xml.php

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<?php
/* SVN FILE: $Id: xml.php 8264 2009-07-31 01:50:14Z gwoo $ */
/**
 * XML handling for Cake.
 *
 * The methods in these classes enable the datasources that use XML to work.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework (http://www.cakephp.org)
 * Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright     Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 * @link          http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP v .0.10.3.1400
 * @version       $Revision: 8264 $
 * @modifiedby    $LastChangedBy: gwoo $
 * @lastmodified  $Date: 2009-07-30 21:50:14 -0400 (Thu, 30 Jul 2009) $
 * @license       http://www.opensource.org/licenses/mit-license.php The MIT License
 */
App::import('Core', 'Set');
/**
 * XML node.
 *
 * Single XML node in an XML tree.
 *
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP v .0.10.3.1400
 */
class XmlNode extends Object {
/**
 * Name of node
 *
 * @var string
 * @access public
 */
    var $name = null;
/**
 * Node namespace
 *
 * @var string
 * @access public
 */
    var $namespace = null;
/**
 * Namespaces defined for this node and all child nodes
 *
 * @var array
 * @access public
 */
    var $namespaces = array();
/**
 * Value of node
 *
 * @var string
 * @access public
 */
    var $value;
/**
 * Attributes on this node
 *
 * @var array
 * @access public
 */
    var $attributes = array();
/**
 * This node's children
 *
 * @var array
 * @access public
 */
    var $children = array();
/**
 * Reference to parent node.
 *
 * @var XmlNode
 * @access private
 */
    var $__parent = null;
/**
 * Constructor.
 *
 * @param string $name Node name
 * @param array $attributes Node attributes
 * @param mixed $value Node contents (text)
 * @param array $children Node children
 */
    function __construct($name = null, $value = null, $namespace = null) {
        if (strpos($name, ':') !== false) {
            list($prefix, $name) = explode(':', $name);
            if (!$namespace) {
                $namespace = $prefix;
            }
        }
        $this->name = $name;
        if ($namespace) {
            $this->namespace = $namespace;
        }

        if (is_array($value) || is_object($value)) {
            $this->normalize($value);
        } elseif (!empty($value) || $value === 0 || $value === '0') {
            $this->createTextNode($value);
        }
    }

/**
 * Adds a namespace to the current node
 *
 * @param string $prefix The namespace prefix
 * @param string $url The namespace DTD URL
 * @return void
 */
    function addNamespace($prefix, $url) {
        if ($ns = Xml::addGlobalNs($prefix, $url)) {
            $this->namespaces = array_merge($this->namespaces, $ns);
            return true;
        }
        return false;
    }
/**
 * Adds a namespace to the current node
 *
 * @param string $prefix The namespace prefix
 * @param string $url The namespace DTD URL
 * @return void
 */
    function removeNamespace($prefix) {
        if (Xml::removeGlobalNs($prefix)) {
            return true;
        }
        return false;
    }
/**
 * Creates an XmlNode object that can be appended to this document or a node in it
 *
 * @param string $name Node name
 * @param string $value Node value
 * @param string $namespace Node namespace
 * @return object XmlNode
 */
    function &createNode($name = null, $value = null, $namespace = false) {
        $node =& new XmlNode($name, $value, $namespace);
        $node->setParent($this);
        return $node;
    }
/**
 * Creates an XmlElement object that can be appended to this document or a node in it
 *
 * @param string $name Element name
 * @param string $value Element value
 * @param array $attributes Element attributes
 * @param string $namespace Node namespace
 * @return object XmlElement
 */
    function &createElement($name = null, $value = null, $attributes = array(), $namespace = false) {
        $element =& new XmlElement($name, $value, $attributes, $namespace);
        $element->setParent($this);
        return $element;
    }
/**
 * Creates an XmlTextNode object that can be appended to this document or a node in it
 *
 * @param string $value Node value
 * @return object XmlTextNode
 */
    function &createTextNode($value = null) {
        $node = new XmlTextNode($value);
        $node->setParent($this);
        return $node;
    }
/**
 * Gets the XML element properties from an object.
 *
 * @param object $object Object to get properties from
 * @return array Properties from object
 * @access public
 */
    function normalize($object, $keyName = null, $options = array()) {
        if (is_a($object, 'XmlNode')) {
            return $object;
        }
        $name = null;
        $options += array('format' => 'attributes');

        if ($keyName !== null && !is_numeric($keyName)) {
            $name = $keyName;
        } elseif (!empty($object->_name_)) {
            $name = $object->_name_;
        } elseif (isset($object->name)) {
            $name = $object->name;
        } elseif ($options['format'] == 'attributes') {
            $name = get_class($object);
        }

