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/**
 * PEAR_XMLParser
 *
 * PHP versions 4 and 5
 *
 * @category   pear
 * @package    PEAR
 * @author     Greg Beaver &lt;cellog@php.net&gt;
 * @author     Stephan Schmidt (original XML_Unserializer code)
 * @copyright  1997-2009 The Authors
 * @license   http://opensource.org/licenses/bsd-license New BSD License
 * @link       http://pear.php.net/package/PEAR
 * @since      File available since Release 1.4.0a1
 */

/**
 * Parser for any xml file
 * @category  pear
 * @package   PEAR
 * @author    Greg Beaver &lt;cellog@php.net&gt;
 * @author    Stephan Schmidt (original XML_Unserializer code)
 * @copyright 1997-2009 The Authors
 * @license   http://opensource.org/licenses/bsd-license New BSD License
 * @version   Release: 1.10.16
 * @link      http://pear.php.net/package/PEAR
 * @since     Class available since Release 1.4.0a1
 */
class PEAR_XMLParser
{
    /**
     * unserilialized data
     * @var string $_serializedData
     */
    var $_unserializedData = null;

    /**
     * name of the root tag
     * @var string $_root
     */
    var $_root = null;

    /**
     * stack for all data that is found
     * @var array    $_dataStack
     */
    var $_dataStack = array();

    /**
     * stack for all values that are generated
     * @var array    $_valStack
     */
    var $_valStack = array();

    /**
     * current tag depth
     * @var int    $_depth
     */
    var $_depth = 0;

    /**
     * The XML encoding to use
     * @var string $encoding
     */
    var $encoding = &#039;ISO-8859-1&#039;;

    /**
     * @return array
     */
    function getData()
    {
        return $this-&gt;_unserializedData;
    }

    /**
     * @param string xml content
     * @return true|PEAR_Error
     */
    function parse($data)
    {
        if (!extension_loaded(&#039;xml&#039;)) {
            include_once &#039;PEAR.php&#039;;
            return PEAR::raiseError(&quot;XML Extension not found&quot;, 1);
        }
        $this-&gt;_dataStack =  $this-&gt;_valStack = array();
        $this-&gt;_depth = 0;

        if (
            strpos($data, &#039;encoding=&quot;UTF-8&quot;&#039;)
            || strpos($data, &#039;encoding=&quot;utf-8&quot;&#039;)
            || strpos($data, &quot;encoding=&#039;UTF-8&#039;&quot;)
            || strpos($data, &quot;encoding=&#039;utf-8&#039;&quot;)
        ) {
            $this-&gt;encoding = &#039;UTF-8&#039;;
        }

        $xp = xml_parser_create($this-&gt;encoding);
        xml_parser_set_option($xp, XML_OPTION_CASE_FOLDING, 0);
        xml_set_object($xp, $this);
        xml_set_element_handler($xp, &#039;startHandler&#039;, &#039;endHandler&#039;);
        xml_set_character_data_handler($xp, &#039;cdataHandler&#039;);
        if (!xml_parse($xp, $data)) {
            $msg = xml_error_string(xml_get_error_code($xp));
            $line = xml_get_current_line_number($xp);
            xml_parser_free($xp);
            include_once &#039;PEAR.php&#039;;
            return PEAR::raiseError(&quot;XML Error: &#039;$msg&#039; on line &#039;$line&#039;&quot;, 2);
        }
        xml_parser_free($xp);
        return true;
    }

    /**
     * Start element handler for XML parser
     *
     * @access private
     * @param  object $parser  XML parser object
     * @param  string $element XML element
     * @param  array  $attribs attributes of XML tag
     * @return void
     */
    function startHandler($parser, $element, $attribs)
    {
        $this-&gt;_depth++;
        $this-&gt;_dataStack[$this-&gt;_depth] = null;

