:arrow_up: Update libraries.

michelf/php-markdown (1.7.0 => 1.8.0)
ezyang/htmlpurifier (v4.9.3 => v4.10.0)
commerceguys/intl (v0.7.4 => v0.7.5)
sabre/http (4.2.3 => v4.2.4)
sabre/vobject (4.1.3 => 4.1.5)

3 files changed, 262 insertions, 239 deletions

diff --git a/vendor/michelf/php-markdown/Michelf/Markdown.php b/vendor/michelf/php-markdown/Michelf/Markdown.php
index c3eaf4464..e4c2c2361 100644
--- a/vendor/michelf/php-markdown/Michelf/Markdown.php
+++ b/vendor/michelf/php-markdown/Michelf/Markdown.php
@@ -4,7 +4,7 @@
  *
  * @package   php-markdown
  * @author    Michel Fortin <michel.fortin@michelf.com>
- * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright 2004-2018 Michel Fortin <https://michelf.com/projects/php-markdown/>
  * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
  */
 
@@ -18,7 +18,7 @@ class Markdown implements MarkdownInterface {
 	 * Define the package version
 	 * @var string
 	 */
-	const MARKDOWNLIB_VERSION = "1.7.0";
+	const MARKDOWNLIB_VERSION = "1.8.0";
 
 	/**
 	 * Simple function interface - Initialize the parser and return the result
@@ -61,14 +61,14 @@ class Markdown implements MarkdownInterface {
 	 * @var int
 	 */
 	public $tab_width = 4;
-	
+
 	/**
 	 * Change to `true` to disallow markup or entities.
 	 * @var boolean
 	 */
 	public $no_markup   = false;
 	public $no_entities = false;
-	
+
 
 	/**
 	 * Change to `true` to enable line breaks on \n without two trailling spaces
@@ -94,7 +94,7 @@ class Markdown implements MarkdownInterface {
 	 * @var callable
 	 */
 	public $header_id_func = null;
-	
+
 	/**
 	 * Optional function for converting code block content to HTML
 	 * @var callable
@@ -111,7 +111,7 @@ class Markdown implements MarkdownInterface {
 	 * 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
@@ -155,17 +155,17 @@ class Markdown implements MarkdownInterface {
 	public function __construct() {
 		$this->_initDetab();
 		$this->prepareItalicsAndBold();
-	
-		$this->nested_brackets_re = 
+
+		$this->nested_brackets_re =
 			str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
 			str_repeat('\])*', $this->nested_brackets_depth);
-	
-		$this->nested_url_parenthesis_re = 
+
+		$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);
@@ -180,13 +180,19 @@ class Markdown implements MarkdownInterface {
 	protected $urls        = array();
 	protected $titles      = array();
 	protected $html_hashes = array();
-	
+
 	/**
 	 * Status flag to avoid invalid nesting.
 	 * @var boolean
 	 */
 	protected $in_anchor = false;
-	
+
+	/**
+	 * Status flag to avoid invalid nesting.
+	 * @var boolean
+	 */
+	protected $in_emphasis_processing = false;
+
 	/**
 	 * Called before the transformation process starts to setup parser states.
 	 * @return void
@@ -197,8 +203,9 @@ class Markdown implements MarkdownInterface {
 		$this->titles      = $this->predef_titles;
 		$this->html_hashes = array();
 		$this->in_anchor   = false;
+		$this->in_emphasis_processing = false;
 	}
-	
+
 	/**
 	 * Called after the transformation process to clear any variable which may
 	 * be taking up memory unnecessarly.
@@ -221,7 +228,7 @@ class Markdown implements MarkdownInterface {
 	 */
 	public function transform($text) {
 		$this->setup();
-	
+
 		# Remove UTF-8 BOM and marker character in input, if present.
 		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
 
@@ -248,7 +255,7 @@ class Markdown implements MarkdownInterface {
 		foreach ($this->document_gamut as $method => $priority) {
 			$text = $this->$method($text);
 		}
-		
+
 		$this->teardown();
 
 		return $text . "\n";
@@ -271,7 +278,7 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function stripLinkDefinitions($text) {
-	
+
 		$less_than_tab = $this->tab_width - 1;
 