        $tagOpts = $this->__tagOptions($name);

        if ($tagOpts === false) {
            return;
        }

        if (isset($tagOpts['name'])) {
            $name = $tagOpts['name'];
        } elseif ($name != strtolower($name)) {
            $name = Inflector::slug(Inflector::underscore($name));
        }

        if (!empty($name)) {
            $node =& $this->createElement($name);
        } else {
            $node =& $this;
        }

        $namespace = array();
        $attributes = array();
        $children = array();
        $chldObjs = array();

        if (is_object($object)) {
            $chldObjs = get_object_vars($object);
        } elseif (is_array($object)) {
            $chldObjs = $object;
        } elseif (!empty($object) || $object === 0) {
            $node->createTextNode($object);
        }
        $attr = array();

        if (isset($tagOpts['attributes'])) {
            $attr = $tagOpts['attributes'];
        }
        if (isset($tagOpts['value']) && isset($chldObjs[$tagOpts['value']])) {
            $node->createTextNode($chldObjs[$tagOpts['value']]);
            unset($chldObjs[$tagOpts['value']]);
        }

        $n = $name;
        if (!empty($chldObjs['_name_'])) {
            $n = null;
            unset($chldObjs['_name_']);
        }
        $c = 0;

        foreach ($chldObjs as $key => $val) {
            if (in_array($key, $attr) && !is_object($val) && !is_array($val)) {
                $attributes[$key] = $val;
            } else {
                if (!isset($tagOpts['children']) || $tagOpts['children'] === array() || (is_array($tagOpts['children']) && in_array($key, $tagOpts['children']))) {
                    if (!is_numeric($key)) {
                        $n = $key;
                    }
                    if (is_array($val)) {
                        foreach ($val as $n2 => $obj2) {
                            if (is_numeric($n2)) {
                                $n2 = $n;
                            }
                            $node->normalize($obj2, $n2, $options);
                        }
                    } else {
                        if (is_object($val)) {

                            $node->normalize($val, $n, $options);
                        } elseif ($options['format'] == 'tags' && $this->__tagOptions($key) !== false) {
                            $tmp =& $node->createElement($key);
                            if (!empty($val) || $val === 0) {
                                $tmp->createTextNode($val);
                            }
                        } elseif ($options['format'] == 'attributes') {
                            $node->addAttribute($key, $val);
                        }
                    }
                }
            }
            $c++;
        }
        if (!empty($name)) {
            return $node;
        }
        return $children;
    }
/**
 * Gets the tag-specific options for the given node name
 *
 * @param string $name XML tag name
 * @param string $option The specific option to query.  Omit for all options
 * @return mixed A specific option value if $option is specified, otherwise an array of all options
 * @access private
 */
    function __tagOptions($name, $option = null) {
        if (isset($this->__tags[$name])) {
            $tagOpts = $this->__tags[$name];
        } elseif (isset($this->__tags[strtolower($name)])) {
            $tagOpts = $this->__tags[strtolower($name)];
        } else {
            return null;
        }
        if ($tagOpts === false) {
            return false;
        }
        if (empty($option)) {
            return $tagOpts;
        }
        if (isset($tagOpts[$option])) {
            return $tagOpts[$option];
        }
        return null;
    }
/**
 * Returns the fully-qualified XML node name, with namespace
 *
 * @access public
 */
    function name() {
        if (!empty($this->namespace)) {
            $_this =& XmlManager::getInstance();
            if (!isset($_this->options['verifyNs']) || !$_this->options['verifyNs'] || in_array($this->namespace, array_keys($_this->namespaces))) {
                return $this->namespace . ':' . $this->name;
            }
        }
        return $this->name;
    }
/**
 * Sets the parent node of this XmlNode.
 *
 * @access public
 */
    function setParent(&$parent) {
        if (strtolower(get_class($this)) == 'xml') {
            return;
        }
        if (isset($this->__parent) && is_object($this->__parent)) {
            if ($this->__parent->compare($parent)) {
                return;
            }
            foreach ($this->__parent->children as $i => $child) {
                if ($this->compare($child)) {
                    array_splice($this->__parent->children, $i, 1);
                    break;
                }
            }
        }
        if ($parent == null) {
            unset($this->__parent);
        } else {
            $parent->children[] =& $this;
            $this->__parent =& $parent;
        }
    }
/**
 * Returns a copy of self.
 *
 * @return object Cloned instance
 * @access public
 */
    function cloneNode() {
        return clone($this);
    }
/**
 * Compares $node to this XmlNode object
 *
 * @param object An XmlNode or subclass instance
 * @return boolean True if the nodes match, false otherwise
 * @access public
 */
    function compare($node) {
        $keys = array(get_object_vars($this), get_object_vars($node));
        return ($keys[0] === $keys[1]);
    }
/**
 * Append given node as a child.
 *
 * @param object $child XmlNode with appended child
 * @param array $options XML generator options for objects and arrays
 * @return object A reference to the appended child node
 * @access public
 */
    function &append(&$child, $options = array()) {
        if (empty($child)) {
            $return = false;
            return $return;
        }

