simplify test for em strong

Prior to PHP 5.4.0 the default encoding for `htmlentities()`
and `htmlspecialchars` is "ISO-8859-1". For PHP 5.4+ is "UTF-8".

This ensures always the right encoding is used no matter the PHP version
and the locale settings.

.travis.yml

@@ -5,7 +5,3 @@ php:
   - 5.4
   - 5.3
   - 5.2
-
-matrix:
-  allow_failures:
-    - php: 5.2

Parsedown.php

@@ -46,17 +46,17 @@ class Parsedown
 
 	function parse($text)
 	{
-		# Removes UTF-8 BOM and marker characters.
+		# removes UTF-8 BOM and marker characters
 		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
 
-		# Removes \r characters.
+		# removes \r characters
 		$text = str_replace("\r\n", "\n", $text);
 		$text = str_replace("\r", "\n", $text);
 
-		# Replaces tabs with spaces.
+		# replaces tabs with spaces
 		$text = str_replace("\t", '    ', $text);
 
-		# Encodes escape sequences.
+		# encodes escape sequences
 
 		if (strpos($text, '\\') !== FALSE)
 		{
@@ -84,7 +84,7 @@ class Parsedown
 
 		$text = $this->parse_block_elements($lines);
 
-		# Decodes escape sequences (leaves out backslashes).
+		# decodes escape sequences
 
 		foreach ($this->escape_sequence_map as $code => $escape_sequence)
 		{
@@ -110,28 +110,56 @@ class Parsedown
 
 		foreach ($lines as $line)
 		{
-			# Block-Level HTML
+			#
+			# fenced elements
 
-			if ($element['type'] === 'block' and ! isset($element['closed']))
+			switch ($element['type'])
 			{
-				if (preg_match('{<'.$element['subtype'].'>$}', $line)) # <open>
+				case 'fenced_code_block':
-				{
-					$element['depth']++;
-				}
 
-				if (preg_match('{</'.$element['subtype'].'>$}', $line)) # </close>
+					if ( ! isset($element['closed']))
-				{
+					{
-					$element['depth'] > 0
+						if (preg_match('/^[ ]*'.$element['fence'][0].'{3,}[ ]*$/', $line))
-						? $element['depth']--
+						{
-						: $element['closed'] = true;
+							$element['closed'] = true;
-				}
+						}
+						else
+						{
+							$element['text'] !== '' and $element['text'] .= "\n";
 
-				$element['text'] .= "\n".$line;
+							$element['text'] .= $line;
+						}
 
-				continue;
+						continue 2;
+					}
+
+					break;
+
+				case 'markup':
+
+					if ( ! isset($element['closed']))
+					{
+						if (preg_match('{<'.$element['subtype'].'>$}', $line)) # opening tag
+						{
+							$element['depth']++;
+						}
+
+						if (preg_match('{</'.$element['subtype'].'>$}', $line)) # closing tag
+						{
+							$element['depth'] > 0
+								? $element['depth']--
+								: $element['closed'] = true;
+						}
+
+						$element['text'] .= "\n".$line;
+
+						continue 2;
+					}
+
+					break;
 			}
 
-			# Empty
+			# *
 
 			if ($line === '')
 			{
@@ -140,269 +168,330 @@ class Parsedown
 				continue;
 			}
 
-			# Lazy Blockquote
+			#
+			# composite elements
 
-			if ($element['type'] === 'blockquote' and ! isset($element['interrupted']))
+			switch ($element['type'])
 			{
-				$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
+				case 'blockquote':
 
