<?php

/**

* 

* Parses for text marked as revised (insert/delete).

* 

* @category Text

* 

* @package Text_Wiki

* 

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

* 

* @license LGPL

* 

* @version $Id: Revise.php,v 1.3 2005/02/23 17:38:29 pmjones Exp $

* 

*/

/**

* 

* Parses for text marked as revised (insert/delete).

*

* @category Text

* 

* @package Text_Wiki

* 

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

* 

*/

class Text_Wiki_Parse_Revise 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";

    /**

    * 

    * Config options.

    * 

    * @access public

    * 

    * @var array

    *

    */

    var $conf = array(

        'delmark' => '---',

        'insmark' => '+++'

    );

    /**

    * 

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

    * 

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

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

    * 

    * @access public

    *

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

    *

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

    * placeholder in the source text surrounding the teletype text.

    *

    */

    function process(&$matches)

    {

        $output = '';

        $src = $matches[1];

        $delmark = $this->getConf('delmark'); // ---

        $insmark = $this->getConf('insmark'); // +++

        // '---' must be before '+++' (if they both appear)

        $del = strpos($src, $delmark);

        $ins = strpos($src, $insmark);

        // if neither is found, return right away

        if ($del === false && $ins === false) {

            return $matches[0];

        }

        // handle text to be deleted

        if ($del !== false) {

            // move forward to the end of the deletion mark

            $del += strlen($delmark);

            if ($ins === false) {

                // there is no insertion text following

                $text = substr($src, $del);

            } else {

                // there is insertion text following,

                // mitigate the length

                $text = substr($src, $del, $ins - $del);

            }

            $output .= $this->wiki->addToken(

                $this->rule, array('type' => 'del_start')

            );

            $output .= $text;

            $output .= $this->wiki->addToken(

                $this->rule, array('type' => 'del_end')

            );

        }

        // handle text to be inserted

        if ($ins !== false) {

            // move forward to the end of the insert mark

            $ins += strlen($insmark);

            $text = substr($src, $ins);

            $output .= $this->wiki->addToken(

                $this->rule, array('type' => 'ins_start')

            );

            $output .= $text;

            $output .= $this->wiki->addToken(

                $this->rule, array('type' => 'ins_end')

            );

        }

        return $output;

    }

}

?>