<?php

/**
 * Project: 
 * Contenido Content Management System
 * 
 * Description: 
 * XmlTree and XmlNode Class
 * 
 * Requirements: 
 * @con_php_req 5.0
 * 
 *
 * @package    Contenido_XML
 * @version    1.0.1
 * @author     Jan Lengowski
 * @copyright  four for business AG <www.4fb.de>
 * @license    http://www.contenido.org/license/LIZENZ.txt
 * @link       http://www.4fb.de
 * @link       http://www.contenido.org
 * @since      file available since contenido release <= 4.6
 * 
 * {@internal 
 *   created unknown
 *   modified 2008-06-30, Dominik Ziegler, add security fix
 *   modified 2010-07-03, Ortwin Pinke, removed '=&', causes deprecated runtime error with PHP >= 5.3
 *
 *   $Id$:
 * }}
 * 
 */
if (!defined('CON_FRAMEWORK')) {
    die('Illegal call');
}

/**
 * XmlTree class
 *
 * Class to create XML tree structures from
 * scratch without the need for a XML DOM
 *
 * Example:
 *
 * !! Attention, using '=&' is deprecated in PHP >= 5.3 and causes a deprecated runtime error
 * don't use it any more (Ortwin Pinke, 2010-07-03
 *
 * $tree  = new XmlTree('1.0', 'ISO-8859-1');
 * $root =& $tree->addRoot('rootname', 'some content', array('foo'=>'bar')); 
 * 
 * This genererates following XML:
 * 
 * <?xml version="1.0" encoding="ISO-8859-1"?>
 * <rootname foo="bar">some content</rootname>
 *
 * $root now references the 'rootname' node object.
 * To append childNodes use the appendChild method.
 *
 * $foo =& $root->appendChild('foo', 'bar');
 *
 * Note: From version 1.1 you can use the $obj->add() method
 * as shortcut to appendchild
 *
 * <?xml version="1.0" encoding="ISO-8859-1"?>
 * <rootname foo="bar">some content<foo>bar</foo></rootname>
 *
 * !! ALWAYS use '=&' with the addRoot and appendChild methods. !!
 *
 */
class XmlTree {

    /**
     * XML Version string
     * @var string
     * @access private	
     */
    var $_strXmlVersion;

    /**
     * XML Encoding string
     * @var string
     * @access private	
     */
    var $_strXmlEncoding;

    /**
     * Root element name
     * @var string
     * @access private	
     */
    var $_strRootName;

    /**
     * Root content
     * @var string
     * @access private	
     */
    var $_strRootContent;

    /**
     * Root attributes
     * @var array
     * @access private	
     */
    var $_strRootAttribs;

    /**
     * Root node 
     * @var object
     * @access private	
     */
    var $_objRoot;

    /**
     * Tree XML string
     * @var string
     * @access private	
     */
    var $_strXml;

    /**
     * Indent character
     * @var string
     * @access private	
     */
    var $_indentChar = "";

    /**
     * Constructor
     *
     * @param string XML Version i.e. "1.0"
     * @param string XML Encoding i.e. "UTF-8" 
     *
     * @return void	
     */
    function __construct($strXmlVersion = '1.0', $strXmlEncoding = 'UTF-8') {
        $this->_strXmlVersion = 'version="' . $strXmlVersion . '"';
        $this->_strXmlEncoding = 'encoding="' . $strXmlEncoding . '"';
    }

    /**
     * Add a Root element to the XML Tree
     *
     * @param string XML Node Name 
     * @param string XML Node Content 
     * @param array Attributes array('name'=>'value')
     *
     * @return object Reference to the root node object
     */
    function &addRoot($strNodeName, $strNodeContent = '', $arrNodeAttribs = array()) {
        if (!$strNodeName) {
            return 'XmlTree::addRoot() -> No node name specified';
        }

        $this->_objRoot = new XmlNode($strNodeName, $strNodeContent, $arrNodeAttribs);
        return $this->_objRoot;
    }

    /**
     * Print or Return Tree XML
     *
     * @param boolean Return content 
     *
     * @return string Tree XML
     */
    function dump($bolReturn = false) {
        if (!is_object($this->_objRoot)) {
            return 'XmlTree::dump() -> There is no root node';
        }

        $this->_objRoot->setIndent($this->_indentChar);
        $this->_strXml = sprintf("<?xml %s %s?>\n", $this->_strXmlVersion, $this->_strXmlEncoding);
        $this->_strXml .= $this->_objRoot->toXml();

        if ($bolReturn) {
            return $this->_strXml;
        }

        echo $this->_strXml;
    }

    /**
     * Set the indent string
     * @param int level
     * @return void
     */
    function setIndent($string) {
        $this->_indentChar = $string;
    }

}

// XmlTree

/**
 * XmlNode Object
 *
 * Object of a XML Tree Node
 *
 * @see XmlTree
 *
 * !! ALWAYS use '=&' with the addRoot and appendChild methods. !!
 *
 */
class XmlNode {

    /**
     * Indenting character
     * @var string
     */
    var $_indentChar;

    /**
     * Node name 
     * @var string
     * @access private
     */
    var $_strNodeName;

    /**
     * Node content 
     * @var string
     * @access private
     */
    var $_strNodeContent;

    /**
     * Added content 
     * @var string
     * @access private
     */
    var $_strNodeContentAdded;

    /**
     * Node attributes 
     * @var array
     * @access private
     */
    var $_arrNodeAttribs;

    /**
     * Enclose node content in a cdata section 
     * @var boolean
     * @access private
     */
    var $_cdata;

