From 43087d637035b15b9a2c1706c6f021b896d8cb76 Mon Sep 17 00:00:00 2001 From: joyqi Date: Mon, 25 Jan 2016 16:21:04 +0800 Subject: [PATCH] Replace the markdown parse engine with HyperDown --- var/HyperDown.php | 1134 +++++++++++ var/Markdown.php | 4 +- var/MarkdownExtraExtended.php | 3302 --------------------------------- 3 files changed, 1136 insertions(+), 3304 deletions(-) create mode 100644 var/HyperDown.php delete mode 100644 var/MarkdownExtraExtended.php diff --git a/var/HyperDown.php b/var/HyperDown.php new file mode 100644 index 00000000..337a6494 --- /dev/null +++ b/var/HyperDown.php @@ -0,0 +1,1134 @@ + + * @license BSD License + */ +class HyperDown +{ + /** + * _whiteList + * + * @var string + */ + private $_commonWhiteList = 'kbd|b|i|strong|em|sup|sub|br|code|del|a|hr|small'; + + /** + * _specialWhiteList + * + * @var mixed + * @access private + */ + private $_specialWhiteList = [ + 'table' => 'table|tbody|thead|tfoot|tr|td|th' + ]; + + /** + * _footnotes + * + * @var array + */ + private $_footnotes; + + /** + * _blocks + * + * @var array + */ + private $_blocks; + + /** + * _current + * + * @var string + */ + private $_current; + + /** + * _pos + * + * @var int + */ + private $_pos; + + /** + * _definitions + * + * @var array + */ + private $_definitions; + + /** + * @var array + */ + private $_hooks = []; + + /** + * @var array + */ + private $_holders; + + /** + * @var string + */ + private $_uniqid; + + /** + * @var int + */ + private $_id; + + /** + * makeHtml + * + * @param mixed $text + * @return string + */ + public function makeHtml($text) + { + $this->_footnotes = []; + $this->_blocks = []; + $this->_current = 'normal'; + $this->_pos = -1; + $this->_definitions = []; + $this->_holders = []; + $this->_uniqid = md5(uniqid()); + $this->_id = 0; + + $text = $this->initText($text); + $html = $this->parse($text); + return $this->makeFootnotes($html); + } + + /** + * @param $type + * @param $callback + */ + public function hook($type, $callback) + { + $this->_hooks[$type][] = $callback; + } + + /** + * @param $str + * @return string + */ + public function makeHolder($str) + { + $key = "|\r" . $this->_uniqid . $this->_id . "\r|"; + $this->_id ++; + $this->_holders[$key] = $str; + + return $key; + } + + /** + * @param $text + * @return mixed + */ + private function initText($text) + { + $text = str_replace(["\t", "\r"], [' ', ''], $text); + return $text; + } + + /** + * @param $html + * @return string + */ + private function makeFootnotes($html) + { + if (count($this->_footnotes) > 0) { + $html .= '
    '; + $index = 1; + + while ($val = array_shift($this->_footnotes)) { + if (is_string($val)) { + $val .= " ↩"; + } else { + $val[count($val) - 1] .= " ↩"; + $val = count($val) > 1 ? $this->parse(implode("\n", $val)) : $this->parseInline($val[0]); + } + + $html .= "
  1. {$val}
    2. "; + $index ++; + } + + $html .= '
'; + } + + return $html; + } + + /** + * parse + * + * @param string $text + * @return string + */ + private function parse($text) + { + $blocks = $this->parseBlock($text, $lines); + $html = ''; + + foreach ($blocks as $block) { + list ($type, $start, $end, $value) = $block; + $extract = array_slice($lines, $start, $end - $start + 1); + $method = 'parse' . ucfirst($type); + + $extract = $this->call('before' . ucfirst($method), $extract, $value); + $result = $this->{$method}($extract, $value); + $result = $this->call('after' . ucfirst($method), $result, $value); + + $html .= $result; + } + + return $html; + } + + /** + * @param $type + * @param $value + * @return mixed + */ + private function call($type, $value) + { + if (empty($this->_hooks[$type])) { + return $value; + } + + $args = func_get_args(); + $args = array_slice($args, 1); + + foreach ($this->_hooks[$type] as $callback) { + $value = call_user_func_array($callback, $args); + $args[0] = $value; + } + + return $value; + } + + /** + * @param $text + * @param $clearHolders + * @return string + */ + private function releaseHolder($text, $clearHolders = true) + { + $deep = 0; + while (strpos($text, "|\r") !== false && $deep < 10) { + $text = str_replace(array_keys($this->_holders), array_values($this->_holders), $text); + $deep ++; + } + + if ($clearHolders) { + $this->_holders = []; + } + + return $text; + } + + /** + * parseInline + * + * @param string $text + * @param string $whiteList + * @param bool $clearHolders + * @return string + */ + private function parseInline($text, $whiteList = '', $clearHolders = true) + { + $text = $this->call('beforeParseInline', $text); + + // code + $text = preg_replace_callback("/(^|[^\\\])(`+)(.+?)\\2/", function ($matches) { + return $matches[1] . $this->makeHolder('' . htmlspecialchars($matches[3]) . ''); + }, $text); + + // link + $text = preg_replace_callback("/<(https?:\/\/.+)>/i", function ($matches) { + return $this->makeHolder("{$matches[1]}"); + }, $text); + + // encode unsafe tags + $text = preg_replace_callback("/<(\/?)([a-z0-9-]+)(\s+[^>]*)?>/i", function ($matches) use ($whiteList) { + if (stripos($this->_commonWhiteList . '|' . $whiteList, $matches[2]) !== false) { + return $this->makeHolder($matches[0]); + } else { + return htmlspecialchars($matches[0]); + } + }, $text); + + $text = str_replace(['<', '>'], ['<', '>'], $text); + + // footnote + $text = preg_replace_callback("/\[\^((?:[^\]]|\\]|\\[)+?)\]/", function ($matches) { + $id = array_search($matches[1], $this->_footnotes); + + if (false === $id) { + $id = count($this->_footnotes) + 1; + $this->_footnotes[$id] = $this->parseInline($matches[1], '', false); + } + + return $this->makeHolder("{$id}"); + }, $text); + + // image + $text = preg_replace_callback("/!\[((?:[^\]]|\\]|\\[)*?)\]\(((?:[^\)]|\\)|\\()+?)\)/", function ($matches) { + $escaped = $this->escapeBracket($matches[1]); + $url = $this->escapeBracket($matches[2]); + return $this->makeHolder("\"{$escaped}\""); + }, $text); + + $text = preg_replace_callback("/!\[((?:[^\]]|\\]|\\[)*?)\]\[((?:[^\]]|\\]|\\[)+?)\]/", function ($matches) { + $escaped = $this->escapeBracket($matches[1]); + + $result = isset($this->_definitions[$matches[2]]) ? + "_definitions[$matches[2]]}\" alt=\"{$escaped}\" title=\"{$escaped}\">" + : $escaped; + + return $this->makeHolder($result); + }, $text); + + // link + $text = preg_replace_callback("/\[((?:[^\]]|\\]|\\[)+?)\]\(((?:[^\)]|\\)|\\()+?)\)/", function ($matches) { + $escaped = $this->parseInline($this->escapeBracket($matches[1]), '', false); + $url = $this->escapeBracket($matches[2]); + return $this->makeHolder("{$escaped}"); + }, $text); + + $text = preg_replace_callback("/\[((?:[^\]]|\\]|\\[)+?)\]\[((?:[^\]]|\\]|\\[)+?)\]/", function ($matches) { + $escaped = $this->parseInline($this->escapeBracket($matches[1]), '', false); + + $result = isset($this->_definitions[$matches[2]]) ? + "_definitions[$matches[2]]}\">{$escaped}" + : $escaped; + + return $this->makeHolder($result); + }, $text); + + // escape + $text = preg_replace_callback("/\\\(`|\*|_|~)/", function ($matches) { + return $this->makeHolder(htmlspecialchars($matches[1])); + }, $text); + + // strong and em and some fuck + $text = $this->parseInlineCallback($text); + $text = preg_replace("/<([_a-z0-9-\.\+]+@[^@]+\.[a-z]{2,})>/i", "\\1", $text); + + // autolink url + $text = preg_replace("/(^|[^\"])((http|https|ftp|mailto):[_a-z0-9-\.\/%#@\?\+=~\|\,&\(\)]+)($|[^\"])/i", + "\\1\\2\\4", $text); + + $text = $this->call('afterParseInlineBeforeRelease', $text); + $text = $this->releaseHolder($text, $clearHolders); + + $text = $this->call('afterParseInline', $text); + + return $text; + } + + /** + * @param $text + * @return mixed + */ + private function parseInlineCallback($text) + { + $text = preg_replace_callback("/(\*{3})(.+?)\\1/", function ($matches) { + return '' . $this->parseInlineCallback($matches[2]) . ''; + }, $text); + + $text = preg_replace_callback("/(\*{2})(.+?)\\1/", function ($matches) { + return '' . $this->parseInlineCallback($matches[2]) . ''; + }, $text); + + $text = preg_replace_callback("/(\*)(.+?)\\1/", function ($matches) { + return '' . $this->parseInlineCallback($matches[2]) . ''; + }, $text); + + $text = preg_replace_callback("/(\s+|^)(_{3})(.+?)\\2(\s+|$)/", function ($matches) { + return $matches[1] . '' . $this->parseInlineCallback($matches[3]) . '' . $matches[4]; + }, $text); + + $text = preg_replace_callback("/(\s+|^)(_{2})(.+?)\\2(\s+|$)/", function ($matches) { + return $matches[1] . '' . $this->parseInlineCallback($matches[3]) . '' . $matches[4]; + }, $text); + + $text = preg_replace_callback("/(\s+|^)(_)(.+?)\\2(\s+|$)/", function ($matches) { + return $matches[1] . '' . $this->parseInlineCallback($matches[3]) . '' . $matches[4]; + }, $text); + + $text = preg_replace_callback("/(~{2})(.+?)\\1/", function ($matches) { + return '' . $this->parseInlineCallback($matches[2]) . ''; + }, $text); + + return $text; + } + + /** + * parseBlock + * + * @param string $text + * @param array $lines + * @return array + */ + private function parseBlock($text, &$lines) + { + $lines = explode("\n", $text); + $this->_blocks = []; + $this->_current = 'normal'; + $this->_pos = -1; + $special = implode("|", array_keys($this->_specialWhiteList)); + $emptyCount = 0; + + // analyze by line + foreach ($lines as $key => $line) { + // code block is special + if (preg_match("/^(\s*)(~|`){3,}([^`~]*)$/i", $line, $matches)) { + if ($this->isBlock('code')) { + $block = $this->getBlock(); + $isAfterList = $block[3][2]; + + if ($isAfterList) { + $this->combineBlock() + ->setBlock($key); + } else { + $this->setBlock($key) + ->endBlock(); + } + } else { + $isAfterList = false; + + if ($this->isBlock('list')) { + $block = $this->getBlock(); + $space = $block[3]; + + $isAfterList = ($space > 0 && strlen($matches[1]) >= $space) + || strlen($matches[1]) > $space; + } + + $this->startBlock('code', $key, [$matches[1], $matches[3], $isAfterList]); + } + + continue; + } else if ($this->isBlock('code')) { + $this->setBlock($key); + continue; + } + + // pre block + if (preg_match("/^ {4}/", $line)) { + $emptyCount = 0; + + if ($this->isBlock('pre') || $this->isBlock('list')) { + $this->setBlock($key); + continue; + } else if ($this->isBlock('normal')) { + $this->startBlock('pre', $key); + continue; + } + } + + // html block is special too + if (preg_match("/^\s*<({$special})(\s+[^>]*)?>/i", $line, $matches)) { + $tag = strtolower($matches[1]); + if (!$this->isBlock('html', $tag) && !$this->isBlock('pre')) { + $this->startBlock('html', $key, $tag); + } + + continue; + } else if (preg_match("/<\/({$special})>\s*$/i", $line, $matches)) { + $tag = strtolower($matches[1]); + + if ($this->isBlock('html', $tag)) { + $this->setBlock($key) + ->endBlock(); + } + + continue; + } else if ($this->isBlock('html')) { + $this->setBlock($key); + continue; + } + + switch (true) { + // list + case preg_match("/^(\s*)((?:[0-9a-z]+\.)|\-|\+|\*)\s+/", $line, $matches): + $space = strlen($matches[1]); + $emptyCount = 0; + + // opened + if ($this->isBlock('list')) { + $this->setBlock($key, $space); + } else { + $this->startBlock('list', $key, $space); + } + break; + + // footnote + case preg_match("/^\[\^((?:[^\]]|\\]|\\[)+?)\]:/", $line, $matches): + $space = strlen($matches[0]) - 1; + $this->startBlock('footnote', $key, [$space, $matches[1]]); + break; + + // definition + case preg_match("/^\s*\[((?:[^\]]|\\]|\\[)+?)\]:\s*(.+)$/", $line, $matches): + $this->_definitions[$matches[1]] = $matches[2]; + $this->startBlock('definition', $key) + ->endBlock(); + break; + + // block quote + case preg_match("/^\s*>/", $line): + if ($this->isBlock('quote')) { + $this->setBlock($key); + } else { + $this->startBlock('quote', $key); + } + break; + + // table + case preg_match("/^((?:(?:(?:[ :]*\-[ :]*)+(?:\||\+))|(?:(?:\||\+)(?:[ :]*\-[ :]*)+)|(?:(?:[ :]*\-[ :]*)+(?:\||\+)(?:[ :]*\-[ :]*)+))+)$/", $line, $matches): + if ($this->isBlock('normal')) { + $block = $this->getBlock(); + $head = false; + + if (empty($block) || + $block[0] != 'normal' || + preg_match("/^\s*$/", $lines[$block[2]])) { + $this->startBlock('table', $key); + } else { + $head = true; + $this->backBlock(1, 'table'); + } + + if ($matches[1][0] == '|') { + $matches[1] = substr($matches[1], 1); + + if ($matches[1][strlen($matches[1]) - 1] == '|') { + $matches[1] = substr($matches[1], 0, -1); + } + } + + $rows = preg_split("/(\+|\|)/", $matches[1]); + $aligns = []; + foreach ($rows as $row) { + $align = 'none'; + + if (preg_match("/^\s*(:?)\-+(:?)\s*$/", $row, $matches)) { + if (!empty($matches[1]) && !empty($matches[2])) { + $align = 'center'; + } else if (!empty($matches[1])) { + $align = 'left'; + } else if (!empty($matches[2])) { + $align = 'right'; + } + } + + $aligns[] = $align; + } + + $this->setBlock($key, [$head, $aligns]); + } + break; + + // single heading + case preg_match("/^(#+)(.*)$/", $line, $matches): + $num = min(strlen($matches[1]), 6); + $this->startBlock('sh', $key, $num) + ->endBlock(); + break; + + // multi heading + case preg_match("/^\s*((=|-){2,})\s*$/", $line, $matches) + && ($this->getBlock() && $this->getBlock()[0] == "normal" && !preg_match("/^\s*$/", $lines[$this->getBlock()[2]])): // check if last line isn't empty + if ($this->isBlock('normal')) { + $this->backBlock(1, 'mh', $matches[1][0] == '=' ? 1 : 2) + ->setBlock($key) + ->endBlock(); + } else { + $this->startBlock('normal', $key); + } + break; + + // hr + case preg_match("/^[-\*]{3,}\s*$/", $line): + $this->startBlock('hr', $key) + ->endBlock(); + break; + + // normal + default: + if ($this->isBlock('list')) { + if (preg_match("/^(\s*)/", $line)) { // empty line + if ($emptyCount > 0) { + $this->startBlock('normal', $key); + } else { + $this->setBlock($key); + } + + $emptyCount ++; + } else if ($emptyCount == 0) { + $this->setBlock($key); + } else { + $this->startBlock('normal', $key); + } + } else if ($this->isBlock('footnote')) { + preg_match("/^(\s*)/", $line, $matches); + + if (strlen($matches[1]) >= $this->getBlock()[3][0]) { + $this->setBlock($key); + } else { + $this->startBlock('normal', $key); + } + } else if ($this->isBlock('table')) { + if (false !