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<?php
/**
* @version $Id: simplexml.php 14401 2010-01-26 14:10:00Z louis $
* @package Joomla.Framework
* @subpackage Utilities
* @copyright Copyright (C) 2005 - 2010 Open Source Matters. All rights reserved.
* @license GNU/GPL, see LICENSE.php
* Joomla! is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
* See COPYRIGHT.php for copyright notices and details.
*/
// Check to ensure this file is within the rest of the framework
defined('JPATH_BASE') or die();
/**
* SimpleXML implementation.
*
* The XML Parser extension (expat) is required to use JSimpleXML.
*
* The class provides a pure PHP4 implementation of the PHP5
* interface SimpleXML. As with PHP5's SimpleXML it is what it says:
* simple. Nevertheless, it is an easy way to deal with XML data,
* especially for read only access.
*
* Because it's not possible to use the PHP5 ArrayIterator interface
* with PHP4 there are some differences between this implementation
* and that of PHP5:
*
* <ul>
* <li>The access to the root node has to be explicit in
* JSimpleXML, not implicit as with PHP5. Write
* $xml->document->node instead of $xml->node</li>
* <li>You cannot acces CDATA using array syntax. Use the method data() instead</li>
* <li>You cannot access attributes directly with array syntax. use attributes()
* to read them.</li>
* <li>Comments are ignored.</li>
* <li>Last and least, this is not as fast as PHP5 SimpleXML--it is pure PHP4.</li>
* </ul>
*
* Example:
* <code>
* :simple.xml:
* <?xml version="1.0" encoding="utf-8" standalone="yes"?>
* <document>
* <node>
* <child gender="m">Tom Foo</child>
* <child gender="f">Tamara Bar</child>
* <node>
* </document>
*
* ---
*
* // read and write a document
* $xml = new JSimpleXML;
* $xml->loadFile('simple.xml');
* print $xml->document->toString();
*
* // access a given node's CDATA
* print $xml->root->node->child[0]->data(); // Tom Foo
*
* // access attributes
* $attr = $xml->root->node->child[1]->attributes();
* print $attr['gender']; // f
*
* // access children
* foreach( $xml->root->node->children() as $child ) {
* print $child->data();
* }
* </code>
*
* Note: JSimpleXML cannot be used to access sophisticated XML doctypes
* using datatype ANY (e.g. XHTML). With a DOM implementation you can
* handle this.
*
* @package Joomla.Framework
* @subpackage Utilities
* @since 1.5
*/
class JSimpleXML extends JObject
{
/**
* The XML parser
*
* @var resource
*/
var $_parser = null;
/**
* The XML document
*
* @var string
*/
var $_xml = '';
/**
* Document element
*
* @var object
*/
var $document = null;
/**
* Current object depth
*
* @var array
*/
var $_stack = array();
/**
* Constructor.
*
* @access protected
*/
function __construct($options = null)
{
if(! function_exists('xml_parser_create')) {
return false; //TODO throw warning
}
//Create the parser resource and make sure both versions of PHP autodetect the format.
$this->_parser = xml_parser_create('');
// check parser resource
xml_set_object($this->_parser, $this);
xml_parser_set_option($this->_parser, XML_OPTION_CASE_FOLDING, 0);
if( is_array($options) )
{
foreach( $options as $option => $value ) {
xml_parser_set_option($this->_parser, $option, $value);
}
}
//Set the handlers
xml_set_element_handler($this->_parser, '_startElement', '_endElement');
xml_set_character_data_handler($this->_parser, '_characterData');
}
/**
* Interprets a string of XML into an object
*
* This function will take the well-formed xml string data and return an object of class
* JSimpleXMLElement with properties containing the data held within the xml document.
* If any errors occur, it returns FALSE.
*
* @param string Well-formed xml string data
* @param string currently ignored
* @return object JSimpleXMLElement
*/
function loadString($string, $classname = null) {
$this->_parse($string);
return true;
}
/**
* Interprets an XML file into an object
*
* This function will convert the well-formed XML document in the file specified by filename
* to an object of class JSimpleXMLElement. If any errors occur during file access or
* interpretation, the function returns FALSE.
*
* @param string Path to xml file containing a well-formed XML document
* @param string currently ignored
* @return boolean True if successful, false if file empty
*/
function loadFile($path, $classname = null)
{
//Check to see of the path exists
if ( !file_exists( $path ) ) {
return false;
}
//Get the XML document loaded into a variable
$xml = trim( file_get_contents($path) );
if ($xml == '')
{
return false;
}
else
{
$this->_parse($xml);
return true;
}
}
/**
* Get a JSimpleXMLElement object from a DOM node.
