path: root/pearlib/XML/Unserializer.php

<?PHP
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2002 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [email protected] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Stephan Schmidt <[email protected]>                       |
// +----------------------------------------------------------------------+
//
//    $Id: Unserializer.php,v 1.12 2003/10/26 19:38:21 schst Exp $

/**
 * uses PEAR error managemt
 */
require_once 'PEAR.php';

/**
 * uses XML_Parser to unserialize document
 */
require_once 'XML/Parser.php';

/**
 * error code for no serialization done
 */
define("XML_UNSERIALIZER_ERROR_NO_UNSERIALIZATION", 151);

/**
 * XML_Unserializer
 *
 * class to unserialize XML documents that have been created with
 * XML_Serializer. To unserialize an XML document you have to add
 * type hints to the XML_Serializer options.
 *
 * If no type hints are available, XML_Unserializer will guess how
 * the tags should be treated, that means complex structures will be
 * arrays and tags with only CData in them will be strings.
 *
 * <code>
 * require_once 'XML/Unserializer.php';
 *
 * //  be careful to always use the ampersand in front of the new operator 
 * $unserializer = &new XML_Unserializer();
 *
 * $unserializer->unserialize($xml);    
 *
 * $data = $unserializer->getUnserializedData();
 * <code>
 *
 * Possible options for the Unserializer are:
 *
 * 1. complexTypes => array|object
 * This is needed, when unserializing XML files w/o type hints. If set to
 * 'array' (default), all nested tags will be arrays, if set to 'object'
 * all nested tags will be objects, that means you have read access like:
 *
 * <code>
 * require_once 'XML/Unserializer.php';
 * $options = array('complexType' => 'object');
 * $unserializer = &new XML_Unserializer($options);
 *
 * $unserializer->unserialize('http://pear.php.net/rss.php');    
 *
 * $rss = $unserializer->getUnserializedData();
 * echo $rss->channel->item[3]->title;
 * </code>
 *
 * 2. keyAttribute
 * This lets you specify an attribute inside your tags, that are used as key
 * for associative arrays or object properties.
 * You will need this if you have XML that looks like this:
 *
 * <users>
 *   <user handle="schst">Stephan Schmidt</user>
 *   <user handle="ssb">Stig S. Bakken</user>
 * </users>
 *
 * Then you can use:
 * <code>
 * require_once 'XML/Unserializer.php';
 * $options = array('keyAttribute' => 'handle');
 * $unserializer = &new XML_Unserializer($options);
 *
 * $unserializer->unserialize($xml, false);    
 *
 * $users = $unserializer->getUnserializedData();
 * </code>
 *
 * @category XML
 * @package  XML_Serializer
 * @version  0.9.1
 * @author   Stephan Schmidt <[email protected]>
 * @uses     XML_Parser
 */
class XML_Unserializer extends XML_Parser {

   /**
    * default options for the serialization
    * @access private
    * @var array $_defaultOptions
    */
    var $_defaultOptions = array(
                         "complexType"       => "array",                // complex types will be converted to arrays, if no type hint is given
                         "keyAttribute"      => "_originalKey",         // get array key/property name from this attribute
                         "typeAttribute"     => "_type",                // get type from this attribute
                         "classAttribute"    => "_class",               // get class from this attribute (if not given, use tag name)
                         "parseAttributes"   => false,                  // parse the attributes of the tag into an array
                         "attributesArray"   => false,                  // parse them into sperate array (specify name of array here)
                         "prependAttributes" => "",                     // prepend attribute names with this string
                         "contentName"       => "_content",             // put cdata found in a tag that has been converted to a complex type in this key
                         "tagMap"            => array()                 // use this to map tagnames
                        );

   /**
    * actual options for the serialization
    * @access private
    * @var array $options
    */
    var $options = array();

   /**
    * do not use case folding
    * @var boolean $folding
    */
    var $folding = false;

   /**
    * 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;

   /**
    * constructor
    *
    * @access   public
    * @param    mixed   $options    array containing options for the serialization
    */
    function XML_Unserializer($options = null)
    {
        if (is_array($options)) {
            $this->options = array_merge($this->_defaultOptions, $options);
        } else {
            $this->options = $this->_defaultOptions;
        }
    }

   /**
    * return API version
    *
    * @access   public
    * @static
    * @return   string  $version API version
    */
    function apiVersion()
    {
        return "0.9";
    }

   /**
    * reset all options to default options
    *
    * @access   public
    * @see      setOption(), XML_Unserializer()
    */
    function resetOptions()
    {
        $this->options = $this->_defaultOptions;
    }

   /**
    * set an option
    *
    * You can use this method if you do not want to set all options in the constructor
    *
    * @access   public
    * @see      resetOption(), XML_Unserializer()
    */
    function setOption($name, $value)
    {
        $this->options[$name] = $value;
    }
    
   /**
    * unserialize data
    *
    * @access   public
    * @param    mixed    $data   data to unserialize (string, filename or resource)
    * @param    boolean  $isFile string should be treated as a file
    * @param    array    $options
    * @return   boolean  $success
    */
    function unserialize($data, $isFile = false, $options = null)
    {
        // reset parser and properties
        $this->XML_Parser(null,"event");
        $this->_unserializedData = null;
        $this->_root = null;
        
        // if options have been specified, use them instead
        // of the previously defined ones
        if (is_array($options)) {
            $optionsBak = $this->options;
            if (isset($options["overrideOptions"]) && $options["overrideOptions"] == true) {
                $this->options = array_merge($this->_defaultOptions, $options);
            } else {
                $this->options = array_merge($this->options, $options);
            }
        }
        else {
            $optionsBak = null;
        }

