commit 0843d76b495769fb1929af9cda136efa86d9ff6b Author: speedie Date: Mon Jan 30 15:26:06 2023 +0100 add speedie.gq wiki diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..f7bd968 --- /dev/null +++ b/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2013 Steven Frank + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/config.php b/config.php new file mode 100644 index 0000000..5c31aaa --- /dev/null +++ b/config.php @@ -0,0 +1,173 @@ + + * Code may be re-used as long as the above copyright notice is retained. + * See README.txt for full details. + * + * Written with Coda: + * + */ + +// -------------------- +// Site layout settings +// -------------------- + +// BASE_PATH +// +// The base system path to W2. You only need to change this if we guess wrong. +// You should not use a trailing slash. + +define('BASE_PATH', getcwd()); + +// PAGES_PATH +// +// The path to the raw text documents maintained by W2 +// You should not use a trailing slash. + +define('PAGES_PATH', BASE_PATH . '/pages'); + +// BASE_URI +// +// The base URI for this W2 installation. You only need to change this if we guess wrong. +// You should not use a trailing slash. + +define('BASE_URI', str_replace('/index.php', '', $_SERVER['SCRIPT_NAME'])); + +// SELF +// +// The path component of the URL to the main script, such as: /w2/index.php + +define('SELF', $_SERVER['SCRIPT_NAME']); + +// VIEW +// +// Needed only if your web server spawns PHP as a CGI instead of an internal module. +// For example: define('VIEW', '?action=view&page='); + +define('VIEW', ''); + +// DEFAULT_PAGE +// +// The name of the page to show as the "Home" page. +// Value is a string, the title of a page (case-sensitive!) + +define('DEFAULT_PAGE', 'Home'); + +// CSS_FILE +// +// The CSS file to load to style the wiki, relative to BASE_URI + +define('CSS_FILE', 'index.css'); + +// -------------------- +// File upload settings +// -------------------- + +// DISABLE_UPLOADS +// +// Globally enable/disable file uploads + +define('DISABLE_UPLOADS', false); + +// VALID_UPLOAD_TYPES +// +// Acceptable file types for file uploads. This is a good idea for security. +// Value is a comma-separated string of MIME types. + +define('VALID_UPLOAD_TYPES', 'image/jpeg,image/pjpeg,image/png,image/gif,application/pdf,application/zip,application/x-diskcopy'); + +// VALID_UPLOAD_EXTS +// +// Acceptable filename extensions for file uploads +// Value is a comma-separated string of filename extensions (case-sensitive!) + +define('VALID_UPLOAD_EXTS', 'jpg,jpeg,png,gif,pdf,zip,dmg'); + +// ------------------ +// Interface settings +// ------------------ + +// TITLE_DATE +// +// The format to use when displaying page modification times. +// See the manual for the PHP 'date()' function for the specification: +// http://php.net/manual/en/function.date.php + +define('TITLE_DATE', 'j-M-Y g:i A'); +define('TITLE_DATE_NO_TIME', 'j-M-Y'); + +// EDIT_ROWS +// +// Default size of the text editing area in text rows. + +define('EDIT_ROWS', 18); + +// AUTOLINK_PAGE_TITLES +// +// Automatically converts any page titles appearing in text into links +// to the named page. This might degrade performance if you have many +// thousands of pages. + +define('AUTOLINK_PAGE_TITLES', false); + +// COLORIZE_MISSING_PAGES +// +// Automatically highlights as red links, any linked pages which are +// not yet written. Existing but blank pages are not colorized. This +// might degrade performance if you have thousands of links on a page. + +define('COLORIZE_MISSING_PAGES', true); + +// ----------------------------- +// Security and session settings +// ----------------------------- + +// REQUIRE_PASSWORD +// +// Is a password required to access this wiki? + +define('REQUIRE_PASSWORD', false); + +// W2_PASSWORD +// +// The password for the wiki, if REQUIRE_PASSWORD is true +// Replace 'secret' with your password to set your password. + +define('W2_PASSWORD', 'secret'); + +// W2_PASSWORD_HASH +// +// Alternate (more secure) password storage. +// To use a hashed password, Comment out the W2_PASSWORD definition above and uncomment +// this one, using the result of sha1('your_password') as the value. +// +// In Mac OS X, you can do this from the Terminal: +// echo -n 'your_password' | openssl sha1 +// +// define('W2_PASSWORD_HASH', 'e5e9fa1ba31ecd1ae84f75caaa474f3a663f05f4'); + +define('W2_PASSWORD_HASH', ''); + +// allowedIPs +// +// A whitelist of IP addresses that are allowed access to the wiki. +// If empty, all IPs are allowed. + +$allowedIPs = array(); + +// W2_SESSION_LIFETIME +// +// How long before a login session expires? Default is 30 days + +define('W2_SESSION_LIFETIME', 60 * 60 * 24 * 30); + +// W2_SESSION_NAME +// +// Name for session (used in the cookie) + +define('W2_SESSION_NAME', 'W2'); + +?> diff --git a/index.css b/index.css new file mode 100644 index 0000000..0024ed2 --- /dev/null +++ b/index.css @@ -0,0 +1,184 @@ +/* + * W2 + * + * Copyright (C) 2007-2011 Steven Frank + * + * Code may be re-used as long as the above copyright notice is retained. + * See README.txt for full details. + * + * Written with Coda: + * + */ + +.main { + background-color: #000000; + color: #ffffff; +} + +body { + background-color: #000000; +} + +* { + font-family: Monospace; + font-size: 11px; + margin: 0; + padding: 0; +} + +a { + color: #6666ff; +} + +blockquote { + background-color: #0f070f; + margin: 0px 0px 12px 20px; + padding-top: 4px 10px 4px 10px; +} + +form { + display: inline; +} + +li { + line-height: 1.5em; +} + +h1 { + font-size: 20px; + font-weight: bold; + margin-bottom: 8px; +} + +h2 { + font-size: 16px; + font-weight: bold; + margin-bottom: 8px; +} + +h3 { + font-size: 13px; + font-weight: bold; + margin-bottom: 8px; +} + +hr { + border-top: 1px solid #222222; + border-bottom: 0; + border-left: 0; + border-right: 0; + margin-top: 12px; + margin-bottom: 12px; +} + +ul { + padding-left: 12px; + margin-left: 12px; + margin-bottom: 12px; + list-style-position: inside; +} + +ol { + margin-left: 12px; + margin-bottom: 12px; + padding-left: 12px; + list-style-position: inside; +} + +p { + margin: 12px 12px 12px 12px; +} + +pre { + font-family: Monospace, monospace; + font-size: 11px; + margin-left: 12px; + margin-bottom: 12px; + + /* stroke each browser so that they wrap lines in the pre tag */ + white-space: pre-wrap; /* css-3 */ + white-space: -moz-pre-wrap; /* Mozilla, since 1999 */ + white-space: -pre-wrap; /* Opera 4-6 */ + white-space: -o-pre-wrap; /* Opera 7 */ + word-wrap: break-word; /* Internet Explorer 5.5+ */ +} + +code { + font-family: Monospace, monospace; + font-size: 11px; +} + +table { + border-collapse: collapse; +} + +table, td { + background-color: #000000; + padding: 2px; +} + +textarea { + font-family: Monospace, Courier, monospace; + font-size: 11px; + width: 99%; + background-color: #000011; + color: #ffffff; +} + +.main { + padding: 8px; +} + +.note { + background-color: #000011; + padding: 4px; + margin: 0 8px 8px 8px; + color: #9999bb; + border: solid 1px #9999bb; +} + +.titlebar { + background-color: #111111; + color: #ffffff; + font-size: 10px; + font-weight: bold; +} + +.titledate { + font-size: 10px; + color: #777777; +} + +.toolbar { + background-color: #222222; + position: sticky; + top: 0; + font-size: 8px; +} + +a.tool { + font-size: 11px; + margin-right: 8px; + color: #eeeeee; +} + +a.missing-link { + color: #ed123e; +} + +input { + background-color: #111111; + color: #ffffff; + +} + +input.tool { + font-size: 11px; + background-color: #222222; + color: #ffffff; +} + +img { + max-width: 50%; + height: auto; +} diff --git a/index.php b/index.php new file mode 100644 index 0000000..cc6e599 --- /dev/null +++ b/index.php @@ -0,0 +1,555 @@ + + * + * Code may be re-used as long as the above copyright notice is retained. + * See README.txt for full details. + * + * Written with Coda: + * + */ + +// Install PSR-4-compatible class autoloader +spl_autoload_register(function($class){ + require str_replace('\\', DIRECTORY_SEPARATOR, ltrim($class, '\\')).'.php'; +}); + + +// Get Markdown class +use mdlibs\MarkdownExtra; + + +// User configurable options: + +include_once "config.php"; + +ini_set('session.gc_maxlifetime', W2_SESSION_LIFETIME); + +session_set_cookie_params(W2_SESSION_LIFETIME); +session_name(W2_SESSION_NAME); +session_start(); + +if ( count($allowedIPs) > 0 ) +{ + $ip = $_SERVER['REMOTE_ADDR']; + $accepted = false; + + foreach ( $allowedIPs as $allowed ) + { + if ( strncmp($allowed, $ip, strlen($allowed)) == 0 ) + { + $accepted = true; + break; + } + } + + if ( !$accepted ) + { + print "Access from IP address $ip is not allowed"; + print ""; + exit; + } +} + +if ( REQUIRE_PASSWORD && !isset($_SESSION['password']) ) +{ + if ( !defined('W2_PASSWORD_HASH') || W2_PASSWORD_HASH == '' ) + define('W2_PASSWORD_HASH', sha1(W2_PASSWORD)); + + if ( (isset($_POST['p'])) && (sha1($_POST['p']) == W2_PASSWORD_HASH) ) + $_SESSION['password'] = W2_PASSWORD_HASH; + else + { + print "\n"; + print "\n"; + print "\n"; + print ""; + print "\n"; + + print "\n"; + print "Log In\n"; + print "\n"; + print "
"; + print "\n"; + print "
"; + print ""; + exit; + } +} + +// Support functions + +function _handle_links($match) +{ + $link = $match[1]; + if ( COLORIZE_MISSING_PAGES ) { + $link_page = sanitizeFilename($link); + $link_filename = PAGES_PATH . "/$link_page.txt"; + $link_page_exists = file_exists($link_filename); + } else { + $link_page_exists = true; + } + if ($link_page_exists) + return "" . htmlentities($link) . ""; + else + return "" . htmlentities($link) . ""; +} + + +function _handle_images($match) +{ + return "\"""; +} + + +function _handle_message($match) +{ + return "[email]"; +} + + +function printToolbar() +{ + global $upage, $page, $action; + + print "
"; + print "Edit "; + print "New "; + + if ( !DISABLE_UPLOADS ) + print "Upload "; + + print "All "; + print "Recent "; + print "". DEFAULT_PAGE . ""; + + if ( REQUIRE_PASSWORD ) + print 'Exit'; + + print "
\n"; + print "
\n"; + + print "
\n"; +} + + +function descLengthSort($val_1, $val_2) +{ + $retVal = 0; + + $firstVal = strlen($val_1); + $secondVal = strlen($val_2); + + if ( $firstVal > $secondVal ) + $retVal = -1; + + else if ( $firstVal < $secondVal ) + $retVal = 1; + + return $retVal; +} + + +function toHTML($inText) +{ + global $page; + + $inText = preg_replace("/<[\/]*script>/", "", $inText); + + $dir = opendir(PAGES_PATH); + while ( $filename = readdir($dir) ) + { + if ( $filename[0] == '.' ) + continue; + + $filename = preg_replace("/(.*?)\.txt/", "\\1", $filename); + $filenames[] = $filename; + } + closedir($dir); + + uasort($filenames, "descLengthSort"); + + if ( AUTOLINK_PAGE_TITLES ) + { + foreach ( $filenames as $filename ) + { + $inText = preg_replace("/(?\[\/])($filename)(?!\]\>)/im", "\\1", $inText); + } + } + + $inText = preg_replace_callback("/\[\[(.*?)\]\]/", '_handle_links', $inText); + $inText = preg_replace_callback("/\{\{(.*?)\}\}/", '_handle_images', $inText); + $inText = preg_replace_callback("/message:(.*?)\s/", '_handle_message', $inText); + + $html = MarkdownExtra::defaultTransform($inText); + $inText = htmlentities($inText); + + return $html; +} + +function sanitizeFilename($inFileName) +{ + return str_replace(array('..', '~', '/', '\\', ':'), '-', $inFileName); +} + +function destroy_session() +{ + if ( isset($_COOKIE[session_name()]) ) + setcookie(session_name(), '', time() - 42000, '/'); + + session_destroy(); + unset($_SESSION["password"]); + unset($_SESSION); +} + +// Support PHP4 by defining file_put_contents if it doesn't already exist + +if ( !function_exists('file_put_contents') ) +{ + function file_put_contents($n, $d) + { + $f = @fopen($n, "w"); + + if ( !$f ) + { + return false; + } + else + { + fwrite($f, $d); + fclose($f); + return true; + } + } +} +// Support PHP 8.1 by setting two predefined variables to empty strings if +// not already defined. Fixes a bunch of deprecation warnings. + +if (!isset($_SERVER["PATH_INFO"])) + $_SERVER["PATH_INFO"] = ''; +if (!isset($_REQUEST['page'])) + $_REQUEST['page'] = ''; + + +// Main code + +if ( isset($_REQUEST['action']) ) + $action = $_REQUEST['action']; +else + $action = 'view'; + +// Look for page name following the script name in the URL, like this: +// http://stevenf.com/w2demo/index.php/Markdown%20Syntax +// +// Otherwise, get page name from 'page' request variable. + +if ( preg_match('@^/@', @$_SERVER["PATH_INFO"]) ) + $page = sanitizeFilename(substr($_SERVER["PATH_INFO"], 1)); +else + $page = sanitizeFilename(@$_REQUEST['page']); + +$upage = urlencode($page); + +if ( $page == "" ) + $page = DEFAULT_PAGE; + +$filename = PAGES_PATH . "/$page.txt"; + +if ( file_exists($filename) ) +{ + $text = file_get_contents($filename); +} +else +{ + if ( $action != "save" && $action != "all_name" && $action != "all_date" && $action != "upload" && $action != "new" && $action != "logout" && $action != "uploaded" && $action != "search" && $action != "view" ) + { + $action = "edit"; + } +} + +if ( $action == "edit" || $action == "new" ) +{ + $formAction = SELF . (($action == 'edit') ? "/$page" : ""); + $html = "
\n"; + + if ( $action == "edit" ) + $html .= "\n"; + else + $html .= "

Title:

\n"; + + if ( $action == "new" ) + $text = ""; + + $html .= "

\n"; + $html .= "

"; + $html .= "\n"; + $html .= "

\n"; + $html .= "
\n"; +} +else if ( $action == "logout" ) +{ + destroy_session(); + header("Location: " . SELF); + exit; +} +else if ( $action == "upload" ) +{ + if ( DISABLE_UPLOADS ) + { + $html = "

Image uploading has been disabled on this installation.