== strpos($line, '|')) { + $this->setBlock($key); + } else { + $this->startBlock('normal', $key); + } + } else if ($this->isBlock('pre')) { + if (preg_match("/^\s*$/", $line)) { + if ($emptyCount > 0) { + $this->startBlock('normal', $key); + } else { + $this->setBlock($key); + } + + $emptyCount ++; + } else { + $this->startBlock('normal', $key); + } + } else if ($this->isBlock('quote')) { + if (preg_match("/^(\s*)/", $line)) { // empty line + if ($emptyCount > 0) { + $this->startBlock('normal', $key); + } else { + $this->setBlock($key); + } + + $emptyCount ++; + } else if ($emptyCount == 0) { + $this->setBlock($key); + } else { + $this->startBlock('normal', $key); + } + } else { + $block = $this->getBlock(); + + if (empty($block) || $block[0] != 'normal') { + $this->startBlock('normal', $key); + } else { + $this->setBlock($key); + } + } + break; + } + } + + return $this->optimizeBlocks($this->_blocks, $lines); + } + + /** + * @param array $blocks + * @param array $lines + * @return array + */ + private function optimizeBlocks(array $blocks, array $lines) + { + $blocks = $this->call('beforeOptimizeBlocks', $blocks, $lines); + + foreach ($blocks as $key => &$block) { + $prevBlock = isset($blocks[$key - 1]) ? $blocks[$key - 1] : NULL; + $nextBlock = isset($blocks[$key + 1]) ? $blocks[$key + 1] : NULL; + + list ($type, $from, $to) = $block; + + if ('pre' == $type) { + $isEmpty = array_reduce($lines, function ($result, $line) { + return preg_match("/^\s*$/", $line) && $result; + }, true); + + if ($isEmpty) { + $block[0] = $type = 'normal'; + } + } + + if ('normal' == $type) { + // combine two blocks + $types = ['list', 'quote']; + + if ($from == $to && preg_match("/^\s*$/", $lines[$from]) + && !empty($prevBlock) && !empty($nextBlock)) { + if ($prevBlock[0] == $nextBlock[0] && in_array($prevBlock[0], $types)) { + // combine 3 blocks + $blocks[$key - 1] = [$prevBlock[0], $prevBlock[1], $nextBlock[2], NULL]; + array_splice($blocks, $key, 2); + } + } + } + } + + return $this->call('afterOptimizeBlocks', $blocks, $lines); + } + + /** + * parseCode + * + * @param array $lines + * @param array $parts + * @return string + */ + private function parseCode(array $lines, array $parts) + { + list ($blank, $lang) = $parts; + $lang = trim($lang); + $count = strlen($blank); + + if (!preg_match("/^[_a-z0-9-\+\#]+$/i", $lang)) { + $lang = NULL; + } + + $lines = array_map(function ($line) use ($count) { + return preg_replace("/^[ ]{{$count}}/", '', $line); + }, array_slice($lines, 1, -1)); + $str = implode("\n", $lines); + + return preg_match("/^\s*$/", $str) ? '' : + '
'
+            . htmlspecialchars(implode("\n", $lines)) . '
'; + } + + /** + * parsePre + * + * @param array $lines + * @return string + */ + private function parsePre(array $lines) + { + foreach ($lines as &$line) { + $line = htmlspecialchars(substr($line, 4)); + } + $str = implode("\n", $lines); + + return preg_match("/^\s*$/", $str) ? '' : '
' . $str . '
'; + } + + /** + * parseSh + * + * @param array $lines + * @param int $num + * @return string + */ + private function parseSh(array $lines, $num) + { + $line = $this->parseInline(trim($lines[0], '# ')); + return preg_match("/^\s*$/", $line) ? '' : "{$line}"; + } + + /** + * parseMh + * + * @param array $lines + * @param int $num + * @return string + */ + private function parseMh(array $lines, $num) + { + $line = $this->parseInline(trim($lines[0], '# ')); + return preg_match("/^\s*$/", $line) ? '' : "{$line}"; + } + + /** + * parseQuote + * + * @param array $lines + * @return string + */ + private function parseQuote(array $lines) + { + foreach ($lines as &$line) { + $line = preg_replace("/^\s*> ?/", '', $line); + } + $str = implode("\n", $lines); + + return preg_match("/^\s*$/", $str) ? '' : '
' . $this->parse($str) . '
'; + } + + /** + * parseList + * + * @param array $lines + * @return string + */ + private function parseList(array $lines) + { + $html = ''; + $minSpace = 99999; + $rows = []; + + // count levels + foreach ($lines as $key => $line) { + if (preg_match("/^(\s*)((?:[0-9a-z]+\.?)|\-|\+|\*)(\s+)(.*)$/", $line, $matches)) { + $space = strlen($matches[1]); + $type = false !== strpos('+-*', $matches[2]) ? 'ul' : 'ol'; + $minSpace = min($space, $minSpace); + + $rows[] = [$space, $type, $line, $matches[4]]; + } else { + $rows[] = $line; + } + } + + $found = false; + $secondMinSpace = 99999; + foreach ($rows as $row) { + if (is_array($row) && $row[0] != $minSpace) { + $secondMinSpace = min($secondMinSpace, $row[0]); + $found = true; + } + } + $secondMinSpace = $found ?: $minSpace; + + $lastType = ''; + $leftLines = []; + + foreach ($rows as $row) { + if (is_array($row)) { + list ($space, $type, $line, $text) = $row; + + if ($space != $minSpace) { + $leftLines[] = preg_replace("/^\s{" . $secondMinSpace . "}/", '', $line); + } else { + if (!empty($leftLines)) { + $html .= "
  • " . $this->parse(implode("\n", $leftLines)) . "
    • "; + } + + if ($lastType != $type) { + if (!empty($lastType)) { + $html .= ""; + } + + $html .= "<{$type}>"; + } + + $leftLines = [$text]; + $lastType = $type; + } + } else { + $leftLines[] = preg_replace("/^\s{" . $secondMinSpace . "}/", '', $row); + } + } + + if (!empty($leftLines)) { + $html .= "
  • " . $this->parse(implode("\n", $leftLines)) . "
    • "; + } + + return $html; + } + + /** + * @param array $lines + * @param array $value + * @return string + */ + private function parseTable(array $lines, array $value) + { + list ($head, $aligns) = $value; + $ignore = $head ? 1 : 0; + + $html = ''; + $body = NULL; + + foreach ($lines as $key => $line) { + if ($key == $ignore) { + $head = false; + $body = true; + continue; + } + + + $line = trim($line); + + if ($line[0] == '|') { + $line = substr($line, 1); + + if ($line[strlen($line) - 1] == '|') { + $line = substr($line, 0, -1); + } + } + + + $rows = array_map(function ($row) { + if (preg_match("/^\s+$/", $row)) { + return ' '; + } else { + return trim($row); + } + }, explode('|', $line)); + $columns = []; + $last = -1; + + foreach ($rows as $row) { + if (strlen($row) > 0) { + $last ++; + $columns[$last] = [isset($columns[$last]) ? $columns[$last][0] + 1 : 1, $row]; + } else if (isset($columns[$last])) { + $columns[$last][0] ++; + } else { + $columns[0] = [1, $row]; + } + } + + if ($head) { + $html .= ''; + } else if ($body) { + $html .= ''; + } + + $html .= ''; + + foreach ($columns as $key => $column) { + list ($num, $text) = $column; + $tag = $head ? 'th' : 'td'; + + $html .= "<{$tag}"; + if ($num > 1) { + $html .= " colspan=\"{$num}\""; + } + + if (isset($aligns[$key]) && $aligns[$key] != 'none') { + $html .= " align=\"{$aligns[$key]}\""; + } + + $html .= '>' . $this->parseInline($text) . ""; + } + + $html .= ''; + + if ($head) { + $html .= ''; + } else if ($body) { + $body = false; + } + } + + if ($body !== NULL) { + $html .= ''; + } + + $html .= '
    '; + return $html; + } + + /** + * parseHr + * + * @return string + */ + private function parseHr() + { + return '
    '; + } + + /** + * parseNormal + * + * @param array $lines + * @return string + */ + private function parseNormal(array $lines) + { + foreach ($lines as &$line) { + $line = $this->parseInline($line); + } + + $str = trim(implode("\n", $lines)); + $str = preg_replace("/(\n\s*){2,}/", "

    ", $str); + $str = preg_replace("/\n/", "
    ", $str); + + return preg_match("/^\s*$/", $str) ? '' : "

    {$str}

    "; + } + + /** + * parseFootnote + * + * @param array $lines + * @param array $value + * @return string + */ + private function parseFootnote(array $lines, array $value) + { + list($space, $note) = $value; + $index = array_search($note, $this->_footnotes); + + if (false !== $index) { + $lines[0] = preg_replace("/^\[\^((?:[^\]]|\\]|\\[)+?)\]:/", '', $lines[0]); + $this->_footnotes[$index] = $lines; + } + + return ''; + } + + /** + * parseDefine + * + * @return string + */ + private function parseDefinition() + { + return ''; + } + + /** + * parseHtml + * + * @param array $lines + * @param string $type + * @return string + */ + private function parseHtml(array $lines, $type) + { + foreach ($lines as &$line) { + $line = $this->parseInline($line, + isset($this->_specialWhiteList[$type]) ? $this->_specialWhiteList[$type] : ''); + } + + return implode("\n", $lines); + } + + /** + * @param $str + * @return mixed + */ + private function escapeBracket($str) + { + return str_replace(['\[', '\]', '\(', '\)'], ['[', ']', '(', ')'], $str); + } + + /** + * startBlock + * + * @param mixed $type + * @param mixed $start + * @param mixed $value + * @return $this + */ + private function startBlock($type, $start, $value = NULL) + { + $this->_pos ++; + $this->_current = $type; + + $this->_blocks[$this->_pos] = [$type, $start, $start, $value]; + + return $this; + } + + /** + * endBlock + * + * @return $this + */ + private function endBlock() + { + $this->_current = 'normal'; + return $this; + } + + /** + * isBlock + * + * @param mixed $type + * @param mixed $value + * @return bool + */ + private function isBlock($type, $value = NULL) + { + return $this->_current == $type + && (NULL === $value ? true : $this->_blocks[$this->_pos][3] == $value); + } + + /** + * getBlock + * + * @return array + */ + private function getBlock() + { + return isset($this->_blocks[$this->_pos]) ? $this->_blocks[$this->_pos] : NULL; + } + + /** + * setBlock + * + * @param mixed $to + * @param mixed $value + * @return $this + */ + private function setBlock($to = NULL, $value = NULL) + { + if (NULL !== $to) { + $this->_blocks[$this->_pos][2] = $to; + } + + if (NULL !== $value) { + $this->_blocks[$this->_pos][3] = $value; + } + + return $this; + } + + /** + * backBlock + * + * @param mixed $step + * @param mixed $type + * @param mixed $value + * @return $this + */ + private function backBlock($step, $type, $value = NULL) + { + if ($this->_pos < 0) { + return $this->startBlock($type, 0, $value); + } + + $last = $this->_blocks[$this->_pos][2]; + $this->_blocks[$this->_pos][2] = $last - $step; + + if ($this->_blocks[$this->_pos][1] <= $this->_blocks[$this->_pos][2]) { + $this->_pos ++; + } + + $this->_current = $type; + $this->_blocks[$this->_pos] = [$type, $last - $step + 1, $last, $value]; + + return $this; + } + + /** + * @return $this + */ + private function combineBlock() + { + if ($this->_pos < 1) { + return $this; + } + + $prev = $this->_blocks[$this->_pos - 1]; + $current = $this->_blocks[$this->_pos]; + + $prev[2] = $current[2]; + $this->_blocks[$this->_pos - 1] = $prev; + $this->_current = $prev[0]; + unset($this->_blocks[$this->_pos]); + $this->_pos --; + + return $this; + } +} + diff --git a/var/Markdown.php b/var/Markdown.php index f8797f8e..5df4970d 100644 --- a/var/Markdown.php +++ b/var/Markdown.php @@ -21,10 +21,10 @@ class Markdown static $parser; if (empty($parser)) { - $parser = new MarkdownExtraExtended(); + $parser = new HyperDown(); } - return $parser->transform($text); + return $parser->makeHtml($text); } } diff --git a/var/MarkdownExtraExtended.php b/var/MarkdownExtraExtended.php deleted file mode 100644 index efd1ffce..00000000 --- a/var/MarkdownExtraExtended.php +++ /dev/null @@ -1,3302 +0,0 @@ - -# -# Original Markdown -# Copyright (c) 2004-2006 John Gruber -# -# - -# -# Markdown Parser Class -# - -class _Markdown { - - ### Version ### - - const MARKDOWNLIB_VERSION = "1.3"; - - ### Configuration Variables ### - - # Change to ">" for HTML output. - public $empty_element_suffix = " />"; - public $tab_width = 4; - - # Change to `true` to disallow markup or entities. - public $no_markup = false; - public $no_entities = false; - - # Predefined urls and titles for reference links and images. - public $predef_urls = array(); - public $predef_titles = array(); - - - ### Parser Implementation ### - - # Regex to match balanced [brackets]. - # Needed to insert a maximum bracked depth while converting to PHP. - protected $nested_brackets_depth = 6; - protected $nested_brackets_re; - - protected $nested_url_parenthesis_depth = 4; - protected $nested_url_parenthesis_re; - - # Table of hash values for escaped characters: - protected $escape_chars = '\`*_{}[]()>#+-.!'; - protected $escape_chars_re; - - - public function __construct() { - # - # Constructor function. Initialize appropriate member variables. - # - $this->_initDetab(); - $this->prepareItalicsAndBold(); - - $this->nested_brackets_re = - str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth). - str_repeat('\])*', $this->nested_brackets_depth); - - $this->nested_url_parenthesis_re = - str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth). - str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth); - - $this->escape_chars_re = '['.preg_quote($this->escape_chars).']'; - - # Sort document, block, and span gamut in ascendent priority order. - asort($this->document_gamut); - asort($this->block_gamut); - asort($this->span_gamut); - } - - - # Internal hashes used during transformation. - protected $urls = array(); - protected $titles = array(); - protected $html_hashes = array(); - - # Status flag to avoid invalid nesting. - protected $in_anchor = false; - - - protected function setup() { - # - # Called before the transformation process starts to setup parser - # states. - # - # Clear global hashes. - $this->urls = $this->predef_urls; - $this->titles = $this->predef_titles; - $this->html_hashes = array(); - - $this->in_anchor = false; - } - - protected function teardown() { - # - # Called after the transformation process to clear any variable - # which may be taking up memory unnecessarly. - # - $this->urls = array(); - $this->titles = array(); - $this->html_hashes = array(); - } - - - public function transform($text) { - # - # Main function. Performs some preprocessing on the input text - # and pass it through the document gamut. - # - $this->setup(); - - # Remove UTF-8 BOM and marker character in input, if present. - $text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text); - - # Standardize line endings: - # DOS to Unix and Mac to Unix - $text = preg_replace('{\r\n?}', "\n", $text); - - # Make sure $text ends with a couple of newlines: - $text .