    /**
     * XML for this node 
     * @var string
     * @access private
     */
    var $_strXml;

    /**
     * Child count  
     * @var int
     * @access private
     */
    var $_intChildCount = 0;

    /**
     * Parent Node 
     * @var object	
     */
    var $parentNode = 0;

    /**
     * Childnodes 
     * @var array
     * @access private
     */
    var $childNodes = array();

    /**
     * Class Constructor
     *
     * @param string XML Node Name 
     * @param string XML Node Content 
     * @param array Attributes array('name'=>'value')
     *
     * @return void	
     */
    function __construct($strNodeName, $strNodeContent = '', $arrNodeAttribs = array(), $cdata = false) {
        if (!$strNodeName) {
            return $this->_throwError($this, '%s::Construtctor() : No node name specified.');
        }

        $this->_cdata = $cdata;

        $this->setNodeName($strNodeName);
        $this->setNodeContent($strNodeContent);
        $this->setNodeAttribs($arrNodeAttribs);
    }

    /**
     * Set a node name
     *
     * @param string Node name 
     *
     * @return void	
     */
    function setNodeName($strNodeName) {
        $this->_strNodeName = $strNodeName;
    }

    /**
     * Set node content
     *
     * @param string Node content 
     *
     * @return void	
     */
    function setNodeContent($strNodeContent) {
        $this->_strNodeContent = $strNodeContent;
    }

    /**
     * Set the node attributes
     *
     * @param array Node attributes array('name'=>'value') 
     *
     * @return void	
     */
    function setNodeAttribs($arrNodeAttribs) {
        $this->_arrNodeAttribs = $arrNodeAttribs;
    }

    /**
     * Set the node parent
     *
     * @param object Reference to the parent object 
     *
     * @return void	
     */
    function setNodeParent(&$objParent) {
        $this->parentNode = $objParent;
    }

    /**
     * Add content to the node
     *
     * @param string Content 
     *
     * @return void	
     */
    function addNodeContent($strNodeContent) {
        $this->_strNodeContentAdded = $strNodeContent;
    }

    /**
     * Check if the node has childs
     *
     * @return boolean 	
     */
    function hasChilds() {
        return ($this->_intChildCount > 0) ? true : false;
    }

    /**
     * Add a child child node 
     *
     * @param string XML Node Name 
     * @param string XML Node Content 
     * @param array Attributes array('name'=>'value')
     * @param bool CDATA Section
     *
     * @return object Reference to the new node object
     */
    function &appendChild($strNodeName, $strNodeContent = '', $arrNodeAttribs = array(), $cdata = false) {
        if (!$strNodeName) {
            return $this->_throwError($this, '%s::appendChild() : No node name specified');
        }

        $pos = $this->_intChildCount ++;

        $this->childNodes[$pos] = new XmlNode($strNodeName, $strNodeContent, $arrNodeAttribs, $cdata);
        $this->childNodes[$pos]->setNodeParent($this);

        return $this->childNodes[$pos];
    }

    /**
     * Short for appendChild method 
     *
     * @see appendChild
     */
    function &add($strNodeName, $strNodeContent = '', $arrNodeAttribs = array(), $cdata = false) {
        return $this->appendChild($strNodeName, $strNodeContent, $arrNodeAttribs, $cdata);
    }

    /**
     * Builds the XML string for the node using the
     * node properties 
     *
     * @return string XML String
     * @access private
     */
    function toXml($indent = 0) {
        // Indent for nodes markub
        $sp = $this->_getIndent($indent);

        // Indent for content
        $csp = $this->_getIndent($indent ++);

        // Increment indent
        //$indent ++;

        $this->_strXml = "$sp<" . $this->_strNodeName . $this->_parseAttributes($this->_arrNodeAttribs);

        $maxNodes = count($this->childNodes);

        if ($this->_strNodeContent != '' || $this->_strNodeContentAdded != '' || $maxNodes > 0) {
            $this->_strXml .= ">";

            if ($this->_cdata) {
                $this->_strXml .= "$csp<![CDATA[ ";

                $content = $this->_strNodeContent . $this->_strNodeContentAdded;
                $this->_strXml .= $content;
            } else {
                $content = $this->_strNodeContent . $this->_strNodeContentAdded;
                $this->_strXml .= ($content != "") ? "$content" : $content;
            }

            if ($this->_cdata) {
                $this->_strXml .= " ]]>";
            }

            for ($i = 0; $i < $maxNodes; $i++) {
                $this->childNodes[$i]->setIndent($this->_indentChar);
                $this->_strXml .= $this->childNodes[$i]->toXml($indent);
            }

            $this->_strXml .= "$sp</" . $this->_strNodeName . ">\n";
        } else {
            $this->_strXml .= "/>\n";
        }

        return $this->_strXml;
    }

    /**
     * Builds a string from the attributes array 
     *
     * @param array Attributes array('name'=>'value')
     *
     * @return string Attribute string
     * @access private
     */
    function _parseAttributes($arrAttributes = array()) {
        $strAttributes = '';

        if (is_array($arrAttributes)) {
            foreach ($arrAttributes as $name => $value) {
                $strAttributes .= ' ' . $name . '="' . $value . '"';
            }
        }

        return $strAttributes;
    }

    /**
     * Get indent string
     * @param int level
     * @return string indent string
     */
    function _getIndent($level) {
        return $this->_strXml .= str_repeat($this->_indentChar, $level);
    }

    /**
     * Set the indent string
     * @param int level
     * @return void
     */
    function setIndent($string = "") {
        $this->_indentChar = $string;
    }

}