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add PHP Markdown 1.0.1j

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+<?php
+#
+# Markdown - A text-to-HTML conversion tool for web writers
+#
+# PHP Markdown
+# Copyright (c) 2004-2007 Michel Fortin
+# <http://www.michelf.com/projects/php-markdown/>
+#
+# Original Markdown
+# Copyright (c) 2004-2006 John Gruber
+# <http://daringfireball.net/projects/markdown/>
+#
+
+
+define( 'MARKDOWN_VERSION', "1.0.1j" ); # Tue 4 Sep 2007
+
+
+#
+# Global default settings:
+#
+
+# Change to ">" for HTML output
+@define( 'MARKDOWN_EMPTY_ELEMENT_SUFFIX', " />");
+
+# Define the width of a tab for code blocks.
+@define( 'MARKDOWN_TAB_WIDTH', 4 );
+
+
+#
+# WordPress settings:
+#
+
+# Change to false to remove Markdown from posts and/or comments.
+@define( 'MARKDOWN_WP_POSTS', true );
+@define( 'MARKDOWN_WP_COMMENTS', true );
+
+
+
+### Standard Function Interface ###
+
+@define( 'MARKDOWN_PARSER_CLASS', 'Markdown_Parser' );
+
+function Markdown($text) {
+#
+# Initialize the parser and return the result of its transform method.
+#
+ # Setup static parser variable.
+ static $parser;
+ if (!isset($parser)) {
+ $parser_class = MARKDOWN_PARSER_CLASS;
+ $parser = new $parser_class;
+ }
+
+ # Transform text using parser.
+ return $parser->transform($text);
+}
+
+
+### WordPress Plugin Interface ###
+
+/*
+Plugin Name: Markdown
+Plugin URI: http://www.michelf.com/projects/php-markdown/
+Description: <a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a> allows you to write using an easy-to-read, easy-to-write plain text format. Based on the original Perl version by <a href="http://daringfireball.net/">John Gruber</a>. <a href="http://www.michelf.com/projects/php-markdown/">More...</a>
+Version: 1.0.1j
+Author: Michel Fortin
+Author URI: http://www.michelf.com/
+*/
+
+if (isset($wp_version)) {
+ # More details about how it works here:
+ # <http://www.michelf.com/weblog/2005/wordpress-text-flow-vs-markdown/>
+
+ # Post content and excerpts
+ # - Remove WordPress paragraph generator.
+ # - Run Markdown on excerpt, then remove all tags.
+ # - Add paragraph tag around the excerpt, but remove it for the excerpt rss.
+ if (MARKDOWN_WP_POSTS) {
+ remove_filter('the_content', 'wpautop');
+ remove_filter('the_content_rss', 'wpautop');
+ remove_filter('the_excerpt', 'wpautop');
+ add_filter('the_content', 'Markdown', 6);
+ add_filter('the_content_rss', 'Markdown', 6);
+ add_filter('get_the_excerpt', 'Markdown', 6);
+ add_filter('get_the_excerpt', 'trim', 7);
+ add_filter('the_excerpt', 'mdwp_add_p');
+ add_filter('the_excerpt_rss', 'mdwp_strip_p');
+
+ remove_filter('content_save_pre', 'balanceTags', 50);
+ remove_filter('excerpt_save_pre', 'balanceTags', 50);
+ add_filter('the_content', 'balanceTags', 50);
+ add_filter('get_the_excerpt', 'balanceTags', 9);
+ }
+
+ # Comments
+ # - Remove WordPress paragraph generator.
+ # - Remove WordPress auto-link generator.
+ # - Scramble important tags before passing them to the kses filter.
+ # - Run Markdown on excerpt then remove paragraph tags.
+ if (MARKDOWN_WP_COMMENTS) {
+ remove_filter('comment_text', 'wpautop', 30);
+ remove_filter('comment_text', 'make_clickable');
+ add_filter('pre_comment_content', 'Markdown', 6);
+ add_filter('pre_comment_content', 'mdwp_hide_tags', 8);
+ add_filter('pre_comment_content', 'mdwp_show_tags', 12);
+ add_filter('get_comment_text', 'Markdown', 6);
+ add_filter('get_comment_excerpt', 'Markdown', 6);
+ add_filter('get_comment_excerpt', 'mdwp_strip_p', 7);
+
+ global $mdwp_hidden_tags, $mdwp_placeholders;
+ $mdwp_hidden_tags = explode(' ',
+ '<p> </p> <pre> </pre> <ol> </ol> <ul> </ul> <li> </li>');
+ $mdwp_placeholders = explode(' ', str_rot13(
+ 'pEj07ZbbBZ U1kqgh4w4p pre2zmeN6K QTi31t9pre ol0MP1jzJR '.