        if (is_object($child)) {
            if ($this->compare($child)) {
                trigger_error('Cannot append a node to itself.');
                $return = false;
                return $return;
            }
        } else if (is_array($child)) {
            $child = Set::map($child);
            if (is_array($child)) {
                if (!is_a(current($child), 'XmlNode')) {
                    foreach ($child as $i => $childNode) {
                        $child[$i] = $this->normalize($childNode, null, $options);
                    }
                } else {
                    foreach ($child as $childNode) {
                        $this->append($childNode, $options);
                    }
                }
                return $child;
            }
        } else {
            $attributes = array();
            if (func_num_args() >= 2) {
                $attributes = func_get_arg(1);
            }
            $child =& $this->createNode($child, null, $attributes);
        }

        $child = $this->normalize($child, null, $options);

        if (empty($child->namespace) && !empty($this->namespace)) {
            $child->namespace = $this->namespace;
        }

        if (is_a($child, 'XmlNode')) {
            $child->setParent($this);
        }

        return $child;
    }
/**
 * Returns first child node, or null if empty.
 *
 * @return object First XmlNode
 * @access public
 */
    function &first() {
        if (isset($this->children[0])) {
            return $this->children[0];
        } else {
            $return = null;
            return $return;
        }
    }
/**
 * Returns last child node, or null if empty.
 *
 * @return object Last XmlNode
 * @access public
 */
    function &last() {
        if (count($this->children) > 0) {
            return $this->children[count($this->children) - 1];
        } else {
            $return = null;
            return $return;
        }
    }
/**
 * Returns child node with given ID.
 *
 * @param string $id Name of child node
 * @return object Child XmlNode
 * @access public
 */
    function &child($id) {
        $null = null;

        if (is_int($id)) {
            if (isset($this->children[$id])) {
                return $this->children[$id];
            } else {
                return null;
            }
        } elseif (is_string($id)) {
            for ($i = 0; $i < count($this->children); $i++) {
                if ($this->children[$i]->name == $id) {
                    return $this->children[$i];
                }
            }
        }
        return $null;
    }
/**
 * Gets a list of childnodes with the given tag name.
 *
 * @param string $name Tag name of child nodes
 * @return array An array of XmlNodes with the given tag name
 * @access public
 */
    function children($name) {
        $nodes = array();
        $count = count($this->children);
        for ($i = 0; $i < $count; $i++) {
            if ($this->children[$i]->name == $name) {
                $nodes[] =& $this->children[$i];
            }
        }
        return $nodes;
    }
/**
 * Gets a reference to the next child node in the list of this node's parent.
 *
 * @return object A reference to the XmlNode object
 * @access public
 */
    function &nextSibling() {
        $null = null;
        $count = count($this->__parent->children);
        for ($i = 0; $i < $count; $i++) {
            if ($this->__parent->children[$i] == $this) {
                if ($i >= $count - 1 || !isset($this->__parent->children[$i + 1])) {
                    return $null;
                }
                return $this->__parent->children[$i + 1];
            }
        }
        return $null;
    }
/**
 * Gets a reference to the previous child node in the list of this node's parent.
 *
 * @return object A reference to the XmlNode object
 * @access public
 */
    function &previousSibling() {
        $null = null;
        $count = count($this->__parent->children);
        for ($i = 0; $i < $count; $i++) {
            if ($this->__parent->children[$i] == $this) {
                if ($i == 0 || !isset($this->__parent->children[$i - 1])) {
                    return $null;
                }
                return $this->__parent->children[$i - 1];
            }
        }
        return $null;
    }
/**
 * Returns parent node.
 *
 * @return object Parent XmlNode
 * @access public
 */
    function &parent() {
        return $this->__parent;
    }
/**
 * Returns the XML document to which this node belongs
 *
 * @return object Parent XML object
 * @access public
 */
    function &document() {
        $document =& $this;
        while (true) {
            if (get_class($document) == 'Xml' || $document == null) {
                break;
            }
            $document =& $document->parent();
        }
        return $document;
    }
/**
 * Returns true if this structure has child nodes.
 *
 * @return bool
 * @access public
 */
    function hasChildren() {
        if (is_array($this->children) && count($this->children) > 0) {
            return true;
        }
        return false;
    }
/**
 * Returns this XML structure as a string.
 *
 * @return string String representation of the XML structure.
 * @access public
 */
    function toString($options = array(), $depth = 0) {
        if (is_int($options)) {
            $depth = $options;
            $options = array();
        }
        $defaults = array('cdata' => true, 'whitespace' => false, 'convertEntities' => false, 'showEmpty' => true, 'leaveOpen' => false);
        $options = array_merge($defaults, Xml::options(), $options);
        $tag = !(strpos($this->name, '#') === 0);
        $d = '';

