<?php

/**
 * Injector that converts http, https and ftp text URLs to actual links.
 */
class HTMLPurifier_Injector_Linkify extends HTMLPurifier_Injector {
	/**
	 * @type string
	 */
	public $name = 'Linkify';
	
	/**
	 * @type array
	 */
	public $needed = array (
			'a' => array (
					'href' 
			) 
	);
	
	/**
	 *
	 * @param HTMLPurifier_Token $token        	
	 */
	public function handleText(&$token) {
		if (! $this->allowsElement ( 'a' )) {
			return;
		}
		
		if (strpos ( $token->data, '://' ) === false) {
			// our really quick heuristic failed, abort
			// this may not work so well if we want to match things like
			// "google.com", but then again, most people don't
			return;
		}
		
		// there is/are URL(s). Let's split the string:
		// Note: this regex is extremely permissive
		$bits = preg_split ( '#((?:https?|ftp)://[^\s\'",<>()]+)#Su', $token->data, - 1, PREG_SPLIT_DELIM_CAPTURE );
		
		$token = array ();
		
		// $i = index
		// $c = count
		// $l = is link
		for($i = 0, $c = count ( $bits ), $l = false; $i < $c; $i ++, $l = ! $l) {
			if (! $l) {
				if ($bits [$i] === '') {
					continue;
				}
				$token [] = new HTMLPurifier_Token_Text ( $bits [$i] );
			} else {
				$token [] = new HTMLPurifier_Token_Start ( 'a', array (
						'href' => $bits [$i] 
				) );
				$token [] = new HTMLPurifier_Token_Text ( $bits [$i] );
				$token [] = new HTMLPurifier_Token_End ( 'a' );
			}
		}
	}
}

// vim: et sw=4 sts=4