+ 'ML5IjmbRol ulANi1NsGY J7zRLJqPul liA8ctl16T K9nhooUHli'));
+ }
+
+ function mdwp_add_p($text) {
+ if (!preg_match('{^$|^<(p|ul|ol|dl|pre|blockquote)>}i', $text)) {
+ $text = '<p>'.$text.'</p>';
+ $text = preg_replace('{\n{2,}}', "</p>\n\n<p>", $text);
+ }
+ return $text;
+ }
+
+ function mdwp_strip_p($t) { return preg_replace('{</?p>}i', '', $t); }
+
+ function mdwp_hide_tags($text) {
+ global $mdwp_hidden_tags, $mdwp_placeholders;
+ return str_replace($mdwp_hidden_tags, $mdwp_placeholders, $text);
+ }
+ function mdwp_show_tags($text) {
+ global $mdwp_hidden_tags, $mdwp_placeholders;
+ return str_replace($mdwp_placeholders, $mdwp_hidden_tags, $text);
+ }
+}
+
+
+### bBlog Plugin Info ###
+
+function identify_modifier_markdown() {
+ return array(
+ 'name' => 'markdown',
+ 'type' => 'modifier',
+ 'nicename' => 'Markdown',
+ 'description' => 'A text-to-HTML conversion tool for web writers',
+ 'authors' => 'Michel Fortin and John Gruber',
+ 'licence' => 'BSD-like',
+ 'version' => MARKDOWN_VERSION,
+ 'help' => '<a href="http://daringfireball.net/projects/markdown/syntax">Markdown syntax</a> allows you to write using an easy-to-read, easy-to-write plain text format. Based on the original Perl version by <a href="http://daringfireball.net/">John Gruber</a>. <a href="http://www.michelf.com/projects/php-markdown/">More...</a>'
+ );
+}
+
+
+### Smarty Modifier Interface ###
+
+function smarty_modifier_markdown($text) {
+ return Markdown($text);
+}
+
+
+### Textile Compatibility Mode ###
+
+# Rename this file to "classTextile.php" and it can replace Textile everywhere.
+
+if (strcasecmp(substr(__FILE__, -16), "classTextile.php") == 0) {
+ # Try to include PHP SmartyPants. Should be in the same directory.
+ @include_once 'smartypants.php';
+ # Fake Textile class. It calls Markdown instead.
+ class Textile {
+ function TextileThis($text, $lite='', $encode='') {
+ if ($lite == '' && $encode == '') $text = Markdown($text);
+ if (function_exists('SmartyPants')) $text = SmartyPants($text);
+ return $text;
+ }
+ # Fake restricted version: restrictions are not supported for now.
+ function TextileRestricted($text, $lite='', $noimage='') {
+ return $this->TextileThis($text, $lite);
+ }
+ # Workaround to ensure compatibility with TextPattern 4.0.3.
+ function blockLite($text) { return $text; }
+ }
+}
+
+
+
+#
+# Markdown Parser Class
+#
+
+class Markdown_Parser {
+
+ # Regex to match balanced [brackets].
+ # Needed to insert a maximum bracked depth while converting to PHP.
+ var $nested_brackets_depth = 6;
+ var $nested_brackets;
+
+ var $nested_url_parenthesis_depth = 4;
+ var $nested_url_parenthesis;
+
+ # Table of hash values for escaped characters:
+ var $escape_chars = '\`*_{}[]()>#+-.!';
+
+ # Change to ">" for HTML output.
+ var $empty_element_suffix = MARKDOWN_EMPTY_ELEMENT_SUFFIX;
+ var $tab_width = MARKDOWN_TAB_WIDTH;
+
+ # Change to `true` to disallow markup or entities.
+ var $no_markup = false;
+ var $no_entities = false;
+
+
+ function Markdown_Parser() {
+ #
+ # Constructor function. Initialize appropriate member variables.
+ #
+ $this->_initDetab();
+
+ $this->nested_brackets =
+ str_repeat('(?>[^\[\]]+|\[', $this->nested_brackets_depth).
+ str_repeat('\])*', $this->nested_brackets_depth);
+
+ $this->nested_url_parenthesis =
+ str_repeat('(?>[^()\s]+|\(', $this->nested_url_parenthesis_depth).
+ str_repeat('(?>\)))*', $this->nested_url_parenthesis_depth);
+
+ # Sort document, block, and span gamut in ascendent priority order.
+ asort($this->document_gamut);
+ asort($this->block_gamut);
+ asort($this->span_gamut);
+ }
+
+
+ # Internal hashes used during transformation.
+ var $urls = array();
+ var $titles = array();
+ var $html_hashes = array();
+
+ # Status flag to avoid invalid nesting.
+ var $in_anchor = false;
+
+
+ function transform($text) {
+ #
+ # Main function. The order in which other subs are called here is
+ # essential. Link and image substitutions need to happen before
+ # _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
+ # and <img> tags get encoded.
+ #
+ # Clear the global hashes. If we don't clear these, you get conflicts
+ # from other articles when generating a page which contains more than
+ # one article (e.g. an index page that shows the N most recent
+ # articles):
+ $this->urls = array();
+ $this->titles = array();
+ $this->html_hashes = array();
+
+ # 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);
+ }
+
+ return $text . "\n";
+ }
+
+ var $document_gamut = array(
+ # Strip link definitions, store in hashes.
+ "stripLinkDefinitions" => 20,
+
+ "runBasicBlockGamut" => 30,
+ );
+
+
+ function stripLinkDefinitions($text) {
+ #
+ # Strips link definitions from text, stores the URLs and titles in
+ # hash references.