-				$element['lines'] []= $line;
+					if ( ! isset($element['interrupted']))
-
-				continue;
-			}
-
-			# Lazy List Item
-
-			if ($element['type'] === 'li')
-			{
-				if (preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
-				{
-					if ($element['indentation'] !== $matches[1])
 					{
+						$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
+
 						$element['lines'] []= $line;
+
+						continue 2;
+					}
+
+					break;
+
+				case 'li':
+
+					if (preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
+					{
+						if ($element['indentation'] !== $matches[1])
+						{
+							$element['lines'] []= $line;
+						}
+						else
+						{
+							unset($element['last']);
+
+							$elements []= $element;
+
+							$element = array(
+								'type' => 'li',
+								'indentation' => $matches[1],
+								'last' => true,
+								'lines' => array(
+									preg_replace('/^[ ]{0,4}/', '', $matches[3]),
+								),
+							);
+						}
+
+						continue 2;
+					}
+
+					if (isset($element['interrupted']))
+					{
+						if ($line[0] === ' ')
+						{
+							$element['lines'] []= '';
+
+							$line = preg_replace('/^[ ]{0,4}/', '', $line);
+
+							$element['lines'] []= $line;
+
+							continue 2;
+						}
 					}
 					else
 					{
-						unset($element['last']);
+						$line = preg_replace('/^[ ]{0,4}/', '', $line);
 
+						$element['lines'] []= $line;
+
+						continue 2;
+					}
+
+					break;
+			}
+
+			#
+			# indentation sensitive types
+
+			$deindented_line = $line;
+
+			switch ($line[0])
+			{
+				case ' ':
+
+					# ~
+
+					$deindented_line = ltrim($line);
+
+					if ($deindented_line === '')
+					{
+						continue 2;
+					}
+
+					# code block
+
+					if (preg_match('/^[ ]{4}(.*)/', $line, $matches))
+					{
+						if ($element['type'] === 'code_block')
+						{
+							if (isset($element['interrupted']))
+							{
+								$element['text'] .= "\n";
+
+								unset ($element['interrupted']);
+							}
+
+							$element['text'] .= "\n".$matches[1];
+						}
+						else
+						{
+							$elements []= $element;
+
+							$element = array(
+								'type' => 'code_block',
+								'text' => $matches[1],
+							);
+						}
+
+						continue 2;
+					}
+
+					break;
+
+				case '#':
+
+					# atx heading (#)
+
+					if (preg_match('/^(#{1,6})[ ]*(.+?)[ ]*#*$/', $line, $matches))
+					{
+						$elements []= $element;
+
+						$level = strlen($matches[1]);
+
+						$element = array(
+							'type' => 'h.',
+							'text' => $matches[2],
+							'level' => $level,
+						);
+
+						continue 2;
+					}
+
+					break;
+
+				case '-':
+
+					# setext heading (---)
+
+					if ($line[0] === '-' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[-]+[ ]*$/', $line))
+					{
+						$element['type'] = 'h.';
+						$element['level'] = 2;
+
+						continue 2;
+					}
+
+					break;
+
+				case '=':
+
+					# setext heading (===)
+
+					if ($line[0] === '=' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[=]+[ ]*$/', $line))
+					{
+						$element['type'] = 'h.';
+						$element['level'] = 1;
+
+						continue 2;
+					}
+
+					break;
+			}
+
+			#
+			# indentation insensitive types
+
+			switch ($deindented_line[0])
+			{
+				case '<':
+
+					# self-closing tag
+
+					if (preg_match('{^<.+?/>$}', $deindented_line))
+					{
+						$elements []= $element;
+
+						$element = array(
+							'type' => '',
+							'text' => $deindented_line,
+						);
+
+						continue 2;
+					}
+
+					# opening tag
+
+					if (preg_match('{^<(\w+)(?:[ ].*?)?>}', $deindented_line, $matches))
+					{
+						$elements []= $element;
+
+						$element = array(
+							'type' => 'markup',
+							'subtype' => strtolower($matches[1]),
+							'text' => $deindented_line,
+							'depth' => 0,
+						);
+
+						preg_match('{</'.$matches[1].'>\s*$}', $deindented_line) and $element['closed'] = true;
+
+						continue 2;
+					}
+
+					break;
+
+				case '>':
+
+					# quote
+
+					if (preg_match('/^>[ ]?(.*)/', $deindented_line, $matches))
+					{
+						$elements []= $element;
+
+						$element = array(
+							'type' => 'blockquote',
+							'lines' => array(
+								$matches[1],
+							),
+						);
+
+						continue 2;
+					}
+
+					break;
+
+				case '[':
+
+					# reference
+
+					if (preg_match('/^\[(.+?)\]:[ ]*([^ ]+)/', $deindented_line, $matches))
+					{
+						$label = strtolower($matches[1]);
+
+						$this->reference_map[$label] = trim($matches[2], '<>');;
+
+						continue 2;
+					}
+
+					break;
+
+				case '`':
+				case '~':
+
+					# fenced code block
+
+					if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\S+)?[ ]*$/', $deindented_line, $matches))
+					{
+						$elements []= $element;
+
+						$element = array(
+							'type' => 'fenced_code_block',
+							'text' => '',
+							'fence' => $matches[1],
+						);
+
+						isset($matches[2]) and $element['language'] = $matches[2];
+
+						continue 2;
+					}
+
+					break;
+
+				case '*':
+				case '+':
+				case '-':
+				case '_':
+
+					# hr
+
+					if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $deindented_line))
+					{
+						$elements []= $element;
+
+						$element = array(
+							'type' => 'hr',
+						);
+
+						continue 2;
+					}
+
+					# li
+
+					if (preg_match('/^([ ]*)[*+-][ ](.*)/', $line, $matches))
+					{
 						$elements []= $element;
 
