markdown.php

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	$result;
	$whole_match = $matches[1];
	$alt_text    = $matches[2];
	$url	  		= $matches[3];
	$title		= $matches[4];

	$url = str_replace(array('*',     '_'),
					   array('*', '_'), $url);
	$result = "<img src=\"$url\" alt=\"$alt_text\"";
	if (isset($title)) {
		$title = str_replace(array('*',     '_'),
							 array('&#42;', '&#95;'), $title);
		$result .=  " title=$title"; # $title already quoted
	}
	$result .= $g_empty_element_suffix;

	return $result;
}


function _DoHeaders($text) {
	$text = preg_replace(
		array("/(.+)[ \t]*\n=+[ \t]*\n+/e",
			  "/(.+)[ \t]*\n-+[ \t]*\n+/e"),
		array("'<h1>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h1>\n\n'",
			  "'<h2>'._RunSpanGamut(_UnslashQuotes('\\1')).'</h2>\n\n'"),
		$text);

	$text = preg_replace("{
			^(\\#{1,6})	# $1 = string of #'s
			[ \\t]*
			(.+?)		# $2 = Header text
			[ \\t]*
			\\#*			# optional closing #'s (not counted)
			\\n+
		}xme",
		"'<h'.strlen('\\1').'>'._RunSpanGamut(_UnslashQuotes('\\2')).'</h'.strlen('\\1').'>\n\n'",
		$text);

	return $text;
}


function _DoLists($text) {
	global $g_tab_width;
	$less_than_tab = $g_tab_width - 1;

	$text = preg_replace_callback("{
			(
			  (
			    ^[ ]{0,$less_than_tab}
			    (\\*|\\d+[.])
			    [ \\t]+
			  )
			  (?s:.+?)
			  (
			      \\z
			    |
				  \\n{2,}
				  (?=\\S)
				  (?![ \\t]* (\\*|\\d+[.]) [ \\t]+)
			  )
			)
		}xm",
		'_DoLists_callback', $text);

	return $text;
}
function _DoLists_callback($matches) {
	$list_type = ($matches[3] == "*") ? "ul" : "ol";
	$list = $matches[1];
	$list = preg_replace("/\n{2,}/", "\n\n\n", $list);
	$result = _ProcessListItems($list);
	$result = "<$list_type>\n" . $result . "</$list_type>\n";
	return $result;
}


function _ProcessListItems($list_str) {
	# trim trailing blank lines:
	$list_str = preg_replace("/\n{2,}\\z/", "\n", $list_str);

	$list_str = preg_replace_callback('{
		(\n)?							# leading line = $1
		(^[ \t]*)						# leading whitespace = $2
		(\*|\d+[.]) [ \t]+				# list marker = $3
		((?s:.+?)						# list item text   = $4
		(\n{1,2}))
		(?= \n* (\z | \2 (\*|\d+[.]) [ \t]+))
		}xm',
		'_ProcessListItems_callback', $list_str);

	return $list_str;
}
function _ProcessListItems_callback($matches) {
	$item = $matches[4];
	$leading_line = $matches[1];
	$leading_space = $matches[2];

	if ($leading_line || preg_match('/\n{2,}/', $item)) {
		$item = _RunBlockGamut(_Outdent($item));
		#$item =~ s/\n+/\n/g;
	}
	else {
		# Recursion for sub-lists:
		$item = _DoLists(_Outdent($item));
		$item = rtrim($item, "\n");
		$item = _RunSpanGamut($item);
	}

	return "<li>" . $item . "</li>\n";
}


function _DoCodeBlocks($text) {
	global $g_tab_width;
	$text = preg_replace_callback("{
			(.?)			# $1 = preceding character
			(:)				# $2 = colon delimiter
			(\\n+)			# $3 = newlines after colon
			(	            # $4 = the code block -- one or more lines, starting with a space/tab
			  (?:
			    (?:[ ]\{$g_tab_width} | \\t)  # Lines must start with a tab or a tab-width of spaces
			    .*\\n+
			  )+
			)
			((?=^[ ]{0,$g_tab_width}\\S)|\\Z)	# Lookahead for non-space at line-start, or end of doc
		}xm",
		'_DoCodeBlocks_callback', $text);

	return $text;
}
function _DoCodeBlocks_callback($matches) {
	$prevchar  = $matches[1];
	$newlines  = $matches[2];
	$codeblock = $matches[4];

