<?php

/**

* 

* Parses for bold text.

* 

* @category Text

* 

* @package Text_Wiki

* 

* @author Paul M. Jones <pmjones@php.net>

* 

* @license LGPL

* 

* @version $Id: Underline.php,v 1.1 2005/07/10 20:40:20 justinpatrin Exp $

* 

*/

/**

* 

* Parses for bold text.

* 

* This class implements a Text_Wiki_Rule to find source text marked for

* strong emphasis (bold) as defined by text surrounded by three

* single-quotes. On parsing, the text itself is left in place, but the

* starting and ending instances of three single-quotes are replaced with

* tokens.

*

* @category Text

* 

* @package Text_Wiki

* 

* @author Paul M. Jones <pmjones@php.net>

* 

*/

class Text_Wiki_Parse_Underline extends Text_Wiki_Parse {

    /**

    * 

    * The regular expression used to parse the source text and find

    * matches conforming to this rule.  Used by the parse() method.

    * 

    * @access public

    * 

    * @var string

    * 

    * @see parse()

    * 

    */

    var $regex =  "/__(()|[^_].*)__/U";

    /**

    * 

    * Generates a replacement for the matched text.  Token options are:

    * 

    * 'type' => ['start'|'end'] The starting or ending point of the

    * emphasized text.  The text itself is left in the source.

    * 

    * @access public

    *

    * @param array &$matches The array of matches from parse().

    *

    * @return A pair of delimited tokens to be used as a placeholder in

    * the source text surrounding the text to be emphasized.

    *

    */

    function process(&$matches)

    {

        $start = $this->wiki->addToken($this->rule, array('type' => 'start'));

        $end = $this->wiki->addToken($this->rule, array('type' => 'end'));

        return $start . $matches[1] . $end;

    }

}

?>