 		// Link defs are in the form: ^[id]: url "optional title"
@@ -338,8 +345,8 @@ class Markdown implements MarkdownInterface {
 		 * 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 
+		 *    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;
 		 */
@@ -363,7 +370,7 @@ class Markdown implements MarkdownInterface {
 			  |
 				\'[^\']*\'	# text inside single quotes (tolerate ">")
 			  )*
-			)?	
+			)?
 			';
 		$content =
 			str_repeat('
@@ -380,7 +387,7 @@ class Markdown implements MarkdownInterface {
 			str_repeat('
 					  </\2\s*>	# closing nested tag
 					)
-				  |				
+				  |
 					<(?!/\2\s*>	# other tags with a different name
 				  )
 				)*',
@@ -409,9 +416,9 @@ class Markdown implements MarkdownInterface {
 			)
 			(						# save in $1
 
-			  # Match from `\n<tag>` to `</tag>\n`, handling nested tags 
+			  # 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
@@ -429,28 +436,28 @@ class Markdown implements MarkdownInterface {
 						</\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 
+
+			| # 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:
 						<([?%])			# $2
@@ -459,7 +466,7 @@ class Markdown implements MarkdownInterface {
 					)
 					[ ]*
 					(?=\n{2,}|\Z)		# followed by a blank line or end of document
-					
+
 			)
 			)}Sxmi',
 			array($this, '_hashHTMLBlocks_callback'),
@@ -479,9 +486,9 @@ class Markdown implements MarkdownInterface {
 		$key  = $this->hashBlock($text);
 		return "\n\n$key\n\n";
 	}
-	
+
 	/**
-	 * Called whenever a tag must be hashed when a function insert an atomic 
+	 * 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.
 	 *
@@ -498,7 +505,7 @@ class Markdown implements MarkdownInterface {
 		// 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;
@@ -531,10 +538,10 @@ class Markdown implements MarkdownInterface {
 	/**
 	 * 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 
+	 * 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 
+	 * 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
@@ -546,7 +553,7 @@ class Markdown implements MarkdownInterface {
 	}
 
 	/**
-	 * Run block gamut tranformations, without hashing HTML blocks. This is 
+	 * 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.
 	 *
@@ -554,11 +561,11 @@ class Markdown implements MarkdownInterface {
 	 * @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);
 
@@ -582,7 +589,7 @@ class Markdown implements MarkdownInterface {
 				[ ]*		# Tailing spaces
 				$			# End of line.
 			}mx',
-			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n", 
+			"\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n",
 			$text
 		);
 	}
@@ -629,10 +636,10 @@ class Markdown implements MarkdownInterface {
 	 */
 	protected function doHardBreaks($text) {
 		if ($this->hard_wrap) {
-			return preg_replace_callback('/ *\n/', 
+			return preg_replace_callback('/ *\n/',
 				array($this, '_doHardBreaks_callback'), $text);
 		} else {
-			return preg_replace_callback('/ {2,}\n/', 
+			return preg_replace_callback('/ {2,}\n/',
 				array($this, '_doHardBreaks_callback'), $text);
 		}
 	}
@@ -656,7 +663,7 @@ class Markdown implements MarkdownInterface {
 			return $text;
 		}
 		$this->in_anchor = true;
-		
+
 		// First, handle reference-style links: [link text] [id]
 		$text = preg_replace_callback('{
 			(					# wrap whole match in $1
@@ -729,7 +736,7 @@ class Markdown implements MarkdownInterface {
 			// 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}', ' ', $link_id);
@@ -737,14 +744,14 @@ class Markdown implements MarkdownInterface {
 		if (isset($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);
@@ -779,7 +786,7 @@ class Markdown implements MarkdownInterface {
 			$title = $this->encodeAttribute($title);
 			$result .=  " title=\"$title\"";
 		}
-		
+
 		$link_text = $this->runSpanGamut($link_text);
 		$result .= ">$link_text</a>";
 
@@ -807,7 +814,7 @@ class Markdown implements MarkdownInterface {
 			  \]
 
 			)
-			}xs', 
+			}xs',
 			array($this, '_doImages_reference_callback'), $text);
 
 		// Next, handle inline images:  ![alt text](url "optional title")
@@ -906,7 +913,7 @@ class Markdown implements MarkdownInterface {
 		 * Setext-style headers:
 		 *	  Header 1
 		 *	  ========
-		 *  
+		 *
 		 *	  Header 2
 		 *	  --------
 		 */
@@ -944,7 +951,7 @@ class Markdown implements MarkdownInterface {
 		if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1])) {
 			return $matches[0];
 		}
-		
+
 		$level = $matches[2]{0} == '=' ? 1 : 2;
 
