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authorFabio Bas <ctrlaltca@gmail.com>2014-02-12 15:39:31 +0100
committerFabio Bas <ctrlaltca@gmail.com>2014-02-12 15:39:31 +0100
commit5abbbca5332a4e5f9b8e5fb24a45611df9b874e2 (patch)
tree6265e26949d69c8516834e2eaaf4487cf5b07e56 /framework/3rdParty/Parsedown/Parsedown.php
parentb3c782faadcbd47a723b5cd0b08559e5964f37cf (diff)
Dropped Markdown for Parsedown
Diffstat (limited to 'framework/3rdParty/Parsedown/Parsedown.php')
-rwxr-xr-xframework/3rdParty/Parsedown/Parsedown.php1135
1 files changed, 1135 insertions, 0 deletions
diff --git a/framework/3rdParty/Parsedown/Parsedown.php b/framework/3rdParty/Parsedown/Parsedown.php
new file mode 100755
index 00000000..ebc80974
--- /dev/null
+++ b/framework/3rdParty/Parsedown/Parsedown.php
@@ -0,0 +1,1135 @@
+<?php
+
+#
+#
+# Parsedown
+# http://parsedown.org
+#
+# (c) Emanuil Rusev
+# http://erusev.com
+#
+# For the full license information, view the LICENSE file that was distributed
+# with this source code.
+#
+#
+
+class Parsedown
+{
+ # Multiton
+
+ static function instance($name = 'default')
+ {
+ if (isset(self::$instances[$name]))
+ {
+ return self::$instances[$name];
+ }
+
+ $instance = new Parsedown();
+
+ self::$instances[$name] = $instance;
+
+ return $instance;
+ }
+
+ private static $instances = array();
+
+ #
+ # Setters
+ #
+
+ # Enables GFM line breaks.
+
+ function set_breaks_enabled($breaks_enabled)
+ {
+ $this->breaks_enabled = $breaks_enabled;
+
+ return $this;
+ }
+
+ private $breaks_enabled = false;
+
+ #
+ # Synopsis
+ #
+
+ # Markdown is intended to be easy-to-read by humans - those of us who read
+ # line by line, left to right, top to bottom. In order to take advantage of
+ # this, Parsedown tries to read in a similar way. It breaks texts into
+ # lines, it iterates through them and it looks at how they start and relate
+ # to each other.
+
+ #
+ # Methods
+ #
+
+ function parse($text)
+ {
+ # standardize line breaks
+ $text = str_replace("\r\n", "\n", $text);
+ $text = str_replace("\r", "\n", $text);
+
+ # replace tabs with spaces
+ $text = str_replace("\t", ' ', $text);
+
+ # remove surrounding line breaks
+ $text = trim($text, "\n");
+
+ # split text into lines
+ $lines = explode("\n", $text);
+
+ # convert lines into html
+ $text = $this->parse_block_elements($lines);
+
+ # remove trailing line breaks
+ $text = chop($text, "\n");
+
+ return $text;
+ }
+
+ #
+ # Private
+
+ private function parse_block_elements(array $lines, $context = '')
+ {
+ $blocks = array();
+
+ $block = array(
+ 'type' => '',
+ );
+
+ foreach ($lines as $line)
+ {
+ # context
+
+ switch ($block['type'])
+ {
+ case 'fenced':
+
+ if ( ! isset($block['closed']))
+ {
+ if (preg_match('/^[ ]*'.$block['fence'][0].'{3,}[ ]*$/', $line))
+ {
+ $block['closed'] = true;
+ }
+ else
+ {
+ if ($block['text'] !== '')
+ {
+ $block['text'] .= "\n";
+ }
+
+ $block['text'] .= $line;
+ }
+
+ continue 2;
+ }
+
+ break;
+
+ case 'markup':
+
+ if ( ! isset($block['closed']))
+ {
+ if (strpos($line, $block['start']) !== false) # opening tag
+ {
+ $block['depth']++;
+ }
+
+ if (strpos($line, $block['end']) !== false) # closing tag
+ {
+ if ($block['depth'] > 0)
+ {
+ $block['depth']--;
+ }
+ else
+ {
+ $block['closed'] = true;
+ }
+ }
+
+ $block['text'] .= "\n".$line;
+
+ continue 2;
+ }
+
+ break;
+ }
+
+ # ~
+
+ $indentation = 0;
+
+ while(isset($line[$indentation]) and $line[$indentation] === ' ')