= "\n\n"; - - # Convert all tabs to spaces. - $text = $this->detab($text); - - # Turn block-level HTML blocks into hash entries - $text = $this->hashHTMLBlocks($text); - - # Strip any lines consisting only of spaces and tabs. - # This makes subsequent regexen easier to write, because we can - # match consecutive blank lines with /\n+/ instead of something - # contorted like /[ ]*\n+/ . - $text = preg_replace('/^[ ]+$/m', '', $text); - - # Run document gamut methods. - foreach ($this->document_gamut as $method => $priority) { - $text = $this->$method($text); - } - - $this->teardown(); - - $text = preg_replace_callback("/<\/?(\!doctype|html|head|body|link|title|input|select|button|textarea|style|noscript)[^>]*>/is", - array($this, '_doEscape_callback'), $text); - - return $text . "\n"; - } - - /** - * _doEscape_callback - * - * @param array $matches - * @access protected - * @return string - */ - protected function _doEscape_callback($matches) { - return htmlspecialchars($matches[0], ENT_NOQUOTES); - } - - protected $document_gamut = array( - # Strip link definitions, store in hashes. - "stripLinkDefinitions" => 20, - - "runBasicBlockGamut" => 30, - ); - - - protected function stripLinkDefinitions($text) { - # - # Strips link definitions from text, stores the URLs and titles in - # hash references. - # - $less_than_tab = $this->tab_width - 1; - - # Link defs are in the form: ^[id]: url "optional title" - $text = preg_replace_callback('{ - ^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1 - [ ]* - \n? # maybe *one* newline - [ ]* - (?: - <(.+?)> # url = $2 - | - (\S+?) # url = $3 - ) - [ ]* - \n? # maybe one newline - [ ]* - (?: - (?<=\s) # lookbehind for whitespace - ["(] - (.*?) # title = $4 - [")] - [ ]* - )? # title is optional - (?:\n+|\Z) - }xm', - array($this, '_stripLinkDefinitions_callback'), - $text); - return $text; - } - protected function _stripLinkDefinitions_callback($matches) { - $link_id = strtolower($matches[1]); - $url = $matches[2] == '' ? $matches[3] : $matches[2]; - $this->urls[$link_id] = $url; - $this->titles[$link_id] =& $matches[4]; - return ''; # String that will replace the block - } - - - protected function hashHTMLBlocks($text) { - if ($this->no_markup) return $text; - - $less_than_tab = $this->tab_width - 1; - - # Hashify HTML blocks: - # We only want to do this for block-level HTML tags, such as headers, - # lists, and tables. That's because we still want to wrap

    s around - # "paragraphs" that are wrapped in non-block-level tags, such as anchors, - # phrase emphasis, and spans. The list of tags we're looking for is - # hard-coded: - # - # * List "a" is made of tags which can be both inline or block-level. - # These will be treated block-level when the start tag is alone on - # its line, otherwise they're not matched here and will be taken as - # inline later. - # * List "b" is made of tags which are always block-level; - # - $block_tags_a_re = 'ins|del'; - $block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'. - 'script|noscript|form|fieldset|iframe|math|svg|'. - 'article|section|nav|aside|hgroup|header|footer|'. - 'figure'; - - # Regular expression for the content of a block tag. - $nested_tags_level = 4; - $attr = ' - (?> # optional tag attributes - \s # starts with whitespace - (?> - [^>"/]+ # text outside quotes - | - /+(?!>) # slash not followed by ">" - | - "[^"]*" # text inside double quotes (tolerate ">") - | - \'[^\']*\' # text inside single quotes (tolerate ">") - )* - )? - '; - $content = - str_repeat(' - (?> - [^<]+ # content without tag - | - <\2 # nested opening tag - '.$attr.' # attributes - (?> - /> - | - >', $nested_tags_level). # end of opening tag - '.*?'. # last level nested tag content - str_repeat(' - # closing nested tag - ) - | - <(?!/\2\s*> # other tags with a different name - ) - )*', - $nested_tags_level); - $content2 = str_replace('\2', '\3', $content); - - # First, look for nested blocks, e.g.: - #

    - #
    - # tags for inner block must be indented. - #
    - #
    - # - # The outermost tags must start at the left margin for this to match, and - # the inner nested divs must be indented. - # We need to do this before the next, more liberal match, because the next - # match will start at the first `
    ` and stop at the first `
    `. - $text = preg_replace_callback('{(?> - (?> - (?<=\n\n) # Starting after a blank line - | # or - \A\n? # the beginning of the doc - ) - ( # save in $1 - - # Match from `\n` to `\n`, handling nested tags - # in between. - - [ ]{0,'.$less_than_tab.'} - <('.$block_tags_b_re.')# start tag = $2 - '.$attr.'> # attributes followed by > and \n - '.$content.' # content, support nesting - # the matching end tag - [ ]* # trailing spaces/tabs - (?=\n+|\Z) # followed by a newline or end of document - - | # Special version for tags of group a. - - [ ]{0,'.$less_than_tab.'} - <('.$block_tags_a_re.')# start tag = $3 - '.$attr.'>[ ]*\n # attributes followed by > - '.$content2.' # content, support nesting - # the matching end tag - [ ]* # trailing spaces/tabs - (?=\n+|\Z) # followed by a newline or end of document - - | # Special case just for
    . It was easier to make a special - # case than to make the other regex more complicated. - - [ ]{0,'.$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,'.$less_than_tab.'} - (?s: - - ) - [ ]* - (?=\n{2,}|\Z) # followed by a blank line or end of document - - | # PHP and ASP-style processor instructions ( - ) - [ ]* - (?=\n{2,}|\Z) # followed by a blank line or end of document - - ) - )}Sxmi', - array($this, '_hashHTMLBlocks_callback'), - $text); - - return $text; - } - protected function _hashHTMLBlocks_callback($matches) { - $text = $matches[1]; - return $this->hashBlock($text); - // return "\n\n$key\n\n"; - } - - - protected function hashPart($text, $boundary = 'X') { - # - # Called whenever a tag must be hashed when a function insert an atomic - # element in the text stream. Passing $text to through this function gives - # a unique text-token which will be reverted back when calling unhash. - # - # The $boundary argument specify what character should be used to surround - # the token. By convension, "B" is used for block elements that needs not - # to be wrapped into paragraph tags at the end, ":" is used for elements - # that are word separators and "X" is used in the general case. - # - # Swap back any tag hash found in $text so we do not have to `unhash` - # multiple times at the end. - $text = $this->unhash($text); - - # Then hash the block. - static $i = 0; - $key = "$boundary\x1A" . ++$i . $boundary; - $this->html_hashes[$key] = $text; - return $key; # String that will replace the tag. - } - - - protected function hashBlock($text) { - # - # Shortcut function for hashPart with block-level boundaries. - # - return $this->hashPart($text, 'B'); - } - - - protected $block_gamut = array( - # - # These are all the transformations that form block-level - # tags like paragraphs, headers, and list items. - # - "doHeaders" => 10, - "doHorizontalRules" => 20, - - "doLists" => 40, - "doCodeBlocks" => 50, - "doBlockQuotes" => 60, - ); - - protected function runBlockGamut($text) { - # - # Run block gamut tranformations. - # - # We need to escape raw HTML in Markdown source before doing anything - # else. This need to be done for each block, and not only at the - # begining in the Markdown function since hashed blocks can be part of - # list items and could have been indented. Indented blocks would have - # been seen as a code block in a previous pass of hashHTMLBlocks. - $text = $this->hashHTMLBlocks($text); - - return $this->runBasicBlockGamut($text); - } - - protected function runBasicBlockGamut($text) { - # - # Run block gamut tranformations, without hashing HTML blocks. This is - # useful when HTML blocks are known to be already hashed, like in the first - # whole-document pass. - # - foreach ($this->block_gamut as $method => $priority) { - $text = $this->$method($text); - } - - # Finally form paragraph and restore hashed blocks. - $text = $this->formParagraphs($text); - - return $text; - } - - - protected function doHorizontalRules($text) { - # Do Horizontal Rules: - return preg_replace( - '{ - ^[ ]{0,3} # Leading space - ([-*_]) # $1: First marker - (?> # Repeated marker group - [ ]{0,2} # Zero, one, or two spaces. - \1 # Marker character - ){2,} # Group repeated at least twice - [ ]* # Tailing spaces - $ # End of line. - }mx', - "\n".$this->hashBlock("empty_element_suffix")."\n", - $text); - } - - - protected $span_gamut = array( - # - # These are all the transformations that occur *within* block-level - # tags like paragraphs, headers, and list items. - # - # Process character escapes, code spans, and inline HTML - # in one shot. - "parseSpan" => -30, - - # Process anchor and image tags. Images must come first, - # because ![foo][f] looks like an anchor. - "doImages" => 10, - "doAnchors" => 20, - - # Make links out of things like `` - # Must come after doAnchors, because you can use < and > - # delimiters in inline links like [this](). - "doAutoLinks" => 30, - "encodeAmpsAndAngles" => 40, - - "doItalicsAndBold" => 50, - "doHardBreaks" => 60, - ); - - protected function runSpanGamut($text) { - # - # Run span gamut tranformations. - # - foreach ($this->span_gamut as $method => $priority) { - $text = $this->$method($text); - } - - return $text; - } - - - protected function doHardBreaks($text) { - # Do hard breaks: - return preg_replace_callback('/ {2,}\n/', - array($this, '_doHardBreaks_callback'), $text); - } - protected function _doHardBreaks_callback($matches) { - return $this->hashPart("empty_element_suffix\n"); - } - - - protected function doAnchors($text) { - # - # Turn Markdown link shortcuts into XHTML tags. - # - if ($this->in_anchor) return $text; - $this->in_anchor = true; - - # - # First, handle reference-style links: [link text] [id] - # - $text = preg_replace_callback('{ - ( # wrap whole match in $1 - \[ - ('.$this->nested_brackets_re.') # link text = $2 - \] - - [ ]? # one optional space - (?:\n[ ]*)? # one optional newline followed by spaces - - \[ - (.*?) # id = $3 - \] - ) - }xs', - array($this, '_doAnchors_reference_callback'), $text); - - # - # Next, inline-style links: [link text](url "optional title") - # - $text = preg_replace_callback('{ - ( # wrap whole match in $1 - \[ - ('.$this->nested_brackets_re.') # link text = $2 - \] - \( # literal paren - [ \n]* - (?: - <(.+?)> # href = $3 - | - ('.$this->nested_url_parenthesis_re.') # href = $4 - ) - [ \n]* - ( # $5 - ([\'"]) # quote char = $6 - (.*?) # Title = $7 - \6 # matching quote - [ \n]* # ignore any spaces/tabs between closing quote and ) - )? # title is optional - \) - ) - }xs', - array($this, '_doAnchors_inline_callback'), $text); - - # - # Last, handle reference-style shortcuts: [link text] - # These must come last in case you've also got [link text][1] - # or [link text](/foo) - # - $text = preg_replace_callback('{ - ( # wrap whole match in $1 - \[ - ([^\[\]]+) # link text = $2; can\'t contain [ or ] - \] - ) - }xs', - array($this, '_doAnchors_reference_callback'), $text); - - $this->in_anchor = false; - return $text; - } - protected function _doAnchors_reference_callback($matches) { - $whole_match = $matches[1]; - $link_text = $matches[2]; - $link_id =& $matches[3]; - - if ($link_id == "") { - # for shortcut links like [this][] or [this]. - $link_id = $link_text; - } - - # lower-case and turn embedded newlines into spaces - $link_id = strtolower($link_id); - $link_id = preg_replace('{[ ]?\n}', ' ', $link_id); - - if (isset($this->urls[$link_id])) { - $url = $this->urls[$link_id]; - $url = $this->encodeAttribute($url); - - $result = "titles[$link_id] ) ) { - $title = $this->titles[$link_id]; - $title = $this->encodeAttribute($title); - $result .= " title=\"$title\""; - } - - $link_text = $this->runSpanGamut($link_text); - $result .= ">$link_text"; - $result = $this->hashPart($result); - } - else { - $result = $whole_match; - } - return $result; - } - protected function _doAnchors_inline_callback($matches) { - $whole_match = $matches[1]; - $link_text = $this->runSpanGamut($matches[2]); - $url = $matches[3] == '' ? $matches[4] : $matches[3]; - $title =& $matches[7]; - - $url = $this->encodeAttribute($url); - - $result = "encodeAttribute($title); - $result .= " title=\"$title\""; - } - - $link_text = $this->runSpanGamut($link_text); - $result .= ">$link_text"; - - return $this->hashPart($result); - } - - - protected function doImages($text) { - # - # Turn Markdown image shortcuts into tags. - # - # - # First, handle reference-style labeled images: ![alt text][id] - # - $text = preg_replace_callback('{ - ( # wrap whole match in $1 - !\[ - ('.$this->nested_brackets_re.') # alt text = $2 - \] - - [ ]? # one optional space - (?:\n[ ]*)? # one optional newline followed by spaces - - \[ - (.*?) # id = $3 - \] - - ) - }xs', - array($this, '_doImages_reference_callback'), $text); - - # - # Next, handle inline images: ![alt text](url "optional title") - # Don't forget: encode * and _ - # - $text = preg_replace_callback('{ - ( # wrap whole match in $1 - !\[ - ('.$this->nested_brackets_re.') # alt text = $2 - \] - \s? # One optional whitespace character - \( # literal paren - [ \n]* - (?: - <(\S*)> # src url = $3 - | - ('.$this->nested_url_parenthesis_re.') # src url = $4 - ) - [ \n]* - ( # $5 - ([\'"]) # quote char = $6 - (.*?) # title = $7 - \6 # matching quote - [ \n]* - )? # title is optional - \) - ) - }xs', - array($this, '_doImages_inline_callback'), $text); - - return $text; - } - protected function _doImages_reference_callback($matches) { - $whole_match = $matches[1]; - $alt_text = $matches[2]; - $link_id = strtolower($matches[3]); - - if ($link_id == "") { - $link_id = strtolower($alt_text); # for shortcut links like ![this][]. - } - - $alt_text = $this->encodeAttribute($alt_text); - if (isset($this->urls[$link_id])) { - $url = $this->encodeAttribute($this->urls[$link_id]); - $result = "\"$alt_text\"";titles[$link_id])) { - $title = $this->titles[$link_id]; - $title = $this->encodeAttribute($title); - $result .= " title=\"$title\""; - } - $result .= $this->empty_element_suffix; - $result = $this->hashPart($result); - } - else { - # If there's no such link ID, leave intact: - $result = $whole_match; - } - - return $result; - } - protected function _doImages_inline_callback($matches) { - $whole_match = $matches[1]; - $alt_text = $matches[2]; - $url = $matches[3] == '' ? $matches[4] : $matches[3]; - $title =& $matches[7]; - - $alt_text = $this->encodeAttribute($alt_text); - $url = $this->encodeAttribute($url); - $result = "\"$alt_text\"";encodeAttribute($title); - $result .