+ #
+ $less_than_tab = $this->tab_width - 1;
+
+ # Link defs are in the form: ^[id]: url "optional title"
+ $text = preg_replace_callback('{
+ ^[ ]{0,'.$less_than_tab.'}\[(.+)\][ ]?: # id = $1
+ [ ]*
+ \n? # maybe *one* newline
+ [ ]*
+ <?(\S+?)>? # url = $2
+ [ ]*
+ \n? # maybe one newline
+ [ ]*
+ (?:
+ (?<=\s) # lookbehind for whitespace
+ ["(]
+ (.*?) # title = $3
+ [")]
+ [ ]*
+ )? # title is optional
+ (?:\n+|\Z)
+ }xm',
+ array(&$this, '_stripLinkDefinitions_callback'),
+ $text);
+ return $text;
+ }
+ function _stripLinkDefinitions_callback($matches) {
+ $link_id = strtolower($matches[1]);
+ $this->urls[$link_id] = $this->encodeAmpsAndAngles($matches[2]);
+ if (isset($matches[3]))
+ $this->titles[$link_id] = str_replace('"', '&quot;', $matches[3]);
+ return ''; # String that will replace the block
+ }
+
+
+ function hashHTMLBlocks($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 <p>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 = 'ins|del';
+ $block_tags_b = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|'.
+ 'script|noscript|form|fieldset|iframe|math';
+
+ # 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('
+ </\2\s*> # 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.:
+ # <div>
+ # <div>
+ # tags for inner block must be indented.
+ # </div>
+ # </div>
+ #
+ # 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 `<div>` and stop at the first `</div>`.
+ $text = preg_replace_callback('{(?>
+ (?>
+ (?<=\n\n) # Starting after a blank line
+ | # or
+ \A\n? # the beginning of the doc
+ )
+ ( # save in $1
+
+ # Match from `\n<tag>` to `</tag>\n`, handling nested tags
+ # in between.
+
+ [ ]{0,'.$less_than_tab.'}
+ <('.$block_tags_b.')# start tag = $2
+ '.$attr.'> # attributes followed by > and \n
+ '.$content.' # content, support nesting
+ </\2> # the matching end tag
+ [ ]* # trailing spaces/tabs
+ (?=\n+|\Z) # followed by a newline or end of document
+
+ | # Special version for tags of group a.
+
+ [ ]{0,'.$less_than_tab.'}
+ <('.$block_tags_a.')# start tag = $3
+ '.$attr.'>[ ]*\n # attributes followed by >
+ '.$content2.' # content, support nesting
+ </\3> # the matching end tag
+ [ ]* # trailing spaces/tabs
+ (?=\n+|\Z) # followed by a newline or end of document
+
+ | # Special case just for <hr />. It was easier to make a special
+ # case than to make the other regex more complicated.
+
+ [ ]{0,'.$less_than_tab.'}
+ <(hr) # start tag = $2
+ \b # word break
+ ([^<>])*? #
+ /?> # the matching end tag
+ [ ]*
+ (?=\n{2,}|\Z) # followed by a blank line or end of document
+
+ | # Special case for standalone HTML comments:
+
+ [ ]{0,'.$less_than_tab.'}
+ (?s:
+ <!-- .*? -->
+ )
+ [ ]*
+ (?=\n{2,}|\Z) # followed by a blank line or end of document
+
+ | # PHP and ASP-style processor instructions (<? and <%)
+
+ [ ]{0,'.$less_than_tab.'}
+ (?s:
+ <([?%]) # $2
+ .*?
+ \2>
+ )
+ [ ]*
+ (?=\n{2,}|\Z) # followed by a blank line or end of document
+
+ )
+ )}Sxmi',
+ array(&$this, '_hashHTMLBlocks_callback'),
+ $text);
+
+ return $text;
+ }
+ function _hashHTMLBlocks_callback($matches) {
+ $text = $matches[1];
+ $key = $this->hashBlock($text);
+ return "\n\n$key\n\n";
+ }
+
+
+ function hashPart($text, $boundary = 'X') {
+ #
+ # Called whenever a tag must be hashed when a function insert an atomic
+ # element in the text stream. Passing $text to through this function gives
+ # a unique text-token which will be reverted back when calling unhash.
+ #
+ # The $boundary argument specify what character should be used to surround
+ # the token. By convension, "B" is used for block elements that needs not
+ # to be wrapped into paragraph tags at the end, ":" is used for elements
+ # that are word separators and "S" is used for general span-level elements.
+ #
+ # 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 $key; # String that will replace the tag.
+ }
+
+
+ function hashBlock($text) {
+ #
+ # Shortcut function for hashPart with block-level boundaries.
+ #
+ return $this->hashPart($text, 'B');
+ }
+
+
+ var $block_gamut = array(
+ #
+ # These are all the transformations that form block-level
+ # tags like paragraphs, headers, and list items.
+ #
+ "doHeaders" => 10,
+ "doHorizontalRules" => 20,
+
+ "doLists" => 40,
+ "doCodeBlocks" => 50,
+ "doBlockQuotes" => 60,
+ );
+
+ function runBlockGamut($text) {
+ #
+ # Run block gamut tranformations.