 		// ID attribute generation
@@ -977,7 +984,7 @@ class Markdown implements MarkdownInterface {
 	 * @param  string $headerValue
 	 * @return string
 	 */
-	protected function _generateIdFromHeaderValue($headerValue) {		
+	protected function _generateIdFromHeaderValue($headerValue) {
 		if (!is_callable($this->header_id_func)) {
 			return "";
 		}
@@ -1035,10 +1042,10 @@ class Markdown implements MarkdownInterface {
 				  )
 				)
 			'; // 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('{
 						^
@@ -1132,7 +1139,7 @@ class Markdown implements MarkdownInterface {
 		 * 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:
@@ -1166,7 +1173,7 @@ class Markdown implements MarkdownInterface {
 		$marker_space = $matches[3];
 		$tailing_blank_line =& $matches[5];
 
-		if ($leading_line || $tailing_blank_line || 
+		if ($leading_line || $tailing_blank_line ||
 			preg_match('/\n{2,}/', $item))
 		{
 			// Replace marker with the appropriate whitespace indentation
@@ -1273,7 +1280,7 @@ class Markdown implements MarkdownInterface {
 	 * @var array
 	 */
 	protected $em_strong_prepared_relist;
-	
+
 	/**
 	 * Prepare regular expressions for searching emphasis tokens in any
 	 * context.
@@ -1289,7 +1296,7 @@ class Markdown implements MarkdownInterface {
 				}
 				$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"] = $token_re;
@@ -1303,24 +1310,29 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function doItalicsAndBold($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 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.
@@ -1330,7 +1342,7 @@ class Markdown implements MarkdownInterface {
 				}
 				break;
 			}
-			
+
 			$token_len = strlen($token);
 			if ($tree_char_em) {
 				// Reached closing marker while inside a three-char emphasis.
@@ -1369,7 +1381,7 @@ class Markdown implements MarkdownInterface {
 						$$tag = ''; // $$tag stands for $em or $strong
 					}
 				} else {
-					// Reached opening three-char emphasis marker. Push on token 
+					// Reached opening three-char emphasis marker. Push on token
 					// stack; will be handled by the special condition above.
 					$em = $token{0};
 					$strong = "$em$em";
@@ -1383,6 +1395,7 @@ class Markdown implements MarkdownInterface {
 					if (strlen($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);
@@ -1417,6 +1430,7 @@ class Markdown implements MarkdownInterface {
 				}
 			}
 		}
+		$this->in_emphasis_processing = false;
 		return $text_stack[0];
 	}
 
@@ -1453,9 +1467,9 @@ class Markdown implements MarkdownInterface {
 		$bq = $this->runBlockGamut($bq); // recurse
 
 		$bq = preg_replace('/^/m', "  ", $bq);
-		// These leading spaces cause problem with <pre> content, 
+		// These leading spaces cause problem with <pre> content,
 		// so we need to fix that:
-		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx', 
+		$bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
 			array($this, '_doBlockQuotes_callback2'), $bq);
 
 		return "\n" . $this->hashBlock("<blockquote>\n$bq\n</blockquote>") . "\n\n";
@@ -1525,7 +1539,7 @@ class Markdown implements MarkdownInterface {
 //					// 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);
@@ -1582,9 +1596,9 @@ class Markdown implements MarkdownInterface {
 
 		return $url;
 	}
-	
+
 	/**
-	 * Smart processing for ampersands and angle brackets that need to 
+	 * 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
@@ -1596,7 +1610,7 @@ class Markdown implements MarkdownInterface {
 		} 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+);)/', 
+			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/',
 								'&amp;', $text);
 		}
 		// Encode remaining <'s
@@ -1724,7 +1738,7 @@ class Markdown implements MarkdownInterface {
 	 */
 	protected function parseSpan($str) {
 		$output = '';
-		
+
 		$span_re = '{
 				(
 					\\\\'.$this->escape_chars_re.'
@@ -1752,16 +1766,16 @@ class Markdown implements MarkdownInterface {
 				}xs';
 
 		while (1) {
-			// Each loop iteration seach for either the next tag, the next 
-			// openning code span marker, or the next escaped character. 
+			// 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]);
@@ -1770,7 +1784,7 @@ class Markdown implements MarkdownInterface {
 				break;
 			}
 		}
-		
+
 		return $output;
 	}
 
@@ -1787,7 +1801,7 @@ class Markdown implements MarkdownInterface {
 				return $this->hashPart("&#". ord($token{1}). ";");
 			case "`":
 				// Search for end marker in remaining text.
-				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm', 
+				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm',
 					$str, $matches))
 				{
 					$str = $matches[2];
@@ -1823,11 +1837,11 @@ class Markdown implements MarkdownInterface {
 	 * 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) {	
+	protected function detab($text) {
 		$text = preg_replace_callback('/^.*\t.*$/m',
 			array($this, '_detab_callback'), $text);
 