        if ($tag) {
            if ($options['whitespace']) {
                $d .= str_repeat("\t", $depth);
            }

            $d .= '<' . $this->name();
            if (count($this->namespaces) > 0) {
                foreach ($this->namespaces as $key => $val) {
                    $val = str_replace('"', '\"', $val);
                    $d .= ' xmlns:' . $key . '="' . $val . '"';
                }
            }

            $parent =& $this->parent();
            if ($parent->name === '#document' && count($parent->namespaces) > 0) {
                foreach ($parent->namespaces as $key => $val) {
                    $val = str_replace('"', '\"', $val);
                    $d .= ' xmlns:' . $key . '="' . $val . '"';
                }
            }

            if (is_array($this->attributes) && count($this->attributes) > 0) {
                foreach ($this->attributes as $key => $val) {
                    if (is_bool($val) && $val === false) {
                        $val = 0;
                    }
                    $d .= ' ' . $key . '="' . htmlspecialchars($val, ENT_QUOTES, Configure::read('App.encoding')) . '"';
                }
            }
        }

        if (!$this->hasChildren() && empty($this->value) && $this->value !== 0 && $tag) {
            if (!$options['leaveOpen']) {
                $d .= ' />';
            }
            if ($options['whitespace']) {
                $d .= "\n";
            }
        } elseif ($tag || $this->hasChildren()) {
            if ($tag) {
                $d .= '>';
            }
            if ($this->hasChildren()) {
                if ($options['whitespace']) {
                    $d .= "\n";
                }
                $count = count($this->children);
                $cDepth = $depth + 1;
                for ($i = 0; $i < $count; $i++) {
                    $d .= $this->children[$i]->toString($options, $cDepth);
                }
                if ($tag) {
                    if ($options['whitespace'] && $tag) {
                        $d .= str_repeat("\t", $depth);
                    }
                    if (!$options['leaveOpen']) {
                        $d .= '</' . $this->name() . '>';
                    }
                    if ($options['whitespace']) {
                        $d .= "\n";
                    }
                }
            }
        }
        return $d;
    }
/**
 * Return array representation of current object.
 *
 * @param boolean $camelize true will camelize child nodes, false will not alter node names
 * @return array Array representation
 * @access public
 */
    function toArray($camelize = true) {
        $out = $this->attributes;
        $multi = null;

        foreach ($this->children as $child) {
            $key = $camelize ? Inflector::camelize($child->name) : $child->name;

            if (is_a($child, 'XmlTextNode')) {
                $out['value'] = $child->value;
                continue;
            } elseif (isset($child->children[0]) && is_a($child->children[0], 'XmlTextNode')) {
                $value = $child->children[0]->value;

                if ($child->attributes) {
                    $value = array_merge(array('value' => $value), $child->attributes);
                }

                if (isset($out[$child->name]) || isset($multi[$key])) {
                    if (!isset($multi[$key])) {
                        $multi[$key] = array($out[$child->name]);
                        unset($out[$child->name]);
                    }
                    $multi[$key][] = $value;
                } else {
                    $out[$child->name] = $value;
                }
                continue;
            } elseif (count($child->children) === 0 && $child->value == '') {
                $value = $child->attributes;

                if (isset($out[$child->name]) || isset($multi[$key])) {
                    if (!isset($multi[$key])) {
                        $multi[$key] = array($out[$child->name]);
                        unset($out[$child->name]);
                    }
                    $multi[$key][] = $value;
                } else {
                    $out[$key] = $value;
                }
                continue;
            } else {
                $value = $child->toArray($camelize);
            }

