<?php

/**

* 

* Parses for heading text.

* 

* @category Text

* 

* @package Text_Wiki

* 

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

* 

* @author Moritz Venn <moritz.venn@freaque.net>

* 

* @license LGPL

* 

* @version $Id: Heading.php,v 1.3 2006/02/03 19:47:02 toggg Exp $

* 

*/

/**

* 

* Parses for heading text.

* 

* This class implements a Text_Wiki_Parse to find source text marked to

* be a heading element, as defined by text on a line by itself prefixed

* with a number of plus signs (+). The heading text itself is left in

* the source, but is prefixed and suffixed with delimited tokens marking

* the start and end of the heading.

*

* @category Text

* 

* @package Text_Wiki

* 

* @author Moritz Venn <moritz.venn@freaque.net>

* 

*/

class Text_Wiki_Parse_Heading 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 $regex = '/^(={2,6})(.*?)\1(?:[\t ]|$)/m';

    var $conf = array(

        'id_prefix' => 'toc'

    );

    /**

    * 

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

    * 

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

    * heading 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 heading text.

    *

    */

    function process(&$matches)

    {

        // keep a running count for header IDs.  we use this later

        // when constructing TOC entries, etc.

        static $id;

        if (! isset($id)) {

            $id = 0;

        }

        $prefix = htmlspecialchars($this->getConf('id_prefix'));

        $start = $this->wiki->addToken(

            $this->rule, 

            array(

                'type' => 'start',

                'level' => strlen($matches[1]),

                'text' => trim($matches[2]),

                'id' => $prefix . $id ++

            )

        );

        $end = $this->wiki->addToken(

            $this->rule, 

            array(

                'type' => 'end',

                'level' => strlen($matches[1])

            )

        );

        return $start . trim($matches[2]) . $end . "\n";

    }

}

?>