@@ -1842,7 +1856,7 @@ class Markdown implements MarkdownInterface {
 	protected function _detab_callback($matches) {
 		$line = $matches[0];
 		$strlen = $this->utf8_strlen; // strlen function for UTF-8.
-		
+
 		// Split in blocks.
 		$blocks = explode("\t", $line);
 		// Add each blocks to the line.
@@ -1850,7 +1864,7 @@ class Markdown implements MarkdownInterface {
 		unset($blocks[0]); // Do not add first block twice.
 		foreach ($blocks as $block) {
 			// Calculate amount of space, insert spaces, insert block.
-			$amount = $this->tab_width - 
+			$amount = $this->tab_width -
 				$strlen($line, 'UTF-8') % $this->tab_width;
 			$line .= str_repeat(" ", $amount) . $block;
 		}
@@ -1859,20 +1873,20 @@ class Markdown implements MarkdownInterface {
 
 	/**
 	 * Check for the availability of the function in the `utf8_strlen` property
-	 * (initially `mb_strlen`). If the function is not available, create a 
+	 * (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;
 		}
 
-		$this->utf8_strlen = create_function('$text', 'return preg_match_all(
-			"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/", 
-			$text, $m);');
+		$this->utf8_strlen = function($text) {
+			return preg_match_all('/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/', $text, $m);
+		};
 	}
 
 	/**
@@ -1881,7 +1895,7 @@ class Markdown implements MarkdownInterface {
 	 * @return string
 	 */
 	protected function unhash($text) {
-		return preg_replace_callback('/(.)\x1A[0-9]+\1/', 
+		return preg_replace_callback('/(.)\x1A[0-9]+\1/',
 			array($this, '_unhash_callback'), $text);
 	}
 
diff --git a/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php b/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php
index ac6b1b4f2..a8f7f2c5d 100644
--- a/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php
+++ b/vendor/michelf/php-markdown/Michelf/MarkdownExtra.php
@@ -4,7 +4,7 @@
  *
  * @package   php-markdown
  * @author    Michel Fortin <michel.fortin@michelf.com>
- * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright 2004-2018 Michel Fortin <https://michelf.com/projects/php-markdown/>
  * @copyright (Original Markdown) 2004-2006 John Gruber <https://daringfireball.net/projects/markdown/>
  */
 
@@ -23,14 +23,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @var string
 	 */
 	public $fn_id_prefix = "";
-	
+
 	/**
 	 * Optional title attribute for footnote links and backlinks.
 	 * @var string
 	 */
 	public $fn_link_title     = "";
 	public $fn_backlink_title = "";
-	
+
 	/**
 	 * Optional class attribute for footnote links and backlinks.
 	 * @var string
@@ -74,19 +74,25 @@ class MarkdownExtra extends \Michelf\Markdown {
 	public $predef_abbr = array();
 