"; + } + else + { + $html = "

\n"; + $html .= ""; + $html .= "\n"; + $html .= "\n"; + $html .= "\n"; + $html .= "

\n"; + } +} +else if ( $action == "uploaded" ) +{ + if ( !DISABLE_UPLOADS ) + { + $dstName = sanitizeFilename($_FILES['userfile']['name']); + $fileType = $_FILES['userfile']['type']; + preg_match('/\.([^.]+)$/', $dstName, $matches); + $fileExt = isset($matches[1]) ? $matches[1] : null; + + if (in_array($fileType, explode(',', VALID_UPLOAD_TYPES)) && + in_array($fileExt, explode(',', VALID_UPLOAD_EXTS))) + { + $errLevel = error_reporting(0); + + if ( move_uploaded_file($_FILES['userfile']['tmp_name'], + BASE_PATH . "/images/$dstName") === true ) + { + $html = "

File '$dstName' uploaded

\n"; + } + else + { + $html = "

Upload error

\n"; + } + + error_reporting($errLevel); + } else { + $html = "

Upload error: invalid file type

\n"; + } + } + + $html .= toHTML($text); +} +else if ( $action == "save" ) +{ + $newText = $_REQUEST['newText']; + + $errLevel = error_reporting(0); + $success = file_put_contents($filename, $newText); + error_reporting($errLevel); + + if ( $success ) + $html = "

Saved

\n"; + else + $html = "

Error saving changes! Make sure your web server has write access to " . PAGES_PATH . "

\n"; + + $html .= toHTML($newText); +} +/* +else if ( $action == "rename" ) +{ + $html = "
"; + $html .= "

Title: "; + $html .= ""; + $html .= "\n"; + $html .= ""; + $html .= ""; + $html .= "

"; +} +else if ( $action == "renamed" ) +{ + $pp = $_REQUEST['prevpage']; + $pg = $_REQUEST['page']; + + $prevpage = sanitizeFilename($pp); + $prevpage = urlencode($prevpage); + + $prevfilename = PAGES_PATH . "/$prevpage.txt"; + + if ( rename($prevfilename, $filename) ) + { + // Success. Change links in all pages to point to new page + if ( $dh = opendir(PAGES_PATH) ) + { + while ( ($file = readdir($dh)) !== false ) + { + $content = file_get_contents($file); + $pattern = "/\[\[" . $pp . "\]\]/g"; + preg_replace($pattern, "[[$pg]]", $content); + file_put_contents($file, $content); + } + } + } + else + { + $html = "

Error renaming file

\n"; + } +} +*/ +else if ( $action == "all_name" ) +{ + $dir = opendir(PAGES_PATH); + $filelist = array(); + + $color = "#ffffff"; + + while ( $file = readdir($dir) ) + { + if ( $file[0] == "." ) + continue; + + $afile = preg_replace("/(.*?)\.txt/", "\\1", $file); + $efile = preg_replace("/(.*?)\.txt/", "edit", urlencode($file)); + + array_push($filelist, "$afile$efile"); + + if ( $color == "#ffffff" ) + $color = "#f4f4f4"; + else + $color = "#ffffff"; + } + + closedir($dir); + + natcasesort($filelist); + + $html = ""; + + + for ($i = 0; $i < count($filelist); $i++) + { + $html .= $filelist[$i]; + } + + $html .= "
\n"; +} +else if ( $action == "all_date" ) +{ + $html = "\n"; + $dir = opendir(PAGES_PATH); + $filelist = array(); + while ( $file = readdir($dir) ) + { + if ( $file[0] == "." ) + continue; + + $filelist[preg_replace("/(.*?)\.txt/", "\\1", $file)] = filemtime(PAGES_PATH . "/$file"); + } + + closedir($dir); + + $color = "#ffffff"; + arsort($filelist, SORT_NUMERIC); + + foreach ($filelist as $key => $value) + { + $html .= "\n"; + + if ( $color == "#ffffff" ) + $color = "#f4f4f4"; + else + $color = "#ffffff"; + } + $html .= "
$key" . date(TITLE_DATE_NO_TIME, $value) . "
\n"; +} +else if ( $action == "search" ) +{ + $matches = 0; + $q = $_REQUEST['q']; + $html = "

Search: $q

\n
    \n"; + + if ( trim($q) != "" ) + { + $dir = opendir(PAGES_PATH); + + while ( $file = readdir($dir) ) + { + if ( $file[0] == "." ) + continue; + + $text = file_get_contents(PAGES_PATH . "/$file"); + + if ( preg_match("/{$q}/i", $text) || preg_match("/{$q}/i", $file) ) + { + ++$matches; + $file = preg_replace("/(.*?)\.txt/", "\\1", $file); + $html .= "
  • $file
    • \n"; + } + } + + closedir($dir); + } + + $html .= "
\n"; + $html .= "

$matches matched

\n"; +} +else +{ + $html = toHTML($text); +} + +$datetime = ''; + +if ( ($action == "all_name") || ($action == "all_date")) + $title = "All Pages"; + +else if ( $action == "upload" ) + $title = "Upload Image"; + +else if ( $action == "new" ) + $title = "New"; + +else if ( $action == "search" ) + $title = "Search"; + +else +{ + $title = $page; + + if ( TITLE_DATE ) + { + $datetime = "" . date(TITLE_DATE, @filemtime($filename)) . ""; + } +} + +// Disable caching on the client (the iPhone is pretty agressive about this +// and it can cause problems with the editing function) + +header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1 +header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past + +print "\n"; +print "\n"; +print "\n"; +print ""; +print "\n"; + +print "\n"; +print "$title\n"; +print "\n"; +print "\n"; +print "
$title $datetime
\n"; + +printToolbar(); + +print "
\n"; +print "$html\n"; +print "
\n"; + +print "\n"; +print "\n"; + +?> diff --git a/mdlibs/Markdown.inc.php b/mdlibs/Markdown.inc.php new file mode 100644 index 0000000..e2bd380 --- /dev/null +++ b/mdlibs/Markdown.inc.php @@ -0,0 +1,10 @@ + + * @copyright 2004-2019 Michel Fortin + * @copyright (Original Markdown) 2004-2006 John Gruber + */ + +namespace mdlibs; + +/** + * Markdown Parser Class + */ +class Markdown implements MarkdownInterface { + /** + * Define the package version + * @var string + */ + const MARKDOWNLIB_VERSION = "2.0"; + + /** + * Simple function interface - Initialize the parser and return the result + * of its transform method. This will work fine for derived classes too. + * + * @api + * + * @param string $text + * @return string + */ + public static function defaultTransform($text) { + // Take parser class on which this function was called. + $parser_class = static::class; + + // Try to take parser from the static parser list + static $parser_list; + $parser =& $parser_list[$parser_class]; + + // Create the parser it not already set + if (!$parser) { + $parser = new $parser_class; + } + + // Transform text using parser. + return $parser->transform($text); + } + + /** + * Configuration variables + */ + /** + * Change to ">" for HTML output. + */ + public $empty_element_suffix = " />"; + + /** + * The width of indentation of the output markup + */ + public $tab_width = 4; + + /** + * Change to `true` to disallow markup or entities. + */ + public $no_markup = false; + public $no_entities = false; + + + /** + * Change to `true` to enable line breaks on \n without two trailling spaces + * @var boolean + */ + public $hard_wrap = false; + + /** + * Predefined URLs and titles for reference links and images. + */ + public $predef_urls = array(); + public $predef_titles = array(); + + /** + * Optional filter function for URLs + * @var callable|null + */ + public $url_filter_func = null; + + /** + * Optional header id="" generation callback function. + * @var callable|null + */ + public $header_id_func = null; + + /** + * Optional function for converting code block content to HTML + * @var callable|null + */ + public $code_block_content_func = null; + + /** + * Optional function for converting code span content to HTML. + * @var callable|null + */ + public $code_span_content_func = null; + + /** + * Class attribute to toggle "enhanced ordered list" behaviour + * setting this to true will allow ordered lists to start from the index + * number that is defined first. + * + * For example: + * 2. List item two + * 3. List item three + * + * Becomes: + *
    + *
  1. List item two
    2. + *
  2. List item three
    3. + *
+ */ + public $enhanced_ordered_list = false; + + /** + * 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; + + /** + * Constructor function. Initialize appropriate member variables. + * @return void + */ + public function __construct() { + $this->_initDetab(); + $this->prepareItalicsAndBold(); + + $this->nested_brackets_re = + str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth). + str_repeat('\])*', $this->nested_brackets_depth); + + $this->nested_url_parenthesis_re = + str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth). + str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth); + + $this->escape_chars_re = '['.preg_quote($this->escape_chars).']'; + + // Sort document, block, and span gamut in ascendent priority order. + asort($this->document_gamut); + asort($this->block_gamut); + asort($this->span_gamut); + } + + + /** + * Internal hashes used during transformation. + */ + protected $urls = array(); + protected $titles = array(); + protected $html_hashes = array(); + + /** + * Status flag to avoid invalid nesting. + */ + protected $in_anchor = false; + + /** + * Status flag to avoid invalid nesting. + */ + protected $in_emphasis_processing = false; + + /** + * Called before the transformation process starts to setup parser states. + * @return void + */ + protected function setup() { + // Clear global hashes. + $this->urls = $this->predef_urls; + $this->titles = $this->predef_titles; + $this->html_hashes = array(); + $this->in_anchor = false; + $this->in_emphasis_processing = false; + } + + /** + * Called after the transformation process to clear any variable which may + * be taking up memory unnecessarly. + * @return void + */ + protected function teardown() { + $this->urls = array(); + $this->titles = array(); + $this->html_hashes = array(); + } + + /** + * Main function. Performs some preprocessing on the input text and pass + * it through the document gamut. + * + * @api + * + * @param string $text + * @return string + */ + public function transform($text) { + $this->setup(); + + # Remove UTF-8 BOM and marker character in input, if present. + $text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text); + + # Standardize line endings: + # DOS to Unix and Mac to Unix + $text = preg_replace('{\r\n?}', "\n", $text); + + # Make sure $text ends with a couple of newlines: + $text .= "\n\n"; + + # Convert all tabs to spaces. + $text = $this->detab($text); + + # Turn block-level HTML blocks into hash entries + $text = $this->hashHTMLBlocks($text); + + # Strip any lines consisting only of spaces and tabs. + # This makes subsequent regexen easier to write, because we can + # match consecutive blank lines with /\n+/ instead of something + # contorted like /[ ]*\n+/ . + $text = preg_replace('/^[ ]+$/m', '', $text); + + # Run document gamut methods. + foreach ($this->document_gamut as $method => $priority) { + $text = $this->$method($text); + } + + $this->teardown(); + + return $text . "\n"; + } + + /** + * Define the document gamut + */ + protected $document_gamut = array( + // Strip link definitions, store in hashes. + "stripLinkDefinitions" => 20, + "runBasicBlockGamut" => 30, + ); + + /** + * Strips link definitions from text, stores the URLs and titles in + * hash references + * @param string $text + * @return string + */ + protected function stripLinkDefinitions($text) { + + $less_than_tab = $this->tab_width - 1; + + // Link defs are in the form: ^[id]: url "optional title" + $text = preg_replace_callback('{ + ^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1 + [ ]* + \n? # maybe *one* newline + [ ]* + (?: + <(.+?)> # url = $2 + | + (\S+?) # url = $3 + ) + [ ]* + \n? # maybe one newline + [ ]* + (?: + (?<=\s) # lookbehind for whitespace + ["(] + (.*?) # title = $4 + [")] + [ ]* + )? # title is optional + (?:\n+|\Z) + }xm', + array($this, '_stripLinkDefinitions_callback'), + $text + ); + return $text; + } + + /** + * The callback to strip link definitions + * @param array $matches + * @return string + */ + protected function _stripLinkDefinitions_callback($matches) { + $link_id = strtolower($matches[1]); + $url = $matches[2] == '' ? $matches[3] : $matches[2]; + $this->urls[$link_id] = $url; + $this->titles[$link_id] =& $matches[4]; + return ''; // String that will replace the block + } + + /** + * Hashify HTML blocks + * @param string $text + * @return string + */ + protected function hashHTMLBlocks($text) { + if ($this->no_markup) { + return $text; + } + + $less_than_tab = $this->tab_width - 1; + + /** + * Hashify HTML blocks: + * + * We only want to do this for block-level HTML tags, such as headers, + * lists, and tables. That's because we still want to wrap

