./?&#', $Link[0]) !== false && strpos($Link, '//') !== 0 ||
-            // `<a href="data:text/html,asdf">`
-            strpos($Link, 'data:') === 0 ||
-            // `<a href="javascript:;">`
-            strpos($Link, 'javascript:') === 0 ||
-            // `<a href="mailto:as@df">`
-            strpos($Link, 'mailto:') === 0
-        ) {
-            return true;
-        }
-        if (isset($_SERVER['HTTP_HOST'])) {
-            $Host = $_SERVER['HTTP_HOST'];
-        } else if (isset($_SERVER['SERVER_NAME'])) {
-            $Host = $_SERVER['SERVER_NAME'];
-        } else {
-            $Host = "";
-        }
-        // `<a href="//example.com">`
-        if (strpos($Link, '//') === 0 && strpos($Link, '//' . $Host) !== 0) {
-            return false;
-        }
-        if (
-            // `<a href="https://127.0.0.1">`
-            strpos($Link, 'https://' . $Host) === 0 ||
-            // `<a href="http://127.0.0.1">`
-            strpos($Link, 'http://' . $Host) === 0
-        ) {
-            return true;
-        }
-        // `<a href="foo/bar">`
-        return strpos($Link, '://') === false;
-    }
-
-    protected function parseAttributeData($attributeString) {
-        // Allow compact attributes
-        $attributeString = strtr($attributeString, array(
-            '#' => ' #',
-            '.' => ' .'
-        ));
-        if (strpos($attributeString, '="') !== false || strpos($attributeString, "='") !== false) {
-            $attributeString = preg_replace_callback('#([-\w]+=)(["\'])([^\n]*?)\2#', function($matches) {
-                $value = strtr($matches[3], array(
-                    ' #' => '#',
-                    ' .' => '.',
-                    ' ' => "\x1A"
-                ));
-                return $matches[1] . $matches[2] . $value . $matches[2];
-            }, $attributeString);
-        }
-        $Attributes = array();
-        foreach (explode(' ', $attributeString) as $v) {
-            if (!$v) {
-                continue;
-            }
-            // `{#foo}`
-            if ($v[0] === '#' && isset($v[1])) {
-                $Attributes['id'] = substr($v, 1);
-            // `{.foo}`
-            } else if ($v[0] === '.' && isset($v[1])) {
-                $Attributes['class'][] = substr($v, 1);
-            // ~
-            } else if (strpos($v, '=') !== false) {
-                $vv = explode('=', $v, 2);
-                // `{foo=}`
-                if ($vv[1] === "") {
-                    if ($vv[0] === 'class') {
-                        continue;
-                    }
-                    $Attributes[$vv[0]] = "";
-                // `{foo="bar baz"}`
-                // `{foo='bar baz'}`
-                } else if ($vv[1][0] === '"' && substr($vv[1], -1) === '"' || $vv[1][0] === "'" && substr($vv[1], -1) === "'") {
-                    $values = stripslashes(strtr(substr(substr($vv[1], 1), 0, -1), "\x1A", ' '));
-                    if ($vv[0] === 'class' && isset($Attributes[$vv[0]])) {
-                        $values = explode(' ', $values);
-                        $Attributes[$vv[0]] = array_merge($Attributes[$vv[0]], $values);
-                    } else {
-                        $Attributes[$vv[0]] = $values;
-                    }
-                // `{foo=bar}`
-                } else {
-                    if ($vv[0] === 'class' && isset($Attributes[$vv[0]])) {
-                        $Attributes[$vv[0]] = array_merge($Attributes[$vv[0]], [$vv[1]]);
-                    } else {
-                        $Attributes[$vv[0]] = $vv[1];
-                    }
-                }
-            // `{foo}`
-            } else {
-                if ($v === 'class' && isset($Attributes[$v])) {
-                    continue;
-                }
-                $Attributes[$v] = $v;
-            }
-        }
-        if (isset($Attributes['class'])) {
-            $Attributes['class'] = implode(' ', array_unique((array) $Attributes['class']));
-        }
-        return $Attributes;
-    }
-
-}
diff --git a/module/common/model.php b/module/common/model.php
index a923835821..b3ef19aac3 100644
--- a/module/common/model.php
+++ b/module/common/model.php
@@ -3250,13 +3250,11 @@ EOD;
         if(empty($markdown)) return false;
 
         global $app;
-        $app->loadClass('parsedownextraplugin');
+        $app->loadClass('michelf');
 
-        $Parsedown = new parsedownextraplugin;
+        $Michelf = new michelf;
 
-        $Parsedown->voidElementSuffix = '>'; // HTML5
-
-        return $Parsedown->text($markdown);
+        return $Michelf->parse($markdown);
     }
 }