	$result; # return value
	

	$prefix = "";
	if (!(preg_match('/\s/', $prevchar) || ($prevchar == ""))) {
			$prefix = "$prevchar:";
	}
	$codeblock = _EncodeCode(_Outdent($codeblock));
	$codeblock = _Detab($codeblock);
	# trim leading newlines and trailing whitespace
	$codeblock = preg_replace(array('/\A\n+/', '/\s+\z/'), '', $codeblock);
	
	$result = $prefix . "\n\n<pre><code>" . $codeblock . "\n</code></pre>\n\n";

	return $result;
}


function _DoCodeSpans($text) {
	$text = preg_replace_callback("@
			(`+)		# Opening run of `
			(.+?)		# the code block
			(?<!`)
			\\1
			(?!`)
		@xs",
		'_DoCodeSpans_callback', $text);

	return $text;
}
function _DoCodeSpans_callback($matches) {
	$c = $matches[2];
	$c = preg_replace('/^[ \t]*/', '', $c); # leading whitespace
	$c = preg_replace('/[ \t]*$/', '', $c); # trailing whitespace
	$c = _EncodeCode($c);
	return "<code>$c</code>";
}


function _EncodeCode($_) {

	global $g_escape_table;

	# Encode all ampersands; HTML entities are not
	# entities within a Markdown code span.
	$_ = str_replace('&', '&amp;', $_);

	# Do the angle bracket song and dance:
	$_ = str_replace(array('<',    '>'), 
					 array('&lt;', '&gt;'), $_);

	# Now, escape characters that are magic in Markdown:
	$_ = str_replace(array_keys($g_escape_table), 
					 array_values($g_escape_table), $_);

	return $_;
}


function _DoItalicsAndBold($text) {
	# <strong> must go first:
	$text = preg_replace('{ (\*\*|__) (?=\S) (.+?) (?<=\S) \1 }sx',
		'<strong>\2</strong>', $text);
	# Then <em>:
	$text = preg_replace('{ (\*|_) (?=\S) (.+?) (?<=\S) \1 }sx',
		'<em>\2</em>', $text);

	return $text;
}


function _DoBlockQuotes($text) {
	$text = preg_replace_callback('/
		  (								# Wrap whole match in $1
			(
			  ^[ \t]*>[ \t]?			# ">" at the start of a line
				.+\n					# rest of the first line
			  (.+\n)*					# subsequent consecutive lines
			  \n*						# blanks
			)+
		  )
		/xm',
		'_DoBlockQuotes_callback', $text);

	return $text;
}
function _DoBlockQuotes_callback($matches) {
	$bq = $matches[1];
	$bq = preg_replace('/^[ \t]*>[ \t]?/m', '', $bq); 
	$bq = _RunBlockGamut($bq);		# recurse
	$bq = preg_replace('/^/m', "\t", $bq);
	
	return "<blockquote>\n$bq\n</blockquote>\n\n";
}


function _FormParagraphs($text) {
	global $g_html_blocks;

	# Strip leading and trailing lines:
	$text = preg_replace(array('/\A\n+/', '/\n+\z/'), '', $text);

	$grafs = preg_split('/\n{2,}/', $text);
	$count = count($graph);


	foreach ($grafs as $key => $value) {
		if (!isset( $g_html_blocks[$value] )) {
			$value = _RunSpanGamut($value);
			$value = preg_replace('/^([ \t]*)/', '<p>', $value);
			$value .= "</p>";
			$grafs[$key] = $value;
		}
	}


	foreach ($grafs as $key => $value) {
		if (isset( $g_html_blocks[$value] )) {
			$grafs[$key] = $g_html_blocks[$value];
		}
	}

	return implode("\n\n", $grafs);
}


function _EncodeAmpsAndAngles($text) {
	$text = preg_replace('/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w{1,8});)/', 
						 '&amp;', $text);;

