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<?php
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// $Id: Heading.php,v 1.1 2005-01-20 19:43:20 jpm Exp $
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/**
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*
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* This class implements a Text_Wiki_Parse to find source text marked to
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* be a heading element, as defined by text on a line by itself prefixed
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* with a number of plus signs (+). The heading text itself is left in
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* the source, but is prefixed and suffixed with delimited tokens marking
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* the start and end of the heading.
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*
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* @author Paul M. Jones <pmjones@ciaweb.net>
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*
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* @package Text_Wiki
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*
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*/
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class Text_Wiki_Parse_Heading extends Text_Wiki_Parse {
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    /**
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    *
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    * The regular expression used to parse the source text and find
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    * matches conforming to this rule.  Used by the parse() method.
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    *
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    * @access public
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    *
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    * @var string
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    *
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    * @see parse()
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    *
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    */
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    var $regex = '/^(\+{1,6}) (.*)/m';
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    var $conf = array(
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        'id_prefix' => 'toc'
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    );
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    /**
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    *
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    * Generates a replacement for the matched text.  Token options are:
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    *
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    * 'type' => ['start'|'end'] The starting or ending point of the
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    * heading text.  The text itself is left in the source.
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    *
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    * @access public
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    *
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    * @param array &$matches The array of matches from parse().
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    *
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    * @return string A pair of delimited tokens to be used as a
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    * placeholder in the source text surrounding the heading text.
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    *
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    */
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    function process(&$matches)
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    {
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        // keep a running count for header IDs.  we use this later
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        // when constructing TOC entries, etc.
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        static $id;
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        if (! isset($id)) {
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            $id = 0;
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        }
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        $prefix = htmlspecialchars($this->getConf('id_prefix'));
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        $start = $this->wiki->addToken(
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            $this->rule,
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            array(
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                'type' => 'start',
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                'level' => strlen($matches[1]),
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                'text' => $matches[2],
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                'id' => $prefix . $id ++
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            )
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        );
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        $end = $this->wiki->addToken(
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            $this->rule,
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            array(
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                'type' => 'end',
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                'level' => strlen($matches[1])
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            )
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        );
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        return $start . $matches[2] . $end . "\n";
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    }
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}
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?>