 						$element = array(
 							'type' => 'li',
+							'ordered' => false,
 							'indentation' => $matches[1],
 							'last' => true,
 							'lines' => array(
-								preg_replace('/^[ ]{0,4}/', '', $matches[3]),
+								preg_replace('/^[ ]{0,4}/', '', $matches[2]),
 							),
 						);
+
+						continue 2;
 					}
-
-					continue;
-				}
-
-				if (isset($element['interrupted']))
-				{
-					if ($line[0] === ' ')
-					{
-						$element['lines'] []= '';
-
-						$line = preg_replace('/^[ ]{0,4}/', '', $line);;
-
-						$element['lines'] []= $line;
-
-						continue;
-					}
-				}
-				else
-				{
-					$line = preg_replace('/^[ ]{0,4}/', '', $line);;
-
-					$element['lines'] []= $line;
-
-					continue;
-				}
 			}
 
-			# Quick Paragraph
+			# li
 
-			if ($line[0] >= 'a' or $line[0] >= 'A' and $line[0] <= 'Z')
+			if ($deindented_line[0] <= '9' and $deindented_line >= '0' and preg_match('/^([ ]*)\d+[.][ ](.*)/', $line, $matches))
-			{
-				goto paragraph;
-			}
-
-			# Code Block
-
-			if ($line[0] === ' ' and preg_match('/^[ ]{4}(.*)/', $line, $matches))
-			{
-				if (trim($line) === '')
-				{
-					continue;
-				}
-
-				if ($element['type'] === 'code')
-				{
-					if (isset($element['interrupted']))
-					{
-						$element['text'] .= "\n";
-
-						unset ($element['interrupted']);
-					}
-
-					$element['text'] .= "\n".$matches[1];
-				}
-				else
-				{
-					$elements []= $element;
-
-					$element = array(
-						'type' => 'code',
-						'text' => $matches[1],
-					);
-				}
-
-				continue;
-			}
-
-			# Setext Header (---)
-
-			if ($line[0] === '-' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[-]+[ ]*$/', $line))
-			{
-				$element['type'] = 'h.';
-				$element['level'] = 2;
-
-				continue;
-			}
-
-			# Atx Header (#)
-
-			if ($line[0] === '#' and preg_match('/^(#{1,6})[ ]*(.+?)[ ]*#*$/', $line, $matches))
-			{
-				$elements []= $element;
-
-				$level = strlen($matches[1]);
-
-				$element = array(
-					'type' => 'h.',
-					'text' => $matches[2],
-					'level' => $level,
-				);
-
-				continue;
-			}
-
-			# Setext Header (===)
-
-			if ($line[0] === '=' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[=]+[ ]*$/', $line))
-			{
-				$element['type'] = 'h.';
-				$element['level'] = 1;
-
-				continue;
-			}
-
-			# ~
-
-			$pure_line = $line[0] !== ' ' ? $line : ltrim($line);
-
-			if ($pure_line === '')
-			{
-				continue;
-			}
-
-			# Link Reference
-