            if (!isset($out[$key])) {
                $out[$key] = $value;
            } else {
                if (!is_array($out[$key]) || !isset($out[$key][0])) {
                    $out[$key] = array($out[$key]);
                }
                $out[$key][] = $value;
            }
        }

        if (isset($multi)) {
            $out = array_merge($out, $multi);
        }
        return $out;
    }
/**
 * Returns data from toString when this object is converted to a string.
 *
 * @return string String representation of this structure.
 * @access private
 */
    function __toString() {
        return $this->toString();
    }
/**
 * Debug method. Deletes the parent. Also deletes this node's children,
 * if given the $recursive parameter.
 *
 * @param boolean $recursive Recursively delete elements.
 * @access private
 */
    function __killParent($recursive = true) {
        unset($this->__parent, $this->_log);
        if ($recursive && $this->hasChildren()) {
            for ($i = 0; $i < count($this->children); $i++) {
                $this->children[$i]->__killParent(true);
            }
        }
    }
}

/**
 * Main XML class.
 *
 * Parses and stores XML data, representing the root of an XML document
 *
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP v .0.10.3.1400
 */
class Xml extends XmlNode {

/**
 * Resource handle to XML parser.
 *
 * @var resource
 * @access private
 */
    var $__parser;
/**
 * File handle to XML indata file.
 *
 * @var resource
 * @access private
 */
    var $__file;
/**
 * Raw XML string data (for loading purposes)
 *
 * @var string
 * @access private
 */
    var $__rawData = null;

/**
 * XML document header
 *
 * @var string
 * @access private
 */
    var $__header = null;

/**
 * Default array keys/object properties to use as tag names when converting objects or array
 * structures to XML. Set by passing $options['tags'] to this object's constructor.
 *
 * @var array
 * @access private
 */
    var $__tags = array();

/**
 * XML document version
 *
 * @var string
 * @access private
 */
    var $version = '1.0';

/**
 * XML document encoding
 *
 * @var string
 * @access private
 */
    var $encoding = 'UTF-8';

/**
 * Constructor.  Sets up the XML parser with options, gives it this object as
 * its XML object, and sets some variables.
 *
 * @param mixed $input The content with which this XML document should be initialized.  Can be a
 *                     string, array or object.  If a string is specified, it may be a literal XML
 *                     document, or a URL or file path to read from.
 * @param array $options Options to set up with, valid options are as follows:
 *                      - 'root': The name of the root element, defaults to '#document'
 *                      - 'version': The XML version, defaults to '1.0'
 *                      - 'encoding': Document encoding, defaults to 'UTF-8'
 *                      - 'namespaces': An array of namespaces (as strings) used in this document
 *                      - 'format': Specifies the format this document converts to when parsed or
 *                         rendered out as text, either 'attributes' or 'tags',
 *                         defaults to 'attributes'
 *                       - 'tags': An array specifying any tag-specific formatting options, indexed
 *                         by tag name.  See XmlNode::normalize().
 * @see XmlNode::normalize()
 */
    function __construct($input = null, $options = array()) {
        $defaults = array(
            'root' => '#document', 'tags' => array(), 'namespaces' => array(),
            'version' => '1.0', 'encoding' => 'UTF-8', 'format' => 'attributes'
        );
        $options = array_merge($defaults, Xml::options(), $options);

        foreach (array('version', 'encoding', 'namespaces') as $key) {
            $this->{$key} = $options[$key];
        }
        $this->__tags = $options['tags'];
        parent::__construct('#document');

        if ($options['root'] !== '#document') {
            $Root = $this->createNode($options['root']);
        } else {
            $Root =& $this;
        }

        if (!empty($input)) {
            if (is_string($input)) {
                $Root->load($input);
            } elseif (is_array($input) || is_object($input)) {
                $Root->append($input, $options);
            }
        }
        // if (Configure::read('App.encoding') !== null) {
        //  $this->encoding = Configure::read('App.encoding');
        // }
    }
/**
 * Initialize XML object from a given XML string. Returns false on error.
 *
 * @param string $input XML string, a path to a file, or an HTTP resource to load
 * @return boolean Success
 * @access public
 */
    function load($input) {
        if (!is_string($input)) {
            return false;
        }
        $this->__rawData = null;
        $this->__header = null;