+ #
+ # We need to escape raw HTML in Markdown source before doing anything
+ # else. This need to be done for each block, and not only at the
+ # begining in the Markdown function since hashed blocks can be part of
+ # list items and could have been indented. Indented blocks would have
+ # been seen as a code block in a previous pass of hashHTMLBlocks.
+ $text = $this->hashHTMLBlocks($text);
+
+ return $this->runBasicBlockGamut($text);
+ }
+
+ function runBasicBlockGamut($text) {
+ #
+ # Run block gamut tranformations, without hashing HTML blocks. This is
+ # useful when HTML blocks are known to be already hashed, like in the first
+ # whole-document pass.
+ #
+ foreach ($this->block_gamut as $method => $priority) {
+ $text = $this->$method($text);
+ }
+
+ # Finally form paragraph and restore hashed blocks.
+ $text = $this->formParagraphs($text);
+
+ return $text;
+ }
+
+
+ function doHorizontalRules($text) {
+ # Do Horizontal Rules:
+ return preg_replace(
+ '{
+ ^[ ]{0,3} # Leading space
+ ([*-_]) # $1: First marker
+ (?> # Repeated marker group
+ [ ]{0,2} # Zero, one, or two spaces.
+ \1 # Marker character
+ ){2,} # Group repeated at least twice
+ [ ]* # Tailing spaces
+ $ # End of line.
+ }mx',
+ "\n".$this->hashBlock("<hr$this->empty_element_suffix")."\n",
+ $text);
+ }
+
+
+ var $span_gamut = array(
+ #
+ # These are all the transformations that occur *within* block-level
+ # tags like paragraphs, headers, and list items.
+ #
+ # Process character escapes, code spans, and inline HTML
+ # in one shot.
+ "parseSpan" => -30,
+
+ # Process anchor and image tags. Images must come first,
+ # because ![foo][f] looks like an anchor.
+ "doImages" => 10,
+ "doAnchors" => 20,
+
+ # Make links out of things like `<http://example.com/>`
+ # Must come after doAnchors, because you can use < and >
+ # delimiters in inline links like [this](<url>).
+ "doAutoLinks" => 30,
+ "encodeAmpsAndAngles" => 40,
+
+ "doItalicsAndBold" => 50,
+ "doHardBreaks" => 60,
+ );
+
+ function runSpanGamut($text) {
+ #
+ # Run span gamut tranformations.
+ #
+ foreach ($this->span_gamut as $method => $priority) {
+ $text = $this->$method($text);
+ }
+
+ return $text;
+ }
+
+
+ function doHardBreaks($text) {
+ # Do hard breaks:
+ return preg_replace_callback('/ {2,}\n/',
+ array(&$this, '_doHardBreaks_callback'), $text);
+ }
+ function _doHardBreaks_callback($matches) {
+ return $this->hashPart("<br$this->empty_element_suffix\n");
+ }
+
+
+ function doAnchors($text) {
+ #
+ # Turn Markdown link shortcuts into XHTML <a> tags.
+ #
+ if ($this->in_anchor) return $text;
+ $this->in_anchor = true;
+
+ #
+ # First, handle reference-style links: [link text] [id]
+ #
+ $text = preg_replace_callback('{
+ ( # wrap whole match in $1
+ \[
+ ('.$this->nested_brackets.') # link text = $2
+ \]
+
+ [ ]? # 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
+ \[
+ ('.$this->nested_brackets.') # link text = $2
+ \]
+ \( # literal paren
+ [ ]*
+ (?:
+ <(\S*)> # href = $3
+ |
+ ('.$this->nested_url_parenthesis.') # href = $4
+ )
+ [ ]*
+ ( # $5
+ ([\'"]) # quote char = $6
+ (.*?) # Title = $7
+ \6 # matching quote
+ [ ]* # ignore any spaces/tabs between closing quote and )
+ )? # title is optional
+ \)
+ )
+ }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 test][1]
+ # or [link test](/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 $text;
+ }
+ function _doAnchors_reference_callback($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 = $this->encodeAmpsAndAngles($url);
+
+ $result = "<a href=\"$url\"";
+ if ( isset( $this->titles[$link_id] ) ) {
+ $title = $this->titles[$link_id];
+ $title = $this->encodeAmpsAndAngles($title);
+ $result .= " title=\"$title\"";
+ }
+
+ $link_text = $this->runSpanGamut($link_text);
+ $result .= ">$link_text</a>";
+ $result = $this->hashPart($result);
+ }
+ else {
+ $result = $whole_match;
+ }
+ return $result;
+ }
+ function _doAnchors_inline_callback($matches) {
+ $whole_match = $matches[1];
+ $link_text = $this->runSpanGamut($matches[2]);
+ $url = $matches[3] == '' ? $matches[4] : $matches[3];
+ $title =& $matches[7];
+
+ $url = $this->encodeAmpsAndAngles($url);
+
+ $result = "<a href=\"$url\"";
+ if (isset($title)) {
+ $title = str_replace('"', '&quot;', $title);
+ $title = $this->encodeAmpsAndAngles($title);
+ $result .= " title=\"$title\"";
+ }
+
+ $link_text = $this->runSpanGamut($link_text);
+ $result .= ">$link_text</a>";
+
+ return $this->hashPart($result);
+ }
+
+
+ function doImages($text) {
+ #
+ # Turn Markdown image shortcuts into <img> tags.