-			if ($pure_line[0] === '[' and preg_match('/^\[(.+?)\]:[ ]*([^ ]+)/', $pure_line, $matches))
-			{
-				$label = strtolower($matches[1]);
-				$url = trim($matches[2], '<>');
-
-				$this->reference_map[$label] = $url;
-
-				continue;
-			}
-
-			# Blockquote
-
-			if ($pure_line[0] === '>' and preg_match('/^>[ ]?(.*)/', $pure_line, $matches))
-			{
-				if ($element['type'] === 'blockquote')
-				{
-					if (isset($element['interrupted']))
-					{
-						$element['lines'] []= '';
-
-						unset($element['interrupted']);
-					}
-
-					$element['lines'] []= $matches[1];
-				}
-				else
-				{
-					$elements []= $element;
-
-					$element = array(
-						'type' => 'blockquote',
-						'lines' => array(
-							$matches[1],
-						),
-					);
-				}
-
-				continue;
-			}
-
-			# HTML
-
-			if ($pure_line[0] === '<')
-			{
-				# Block-Level HTML <self-closing/>
-
-				if (preg_match('{^<.+?/>$}', $pure_line))
-				{
-					$elements []= $element;
-
-					$element = array(
-						'type' => '',
-						'text' => $pure_line,
-					);
-
-					continue;
-				}
-
-				# Block-Level HTML <open>
-
-				if (preg_match('{^<(\w+)(?:[ ].*?)?>}', $pure_line, $matches))
-				{
-					$elements []= $element;
-
-					$element = array(
-						'type' => 'block',
-						'subtype' => strtolower($matches[1]),
-						'text' => $pure_line,
-						'depth' => 0,
-					);
-
-					preg_match('{</'.$matches[1].'>\s*$}', $pure_line) and $element['closed'] = true;
-
-					continue;
-				}
-			}
-
-			# Horizontal Rule
-
-			if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $pure_line))
-			{
-				$elements []= $element;
-
-				$element = array(
-					'type' => 'hr',
-				);
-
-				continue;
-			}
-
-			# List Item
-
-			if (preg_match('/^([ ]*)(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
 			{
 				$elements []= $element;
 
 				$element = array(
 					'type' => 'li',
-					'ordered' => isset($matches[2][1]),
+					'ordered' => true,
 					'indentation' => $matches[1],
 					'last' => true,
 					'lines' => array(
-						preg_replace('/^[ ]{0,4}/', '', $matches[3]),
+						preg_replace('/^[ ]{0,4}/', '', $matches[2]),
 					),
 				);
 
 				continue;
 			}
 
-			# ~
+			# paragraph
-
-			paragraph:
 
 			if ($element['type'] === 'p')
 			{
@@ -432,7 +521,7 @@ class Parsedown
 
 		$elements []= $element;
 
-		array_shift($elements);
+		unset($elements[0]);
 
 		#
 		# ~
@@ -440,10 +529,67 @@ class Parsedown
 
 		$markup = '';
 