+ {
+ $indentation++;
+ }
+
+ $outdented_line = $indentation > 0 ? ltrim($line) : $line;
+
+ # blank
+
+ if ($outdented_line === '')
+ {
+ $block['interrupted'] = true;
+
+ continue;
+ }
+
+ # context
+
+ switch ($block['type'])
+ {
+ case 'quote':
+
+ if ( ! isset($block['interrupted']))
+ {
+ $line = preg_replace('/^[ ]*>[ ]?/', '', $line);
+
+ $block['lines'] []= $line;
+
+ continue 2;
+ }
+
+ break;
+
+ case 'li':
+
+ if ($block['indentation'] === $indentation and preg_match('/^'.$block['marker'].'[ ]+(.*)/', $outdented_line, $matches))
+ {
+ unset($block['last']);
+
+ $blocks []= $block;
+
+ $block['last'] = true;
+ $block['lines'] = array($matches[1]);
+
+ unset($block['first']);
+ unset($block['interrupted']);
+
+ continue 2;
+ }
+
+ if ( ! isset($block['interrupted']))
+ {
+ $line = preg_replace('/^[ ]{0,'.$block['baseline'].'}/', '', $line);
+
+ $block['lines'] []= $line;
+
+ continue 2;
+ }
+ elseif ($line[0] === ' ')
+ {
+ $block['lines'] []= '';
+
+ $line = preg_replace('/^[ ]{0,'.$block['baseline'].'}/', '', $line);
+
+ $block['lines'] []= $line;
+
+ unset($block['interrupted']);
+
+ continue 2;
+ }
+
+ break;
+ }
+
+ # indentation sensitive types
+
+ switch ($line[0])
+ {
+ case ' ':
+
+ # code
+
+ if ($indentation >= 4)
+ {
+ $code_line = substr($line, 4);
+
+ if ($block['type'] === 'code')
+ {
+ if (isset($block['interrupted']))
+ {
+ $block['text'] .= "\n";
+
+ unset($block['interrupted']);
+ }
+
+ $block['text'] .= "\n".$code_line;
+ }
+ else
+ {
+ $blocks []= $block;
+
+ $block = array(
+ 'type' => 'code',
+ 'text' => $code_line,
+ );
+ }
+
+ continue 2;
+ }
+
+ break;
+
+ case '#':
+
+ # atx heading (#)
+
+ if (isset($line[1]))
+ {
+ $blocks []= $block;
+
+ $level = 1;
+
+ while (isset($line[$level]) and $line[$level] === '#')
+ {
+ $level++;
+ }
+
+ $block = array(
+ 'type' => 'heading',
+ 'text' => trim($line, '# '),
+ 'level' => $level,
+ );
+
+ continue 2;
+ }
+
+ break;
+
+ case '-':
+ case '=':
+
+ # setext heading (===)
+
+ if ($block['type'] === 'paragraph' and isset($block['interrupted']) === false)
+ {
+ $chopped_line = chop($line);
+
+ $i = 1;
+
+ while (isset($chopped_line[$i]))
+ {
+ if ($chopped_line[$i] !== $line[0])
+ {
+ break 2;
+ }
+
+ $i++;
+ }
+
+ $block['type'] = 'heading';
+
+ $block['level'] = $line[0] === '-' ? 2 : 1;
+
+ continue 2;
+ }
+
+ break;
+ }
+
+ # indentation insensitive types
+
+ switch ($outdented_line[0])
+ {
+ case '<':
+
+ $position = strpos($outdented_line, '>');
+
+ if ($position > 1)
+ {
+ $substring = substr($outdented_line, 1, $position - 1);
+
+ $substring = chop($substring);
+
+ if (substr($substring, -1) === '/')
+ {
+ $is_self_closing = true;
+
+ $substring = substr($substring, 0, -1);
+ }
+
+ $position = strpos($substring, ' ');
+
+ if ($position)
+ {
+ $name = substr($substring, 0, $position);
+ }
+ else
+ {
+ $name = $substring;
+ }
+
+ if ( ! ctype_alpha($name))
+ {
+ break;
+ }
+
+ if (in_array($name, self::$text_level_elements))
+ {
+ break;
+ }
+
+ $blocks []= $block;
+
+ if (isset($is_self_closing))
+ {
+ $block = array(
+ 'type' => 'self-closing tag',
+ 'text' => $outdented_line,
+ );
+
+ unset($is_self_closing);
+
+ continue 2;
+ }
+
+ $block = array(
+ 'type' => 'markup',
+ 'text' => $outdented_line,
+ 'start' => '<'.$name.'>',
+ 'end' => '</'.$name.'>',
+ 'depth' => 0,
+ );
+
+ if (strpos($outdented_line, $block['end']))
+ {
+ $block['closed'] = true;