s around + * "paragraphs" that are wrapped in non-block-level tags, such as + * anchors, phrase emphasis, and spans. The list of tags we're looking + * for is hard-coded: + * + * * List "a" is made of tags which can be both inline or block-level. + * These will be treated block-level when the start tag is alone on + * its line, otherwise they're not matched here and will be taken as + * inline later. + * * List "b" is made of tags which are always block-level; + */ + $block_tags_a_re = 'ins|del'; + $block_tags_b_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'. + 'script|noscript|style|form|fieldset|iframe|math|svg|'. + 'article|section|nav|aside|hgroup|header|footer|'. + 'figure|details|summary'; + + // Regular expression for the content of a block tag. + $nested_tags_level = 4; + $attr = ' + (?> # optional tag attributes + \s # starts with whitespace + (?> + [^>"/]+ # text outside quotes + | + /+(?!>) # slash not followed by ">" + | + "[^"]*" # text inside double quotes (tolerate ">") + | + \'[^\']*\' # text inside single quotes (tolerate ">") + )* + )? + '; + $content = + str_repeat(' + (?> + [^<]+ # content without tag + | + <\2 # nested opening tag + '.$attr.' # attributes + (?> + /> + | + >', $nested_tags_level). // end of opening tag + '.*?'. // last level nested tag content + str_repeat(' + # 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) # Starting on its own line + | # or + \A\n? # the at 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; + } + + /** + * The callback for hashing HTML blocks + * @param string $matches + * @return string + */ + protected function _hashHTMLBlocks_callback($matches) { + $text = $matches[1]; + $key = $this->hashBlock($text); + return "\n\n$key\n\n"; + } + + /** + * Called whenever a tag must be hashed when a function insert an atomic + * element in the text stream. Passing $text to through this function gives + * a unique text-token which will be reverted back when calling unhash. + * + * The $boundary argument specify what character should be used to surround + * the token. By convension, "B" is used for block elements that needs not + * to be wrapped into paragraph tags at the end, ":" is used for elements + * that are word separators and "X" is used in the general case. + * + * @param string $text + * @param string $boundary + * @return string + */ + protected function hashPart($text, $boundary = 'X') { + // Swap back any tag hash found in $text so we do not have to `unhash` + // multiple times at the end. + $text = $this->unhash($text); + + // Then hash the block. + static $i = 0; + $key = "$boundary\x1A" . ++$i . $boundary; + $this->html_hashes[$key] = $text; + return $key; // String that will replace the tag. + } + + /** + * Shortcut function for hashPart with block-level boundaries. + * @param string $text + * @return string + */ + protected function hashBlock($text) { + return $this->hashPart($text, 'B'); + } + + /** + * Define the block gamut - these are all the transformations that form + * block-level tags like paragraphs, headers, and list items. + */ + protected $block_gamut = array( + "doHeaders" => 10, + "doHorizontalRules" => 20, + "doLists" => 40, + "doCodeBlocks" => 50, + "doBlockQuotes" => 60, + ); + + /** + * Run block gamut tranformations. + * + * We need to escape raw HTML in Markdown source before doing anything + * else. This need to be done for each block, and not only at the + * begining in the Markdown function since hashed blocks can be part of + * list items and could have been indented. Indented blocks would have + * been seen as a code block in a previous pass of hashHTMLBlocks. + * + * @param string $text + * @return string + */ + protected function runBlockGamut($text) { + $text = $this->hashHTMLBlocks($text); + return $this->runBasicBlockGamut($text); + } + + /** + * Run block gamut tranformations, without hashing HTML blocks. This is + * useful when HTML blocks are known to be already hashed, like in the first + * whole-document pass. + * + * @param string $text + * @return string + */ + protected function runBasicBlockGamut($text) { + + foreach ($this->block_gamut as $method => $priority) { + $text = $this->$method($text); + } + + // Finally form paragraph and restore hashed blocks. + $text = $this->formParagraphs($text); + + return $text; + } + + /** + * Convert horizontal rules + * @param string $text + * @return string + */ + protected function doHorizontalRules($text) { + return preg_replace( + '{ + ^[ ]{0,3} # Leading space + ([-*_]) # $1: First marker + (?> # Repeated marker group + [ ]{0,2} # Zero, one, or two spaces. + \1 # Marker character + ){2,} # Group repeated at least twice + [ ]* # Tailing spaces + $ # End of line. + }mx', + "\n".$this->hashBlock("empty_element_suffix")."\n", + $text + ); + } + + /** + * These are all the transformations that occur *within* block-level + * tags like paragraphs, headers, and list items. + */ + protected $span_gamut = array( + // Process character escapes, code spans, and inline HTML + // in one shot. + "parseSpan" => -30, + // Process anchor and image tags. Images must come first, + // because ![foo][f] looks like an anchor. + "doImages" => 10, + "doAnchors" => 20, + // Make links out of things like `` + // Must come after doAnchors, because you can use < and > + // delimiters in inline links like [this](). + "doAutoLinks" => 30, + "encodeAmpsAndAngles" => 40, + "doItalicsAndBold" => 50, + "doHardBreaks" => 60, + ); + + /** + * Run span gamut transformations + * @param string $text + * @return string + */ + protected function runSpanGamut($text) { + foreach ($this->span_gamut as $method => $priority) { + $text = $this->$method($text); + } + + return $text; + } + + /** + * Do hard breaks + * @param string $text + * @return string + */ + protected function doHardBreaks($text) { + if ($this->hard_wrap) { + return preg_replace_callback('/ *\n/', + array($this, '_doHardBreaks_callback'), $text); + } else { + return preg_replace_callback('/ {2,}\n/', + array($this, '_doHardBreaks_callback'), $text); + } + } + + /** + * Trigger part hashing for the hard break (callback method) + * @param array $matches + * @return string + */ + protected function _doHardBreaks_callback($matches) { + return $this->hashPart("empty_element_suffix\n"); + } + + /** + * Turn Markdown link shortcuts into XHTML tags. + * @param string $text + * @return string + */ + protected function doAnchors($text) { + if ($this->in_anchor) { + return $text; + } + $this->in_anchor = true; + + // First, handle reference-style links: [link text] [id] + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + \[ + ('.$this->nested_brackets_re.') # link text = $2 + \] + + [ ]? # one optional space + (?:\n[ ]*)? # one optional newline followed by spaces + + \[ + (.*?) # id = $3 + \] + ) + }xs', + array($this, '_doAnchors_reference_callback'), $text); + + // Next, inline-style links: [link text](url "optional title") + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + \[ + ('.$this->nested_brackets_re.') # link text = $2 + \] + \( # literal paren + [ \n]* + (?: + <(.+?)> # href = $3 + | + ('.$this->nested_url_parenthesis_re.') # href = $4 + ) + [ \n]* + ( # $5 + ([\'"]) # quote char = $6 + (.*?) # Title = $7 + \6 # matching quote + [ \n]* # ignore any spaces/tabs between closing quote and ) + )? # title is optional + \) + ) + }xs', + array($this, '_doAnchors_inline_callback'), $text); + + // Last, handle reference-style shortcuts: [link text] + // These must come last in case you've also got [link text][1] + // or [link text](/foo) + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + \[ + ([^\[\]]+) # link text = $2; can\'t contain [ or ] + \] + ) + }xs', + array($this, '_doAnchors_reference_callback'), $text); + + $this->in_anchor = false; + return $text; + } + + /** + * Callback method to parse referenced anchors + * @param array $matches + * @return string + */ + protected function _doAnchors_reference_callback($matches) { + $whole_match = $matches[1]; + $link_text = $matches[2]; + $link_id =& $matches[3]; + + if ($link_id == "") { + // for shortcut links like [this][] or [this]. + $link_id = $link_text; + } + + // lower-case and turn embedded newlines into spaces + $link_id = strtolower($link_id); + $link_id = preg_replace('{[ ]?\n}', ' ', $link_id); + + if (isset($this->urls[$link_id])) { + $url = $this->urls[$link_id]; + $url = $this->encodeURLAttribute($url); + + $result = "titles[$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; + } + + /** + * Callback method to parse inline anchors + * @param array $matches + * @return string + */ + protected function _doAnchors_inline_callback($matches) { + $link_text = $this->runSpanGamut($matches[2]); + $url = $matches[3] === '' ? $matches[4] : $matches[3]; + $title =& $matches[7]; + + // If the URL was of the form it got caught by the HTML + // tag parser and hashed. Need to reverse the process before using + // the URL. + $unhashed = $this->unhash($url); + if ($unhashed !== $url) + $url = preg_replace('/^<(.*)>$/', '\1', $unhashed); + + $url = $this->encodeURLAttribute($url); + + $result = "encodeAttribute($title); + $result .= " title=\"$title\""; + } + + $link_text = $this->runSpanGamut($link_text); + $result .= ">$link_text"; + + return $this->hashPart($result); + } + + /** + * Turn Markdown image shortcuts into tags. + * @param string $text + * @return string + */ + protected function doImages($text) { + // First, handle reference-style labeled images: ![alt text][id] + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + !\[ + ('.$this->nested_brackets_re.') # alt text = $2 + \] + + [ ]? # one optional space + (?:\n[ ]*)? # one optional newline followed by spaces + + \[ + (.*?) # id = $3 + \] + + ) + }xs', + array($this, '_doImages_reference_callback'), $text); + + // Next, handle inline images: ![alt text](url "optional title") + // Don't forget: encode * and _ + $text = preg_replace_callback('{ + ( # wrap whole match in $1 + !\[ + ('.$this->nested_brackets_re.') # alt text = $2 + \] + \s? # One optional whitespace character + \( # literal paren + [ \n]* + (?: + <(\S*)> # src url = $3 + | + ('.$this->nested_url_parenthesis_re.') # src url = $4 + ) + [ \n]* + ( # $5 + ([\'"]) # quote char = $6 + (.*?) # title = $7 + \6 # matching quote + [ \n]* + )? # title is optional + \) + ) + }xs', + array($this, '_doImages_inline_callback'), $text); + + return $text; + } + + /** + * Callback to parse references image tags + * @param array $matches + * @return string + */ + protected function _doImages_reference_callback($matches) { + $whole_match = $matches[1]; + $alt_text = $matches[2]; + $link_id = strtolower($matches[3]); + + if ($link_id == "") { + $link_id = strtolower($alt_text); // for shortcut links like ![this][]. + } + + $alt_text = $this->encodeAttribute($alt_text); + if (isset($this->urls[$link_id])) { + $url = $this->encodeURLAttribute($this->urls[$link_id]); + $result = "\"$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; + } + + /** + * Callback to parse inline image tags + * @param array $matches + * @return string + */ + protected function _doImages_inline_callback($matches) { + $whole_match = $matches[1]; + $alt_text = $matches[2]; + $url = $matches[3] == '' ? $matches[4] : $matches[3]; + $title =& $matches[7]; + + $alt_text = $this->encodeAttribute($alt_text); + $url = $this->encodeURLAttribute($url); + $result = "\"$alt_text\"";encodeAttribute($title); + $result .= " title=\"$title\""; // $title already quoted + } + $result .= $this->empty_element_suffix; + + return $this->hashPart($result); + } + + /** + * Parse Markdown heading elements to HTML + * @param string $text + * @return string + */ + protected function doHeaders($text) { + /** + * Setext-style headers: + * Header 1 + * ======== + * + * Header 2 + * -------- + */ + $text = preg_replace_callback('{ ^(.+?)[ ]*\n(=+|-+)[ ]*\n+ }mx', + array($this, '_doHeaders_callback_setext'), $text); + + /** + * atx-style headers: + * # Header 1 + * ## Header 2 + * ## Header 2 with closing hashes ## + * ... + * ###### Header 6 + */ + $text = preg_replace_callback('{ + ^(\#{1,6}) # $1 = string of #\'s + [ ]* + (.+?) # $2 = Header text + [ ]* + \#* # optional closing #\'s (not counted) + \n+ + }xm', + array($this, '_doHeaders_callback_atx'), $text); + + return $text; + } + + /** + * Setext header parsing callback + * @param array $matches + * @return string + */ + protected function _doHeaders_callback_setext($matches) { + // Terrible hack to check we haven't found an empty list item. + if ($matches[2] == '-' && preg_match('{^-(?: |$)}', $matches[1])) { + return $matches[0]; + } + + $level = $matches[2][0] == '=' ? 1 : 2; + + // ID attribute generation + $idAtt = $this->_generateIdFromHeaderValue($matches[1]); + + $block = "".$this->runSpanGamut($matches[1]).""; + return "\n" . $this->hashBlock($block) . "\n\n"; + } + + /** + * ATX header parsing callback + * @param array $matches + * @return string + */ + protected function _doHeaders_callback_atx($matches) { + // ID attribute generation + $idAtt = $this->_generateIdFromHeaderValue($matches[2]); + + $level = strlen($matches[1]); + $block = "".$this->runSpanGamut($matches[2]).""; + return "\n" . $this->hashBlock($block) . "\n\n"; + } + + /** + * If a header_id_func property is set, we can use it to automatically + * generate an id attribute. + * + * This method returns a string in the form id="foo", or an empty string + * otherwise. + * @param string $headerValue + * @return string + */ + protected function _generateIdFromHeaderValue($headerValue) { + if (!is_callable($this->header_id_func)) { + return ""; + } + + $idValue = call_user_func($this->header_id_func, $headerValue); + if (!$idValue) { + return ""; + } + + return ' id="' . $this->encodeAttribute($idValue) . '"'; + } + + /** + * Form HTML ordered (numbered) and unordered (bulleted) lists. + * @param string $text + * @return string + */ + protected function doLists($text) { + $less_than_tab = $this->tab_width - 1; + + // Re-usable patterns to match list item bullets and number markers: + $marker_ul_re = '[*+-]'; + $marker_ol_re = '\d+[\.]'; + + $markers_relist = array( + $marker_ul_re => $marker_ol_re, + $marker_ol_re => $marker_ul_re, + ); + + foreach ($markers_relist as $marker_re => $other_marker_re) { + // Re-usable pattern to match any entirel ul or ol list: + $whole_list_re = ' + ( # $1 = whole list + ( # $2 + ([ ]{0,'.$less_than_tab.'}) # $3 = number of spaces + ('.