-		foreach ($elements as $index => $element)
+		foreach ($elements as $element)
 		{
 			switch ($element['type'])
 			{
+				case 'p':
+
+					$text = $this->parse_span_elements($element['text']);
+
+					$text = preg_replace('/[ ]{2}\n/', '<br />'."\n", $text);
+
+					if ($context === 'li' and $markup === '')
+					{
+						if (isset($element['interrupted']))
+						{
+							$markup .= "\n".'<p>'.$text.'</p>'."\n";
+						}
+						else
+						{
+							$markup .= $text;
+						}
+					}
+					else
+					{
+						$markup .= '<p>'.$text.'</p>'."\n";
+					}
+
+					break;
+
+				case 'blockquote':
+
+					$text = $this->parse_block_elements($element['lines']);
+
+					$markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
+
+					break;
+
+				case 'code_block':
+				case 'fenced_code_block':
+
+					$text = htmlspecialchars($element['text'], ENT_NOQUOTES, 'UTF-8');
+
+					strpos($text, "\x1A\\") !== FALSE and $text = strtr($text, $this->escape_sequence_map);
+
+					$markup .= '<pre><code>'.$text.'</code></pre>'."\n";
+
+					break;
+
+				case 'h.':
+
+					$text = $this->parse_span_elements($element['text']);
+
+					$markup .= '<h'.$element['level'].'>'.$text.'</h'.$element['level'].'>'."\n";
+
+					break;
+
+				case 'hr':
+
+					$markup .= '<hr />'."\n";
+
+					break;
+
 				case 'li':
 
 					if (isset($element['ordered'])) # first
@@ -466,62 +612,6 @@ class Parsedown
 
 					break;
 
-				case 'p':
-
-					$text = $this->parse_inline_elements($element['text']);
-
-					$text = preg_replace('/[ ]{2}\n/', '<br />'."\n", $text);
-
-					if ($context === 'li' and $index === 0)
-					{
-						if (isset($element['interrupted']))
-						{
-							$markup .= "\n".'<p>'.$text.'</p>'."\n";
-						}
-						else
-						{
-							$markup .= $text;
-						}
-					}
-					else
-					{
-						$markup .= '<p>'.$text.'</p>'."\n";
-					}
-
-					break;
-
-				case 'code':
-
-					$text = htmlentities($element['text'], ENT_NOQUOTES);
-
-					strpos($text, "\x1A\\") !== FALSE and $text = strtr($text, $this->escape_sequence_map);
-
-					$markup .= '<pre><code>'.$text.'</code></pre>'."\n";
-
-					break;
-
-				case 'blockquote':
-
-					$text = $this->parse_block_elements($element['lines']);
-
-					$markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
-
-					break;
-
-				case 'h.':
-
-					$text = $this->parse_inline_elements($element['text']);
-
-					$markup .= '<h'.$element['level'].'>'.$text.'</h'.$element['level'].'>'."\n";
-
-					break;
-
-				case 'hr':
-
-					$markup .= '<hr />'."\n";
-
-					break;
-
 				default:
 
 					$markup .= $element['text']."\n";
@@ -531,32 +621,32 @@ class Parsedown
 		return $markup;
 	}
 
-	private function parse_inline_elements($text)
+	private function parse_span_elements($text)
 	{
 		$map = array();
 
 		$index = 0;
 
-		# Code Span
+		# code span
 
 		if (strpos($text, '`') !== FALSE and preg_match_all('/`(.+?)`/', $text, $matches, PREG_SET_ORDER))
 		{
 			foreach ($matches as $matches)
 			{
 				$element_text = $matches[1];
-				$element_text = htmlentities($element_text, ENT_NOQUOTES);
+				$element_text = htmlspecialchars($element_text, ENT_NOQUOTES, 'UTF-8');
 
-				# Decodes escape sequences.
+				# decodes escape sequences
 
 				$this->escape_sequence_map
 					and strpos($element_text, "\x1A") !== FALSE
 					and $element_text = strtr($element_text, $this->escape_sequence_map);
 