        if (strstr($input, "<")) {
            $this->__rawData = $input;
        } elseif (strpos($input, 'http://') === 0 || strpos($input, 'https://') === 0) {
            App::import('Core', 'HttpSocket');
            $socket = new HttpSocket();
            $this->__rawData = $socket->get($input);
        } elseif (file_exists($input)) {
            $this->__rawData = file_get_contents($input);
        } else {
            trigger_error('XML cannot be read');
            return false;
        }
        return $this->parse();
    }
/**
 * Parses and creates XML nodes from the __rawData property.
 *
 * @return boolean Success
 * @access public
 * @see Xml::load()
 * @todo figure out how to link attributes and namespaces
 */
    function parse() {
        $this->__initParser();
        $this->__rawData = trim($this->__rawData);
        $this->__header = trim(str_replace(
            a('<' . '?', '?' . '>'),
            a('', ''),
            substr($this->__rawData, 0, strpos($this->__rawData, '?' . '>'))
        ));

        xml_parse_into_struct($this->__parser, $this->__rawData, $vals);
        $xml =& $this;
        $count = count($vals);

        for ($i = 0; $i < $count; $i++) {
            $data = $vals[$i];
            $data += array('tag' => null, 'value' => null, 'attributes' => array());

            switch ($data['type']) {
                case "open" :
                    $xml =& $xml->createElement($data['tag'], $data['value'], $data['attributes']);
                break;
                case "close" :
                    $xml =& $xml->parent();
                break;
                case "complete" :
                    $xml->createElement($data['tag'], $data['value'], $data['attributes']);
                break;
                case 'cdata':
                    $xml->createTextNode($data['value']);
                break;
            }
        }
        return true;
    }
/**
 * Initializes the XML parser resource
 *
 * @return void
 * @access private
 */
    function __initParser() {
        if (empty($this->__parser)) {
            $this->__parser = xml_parser_create();
            xml_set_object($this->__parser, $this);
            xml_parser_set_option($this->__parser, XML_OPTION_CASE_FOLDING, 0);
            xml_parser_set_option($this->__parser, XML_OPTION_SKIP_WHITE, 1);
        }
    }
/**
 * Returns a string representation of the XML object
 *
 * @param mixed $options If boolean: whether to include the XML header with the document
 *        (defaults to true); if an array, overrides the default XML generation options
 * @return string XML data
 * @access public
 * @deprecated
 * @see Xml::toString()
 */
    function compose($options = array()) {
        return $this->toString($options);
    }
/**
 * If debug mode is on, this method echoes an error message.
 *
 * @param string $msg Error message
 * @param integer $code Error code
 * @param integer $line Line in file
 * @access public
 */
    function error($msg, $code = 0, $line = 0) {
        if (Configure::read('debug')) {
            echo $msg . " " . $code . " " . $line;
        }
    }
/**
 * Returns a string with a textual description of the error code, or FALSE if no description was found.
 *
 * @param integer $code Error code
 * @return string Error message
 * @access public
 */
    function getError($code) {
        $r = @xml_error_string($code);
        return $r;
    }

// Overridden functions from superclass

/**
 * Get next element. NOT implemented.
 *
 * @return object
 * @access public
 */
    function &next() {
        $return = null;
        return $return;
    }
/**
 * Get previous element. NOT implemented.
 *
 * @return object
 * @access public
 */
    function &previous() {
        $return = null;
        return $return;
    }
/**
 * Get parent element. NOT implemented.
 *
 * @return object
 * @access public
 */
    function &parent() {
        $return = null;
        return $return;
    }
/**
 * Adds a namespace to the current document
 *
 * @param string $prefix The namespace prefix
 * @param string $url The namespace DTD URL
 * @return void
 */
    function addNamespace($prefix, $url) {
        if ($count = count($this->children)) {
            for ($i = 0; $i < $count; $i++) {
                $this->children[$i]->addNamespace($prefix, $url);
            }
            return true;
        }
        return parent::addNamespace($prefix, $url);
    }
/**
 * Removes a namespace to the current document
 *
 * @param string $prefix The namespace prefix
 * @return void
 */
    function removeNamespace($prefix) {
        if ($count = count($this->children)) {
            for ($i = 0; $i < $count; $i++) {
                $this->children[$i]->removeNamespace($prefix);
            }
            return true;
        }
        return parent::removeNamespace($prefix);
    }
/**
 * Return string representation of current object.
 *
 * @return string String representation
 * @access public
 */
    function toString($options = array()) {
        if (is_bool($options)) {
            $options = array('header' => $options);
        }