$marker_re.') # $4 = first list item marker + [ ]+ + ) + (?s:.+?) + ( # $5 + \z + | + \n{2,} + (?=\S) + (?! # Negative lookahead for another list item marker + [ ]* + '.$marker_re.'[ ]+ + ) + | + (?= # Lookahead for another kind of list + \n + \3 # Must have the same indentation + '.$other_marker_re.'[ ]+ + ) + ) + ) + '; // mx + + // We use a different prefix before nested lists than top-level lists. + //See extended comment in _ProcessListItems(). + + if ($this->list_level) { + $text = preg_replace_callback('{ + ^ + '.$whole_list_re.' + }mx', + array($this, '_doLists_callback'), $text); + } else { + $text = preg_replace_callback('{ + (?:(?<=\n)\n|\A\n?) # Must eat the newline + '.$whole_list_re.' + }mx', + array($this, '_doLists_callback'), $text); + } + } + + return $text; + } + + /** + * List parsing callback + * @param array $matches + * @return string + */ + protected function _doLists_callback($matches) { + // Re-usable patterns to match list item bullets and number markers: + $marker_ul_re = '[*+-]'; + $marker_ol_re = '\d+[\.]'; + $marker_any_re = "(?:$marker_ul_re|$marker_ol_re)"; + $marker_ol_start_re = '[0-9]+'; + + $list = $matches[1]; + $list_type = preg_match("/$marker_ul_re/", $matches[4]) ? "ul" : "ol"; + + $marker_any_re = ( $list_type == "ul" ? $marker_ul_re : $marker_ol_re ); + + $list .= "\n"; + $result = $this->processListItems($list, $marker_any_re); + + $ol_start = 1; + if ($this->enhanced_ordered_list) { + // Get the start number for ordered list. + if ($list_type == 'ol') { + $ol_start_array = array(); + $ol_start_check = preg_match("/$marker_ol_start_re/", $matches[4], $ol_start_array); + if ($ol_start_check){ + $ol_start = $ol_start_array[0]; + } + } + } + + if ($ol_start > 1 && $list_type == 'ol'){ + $result = $this->hashBlock("<$list_type start=\"$ol_start\">\n" . $result . ""); + } else { + $result = $this->hashBlock("<$list_type>\n" . $result . ""); + } + return "\n". $result ."\n\n"; + } + + /** + * Nesting tracker for list levels + */ + protected $list_level = 0; + + /** + * Process the contents of a single ordered or unordered list, splitting it + * into individual list items. + * @param string $list_str + * @param string $marker_any_re + * @return string + */ + protected function processListItems($list_str, $marker_any_re) { + /** + * The $this->list_level global keeps track of when we're inside a list. + * Each time we enter a list, we increment it; when we leave a list, + * we decrement. If it's zero, we're not in a list anymore. + * + * We do this because when we're not inside a list, we want to treat + * something like this: + * + * I recommend upgrading to version + * 8. Oops, now this line is treated + * as a sub-list. + * + * As a single paragraph, despite the fact that the second line starts + * with a digit-period-space sequence. + * + * Whereas when we're inside a list (or sub-list), that line will be + * treated as the start of a sub-list. What a kludge, huh? This is + * an aspect of Markdown's syntax that's hard to parse perfectly + * without resorting to mind-reading. Perhaps the solution is to + * change the syntax rules such that sub-lists must start with a + * starting cardinal number; e.g. "1." or "a.". + */ + $this->list_level++; + + // Trim trailing blank lines: + $list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str); + + $list_str = preg_replace_callback('{ + (\n)? # leading line = $1 + (^[ ]*) # leading whitespace = $2 + ('.$marker_any_re.' # list marker and space = $3 + (?:[ ]+|(?=\n)) # space only required if item is not empty + ) + ((?s:.*?)) # list item text = $4 + (?:(\n+(?=\n))|\n) # tailing blank line = $5 + (?= \n* (\z | \2 ('.$marker_any_re.') (?:[ ]+|(?=\n)))) + }xm', + array($this, '_processListItems_callback'), $list_str); + + $this->list_level--; + return $list_str; + } + + /** + * List item parsing callback + * @param array $matches + * @return string + */ + protected function _processListItems_callback($matches) { + $item = $matches[4]; + $leading_line =& $matches[1]; + $leading_space =& $matches[2]; + $marker_space = $matches[3]; + $tailing_blank_line =& $matches[5]; + + if ($leading_line || $tailing_blank_line || + preg_match('/\n{2,}/', $item)) + { + // Replace marker with the appropriate whitespace indentation + $item = $leading_space . str_repeat(' ', strlen($marker_space)) . $item; + $item = $this->runBlockGamut($this->outdent($item)."\n"); + } else { + // Recursion for sub-lists: + $item = $this->doLists($this->outdent($item)); + $item = $this->formParagraphs($item, false); + } + + return "
  • " . $item . "
    • \n"; + } + + /** + * Process Markdown `
    ` blocks.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doCodeBlocks($text) {
+		$text = preg_replace_callback('{
+				(?:\n\n|\A\n?)
+				(	            # $1 = the code block -- one or more lines, starting with a space/tab
+				  (?>
+					[ ]{'.$this->tab_width.'}  # Lines must start with a tab or a tab-width of spaces
+					.*\n+
+				  )+
+				)
+				((?=^[ ]{0,'.$this->tab_width.'}\S)|\Z)	# Lookahead for non-space at line-start, or end of doc
+			}xm',
+			array($this, '_doCodeBlocks_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Code block parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doCodeBlocks_callback($matches) {
+		$codeblock = $matches[1];
+
+		$codeblock = $this->outdent($codeblock);
+		if (is_callable($this->code_block_content_func)) {
+			$codeblock = call_user_func($this->code_block_content_func, $codeblock, "");
+		} else {
+			$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+		}
+
+		# trim leading newlines and trailing newlines
+		$codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
+
+		$codeblock = "
    $codeblock\n
    ";
+		return "\n\n" . $this->hashBlock($codeblock) . "\n\n";
+	}
+
+	/**
+	 * Create a code span markup for $code. Called from handleSpanToken.
+	 * @param  string $code
+	 * @return string
+	 */
+	protected function makeCodeSpan($code) {
+		if (is_callable($this->code_span_content_func)) {
+			$code = call_user_func($this->code_span_content_func, $code);
+		} else {
+			$code = htmlspecialchars(trim($code), ENT_NOQUOTES);
+		}
+		return $this->hashPart("$code");
+	}
+
+	/**
+	 * Define the emphasis operators with their regex matches
+	 * @var array
+	 */
+	protected $em_relist = array(
+		''  => '(?:(? '(? '(? '(?:(? '(? '(? '(?:(? '(? '(?em_relist as $em => $em_re) {
+			foreach ($this->strong_relist as $strong => $strong_re) {
+				// Construct list of allowed token expressions.
+				$token_relist = array();
+				if (isset($this->em_strong_relist["$em$strong"])) {
+					$token_relist[] = $this->em_strong_relist["$em$strong"];
+				}
+				$token_relist[] = $em_re;
+				$token_relist[] = $strong_re;
+
+				// Construct master expression from list.
+				$token_re = '{(' . implode('|', $token_relist) . ')}';
+				$this->em_strong_prepared_relist["$em$strong"] = $token_re;
+			}
+		}
+	}
+
+	/**
+	 * Convert Markdown italics (emphasis) and bold (strong) to HTML
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doItalicsAndBold($text) {
+		if ($this->in_emphasis_processing) {
+			return $text; // avoid reentrency
+		}
+		$this->in_emphasis_processing = true;
+
+		$token_stack = array('');
+		$text_stack = array('');
+		$em = '';
+		$strong = '';
+		$tree_char_em = false;
+
+		while (1) {
+			// Get prepared regular expression for seraching emphasis tokens
+			// in current context.
+			$token_re = $this->em_strong_prepared_relist["$em$strong"];
+
+			// Each loop iteration search for the next emphasis token.
+			// Each token is then passed to handleSpanToken.
+			$parts = preg_split($token_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
+			$text_stack[0] .= $parts[0];
+			$token =& $parts[1];
+			$text =& $parts[2];
+
+			if (empty($token)) {
+				// Reached end of text span: empty stack without emitting.
+				// any more emphasis.
+				while ($token_stack[0]) {
+					$text_stack[1] .= array_shift($token_stack);
+					$text_stack[0] .= array_shift($text_stack);
+				}
+				break;
+			}
+
+			$token_len = strlen($token);
+			if ($tree_char_em) {
+				// Reached closing marker while inside a three-char emphasis.
+				if ($token_len == 3) {
+					// Three-char closing marker, close em and strong.
+					array_shift($token_stack);
+					$span = array_shift($text_stack);
+					$span = $this->runSpanGamut($span);
+					$span = "$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);
+						$em = '';
+					}
+					// Closing strong marker:
+					array_shift($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;
+				}
+			}
+		}
+		$this->in_emphasis_processing = false;
+		return $text_stack[0];
+	}
+
+	/**
+	 * Parse Markdown blockquotes to HTML
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doBlockQuotes($text) {
+		$text = preg_replace_callback('/
+			  (								# Wrap whole match in $1
+				(?>
+				  ^[ ]*>[ ]?			# ">" at the start of a line
+					.+\n					# rest of the first line
+				  (.+\n)*					# subsequent consecutive lines
+				  \n*						# blanks
+				)+
+			  )
+			/xm',
+			array($this, '_doBlockQuotes_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Blockquote parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doBlockQuotes_callback($matches) {
+		$bq = $matches[1];
+		// trim one level of quoting - trim whitespace-only lines
+		$bq = preg_replace('/^[ ]*>[ ]?|^[ ]+$/m', '', $bq);
+		$bq = $this->runBlockGamut($bq); // recurse
+
+		$bq = preg_replace('/^/m', "  ", $bq);
+		// These leading spaces cause problem with 
     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";
+	}
+
+	/**
+	 * Blockquote parsing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doBlockQuotes_callback2($matches) {
+		$pre = $matches[1];
+		$pre = preg_replace('/^  /m', '', $pre);
+		return $pre;
+	}
+
+	/**
+	 * Parse paragraphs
+	 *
+	 * @param  string $text String to process in paragraphs
+	 * @param  boolean $wrap_in_p Whether paragraphs should be wrapped in 
     tags
+	 * @return string
+	 */
+	protected function formParagraphs($text, $wrap_in_p = true) {
+		// Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		// Wrap 
     tags and unhashify HTML blocks
+		foreach ($grafs as $key => $value) {
+			if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
+				// Is a paragraph.
+				$value = $this->runSpanGamut($value);
+				if ($wrap_in_p) {
+					$value = preg_replace('/^([ ]*)/', "
    ", $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);
+	}
+
+	/**
+	 * Encode text for a double-quoted HTML attribute. This function
+	 * is *not* suitable for attributes enclosed in single quotes.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function encodeAttribute($text) {
+		$text = $this->encodeAmpsAndAngles($text);
+		$text = str_replace('"', '"', $text);
+		return $text;
+	}
+
+	/**
+	 * Encode text for a double-quoted HTML attribute containing a URL,
+	 * applying the URL filter if set. Also generates the textual
+	 * representation for the URL (removing mailto: or tel:) storing it in $text.
+	 * This function is *not* suitable for attributes enclosed in single quotes.
+	 *
+	 * @param  string $url
+	 * @param  string $text Passed by reference
+	 * @return string        URL
+	 */
+	protected function encodeURLAttribute($url, &$text = null) {
+		if (is_callable($this->url_filter_func)) {
+			$url = call_user_func($this->url_filter_func, $url);
+		}
+
+		if (preg_match('{^mailto:}i', $url)) {
+			$url = $this->encodeEntityObfuscatedAttribute($url, $text, 7);
+		} else if (preg_match('{^tel:}i', $url)) {
+			$url = $this->encodeAttribute($url);
+			$text = substr($url, 4);
+		} else {
+			$url = $this->encodeAttribute($url);
+			$text = $url;
+		}
+
+		return $url;
+	}
+
+	/**
+	 * Smart processing for ampersands and angle brackets that need to
+	 * be encoded. Valid character entities are left alone unless the
+	 * no-entities mode is set.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function encodeAmpsAndAngles($text) {
+		if ($this->no_entities) {
+			$text = str_replace('&', '&', $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;
+	}
+
+	/**
+	 * Parse Markdown automatic links to anchor HTML tags
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAutoLinks($text) {
+		$text = preg_replace_callback('{<((https?|ftp|dict|tel):[^\'">\s]+)>}i',
+			array($this, '_doAutoLinks_url_callback'), $text);
+
+		// Email addresses: 
+		$text = preg_replace_callback('{
+			<
+			(?:mailto:)?
+			(
+				(?:
+					[-!#$%&\'*+/=?^_`.{|}~\w\x80-\xFF]+
+				|
+					".*?"
+				)
+				\@
+				(?:
+					[-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
+				|
+					\[[\d.a-fA-F:]+\]	# IPv4 & IPv6
+				)
+			)
+			>
+			}xi',
+			array($this, '_doAutoLinks_email_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Parse URL callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAutoLinks_url_callback($matches) {
+		$url = $this->encodeURLAttribute($matches[1], $text);
+		$link = "$text";
+		return $this->hashPart($link);
+	}
+
+	/**
+	 * Parse email address callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAutoLinks_email_callback($matches) {
+		$addr = $matches[1];
+		$url = $this->encodeURLAttribute("mailto:$addr", $text);
+		$link = "$text";
+		return $this->hashPart($link);
+	}
+
+	/**
+	 * Input: some text to obfuscate, e.g. "mailto:foo@example.com"
+	 *
+	 * Output: the same text but with most characters encoded as either a
+	 *         decimal or hex entity, in the hopes of foiling most address
+	 *         harvesting spam bots. E.g.:
+	 *
+	 *        mailto:foo
+	 *        @example.co
+	 *        m
+	 *
+	 * Note: the additional output $tail is assigned the same value as the
+	 * ouput, minus the number of characters specified by $head_length.
+	 *
+	 * Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
+	 * With some optimizations by Milian Wolff. Forced encoding of HTML
+	 * attribute special characters by Allan Odgaard.
+	 *
+	 * @param  string  $text
+	 * @param  string  $tail Passed by reference
+	 * @param  integer $head_length
+	 * @return string
+	 */
+	protected function encodeEntityObfuscatedAttribute($text, &$tail = null, $head_length = 0) {
+		if ($text == "") {
+			return $tail = "";
+		}
+
+		$chars = preg_split('/(? $char) {
+			$ord = ord($char);
+			// Ignore non-ascii chars.
+			if ($ord < 128) {
+				$r = ($seed * (1 + $key)) % 100; // Pseudo-random function.
+				// roughly 10% raw, 45% hex, 45% dec