+ #
+ #
+ # First, handle reference-style labeled images: ![alt text][id]
+ #
+ $text = preg_replace_callback('{
+ ( # wrap whole match in $1
+ !\[
+ ('.$this->nested_brackets.') # alt text = $2
+ \]
+
+ [ ]? # 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
+ !\[
+ ('.$this->nested_brackets.') # alt text = $2
+ \]
+ \s? # One optional whitespace character
+ \( # literal paren
+ [ ]*
+ (?:
+ <(\S*)> # src url = $3
+ |
+ ('.$this->nested_url_parenthesis.') # src url = $4
+ )
+ [ ]*
+ ( # $5
+ ([\'"]) # quote char = $6
+ (.*?) # title = $7
+ \6 # matching quote
+ [ ]*
+ )? # title is optional
+ \)
+ )
+ }xs',
+ array(&$this, '_doImages_inline_callback'), $text);
+
+ return $text;
+ }
+ function _doImages_reference_callback($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 = str_replace('"', '&quot;', $alt_text);
+ if (isset($this->urls[$link_id])) {
+ $url = $this->urls[$link_id];
+ $result = "<img src=\"$url\" alt=\"$alt_text\"";
+ if (isset($this->titles[$link_id])) {
+ $title = $this->titles[$link_id];
+ $result .= " title=\"$title\"";
+ }
+ $result .= $this->empty_element_suffix;
+ $result = $this->hashPart($result);
+ }
+ else {
+ # If there's no such link ID, leave intact:
+ $result = $whole_match;
+ }
+
+ return $result;
+ }
+ function _doImages_inline_callback($matches) {
+ $whole_match = $matches[1];
+ $alt_text = $matches[2];
+ $url = $matches[3] == '' ? $matches[4] : $matches[3];
+ $title =& $matches[7];
+
+ $alt_text = str_replace('"', '&quot;', $alt_text);
+ $result = "<img src=\"$url\" alt=\"$alt_text\"";
+ if (isset($title)) {
+ $title = str_replace('"', '&quot;', $title);
+ $result .= " title=\"$title\""; # $title already quoted
+ }
+ $result .= $this->empty_element_suffix;
+
+ return $this->hashPart($result);
+ }
+
+
+ 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 $text;
+ }
+ function _doHeaders_callback_setext($matches) {
+ $level = $matches[2]{0} == '=' ? 1 : 2;
+ $block = "<h$level>".$this->runSpanGamut($matches[1])."</h$level>";
+ return "\n" . $this->hashBlock($block) . "\n\n";
+ }
+ function _doHeaders_callback_atx($matches) {
+ $level = strlen($matches[1]);
+ $block = "<h$level>".$this->runSpanGamut($matches[2])."</h$level>";
+ return "\n" . $this->hashBlock($block) . "\n\n";
+ }
+
+
+ function doLists($text) {
+ #
+ # Form HTML ordered (numbered) and unordered (bulleted) lists.
+ #
+ $less_than_tab = $this->tab_width - 1;
+
+ # Re-usable patterns to match list item bullets and number markers:
+ $marker_ul = '[*+-]';
+ $marker_ol = '\d+[.]';
+ $marker_any = "(?:$marker_ul|$marker_ol)";
+
+ $markers = array($marker_ul, $marker_ol);
+
+ foreach ($markers as $marker) {
+ # Re-usable pattern to match any entirel ul or ol list:
+ $whole_list = '
+ ( # $1 = whole list
+ ( # $2
+ [ ]{0,'.$less_than_tab.'}
+ ('.$marker.') # $3 = first list item marker
+ [ ]+
+ )
+ (?s:.+?)
+ ( # $4
+ \z
+ |
+ \n{2,}
+ (?=\S)
+ (?! # Negative lookahead for another list item marker
+ [ ]*
+ '.$marker.'[ ]+
+ )
+ )
+ )
+ '; // 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.'
+ }mx',
+ array(&$this, '_doLists_callback'), $text);
+ }
+ else {
+ $text = preg_replace_callback('{
+ (?:(?<=\n)\n|\A\n?) # Must eat the newline
+ '.$whole_list.'
+ }mx',
+ array(&$this, '_doLists_callback'), $text);
+ }
+ }
+
+ return $text;
+ }
+ function _doLists_callback($matches) {
+ # Re-usable patterns to match list item bullets and number markers:
+ $marker_ul = '[*+-]';
+ $marker_ol = '\d+[.]';
+ $marker_any = "(?:$marker_ul|$marker_ol)";
+
+ $list = $matches[1];
+ $list_type = preg_match("/$marker_ul/", $matches[3]) ? "ul" : "ol";
+
+ $marker_any = ( $list_type == "ul" ? $marker_ul : $marker_ol );
+
+ $list .= "\n";
+ $result = $this->processListItems($list, $marker_any);
+
+ $result = $this->hashBlock("<$list_type>\n" . $result . "</$list_type>");
+ return "\n". $result ."\n\n";
+ }
+
+ var $list_level = 0;
+
+ function processListItems($list_str, $marker_any) {
+ #
+ # Process the contents of a single ordered or unordered list, splitting it
+ # into individual list items.