        $val = array(
            &#039;name&#039;         =&gt; $element,
            &#039;value&#039;        =&gt; null,
            &#039;type&#039;         =&gt; &#039;string&#039;,
            &#039;childrenKeys&#039; =&gt; array(),
            &#039;aggregKeys&#039;   =&gt; array()
       );

        if (count($attribs) &gt; 0) {
            $val[&#039;children&#039;] = array();
            $val[&#039;type&#039;] = &#039;array&#039;;
            $val[&#039;children&#039;][&#039;attribs&#039;] = $attribs;
        }

        array_push($this-&gt;_valStack, $val);
    }

    /**
     * post-process data
     *
     * @param string $data
     * @param string $element element name
     */
    function postProcess($data, $element)
    {
        return trim($data);
    }

    /**
     * End element handler for XML parser
     *
     * @access private
     * @param  object XML parser object
     * @param  string
     * @return void
     */
    function endHandler($parser, $element)
    {
        $value = array_pop($this-&gt;_valStack);
        $data  = $this-&gt;postProcess($this-&gt;_dataStack[$this-&gt;_depth], $element);

        // adjust type of the value
        switch (strtolower($value[&#039;type&#039;])) {
            // unserialize an array
            case &#039;array&#039;:
                if ($data !== &#039;&#039;) {
                    $value[&#039;children&#039;][&#039;_content&#039;] = $data;
                }

                $value[&#039;value&#039;] = isset($value[&#039;children&#039;]) ? $value[&#039;children&#039;] : array();
                break;

            /*
             * unserialize a null value
             */
            case &#039;null&#039;:
                $data = null;
                break;

            /*
             * unserialize any scalar value
             */
            default:
                settype($data, $value[&#039;type&#039;]);
                $value[&#039;value&#039;] = $data;
                break;
        }

        $parent = array_pop($this-&gt;_valStack);
        if ($parent === null) {
            $this-&gt;_unserializedData = &amp;$value[&#039;value&#039;];
            $this-&gt;_root = &amp;$value[&#039;name&#039;];
            return true;
        }

        // parent has to be an array
        if (!isset($parent[&#039;children&#039;]) || !is_array($parent[&#039;children&#039;])) {
            $parent[&#039;children&#039;] = array();
            if ($parent[&#039;type&#039;] != &#039;array&#039;) {
                $parent[&#039;type&#039;] = &#039;array&#039;;
            }
        }

        if (!empty($value[&#039;name&#039;])) {
            // there already has been a tag with this name
            if (in_array($value[&#039;name&#039;], $parent[&#039;childrenKeys&#039;])) {
                // no aggregate has been created for this tag
                if (!in_array($value[&#039;name&#039;], $parent[&#039;aggregKeys&#039;])) {
                    if (isset($parent[&#039;children&#039;][$value[&#039;name&#039;]])) {
                        $parent[&#039;children&#039;][$value[&#039;name&#039;]] = array($parent[&#039;children&#039;][$value[&#039;name&#039;]]);
                    } else {
                        $parent[&#039;children&#039;][$value[&#039;name&#039;]] = array();
                    }
                    array_push($parent[&#039;aggregKeys&#039;], $value[&#039;name&#039;]);
                }
                array_push($parent[&#039;children&#039;][$value[&#039;name&#039;]], $value[&#039;value&#039;]);
            } else {
                $parent[&#039;children&#039;][$value[&#039;name&#039;]] = &amp;$value[&#039;value&#039;];
                array_push($parent[&#039;childrenKeys&#039;], $value[&#039;name&#039;]);
            }
        } else {
            array_push($parent[&#039;children&#039;],$value[&#039;value&#039;]);
        }
        array_push($this-&gt;_valStack, $parent);

        $this-&gt;_depth--;
    }

    /**
     * Handler for character data
     *
     * @access private
     * @param  object XML parser object
     * @param  string CDATA
     * @return void
     */
    function cdataHandler($parser, $cdata)
    {
        $this-&gt;_dataStack[$this-&gt;_depth] .= $cdata;
    }
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