= " title=\"$title\""; # $title already quoted - } - $result .= $this->empty_element_suffix; - - return $this->hashPart($result); - } - - - protected function doHeaders($text) { - # Setext-style headers: - # Header 1 - # ======== - # - # Header 2 - # -------- - # - $text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx', - array($this, '_doHeaders_callback_setext'), $text); - - # atx-style headers: - # # Header 1 - # ## Header 2 - # ## Header 2 with closing hashes ## - # ... - # ###### Header 6 - # - $text = preg_replace_callback('{ - ^(\#{1,6}) # $1 = string of #\'s - [ ]* - (.+?) # $2 = Header text - [ ]* - \#* # optional closing #\'s (not counted) - \n+ - }xm', - array($this, '_doHeaders_callback_atx'), $text); - - return $text; - } - protected function _doHeaders_callback_setext($matches) { - # Terrible hack to check we haven't found an empty list item. - if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1])) - return $matches[0]; - - $level = $matches[2]{0} == '=' ? 1 : 2; - $block = "".$this->runSpanGamut($matches[1]).""; - return "\n" . $this->hashBlock($block) . "\n\n"; - } - protected function _doHeaders_callback_atx($matches) { - $level = strlen($matches[1]); - $block = "".$this->runSpanGamut($matches[2]).""; - return "\n" . $this->hashBlock($block) . "\n\n"; - } - - - protected function doLists($text) { - # - # Form HTML ordered (numbered) and unordered (bulleted) lists. - # - $less_than_tab = $this->tab_width - 1; - - # Re-usable patterns to match list item bullets and number markers: - $marker_ul_re = '[*+-]'; - $marker_ol_re = '\d+[\.]'; - $marker_any_re = "(?:$marker_ul_re|$marker_ol_re)"; - - $markers_relist = array( - $marker_ul_re => $marker_ol_re, - $marker_ol_re => $marker_ul_re, - ); - - foreach ($markers_relist as $marker_re => $other_marker_re) { - # Re-usable pattern to match any entirel ul or ol list: - $whole_list_re = ' - ( # $1 = whole list - ( # $2 - ([ ]{0,'.$less_than_tab.'}) # $3 = number of spaces - ('.$marker_re.') # $4 = first list item marker - [ ]+ - ) - (?s:.+?) - ( # $5 - \z - | - \n{2,} - (?=\S) - (?! # Negative lookahead for another list item marker - [ ]* - '.$marker_re.'[ ]+ - ) - | - (?= # Lookahead for another kind of list - \n - \3 # Must have the same indentation - '.$other_marker_re.'[ ]+ - ) - ) - ) - '; // mx - - # We use a different prefix before nested lists than top-level lists. - # See extended comment in _ProcessListItems(). - - if ($this->list_level) { - $text = preg_replace_callback('{ - ^ - '.$whole_list_re.' - }mx', - array($this, '_doLists_callback'), $text); - } - else { - $text = preg_replace_callback('{ - (?:(?<=\n)\n?|\A\n?) # Must eat the newline - '.$whole_list_re.' - }mx', - array($this, '_doLists_callback'), $text); - } - } - - return $text; - } - protected function _doLists_callback($matches) { - # Re-usable patterns to match list item bullets and number markers: - $marker_ul_re = '[*+-]'; - $marker_ol_re = '\d+[\.]'; - $marker_any_re = "(?:$marker_ul_re|$marker_ol_re)"; - - $list = $matches[1]; - $list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol"; - - $marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re ); - - $list .= "\n"; - $result = $this->processListItems($list, $marker_any_re); - - $result = $this->hashBlock("<$list_type>\n" . $result . ""); - return "\n". $result ."\n\n"; - } - - protected $list_level = 0; - - protected function processListItems($list_str, $marker_any_re) { - # - # Process the contents of a single ordered or unordered list, splitting it - # into individual list items. - # - # The $this->list_level global keeps track of when we're inside a list. - # Each time we enter a list, we increment it; when we leave a list, - # we decrement. If it's zero, we're not in a list anymore. - # - # We do this because when we're not inside a list, we want to treat - # something like this: - # - # I recommend upgrading to version - # 8. Oops, now this line is treated - # as a sub-list. - # - # As a single paragraph, despite the fact that the second line starts - # with a digit-period-space sequence. - # - # Whereas when we're inside a list (or sub-list), that line will be - # treated as the start of a sub-list. What a kludge, huh? This is - # an aspect of Markdown's syntax that's hard to parse perfectly - # without resorting to mind-reading. Perhaps the solution is to - # change the syntax rules such that sub-lists must start with a - # starting cardinal number; e.g. "1." or "a.". - - $this->list_level++; - - # trim trailing blank lines: - $list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str); - - $list_str = preg_replace_callback('{ - (\n)? # leading line = $1 - (^[ ]*) # leading whitespace = $2 - ('.$marker_any_re.' # list marker and space = $3 - (?:[ ]+|(?=\n)) # space only required if item is not empty - ) - ((?s:.*?)) # list item text = $4 - (?:(\n+(?=\n))|\n) # tailing blank line = $5 - (?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n)))) - }xm', - array($this, '_processListItems_callback'), $list_str); - - $this->list_level--; - return $list_str; - } - protected function _processListItems_callback($matches) { - $item = $matches[4]; - $leading_line =& $matches[1]; - $leading_space =& $matches[2]; - $marker_space = $matches[3]; - $tailing_blank_line =& $matches[5]; - - if ($leading_line || $tailing_blank_line || - preg_match('/\n{2,}/', $item)) - { - # Replace marker with the appropriate whitespace indentation - $item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item; - $item = $this->runBlockGamut($this->outdent($item)."\n"); - } - else { - # Recursion for sub-lists: - $item = $this->doLists($this->outdent($item)); - $item = preg_replace('/\n+$/', '', $item); - $item = $this->runSpanGamut($item); - } - - return "
  • " . $item . "
    • \n"; - } - - - protected function doCodeBlocks($text) { - # - # Process Markdown `
    ` blocks.
-	#
-		$text = preg_replace_callback('{
-				(?:\n\n|\A\n?)
-				(	            # $1 = the code block -- one or more lines, starting with a space/tab
-				  (?>
-					[ ]{'.$this->tab_width.'}  # Lines must start with a tab or a tab-width of spaces
-					.*\n+
-				  )+
-				)
-				((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
-			}xm',
-			array($this, '_doCodeBlocks_callback'), $text);
-
-		return $text;
-	}
-	protected function _doCodeBlocks_callback($matches) {
-		$codeblock = $this->unhash($matches[1]);
-
-		$codeblock = $this->outdent($codeblock);
-		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
-
-		# trim leading newlines and trailing newlines
-		$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
-
-		$codeblock = "
    $codeblock\n
    ";
-		return "\n\n".$this->hashBlock($codeblock)."\n\n";
-	}
-
-
-	protected function makeCodeSpan($code) {
-	#
-	# Create a code span markup for $code. Called from handleSpanToken.
-	#
-		$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
-		return $this->hashPart("$code");
-	}
-
-
-	protected $em_relist = array(
-		''  => '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(?em_relist as $em => $em_re) {
-			foreach ($this->strong_relist as $strong => $strong_re) {
-				# Construct list of allowed token expressions.
-				$token_relist = array();
-				if (isset($this->em_strong_relist["$em$strong"])) {
-					$token_relist[] = $this->em_strong_relist["$em$strong"];
-				}
-				$token_relist[] = $em_re;
-				$token_relist[] = $strong_re;
-				
-				# Construct master expression from list.
-				$token_re = '{('. implode('|', $token_relist) .')}';
-				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
-			}
-		}
-	}
-	
-	protected function doItalicsAndBold($text) {
-		$token_stack = array('');
-		$text_stack = array('');
-		$em = '';
-		$strong = '';
-		$tree_char_em = false;
-		
-		while (1) {
-			#
-			# Get prepared regular expression for seraching emphasis tokens
-			# in current context.
-			#
-			$token_re = $this->em_strong_prepared_relist["$em$strong"];
-			
-			#
-			# Each loop iteration search for the next emphasis token. 
-			# Each token is then passed to handleSpanToken.
-			#
-			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
-			$text_stack[0] .= $parts[0];
-			$token =& $parts[1];
-			$text =& $parts[2];
-			
-			if (empty($token)) {
-				# Reached end of text span: empty stack without emitting.
-				# any more emphasis.
-				while ($token_stack[0]) {
-					$text_stack[1] .= array_shift($token_stack);
-					$text_stack[0] .= array_shift($text_stack);
-				}
-				break;
-			}
-			
-			$token_len = strlen($token);
-			if ($tree_char_em) {
-				# Reached closing marker while inside a three-char emphasis.
-				if ($token_len == 3) {
-					# Three-char closing marker, close em and strong.
-					array_shift($token_stack);
-					$span = array_shift($text_stack);
-					$span = $this->runSpanGamut($span);
-					$span = "$span";
-					$text_stack[0] .= $this->hashPart($span);
-					$em = '';
-					$strong = '';
-				} else {
-					# Other closing marker: close one em or strong and
-					# change current token state to match the other
-					$token_stack[0] = str_repeat($token{0}, 3-$token_len);
-					$tag = $token_len == 2 ? "strong" : "em";
-					$span = $text_stack[0];
-					$span = $this->runSpanGamut($span);
-					$span = "<$tag>$span";
-					$text_stack[0] = $this->hashPart($span);
-					$$tag = ''; # $$tag stands for $em or $strong
-				}
-				$tree_char_em = false;
-			} else if ($token_len == 3) {
-				if ($em) {
-					# Reached closing marker for both em and strong.
-					# Closing strong marker:
-					for ($i = 0; $i < 2; ++$i) {
-						$shifted_token = array_shift($token_stack);
-						$tag = strlen($shifted_token) == 2 ? "strong" : "em";
-						$span = array_shift($text_stack);
-						$span = $this->runSpanGamut($span);
-						$span = "<$tag>$span";
-						$text_stack[0] .= $this->hashPart($span);
-						$$tag = ''; # $$tag stands for $em or $strong
-					}
-				} else {
-					# Reached opening three-char emphasis marker. Push on token 
-					# stack; will be handled by the special condition above.
-					$em = $token{0};
-					$strong = "$em$em";
-					array_unshift($token_stack, $token);
-					array_unshift($text_stack, '');
-					$tree_char_em = true;
-				}
-			} else if ($token_len == 2) {
-				if ($strong) {
-					# Unwind any dangling emphasis marker:
-					if (strlen($token_stack[0]) == 1) {
-						$text_stack[1] .= array_shift($token_stack);
-						$text_stack[0] .= array_shift($text_stack);
-					}
-					# Closing strong marker:
-					array_shift($token_stack);
-					$span = array_shift($text_stack);
-					$span = $this->runSpanGamut($span);
-					$span = "$span";
-					$text_stack[0] .= $this->hashPart($span);
-					$strong = '';
-				} else {
-					array_unshift($token_stack, $token);
-					array_unshift($text_stack, '');
-					$strong = $token;
-				}
-			} else {
-				# Here $token_len == 1
-				if ($em) {
-					if (strlen($token_stack[0]) == 1) {
-						# Closing emphasis marker:
-						array_shift($token_stack);
-						$span = array_shift($text_stack);
-						$span = $this->runSpanGamut($span);
-						$span = "$span";
-						$text_stack[0] .= $this->hashPart($span);
-						$em = '';
-					} else {
-						$text_stack[0] .= $token;
-					}
-				} else {
-					array_unshift($token_stack, $token);
-					array_unshift($text_stack, '');
-					$em = $token;
-				}
-			}
-		}
-		return $text_stack[0];
-	}
-
-
-	protected function doBlockQuotes($text) {
-		$text = preg_replace_callback('/
-			  (								# Wrap whole match in $1
-				(?>
-				  ^[ ]*>[ ]?			# ">" at the start of a line
-					.+\n					# rest of the first line
-				  (.+\n)*					# subsequent consecutive lines
-				  \n*						# blanks
-				)+
-			  )
-			/xm',
-			array($this, '_doBlockQuotes_callback'), $text);
-
-		return $text;
-	}
-	protected function _doBlockQuotes_callback($matches) {
-		$bq = $matches[1];
-		# trim one level of quoting - trim whitespace-only lines
-		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
-		$bq = $this->runBlockGamut($bq);		# recurse
-
-		$bq = preg_replace('/^/m', "  ", $bq);
-		# These leading spaces cause problem with 
     content, 
-		# so we need to fix that:
-		$bq = preg_replace_callback('{(\s*
    .+?
    )}sx', 
-			array($this, '_doBlockQuotes_callback2'), $bq);
-
-		return "\n". $this->hashBlock("
    \n$bq\n
    ")."\n\n";
-	}
-	protected function _doBlockQuotes_callback2($matches) {
-		$pre = $matches[1];
-		$pre = preg_replace('/^  /m', '', $pre);
-		return $pre;
-	}
-
-
-	protected function formParagraphs($text) {
-	#
-	#	Params:
-	#		$text - string to process with html 
     tags
-	#
-		# Strip leading and trailing lines:
-		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
-
-		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
-
-		#
-		# Wrap 
     tags and unhashify HTML blocks
-		#
-		foreach ($grafs as $key => $value) {
-			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
-				# Is a paragraph.
-				$value = $this->runSpanGamut($value);
-				$value = preg_replace('/^([ ]*)/', "
    ", $value);
-				$value .= "
    ";
-				$grafs[$key] = $this->unhash($value);
-			}
-			else {
-				# Is a block.
-				# Modify elements of @grafs in-place...
-				$graf = $value;
-				$block = $this->html_hashes[$graf];
-				$graf = $block;
-//				if (preg_match('{
-//					\A
-//					(							# $1 = 
     tag
-//					  
    ]*
-//					  \b
-//					  markdown\s*=\s*  ([\'"])	#	$2 = attr quote char
-//					  1
-//					  \2
-//					  [^>]*
-//					  >
-//					)
-//					(							# $3 = contents
-//					.*
-//					)
-//					(
    )					# $4 = closing tag
-//					\z
-//					}xs', $block, $matches))
-//				{
-//					list(, $div_open, , $div_content, $div_close) = $matches;
-//
-//					# We can't call Markdown(), because that resets the hash;
-//					# that initialization code should be pulled into its own sub, though.
-//					$div_content = $this->hashHTMLBlocks($div_content);
-//					
-//					# Run document gamut methods on the content.