+ #
+ # The $this->list_level global keeps track of when we're inside a list.
+ # Each time we enter a list, we increment it; when we leave a list,
+ # we decrement. If it's zero, we're not in a list anymore.
+ #
+ # We do this because when we're not inside a list, we want to treat
+ # something like this:
+ #
+ # I recommend upgrading to version
+ # 8. Oops, now this line is treated
+ # as a sub-list.
+ #
+ # As a single paragraph, despite the fact that the second line starts
+ # with a digit-period-space sequence.
+ #
+ # Whereas when we're inside a list (or sub-list), that line will be
+ # treated as the start of a sub-list. What a kludge, huh? This is
+ # an aspect of Markdown's syntax that's hard to parse perfectly
+ # without resorting to mind-reading. Perhaps the solution is to
+ # change the syntax rules such that sub-lists must start with a
+ # starting cardinal number; e.g. "1." or "a.".
+
+ $this->list_level++;
+
+ # trim trailing blank lines:
+ $list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);
+
+ $list_str = preg_replace_callback('{
+ (\n)? # leading line = $1
+ (^[ ]*) # leading whitespace = $2
+ ('.$marker_any.') [ ]+ # list marker = $3
+ ((?s:.+?)) # list item text = $4
+ (?:(\n+(?=\n))|\n) # tailing blank line = $5
+ (?= \n* (\z | \2 ('.$marker_any.') [ ]+))
+ }xm',
+ array(&$this, '_processListItems_callback'), $list_str);
+
+ $this->list_level--;
+ return $list_str;
+ }
+ function _processListItems_callback($matches) {
+ $item = $matches[4];
+ $leading_line =& $matches[1];
+ $leading_space =& $matches[2];
+ $tailing_blank_line =& $matches[5];
+
+ if ($leading_line || $tailing_blank_line ||
+ preg_match('/\n{2,}/', $item))
+ {
+ $item = $this->runBlockGamut($this->outdent($item)."\n");
+ }
+ else {
+ # Recursion for sub-lists:
+ $item = $this->doLists($this->outdent($item));
+ $item = preg_replace('/\n+$/', '', $item);
+ $item = $this->runSpanGamut($item);
+ }
+
+ return "<li>" . $item . "</li>\n";
+ }
+
+
+ function doCodeBlocks($text) {
+ #
+ # Process Markdown `<pre><code>` blocks.
+ #
+ $text = preg_replace_callback('{
+ (?:\n\n|\A)
+ ( # $1 = the code block -- one or more lines, starting with a space/tab
+ (?>
+ [ ]{'.$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 $text;
+ }
+ function _doCodeBlocks_callback($matches) {
+ $codeblock = $matches[1];
+
+ $codeblock = $this->outdent($codeblock);
+ $codeblock = htmlspecialchars($codeblock, ENT_NOQUOTES);
+
+ # trim leading newlines and trailing newlines
+ $codeblock = preg_replace('/\A\n+|\n+\z/', '', $codeblock);
+
+ $codeblock = "<pre><code>$codeblock\n</code></pre>";
+ return "\n\n".$this->hashBlock($codeblock)."\n\n";
+ }
+
+
+ function makeCodeSpan($code) {
+ #
+ # Create a code span markup for $code. Called from handleSpanToken.
+ #
+ $code = htmlspecialchars(trim($code), ENT_NOQUOTES);
+ return $this->hashPart("<code>$code</code>");
+ }
+
+
+ function doItalicsAndBold($text) {
+ # <strong> must go first:
+ $text = preg_replace_callback('{
+ ( # $1: Marker
+ (?<!\*\*) \* | # (not preceded by two chars of
+ (?<!__) _ # the same marker)
+ )
+ \1
+ (?=\S) # Not followed by whitespace
+ (?!\1\1) # or two others marker chars.
+ ( # $2: Content
+ (?>
+ [^*_]+? # Anthing not em markers.
+ |
+ # Balence any regular emphasis inside.
+ \1 (?=\S) .+? (?<=\S) \1
+ |
+ . # Allow unbalenced * and _.
+ )+?
+ )
+ (?<=\S) \1\1 # End mark not preceded by whitespace.
+ }sx',
+ array(&$this, '_doItalicAndBold_strong_callback'), $text);
+ # Then <em>:
+ $text = preg_replace_callback(
+ '{ ( (?<!\*)\* | (?<!_)_ ) (?=\S) (?! \1) (.+?) (?<=\S)(?<!\s(?=\1).) \1 }sx',
+ array(&$this, '_doItalicAndBold_em_callback'), $text);
+
+ return $text;
+ }
+ function _doItalicAndBold_em_callback($matches) {
+ $text = $matches[2];
+ $text = $this->runSpanGamut($text);
+ return $this->hashPart("<em>$text</em>");
+ }
+ function _doItalicAndBold_strong_callback($matches) {
+ $text = $matches[2];
+ $text = $this->runSpanGamut($text);
+ return $this->hashPart("<strong>$text</strong>");
+ }
+
+
+ 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 $text;
+ }
+ function _doBlockQuotes_callback($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 <pre> content,
+ # so we need to fix that:
+ $bq = preg_replace_callback('{(\s*<pre>.+?</pre>)}sx',
+ array(&$this, '_DoBlockQuotes_callback2'), $bq);
+
+ return "\n". $this->hashBlock("<blockquote>\n$bq\n</blockquote>")."\n\n";
+ }
+ function _doBlockQuotes_callback2($matches) {
+ $pre = $matches[1];
+ $pre = preg_replace('/^ /m', '', $pre);
+ return $pre;
+ }
+
+
+ function formParagraphs($text) {
+ #
+ # Params:
+ # $text - string to process with html <p> tags
+ #
+ # Strip leading and trailing lines:
+ $text = preg_replace('/\A\n+|\n+\z/', '', $text);
+
+ $grafs = preg_split('/\n{2,}/', $text, -1, PREG_SPLIT_NO_EMPTY);
+
+ #
+ # Wrap <p> tags and unhashify HTML blocks
+ #
+ foreach ($grafs as $key => $value) {
+ if (!preg_match('/^B\x1A[0-9]+B$/', $value)) {
+ # Is a paragraph.