 	/**
+	 * Only convert atx-style headers if there's a space between the header and #
+	 * @var boolean
+	 */
+	public $hashtag_protection = false;
+
+	/**
 	 * Parser implementation
 	 */
-	
+
 	/**
 	 * Constructor function. Initialize the parser object.
 	 * @return void
 	 */
 	public function __construct() {
-		// Add extra escapable characters before parent constructor 
+		// Add extra escapable characters before parent constructor
 		// initialize the table.
 		$this->escape_chars .= ':|';
-		
-		// Insert extra document, block, and span transformations. 
+
+		// Insert extra document, block, and span transformations.
 		// Parent constructor will do the sorting.
 		$this->document_gamut += array(
 			"doFencedCodeBlocks" => 5,
@@ -103,12 +109,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 			"doFootnotes"        => 5,
 			"doAbbreviations"    => 70,
 		);
-		
+
 		$this->enhanced_ordered_list = true;
 		parent::__construct();
 	}
-	
-	
+
+
 	/**
 	 * Extra variables used during extra transformations.
 	 * @var array
@@ -118,21 +124,21 @@ class MarkdownExtra extends \Michelf\Markdown {
 	protected $footnotes_ref_count = array();
 	protected $footnotes_numbers = array();
 	protected $abbr_desciptions = array();
-	/** @var @string */
+	/** @var string */
 	protected $abbr_word_re = '';
-	
+
 	/**
 	 * Give the current footnote number.
 	 * @var integer
 	 */
 	protected $footnote_counter = 1;
-	
+
 	/**
 	 * Setting up Extra-specific variables.
 	 */
 	protected function setup() {
 		parent::setup();
-		
+
 		$this->footnotes = array();
 		$this->footnotes_ordered = array();
 		$this->footnotes_ref_count = array();
@@ -140,7 +146,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$this->abbr_desciptions = array();
 		$this->abbr_word_re = '';
 		$this->footnote_counter = 1;
-		
+
 		foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
 			if ($this->abbr_word_re)
 				$this->abbr_word_re .= '|';
@@ -159,11 +165,11 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$this->footnotes_numbers = array();
 		$this->abbr_desciptions = array();
 		$this->abbr_word_re = '';
-		
+
 		parent::teardown();
 	}
-	
-	
+
+
 	/**
 	 * Extra attribute parser
 	 */
@@ -197,7 +203,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function doExtraAttributes($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];
@@ -288,38 +294,38 @@ class MarkdownExtra extends \Michelf\Markdown {
 	/**
 	 * HTML block parser
 	 */
-	
+
 	/**
 	 * Tags that are always treated as block tags
 	 * @var string
 	 */
 	protected $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';
-						   
+
 	/**
 	 * Tags treated as block tags only if the opening tag is alone on its line
 	 * @var string
 	 */
 	protected $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:
 	 * @var string
 	 */
 	protected $contain_span_tags_re = 'p|h[1-6]|li|dd|dt|td|th|legend|address';
-	
+
 	/**
 	 * Tags which must not have their contents modified, no matter where
 	 * they appear
 	 * @var string
 	 */
 	protected $clean_tags_re = 'script|style|math|svg';
-	
+
 	/**
 	 * Tags that do not need to be closed.
 	 * @var string
 	 */
 	protected $auto_close_tags_re = 'hr|img|param|source|track';
-	
+
 	/**
 	 * Hashify HTML Blocks and "clean tags".
 	 *
@@ -330,7 +336,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * hard-coded.
 	 *
 	 * This works by calling _HashHTMLBlocks_InMarkdown, which then calls
-	 * _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1" 
+	 * _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!
@@ -344,15 +350,15 @@ class MarkdownExtra extends \Michelf\Markdown {
 
 		// 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 
+	 * *   $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>
@@ -364,11 +370,11 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 *     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 
+	 * *   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 
+	 * *   If $span is true, text inside must treated as span. So any double
+	 *     newline will be replaced by a single newline so that it does not create
 	 *     paragraphs.
 	 *
 	 * Returns an array of that form: ( processed text , remaining text )
@@ -382,18 +388,18 @@ class MarkdownExtra extends \Michelf\Markdown {
 	protected function _hashHTMLBlocks_inMarkdown($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 = 
+		$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 =
 			'{
@@ -448,7 +454,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 				)
 			}xs';
 
-		
+
 		$depth = 0;		// Current depth inside the tag tree.
 		$parsed = "";	// Parsed text that will be returned.
 
@@ -457,31 +463,31 @@ class MarkdownExtra extends \Michelf\Markdown {
 		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 
+			// pattern will be at the end, and between will be any catches made
 			// by the pattern.
-			$parts = preg_split($block_tag_re, $text, 2, 
+			$parts = preg_split($block_tag_re, $text, 2,
 								PREG_SPLIT_DELIM_CAPTURE);
-			
-			// If in Markdown span mode, add a empty-string span-level hash 
+
+			// If in Markdown span mode, add a empty-string span-level hash
 			// after each newline to prevent triggering any block element.
 			if ($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.
 			$tag_re = preg_quote($tag); // For use in a regular expression.
-			
+
 			// Check for: Fenced code block marker.
 			// Note: need to recheck the whole tag to disambiguate backtick
 			// fences from code spans
@@ -490,7 +496,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$fence_indent = strlen($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)) 
+					$matches))
 				{
 					// End marker found: pass text unchanged until marker.
 					$parsed .= $tag . $matches[0];
@@ -503,7 +509,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			}
 			// Check for: Indented code block.
 			else if ($tag{0} == "\n" || $tag{0} == " ") {
-				// Indented code block: pass it unchanged, will be handled 
+				// Indented code block: pass it unchanged, will be handled
 				// later.
 				$parsed .= $tag;
 			}
@@ -525,7 +531,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 				}
 			}
 			// Check for: Opening Block level tag or
-			//            Opening Context Block tag (like ins and del) 
+			//            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}', $tag) &&
@@ -534,9 +540,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 				)
 			{
 				// Need to parse tag and following text using the HTML parser.
-				list($block_text, $text) = 
+				list($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";
 			}
@@ -547,9 +553,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 			{
 				// Need to parse tag and following text using the HTML parser.
 				// (don't check for markdown attribute)
-				list($block_text, $text) = 
+				list($block_text, $text) =
 					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
-				
+
 				$parsed .= $block_text;
 			}
 			// Check for: Tag with same name as enclosing tag.
@@ -567,14 +573,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 					$text = $tag . $text;
 					break;
 				}
-				
+
 				$parsed .= $tag;
 			}
 			else {
 				$parsed .= $tag;
 			}
 		} while ($depth >= 0);
-		
+
 		return array($parsed, $text);
 	}
 