-				# Composes element.
+				# composes element
 
 				$element = '<code>'.$element_text.'</code>';
 
-				# Encodes element.
+				# encodes element
 
 				$code = "\x1A".'$'.$index;
 
@@ -568,7 +658,7 @@ class Parsedown
 			}
 		}
 
-		# Inline Link / Image
+		# inline link or image
 
 		if (strpos($text, '](') !== FALSE and preg_match_all('/(!?)(\[((?:[^\[\]]|(?2))*)\])\((.*?)\)/', $text, $matches, PREG_SET_ORDER)) # inline
 		{
@@ -584,7 +674,7 @@ class Parsedown
 				}
 				else
 				{
-					$element_text = $this->parse_inline_elements($matches[3]);
+					$element_text = $this->parse_span_elements($matches[3]);
 
 					$element = '<a href="'.$url.'">'.$element_text.'</a>';
 				}
@@ -601,7 +691,7 @@ class Parsedown
 			}
 		}
 
-		# Reference(d) Link / Image
+		# reference link or image
 
 		if ($this->reference_map and strpos($text, '[') !== FALSE and preg_match_all('/(!?)\[(.+?)\](?:\n?[ ]?\[(.*?)\])?/ms', $text, $matches, PREG_SET_ORDER))
 		{
@@ -625,7 +715,7 @@ class Parsedown
 					}
 					else # anchor
 					{
-						$element_text = $this->parse_inline_elements($matches[2]);
+						$element_text = $this->parse_span_elements($matches[2]);
 
 						$element = '<a href="'.$url.'">'.$element_text.'</a>';
 					}
@@ -643,29 +733,35 @@ class Parsedown
 			}
 		}
 
-		# Automatic Links
+		if (strpos($text, '://') !== FALSE)
-
-		if (strpos($text, '<') !== FALSE and preg_match_all('/<((https?|ftp|dict):[^\^\s]+?)>/i', $text, $matches, PREG_SET_ORDER))
 		{
-			foreach ($matches as $matches)
+			switch (TRUE)
 			{
-				$url = $matches[1];
+				case preg_match_all('{<(https?:[/]{2}[^\s]+)>}i', $text, $matches, PREG_SET_ORDER):
+				case preg_match_all('{\b(https?:[/]{2}[^\s]+)\b}i', $text, $matches, PREG_SET_ORDER):
 
-				strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&amp;', $url);
+					foreach ($matches as $matches)
+					{
+						$url = $matches[1];
 
-				$element = '<a href=":href">:text</a>';
+						strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&amp;', $url);
-				$element = str_replace(':text', $url, $element);
-				$element = str_replace(':href', $url, $element);
 
-				# ~
+						$element = '<a href=":href">:text</a>';
+						$element = str_replace(':text', $url, $element);
+						$element = str_replace(':href', $url, $element);
 
-				$code = "\x1A".'$'.$index;
+						# ~
 
-				$text = str_replace($matches[0], $code, $text);
+						$code = "\x1A".'$'.$index;
 
-				$map[$code] = $element;
+						$text = str_replace($matches[0], $code, $text);
 
-				$index ++;
+						$map[$code] = $element;
+
+						$index ++;
+					}
+
+					break;
 			}
 		}
 
@@ -676,16 +772,26 @@ class Parsedown
 
 		# ~
 
+		if (strpos($text, '~~') !== FALSE)
+		{
+			$text = preg_replace('/~~(?=\S)(.+?)(?<=\S)~~/s', '<del>$1</del>', $text);
+		}
+
 		if (strpos($text, '_') !== FALSE)
 		{
-			$text = preg_replace('/__(?=\S)(.+?)(?<=\S)__(?!_)/s', '<strong>$1</strong>', $text);
+			$text = preg_replace('/__(?=\S)([^_]+?)(?<=\S)__/s', '<strong>$1</strong>', $text, -1, $count);
-			$text = preg_replace('/_(?=\S)(.+?)(?<=\S)_/s', '<em>$1</em>', $text);
+			$count or $text = preg_replace('/__(?=\S)(.+?)(?<=\S)__(?!_)/s', '<strong>$1</strong>', $text);
+
+			$text = preg_replace('/\b_(?=\S)(.+?)(?<=\S)_\b/s', '<em>$1</em>', $text);
 		}
 
