Pepperminty-Wiki/modules/parser-default.php

<?php
register_module([
	"name" => "Default Parser",
	"version" => "0.7",
	"author" => "Johnny Broadway & Starbeamrainbowlabs",
	"description" => "The default parser for Pepperminty Wiki. Based on Johnny Broadway's Slimdown (with more than a few modifications). This parser's features are documented in the help page.",
	"id" => "parser-default",
	"code" => function() {
		add_parser(function($markdown) {
			return Slimdown::render($markdown);
		});
	}
]);

////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////// Slimdown /////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////// %slimdown% //
////////////////////////////////////////////////////////////////////////////////////////////
/**
 * Slimdown - A very basic regex-based Markdown parser. Supports the
 * following elements (and can be extended via Slimdown::add_rule()):
 *
 * - Headers
 * - Links
 * - Bold
 * - Emphasis
 * - Deletions
 * - Quotes
 * - Inline code
 * - Blockquotes
 * - Ordered/unordered lists
 * - Horizontal rules
 *
 * Author: Johnny Broadway <johnny@johnnybroadway.com>
 * Website: https://gist.github.com/jbroadway/2836900
 * License: MIT
 */

/**
 * Modified by Starbeamrainbowlabs (starbeamrainbowlabs)
 * 
 	* Changed bold to use single asterisks
 	* Changed italics to use single underscores
 	* Added one to add the heading levels (no <h1> tags allowed)
 	* Added wiki style internal link parsing
 	* Added wiki style internal link parsing with display text
 	* Added image support
 */
class Slimdown {
	public static $rules = array (
		'/\r\n/' => "\n",											// new line normalisation
		'/(#+)(.*)/' => 'self::header',								// headers
		'/(\*)(.*?)\1/' => '<strong>\2</strong>',					// bold
		'/(_)(.*?)\1/' => '<em>\2</em>',							// emphasis
		
		// todo test these
		'/!\[(.*)\]\(([^\s]+)\s(\d+.+)\s(left|right)\)/' => '<img src="\2" alt="\1" style="max-width: \3; float: \4;" />',		// images with size
		'/!\[(.*)\]\(([^\s]+)\s(\d+.+)\)/' => '<img src="\2" alt="\1" style="max-width: \3;" />',		// images with size
		'/!\[(.*)\]\((.*)\)/' => '<img src="\2" alt="\1" />',		// basic images
		// todo end
		
		'/\[\[([a-zA-Z0-9\_\- ]+)\|([a-zA-Z0-9\_\- ]+)\]\]/' => '<a href=\'index.php?page=\1\'>\2</a>',	//internal links with display text
		'/\[\[([a-zA-Z0-9\_\- ]+)\]\]/' => '<a href=\'index.php?page=\1\'>\1</a>',	//internal links
		'/\[([^\[]+)\]\(([^\)]+)\)/' => '<a href=\'\2\' target=\'_blank\'>\1</a>',	// links
		'/\~\~(.*?)\~\~/' => '<del>\1</del>',						// del
		'/\:\"(.*?)\"\:/' => '<q>\1</q>',							// quote
		'/`(.*?)`/' => '<code>\1</code>',							// inline code
		'/\n\s*(\*|-)(.*)/' => 'self::ul_list',						// ul lists
		'/\n[0-9]+\.(.*)/' => 'self::ol_list',						// ol lists
		'/\n(&gt;|\>)(.*)/' => 'self::blockquote',					// blockquotes
		'/\n-{3,}/' => "\n<hr />",									// horizontal rule
		'/\n([^\n]+)\n\n/' => 'self::para',							// add paragraphs
		'/<\/ul>\s?<ul>/' => '',									// fix extra ul
		'/<\/ol>\s?<ol>/' => '',									// fix extra ol
		'/<\/blockquote><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<p>%s</p>\n", $trimmed);
	}
	private static function ul_list ($regs) {
		$item = $regs[2];
		return sprintf ("\n<ul>\n\t<li>%s</li>\n</ul>", trim($item));
	}
	private static function ol_list ($regs) {
		$item = $regs[1];
		return sprintf ("\n<ol>\n\t<li>%s</li>\n</ol>", trim($item));
	}
	private static function blockquote ($regs) {
		$item = $regs[2];
		return sprintf ("\n<blockquote>%s</blockquote>", trim($item));
	}
	private static function header ($regs) {
		list ($tmp, $chars, $header) = $regs;
		$level = strlen ($chars);
		return sprintf ('<h%d>%s</h%d>', $level + 1, trim($header), $level + 1);
	}
	
	/**
	 * Add a rule.
	 */
	public static function add_rule ($regex, $replacement) {
		self::$rules[$regex] = $replacement;
	}
	/**
	 * Render some Markdown into HTML.
	 */
	public static function render ($text) {
		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);
	}
}
////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////

?>