@@ -594,7 +600,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	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 = '
 			{
@@ -602,15 +608,15 @@ class MarkdownExtra extends \Michelf\Markdown {
 				markdown
 				\s*=\s*
 				(?>
-					(["\'])		# $1: quote delimiter		
+					(["\'])		# $1: quote delimiter
 					(.*?)		# $2: attribute value
-					\1			# matching delimiter	
+					\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.
@@ -633,9 +639,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 					<!\[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.
@@ -649,22 +655,22 @@ class MarkdownExtra extends \Michelf\Markdown {
 		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 
+			// 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 $text reached with unbalenced tag(s).
 				// In that case, we return original text unchanged and pass the
-				// first character as filtered to prevent an infinite loop in the 
+				// first character as filtered to prevent an infinite loop in the
 				// parent function.
 				return array($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}', $tag) ||
@@ -680,20 +686,20 @@ class MarkdownExtra extends \Michelf\Markdown {
 					if ($tag{1} == '/')						$depth--;
 					else if ($tag{strlen($tag)-2} != '/')	$depth++;
 				}
-				
+
 				// Check for `markdown="1"` attribute and handle it.
-				if ($md_attr && 
+				if ($md_attr &&
 					preg_match($markdown_attr_re, $tag, $attr_m) &&
 					preg_match('/^1|block|span$/', $attr_m[2] . $attr_m[3]))
 				{
 					// Remove `markdown` attribute from opening tag.
 					$tag = preg_replace($markdown_attr_re, '', $tag);
-					
+
 					// Check if text inside this tag must be parsed in span mode.
 					$this->mode = $attr_m[2] . $attr_m[3];
 					$span_mode = $this->mode == 'span' || $this->mode != 'block' &&
 						preg_match('{^<(?:' . $this->contain_span_tags_re . ')\b}', $tag);
-					
+
 					// Calculate indent before tag.
 					if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) {
 						$strlen = $this->utf8_strlen;
@@ -701,48 +707,48 @@ class MarkdownExtra extends \Michelf\Markdown {
 					} 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, 
+						= $this->_hashHTMLBlocks_inMarkdown($text, $indent,
 							$tag_name_re, $span_mode);
-					
+
 					// Outdent markdown text.
 					if ($indent > 0) {
-						$block_text = preg_replace("/^[ ]{1,$indent}/m", "", 
+						$block_text = preg_replace("/^[ ]{1,$indent}/m", "",
 													$block_text);
 					}
-					
+
 					// Append tag content to parsed text.
 					if (!$span_mode)	$parsed .= "\n\n$block_text\n\n";
 					else				$parsed .= "$block_text";
-					
+
 					// Start over with a new block.
 					$block_text = "";
 				}
 				else $block_text .= $tag;
 			}
-			
+
 		} while ($depth > 0);
-		
+
 		// Hash last block text that wasn't processed inside the loop.
 		$parsed .= $this->$hash_method($block_text);
-		
+
 		return array($parsed, $text);
 	}
 
 	/**
 	 * 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, 
+	 * in $text, it passes through this function and is automaticaly escaped,
 	 * blocking invalid nested overlap.
 	 * @param  string $text
 	 * @return string
@@ -835,7 +841,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			// 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}', ' ', $link_id);
@@ -843,7 +849,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		if (isset($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];
@@ -852,7 +858,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			}
 			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);
@@ -889,7 +895,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			$result .=  " title=\"$title\"";
 		}
 		$result .= $attr;
-		
+
 		$link_text = $this->runSpanGamut($link_text);
 		$result .= ">$link_text</a>";
 
@@ -917,7 +923,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 			  \]
 