        $defaults = array('header' => false, 'encoding' => $this->encoding);
        $options = array_merge($defaults, Xml::options(), $options);
        $data = parent::toString($options, 0);

        if ($options['header']) {
            if (!empty($this->__header)) {
                return $this->header($this->__header)  . "\n" . $data;
            }
            return $this->header()  . "\n" . $data;
        }

        return $data;
    }
/**
 * Return a header used on the first line of the xml file
 *
 * @param  mixed  $attrib attributes of the header element
 * @return string formated header
 */
    function header($attrib = array()) {
        $header = 'xml';
        if (is_string($attrib)) {
            $header = $attrib;
        } else {

            $attrib = array_merge(array('version' => $this->version, 'encoding' => $this->encoding), $attrib);
            foreach ($attrib as $key=>$val) {
                $header .= ' ' . $key . '="' . $val . '"';
            }
        }
        return '<' . '?' . $header . ' ?' . '>';
    }

/**
 * Destructor, used to free resources.
 *
 * @access private
 */
    function __destruct() {
        if (is_resource($this->__parser)) {
            xml_parser_free($this->__parser);
        }
    }
/**
 * Adds a namespace to any XML documents generated or parsed
 *
 * @param  string  $name The namespace name
 * @param  string  $url  The namespace URI; can be empty if in the default namespace map
 * @return boolean False if no URL is specified, and the namespace does not exist
 *                 default namespace map, otherwise true
 * @access public
 * @static
 */
    function addGlobalNs($name, $url = null) {
        $_this =& XmlManager::getInstance();
        if ($ns = Xml::resolveNamespace($name, $url)) {
            $_this->namespaces = array_merge($_this->namespaces, $ns);
            return $ns;
        }
        return false;
    }
/**
 * Resolves current namespace
 *
 * @param  string  $name
 * @param  string  $url
 * @return array
 */
    function resolveNamespace($name, $url) {
        $_this =& XmlManager::getInstance();
        if ($url == null && isset($_this->defaultNamespaceMap[$name])) {
            $url = $_this->defaultNamespaceMap[$name];
        } elseif ($url == null) {
            return false;
        }

        if (!strpos($url, '://') && isset($_this->defaultNamespaceMap[$name])) {
            $_url = $_this->defaultNamespaceMap[$name];
            $name = $url;
            $url = $_url;
        }
        return array($name => $url);
    }
/**
 * Alias to Xml::addNs
 *
 * @access public
 * @static
 */
    function addGlobalNamespace($name, $url = null) {
        return Xml::addGlobalNs($name, $url);
    }
/**
 * Removes a namespace added in addNs()
 *
 * @param  string  $name The namespace name or URI
 * @access public
 * @static
 */
    function removeGlobalNs($name) {
        $_this =& XmlManager::getInstance();
        if (isset($_this->namespaces[$name])) {
            unset($_this->namespaces[$name]);
            unset($this->namespaces[$name]);
            return true;
        } elseif (in_array($name, $_this->namespaces)) {
            $keys = array_keys($_this->namespaces);
            $count = count($keys);
            for ($i = 0; $i < $count; $i++) {
                if ($_this->namespaces[$keys[$i]] == $name) {
                    unset($_this->namespaces[$keys[$i]]);
                    unset($this->namespaces[$keys[$i]]);
                    return true;
                }
            }
        }
        return false;
    }
/**
 * Alias to Xml::removeNs
 *
 * @access public
 * @static
 */
    function removeGlobalNamespace($name) {
        return Xml::removeGlobalNs($name);
    }
/**
 * Sets/gets global XML options
 *
 * @param array $options
 * @return array
 * @access public
 * @static
 */
    function options($options = array()) {
        $_this =& XmlManager::getInstance();
        $_this->options = array_merge($_this->options, $options);
        return $_this->options;
    }
}
/**
 * The XML Element
 *
 */
class XmlElement extends XmlNode {
/**
 * Construct an Xml element
 *
 * @param  string  $name name of the node
 * @param  string  $value value of the node
 * @param  array  $attributes
 * @param  string  $namespace
 * @return string A copy of $data in XML format
 */
    function __construct($name = null, $value = null, $attributes = array(), $namespace = false) {
        parent::__construct($name, $value, $namespace);
        $this->addAttribute($attributes);
    }
/**
 * Get all the attributes for this element
 *
 * @return array
 */
    function attributes() {
        return $this->attributes;
    }
/**
 * Add attributes to this element
 *
 * @param  string  $name name of the node
 * @param  string  $value value of the node
 * @return boolean
 */
    function addAttribute($name, $val = null) {
        if (is_object($name)) {
            $name = get_object_vars($name);
        }
        if (is_array($name)) {
            foreach ($name as $key => $val) {
                $this->addAttribute($key, $val);
            }
            return true;
        }
        if (is_numeric($name)) {
            $name = $val;
            $val = null;
        }
        if (!empty($name)) {
            if (strpos($name, 'xmlns') === 0) {
                if ($name == 'xmlns') {
                    $this->namespace = $val;
                } else {
                    list($pre, $prefix) = explode(':', $name);
                    $this->addNamespace($prefix, $val);
                    return true;
                }
            }
            $this->attributes[$name] = $val;
            return true;
        }
        return false;
    }
/**
 * Remove attributes to this element
 *
 * @param  string  $name name of the node
 * @return boolean
 */
    function removeAttribute($attr) {
        if (array_key_exists($attr, $this->attributes)) {
            unset($this->attributes[$attr]);
            return true;
        }
        return false;
    }
}