-//					foreach ($this->document_gamut as $method => $priority) {
-//						$div_content = $this->$method($div_content);
-//					}
-//
-//					$div_open = preg_replace(
-//						'{\smarkdown\s*=\s*([\'"]).+?\1}', '', $div_open);
-//
-//					$graf = $div_open . "\n" . $div_content . "\n" . $div_close;
-//				}
-				$grafs[$key] = $graf;
-			}
-		}
-
-		return implode("\n\n", $grafs);
-	}
-
-
-	protected function encodeAttribute($text) {
-	#
-	# Encode text for a double-quoted HTML attribute. This function
-	# is *not* suitable for attributes enclosed in single quotes.
-	#
-		$text = $this->encodeAmpsAndAngles($text);
-		$text = str_replace('"', '"', $text);
-		return $text;
-	}
-	
-	
-	protected function encodeAmpsAndAngles($text) {
-	#
-	# 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.
-	#
-		if ($this->no_entities) {
-			$text = str_replace('&', '&', $text);
-		} else {
-			# Ampersand-encoding based entirely on Nat Irons's Amputator
-			# MT plugin: 
-			$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/', 
-								'&', $text);;
-		}
-		# Encode remaining <'s
-		$text = str_replace('<', '<', $text);
-
-		return $text;
-	}
-
-
-	protected function doAutoLinks($text) {
-		$text = preg_replace_callback('/(="|<)?\b(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\])])(?=$|\W)/i', 
-			array($this, '_doAutoLinks_url_callback'), $text);
-		$text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}i', 
-			array($this, '_doAutoLinks_url_callback_replace'), $text);
-
-		# Email addresses: 
-		$text = preg_replace_callback('{
-			<
-			(?:mailto:)?
-			(
-				(?:
-					[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
-				|
-					".*?"
-				)
-				\@
-				(?:
-					[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
-				|
-					\[[\d.a-fA-F:]+\]	# IPv4 & IPv6
-				)
-			)
-			>
-			}xi',
-			array($this, '_doAutoLinks_email_callback'), $text);
-
-		return $text;
-	}
-    protected function _doAutoLinks_url_callback_replace($matches) {
-        $url = $this->encodeAttribute($matches[1]);
-        $link = "$url";
-        return $this->hashPart($link);
-    }
-
-    private $tail;
-
-	protected function _doAutoLinks_url_callback($matches) {
-        list ($wholeMatch, $lookbehind, $protocol, $link) = $matches;
-
-        if ($lookbehind) {
-            return $wholeMatch;
-        }
-
-        if ($link[strlen($link) - 1] != ')') {
-            return '<' . $protocol . $link . '>';
-        }
-
-        $level = 0;
-        if (preg_match_all("/[()]/", $link, $matches)) {
-            foreach ($matches[0] as $op) {
-                if ('(' == $op) {
-                    if ($level <= 0) {
-                        $level = 1;
-                    } else {
-                        $level ++;
-                    }
-                } else {
-                    $level --;
-                }
-            }
-        }
-
-        $this->tail = '';
-        if ($level < 0) {
-            $link = preg_replace_callback("/\){1," . (- $level) . "}$/", 
-                array($this, '_doAutoLinks_url_callback_callback'), $link);
-        }
-
-		$url = $this->encodeAttribute($protocol . $link);
-		$link = "$url";
-		return $this->hashPart($link) . $this->tail;
-	}
-
-	protected function _doAutoLinks_email_callback($matches) {
-		$address = $matches[1];
-		$link = $this->encodeEmailAddress($address);
-		return $this->hashPart($link);
-	}
-
-    protected function _doAutoLinks_url_callback_callback($matches) {
-        $this->tail = $matches[0];
-        return '';
-    }
-
-	protected function encodeEmailAddress($addr) {
-	#
-	#	Input: an email address, e.g. "foo@example.com"
-	#
-	#	Output: the email address as a mailto link, with each character
-	#		of the address encoded as either a decimal or hex entity, in
-	#		the hopes of foiling most address harvesting spam bots. E.g.:
-	#
-	#	  
    foo@exampl
-	#        e.com
    
-	#
-	#	Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
-	#   With some optimizations by Milian Wolff.
-	#
-		$addr = "mailto:" . $addr;
-		$chars = preg_split('/(? $char) {
-			$ord = ord($char);
-			# Ignore non-ascii chars.
-			if ($ord < 128) {
-				$r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
-				# roughly 10% raw, 45% hex, 45% dec
-				# '@' *must* be encoded. I insist.
-				if ($r > 90 && $char != '@') /* do nothing */;
-				else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
-				else              $chars[$key] = '&#'.$ord.';';
-			}
-		}
-		
-		$addr = implode('', $chars);
-		$text = implode('', array_slice($chars, 7)); # text without `mailto:`
-		$addr = "$text";
-
-		return $addr;
-	}
-
-
-	protected function parseSpan($str) {
-	#
-	# Take the string $str and parse it into tokens, hashing embeded HTML,
-	# escaped characters and handling code spans.
-	#
-		$output = '';
-		
-		$span_re = '{
-				(
-					\\\\'.$this->escape_chars_re.'
-				|
-					(?no_markup ? '' : '
-				|
-							# comment
-				|
-					<\?.*?\?> | <%.*?%>		# processing instruction
-				|
-					<[!$]?[-a-zA-Z0-9:_]+	# regular tags
-					(?>
-						\s
-						(?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
-					)?
-					>
-				|
-					<[-a-zA-Z0-9:_]+\s*/> # xml-style empty tag
-				|
-					 # closing tag
-			').'
-				)
-				}xs';
-
-		while (1) {
-			#
-			# Each loop iteration seach for either the next tag, the next 
-			# openning code span marker, or the next escaped character. 
-			# Each token is then passed to handleSpanToken.
-			#
-			$parts = preg_split($span_re, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
-			
-			# Create token from text preceding tag.
-			if ($parts[0] != "") {
-				$output .= $parts[0];
-			}
-			
-			# Check if we reach the end.
-			if (isset($parts[1])) {
-				$output .= $this->handleSpanToken($parts[1], $parts[2]);
-				$str = $parts[2];
-			}
-			else {
-				break;
-			}
-		}
-		
-		return $output;
-	}
-	
-	
-	protected function handleSpanToken($token, &$str) {
-	#
-	# Handle $token provided by parseSpan by determining its nature and 
-	# returning the corresponding value that should replace it.
-	#
-		switch ($token{0}) {
-			case "\\":
-				return $this->hashPart("&#". ord($token{1}). ";");
-			case "`":
-				# Search for end marker in remaining text.
-				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm', 
-					$str, $matches))
-				{
-					$str = $matches[2];
-					$codespan = $this->makeCodeSpan($matches[1]);
-					return $this->hashPart($codespan);
-				}
-				return $token; // return as text since no ending marker found.
-			default:
-				return $this->hashPart($token);
-		}
-	}
-
-
-	protected function outdent($text) {
-	#
-	# Remove one level of line-leading tabs or spaces
-	#
-		return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
-	}
-
-
-	# String length function for detab. `_initDetab` will create a function to 
-	# hanlde UTF-8 if the default function does not exist.
-	protected $utf8_strlen = 'mb_strlen';
-	
-	protected function detab($text) {
-	#
-	# Replace tabs with the appropriate amount of space.
-	#
-		# 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.
-		
-		$text = preg_replace_callback('/^.*\t.*$/m',
-			array($this, '_detab_callback'), $text);
-
-		return $text;
-	}
-	protected function _detab_callback($matches) {
-		$line = $matches[0];
-		$strlen = $this->utf8_strlen; # strlen function for UTF-8.
-		
-		# Split in blocks.
-		$blocks = explode("\t", $line);
-		# Add each blocks to the line.
-		$line = $blocks[0];
-		unset($blocks[0]); # Do not add first block twice.
-		foreach ($blocks as $block) {
-			# Calculate amount of space, insert spaces, insert block.
-			$amount = $this->tab_width - 
-				call_user_func($strlen, $line, 'UTF-8') % $this->tab_width;
-			$line .= str_repeat(" ", $amount) . $block;
-		}
-		return $line;
-	}
-	protected function _initDetab() {
-	#
-	# Check for the availability of the function in the `utf8_strlen` property
-	# (initially `mb_strlen`). If the function is not available, create a 
-	# function that will loosely count the number of UTF-8 characters with a
-	# regular expression.
-	#
-		if (function_exists($this->utf8_strlen)) return;
-		$this->utf8_strlen = array($this, '_utf8_strlen');
-	}
-
-    protected function _utf8_strlen($text) {
-        return preg_match_all(
-			"/[\\x00-\\xBF]|[\\xC0-\\xFF][\\x80-\\xBF]*/", 
-			$text, $m);
-    }
-
-
-	protected function unhash($text) {
-	#
-	# Swap back in all the tags hashed by _HashHTMLBlocks.
-	#
-		return preg_replace_callback('/(.)\x1A[0-9]+\1/', 
-			array($this, '_unhash_callback'), $text);
-	}
-	protected function _unhash_callback($matches) {
-		return $this->html_hashes[trim($matches[0])];
-	}
-}
-
-#
-# Temporary Markdown Extra Parser Implementation Class
-#
-# NOTE: DON'T USE THIS CLASS
-# Currently the implementation of of Extra resides here in this temporary class.
-# This makes it easier to propagate the changes between the three different
-# packaging styles of PHP Markdown. When this issue is resolved, this
-# MarkdownExtra_TmpImpl class here will disappear and \Michelf\MarkdownExtra
-# will contain the code. So please use \Michelf\MarkdownExtra and ignore this
-# one.
-#
-
-class MarkdownExtra extends _Markdown {
-
-	### Configuration Variables ###
-
-	# Prefix for footnote ids.
-	public $fn_id_prefix = "";
-	
-	# Optional title attribute for footnote links and backlinks.
-	public $fn_link_title = "";
-	public $fn_backlink_title = "";
-	
-	# Optional class attribute for footnote links and backlinks.
-	public $fn_link_class = "footnote-ref";
-	public $fn_backlink_class = "footnote-backref";
-
-	# Class name for table cell alignment (%% replaced left/center/right)
-	# For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center'
-	# If empty, the align attribute is used instead of a class name.
-	public $table_align_class_tmpl = '';
-
-	# Optional class prefix for fenced code block.
-	public $code_class_prefix = "";
-	# Class attribute for code blocks goes on the `code` tag;
-	# setting this to true will put attributes on the `pre` tag instead.
-	public $code_attr_on_pre = false;
-	
-	# Predefined abbreviations.
-	public $predef_abbr = array();
-
-
-	### Parser Implementation ###
-
-	public function __construct() {
-	#
-	# Constructor function. Initialize the parser object.
-	#
-		# Add extra escapable characters before parent constructor 
-		# initialize the table.
-		$this->escape_chars .= ':|';
-		
-		# Insert extra document, block, and span transformations. 
-		# Parent constructor will do the sorting.
-		$this->document_gamut += array(
-			"doFencedCodeBlocks" => 5,
-			"stripFootnotes"     => 15,
-			"stripAbbreviations" => 25,
-			"appendFootnotes"    => 50,
-			);
-		$this->block_gamut += array(
-			"doFencedCodeBlocks" => 5,
-			"doTables"           => 15,
-			"doDefLists"         => 45,
-			);
-		$this->span_gamut += array(
-			"doFootnotes"        => 5,
-			"doAbbreviations"    => 70,
-			);
-		
-		parent::__construct();
-	}
-	
-	
-	# Extra variables used during extra transformations.
-	protected $footnotes = array();
-	protected $footnotes_ordered = array();
-	protected $footnotes_ref_count = array();
-	protected $footnotes_numbers = array();
-	protected $abbr_desciptions = array();
-	protected $abbr_word_re = '';
-	
-	# Give the current footnote number.
-	protected $footnote_counter = 1;
-	
-	
-	protected function setup() {
-	#
-	# Setting up Extra-specific variables.
-	#
-		parent::setup();
-		
-		$this->footnotes = array();
-		$this->footnotes_ordered = array();
-		$this->footnotes_ref_count = array();
-		$this->footnotes_numbers = array();
-		$this->abbr_desciptions = array();
-		$this->abbr_word_re = '';
-		$this->footnote_counter = 1;
-		
-		foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
-			if ($this->abbr_word_re)
-				$this->abbr_word_re .= '|';
-			$this->abbr_word_re .= preg_quote($abbr_word);
-			$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
-		}
-	}
-	
-	protected function teardown() {
-	#
-	# Clearing Extra-specific variables.
-	#
-		$this->footnotes = array();
-		$this->footnotes_ordered = array();
-		$this->footnotes_ref_count = array();
-		$this->footnotes_numbers = array();
-		$this->abbr_desciptions = array();
-		$this->abbr_word_re = '';
-		
-		parent::teardown();
-	}
-	
-	
-	### Extra Attribute Parser ###
-
-	# Expression to use to catch attributes (includes the braces)
-	protected $id_class_attr_catch_re = '\{((?:[ ]*[#.][-_:a-zA-Z0-9]+){1,})[ ]*\}';
-	# Expression to use when parsing in a context when no capture is desired
-	protected $id_class_attr_nocatch_re = '\{(?:[ ]*[#.][-_:a-zA-Z0-9]+){1,}[ ]*\}';
-
-	protected function doExtraAttributes($tag_name, $attr) {
-	#
-	# Parse attributes caught by the $this->id_class_attr_catch_re expression
-	# and return the HTML-formatted list of attributes.
-	#
-	# Currently supported attributes are .class and #id.
-	#
-		if (empty($attr)) return "";
-		
-		# Split on components
-		preg_match_all('/[#.][-_:a-zA-Z0-9]+/', $attr, $matches);
-		$elements = $matches[0];
-
-		# handle classes and ids (only first id taken into account)
-		$classes = array();
-		$id = false;
-		foreach ($elements as $element) {
-			if ($element{0} == '.') {
-				$classes[] = substr($element, 1);
-			} else if ($element{0} == '#') {
-				if ($id === false) $id = substr($element, 1);
-			}
-		}
-
-		# compose attributes as string
-		$attr_str = "";
-		if (!empty($id)) {
-			$attr_str .= ' id="'.$id.'"';
-		}
-		if (!empty($classes)) {
-			$attr_str .= ' class="'.implode(" ", $classes).'"';
-		}
-		return $attr_str;
-	}
-
-
-	protected function stripLinkDefinitions($text) {
-	#
-	# Strips link definitions from text, stores the URLs and titles in
-	# hash references.
-	#
-		$less_than_tab = $this->tab_width - 1;
-
-		# Link defs are in the form: ^[id]: url "optional title"
-		$text = preg_replace_callback('{
-							^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?:	# id = $1
-							  [ ]*
-							  \n?				# maybe *one* newline
-							  [ ]*
-							(?:
-							  <(.+?)>			# url = $2
-							|
-							  (\S+?)			# url = $3
-							)
-							  [ ]*
-							  \n?				# maybe one newline
-							  [ ]*
-							(?:
-								(?<=\s)			# lookbehind for whitespace
-								["(]
-								(.*?)			# title = $4
-								[")]
-								[ ]*
-							)?	# title is optional
-					(?:[ ]* '.$this->id_class_attr_catch_re.' )?  # $5 = extra id & class attr
-							(?:\n+|\Z)
-			}xm',
-			array($this, '_stripLinkDefinitions_callback'),
-			$text);
-		return $text;
-	}
-	protected function _stripLinkDefinitions_callback($matches) {
-		$link_id = strtolower($matches[1]);
-		$url = $matches[2] == '' ? $matches[3] : $matches[2];
-		$this->urls[$link_id] = $url;
-		$this->titles[$link_id] =& $matches[4];
-		$this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]);
-		return ''; # String that will replace the block
-	}
-
-
-	### HTML Block Parser ###
-	
-	# Tags that are always treated as block tags:
-	protected $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';
-						   
-	# Tags treated as block tags only if the opening tag is alone on its line:
-	protected $context_block_tags_re = 'script|noscript|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
-	
-	# Tags where markdown="1" default to span mode:
-	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:
-	protected $clean_tags_re = 'script|math|svg';
-	
-	# Tags that do not need to be closed.