	# Encode naked <'s
	$text = preg_replace('{<(?![a-z/?\$!])}i', '&lt;', $text);

	return $text;
}


function _EncodeBackslashEscapes($text) {
	global $g_escape_table, $g_backslash_escape_table;
	# Must process escaped backslashes first.
	return str_replace(array_keys($g_backslash_escape_table),
					   array_values($g_backslash_escape_table), $text);
}


function _DoAutoLinks($text) {
	$text = preg_replace("!<((https?|ftp):[^'\">\\s]+)>!", 
						 '<a href="\1">\1</a>', $text);
	
	# Email addresses: <[e-mail]>
	$text = preg_replace('{
		<
		(
			[-.\w]+
			\@
			[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
		)
		>
		}exi',
		"_EncodeEmailAddress(_UnescapeSpecialChars(_UnslashQuotes('\\1')))",
		$text);
	
	return $text;
}


function _EncodeEmailAddress($addr) {
	$addr = "mailto:" . $addr;
	$length = strlen($addr);

	$addr = preg_replace_callback('/([^\:])/', 
								  '_EncodeEmailAddress_callback', $addr);

	$addr = "<a href=\"$addr\">$addr</a>";
	$addr = preg_replace('/">.+?:/', '">', $addr);

	return $addr;
}
function _EncodeEmailAddress_callback($matches) {
	$char = $matches[1];
	$r = rand(0, 100);
	if ($r > 90 && $char != '@') return $char;
	if ($r < 45) return '&#x'.dechex(ord($char)).';';
	return '&#'.ord($char).';';
}


function _UnescapeSpecialChars($text) {
	global $g_escape_table;
	return str_replace(array_values($g_escape_table), 
					   array_keys($g_escape_table), $text);
}


function _TokenizeHTML($str) {
	$pos = 0;
	$len = strlen($str);
	$tokens = array();

	$depth = 6;
	$nested_tags = str_repeat('(?:<[a-z\/!$](?:[^<>]|',$depth)
				   .str_repeat(')*>)', $depth);
	$match = "(?s:<!(--.*?--\s*)+>)|".  # comment
			 "(?s:<\?.*?\?>)|".         # processing instruction
			 "$nested_tags";            # nested tags
	
	preg_match_all("/($match)/", $str, $matches, 
				   PREG_SET_ORDER | PREG_OFFSET_CAPTURE);

	foreach ($matches as $element) {
		$whole_tag = $element[0][0];
		$tag_start = $element[0][1];
		$sec_start = $tag_start + strlen($whole_tag);
		if ($pos < $tag_start) {
			array_push($tokens, array('text', 
					   substr($str, $pos, $tag_start - $pos)));
		}
		array_push($tokens, array('tag', $whole_tag));
		$pos = $sec_start;
	}
	
	if ($pos < $len)
		array_push($tokens, array('text', 
				   substr($str, $pos, $len - $pos)));
	return $tokens;
}


function _Outdent($text) {
	global $g_tab_width;
	return preg_replace("/^(\\t|[ ]{1,$g_tab_width})/m", "", $text);
}


function _Detab($text) {
	global $g_tab_width;
	$text = preg_replace(
		"/(.*?)\t/e",
		"'\\1'.str_repeat(' ', $g_tab_width - strlen('\\1') % $g_tab_width)",
		$text);
	return $text;
}


function _UnslashQuotes($text) {
	return str_replace('\"', '"', $text);
}

// And now for the filters
remove_filter('the_content', 'wpautop');
remove_filter('the_excerpt', 'wpautop');
remove_filter('comment_text', 'wpautop');

add_filter('the_content', 'Markdown');
add_filter('the_excerpt', 'Markdown');
remove_filter('comment_text', 'Markdown');

?>