+ $value = $this->runSpanGamut($value);
+ $value = preg_replace('/^([ ]*)/', "<p>", $value);
+ $value .= "</p>";
+ $grafs[$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 = <div> tag
+// <div \s+
+// [^>]*
+// \b
+// markdown\s*=\s* ([\'"]) # $2 = attr quote char
+// 1
+// \2
+// [^>]*
+// >
+// )
+// ( # $3 = contents
+// .*
+// )
+// (</div>) # $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", $grafs);
+ }
+
+
+ function encodeAmpsAndAngles($text) {
+ # Smart processing for ampersands and angle brackets that need to be encoded.
+ if ($this->no_entities) {
+ $text = str_replace('&', '&amp;', $text);
+ $text = str_replace('<', '&lt;', $text);
+ return $text;
+ }
+
+ # Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
+ # http://bumppo.net/projects/amputator/
+ $text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/',
+ '&amp;', $text);;
+
+ # Encode naked <'s
+ $text = preg_replace('{<(?![a-z/?\$!%])}i', '&lt;', $text);
+
+ return $text;
+ }
+
+
+ function doAutoLinks($text) {
+ $text = preg_replace_callback('{<((https?|ftp|dict):[^\'">\s]+)>}',
+ array(&$this, '_doAutoLinks_url_callback'), $text);
+
+ # Email addresses: <address@domain.foo>
+ $text = preg_replace_callback('{
+ <
+ (?:mailto:)?
+ (
+ [-.\w\x80-\xFF]+
+ \@
+ [-a-z0-9\x80-\xFF]+(\.[-a-z0-9\x80-\xFF]+)*\.[a-z]+
+ )
+ >
+ }xi',
+ array(&$this, '_doAutoLinks_email_callback'), $text);
+
+ return $text;
+ }
+ function _doAutoLinks_url_callback($matches) {
+ $url = $this->encodeAmpsAndAngles($matches[1]);
+ $link = "<a href=\"$url\">$url</a>";
+ return $this->hashPart($link);
+ }
+ function _doAutoLinks_email_callback($matches) {
+ $address = $matches[1];
+ $link = $this->encodeEmailAddress($address);
+ return $this->hashPart($link);
+ }
+
+
+ function encodeEmailAddress($addr) {
+ #
+ # Input: an email address, e.g. "foo@example.com"
+ #
+ # Output: the email address as a mailto link, with each character
+ # of the address encoded as either a decimal or hex entity, in
+ # the hopes of foiling most address harvesting spam bots. E.g.:
+ #
+ # <p><a href="&#109;&#x61;&#105;&#x6c;&#116;&#x6f;&#58;&#x66;o&#111;
+ # &#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;&#101;&#46;&#x63;&#111;
+ # &#x6d;">&#x66;o&#111;&#x40;&#101;&#x78;&#97;&#x6d;&#112;&#x6c;
+ # &#101;&#46;&#x63;&#111;&#x6d;</a></p>
+ #
+ # Based by a filter by Matthew Wickline, posted to BBEdit-Talk.
+ # With some optimizations by Milian Wolff.
+ #
+ $addr = "mailto:" . $addr;
+ $chars = preg_split('/(?<!^)(?!$)/', $addr);
+ $seed = (int)abs(crc32($addr) / strlen($addr)); # Deterministic seed.
+
+ foreach ($chars as $key => $char) {
+ $ord = ord($char);
+ # Ignore non-ascii chars.
+ if ($ord < 128) {
+ $r = ($seed * (1 + $key)) % 100; # Pseudo-random function.
+ # roughly 10% raw, 45% hex, 45% dec
+ # '@' *must* be encoded. I insist.
+ if ($r > 90 && $char != '@') /* do nothing */;
+ else if ($r < 45) $chars[$key] = '&#x'.dechex($ord).';';
+ else $chars[$key] = '&#'.$ord.';';
+ }
+ }
+
+ $addr = implode('', $chars);
+ $text = implode('', array_slice($chars, 7)); # text without `mailto:`
+ $addr = "<a href=\"$addr\">$text</a>";
+
+ return $addr;
+ }
+
+
+ function parseSpan($str) {
+ #
+ # Take the string $str and parse it into tokens, hashing embeded HTML,
+ # escaped characters and handling code spans.