+ }
+
+ continue 2;
+ }
+
+ break;
+
+ case '>':
+
+ # quote
+
+ if (preg_match('/^>[ ]?(.*)/', $outdented_line, $matches))
+ {
+ $blocks []= $block;
+
+ $block = array(
+ 'type' => 'quote',
+ 'lines' => array(
+ $matches[1],
+ ),
+ );
+
+ continue 2;
+ }
+
+ break;
+
+ case '[':
+
+ # reference
+
+ $position = strpos($outdented_line, ']:');
+
+ if ($position)
+ {
+ $reference = array();
+
+ $label = substr($outdented_line, 1, $position - 1);
+ $label = strtolower($label);
+
+ $substring = substr($outdented_line, $position + 2);
+ $substring = trim($substring);
+
+ if ($substring === '')
+ {
+ break;
+ }
+
+ if ($substring[0] === '<')
+ {
+ $position = strpos($substring, '>');
+
+ if ($position === false)
+ {
+ break;
+ }
+
+ $reference['»'] = substr($substring, 1, $position - 1);
+
+ $substring = substr($substring, $position + 1);
+ }
+ else
+ {
+ $position = strpos($substring, ' ');
+
+ if ($position === false)
+ {
+ $reference['»'] = $substring;
+
+ $substring = false;
+ }
+ else
+ {
+ $reference['»'] = substr($substring, 0, $position);
+
+ $substring = substr($substring, $position + 1);
+ }
+ }
+
+ if ($substring !== false)
+ {
+ if ($substring[0] !== '"' and $substring[0] !== "'" and $substring[0] !== '(')
+ {
+ break;
+ }
+
+ $last_char = substr($substring, -1);
+
+ if ($last_char !== '"' and $last_char !== "'" and $last_char !== ')')
+ {
+ break;
+ }
+
+ $reference['#'] = substr($substring, 1, -1);
+ }
+
+ $this->reference_map[$label] = $reference;
+
+ continue 2;
+ }
+
+ break;
+
+ case '`':
+ case '~':
+
+ # fenced code block
+
+ if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\S+)?[ ]*$/', $outdented_line, $matches))
+ {
+ $blocks []= $block;
+
+ $block = array(
+ 'type' => 'fenced',
+ 'text' => '',
+ 'fence' => $matches[1],
+ );
+
+ if (isset($matches[2]))
+ {
+ $block['language'] = $matches[2];
+ }
+
+ continue 2;
+ }
+
+ break;
+
+ case '*':
+ case '+':
+ case '-':
+ case '_':
+
+ # hr
+
+ if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $outdented_line))
+ {
+ $blocks []= $block;
+
+ $block = array(
+ 'type' => 'rule',
+ );
+
+ continue 2;
+ }
+
+ # li
+
+ if (preg_match('/^([*+-][ ]+)(.*)/', $outdented_line, $matches))
+ {
+ $blocks []= $block;
+
+ $baseline = $indentation + strlen($matches[1]);
+
+ $block = array(
+ 'type' => 'li',
+ 'indentation' => $indentation,
+ 'baseline' => $baseline,
+ 'marker' => '[*+-]',
+ 'first' => true,
+ 'last' => true,
+ 'lines' => array(),
+ );
+
+ $block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[2]);
+
+ continue 2;
+ }
+ }
+
+ # li
+
+ if ($outdented_line[0] <= '9' and preg_match('/^(\d+[.][ ]+)(.*)/', $outdented_line, $matches))
+ {
+ $blocks []= $block;
+
+ $baseline = $indentation + strlen($matches[1]);
+
+ $block = array(
+ 'type' => 'li',
+ 'indentation' => $indentation,
+ 'baseline' => $baseline,
+ 'marker' => '\d+[.]',
+ 'first' => true,
+ 'last' => true,
+ 'ordered' => true,
+ 'lines' => array(),
+ );
+
+ $block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[2]);
+
+ continue;
+ }
+
+ # paragraph
+
+ if ($block['type'] === 'paragraph')
+ {
+ if (isset($block['interrupted']))
+ {
+ $blocks []= $block;
+
+ $block['text'] = $line;
+
+ unset($block['interrupted']);
+ }
+ else
+ {
+ if ($this->breaks_enabled)
+ {
+ $block['text'] .= ' ';
+ }
+
+ $block['text'] .= "\n".$line;
+ }
+ }
+ else
+ {
+ $blocks []= $block;
+
+ $block = array(
+ 'type' => 'paragraph',