        $this->_valStack = array();
        $this->_dataStack = array();
        $this->_depth = 0;

        if (is_string($data)) {
            if ($isFile) {
                $result = $this->setInputFile($data);
                if (PEAR::isError($result)) {
                    return $result;
                }
                $result = $this->parse();
            } else {
                $result = $this->parseString($data,true);
            }
        } else {
           $this->setInput($data);
           $result = $this->parse();
        }
        
        if ($optionsBak !== null) {
            $this->options = $optionsBak;
        }
        
        if (PEAR::isError($result)) {
            return $result;
        }
        
        return  true;
    }

   /**
    *   get the result of the serialization
    *
    *   @access public
    *   @return string  $serializedData
    */
        function getUnserializedData()
        {
            if ($this->_root === null ) {
                return  $this->raiseError("No unserialized data available. Use XML_Unserializer::unserialize() first.", XML_UNSERIALIZER_ERROR_NO_UNSERIALIZATION);
            }
            return $this->_unserializedData;
        }
    
   /**
    *   get the name of the root tag
    *
    *   @access public
    *   @return string  $rootName
    */
        function getRootName()
        {
            if ($this->_root === null ) {
                return  $this->raiseError("No unserialized data available. Use XML_Unserializer::unserialize() first.", XML_UNSERIALIZER_ERROR_NO_UNSERIALIZATION);
            }
            return $this->_root;
        }
    
    /**
     * 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, $attribs)
    {
        if (isset($attribs[$this->options["typeAttribute"]])) {
            $type = $attribs[$this->options["typeAttribute"]];
        } else {
            $type = "string";
        }
        
        $this->_depth++;
        $this->_dataStack[$this->_depth] = null;

        $val = array(
                     "name"         => $element,
                     "value"        => null,
                     "type"         => $type,
                     "childrenKeys" => array(),
                     "aggregKeys"   => array()
                    );

        if ($this->options["parseAttributes"] == true && (count($attribs) > 0)) {
            $val["children"] = array();
            $val["type"] = $this->options["complexType"];

            if ($this->options["attributesArray"] != false) {
                $val["children"][$this->options["attributesArray"]] = $attribs;
            } else {
                foreach ($attribs as $attrib => $value) {
                    $val["children"][$this->options["prependAttributes"].$attrib] = $value;
                }
            }
        }
        
        if (isset($attribs[$this->options["keyAttribute"]])) {
            $val["name"] = $attribs[$this->options["keyAttribute"]];
        }

        if (isset($attribs[$this->options["classAttribute"]])) {
            $val["class"] = $attribs[$this->options["classAttribute"]];
        }

        array_push($this->_valStack, $val);
    }

    /**
     * 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->_valStack); 
        $data  = trim($this->_dataStack[$this->_depth]);
        
        // adjust type of the value
        switch(strtolower($value["type"])) {
            /*
             * unserialize an object
             */
            case "object":
                $classname  = $value["class"];
                if (is_array($this->options["tagMap"]) && isset($this->options["tagMap"][$classname])) {
                    $classname = $this->options["tagMap"][$classname];
                }
                
                // instantiate the class
                if (class_exists($classname)) {
                    $value["value"] = &new $classname;
                } else {
                    $value["value"] = &new stdClass;
                }
                if ($data !== '') {
                    $value["children"][$this->options["contentName"]] = $data;
                }
                
                // set properties
                foreach($value["children"] as $prop => $propVal) {
                    // check whether there is a special method to set this property
                    $setMethod = "set".$prop;
                    if (method_exists($value["value"], $setMethod)) {
                        call_user_func(array(&$value["value"], $setMethod), $propVal);
                    } else {
                        $value["value"]->$prop = $propVal;
                    }
                }
                //  check for magic function
                if (method_exists($value["value"], "__wakeup")) {
                    $value["value"]->__wakeup();
                }
                break;
                
            /*
             * unserialize an array
             */
            case "array":
                if ($data !== '') {
                    $value["children"][$this->options["contentName"]] = $data;
                }

                $value["value"] = $value["children"];
                break;

            /*
             * unserialize a null value
             */
            case "null":
                $data = null;
                break;
                
            /*
             * unserialize a resource => this is not possible :-(
             */
            case "resource":
                $value["value"] = $data;
                break;
                
            /*
             * unserialize any scalar value
             */
            default:
                settype($data, $value["type"]);
                $value["value"] = $data;
                break;
        }
        $parent = array_pop($this->_valStack);
        if ($parent === null) {
            $this->_unserializedData = &$value["value"];
            $this->_root = &$value["name"];
            return true;
        } else {
            // parent has to be an array
            if (!isset($parent["children"]) || !is_array($parent["children"])) {
                $parent["children"] = array();
                if (!in_array($parent["type"], array("array", "object"))) {
                    $parent["type"] = $this->options["complexType"];
                    if ($this->options["complexType"] == "object") {
                        $parent["class"] = $parent["name"];
                    }
                }
            }
            
            if (!empty($value["name"])) {
                // there already has been a tag with this name
                if (in_array($value["name"], $parent["childrenKeys"])) {
                    // no aggregate has been created for this tag
                    if (!in_array($value["name"], $parent["aggregKeys"])) {
                        $parent["children"][$value["name"]] = array($parent["children"][$value["name"]]);
                        array_push($parent["aggregKeys"], $value["name"]);
                    }
                    array_push($parent["children"][$value["name"]], $value["value"]);
                } else {
                    $parent["children"][$value["name"]] = &$value["value"];
                    array_push($parent["childrenKeys"], $value["name"]);
                }
            } else {
                array_push($parent["children"],$value["value"]);
            }
            array_push($this->_valStack, $parent);
        }
        
        $this->_depth--;
    }

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