+				// '@' *must* be encoded. I insist.
+				// '"' and '>' have to be encoded inside the attribute
+				if ($r > 90 && strpos('@"&>', $char) === false) {
+					/* do nothing */
+				} else if ($r < 45) {
+					$chars[$key] = '&#x'.dechex($ord).';';
+				} else {
+					$chars[$key] = '&#'.$ord.';';
+				}
+			}
+		}
+
+		$text = implode('', $chars);
+		$tail = $head_length ? implode('', array_slice($chars, $head_length)) : $text;
+
+		return $text;
+	}
+
+	/**
+	 * Take the string $str and parse it into tokens, hashing embeded HTML,
+	 * escaped characters and handling code spans.
+	 * @param  string $str
+	 * @return string
+	 */
+	protected function parseSpan($str) {
+		$output = '';
+
+		$span_re = '{
+				(
+					\\\\'.$this->escape_chars_re.'
+				|
+					(?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;
+	}
+
+	/**
+	 * Handle $token provided by parseSpan by determining its nature and
+	 * returning the corresponding value that should replace it.
+	 * @param  string $token
+	 * @param  string $str Passed by reference
+	 * @return string
+	 */
+	protected function handleSpanToken($token, &$str) {
+		switch ($token[0]) {
+			case "\\":
+				return $this->hashPart("&#". ord($token[1]). ";");
+			case "`":
+				// Search for end marker in remaining text.
+				if (preg_match('/^(.*?[^`])'.preg_quote($token).'(?!`)(.*)$/sm',
+					$str, $matches))
+				{
+					$str = $matches[2];
+					$codespan = $this->makeCodeSpan($matches[1]);
+					return $this->hashPart($codespan);
+				}
+				return $token; // Return as text since no ending marker found.
+			default:
+				return $this->hashPart($token);
+		}
+	}
+
+	/**
+	 * Remove one level of line-leading tabs or spaces
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function outdent($text) {
+		return preg_replace('/^(\t|[ ]{1,' . $this->tab_width . '})/m', '', $text);
+	}
+
+
+	/**
+	 * String length function for detab. `_initDetab` will create a function to
+	 * handle UTF-8 if the default function does not exist.
+	 * can be a string or function
+	 */
+	protected $utf8_strlen = 'mb_strlen';
+
+	/**
+	 * Replace tabs with the appropriate amount of spaces.
+	 *
+	 * For each line we separate the line in blocks delemited by tab characters.
+	 * Then we reconstruct every line by adding the  appropriate number of space
+	 * between each blocks.
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function detab($text) {
+		$text = preg_replace_callback('/^.*\t.*$/m',
+			array($this, '_detab_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Replace tabs callback
+	 * @param  string $matches
+	 * @return string
+	 */
+	protected function _detab_callback($matches) {
+		$line = $matches[0];
+		$strlen = $this->utf8_strlen; // strlen function for UTF-8.
+
+		// Split in blocks.
+		$blocks = explode("\t", $line);
+		// Add each blocks to the line.
+		$line = $blocks[0];
+		unset($blocks[0]); // Do not add first block twice.
+		foreach ($blocks as $block) {
+			// Calculate amount of space, insert spaces, insert block.
+			$amount = $this->tab_width -
+				$strlen($line, 'UTF-8') % $this->tab_width;
+			$line .= str_repeat(" ", $amount) . $block;
+		}
+		return $line;
+	}
+
+	/**
+	 * Check for the availability of the function in the `utf8_strlen` property
+	 * (initially `mb_strlen`). If the function is not available, create a
+	 * function that will loosely count the number of UTF-8 characters with a
+	 * regular expression.
+	 * @return void
+	 */
+	protected function _initDetab() {
+
+		if (function_exists($this->utf8_strlen)) {
+			return;
+		}
+
+		$this->utf8_strlen = function ($text) { return preg_match_all('/[\x00-\xBF]|[\xC0-\xFF][\x80-\xBF]*/', $text, $m); };
+	}
+
+	/**
+	 * Swap back in all the tags hashed by _HashHTMLBlocks.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function unhash($text) {
+		return preg_replace_callback('/(.)\x1A[0-9]+\1/',
+			array($this, '_unhash_callback'), $text);
+	}
+
+	/**
+	 * Unhashing callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _unhash_callback($matches) {
+		return $this->html_hashes[$matches[0]];
+	}
+}
diff --git a/mdlibs/MarkdownExtra.inc.php b/mdlibs/MarkdownExtra.inc.php
new file mode 100644
index 0000000..d09bd7a
--- /dev/null
+++ b/mdlibs/MarkdownExtra.inc.php
@@ -0,0 +1,11 @@
+
+ * @copyright 2004-2019 Michel Fortin 
+ * @copyright (Original Markdown) 2004-2006 John Gruber 
+ */
+
+namespace mdlibs;
+
+/**
+ * Markdown Extra Parser Class
+ */
+class MarkdownExtra extends \mdlibs\Markdown {
+	/**
+	 * Configuration variables
+	 */
+	/**
+	 * Prefix for footnote ids.
+	 */
+	public $fn_id_prefix = "";
+
+	/**
+	 * Optional title attribute for footnote links.
+	 */
+	public $fn_link_title = "";
+
+	/**
+	 * Optional class attribute for footnote links and backlinks.
+	 */
+	public $fn_link_class     = "footnote-ref";
+	public $fn_backlink_class = "footnote-backref";
+
+	/**
+	 * Content to be displayed within footnote backlinks. The default is '↩';
+	 * the U+FE0E on the end is a Unicode variant selector used to prevent iOS
+	 * from displaying the arrow character as an emoji.
+	 * Optionally use '^^' and '%%' to refer to the footnote number and
+	 * reference number respectively. {@see parseFootnotePlaceholders()}
+	 */
+	public $fn_backlink_html = '↩︎';
+
+	/**
+	 * Optional title and aria-label attributes for footnote backlinks for
+	 * added accessibility (to ensure backlink uniqueness).
+	 * Use '^^' and '%%' to refer to the footnote number and reference number
+	 * respectively. {@see parseFootnotePlaceholders()}
+	 */
+	public $fn_backlink_title = "";
+	public $fn_backlink_label = "";
+
+	/**
+	 * Class name for table cell alignment (%% replaced left/center/right)
+	 * For instance: 'go-%%' becomes 'go-left' or 'go-right' or 'go-center'
+	 * If empty, the align attribute is used instead of a class name.
+	 */
+	public $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();
+
+	/**
+	 * Only convert atx-style headers if there's a space between the header and #
+	 */
+	public $hashtag_protection = false;
+
+	/**
+	 * Determines whether footnotes should be appended to the end of the document.
+	 * If true, footnote html can be retrieved from $this->footnotes_assembled.
+	 */
+	public $omit_footnotes = false;
+
+
+	/**
+	 * After parsing, the HTML for the list of footnotes appears here.
+	 * This is available only if $omit_footnotes == true.
+	 *
+	 * Note: when placing the content of `footnotes_assembled` on the page,
+	 * consider adding the attribute `role="doc-endnotes"` to the `div` or
+	 * `section` that will enclose the list of footnotes so they are
+	 * reachable to accessibility tools the same way they would be with the
+	 * default HTML output.
+	 */
+	public $footnotes_assembled = null;
+
+	/**
+	 * Parser implementation
+	 */
+
+	/**
+	 * Constructor function. Initialize the parser object.
+	 * @return void
+	 */
+	public function __construct() {
+		// Add extra escapable characters before parent constructor
+		// initialize the table.
+		$this->escape_chars .= ':|';
+
+		// Insert extra document, block, and span transformations.
+		// Parent constructor will do the sorting.
+		$this->document_gamut += array(
+			"doFencedCodeBlocks" => 5,
+			"stripFootnotes"     => 15,
+			"stripAbbreviations" => 25,
+			"appendFootnotes"    => 50,
+		);
+		$this->block_gamut += array(
+			"doFencedCodeBlocks" => 5,
+			"doTables"           => 15,
+			"doDefLists"         => 45,
+		);
+		$this->span_gamut += array(
+			"doFootnotes"        => 5,
+			"doAbbreviations"    => 70,
+		);
+
+		$this->enhanced_ordered_list = true;
+		parent::__construct();
+	}
+
+
+	/**
+	 * Extra variables used during extra transformations.
+	 */
+	protected $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;
+
+    /**
+	 * Ref attribute for links
+	 */
+	protected $ref_attr = array();
+
+	/**
+	 * Setting up Extra-specific variables.
+	 */
+	protected function setup() {
+		parent::setup();
+
+		$this->footnotes = array();
+		$this->footnotes_ordered = array();
+		$this->footnotes_ref_count = array();
+		$this->footnotes_numbers = array();
+		$this->abbr_desciptions = array();
+		$this->abbr_word_re = '';
+		$this->footnote_counter = 1;
+		$this->footnotes_assembled = null;
+
+		foreach ($this->predef_abbr as $abbr_word => $abbr_desc) {
+			if ($this->abbr_word_re)
+				$this->abbr_word_re .= '|';
+			$this->abbr_word_re .= preg_quote($abbr_word);
+			$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
+		}
+	}
+
+	/**
+	 * Clearing Extra-specific variables.
+	 */
+	protected function teardown() {
+		$this->footnotes = array();
+		$this->footnotes_ordered = array();
+		$this->footnotes_ref_count = array();
+		$this->footnotes_numbers = array();
+		$this->abbr_desciptions = array();
+		$this->abbr_word_re = '';
+
+		if ( ! $this->omit_footnotes )
+			$this->footnotes_assembled = null;
+
+		parent::teardown();
+	}
+
+
+	/**
+	 * Extra attribute parser
+	 */
+	/**
+	 * Expression to use to catch attributes (includes the braces)
+	 */
+	protected $id_class_attr_catch_re = '\{((?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,})[ ]*\}';
+
+	/**
+	 * Expression to use when parsing in a context when no capture is desired
+	 */
+	protected $id_class_attr_nocatch_re = '\{(?>[ ]*[#.a-z][-_:a-zA-Z0-9=]+){1,}[ ]*\}';
+
+	/**
+	 * Parse attributes caught by the $this->id_class_attr_catch_re expression
+	 * and return the HTML-formatted list of attributes.
+	 *
+	 * Currently supported attributes are .class and #id.
+	 *
+	 * In addition, this method also supports supplying a default Id value,
+	 * which will be used to populate the id attribute in case it was not
+	 * overridden.
+	 * @param  string $tag_name
+	 * @param  string $attr
+	 * @param  mixed  $defaultIdValue
+	 * @param  array  $classes
+	 * @return string
+	 */
+	protected function doExtraAttributes($tag_name, $attr, $defaultIdValue = null, $classes = array()) {
+		if (empty($attr) && !$defaultIdValue && empty($classes)) {
+			return "";
+		}
+
+		// Split on components
+		preg_match_all('/[#.a-z][-_:a-zA-Z0-9=]+/', $attr, $matches);
+		$elements = $matches[0];
+
+		// Handle classes and IDs (only first ID taken into account)
+		$attributes = array();
+		$id = false;
+		foreach ($elements as $element) {
+			if ($element[0] === '.') {
+				$classes[] = substr($element, 1);
+			} else if ($element[0] === '#') {
+				if ($id === false) $id = substr($element, 1);
+			} else if (strpos($element, '=') > 0) {
+				$parts = explode('=', $element, 2);
+				$attributes[] = $parts[0] . '="' . $parts[1] . '"';
+			}
+		}
+
+		if ($id === false || $id === '') {
+			$id = $defaultIdValue;
+		}
+
+		// Compose attributes as string
+		$attr_str = "";
+		if (!empty($id)) {
+			$attr_str .= ' id="'.$this->encodeAttribute($id) .'"';
+		}
+		if (!empty($classes)) {
+			$attr_str .= ' class="'. implode(" ", $classes) . '"';
+		}
+		if (!$this->no_markup && !empty($attributes)) {
+			$attr_str .= ' '.implode(" ", $attributes);
+		}
+		return $attr_str;
+	}
+
+	/**
+	 * Strips link definitions from text, stores the URLs and titles in
+	 * hash references.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripLinkDefinitions($text) {
+		$less_than_tab = $this->tab_width - 1;
+
+		// Link defs are in the form: ^[id]: url "optional title"
+		$text = preg_replace_callback('{
+							^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?:	# id = $1
+							  [ ]*
+							  \n?				# maybe *one* newline
+							  [ ]*
+							(?:
+							  <(.+?)>			# url = $2
+							|
+							  (\S+?)			# url = $3
+							)
+							  [ ]*
+							  \n?				# maybe one newline
+							  [ ]*
+							(?:
+								(?<=\s)			# lookbehind for whitespace
+								["(]
+								(.*?)			# title = $4
+								[")]
+								[ ]*
+							)?	# title is optional
+					(?:[ ]* '.$this->id_class_attr_catch_re.' )?  # $5 = extra id & class attr
+							(?:\n+|\Z)
+			}xm',
+			array($this, '_stripLinkDefinitions_callback'),
+			$text);
+		return $text;
+	}
+
+	/**
+	 * Strip link definition callback
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripLinkDefinitions_callback($matches) {
+		$link_id = strtolower($matches[1]);
+		$url = $matches[2] == '' ? $matches[3] : $matches[2];
+		$this->urls[$link_id] = $url;
+		$this->titles[$link_id] =& $matches[4];
+		$this->ref_attr[$link_id] = $this->doExtraAttributes("", $dummy =& $matches[5]);
+		return ''; // String that will replace the block
+	}
+
+
+	/**
+	 * HTML block parser
+	 */
+	/**
+	 * Tags that are always treated as block tags
+	 */
+	protected $block_tags_re = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|figure|details|summary';
+
+	/**
+	 * Tags treated as block tags only if the opening tag is alone on its line
+	 */
+	protected $context_block_tags_re = 'script|noscript|style|ins|del|iframe|object|source|track|param|math|svg|canvas|audio|video';
+
+	/**
+	 * Tags where markdown="1" default to span mode:
+	 */
+	protected $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|style|math|svg';
+
+	/**
+	 * Tags that do not need to be closed.
+	 */
+	protected $auto_close_tags_re = 'hr|img|param|source|track';
+
+	/**
+	 * Hashify HTML Blocks and "clean tags".
+	 *
+	 * We only want to do this for block-level HTML tags, such as headers,
+	 * lists, and tables. That's because we still want to wrap 
    s around
+	 * "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+	 * phrase emphasis, and spans. The list of tags we're looking for is
+	 * hard-coded.
+	 *
+	 * This works by calling _HashHTMLBlocks_InMarkdown, which then calls
+	 * _HashHTMLBlocks_InHTML when it encounter block tags. When the markdown="1"
+	 * attribute is found within a tag, _HashHTMLBlocks_InHTML calls back
+	 *  _HashHTMLBlocks_InMarkdown to handle the Markdown syntax within the tag.
+	 * These two functions are calling each other. It's recursive!
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function hashHTMLBlocks($text) {
+		if ($this->no_markup) {
+			return $text;
+		}
+
+		// Call the HTML-in-Markdown hasher.
+		list($text, ) = $this->_hashHTMLBlocks_inMarkdown($text);
+
+		return $text;
+	}
+
+	/**
+	 * Parse markdown text, calling _HashHTMLBlocks_InHTML for block tags.
+	 *
+	 * *   $indent is the number of space to be ignored when checking for code
+	 *     blocks. This is important because if we don't take the indent into
+	 *     account, something like this (which looks right) won't work as expected:
+	 *
+	 *     
    