 			)
-			}xs', 
+			}xs',
 			array($this, '_doImages_reference_callback'), $text);
 
 		// Next, handle inline images:  ![alt text](url "optional title")
@@ -1021,7 +1027,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		// Setext-style headers:
 		//  Header 1  {#header1}
 		//	  ========
-		//  
+		//
 		//	  Header 2  {#header2 .class1 .class2}
 		//	  --------
 		//
@@ -1042,7 +1048,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		//
 		$text = preg_replace_callback('{
 				^(\#{1,6})	# $1 = string of #\'s
-				[ ]*
+				[ ]'.($this->hashtag_protection ? '+' : '*').'
 				(.+?)		# $2 = Header text
 				[ ]*
 				\#*			# optional closing #\'s (not counted)
@@ -1107,10 +1113,10 @@ class MarkdownExtra extends \Michelf\Markdown {
 				[ ]{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.
@@ -1132,10 +1138,10 @@ class MarkdownExtra extends \Michelf\Markdown {
 				^							# 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
@@ -1159,7 +1165,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$content	= $matches[3];
 
 		$content	= preg_replace('/^ *[|]/m', '', $content);
-		
+
 		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
 	}
 
@@ -1192,7 +1198,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$head		= preg_replace('/[|] *$/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) {
@@ -1205,14 +1211,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 			else
 				$attr[$n] = '';
 		}
-		
-		// Parsing span elements, including code spans, character escapes, 
+
+		// 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";
@@ -1221,20 +1227,20 @@ class MarkdownExtra extends \Michelf\Markdown {
 			$text .= "  <th$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, 
+			// 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";
@@ -1242,7 +1248,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		}
 		$text .= "</tbody>\n";
 		$text .= "</table>";
-		
+
 		return $this->hashBlock($text) . "\n";
 	}
 
@@ -1299,7 +1305,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	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($list));
@@ -1314,9 +1320,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @return string
 	 */
 	protected function processDefListItems($list_str) {
-	
+
 		$less_than_tab = $this->tab_width - 1;
-		
+
 		// Trim trailing blank lines:
 		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
 
@@ -1327,9 +1333,9 @@ class MarkdownExtra extends \Michelf\Markdown {
 				[ ]{0,' . $less_than_tab . '}	# leading whitespace
 				(?!\:[ ]|[ ])					# negative lookahead for a definition
 												#   mark (colon) or more whitespace.
-				(?> \S.* \n)+?					# actual term (not whitespace).	
-			)			
-			(?=\n?[ ]{0,3}:[ ])					# lookahead for following line feed 
+				(?> \S.* \n)+?					# actual term (not whitespace).
+			)
+			(?=\n?[ ]{0,3}:[ ])					# lookahead for following line feed
 												#   with a definition mark.
 			}xm',
 			array($this, '_processDefListItems_callback_dt'), $list_str);
@@ -1346,8 +1352,8 @@ class MarkdownExtra extends \Michelf\Markdown {
 				(?:								# next term or end of text
 					[ ]{0,' . $less_than_tab . '} \:[ ]	|
 					<dt> | \z
-				)						
-			)					
+				)
+			)
 			}xm',
 			array($this, '_processDefListItems_callback_dd'), $list_str);
 