+ 'text' => $line,
+ );
+ }
+ }
+
+ $blocks []= $block;
+
+ unset($blocks[0]);
+
+ # $blocks » HTML
+
+ $markup = '';
+
+ foreach ($blocks as $block)
+ {
+ switch ($block['type'])
+ {
+ case 'paragraph':
+
+ $text = $this->parse_span_elements($block['text']);
+
+ if ($context === 'li' and $markup === '')
+ {
+ if (isset($block['interrupted']))
+ {
+ $markup .= "\n".'<p>'.$text.'</p>'."\n";
+ }
+ else
+ {
+ $markup .= $text;
+
+ if (isset($blocks[2]))
+ {
+ $markup .= "\n";
+ }
+ }
+ }
+ else
+ {
+ $markup .= '<p>'.$text.'</p>'."\n";
+ }
+
+ break;
+
+ case 'quote':
+
+ $text = $this->parse_block_elements($block['lines']);
+
+ $markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
+
+ break;
+
+ case 'code':
+
+ $text = htmlspecialchars($block['text'], ENT_NOQUOTES, 'UTF-8');
+
+ $markup .= '<pre><code>'.$text.'</code></pre>'."\n";
+
+ break;
+
+ case 'fenced':
+
+ $text = htmlspecialchars($block['text'], ENT_NOQUOTES, 'UTF-8');
+
+ $markup .= '<pre><code';
+
+ if (isset($block['language']))
+ {
+ $markup .= ' class="language-'.$block['language'].'"';
+ }
+
+ $markup .= '>'.$text.'</code></pre>'."\n";
+
+ break;
+
+ case 'heading':
+
+ $text = $this->parse_span_elements($block['text']);
+
+ $markup .= '<h'.$block['level'].'>'.$text.'</h'.$block['level'].'>'."\n";
+
+ break;
+
+ case 'rule':
+
+ $markup .= '<hr />'."\n";
+
+ break;
+
+ case 'li':
+
+ if (isset($block['first']))
+ {
+ $type = isset($block['ordered']) ? 'ol' : 'ul';
+
+ $markup .= '<'.$type.'>'."\n";
+ }
+
+ if (isset($block['interrupted']) and ! isset($block['last']))
+ {
+ $block['lines'] []= '';
+ }
+
+ $text = $this->parse_block_elements($block['lines'], 'li');
+
+ $markup .= '<li>'.$text.'</li>'."\n";
+
+ if (isset($block['last']))
+ {
+ $type = isset($block['ordered']) ? 'ol' : 'ul';
+
+ $markup .= '</'.$type.'>'."\n";
+ }
+
+ break;
+
+ case 'markup':
+
+ $markup .= $block['text']."\n";
+
+ break;
+
+ default:
+
+ $markup .= $block['text']."\n";
+ }
+ }
+
+ return $markup;
+ }
+
+ private function parse_span_elements($text, $markers = array(" \n", '![', '&', '*', '<', '[', '\\', '_', '`', 'http', '~~'))
+ {
+ if (isset($text[1]) === false or $markers === array())
+ {
+ return $text;
+ }
+
+ # ~
+
+ $markup = '';
+
+ while ($markers)
+ {
+ $closest_marker = null;
+ $closest_marker_index = 0;
+ $closest_marker_position = null;
+
+ foreach ($markers as $index => $marker)
+ {
+ $marker_position = strpos($text, $marker);
+
+ if ($marker_position === false)
+ {
+ unset($markers[$index]);
+
+ continue;
+ }
+
+ if ($closest_marker === null or $marker_position < $closest_marker_position)
+ {
+ $closest_marker = $marker;
+ $closest_marker_index = $index;
+ $closest_marker_position = $marker_position;
+ }
+ }
+
+ # ~
+
+ if ($closest_marker === null or isset($text[$closest_marker_position + 1]) === false)
+ {
+ $markup .= $text;
+
+ break;
+ }
+ else
+ {
+ $markup .= substr($text, 0, $closest_marker_position);
+ }
+
+ $text = substr($text, $closest_marker_position);
+
+ # ~
+
+ unset($markers[$closest_marker_index]);
+
+ # ~
+
+ switch ($closest_marker)
+ {
+ case " \n":
+
+ $markup .= '<br />'."\n";
+
+ $offset = 3;
+
+ break;
+
+ case '![':
+ case '[':
+
+ if (strpos($text, ']') and preg_match('/\[((?:[^][]|(?R))*)\]/', $text, $matches))
+ {
+ $element = array(
+ '!' => $text[0] === '!',
+ 'a' => $matches[1],
+ );
+
+ $offset = strlen($matches[0]);
+
+ if ($element['!'])