 		if (strpos($text, '*') !== FALSE)
 		{
-			$text = preg_replace('/\*\*(?=\S)(.+?)(?<=\S)\*\*(?!\*)/s', '<strong>$1</strong>', $text);
+			$text = preg_replace('/\*\*(?=\S)([^*]+?)(?<=\S)\*\*/s', '<strong>$1</strong>', $text, -1, $count);
-			$text = preg_replace('/\*(?=\S)(.+?)(?<=\S)\*/s', '<em>$1</em>', $text);
+			$count or $text = preg_replace('/\*\*(?=\S)(.+?)(?<=\S)\*\*(?!\*)/s', '<strong>$1</strong>', $text);
+
+			$text = preg_replace('/\*(?=\S)([^*]+?)(?<=\S)\*/s', '<em>$1</em>', $text, -1, $count);
+			$count or $text = preg_replace('/\*(?=\S)(.+?)(?<=\S)\*(?!\*)/s', '<em>$1</em>', $text);
 		}
 
 		$text = strtr($text, $map);

README.md

@@ -1,6 +1,6 @@
-## Parsedown PHP
+## Parsedown
 
-Parsedown PHP is a parser for Markdown. It reads Markdown the way people do. First, it breaks texts into lines. Then, it looks at how these lines start and relate to each other. Finally, it looks for special characters to identify inline elements. As a result, Parsedown PHP is (very) fast and consistent.
+Fast and consistent [Markdown][1] parser for PHP.
 
 [Home](http://parsedown.org) · [Demo](http://parsedown.org/explorer/) · [Tests](http://parsedown.org/tests/)
 
@@ -17,3 +17,5 @@ $result = Parsedown::instance()->parse($text);
 