-	protected $auto_close_tags_re = 'hr|img|param|source|track';
-	
-
-	protected function hashHTMLBlocks($text) {
-	#
-	# Hashify HTML Blocks and "clean tags".
-	#
-	# We only want to do this for block-level HTML tags, such as headers,
-	# lists, and tables. That's because we still want to wrap 
    s around
-	# "paragraphs" that are wrapped in non-block-level tags, such as anchors,
-	# phrase emphasis, and spans. The list of tags we're looking for is
-	# hard-coded.
-	#
-	# This works by calling _HashHTMLBlocks_InMarkdown, which then calls
-	# _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1" 
-	# attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
-	#  _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
-	# These two functions are calling each other. It's recursive!
-	#
-		if ($this->no_markup)  return $text;
-
-		#
-		# Call the HTML-in-Markdown hasher.
-		#
-		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
-		
-		return $text;
-	}
-	protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
-										$enclosing_tag_re = '', $span = false)
-	{
-	#
-	# Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
-	#
-	# *   $indent is the number of space to be ignored when checking for code 
-	#     blocks. This is important because if we don't take the indent into 
-	#     account, something like this (which looks right) won't work as expected:
-	#
-	#     
    
-	#         
    
-	#         Hello World.  <-- Is this a Markdown code block or text?
-	#         
      <-- Is this a Markdown code block or a real tag?
-	#     
    
-	#
-	#     If you don't like this, just don't indent the tag on which
-	#     you apply the markdown="1" attribute.
-	#
-	# *   If $enclosing_tag_re is not empty, stops at the first unmatched closing 
-	#     tag with that name. Nested tags supported.
-	#
-	# *   If $span is true, text inside must treated as span. So any double 
-	#     newline will be replaced by a single newline so that it does not create 
-	#     paragraphs.
-	#
-	# Returns an array of that form: ( processed text , remaining text )
-	#
-		if ($text === '') return array('', '');
-
-		# Regex to check for the presense of newlines around a block tag.
-		$newline_before_re = '/(?:^\n?|\n\n)*$/';
-		$newline_after_re = 
-			'{
-				^						# Start of text following the tag.
-				(?>[ ]*)?		# Optional comment.
-				[ ]*\n					# Must be followed by newline.
-			}xs';
-		
-		# Regex to match any tag.
-		$block_tag_re =
-			'{
-				(					# $2: Capture whole tag.
-									# Tag name.
-							'.$this->block_tags_re.'			|
-							'.$this->context_block_tags_re.'	|
-							'.$this->clean_tags_re.'        	|
-							(?!\s)'.$enclosing_tag_re.'
-						)
-						(?:
-							(?=[\s"\'/a-zA-Z0-9])	# Allowed characters after tag name.
-							(?>
-								".*?"		|	# Double quotes (can contain `>`)
-								\'.*?\'   	|	# Single quotes (can contain `>`)
-								.+?				# Anything but quotes and `>`.
-							)*?
-						)?
-					>					# End of tag.
-				|
-						# HTML Comment
-				|
-					<\?.*?\?> | <%.*?%>	# Processing instruction
-				|
-						# CData Block
-				|
-					# Code span marker
-					`+
-				'. ( !$span ? ' # If not in span.
-				|
-					# Indented code block
-					(?: ^[ ]*\n | ^ | \n[ ]*\n )
-					[ ]{'.($indent+4).'}[^\n]* \n
-					(?>
-						(?: [ ]{'.($indent+4).'}[^\n]* | [ ]* ) \n
-					)*
-				|
-					# Fenced code block marker
-					(?<= ^ | \n )
-					[ ]{0,'.($indent+3).'}~{3,}
-									[ ]*
-					(?:
-					\.?[-_:a-zA-Z0-9]+ # standalone class name
-					|
-						'.$this->id_class_attr_nocatch_re.' # extra attributes
-					)?
-					[ ]*
-					\n
-				' : '' ). ' # End (if not is span).
-				)
-			}xs';
-
-		
-		$depth = 0;		# Current depth inside the tag tree.
-		$parsed = "";	# Parsed text that will be returned.
-
-		#
-		# Loop through every tag until we find the closing tag of the parent
-		# or loop until reaching the end of text if no parent tag specified.
-		#
-		do {
-			#
-			# Split the text using the first $tag_match pattern found.
-			# Text before  pattern will be first in the array, text after
-			# pattern will be at the end, and between will be any catches made 
-			# by the pattern.
-			#
-			$parts = preg_split($block_tag_re, $text, 2, 
-								PREG_SPLIT_DELIM_CAPTURE);
-			
-			# If in Markdown span mode, add a empty-string span-level hash 
-			# after each newline to prevent triggering any block element.
-			if ($span) {
-				$void = $this->hashPart("", ':');
-				$newline = "$void\n";
-				$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: Code span marker
-			#
-			if ($tag{0} == "`") {
-				# Find corresponding end marker.
-				$tag_re = preg_quote($tag);
-				if (preg_match('{^(?>.+?|\n(?!\n))*?(?.*\n)*?[ ]{'.($fence_indent).'}'.$fence_re.'[ ]*(?:\n|$)}', $text,
-					$matches)) 
-				{
-					# End marker found: pass text unchanged until marker.
-					$parsed .= $tag . $matches[0];
-					$text = substr($text, strlen($matches[0]));
-				}
-				else {
-					# No end marker: just skip it.
-					$parsed .= $tag;
-				}
-			}
-			#
-			# Check for: Indented code block.
-			#
-			else if ($tag{0} == "\n" || $tag{0} == " ") {
-				# Indented code block: pass it unchanged, will be handled 
-				# later.
-				$parsed .= $tag;
-			}
-			#
-			# Check for: Opening Block level tag or
-			#            Opening Context Block tag (like ins and del) 
-			#               used as a block tag (tag is alone on it's line).
-			#
-			else if (preg_match('{^<(?:'.$this->block_tags_re.')\b}', $tag) ||
-				(	preg_match('{^<(?:'.$this->context_block_tags_re.')\b}', $tag) &&
-					preg_match($newline_before_re, $parsed) &&
-					preg_match($newline_after_re, $text)	)
-				)
-			{
-				# Need to parse tag and following text using the HTML parser.
-				list($block_text, $text) = 
-					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashBlock", true);
-				
-				# Make sure it stays outside of any paragraph by adding newlines.
-				$parsed .= "\n\n$block_text\n\n";
-			}
-			#
-			# Check for: Clean tag (like script, math)
-			#            HTML Comments, processing instructions.
-			#
-			else if (preg_match('{^<(?:'.$this->clean_tags_re.')\b}', $tag) ||
-				$tag{1} == '!' || $tag{1} == '?')
-			{
-				# Need to parse tag and following text using the HTML parser.
-				# (don't check for markdown attribute)
-				list($block_text, $text) = 
-					$this->_hashHTMLBlocks_inHTML($tag . $text, "hashClean", false);
-				
-				$parsed .= $block_text;
-			}
-			#
-			# Check for: Tag with same name as enclosing tag.
-			#
-			else if ($enclosing_tag_re !== '' &&
-				# Same name as enclosing tag.
-				preg_match('{^= 0);
-		
-		return array($parsed, $text);
-	}
-	protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
-	#
-	# Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
-	#
-	# *   Calls $hash_method to convert any blocks.
-	# *   Stops when the first opening tag closes.
-	# *   $md_attr indicate if the use of the `markdown="1"` attribute is allowed.
-	#     (it is not inside clean tags)
-	#
-	# Returns an array of that form: ( processed text , remaining text )
-	#
-		if ($text === '') return array('', '');
-		
-		# Regex to match `markdown` attribute inside of a tag.
-		$markdown_attr_re = '
-			{
-				\s*			# Eat whitespace before the `markdown` attribute
-				markdown
-				\s*=\s*
-				(?>
-					(["\'])		# $1: quote delimiter		
-					(.*?)		# $2: attribute value
-					\1			# matching delimiter	
-				|
-					([^\s>]*)	# $3: unquoted attribute value
-				)
-				()				# $4: make $3 always defined (avoid warnings)
-			}xs';
-		
-		# Regex to match any tag.
-		$tag_re = '{
-				(					# $2: Capture whole tag.
-					
-								".*?"		|	# Double quotes (can contain `>`)
-								\'.*?\'   	|	# Single quotes (can contain `>`)
-								.+?				# Anything but quotes and `>`.
-							)*?
-						)?
-					>					# End of tag.
-				|
-						# HTML Comment
-				|
-					<\?.*?\?> | <%.*?%>	# Processing instruction
-				|
-						# 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.
-
-		#
-		# Get the name of the starting tag.
-		# (This pattern makes $base_tag_name_re safe without quoting.)
-		#
-		if (preg_match('/^<([\w:$]*)\b/', $text, $matches))
-			$base_tag_name_re = $matches[1];
-
-		#
-		# Loop through every tag until we find the corresponding closing tag.
-		#
-		do {
-			#
-			# Split the text using the first $tag_match pattern found.
-			# Text before  pattern will be first in the array, text after
-			# pattern will be at the end, and between will be any catches made 
-			# by the pattern.
-			#
-			$parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
-			
-			if (count($parts) < 3) {
-				#
-				# End of $text reached with unbalenced tag(s).
-				# In that case, we return original text unchanged and pass the
-				# first character as filtered to prevent an infinite loop in the 
-				# parent function.
-				#
-				return array($original_text{0}, substr($original_text, 1));
-			}
-			
-			$block_text .= $parts[0]; # Text before current tag.
-			$tag         = $parts[1]; # Tag to handle.
-			$text        = $parts[2]; # Remaining text after current tag.
-			
-			#
-			# Check for: Auto-close tag (like 
    )
-			#			 Comments and Processing Instructions.
-			#
-			if (preg_match('{^auto_close_tags_re.')\b}', $tag) ||
-				$tag{1} == '!' || $tag{1} == '?')
-			{
-				# Just add the tag to the block as if it was text.
-				$block_text .= $tag;
-			}
-			else {
-				#
-				# Increase/decrease nested tag count. Only do so if
-				# the tag's name match base tag's.
-				#
-				if (preg_match('{^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;
-						$indent = call_user_func($strlen, $matches[1], 'UTF-8');
-					} else {
-						$indent = 0;
-					}
-					
-					# End preceding block with this tag.
-					$block_text .= $tag;
-					$parsed .= $this->$hash_method($block_text);
-					
-					# Get enclosing tag name for the ParseMarkdown function.
-					# (This pattern makes $tag_name_re safe without quoting.)
-					preg_match('/^<([\w:$]*)\b/', $tag, $matches);
-					$tag_name_re = $matches[1];
-					
-					# Parse the content using the HTML-in-Markdown parser.
-					list ($block_text, $text)
-						= $this->_hashHTMLBlocks_inMarkdown($text, $indent, 
-							$tag_name_re, $span_mode);
-					
-					# Outdent markdown text.
-					if ($indent > 0) {
-						$block_text = preg_replace("/^[ ]{1,$indent}/m", "", 
-													$block_text);
-					}
-					
-					# Append tag content to parsed text.
-					if (!$span_mode)	$parsed .= "\n\n$block_text\n\n";
-					else				$parsed .= "$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, $text);
-	}
-
-
-	protected function hashClean($text) {
-	#
-	# Called whenever a tag must be hashed when a function inserts a "clean" tag
-	# in $text, it passes through this function and is automaticaly escaped, 
-	# blocking invalid nested overlap.
-	#
-		return $this->hashPart($text, 'C');
-	}
-
-
-	protected function doAnchors($text) {
-	#
-	# Turn Markdown link shortcuts into XHTML  tags.
-	#
-		if ($this->in_anchor) return $text;
-		$this->in_anchor = true;
-		
-		#
-		# First, handle reference-style links: [link text] [id]
-		#
-		$text = preg_replace_callback('{
-			(					# wrap whole match in $1
-			  \[
-				('.$this->nested_brackets_re.')	# link text = $2
-			  \]
-
-			  [ ]?				# one optional space
-			  (?:\n[ ]*)?		# one optional newline followed by spaces
-
-			  \[
-				(.*?)		# id = $3
-			  \]
-			)
-			}xs',
-			array($this, '_doAnchors_reference_callback'), $text);
-
-		#
-		# Next, inline-style links: [link text](url "optional title")
-		#
-		$text = preg_replace_callback('{
-			(				# wrap whole match in $1
-			  \[
-				('.$this->nested_brackets_re.')	# link text = $2
-			  \]
-			  \(			# literal paren
-				[ \n]*
-				(?:
-					<(.+?)>	# href = $3
-				|
-					('.$this->nested_url_parenthesis_re.')	# href = $4
-				)
-				[ \n]*
-				(			# $5
-				  ([\'"])	# quote char = $6
-				  (.*?)		# Title = $7
-				  \6		# matching quote
-				  [ \n]*	# ignore any spaces/tabs between closing quote and )
-				)?			# title is optional
-			  \)
-			  (?:[ ]? '.$this->id_class_attr_catch_re.' )?	 # $8 = id/class attributes
-			)
-			}xs',
-			array($this, '_doAnchors_inline_callback'), $text);
-
-		#
-		# Last, handle reference-style shortcuts: [link text]
-		# These must come last in case you've also got [link text][1]
-		# or [link text](/foo)
-		#
-		$text = preg_replace_callback('{
-			(					# wrap whole match in $1
-			  \[
-				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
-			  \]
-			)
-			}xs',
-			array($this, '_doAnchors_reference_callback'), $text);
-
-		$this->in_anchor = false;
-		return $text;
-	}
-	protected function _doAnchors_reference_callback($matches) {
-		$whole_match =  $matches[1];
-		$link_text   =  $matches[2];
-		$link_id     =& $matches[3];
-
-		if ($link_id == "") {
-			# for shortcut links like [this][] or [this].