+ {
+ $offset++;
+ }
+
+ $remaining_text = substr($text, $offset);
+
+ if ($remaining_text[0] === '(' and preg_match('/\([ ]*(.*?)(?:[ ]+[\'"](.+?)[\'"])?[ ]*\)/', $remaining_text, $matches))
+ {
+ $element['»'] = $matches[1];
+
+ if (isset($matches[2]))
+ {
+ $element['#'] = $matches[2];
+ }
+
+ $offset += strlen($matches[0]);
+ }
+ elseif ($this->reference_map)
+ {
+ $reference = $element['a'];
+
+ if (preg_match('/^\s*\[(.*?)\]/', $remaining_text, $matches))
+ {
+ $reference = $matches[1] ? $matches[1] : $element['a'];
+
+ $offset += strlen($matches[0]);
+ }
+
+ $reference = strtolower($reference);
+
+ if (isset($this->reference_map[$reference]))
+ {
+ $element['»'] = $this->reference_map[$reference]['»'];
+
+ if (isset($this->reference_map[$reference]['#']))
+ {
+ $element['#'] = $this->reference_map[$reference]['#'];
+ }
+ }
+ else
+ {
+ unset($element);
+ }
+ }
+ else
+ {
+ unset($element);
+ }
+ }
+
+ if (isset($element))
+ {
+ $element['»'] = str_replace('&', '&amp;', $element['»']);
+ $element['»'] = str_replace('<', '&lt;', $element['»']);
+
+ if ($element['!'])
+ {
+ $markup .= '<img alt="'.$element['a'].'" src="'.$element['»'].'"';
+
+ if (isset($element['#']))
+ {
+ $markup .= ' title="'.$element['#'].'"';
+ }
+
+ $markup .= ' />';
+ }
+ else
+ {
+ $element['a'] = $this->parse_span_elements($element['a'], $markers);
+
+ $markup .= '<a href="'.$element['»'].'"';
+
+ if (isset($element['#']))
+ {
+ $markup .= ' title="'.$element['#'].'"';
+ }
+
+ $markup .= '>'.$element['a'].'</a>';
+ }
+
+ unset($element);
+ }
+ else
+ {
+ $markup .= $closest_marker;
+
+ $offset = $closest_marker === '![' ? 2 : 1;
+ }
+
+ break;
+
+ case '&':
+
+ if (preg_match('/^&#?\w+;/', $text, $matches))
+ {
+ $markup .= $matches[0];
+
+ $offset = strlen($matches[0]);
+ }
+ else
+ {
+ $markup .= '&amp;';
+
+ $offset = 1;
+ }
+
+ break;
+
+ case '*':
+ case '_':
+
+ if ($text[1] === $closest_marker and preg_match(self::$strong_regex[$closest_marker], $text, $matches))
+ {
+ $markers[] = $closest_marker;
+ $matches[1] = $this->parse_span_elements($matches[1], $markers);
+
+ $markup .= '<strong>'.$matches[1].'</strong>';
+ }
+ elseif (preg_match(self::$em_regex[$closest_marker], $text, $matches))
+ {
+ $markers[] = $closest_marker;
+ $matches[1] = $this->parse_span_elements($matches[1], $markers);
+
+ $markup .= '<em>'.$matches[1].'</em>';
+ }
+
+ if (isset($matches) and $matches)
+ {
+ $offset = strlen($matches[0]);
+ }
+ else
+ {
+ $markup .= $closest_marker;
+
+ $offset = 1;
+ }
+
+ break;
+
+ case '<':
+
+ if (strpos($text, '>') !== false)
+ {
+ if ($text[1] === 'h' and preg_match('/^<(https?:[\/]{2}[^\s]+?)>/i', $text, $matches))
+ {
+ $element_url = $matches[1];
+ $element_url = str_replace('&', '&amp;', $element_url);
+ $element_url = str_replace('<', '&lt;', $element_url);
