includes/wikiengine/Parse.php
author dan@fuhry
Wed, 13 Jun 2007 19:52:02 -0400
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<?php
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// vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4:
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/**
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 * Baseline rule class for extension into a "real" parser component.
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 *
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 * PHP versions 4 and 5
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 *
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 * @category   Text
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 * @package    Text_Wiki
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 * @author     Paul M. Jones <pmjones@php.net>
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 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
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 * @version    CVS: $Id: Parse.php,v 1.5 2005/07/29 08:57:29 toggg Exp $
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 * @link       http://pear.php.net/package/Text_Wiki
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 */
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/**
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 * Baseline rule class for extension into a "real" parser component.
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 *
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 * Text_Wiki_Rule classes do not stand on their own; they are called by a
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 * Text_Wiki object, typcially in the transform() method. Each rule class
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 * performs three main activities: parse, process, and render.
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 *
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 * The parse() method takes a regex and applies it to the whole block of
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 * source text at one time. Each match is sent as $matches to the
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 * process() method.
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 *
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 * The process() method acts on the matched text from the source, and
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 * then processes the source text is some way.  This may mean the
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 * creation of a delimited token using addToken().  In every case, the
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 * process() method returns the text that should replace the matched text
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 * from parse().
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 *
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 * @category   Text
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 * @package    Text_Wiki
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 * @author     Paul M. Jones <pmjones@php.net>
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 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
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 * @version    Release: @package_version@
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 * @link       http://pear.php.net/package/Text_Wiki
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 */
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class Text_Wiki_Parse {
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    /**
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    *
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    * Configuration options for this parser rule.
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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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    */
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    var $conf = array();
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    /**
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    *
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    * Regular expression to find matching text for this rule.
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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 = null;
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    /**
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    *
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    * The name of this rule for new token array elements.
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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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    */
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    var $rule = null;
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    /**
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    *
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    * A reference to the calling Text_Wiki object.
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    *
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    * This is needed so that each rule has access to the same source
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    * text, token set, URLs, interwiki maps, page names, etc.
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    *
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    * @access public
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    *
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    * @var object
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    */
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    var $wiki = null;
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    /**
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    *
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    * Constructor for this parser rule.
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    *
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    * @access public
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    *
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    * @param object &$obj The calling "parent" Text_Wiki object.
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    *
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    */
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    function Text_Wiki_Parse(&$obj)
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    {
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        // set the reference to the calling Text_Wiki object;
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        // this allows us access to the shared source text, token
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        // array, etc.
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        $this->wiki =& $obj;
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        // set the name of this rule; generally used when adding
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        // to the tokens array. strip off the Text_Wiki_Parse_ portion.
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        // text_wiki_parse_
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        // 0123456789012345
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        $tmp = substr(get_class($this), 16);
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        $this->rule = ucwords(strtolower($tmp));
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        // override config options for the rule if specified
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        if (isset($this->wiki->parseConf[$this->rule]) &&
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            is_array($this->wiki->parseConf[$this->rule])) {
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            $this->conf = array_merge(
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                $this->conf,
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                $this->wiki->parseConf[$this->rule]
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            );
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        }
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    }
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    /**
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    *
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    * Abstrct method to parse source text for matches.
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    *
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    * Applies the rule's regular expression to the source text, passes
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    * every match to the process() method, and replaces the matched text
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    * with the results of the processing.
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    *
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    * @access public
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    *
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    * @see Text_Wiki_Parse::process()
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    *
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    */
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    function parse()
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    {
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        $this->wiki->source = preg_replace_callback(
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            $this->regex,
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            array(&$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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    * Abstract method to generate replacements for matched text.
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    *
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    * @access public
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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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    * $matches[2] is the second matched pattern, and so on.
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    *
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    * @return string The processed text replacement; defaults to the
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    * full matched string (i.e., no changes to the text).
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    *
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    * @see Text_Wiki_Parse::parse()
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    *
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    */
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    function process(&$matches)
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    {
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        return $matches[0];
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    }
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    /**
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    *
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    * Simple method to safely get configuration key values.
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    *
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    * @access public
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    *
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    * @param string $key The configuration key.
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    *
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    * @param mixed $default If the key does not exist, return this value
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    * instead.
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    *
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    * @return mixed The configuration key value (if it exists) or the
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    * default value (if not).
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    *
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    */
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    function getConf($key, $default = null)
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    {
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        if (isset($this->conf[$key])) {
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            return $this->conf[$key];
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        } else {
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            return $default;
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        }
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    }
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    /**
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    *
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    * Extract 'attribute="value"' portions of wiki markup.
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    *
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    * This kind of markup is typically used only in macros, but is useful
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    * anywhere.
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    *
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    * The syntax is pretty strict; there can be no spaces between the
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    * option name, the equals, and the first double-quote; the value
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    * must be surrounded by double-quotes.  You can escape characters in
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    * the value with a backslash, and the backslash will be stripped for
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    * you.
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    *
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    * @access public
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    *
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    * @param string $text The "attributes" portion of markup.
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    *
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    * @return array An associative array of key-value pairs where the
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    * key is the option name and the value is the option value.
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    *
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    */
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    function getAttrs($text)
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    {
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        // find the =" sections;
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        $tmp = explode('="', trim($text));
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        // basic setup
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        $k = count($tmp) - 1;
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        $attrs = array();
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        $key = null;
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        // loop through the sections
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        foreach ($tmp as $i => $val) {
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            // first element is always the first key
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            if ($i == 0) {
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                $key = trim($val);
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                continue;
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            }
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            // find the last double-quote in the value.
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            // the part to the left is the value for the last key,
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            // the part to the right is the next key name
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            $pos = strrpos($val, '"');
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            $attrs[$key] = stripslashes(substr($val, 0, $pos));
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            $key = trim(substr($val, $pos+1));
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        }
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        return $attrs;
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    }
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}
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?>