/**
 * XML text or CDATA node
 *
 * Stores XML text data according to the encoding of the parent document
 *
 * @package       cake
 * @subpackage    cake.cake.libs
 * @since         CakePHP v .1.2.6000
 */
class XmlTextNode extends XmlNode {
/**
 * Harcoded XML node name, represents this object as a text node
 *
 * @var string
 */
    var $name = '#text';
/**
 * The text/data value which this node contains
 *
 * @var string
 */
    var $value = null;
/**
 * Construct text node with the given parent object and data
 *
 * @param object $parent Parent XmlNode/XmlElement object
 * @param mixed $value Node value
 */
    function __construct($value = null) {
        $this->value = $value;
    }
/**
 * Looks for child nodes in this element
 *
 * @return boolean False - not supported
 */
    function hasChildren() {
        return false;
    }
/**
 * Append an XML node: XmlTextNode does not support this operation
 *
 * @return boolean False - not supported
 * @todo make convertEntities work without mb support, convert entities to number entities
 */
    function append() {
        return false;
    }
/**
 * Return string representation of current text node object.
 *
 * @return string String representation
 * @access public
 */
    function toString($options = array(), $depth = 0) {
        if (is_int($options)) {
            $depth = $options;
            $options = array();
        }

        $defaults = array('cdata' => true, 'whitespace' => false, 'convertEntities' => false);
        $options = array_merge($defaults, Xml::options(), $options);
        $val = $this->value;

        if ($options['convertEntities'] && function_exists('mb_convert_encoding')) {
            $val = mb_convert_encoding($val,'UTF-8', 'HTML-ENTITIES');
        }

        if ($options['cdata'] === true && !is_numeric($val)) {
            $val = '<![CDATA[' . $val . ']]>';
        }

        if ($options['whitespace']) {
            return str_repeat("\t", $depth) . $val . "\n";
        }
        return $val;
    }
}
/**
 * Manages application-wide namespaces and XML parsing/generation settings.
 * Private class, used exclusively within scope of XML class.
 *
 * @access private
 */
class XmlManager {

/**
 * Global XML namespaces.  Used in all XML documents processed by this application
 *
 * @var array
 * @access public
 */
    var $namespaces = array();
/**
 * Global XML document parsing/generation settings.
 *
 * @var array
 * @access public
 */
    var $options = array();
/**
 * Map of common namespace URIs
 *
 * @access private
 * @var array
 */
    var $defaultNamespaceMap = array(
        'dc'     => 'http://purl.org/dc/elements/1.1/',                 // Dublin Core
        'dct'    => 'http://purl.org/dc/terms/',                        // Dublin Core Terms
        'g'         => 'http://base.google.com/ns/1.0',                 // Google Base
        'rc'        => 'http://purl.org/rss/1.0/modules/content/',      // RSS 1.0 Content Module
        'wf'        => 'http://wellformedweb.org/CommentAPI/',          // Well-Formed Web Comment API
        'fb'        => 'http://rssnamespace.org/feedburner/ext/1.0',    // FeedBurner extensions
        'lj'        => 'http://www.livejournal.org/rss/lj/1.0/',        // Live Journal
        'itunes'    => 'http://www.itunes.com/dtds/podcast-1.0.dtd',    // iTunes
        'xhtml'     => 'http://www.w3.org/1999/xhtml',                  // XHTML,
        'atom'      => 'http://www.w3.org/2005/Atom'                    // Atom
    );
/**
 * Returns a reference to the global XML object that manages app-wide XML settings
 *
 * @return object
 * @access public
 */
    function &getInstance() {
        static $instance = array();

        if (!$instance) {
            $instance[0] =& new XmlManager();
        }
        return $instance[0];
    }
}
?>

---