-			$link_id = $link_text;
-		}
-		
-		# lower-case and turn embedded newlines into spaces
-		$link_id = strtolower($link_id);
-		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
-
-		if (isset($this->urls[$link_id])) {
-			$url = $this->urls[$link_id];
-			$url = $this->encodeAttribute($url);
-			
-			$result = "titles[$link_id] ) ) {
-				$title = $this->titles[$link_id];
-				$title = $this->encodeAttribute($title);
-				$result .=  " title=\"$title\"";
-			}
-			if (isset($this->ref_attr[$link_id]))
-				$result .= $this->ref_attr[$link_id];
-		
-			$link_text = $this->runSpanGamut($link_text);
-			$result .= ">$link_text";
-			$result = $this->hashPart($result);
-		}
-		else {
-			$result = $whole_match;
-		}
-		return $result;
-	}
-	protected function _doAnchors_inline_callback($matches) {
-		$whole_match	=  $matches[1];
-		$link_text		=  $this->runSpanGamut($matches[2]);
-		$url			=  $matches[3] == '' ? $matches[4] : $matches[3];
-		$title			=& $matches[7];
-		$attr  = $this->doExtraAttributes("a", $dummy =& $matches[8]);
-
-
-		$url = $this->encodeAttribute($url);
-
-		$result = "encodeAttribute($title);
-			$result .=  " title=\"$title\"";
-		}
-		$result .= $attr;
-		
-		$link_text = $this->runSpanGamut($link_text);
-		$result .= ">$link_text";
-
-		return $this->hashPart($result);
-	}
-
-
-	protected function doImages($text) {
-	#
-	# Turn Markdown image shortcuts into  tags.
-	#
-		#
-		# First, handle reference-style labeled images: ![alt text][id]
-		#
-		$text = preg_replace_callback('{
-			(				# wrap whole match in $1
-			  !\[
-				('.$this->nested_brackets_re.')		# alt text = $2
-			  \]
-
-			  [ ]?				# one optional space
-			  (?:\n[ ]*)?		# one optional newline followed by spaces
-
-			  \[
-				(.*?)		# id = $3
-			  \]
-
-			)
-			}xs', 
-			array($this, '_doImages_reference_callback'), $text);
-
-		#
-		# Next, handle inline images:  ![alt text](url "optional title")
-		# Don't forget: encode * and _
-		#
-		$text = preg_replace_callback('{
-			(				# wrap whole match in $1
-			  !\[
-				('.$this->nested_brackets_re.')		# alt text = $2
-			  \]
-			  \s?			# One optional whitespace character
-			  \(			# literal paren
-				[ \n]*
-				(?:
-					<(\S*)>	# src url = $3
-				|
-					('.$this->nested_url_parenthesis_re.')	# src url = $4
-				)
-				[ \n]*
-				(			# $5
-				  ([\'"])	# quote char = $6
-				  (.*?)		# title = $7
-				  \6		# matching quote
-				  [ \n]*
-				)?			# title is optional
-			  \)
-			  (?:[ ]? '.$this->id_class_attr_catch_re.' )?	 # $8 = id/class attributes
-			)
-			}xs',
-			array($this, '_doImages_inline_callback'), $text);
-
-		return $text;
-	}
-	protected function _doImages_reference_callback($matches) {
-		$whole_match = $matches[1];
-		$alt_text    = $matches[2];
-		$link_id     = strtolower($matches[3]);
-
-		if ($link_id == "") {
-			$link_id = strtolower($alt_text); # for shortcut links like ![this][].
-		}
-
-		$alt_text = $this->encodeAttribute($alt_text);
-		if (isset($this->urls[$link_id])) {
-			$url = $this->encodeAttribute($this->urls[$link_id]);
-			$result = "\"$alt_text\"";titles[$link_id])) {
-				$title = $this->titles[$link_id];
-				$title = $this->encodeAttribute($title);
-				$result .=  " title=\"$title\"";
-			}
-			if (isset($this->ref_attr[$link_id]))
-				$result .= $this->ref_attr[$link_id];
-			$result .= $this->empty_element_suffix;
-			$result = $this->hashPart($result);
-		}
-		else {
-			# If there's no such link ID, leave intact:
-			$result = $whole_match;
-		}
-
-		return $result;
-	}
-	protected function _doImages_inline_callback($matches) {
-		$whole_match	= $matches[1];
-		$alt_text		= $matches[2];
-		$url			= $matches[3] == '' ? $matches[4] : $matches[3];
-		$title			=& $matches[7];
-		$attr  = $this->doExtraAttributes("img", $dummy =& $matches[8]);
-
-		$alt_text = $this->encodeAttribute($alt_text);
-		$url = $this->encodeAttribute($url);
-		$result = "\"$alt_text\"";encodeAttribute($title);
-			$result .=  " title=\"$title\""; # $title already quoted
-		}
-		$result .= $attr;
-		$result .= $this->empty_element_suffix;
-
-		return $this->hashPart($result);
-	}
-
-
-	protected function doHeaders($text) {
-	#
-	# Redefined to add id and class attribute support.
-	#
-		# Setext-style headers:
-		#	  Header 1  {#header1}
-		#	  ========
-		#  
-		#	  Header 2  {#header2 .class1 .class2}
-		#	  --------
-		#
-		$text = preg_replace_callback(
-			'{
-				(^.+?)								# $1: Header text
-				(?:[ ]+ '.$this->id_class_attr_catch_re.' )?	 # $3 = id/class attributes
-				[ ]*\n(=+|-+)[ ]*\n+				# $3: Header footer
-			}mx',
-			array($this, '_doHeaders_callback_setext'), $text);
-
-		# atx-style headers:
-		#	# Header 1        {#header1}
-		#	## Header 2       {#header2}
-		#	## Header 2 with closing hashes ##  {#header3.class1.class2}
-		#	...
-		#	###### Header 6   {.class2}
-		#
-		$text = preg_replace_callback('{
-				^(\#{1,6})	# $1 = string of #\'s
-				[ ]*
-				(.+?)		# $2 = Header text
-				[ ]*
-				\#*			# optional closing #\'s (not counted)
-				(?:[ ]+ '.$this->id_class_attr_catch_re.' )?	 # $3 = id/class attributes
-				[ ]*
-				\n+
-			}xm',
-			array($this, '_doHeaders_callback_atx'), $text);
-
-		return $text;
-	}
-	protected function _doHeaders_callback_setext($matches) {
-		if ($matches[3] == '-' && preg_match('{^- }', $matches[1]))
-			return $matches[0];
-		$level = $matches[3]{0} == '=' ? 1 : 2;
-		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[2]);
-		$block = "".$this->runSpanGamut($matches[1])."";
-		return "\n" . $this->hashBlock($block) . "\n\n";
-	}
-	protected function _doHeaders_callback_atx($matches) {
-		$level = strlen($matches[1]);
-		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[3]);
-		$block = "".$this->runSpanGamut($matches[2])."";
-		return "\n" . $this->hashBlock($block) . "\n\n";
-	}
-
-
-	protected function doTables($text) {
-	#
-	# Form HTML tables.
-	#
-		$less_than_tab = $this->tab_width - 1;
-		#
-		# Find tables with leading pipe.
-		#
-		#	| Header 1 | Header 2
-		#	| -------- | --------
-		#	| Cell 1   | Cell 2
-		#	| Cell 3   | Cell 4
-		#
-		$text = preg_replace_callback('
-			{
-				^							# Start of a line
-				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
-				[|]							# Optional leading pipe (present)
-				(.+) \n						# $1: Header row (at least one pipe)
-				
-				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
-				[|] ([ ]*[-:]+[-| :]*) \n	# $2: Header underline
-				
-				(							# $3: Cells
-					(?>
-						[ ]*				# Allowed whitespace.
-						[|] .* \n			# Row content.
-					)*
-				)
-				(?=\n|\Z)					# Stop at final double newline.
-			}xm',
-			array($this, '_doTable_leadingPipe_callback'), $text);
-		
-		#
-		# Find tables without leading pipe.
-		#
-		#	Header 1 | Header 2
-		#	-------- | --------
-		#	Cell 1   | Cell 2
-		#	Cell 3   | Cell 4
-		#
-		$text = preg_replace_callback('
-			{
-				^							# Start of a line
-				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
-				(\S.*[|].*) \n				# $1: Header row (at least one pipe)
-				
-				[ ]{0,'.$less_than_tab.'}	# Allowed whitespace.
-				([-:]+[ ]*[|][-| :]*) \n	# $2: Header underline
-				
-				(							# $3: Cells
-					(?>
-						.* [|] .* \n		# Row content
-					)*
-				)
-				(?=\n|\Z)					# Stop at final double newline.
-			}xm',
-			array($this, '_DoTable_callback'), $text);
-
-		return $text;
-	}
-	protected function _doTable_leadingPipe_callback($matches) {
-		$head		= $matches[1];
-		$underline	= $matches[2];
-		$content	= $matches[3];
-		
-		# Remove leading pipe for each row.
-		$content	= preg_replace('/^ *[|]/m', '', $content);
-		
-		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
-	}
-	protected function _doTable_makeAlignAttr($alignname)
-	{
-		if (empty($this->table_align_class_tmpl))
-			return " align=\"$alignname\"";
-
-		$classname = str_replace('%%', $alignname, $this->table_align_class_tmpl);
-		return " class=\"$classname\"";
-	}
-	protected function _doTable_callback($matches) {
-		$head		= $matches[1];
-		$underline	= $matches[2];
-		$content	= $matches[3];
-
-		# Remove any tailing pipes for each line.
-		$head		= preg_replace('/[|] *$/m', '', $head);
-		$underline	= preg_replace('/[|] *$/m', '', $underline);
-		$content	= preg_replace('/[|] *$/m', '', $content);
-		
-		# Reading alignement from header underline.
-		$separators	= preg_split('/ *[|] */', $underline);
-		foreach ($separators as $n => $s) {
-			if (preg_match('/^ *-+: *$/', $s))
-				$attr[$n] = $this->_doTable_makeAlignAttr('right');
-			else if (preg_match('/^ *:-+: *$/', $s))
-				$attr[$n] = $this->_doTable_makeAlignAttr('center');
-			else if (preg_match('/^ *:-+ *$/', $s))
-				$attr[$n] = $this->_doTable_makeAlignAttr('left');
-			else
-				$attr[$n] = '';
-		}
-		
-		# Parsing span elements, including code spans, character escapes, 
-		# and inline HTML tags, so that pipes inside those gets ignored.
-		$head		= $this->parseSpan($head);
-		$headers	= preg_split('/ *[|] */', $head);
-		$col_count	= count($headers);
-		$attr       = array_pad($attr, $col_count, '');
-		
-		# Write column headers.
-		$text = "\n";
-		$text .= "\n";
-		$text .= "\n";
-		foreach ($headers as $n => $header)
-			$text .= "  ".$this->runSpanGamut(trim($header))."\n";
-		$text .= "\n";
-		$text .= "\n";
-		
-		# Split content by row.
-		$rows = explode("\n", trim($content, "\n"));
-		
-		$text .= "\n";
-		foreach ($rows as $row) {
-			# Parsing span elements, including code spans, character escapes, 
-			# and inline HTML tags, so that pipes inside those gets ignored.
-			$row = $this->parseSpan($row);
-			
-			# Split row by cell.
-			$row_cells = preg_split('/ *[|] */', $row, $col_count);
-			$row_cells = array_pad($row_cells, $col_count, '');
-			
-			$text .= "\n";
-			foreach ($row_cells as $n => $cell)
-				$text .= "  ".$this->runSpanGamut(trim($cell))."\n";
-			$text .= "\n";
-		}
-		$text .= "\n";
-		$text .= "
    ";
-		
-		return $this->hashBlock($text) . "\n";
-	}
-
-	
-	protected function doDefLists($text) {
-	#
-	# Form HTML definition lists.
-	#
-		$less_than_tab = $this->tab_width - 1;
-
-		# Re-usable pattern to match any entire dl list:
-		$whole_list_re = '(?>
-			(								# $1 = whole list
-			  (								# $2
-				[ ]{0,'.$less_than_tab.'}
-				((?>.*\S.*\n)+)				# $3 = defined term
-				\n?
-				[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
-			  )
-			  (?s:.+?)
-			  (								# $4
-				  \z
-				|
-				  \n{2,}
-				  (?=\S)
-				  (?!						# Negative lookahead for another term
-					[ ]{0,'.$less_than_tab.'}
-					(?: \S.*\n )+?			# defined term
-					\n?
-					[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
-				  )
-				  (?!						# Negative lookahead for another definition
-					[ ]{0,'.$less_than_tab.'}:[ ]+ # colon starting definition
-				  )
-			  )
-			)
-		)'; // mx
-
-		$text = preg_replace_callback('{
-				(?>\A\n?|(?<=\n\n))
-				'.$whole_list_re.'
-			}mx',
-			array($this, '_doDefLists_callback'), $text);
-
-		return $text;
-	}
-	protected function _doDefLists_callback($matches) {
-		# Re-usable patterns to match list item bullets and number markers:
-		$list = $matches[1];
-		
-		# Turn double returns into triple returns, so that we can make a
-		# paragraph for the last item in a list, if necessary:
-		$result = trim($this->processDefListItems($list));
-		$result = "
    \n" . $result . "\n
    ";
-		return $this->hashBlock($result) . "\n\n";
-	}
-
-
-	protected function processDefListItems($list_str) {
-	#
-	#	Process the contents of a single definition list, splitting it
-	#	into individual term and definition list items.
-	#
-		$less_than_tab = $this->tab_width - 1;
-		
-		# trim trailing blank lines:
-		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
-
-		# Process definition terms.
-		$list_str = preg_replace_callback('{
-			(?>\A\n?|\n\n+)					# leading line
-			(								# definition terms = $1
-				[ ]{0,'.$less_than_tab.'}	# leading whitespace
-				(?!\:[ ]|[ ])				# negative lookahead for a definition
-											#   mark (colon) or more whitespace.
-				(?> \S.* \n)+?				# actual term (not whitespace).	
-			)			
-			(?=\n?[ ]{0,3}:[ ])				# lookahead for following line feed 
-											#   with a definition mark.
-			}xm',
-			array($this, '_processDefListItems_callback_dt'), $list_str);
-
-		# Process actual definitions.
-		$list_str = preg_replace_callback('{
-			\n(\n+)?						# leading line = $1
-			(								# marker space = $2
-				[ ]{0,'.$less_than_tab.'}	# whitespace before colon
-				\:[ ]+						# definition mark (colon)
-			)
-			((?s:.+?))						# definition text = $3
-			(?= \n+ 						# stop at next definition mark,
-				(?:							# next term or end of text
-					[ ]{0,'.$less_than_tab.'} \:[ ]	|
-					
     | \z
-				)						
-			)					
-			}xm',
-			array($this, '_processDefListItems_callback_dd'), $list_str);
-
-		return $list_str;
-	}
-	protected function _processDefListItems_callback_dt($matches) {
-		$terms = explode("\n", trim($matches[1]));
-		$text = '';
-		foreach ($terms as $term) {
-			$term = $this->runSpanGamut(trim($term));
-			$text .= "\n
    " . $term . "
    ";
-		}
-		return $text . "\n";
-	}
-	protected function _processDefListItems_callback_dd($matches) {
-		$leading_line	= $matches[1];
-		$marker_space	= $matches[2];
-		$def			= $matches[3];
-
-		if ($leading_line || preg_match('/\n{2,}/', $def)) {
-			# Replace marker with the appropriate whitespace indentation
-			$def = str_repeat(' ', strlen($marker_space)) . $def;
-			$def = $this->runBlockGamut($this->outdent($def . "\n\n"));
-			$def = "\n". $def ."\n";
-		}
-		else {
-			$def = rtrim($def);
-			$def = $this->runSpanGamut($this->outdent($def));
-		}
-
-		return "\n
    " . $def . "
    \n";
-	}
-
-
-	protected function doFencedCodeBlocks($text) {
-	#
-	# Adding the fenced code block syntax to regular Markdown:
-	#
-	# ~~~
-	# Code block
-	# ~~~
-	#
-		$less_than_tab = $this->tab_width;
-		
-		$text = preg_replace_callback('{
-				(?:\n|\A)
-				# 1: Opening marker
-				(
-					~{3,} # Marker: three tilde or more.