+	 *         
    
+	 *         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 )
+	 *
+	 * @param  string  $text
+	 * @param  integer $indent
+	 * @param  string  $enclosing_tag_re
+	 * @param  boolean $span
+	 * @return array
+	 */
+	protected function _hashHTMLBlocks_inMarkdown($text, $indent = 0,
+										$enclosing_tag_re = '', $span = false)
+	{
+
+		if ($text === '') return array('', '');
+
+		// Regex to check for the presense of newlines around a block tag.
+		$newline_before_re = '/(?:^\n?|\n\n)*$/';
+		$newline_after_re =
+			'{
+				^						# Start of text following the tag.
+				(?>[ ]*)?		# Optional comment.
+				[ ]*\n					# Must be followed by newline.
+			}xs';
+
+		// Regex to match any tag.
+		$block_tag_re =
+			'{
+				(					# $2: Capture whole tag.
+									# 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
+				' . ( !$span ? ' # If not in span.
+				|
+					# Indented code block
+					(?: ^[ ]*\n | ^ | \n[ ]*\n )
+					[ ]{' . ($indent + 4) . '}[^\n]* \n
+					(?>
+						(?: [ ]{' . ($indent + 4) . '}[^\n]* | [ ]* ) \n
+					)*
+				|
+					# Fenced code block marker
+					(?<= ^ | \n )
+					[ ]{0,' . ($indent + 3) . '}(?:~{3,}|`{3,})
+					[ ]*
+					(?: \.?[-_:a-zA-Z0-9]+ )? # standalone class name
+					[ ]*
+					(?: ' . $this->id_class_attr_nocatch_re . ' )? # extra attributes
+					[ ]*
+					(?= \n )
+				' : '' ) . ' # End (if not is span).
+				|
+					# Code span marker
+					# Note, this regex needs to go after backtick fenced
+					# code blocks but it should also be kept outside of the
+					# "if not in span" condition adding backticks to the parser
+					`+
+				)
+			}xs';
+
+
+		$depth = 0;		// Current depth inside the tag tree.
+		$parsed = "";	// Parsed text that will be returned.
+
+		// Loop through every tag until we find the closing tag of the parent
+		// or loop until reaching the end of text if no parent tag specified.
+		do {
+			// Split the text using the first $tag_match pattern found.
+			// Text before  pattern will be first in the array, text after
+			// pattern will be at the end, and between will be any catches made
+			// by the pattern.
+			$parts = preg_split($block_tag_re, $text, 2,
+								PREG_SPLIT_DELIM_CAPTURE);
+
+			// If in Markdown span mode, add a empty-string span-level hash
+			// after each newline to prevent triggering any block element.
+			if ($span) {
+				$void = $this->hashPart("", ':');
+				$newline = "\n$void";
+				$parts[0] = $void . str_replace("\n", $newline, $parts[0]) . $void;
+			}
+
+			$parsed .= $parts[0]; // Text before current tag.
+
+			// If end of $text has been reached. Stop loop.
+			if (count($parts) < 3) {
+				$text = "";
+				break;
+			}
+
+			$tag  = $parts[1]; // Tag to handle.
+			$text = $parts[2]; // Remaining text after current tag.
+
+			// Check for: Fenced code block marker.
+			// Note: need to recheck the whole tag to disambiguate backtick
+			// fences from code spans
+			if (preg_match('{^\n?([ ]{0,' . ($indent + 3) . '})(~{3,}|`{3,})[ ]*(?:\.?[-_:a-zA-Z0-9]+)?[ ]*(?:' . $this->id_class_attr_nocatch_re . ')?[ ]*\n?$}', $tag, $capture)) {
+				// Fenced code block marker: find matching end marker.
+				$fence_indent = strlen($capture[1]); // use captured indent in re
+				$fence_re = $capture[2]; // use captured fence in re
+				if (preg_match('{^(?>.*\n)*?[ ]{' . ($fence_indent) . '}' . $fence_re . '[ ]*(?:\n|$)}', $text,
+					$matches))
+				{
+					// End marker found: pass text unchanged until marker.
+					$parsed .= $tag . $matches[0];
+					$text = substr($text, strlen($matches[0]));
+				}
+				else {
+					// No end marker: just skip it.
+					$parsed .= $tag;
+				}
+			}
+			// Check for: Indented code block.
+			else if ($tag[0] === "\n" || $tag[0] === " ") {
+				// Indented code block: pass it unchanged, will be handled
+				// later.
+				$parsed .= $tag;
+			}
+			// Check for: Code span marker
+			// Note: need to check this after backtick fenced code blocks
+			else if ($tag[0] === "`") {
+				// Find corresponding end marker.
+				$tag_re = preg_quote($tag);
+				if (preg_match('{^(?>.+?|\n(?!\n))*?(?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);
+	}
+
+	/**
+	 * Parse HTML, calling _HashHTMLBlocks_InMarkdown for block tags.
+	 *
+	 * *   Calls $hash_method to convert any blocks.
+	 * *   Stops when the first opening tag closes.
+	 * *   $md_attr indicate if the use of the `markdown="1"` attribute is allowed.
+	 *     (it is not inside clean tags)
+	 *
+	 * Returns an array of that form: ( processed text , remaining text )
+	 * @param  string $text
+	 * @param  string $hash_method
+	 * @param  bool $md_attr Handle `markdown="1"` attribute
+	 * @return array
+	 */
+	protected function _hashHTMLBlocks_inHTML($text, $hash_method, $md_attr) {
+		if ($text === '') return array('', '');
+
+		// Regex to match `markdown` attribute inside of a tag.
+		$markdown_attr_re = '
+			{
+				\s*			# Eat whitespace before the `markdown` attribute
+				markdown
+				\s*=\s*
+				(?>
+					(["\'])		# $1: quote delimiter
+					(.*?)		# $2: attribute value
+					\1			# matching delimiter
+				|
+					([^\s>]*)	# $3: unquoted attribute value
+				)
+				()				# $4: make $3 always defined (avoid warnings)
+			}xs';
+
+		// Regex to match any tag.
+		$tag_re = '{
+				(					# $2: Capture whole tag.
+					
+								".*?"		|	# 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.
+		$base_tag_name_re = '';
+
+		// Get the name of the starting tag.
+		// (This pattern makes $base_tag_name_re safe without quoting.)
+		if (preg_match('/^<([\w:$]*)\b/', $text, $matches))
+			$base_tag_name_re = $matches[1];
+
+		// Loop through every tag until we find the corresponding closing tag.
+		do {
+			// Split the text using the first $tag_match pattern found.
+			// Text before  pattern will be first in the array, text after
+			// pattern will be at the end, and between will be any catches made
+			// by the pattern.
+			$parts = preg_split($tag_re, $text, 2, PREG_SPLIT_DELIM_CAPTURE);
+
+			if (count($parts) < 3) {
+				// End of $text reached with unbalenced tag(s).
+				// In that case, we return original text unchanged and pass the
+				// first character as filtered to prevent an infinite loop in the
+				// parent function.
+				return array($original_text[0], substr($original_text, 1));
+			}
+
+			$block_text .= $parts[0]; // Text before current tag.
+			$tag         = $parts[1]; // Tag to handle.
+			$text        = $parts[2]; // Remaining text after current tag.
+
+			// Check for: Auto-close tag (like 
    )
+			//			 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('{^contain_span_tags_re . ')\b}', $tag));
+
+					// Calculate indent before tag.
+					if (preg_match('/(?:^|\n)( *?)(?! ).*?$/', $block_text, $matches)) {
+						$strlen = $this->utf8_strlen;
+						$indent = $strlen($matches[1], 'UTF-8');
+					} else {
+						$indent = 0;
+					}
+
+					// End preceding block with this tag.
+					$block_text .= $tag;
+					$parsed .= $this->$hash_method($block_text);
+
+					// Get enclosing tag name for the ParseMarkdown function.
+					// (This pattern makes $tag_name_re safe without quoting.)
+					preg_match('/^<([\w:$]*)\b/', $tag, $matches);
+					$tag_name_re = $matches[1];
+
+					// Parse the content using the HTML-in-Markdown parser.
+					list ($block_text, $text)
+						= $this->_hashHTMLBlocks_inMarkdown($text, $indent,
+							$tag_name_re, $span_mode);
+
+					// Outdent markdown text.
+					if ($indent > 0) {
+						$block_text = preg_replace("/^[ ]{1,$indent}/m", "",
+													$block_text);
+					}
+
+					// Append tag content to parsed text.
+					if (!$span_mode) {
+						$parsed .= "\n\n$block_text\n\n";
+					} else {
+						$parsed .= (string) $block_text;
+					}
+
+					// Start over with a new block.
+					$block_text = "";
+				}
+				else $block_text .= $tag;
+			}
+
+		} while ($depth > 0);
+
+		// Hash last block text that wasn't processed inside the loop.
+		$parsed .= $this->$hash_method($block_text);
+
+		return array($parsed, $text);
+	}
+
+	/**
+	 * Called whenever a tag must be hashed when a function inserts a "clean" tag
+	 * in $text, it passes through this function and is automaticaly escaped,
+	 * blocking invalid nested overlap.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function hashClean($text) {
+		return $this->hashPart($text, 'C');
+	}
+
+	/**
+	 * Turn Markdown link shortcuts into XHTML  tags.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAnchors($text) {
+		if ($this->in_anchor) {
+			return $text;
+		}
+		$this->in_anchor = true;
+
+		// First, handle reference-style links: [link text] [id]
+		$text = preg_replace_callback('{
+			(					# wrap whole match in $1
+			  \[
+				(' . $this->nested_brackets_re . ')	# link text = $2
+			  \]
+
+			  [ ]?				# one optional space
+			  (?:\n[ ]*)?		# one optional newline followed by spaces
+
+			  \[
+				(.*?)		# id = $3
+			  \]
+			)
+			}xs',
+			array($this, '_doAnchors_reference_callback'), $text);
+
+		// Next, inline-style links: [link text](url "optional title")
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  \[
+				(' . $this->nested_brackets_re . ')	# link text = $2
+			  \]
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(.+?)>	# href = $3
+				|
+					(' . $this->nested_url_parenthesis_re . ')	# href = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# Title = $7
+				  \6		# matching quote
+				  [ \n]*	# ignore any spaces/tabs between closing quote and )
+				)?			# title is optional
+			  \)
+			  (?:[ ]? ' . $this->id_class_attr_catch_re . ' )?	 # $8 = id/class attributes
+			)
+			}xs',
+			array($this, '_doAnchors_inline_callback'), $text);
+
+		// Last, handle reference-style shortcuts: [link text]
+		// These must come last in case you've also got [link text][1]
+		// or [link text](/foo)
+		$text = preg_replace_callback('{
+			(					# wrap whole match in $1
+			  \[
+				([^\[\]]+)		# link text = $2; can\'t contain [ or ]
+			  \]
+			)
+			}xs',
+			array($this, '_doAnchors_reference_callback'), $text);
+
+		$this->in_anchor = false;
+		return $text;
+	}
+
+	/**
+	 * Callback for reference anchors
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAnchors_reference_callback($matches) {
+		$whole_match =  $matches[1];
+		$link_text   =  $matches[2];
+		$link_id     =& $matches[3];
+
+		if ($link_id == "") {
+			// for shortcut links like [this][] or [this].
+			$link_id = $link_text;
+		}
+
+		// lower-case and turn embedded newlines into spaces
+		$link_id = strtolower($link_id);
+		$link_id = preg_replace('{[ ]?\n}', ' ', $link_id);
+
+		if (isset($this->urls[$link_id])) {
+			$url = $this->urls[$link_id];
+			$url = $this->encodeURLAttribute($url);
+
+			$result = "titles[$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;
+	}
+
+	/**
+	 * Callback for inline anchors
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAnchors_inline_callback($matches) {
+		$link_text		=  $this->runSpanGamut($matches[2]);
+		$url			=  $matches[3] === '' ? $matches[4] : $matches[3];
+		$title_quote		=& $matches[6];
+		$title			=& $matches[7];
+		$attr  = $this->doExtraAttributes("a", $dummy =& $matches[8]);
+
+		// if the URL was of the form  it got caught by the HTML
+		// tag parser and hashed. Need to reverse the process before using the URL.
+		$unhashed = $this->unhash($url);
+		if ($unhashed !== $url)
+			$url = preg_replace('/^<(.*)>$/', '\1', $unhashed);
+
+		$url = $this->encodeURLAttribute($url);
+
+		$result = "encodeAttribute($title);
+			$result .=  " title=\"$title\"";
+		}
+		$result .= $attr;
+
+		$link_text = $this->runSpanGamut($link_text);
+		$result .= ">$link_text";
+
+		return $this->hashPart($result);
+	}
+
+	/**
+	 * Turn Markdown image shortcuts into  tags.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doImages($text) {
+		// First, handle reference-style labeled images: ![alt text][id]
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  !\[
+				(' . $this->nested_brackets_re . ')		# alt text = $2
+			  \]
+
+			  [ ]?				# one optional space
+			  (?:\n[ ]*)?		# one optional newline followed by spaces
+
+			  \[
+				(.*?)		# id = $3
+			  \]
+
+			)
+			}xs',
+			array($this, '_doImages_reference_callback'), $text);
+
+		// Next, handle inline images:  ![alt text](url "optional title")
