* Website: https://gist.github.com/jbroadway/2836900
* License: MIT
*/
class Slimdown {
public static $rules = array (
'/(#+)(.*)/' => 'self::header', // headers
'/\[([^\[]+)\]\(([^\)]+)\)/' => '\1', // links
'/(\*\*|__)(.*?)\1/' => '\2', // bold
'/(\*|_)(.*?)\1/' => '\2', // emphasis
'/\~\~(.*?)\~\~/' => '\1', // del
'/\:\"(.*?)\"\:/' => '\1
', // quote
'/`(.*?)`/' => '\1', // inline code
'/\n\*(.*)/' => 'self::ul_list', // ul lists
'/\n[0-9]+\.(.*)/' => 'self::ol_list', // ol lists
'/\n(>|\>)(.*)/' => 'self::blockquote ', // blockquotes
'/\n-{5,}/' => "\n
", // horizontal rule
'/\n([^\n]+)\n/' => 'self::para', // add paragraphs
'/<\/ul>\s?/' => '', // fix extra ul
'/<\/ol>\s?/' => '', // fix extra ol
'/<\/blockquote>/' => "\n" // fix extra blockquote
);
private static function para ($regs) {
$line = $regs[1];
$trimmed = trim ($line);
if (preg_match ('/^<\/?(ul|ol|li|h|p|bl)/', $trimmed)) {
return "\n" . $line . "\n";
}
return sprintf ("\n%s
\n", $trimmed);
}
private static function ul_list ($regs) {
$item = $regs[1];
return sprintf ("\n", trim ($item));
}
private static function ol_list ($regs) {
$item = $regs[1];
return sprintf ("\n\n\t- %s
\n
", trim ($item));
}
private static function blockquote ($regs) {
$item = $regs[2];
return sprintf ("\n%s
", trim ($item));
}
private static function header ($regs) {
list ($tmp, $chars, $header) = $regs;
$level = strlen ($chars);
return sprintf ('%s', $level, trim ($header), $level);
}
/**
* Add a rule.
*/
public static function add_rule ($regex, $replacement) {
self::$rules[$regex] = $replacement;
}
/**
* Render some Markdown into HTML.
*/
public static function render ($text) {
$text = "\n" . $text . "\n";
foreach (self::$rules as $regex => $replacement) {
if (is_callable ( $replacement)) {
$text = preg_replace_callback ($regex, $replacement, $text);
} else {
$text = preg_replace ($regex, $replacement, $text);
}
}
return trim ($text);
}
}
Slimdown::add_rule( '/===(.*?)===/', '\1
' );
Slimdown::add_rule( '/==(.*?)===/', '\1
' );
Slimdown::add_rule( '/=(.*?)=/', '\1
' );