-				)
-				[ ]*
-				(?:
-					\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
-				|
-					'.$this->id_class_attr_catch_re.' # 3: Extra attributes
-				)?
-				[ ]* \n # Whitespace and newline following marker.
-				
-				# 4: Content
-				(
-					(?>
-						(?!\1 [ ]* \n)	# Not a closing marker.
-						.*\n+
-					)+
-				)
-				
-				# Closing marker.
-				\1 [ ]* \n
-			}xm',
-			array($this, '_doFencedCodeBlocks_callback'), $text);
-
-		return $text;
-	}
-	protected function _doFencedCodeBlocks_callback($matches) {
-		$classname =& $matches[2];
-		$attrs     =& $matches[3];
-		$codeblock = $matches[4];
-		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
-		$codeblock = preg_replace_callback('/^\n+/',
-			array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
-
-		if ($classname != "") {
-			if ($classname{0} == '.')
-				$classname = substr($classname, 1);
-			$attr_str = ' class="'.$this->code_class_prefix.$classname.'"';
-		} else {
-			$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs);
-		}
-		$pre_attr_str  = $this->code_attr_on_pre ? $attr_str : '';
-		$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
-		$codeblock  = "$codeblock
    ";
-		
-		return "\n\n".$this->hashBlock($codeblock)."\n\n";
-	}
-	protected function _doFencedCodeBlocks_newlines($matches) {
-		return str_repeat("empty_element_suffix", 
-			strlen($matches[0]));
-	}
-
-
-	#
-	# Redefining emphasis markers so that emphasis by underscore does not
-	# work in the middle of a word.
-	#
-	protected $em_relist = array(
-		''  => '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? '(?:(? '(?<=\S|^)(? '(?<=\S|^)(? tags
-	#
-		# Strip leading and trailing lines:
-		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
-		
-		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
-
-		#
-		# Wrap 
     tags and unhashify HTML blocks
-		#
-		foreach ($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.
-			$is_p = !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
-			
-			if ($is_p) {
-				$value = "
    $value
    ";
-			}
-			$grafs[$key] = $value;
-		}
-		
-		# Join grafs in one text, then unhash HTML tags. 
-		$text = implode("\n\n", $grafs);
-		
-		# Finish by removing any tag hashes still present in $text.
-		$text = $this->unhash($text);
-		
-		return $text;
-	}
-	
-	
-	### Footnotes
-	
-	protected function stripFootnotes($text) {
-	#
-	# Strips link definitions from text, stores the URLs and titles in
-	# hash references.
-	#
-		$less_than_tab = $this->tab_width - 1;
-
-		# Link defs are in the form: [^id]: url "optional title"
-		$text = preg_replace_callback('{
-			^[ ]{0,'.$less_than_tab.'}\[\^(.+?)\][ ]?:	# note_id = $1
-			  [ ]*
-			  \n?					# maybe *one* newline
-			(						# text = $2 (no blank lines allowed)
-				(?:					
-					.+				# actual text
-				|
-					\n				# newlines but 
-					(?!\[\^.+?\]:\s)# negative lookahead for footnote marker.
-					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed 
-									# by non-indented content
-				)*
-			)		
-			}xm',
-			array($this, '_stripFootnotes_callback'),
-			$text);
-		return $text;
-	}
-	protected function _stripFootnotes_callback($matches) {
-		$note_id = $this->fn_id_prefix . $matches[1];
-		$this->footnotes[$note_id] = $this->outdent($matches[2]);
-		return ''; # String that will replace the block
-	}
-
-
-	protected function doFootnotes($text) {
-	#
-	# Replace footnote references in $text [^id] with a special text-token 
-	# which will be replaced by the actual footnote marker in appendFootnotes.
-	#
-		if (!$this->in_anchor) {
-			$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
-		}
-		return $text;
-	}
-
-	
-	protected function appendFootnotes($text) {
-	#
-	# Append footnote list to text.
-	#
-		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
-			array($this, '_appendFootnotes_callback'), $text);
-	
-		if (!empty($this->footnotes_ordered)) {
-			$text .= "\n\n";
-			$text .= "
    \n";
-			$text .= "empty_element_suffix ."\n";
-			$text .= "
      \n\n";
-			
-			$attr = " rev=\"footnote\"";
-			if ($this->fn_backlink_class != "") {
-				$class = $this->fn_backlink_class;
-				$class = $this->encodeAttribute($class);
-				$attr .= " class=\"$class\"";
-			}
-			if ($this->fn_backlink_title != "") {
-				$title = $this->fn_backlink_title;
-				$title = $this->encodeAttribute($title);
-				$attr .= " title=\"$title\"";
-			}
-			$num = 0;
-			
-			while (!empty($this->footnotes_ordered)) {
-				$footnote = reset($this->footnotes_ordered);
-				$note_id = key($this->footnotes_ordered);
-				unset($this->footnotes_ordered[$note_id]);
-				$ref_count = $this->footnotes_ref_count[$note_id];
-				unset($this->footnotes_ref_count[$note_id]);
-				unset($this->footnotes[$note_id]);
-				
-				$footnote .= "\n"; # Need to append newline before parsing.
-				$footnote = $this->runBlockGamut("$footnote\n");				
-				$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}', 
-					array($this, '_appendFootnotes_callback'), $footnote);
-				
-				$attr = str_replace("%%", ++$num, $attr);
-				$note_id = $this->encodeAttribute($note_id);
-
-				# Prepare backlink, multiple backlinks if multiple references
-				$backlink = "↩";
-				for ($ref_num = 2; $ref_num <= $ref_count; ++$ref_num) {
-					$backlink .= " ↩";
-				}
-				# Add backlink to last paragraph; create new paragraph if needed.
-				if (preg_match('{
      $}', $footnote)) {
-					$footnote = substr($footnote, 0, -4) . " $backlink
      ";
-				} else {
-					$footnote .= "\n\n
      $backlink
      ";
-				}
-				
-				$text .= "
    1. \n";
-				$text .= $footnote . "\n";
-				$text .= "
      2. \n\n";
-			}
-			
-			$text .= "
    \n";
-			$text .= "
    ";
-		}
-		return $text;
-	}
-	protected function _appendFootnotes_callback($matches) {
-		$node_id = $this->fn_id_prefix . $matches[1];
-		
-		# Create footnote marker only if it has a corresponding footnote *and*
-		# the footnote hasn't been used by another marker.
-		if (isset($this->footnotes[$node_id])) {
-			$num =& $this->footnotes_numbers[$node_id];
-			if (!isset($num)) {
-				# Transfer footnote content to the ordered list and give it its
-				# number
-				$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
-				$this->footnotes_ref_count[$node_id] = 1;
-				$num = $this->footnote_counter++;
-				$ref_count_mark = '';
-			} else {
-				$ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
-			}
-
-			$attr = "";
-			if ($this->fn_link_class != "") {
-				$class = $this->fn_link_class;
-				$class = $this->encodeAttribute($class);
-				$attr .= " class=\"$class\"";
-			}
-			if ($this->fn_link_title != "") {
-				$title = $this->fn_link_title;
-				$title = $this->encodeAttribute($title);
-				$attr .= " title=\"$title\"";
-			}
-			
-			$attr = str_replace("%%", $num, $attr);
-			$node_id = $this->encodeAttribute($node_id);
-			
-			return
-				"".
-				"$num".
-				"";
-		}
-		
-		return "[^".$matches[1]."]";
-	}
-		
-	
-	### Abbreviations ###
-	
-	protected function stripAbbreviations($text) {
-	#
-	# Strips abbreviations from text, stores titles in hash references.
-	#
-		$less_than_tab = $this->tab_width - 1;
-
-		# Link defs are in the form: [id]*: url "optional title"
-		$text = preg_replace_callback('{
-			^[ ]{0,'.$less_than_tab.'}\*\[(.+?)\][ ]?:	# abbr_id = $1
-			(.*)					# text = $2 (no blank lines allowed)	
-			}xm',
-			array($this, '_stripAbbreviations_callback'),
-			$text);
-		return $text;
-	}
-	protected function _stripAbbreviations_callback($matches) {
-		$abbr_word = $matches[1];
-		$abbr_desc = $matches[2];
-		if ($this->abbr_word_re)
-			$this->abbr_word_re .= '|';
-		$this->abbr_word_re .= preg_quote($abbr_word);
-		$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
-		return ''; # String that will replace the block
-	}
-	
-	
-	protected function doAbbreviations($text) {
-	#
-	# Find defined abbreviations in text and wrap them in  elements.
-	#
-		if ($this->abbr_word_re) {
-			// cannot use the /x modifier because abbr_word_re may 
-			// contain significant spaces:
-			$text = preg_replace_callback('{'.
-				'(?abbr_word_re.')'.
-				'(?![\w\x1A])'.
-				'}', 
-				array($this, '_doAbbreviations_callback'), $text);
-		}
-		return $text;
-	}
-	protected function _doAbbreviations_callback($matches) {
-		$abbr = $matches[0];
-		if (isset($this->abbr_desciptions[$abbr])) {
-			$desc = $this->abbr_desciptions[$abbr];
-			if (empty($desc)) {
-				return $this->hashPart("$abbr");
-			} else {
-				$desc = $this->encodeAttribute($desc);
-				return $this->hashPart("$abbr");
-			}
-		} else {
-			return $matches[0];
-		}
-	}
-
-}
-
-// https://github.com/egil/php-markdown-extra-extended
-class MarkdownExtraExtended extends MarkdownExtra {
-	# Tags that are always treated as block tags:
-	protected $block_tags_re = 'figure|figcaption|p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend';
-		
-	public function __construct() {
-        /*
-		$this->block_gamut += array(
-			"doFencedFigures"   => 7
-		);
-        */
-
-        $this->document_gamut += array(
-            "doClearBreaks"     =>  100
-        );
-		
-		parent::__construct();
-	}
-
-    public static function defaultTransform($text) {
-		# try to take parser from the static parser list
-		static $parser;
-
-		# create the parser it not already set
-		if (!$parser) {
-			$parser = new MarkdownExtraExtended();
-        }
-
-		# Transform text using parser.
-		return $parser->transform($text);
-	}
-	
-	public function doHardBreaks($text) {
-		# Do hard breaks:
-		# EXTENDED: changed to allow breaks without two spaces and just one new line
-		# original code /* return preg_replace_callback('/ {2,}\n/', */
-		return preg_replace_callback('/ *\n/', 
-			array($this, '_doHardBreaks_callback'), $text);
-	}
-
-    public function doClearBreaks($text) {
-        return preg_replace("/\s*((?:
    \n)+)\s*(<\/?(?:$this->block_tags_re|li|dd|dt)[^\d])/is",
-            "\\2", $text);
-    }
-
-
-	public function doBlockQuotes($text) {
-		$text = preg_replace_callback('/
-			(?>^[ ]*>[ ]?
-				(?:\((.+?)\))?
-				[ ]*(.+\n(?:.+\n)*)
-			)+	
-			/xm',
-			array($this, '_doBlockQuotes_callback'), $text);
-
-		return $text;
-	}
-	
-	public function _doBlockQuotes_callback($matches) {
-		$cite = $matches[1];
-		$bq = '> ' . $matches[2];
-		# trim one level of quoting - trim whitespace-only lines
-		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
-		$bq = $this->runBlockGamut($bq);		# recurse
-
-		$bq = preg_replace('/^/m', "  ", $bq);
-		# These leading spaces cause problem with 
     content, 
-		# so we need to fix that:
-		$bq = preg_replace_callback('{(\s*
    .+?
    )}sx', 
-			array($this, '_doBlockQuotes_callback2'), $bq);
-		
-		$res = "" : " cite=\"$cite\">";
-		$res .= "\n$bq\n";
-		return "\n". $this->hashBlock($res)."\n\n";
-	}
-
-	public function doFencedCodeBlocks($text) {
-		$less_than_tab = $this->tab_width;
-		
-		$text = preg_replace_callback('{
-				(?:\n|\A)
-				# 1: Opening marker
-				(
-					~{3,}|`{3,} # Marker: three tilde or more.
-				)
-				
-				[ ]?(\w+)?(?:,[ ]?(\d+))?[ ]* \n # Whitespace and newline following marker.
-				
-				# 3: Content
-				(
-					(?>
-						(?!\1 [ ]* \n)	# Not a closing marker.
-						.*\n+
-					)+
-				)
-				
-				# Closing marker.
-				\1 [ ]* \n
-			}xm',
-			array($this, '_doFencedCodeBlocks_callback'), $text);
-
-		return $text;
-	}
-	
-	public function _doFencedCodeBlocks_callback($matches) {
-		$codeblock = $this->unhash($matches[4]);
-		$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
-		$codeblock = preg_replace_callback('/^\n+/',
-			array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
-		//$codeblock = "
    $codeblock
    ";
-		//$cb = "
    " : " class=\"lang-$matches[2]\">";
-		$cb .= "$codeblock
    ";
-		return "\n\n".$this->hashBlock($cb)."\n\n";
-	}
-
-	public function doFencedFigures($text){
-		$text = preg_replace_callback('{
-			(?:\n|\A)
-			# 1: Opening marker
-			(
-				={3,} # Marker: equal sign.
-			)
-			
-			[ ]?(?:\[([^\]]+)\])?[ ]* \n # Whitespace and newline following marker.
-			
-			# 3: Content
-			(
-				(?>
-					(?!\1 [ ]?(?:\[([^\]]+)\])?[ ]* \n)	# Not a closing marker.
-					.*\n+
-				)+
-			)
-			
-			# Closing marker.
-			\1 [ ]?(?:\[([^\]]+)\])?[ ]* \n
-		}xm', array($this, '_doFencedFigures_callback'), $text);		
-		
-		return $text;	
-	}
-	
-	public function _doFencedFigures_callback($matches) {
-		# get figcaption
-		$topcaption = empty($matches[2]) ? null : $this->runBlockGamut($matches[2]);
-		$bottomcaption = empty($matches[5]) ? null : $this->runBlockGamut($matches[5]);
-		$figure = $matches[3];
-		$figure = $this->runBlockGamut($figure); # recurse
-
-		$figure = preg_replace('/^/m', "  ", $figure);
-		# These leading spaces cause problem with 
     content, 
-		# so we need to fix that - reuse blockqoute code to handle this:
-		$figure = preg_replace_callback('{(\s*
    .+?
    )}sx', 
-			array($this, '_doBlockQuotes_callback2'), $figure);
-		
-		$res = "
    ";
-		if(!empty($topcaption)){
-			$res .= "\n
    $topcaption
    ";
-		}
-		$res .= "\n$figure\n";
-		if(!empty($bottomcaption) && empty($topcaption)){
-			$res .= "
    $bottomcaption
    ";
-		}
-		$res .= "
    ";		
-		return "\n". $this->hashBlock($res)."\n\n";
-	}
-}
-