+
+ $markup .= '<a href="'.$element_url.'">'.$element_url.'</a>';
+
+ $offset = strlen($matches[0]);
+ }
+ elseif (strpos($text, '@') > 1 and preg_match('/<(\S+?@\S+?)>/', $text, $matches))
+ {
+ $markup .= '<a href="mailto:'.$matches[1].'">'.$matches[1].'</a>';
+
+ $offset = strlen($matches[0]);
+ }
+ elseif (preg_match('/^<\/?\w.*?>/', $text, $matches))
+ {
+ $markup .= $matches[0];
+
+ $offset = strlen($matches[0]);
+ }
+ else
+ {
+ $markup .= '&lt;';
+
+ $offset = 1;
+ }
+ }
+ else
+ {
+ $markup .= '&lt;';
+
+ $offset = 1;
+ }
+
+ break;
+
+ case '\\':
+
+ if (in_array($text[1], self::$special_characters))
+ {
+ $markup .= $text[1];
+
+ $offset = 2;
+ }
+ else
+ {
+ $markup .= '\\';
+
+ $offset = 1;
+ }
+
+ break;
+
+ case '`':
+
+ if (preg_match('/^(`+)[ ]*(.+?)[ ]*(?<!`)\1(?!`)/', $text, $matches))
+ {
+ $element_text = $matches[2];
+ $element_text = htmlspecialchars($element_text, ENT_NOQUOTES, 'UTF-8');
+
+ $markup .= '<code>'.$element_text.'</code>';
+
+ $offset = strlen($matches[0]);
+ }
+ else
+ {
+ $markup .= '`';
+
+ $offset = 1;
+ }
+
+ break;
+
+ case 'http':
+
+ if (preg_match('/^https?:[\/]{2}[^\s]+\b\/*/ui', $text, $matches))
+ {
+ $element_url = $matches[0];
+ $element_url = str_replace('&', '&amp;', $element_url);
+ $element_url = str_replace('<', '&lt;', $element_url);
+
+ $markup .= '<a href="'.$element_url.'">'.$element_url.'</a>';
+
+ $offset = strlen($matches[0]);
+ }
+ else
+ {
+ $markup .= 'http';
+
+ $offset = 4;
+ }
+
+ break;
+
+ case '~~':
+
+ if (preg_match('/^~~(?=\S)(.+?)(?<=\S)~~/', $text, $matches))
+ {
+ $matches[1] = $this->parse_span_elements($matches[1], $markers);
+
+ $markup .= '<del>'.$matches[1].'</del>';
+
+ $offset = strlen($matches[0]);
+ }
+ else
+ {
+ $markup .= '~~';
+
+ $offset = 2;
+ }
+
+ break;
+ }
+
+ if (isset($offset))
+ {
+ $text = substr($text, $offset);
+ }
+
+ $markers[$closest_marker_index] = $closest_marker;
+ }
+
+ return $markup;
+ }
+
+ #
+ # Fields
+ #
+
+ private $reference_map = array();
+
+ #
+ # Read-only
+
+ private static $strong_regex = array(
+ '*' => '/^[*]{2}((?:[^*]|[*][^*]*[*])+?)[*]{2}(?![*])/s',
+ '_' => '/^__((?:[^_]|_[^_]*_)+?)__(?!_)/us',
+ );
+
+ private static $em_regex = array(
+ '*' => '/^[*]((?:[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
+ '_' => '/^_((?:[^_]|__[^_]*__)+?)_(?!_)\b/us',
+ );
+
+ private static $special_characters = array(
+ '\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!',
+ );
+
+ private static $text_level_elements = array(
+ 'a', 'br', 'bdo', 'abbr', 'blink', 'nextid', 'acronym', 'basefont',
+ 'b', 'em', 'big', 'cite', 'small', 'spacer', 'listing',
+ 'i', 'rp', 'sub', 'code', 'strike', 'marquee',
+ 'q', 'rt', 'sup', 'font', 'strong',
+ 's', 'tt', 'var', 'mark',
+ 'u', 'xm', 'wbr', 'nobr',
+ 'ruby',
+ 'span',
+ 'time',
+ );
+}