includes/wikiengine/Parse/Default/Url.php
author Dan
Wed, 28 Nov 2007 14:47:42 -0500
changeset 299 ce2873735506
parent 1 fe660c52c48f
permissions -rw-r--r--
Oops, never merged in updates from ee1fc84f12a8 (240)
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<?php
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/**
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* 
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* Parse for URLS in the source text.
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* 
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* @category Text
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* 
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* @package Text_Wiki
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* 
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* @author Paul M. Jones <pmjones@php.net>
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* 
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* @license LGPL
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* 
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* @version $Id: Url.php,v 1.3 2005/02/23 17:38:29 pmjones Exp $
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* 
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*/
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/**
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* 
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* Parse for URLS in the source text.
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* 
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* Various URL markings are supported: inline (the URL by itself),
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* numbered or footnote reference (where the URL is enclosed in square
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* brackets), and named reference (where the URL is enclosed in square
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* brackets and has a name included inside the brackets).  E.g.:
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*
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* inline    -- http://example.com
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* numbered  -- [http://example.com]
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* described -- [http://example.com Example Description]
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*
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* When rendering a URL token, this will convert URLs pointing to a .gif,
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* .jpg, or .png image into an inline <img /> tag (for the 'xhtml'
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* format).
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*
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* Token options are:
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* 
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* 'type' => ['inline'|'footnote'|'descr'] the type of URL
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* 
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* 'href' => the URL link href portion
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* 
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* 'text' => the displayed text of the URL link
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* 
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* @category Text
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* 
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* @package Text_Wiki
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* 
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* @author Paul M. Jones <pmjones@php.net>
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* 
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*/
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class Text_Wiki_Parse_Url extends Text_Wiki_Parse {
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    /**
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    * 
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    * Keeps a running count of numbered-reference URLs.
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    * 
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    * @access public
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    * 
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    * @var int
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    * 
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    */
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    var $footnoteCount = 0;
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    /**
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    * 
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    * URL schemes recognized by this rule.
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    * 
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    * @access public
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    * 
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    * @var array
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    * 
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    */
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    var $conf = array(
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        'schemes' => array(
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            'http://',
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            'https://',
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            'ftp://',
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            'gopher://',
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            'news://',
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            'mailto:'
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        )
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    );
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    /**
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    * 
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    * Constructor.
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    * 
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    * We override the constructor so we can comment the regex nicely.
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    * 
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    * @access public
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    * 
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    */
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    function Text_Wiki_Parse_Url(&$obj)
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    {
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        parent::Text_Wiki_Parse($obj);
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        // convert the list of recognized schemes to a regex-safe string,
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        // where the pattern delim is a slash
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        $tmp = array();
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        $list = $this->getConf('schemes', array());
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        foreach ($list as $val) {
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            $tmp[] = preg_quote($val, '/');
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        }
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        $schemes = implode('|', $tmp);
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        // build the regex
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        $this->regex =
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            "($schemes)" . // allowed schemes
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            "(" . // start pattern
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            "[^ \\/".'"'."\'{$this->wiki->delim}]*\\/" . // no spaces, backslashes, slashes, double-quotes, single quotes, or delimiters;
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            ")*" . // end pattern
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            "[^ \\t\\n\\/".'"'."\'{$this->wiki->delim}]*" .
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            "[A-Za-z0-9\\/?=&~_]";
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    }
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    /**
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    * 
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    * Find three different kinds of URLs in the source text.
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    *
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    * @access public
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    * 
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    */
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    function parse()
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    {
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        // -------------------------------------------------------------
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        // 
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        // Described-reference (named) URLs.
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        // 
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        // the regular expression for this kind of URL
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        $tmp_regex = '/\[(' . $this->regex . ') ([^\]]+)\]/';
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        // use a custom callback processing method to generate
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        // the replacement text for matches.
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        $this->wiki->source = preg_replace_callback(
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            $tmp_regex,
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            array(&$this, 'processDescr'),
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            $this->wiki->source
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        );
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        // -------------------------------------------------------------
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        // 
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        // Numbered-reference (footnote-style) URLs.
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        // 
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        // the regular expression for this kind of URL
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        $tmp_regex = '/\[(' . $this->regex . ')\]/U';
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        // use a custom callback processing method to generate
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        // the replacement text for matches.
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        $this->wiki->source = preg_replace_callback(
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            $tmp_regex,
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            array(&$this, 'processFootnote'),
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            $this->wiki->source
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        );
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        // -------------------------------------------------------------
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        // 
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        // Normal inline URLs.
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        // 
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        // the regular expression for this kind of URL
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        $tmp_regex = '/(^|[^A-Za-z])(' . $this->regex . ')(.*?)/';
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        // use the standard callback for inline URLs
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        $this->wiki->source = preg_replace_callback(
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            $tmp_regex,
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            array(&$this, 'process'),
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            $this->wiki->source
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        );
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    }
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    /**
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    * 
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    * Process inline URLs.
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    * 
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    * @param array &$matches
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    * 
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    * @param array $matches An array of matches from the parse() method
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    * as generated by preg_replace_callback.  $matches[0] is the full
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    * matched string, $matches[1] is the first matched pattern,
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    * $matches[2] is the second matched pattern, and so on.
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    * 
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    * @return string The processed text replacement.
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    * 
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    */ 
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    function process(&$matches)
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    {
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        // set options
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        $options = array(
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            'type' => 'inline',
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            'href' => $matches[2],
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            'text' => $matches[2]
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        );
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        // tokenize
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        return $matches[1] . $this->wiki->addToken($this->rule, $options) . $matches[5];
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    }
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    /**
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    * 
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    * Process numbered (footnote) URLs.
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    * 
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    * Token options are:
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    * @param array &$matches
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    * 
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    * @param array $matches An array of matches from the parse() method
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    * as generated by preg_replace_callback.  $matches[0] is the full
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    * matched string, $matches[1] is the first matched pattern,
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    * $matches[2] is the second matched pattern, and so on.
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    * 
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    * @return string The processed text replacement.
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    * 
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    */ 
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    function processFootnote(&$matches)
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    {
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        // keep a running count for footnotes 
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        $this->footnoteCount++;
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        // set options
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        $options = array(
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            'type' => 'footnote',
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            'href' => $matches[1],
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            'text' => $this->footnoteCount
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        );
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        // tokenize
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        return $this->wiki->addToken($this->rule, $options);
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    }
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    /**
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    * 
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    * Process described-reference (named-reference) URLs.
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    * 
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    * Token options are:
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    *     'type' => ['inline'|'footnote'|'descr'] the type of URL
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    *     'href' => the URL link href portion
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    *     'text' => the displayed text of the URL link
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    * 
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    * @param array &$matches
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    * 
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    * @param array $matches An array of matches from the parse() method
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    * as generated by preg_replace_callback.  $matches[0] is the full
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    * matched string, $matches[1] is the first matched pattern,
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    * $matches[2] is the second matched pattern, and so on.
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    * 
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    * @return string The processed text replacement.
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    * 
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    */ 
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    function processDescr(&$matches)
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    {
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        // set options
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        $options = array(
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            'type' => 'descr',
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            'href' => $matches[1],
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            'text' => $matches[4]
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        );
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        // tokenize
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        return $this->wiki->addToken($this->rule, $options);
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    }
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}
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?>