+		// Don't forget: encode * and _
+		$text = preg_replace_callback('{
+			(				# wrap whole match in $1
+			  !\[
+				(' . $this->nested_brackets_re . ')		# alt text = $2
+			  \]
+			  \s?			# One optional whitespace character
+			  \(			# literal paren
+				[ \n]*
+				(?:
+					<(\S*)>	# src url = $3
+				|
+					(' . $this->nested_url_parenthesis_re . ')	# src url = $4
+				)
+				[ \n]*
+				(			# $5
+				  ([\'"])	# quote char = $6
+				  (.*?)		# title = $7
+				  \6		# matching quote
+				  [ \n]*
+				)?			# title is optional
+			  \)
+			  (?:[ ]? ' . $this->id_class_attr_catch_re . ' )?	 # $8 = id/class attributes
+			)
+			}xs',
+			array($this, '_doImages_inline_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Callback for referenced images
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doImages_reference_callback($matches) {
+		$whole_match = $matches[1];
+		$alt_text    = $matches[2];
+		$link_id     = strtolower($matches[3]);
+
+		if ($link_id === "") {
+			$link_id = strtolower($alt_text); // for shortcut links like ![this][].
+		}
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		if (isset($this->urls[$link_id])) {
+			$url = $this->encodeURLAttribute($this->urls[$link_id]);
+			$result = "\"$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;
+	}
+
+	/**
+	 * Callback for inline images
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doImages_inline_callback($matches) {
+		$alt_text		= $matches[2];
+		$url			= $matches[3] === '' ? $matches[4] : $matches[3];
+		$title_quote		=& $matches[6];
+		$title			=& $matches[7];
+		$attr  = $this->doExtraAttributes("img", $dummy =& $matches[8]);
+
+		$alt_text = $this->encodeAttribute($alt_text);
+		$url = $this->encodeURLAttribute($url);
+		$result = "\"$alt_text\"";encodeAttribute($title);
+			$result .=  " title=\"$title\""; // $title already quoted
+		}
+		$result .= $attr;
+		$result .= $this->empty_element_suffix;
+
+		return $this->hashPart($result);
+	}
+
+	/**
+	 * Process markdown headers. Redefined to add ID and class attribute support.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doHeaders($text) {
+		// Setext-style headers:
+		//  Header 1  {#header1}
+		//	  ========
+		//
+		//	  Header 2  {#header2 .class1 .class2}
+		//	  --------
+		//
+		$text = preg_replace_callback(
+			'{
+				(^.+?)								# $1: Header text
+				(?:[ ]+ ' . $this->id_class_attr_catch_re . ' )?	 # $3 = id/class attributes
+				[ ]*\n(=+|-+)[ ]*\n+				# $3: Header footer
+			}mx',
+			array($this, '_doHeaders_callback_setext'), $text);
+
+		// atx-style headers:
+		//	# Header 1        {#header1}
+		//	## Header 2       {#header2}
+		//	## Header 2 with closing hashes ##  {#header3.class1.class2}
+		//	...
+		//	###### Header 6   {.class2}
+		//
+		$text = preg_replace_callback('{
+				^(\#{1,6})	# $1 = string of #\'s
+				[ ]'.($this->hashtag_protection ? '+' : '*').'
+				(.+?)		# $2 = Header text
+				[ ]*
+				\#*			# optional closing #\'s (not counted)
+				(?:[ ]+ ' . $this->id_class_attr_catch_re . ' )?	 # $3 = id/class attributes
+				[ ]*
+				\n+
+			}xm',
+			array($this, '_doHeaders_callback_atx'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Callback for setext headers
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHeaders_callback_setext($matches) {
+		if ($matches[3] === '-' && preg_match('{^- }', $matches[1])) {
+			return $matches[0];
+		}
+
+		$level = $matches[3][0] === '=' ? 1 : 2;
+
+		$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[1]) : null;
+
+		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[2], $defaultId);
+		$block = "" . $this->runSpanGamut($matches[1]) . "";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+	/**
+	 * Callback for atx headers
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doHeaders_callback_atx($matches) {
+		$level = strlen($matches[1]);
+
+		$defaultId = is_callable($this->header_id_func) ? call_user_func($this->header_id_func, $matches[2]) : null;
+		$attr  = $this->doExtraAttributes("h$level", $dummy =& $matches[3], $defaultId);
+		$block = "" . $this->runSpanGamut($matches[2]) . "";
+		return "\n" . $this->hashBlock($block) . "\n\n";
+	}
+
+	/**
+	 * Form HTML tables.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doTables($text) {
+		$less_than_tab = $this->tab_width - 1;
+		// Find tables with leading pipe.
+		//
+		//	| Header 1 | Header 2
+		//	| -------- | --------
+		//	| Cell 1   | Cell 2
+		//	| Cell 3   | Cell 4
+		$text = preg_replace_callback('
+			{
+				^							# Start of a line
+				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
+				[|]							# Optional leading pipe (present)
+				(.+) \n						# $1: Header row (at least one pipe)
+
+				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
+				[|] ([ ]*[-:]+[-| :]*) \n	# $2: Header underline
+
+				(							# $3: Cells
+					(?>
+						[ ]*				# Allowed whitespace.
+						[|] .* \n			# Row content.
+					)*
+				)
+				(?=\n|\Z)					# Stop at final double newline.
+			}xm',
+			array($this, '_doTable_leadingPipe_callback'), $text);
+
+		// Find tables without leading pipe.
+		//
+		//	Header 1 | Header 2
+		//	-------- | --------
+		//	Cell 1   | Cell 2
+		//	Cell 3   | Cell 4
+		$text = preg_replace_callback('
+			{
+				^							# Start of a line
+				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
+				(\S.*[|].*) \n				# $1: Header row (at least one pipe)
+
+				[ ]{0,' . $less_than_tab . '}	# Allowed whitespace.
+				([-:]+[ ]*[|][-| :]*) \n	# $2: Header underline
+
+				(							# $3: Cells
+					(?>
+						.* [|] .* \n		# Row content
+					)*
+				)
+				(?=\n|\Z)					# Stop at final double newline.
+			}xm',
+			array($this, '_DoTable_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Callback for removing the leading pipe for each row
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doTable_leadingPipe_callback($matches) {
+		$head		= $matches[1];
+		$underline	= $matches[2];
+		$content	= $matches[3];
+
+		$content	= preg_replace('/^ *[|]/m', '', $content);
+
+		return $this->_doTable_callback(array($matches[0], $head, $underline, $content));
+	}
+
+	/**
+	 * Make the align attribute in a table
+	 * @param  string $alignname
+	 * @return string
+	 */
+	protected function _doTable_makeAlignAttr($alignname) {
+		if (empty($this->table_align_class_tmpl)) {
+			return " align=\"$alignname\"";
+		}
+
+		$classname = str_replace('%%', $alignname, $this->table_align_class_tmpl);
+		return " class=\"$classname\"";
+	}
+
+	/**
+	 * Calback for processing tables
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doTable_callback($matches) {
+		$head		= $matches[1];
+		$underline	= $matches[2];
+		$content	= $matches[3];
+		$attr       = [];
+
+		// Remove any tailing pipes for each line.
+		$head		= preg_replace('/[|] *$/m', '', $head);
+		$underline	= preg_replace('/[|] *$/m', '', $underline);
+		$content	= preg_replace('/[|] *$/m', '', $content);
+
+		// Reading alignement from header underline.
+		$separators	= preg_split('/ *[|] */', $underline);
+		foreach ($separators as $n => $s) {
+			if (preg_match('/^ *-+: *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('right');
+			else if (preg_match('/^ *:-+: *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('center');
+			else if (preg_match('/^ *:-+ *$/', $s))
+				$attr[$n] = $this->_doTable_makeAlignAttr('left');
+			else
+				$attr[$n] = '';
+		}
+
+		// Parsing span elements, including code spans, character escapes,
+		// and inline HTML tags, so that pipes inside those gets ignored.
+		$head		= $this->parseSpan($head);
+		$headers	= preg_split('/ *[|] */', $head);
+		$col_count	= count($headers);
+		$attr       = array_pad($attr, $col_count, '');
+
+		// Write column headers.
+		$text = "\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";
+	}
+
+	/**
+	 * Form HTML definition lists.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doDefLists($text) {
+		$less_than_tab = $this->tab_width - 1;
+
+		// Re-usable pattern to match any entire dl list:
+		$whole_list_re = '(?>
+			(								# $1 = whole list
+			  (								# $2
+				[ ]{0,' . $less_than_tab . '}
+				((?>.*\S.*\n)+)				# $3 = defined term
+				\n?
+				[ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition
+			  )
+			  (?s:.+?)
+			  (								# $4
+				  \z
+				|
+				  \n{2,}
+				  (?=\S)
+				  (?!						# Negative lookahead for another term
+					[ ]{0,' . $less_than_tab . '}
+					(?: \S.*\n )+?			# defined term
+					\n?
+					[ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition
+				  )
+				  (?!						# Negative lookahead for another definition
+					[ ]{0,' . $less_than_tab . '}:[ ]+ # colon starting definition
+				  )
+			  )
+			)
+		)'; // mx
+
+		$text = preg_replace_callback('{
+				(?>\A\n?|(?<=\n\n))
+				' . $whole_list_re . '
+			}mx',
+			array($this, '_doDefLists_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Callback for processing definition lists
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doDefLists_callback($matches) {
+		// Re-usable patterns to match list item bullets and number markers:
+		$list = $matches[1];
+
+		// Turn double returns into triple returns, so that we can make a
+		// paragraph for the last item in a list, if necessary:
+		$result = trim($this->processDefListItems($list));
+		$result = "
    \n" . $result . "\n
    ";
+		return $this->hashBlock($result) . "\n\n";
+	}
+
+	/**
+	 * Process the contents of a single definition list, splitting it
+	 * into individual term and definition list items.
+	 * @param  string $list_str
+	 * @return string
+	 */
+	protected function processDefListItems($list_str) {
+
+		$less_than_tab = $this->tab_width - 1;
+
+		// Trim trailing blank lines:
+		$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
+
+		// Process definition terms.
+		$list_str = preg_replace_callback('{
+			(?>\A\n?|\n\n+)						# leading line
+			(									# definition terms = $1
+				[ ]{0,' . $less_than_tab . '}	# leading whitespace
+				(?!\:[ ]|[ ])					# negative lookahead for a definition
+												#   mark (colon) or more whitespace.
+				(?> \S.* \n)+?					# actual term (not whitespace).
+			)
+			(?=\n?[ ]{0,3}:[ ])					# lookahead for following line feed
+												#   with a definition mark.
+			}xm',
+			array($this, '_processDefListItems_callback_dt'), $list_str);
+
+		// Process actual definitions.
+		$list_str = preg_replace_callback('{
+			\n(\n+)?							# leading line = $1
+			(									# marker space = $2
+				[ ]{0,' . $less_than_tab . '}	# whitespace before colon
+				\:[ ]+							# definition mark (colon)
+			)
+			((?s:.+?))							# definition text = $3
+			(?= \n+ 							# stop at next definition mark,
+				(?:								# next term or end of text
+					[ ]{0,' . $less_than_tab . '} \:[ ]	|
+					
     | \z
+				)
+			)
+			}xm',
+			array($this, '_processDefListItems_callback_dd'), $list_str);
+
+		return $list_str;
+	}
+
+	/**
+	 * Callback for 
     elements in definition lists
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _processDefListItems_callback_dt($matches) {
+		$terms = explode("\n", trim($matches[1]));
+		$text = '';
+		foreach ($terms as $term) {
+			$term = $this->runSpanGamut(trim($term));
+			$text .= "\n
    " . $term . "
    ";
+		}
+		return $text . "\n";
+	}
+
+	/**
+	 * Callback for 
     elements in definition lists
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _processDefListItems_callback_dd($matches) {
+		$leading_line	= $matches[1];
+		$marker_space	= $matches[2];
+		$def			= $matches[3];
+
+		if ($leading_line || preg_match('/\n{2,}/', $def)) {
+			// Replace marker with the appropriate whitespace indentation
+			$def = str_repeat(' ', strlen($marker_space)) . $def;
+			$def = $this->runBlockGamut($this->outdent($def . "\n\n"));
+			$def = "\n". $def ."\n";
+		}
+		else {
+			$def = rtrim($def);
+			$def = $this->runSpanGamut($this->outdent($def));
+		}
+
+		return "\n
    " . $def . "
    \n";
+	}
+
+	/**
+	 * Adding the fenced code block syntax to regular Markdown:
+	 *
+	 * ~~~
+	 * Code block
+	 * ~~~
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doFencedCodeBlocks($text) {
+
+		$text = preg_replace_callback('{
+				(?:\n|\A)
+				# 1: Opening marker
+				(
+					(?:~{3,}|`{3,}) # 3 or more tildes/backticks.
+				)
+				[ ]*
+				(?:
+					\.?([-_:a-zA-Z0-9]+) # 2: standalone class name