+ #
+ $output = '';
+
+ $regex = '{
+ (
+ \\\\['.preg_quote($this->escape_chars).']
+ |
+ (?<![`\\\\])
+ `+ # code span marker
+ '.( $this->no_markup ? '' : '
+ |
+ <!-- .*? --> # comment
+ |
+ <\?.*?\?> | <%.*?%> # processing instruction
+ |
+ <[/!$]?[-a-zA-Z0-9:]+ # regular tags
+ (?>
+ \s
+ (?>[^"\'>]+|"[^"]*"|\'[^\']*\')*
+ )?
+ >
+ ').'
+ )
+ }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.
+ #
+ $parts = preg_split($regex, $str, 2, PREG_SPLIT_DELIM_CAPTURE);
+
+ # Create token from text preceding tag.
+ if ($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 $output;
+ }
+
+
+ function handleSpanToken($token, &$str) {
+ #
+ # Handle $token provided by parseSpan by determining its nature and
+ # returning the corresponding value that should replace it.
+ #
+ switch ($token{0}) {
+ case "\\":
+ return $this->hashPart("&#". ord($token{1}). ";");
+ case "`":
+ # Search for end marker in remaining text.
+ if (preg_match('/^(.*?[^`])'.$token.'(?!`)(.*)$/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);
+ }
+ }
+
+
+ function outdent($text) {
+ #
+ # Remove one level of line-leading tabs or spaces
+ #
+ return preg_replace('/^(\t|[ ]{1,'.$this->tab_width.'})/m', '', $text);
+ }
+
+
+ # String length function for detab. `_initDetab` will create a function to
+ # hanlde UTF-8 if the default function does not exist.
+ var $utf8_strlen = 'mb_strlen';
+
+ function detab($text) {
+ #
+ # Replace tabs with the appropriate amount of space.
+ #
+ # For each line we separate the line in blocks delemited by
+ # tab characters. Then we reconstruct every line by adding the
+ # appropriate number of space between each blocks.
+
+ $text = preg_replace_callback('/^.*\t.*$/m',
+ array(&$this, '_detab_callback'), $text);
+
+ return $text;
+ }
+ function _detab_callback($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 $line;
+ }
+ function _initDetab() {
+ #
+ # Check for the availability of the function in the `utf8_strlen` property
+ # (initially `mb_strlen`). If the function is not available, create a
+ # function that will loosely count the number of UTF-8 characters with a
+ # regular expression.
+ #
+ if (function_exists($this->utf8_strlen)) return;
+ $this->utf8_strlen = create_function('$text', 'return preg_match_all(
+ "/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
+ $text, $m);');
+ }
+
+
+ function unhash($text) {
+ #
+ # Swap back in all the tags hashed by _HashHTMLBlocks.
+ #
+ return preg_replace_callback('/(.)\x1A[0-9]+\1/',
+ array(&$this, '_unhash_callback'), $text);
+ }
+ function _unhash_callback($matches) {
+ return $this->html_hashes[$matches[0]];
+ }
+
+}
+
+/*
+
+PHP Markdown
+============
+
+Description
+-----------
+
+This is a PHP translation of the original Markdown formatter written in
+Perl by John Gruber.
+
+Markdown is a text-to-HTML filter; it translates an easy-to-read /
+easy-to-write structured text format into HTML. Markdown's text format
+is most similar to that of plain text email, and supports features such
+as headers, *emphasis*, code blocks, blockquotes, and links.
+
+Markdown's syntax is designed not as a generic markup language, but
+specifically to serve as a front-end to (X)HTML. You can use span-level
+HTML tags anywhere in a Markdown document, and you can use block level
+HTML tags (like <div> and <table> as well).
+
+For more information about Markdown's syntax, see:
+
+<http://daringfireball.net/projects/markdown/>
+
+
+Bugs
+----
+
+To file bug reports please send email to:
+
+<michel.fortin@michelf.com>
+
+Please include with your report: (1) the example input; (2) the output you
+expected; (3) the output Markdown actually produced.
+
+
+Version History
+---------------
+
+See the readme file for detailed release notes for this version.
+
+
+Copyright and License
+---------------------
+
+PHP Markdown
+Copyright (c) 2004-2007 Michel Fortin
+<http://www.michelf.com/>
+All rights reserved.
+
+Based on Markdown
+Copyright (c) 2003-2006 John Gruber
+<http://daringfireball.net/>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+* Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in the
+ documentation and/or other materials provided with the distribution.
+
+* Neither the name "Markdown" nor the names of its contributors may
+ be used to endorse or promote products derived from this software
+ without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as
+is" and any express or implied warranties, including, but not limited
+to, the implied warranties of merchantability and fitness for a
+particular purpose are disclaimed. In no event shall the copyright owner
+or contributors be liable for any direct, indirect, incidental, special,
+exemplary, or consequential damages (including, but not limited to,
+procurement of substitute goods or services; loss of use, data, or
+profits; or business interruption) however caused and on any theory of
+liability, whether in contract, strict liability, or tort (including
+negligence or otherwise) arising in any way out of the use of this
+software, even if advised of the possibility of such damage.
+
+*/
+?>
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