@@ -1399,14 +1405,14 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * ~~~
 	 * Code block
 	 * ~~~
-	 * 
+	 *
 	 * @param  string $text
 	 * @return string
 	 */
 	protected function doFencedCodeBlocks($text) {
-	
+
 		$less_than_tab = $this->tab_width;
-		
+
 		$text = preg_replace_callback('{
 				(?:\n|\A)
 				# 1: Opening marker
@@ -1422,7 +1428,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 					' . $this->id_class_attr_catch_re . ' # 3: Extra attributes
 				)?
 				[ ]* \n # Whitespace and newline following marker.
-				
+
 				# 4: Content
 				(
 					(?>
@@ -1430,7 +1436,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 						.*\n+
 					)+
 				)
-				
+
 				# Closing marker.
 				\1 [ ]* (?= \n )
 			}xm',
@@ -1468,7 +1474,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		$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";
 	}
 
@@ -1478,7 +1484,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @return string
 	 */
 	protected function _doFencedCodeBlocks_newlines($matches) {
-		return str_repeat("<br$this->empty_element_suffix", 
+		return str_repeat("<br$this->empty_element_suffix",
 			strlen($matches[0]));
 	}
 
@@ -1518,27 +1524,27 @@ class MarkdownExtra extends \Michelf\Markdown {
 		// 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. 
+
+		// 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.
@@ -1554,15 +1560,15 @@ class MarkdownExtra extends \Michelf\Markdown {
 			  [ ]*
 			  \n?					# maybe *one* newline
 			(						# text = $2 (no blank lines allowed)
-				(?:					
+				(?:
 					.+				# actual text
 				|
-					\n				# newlines but 
+					\n				# newlines but
 					(?!\[.+?\][ ]?:\s)# negative lookahead for footnote or link definition marker.
-					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed 
+					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
 									# by non-indented content
 				)*
-			)		
+			)
 			}xm',
 			array($this, '_stripFootnotes_callback'),
 			$text);
@@ -1581,7 +1587,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	}
 
 	/**
-	 * Replace footnote references in $text [^id] with a special text-token 
+	 * Replace footnote references in $text [^id] with a special text-token
 	 * which will be replaced by the actual footnote marker in appendFootnotes.
 	 * @param  string $text
 	 * @return string
@@ -1599,12 +1605,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 * @return string
 	 */
 	protected function appendFootnotes($text) {
-		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
+		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
 			array($this, '_appendFootnotes_callback'), $text);
-	
+
 		if (!empty($this->footnotes_ordered)) {
 			$text .= "\n\n";
-			$text .= "<div class=\"footnotes\">\n";
+			$text .= "<div class=\"footnotes\" role=\"doc-endnotes\">\n";
 			$text .= "<hr" . $this->empty_element_suffix . "\n";
 			$text .= "<ol>\n\n";
 
@@ -1618,10 +1624,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$title = $this->fn_backlink_title;
 				$title = $this->encodeAttribute($title);
 				$attr .= " title=\"$title\"";
+				$attr .= " aria-label=\"$title\"";
 			}
+			$attr .= " role=\"doc-backlink\"";
 			$backlink_text = $this->fn_backlink_html;
 			$num = 0;
-			
+
 			while (!empty($this->footnotes_ordered)) {
 				$footnote = reset($this->footnotes_ordered);
 				$note_id = key($this->footnotes_ordered);
@@ -1629,12 +1637,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$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:}', 
+				$footnote = $this->runBlockGamut("$footnote\n");
+				$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
 					array($this, '_appendFootnotes_callback'), $footnote);
-				
+
 				$attr = str_replace("%%", ++$num, $attr);
 				$note_id = $this->encodeAttribute($note_id);
 
@@ -1649,12 +1657,12 @@ class MarkdownExtra extends \Michelf\Markdown {
 				} else {
 					$footnote .= "\n\n<p>$backlink</p>";
 				}
-				
-				$text .= "<li id=\"fn:$note_id\">\n";
+
+				$text .= "<li id=\"fn:$note_id\" role=\"doc-endnote\">\n";
 				$text .= $footnote . "\n";
 				$text .= "</li>\n\n";
 			}
-			
+
 			$text .= "</ol>\n";
 			$text .= "</div>";
 		}
@@ -1668,7 +1676,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function _appendFootnotes_callback($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])) {
@@ -1695,20 +1703,21 @@ class MarkdownExtra extends \Michelf\Markdown {
 				$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] . "]";
 	}
-		
-	
+
+
 	/**
 	 * Abbreviations - strips abbreviations from text, stores titles in hash
 	 * references.
@@ -1721,7 +1730,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 		// 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)	
+			(.*)					# text = $2 (no blank lines allowed)
 			}xm',
 			array($this, '_stripAbbreviations_callback'),
 			$text);
@@ -1751,7 +1760,7 @@ class MarkdownExtra extends \Michelf\Markdown {
 	 */
 	protected function doAbbreviations($text) {
 		if ($this->abbr_word_re) {
-			// cannot use the /x modifier because abbr_word_re may 
+			// cannot use the /x modifier because abbr_word_re may
 			// contain significant spaces:
 			$text = preg_replace_callback('{' .
 				'(?<![\w\x1A])' .
diff --git a/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php b/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php
index 8512e3753..7fc0da06e 100644
--- a/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php
+++ b/vendor/michelf/php-markdown/Michelf/MarkdownInterface.php
@@ -4,14 +4,14 @@
  *
  * @package   php-markdown
  * @author    Michel Fortin <michel.fortin@michelf.com>
- * @copyright 2004-2016 Michel Fortin <https://michelf.com/projects/php-markdown/>
+ * @copyright 2004-2018 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 
+ * Markdown Parser Interface
  */
 interface MarkdownInterface {
 	/**