+				)?
+				[ ]*
+				(?:
+					' . $this->id_class_attr_catch_re . ' # 3: Extra attributes
+				)?
+				[ ]* \n # Whitespace and newline following marker.
+
+				# 4: Content
+				(
+					(?>
+						(?!\1 [ ]* \n)	# Not a closing marker.
+						.*\n+
+					)+
+				)
+
+				# Closing marker.
+				\1 [ ]* (?= \n )
+			}xm',
+			array($this, '_doFencedCodeBlocks_callback'), $text);
+
+		return $text;
+	}
+
+	/**
+	 * Callback to process fenced code blocks
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doFencedCodeBlocks_callback($matches) {
+		$classname =& $matches[2];
+		$attrs     =& $matches[3];
+		$codeblock = $matches[4];
+
+		if ($this->code_block_content_func) {
+			$codeblock = call_user_func($this->code_block_content_func, $codeblock, $classname);
+		} else {
+			$codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+		}
+
+		$codeblock = preg_replace_callback('/^\n+/',
+			array($this, '_doFencedCodeBlocks_newlines'), $codeblock);
+
+		$classes = array();
+		if ($classname !== "") {
+			if ($classname[0] === '.') {
+				$classname = substr($classname, 1);
+			}
+			$classes[] = $this->code_class_prefix . $classname;
+		}
+		$attr_str = $this->doExtraAttributes($this->code_attr_on_pre ? "pre" : "code", $attrs, null, $classes);
+		$pre_attr_str  = $this->code_attr_on_pre ? $attr_str : '';
+		$code_attr_str = $this->code_attr_on_pre ? '' : $attr_str;
+		$codeblock  = "$codeblock
    ";
+
+		return "\n\n".$this->hashBlock($codeblock)."\n\n";
+	}
+
+	/**
+	 * Replace new lines in fenced code blocks
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doFencedCodeBlocks_newlines($matches) {
+		return str_repeat("empty_element_suffix",
+			strlen($matches[0]));
+	}
+
+	/**
+	 * Redefining emphasis markers so that emphasis by underscore does not
+	 * work in the middle of a word.
+	 * @var array
+	 */
+	protected $em_relist = array(
+		''  => '(?:(? '(? '(? '(?:(? '(? '(? '(?:(? '(? '(? tags
+	 * @return string       HTML output
+	 */
+	protected function formParagraphs($text, $wrap_in_p = true) {
+		// Strip leading and trailing lines:
+		$text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+		$grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+		// Wrap 
     tags and unhashify HTML blocks
+		foreach ($grafs as $key => $value) {
+			$value = trim($this->runSpanGamut($value));
+
+			// Check if this should be enclosed in a paragraph.
+			// Clean tag hashes & block tag hashes are left alone.
+			$is_p = $wrap_in_p && !preg_match('/^B\x1A[0-9]+B|^C\x1A[0-9]+C$/', $value);
+
+			if ($is_p) {
+				$value = "
    $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 - Strips link definitions from text, stores the URLs and
+	 * titles in hash references.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripFootnotes($text) {
+		$less_than_tab = $this->tab_width - 1;
+
+		// Link defs are in the form: [^id]: url "optional title"
+		$text = preg_replace_callback('{
+			^[ ]{0,' . $less_than_tab . '}\[\^(.+?)\][ ]?:	# note_id = $1
+			  [ ]*
+			  \n?					# maybe *one* newline
+			(						# text = $2 (no blank lines allowed)
+				(?:
+					.+				# actual text
+				|
+					\n				# newlines but
+					(?!\[.+?\][ ]?:\s)# negative lookahead for footnote or link definition marker.
+					(?!\n+[ ]{0,3}\S)# ensure line is not blank and followed
+									# by non-indented content
+				)*
+			)
+			}xm',
+			array($this, '_stripFootnotes_callback'),
+			$text);
+		return $text;
+	}
+
+	/**
+	 * Callback for stripping footnotes
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripFootnotes_callback($matches) {
+		$note_id = $this->fn_id_prefix . $matches[1];
+		$this->footnotes[$note_id] = $this->outdent($matches[2]);
+		return ''; // String that will replace the block
+	}
+
+	/**
+	 * Replace footnote references in $text [^id] with a special text-token
+	 * which will be replaced by the actual footnote marker in appendFootnotes.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doFootnotes($text) {
+		if (!$this->in_anchor) {
+			$text = preg_replace('{\[\^(.+?)\]}', "F\x1Afn:\\1\x1A:", $text);
+		}
+		return $text;
+	}
+
+	/**
+	 * Append footnote list to text
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function appendFootnotes($text) {
+		$text = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
+			array($this, '_appendFootnotes_callback'), $text);
+
+		if ( ! empty( $this->footnotes_ordered ) ) {
+			$this->_doFootnotes();
+			if ( ! $this->omit_footnotes ) {
+				$text .= "\n\n";
+				$text .= "
    \n";
+				$text .= "empty_element_suffix . "\n";
+				$text .= $this->footnotes_assembled;
+				$text .= "
    ";
+			}
+		}
+		return $text;
+	}
+
+
+	/**
+	 * Generates the HTML for footnotes.  Called by appendFootnotes, even if
+	 * footnotes are not being appended.
+	 * @return void
+	 */
+	protected function _doFootnotes() {
+		$attr = array();
+		if ($this->fn_backlink_class !== "") {
+			$class = $this->fn_backlink_class;
+			$class = $this->encodeAttribute($class);
+			$attr['class'] = " class=\"$class\"";
+		}
+		$attr['role'] = " role=\"doc-backlink\"";
+		$num = 0;
+
+		$text = "
      \n\n";
+		while (!empty($this->footnotes_ordered)) {
+			$footnote = reset($this->footnotes_ordered);
+			$note_id = key($this->footnotes_ordered);
+			unset($this->footnotes_ordered[$note_id]);
+			$ref_count = $this->footnotes_ref_count[$note_id];
+			unset($this->footnotes_ref_count[$note_id]);
+			unset($this->footnotes[$note_id]);
+
+			$footnote .= "\n"; // Need to append newline before parsing.
+			$footnote = $this->runBlockGamut("$footnote\n");
+			$footnote = preg_replace_callback('{F\x1Afn:(.*?)\x1A:}',
+				array($this, '_appendFootnotes_callback'), $footnote);
+
+			$num++;
+			$note_id = $this->encodeAttribute($note_id);
+
+			// Prepare backlink, multiple backlinks if multiple references
+			// Do not create empty backlinks if the html is blank
+			$backlink = "";
+			if (!empty($this->fn_backlink_html)) {
+				for ($ref_num = 1; $ref_num <= $ref_count; ++$ref_num) {
+					if (!empty($this->fn_backlink_title)) {
+						$attr['title'] = ' title="' . $this->encodeAttribute($this->fn_backlink_title) . '"';
+					}
+					if (!empty($this->fn_backlink_label)) {
+						$attr['label'] = ' aria-label="' . $this->encodeAttribute($this->fn_backlink_label) . '"';
+					}
+					$parsed_attr = $this->parseFootnotePlaceholders(
+						implode('', $attr),
+						$num,
+						$ref_num
+					);
+					$backlink_text = $this->parseFootnotePlaceholders(
+						$this->fn_backlink_html,
+						$num,
+						$ref_num
+					);
+					$ref_count_mark = $ref_num > 1 ? $ref_num : '';
+					$backlink .= " $backlink_text";
+				}
+				$backlink = trim($backlink);
+			}
+
+			// Add backlink to last paragraph; create new paragraph if needed.
+			if (!empty($backlink)) {
+				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";
+
+		$this->footnotes_assembled = $text;
+	}
+
+	/**
+	 * Callback for appending footnotes
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _appendFootnotes_callback($matches) {
+		$node_id = $this->fn_id_prefix . $matches[1];
+
+		// Create footnote marker only if it has a corresponding footnote *and*
+		// the footnote hasn't been used by another marker.
+		if (isset($this->footnotes[$node_id])) {
+			$num =& $this->footnotes_numbers[$node_id];
+			if (!isset($num)) {
+				// Transfer footnote content to the ordered list and give it its
+				// number
+				$this->footnotes_ordered[$node_id] = $this->footnotes[$node_id];
+				$this->footnotes_ref_count[$node_id] = 1;
+				$num = $this->footnote_counter++;
+				$ref_count_mark = '';
+			} else {
+				$ref_count_mark = $this->footnotes_ref_count[$node_id] += 1;
+			}
+
+			$attr = "";
+			if ($this->fn_link_class !== "") {
+				$class = $this->fn_link_class;
+				$class = $this->encodeAttribute($class);
+				$attr .= " class=\"$class\"";
+			}
+			if ($this->fn_link_title !== "") {
+				$title = $this->fn_link_title;
+				$title = $this->encodeAttribute($title);
+				$attr .= " title=\"$title\"";
+			}
+			$attr .= " role=\"doc-noteref\"";
+
+			$attr = str_replace("%%", $num, $attr);
+			$node_id = $this->encodeAttribute($node_id);
+
+			return
+				"".
+				"$num".
+				"";
+		}
+
+		return "[^" . $matches[1] . "]";
+	}
+
+	/**
+	 * Build footnote label by evaluating any placeholders.
+	 * - ^^  footnote number
+	 * - %%  footnote reference number (Nth reference to footnote number)
+	 * @param  string $label
+	 * @param  int    $footnote_number
+	 * @param  int    $reference_number
+	 * @return string
+	 */
+	protected function parseFootnotePlaceholders($label, $footnote_number, $reference_number) {
+		return str_replace(
+			array('^^', '%%'),
+			array($footnote_number, $reference_number),
+			$label
+		);
+	}
+
+
+	/**
+	 * Abbreviations - strips abbreviations from text, stores titles in hash
+	 * references.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function stripAbbreviations($text) {
+		$less_than_tab = $this->tab_width - 1;
+
+		// Link defs are in the form: [id]*: url "optional title"
+		$text = preg_replace_callback('{
+			^[ ]{0,' . $less_than_tab . '}\*\[(.+?)\][ ]?:	# abbr_id = $1
+			(.*)					# text = $2 (no blank lines allowed)
+			}xm',
+			array($this, '_stripAbbreviations_callback'),
+			$text);
+		return $text;
+	}
+
+	/**
+	 * Callback for stripping abbreviations
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _stripAbbreviations_callback($matches) {
+		$abbr_word = $matches[1];
+		$abbr_desc = $matches[2];
+		if ($this->abbr_word_re) {
+			$this->abbr_word_re .= '|';
+		}
+		$this->abbr_word_re .= preg_quote($abbr_word);
+		$this->abbr_desciptions[$abbr_word] = trim($abbr_desc);
+		return ''; // String that will replace the block
+	}
+
+	/**
+	 * Find defined abbreviations in text and wrap them in  elements.
+	 * @param  string $text
+	 * @return string
+	 */
+	protected function doAbbreviations($text) {
+		if ($this->abbr_word_re) {
+			// cannot use the /x modifier because abbr_word_re may
+			// contain significant spaces:
+			$text = preg_replace_callback('{' .
+				'(?abbr_word_re . ')' .
+				'(?![\w\x1A])' .
+				'}',
+				array($this, '_doAbbreviations_callback'), $text);
+		}
+		return $text;
+	}
+
+	/**
+	 * Callback for processing abbreviations
+	 * @param  array $matches
+	 * @return string
+	 */
+	protected function _doAbbreviations_callback($matches) {
+		$abbr = $matches[0];
+		if (isset($this->abbr_desciptions[$abbr])) {
+			$desc = $this->abbr_desciptions[$abbr];
+			if (empty($desc)) {
+				return $this->hashPart("$abbr");
+			}
+			$desc = $this->encodeAttribute($desc);
+			return $this->hashPart("$abbr");
+		}
+		return $matches[0];
+	}
+}
diff --git a/mdlibs/MarkdownInterface.inc.php b/mdlibs/MarkdownInterface.inc.php
new file mode 100644
index 0000000..c4e9ac7
--- /dev/null
+++ b/mdlibs/MarkdownInterface.inc.php
@@ -0,0 +1,9 @@
+
+ * @copyright 2004-2021 Michel Fortin 
+ * @copyright (Original Markdown) 2004-2006 John Gruber 
+ */
+
+namespace mdlibs;
+
+/**
+ * Markdown Parser Interface
+ */
+interface MarkdownInterface {
+	/**
+	 * Initialize the parser and return the result of its transform method.
+	 * This will work fine for derived classes too.
+	 *
+	 * @api
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	public static function defaultTransform($text);
+
+	/**
+	 * Main function. Performs some preprocessing on the input text
+	 * and pass it through the document gamut.
+	 *
+	 * @api
+	 *
+	 * @param  string $text
+	 * @return string
+	 */
+	public function transform($text);
+}
diff --git a/mktree.sh b/mktree.sh
new file mode 100755
index 0000000..6700cc8
--- /dev/null
+++ b/mktree.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+URL="https://codeberg.org/speedie/speedwm/raw/branch/master"
+tree -I md5 -f --noreport --charset ascii | grep -vE "profiles|metadata|md5|Manifest|README|xml|repo_name|conf|directories|push|tree|LICENSE" | sed -e 's/| \+/  /g' -e 's/[|`]-\+/ */g' -e 's:\(* \)\(\(.*/\)\([^/]\+\)\):\1[\4](\2):g' | tail -n+2 | sed "s|]([.]|](${URL}|g"
diff --git a/pages/Home.txt b/pages/Home.txt
new file mode 100644
index 0000000..de6a91f
--- /dev/null
+++ b/pages/Home.txt
@@ -0,0 +1,4 @@
+Welcome to the speedie.gq wiki!
+-------------------------------
+
+Welcome to the very much work in progress speedie.gq wiki!