 echo $result; # prints: <p>Hello <strong>Parsedown</strong>!</p>
 ```
+
+[1]: http://daringfireball.net/projects/markdown/

tests/Test.php

@@ -20,20 +20,29 @@ class Test extends PHPUnit_Framework_TestCase
 	{
 		$provider = array();
 
-		$DirectoryIterator = new DirectoryIterator(__DIR__ . '/' . self::provider_dir);
+		$path = dirname(__FILE__).'/';
+
+		$DirectoryIterator = new DirectoryIterator($path . '/' . self::provider_dir);
 
 		foreach ($DirectoryIterator as $Item)
 		{
-			if ($Item->isFile() and $Item->getExtension() === 'md')
+			if ($Item->isFile())
 			{
+				$filename = $Item->getFilename();
+
+				$extension = pathinfo($filename, PATHINFO_EXTENSION);
+
+				if ($extension !== 'md')
+					continue;
+
 				$basename = $Item->getBasename('.md');
 
-				$markdown = file_get_contents(__DIR__ . '/' . self::provider_dir . $basename . '.md');
+				$markdown = file_get_contents($path . '/' . self::provider_dir . $basename . '.md');
 
 				if (!$markdown)
 					continue;
 
-				$expected_markup = file_get_contents(__DIR__ . '/' . self::provider_dir . $basename . '.html');
+				$expected_markup = file_get_contents($path . '/' . self::provider_dir . $basename . '.html');
 				$expected_markup = str_replace("\r\n", "\n", $expected_markup);
 				$expected_markup = str_replace("\r", "\n", $expected_markup);
 
@@ -44,4 +53,3 @@ class Test extends PHPUnit_Framework_TestCase
 		return $provider;
 	}
 }
-

tests/data/em_strong.html

@@ -1,5 +1,4 @@
-<p><strong><em>em strong</em></strong></p>
+<p><strong><em>em strong</em> strong</strong></p>
-<p><strong><em>one</em> at the start</strong></p>
+<p><strong>strong <em>em strong</em></strong></p>
-<p><strong>one at the <em>end</em></strong></p>
+<p><strong>strong <em>em strong</em> strong</strong></p>
-<p><strong>one <em>in the</em> middle</strong></p>
+<p><strong>strong <em>em strong</em></strong></p>
-<p><strong>one with <em>asterisks</em></strong></p>

tests/data/em_strong.md

@@ -1,9 +1,7 @@
-___em strong___
+___em strong_ strong__
 
-___one_ at the start__
+__strong _em strong___
 
-__one at the _end___
+__strong _em strong_ strong__
 
-__one _in the_ middle__
+**strong *em strong***
-
-**one with *asterisks***

tests/data/emphasis.html

@@ -2,4 +2,5 @@
 <p><em>multiline
 emphasis</em></p>
 <p>_ this _ is not an emphasis, neither is _ this_, _this _, or _this*</p>
+<p>this_is_not_an_emphasis</p>
 <p>an empty emphasis __ ** is not an emphasis</p>

tests/data/emphasis.md

@@ -5,4 +5,6 @@ emphasis_
 
 _ this _ is not an emphasis, neither is _ this_, _this _, or _this*
 
+this_is_not_an_emphasis
+
 an empty emphasis __ ** is not an emphasis

tests/data/fenced_code_block.html

@@ -0,0 +1,5 @@
+<pre><code>&lt;?php
+
+$message = 'fenced code block';
+echo $message;</code></pre>
+<pre><code>tilde</code></pre>

tests/data/fenced_code_block.md

@@ -0,0 +1,10 @@
+```
+<?php
+
+$message = 'fenced code block';
+echo $message;
+```
+
+~~~
+tilde
+~~~

tests/data/special_characters.html

@@ -1,4 +1,5 @@
 <p>AT&amp;T has an ampersand in their name</p>
+<pre><code>Let's play some cards ♠ ♣ ♥ ♦</code></pre>
 <p>AT&amp;T is another way to write it</p>
 <p>this &amp; that</p>
 <p>4 &lt; 5 and 6 > 5</p>

tests/data/special_characters.md

@@ -1,5 +1,7 @@
 AT&T has an ampersand in their name
 
+    Let's play some cards ♠ ♣ ♥ ♦
+
 AT&T is another way to write it
 
 this & that

tests/data/strikethrough.html

@@ -0,0 +1,3 @@
+<p><del>strikethrough</del></p>
+<p>in the <del>middle</del> of a sentence</p>
+<p>in the middle of a w<del>or</del>d</p>

tests/data/strikethrough.md

@@ -0,0 +1,5 @@
+~~strikethrough~~
+
+in the ~~middle~~ of a sentence
+
+in the middle of a w~~or~~d

tests/data/strong_em.html

@@ -0,0 +1,6 @@
+<p><em><strong>strong em</strong></em> </p>
+<p><em>em <strong>strong em</strong></em></p>
+<p><em><strong>strong em</strong> em</em></p>
+<p><em><strong>strong em</strong></em></p>
+<p><em>em <strong>strong em</strong></em></p>
+<p><em><strong>strong em</strong> em</em></p>

tests/data/strong_em.md

@@ -0,0 +1,11 @@
+***strong em*** 
+
+*em **strong em***
+
+***strong em** em*
+
+___strong em___
+
+_em __strong em___
+
+___strong em__ em_

tests/data/url_autolinking.html

@@ -0,0 +1 @@
+<p>Here's an autolink <a href="http://example.com">http://example.com</a>.</p>

tests/data/url_autolinking.md

@@ -0,0 +1 @@
+Here's an autolink http://example.com.