*
* This function takes a node of a DOM document and makes it into a JSimpleXML node.
* This new object can then be used as a native JSimpleXML element. If any errors occur,
* it returns FALSE.
*
* @param string DOM document
* @param string currently ignored
* @return object JSimpleXMLElement
*/
function importDOM($node, $classname = null) {
return false;
}
/**
* Get the parser
*
* @access public
* @return resource XML parser resource handle
*/
function getParser() {
return $this->_parser;
}
/**
* Set the parser
*
* @access public
* @param resource XML parser resource handle
*/
function setParser($parser) {
$this->_parser = $parser;
}
/**
* Start parsing an XML document
*
* Parses an XML document. The handlers for the configured events are called as many times as necessary.
*
* @param $xml string data to parse
*/
function _parse($data = '')
{
//Error handling
if (!xml_parse($this->_parser, $data)) {
$this->_handleError(
xml_get_error_code($this->_parser),
xml_get_current_line_number($this->_parser),
xml_get_current_column_number($this->_parser)
);
}
//Free the parser
xml_parser_free($this->_parser);
}
/**
* Handles an XML parsing error
*
* @access protected
* @param int $code XML Error Code
* @param int $line Line on which the error happened
* @param int $col Column on which the error happened
*/
function _handleError($code, $line, $col)
{
JError::raiseWarning( 'SOME_ERROR_CODE' , 'XML Parsing Error at '.$line.':'.$col.'. Error '.$code.': '.xml_error_string($code));
}
/**
* Gets the reference to the current direct parent
*
* @return object
*/
function _getStackLocation()
{
$return = '';
foreach($this->_stack as $stack) {
$return .= $stack.'->';
}
return rtrim($return, '->');
}
/**
* Handler function for the start of a tag
*
* @access protected
* @param resource $parser
* @param string $name
* @param array $attrs
*/
function _startElement($parser, $name, $attrs = array())
{
//Check to see if tag is root-level
$count = count($this->_stack);
if ($count == 0)
{
//If so, set the document as the current tag
$classname = get_class( $this ) . 'Element';
$this->document = new $classname($name, $attrs);
//And start out the stack with the document tag
$this->_stack = array('document');
}
//If it isn't root level, use the stack to find the parent
else
{
//Get the name which points to the current direct parent, relative to $this
$parent = $this->_getStackLocation();
//Add the child
eval('$this->'.$parent.'->addChild($name, $attrs, '.$count.');');
//Update the stack
eval('$this->_stack[] = $name.\'[\'.(count($this->'.$parent.'->'.$name.') - 1).\']\';');
}
}
/**
* Handler function for the end of a tag
*
* @access protected
* @param resource $parser
* @param string $name
*/
function _endElement($parser, $name)
{
//Update stack by removing the end value from it as the parent
array_pop($this->_stack);
}
/**
* Handler function for the character data within a tag
*
* @access protected
* @param resource $parser
* @param string $data
*/
function _characterData($parser, $data)
{
//Get the reference to the current parent object
$tag = $this->_getStackLocation();
//Assign data to it
eval('$this->'.$tag.'->_data .= $data;');
}
}
/**
* SimpleXML Element
*
* This object stores all of the direct children of itself in the $children array.
* They are also stored by type as arrays. So, if, for example, this tag had 2 <font>
* tags as children, there would be a class member called $font created as an array.
* $font[0] would be the first font tag, and $font[1] would be the second.
*
* To loop through all of the direct children of this object, the $children member
* should be used.
*
* To loop through all of the direct children of a specific tag for this object, it
* is probably easier to use the arrays of the specific tag names, as explained above.
*
* @package Joomla.Framework
* @subpackage Utilities
* @since 1.5
*/
class JSimpleXMLElement extends JObject
{
/**
* Array with the attributes of this XML element
*
* @var array
*/
var $_attributes = array();
/**
* The name of the element
*
* @var string
*/
var $_name = '';
/**
* The data the element contains
*
* @var string
*/
var $_data = '';
/**
* Array of references to the objects of all direct children of this XML object
*
* @var array
*/
var $_children = array();
/**
* The level of this XML element
*
* @var int
*/
var $_level = 0;
/**
* Constructor, sets up all the default values
*
* @param string $name
* @param array $attrs
* @param int $parents
* @return JSimpleXMLElement
*/
function __construct($name, $attrs = array(), $level = 0)
{
//Make the keys of the attr array lower case, and store the value
$this->_attributes = array_change_key_case($attrs, CASE_LOWER);
//Make the name lower case and store the value
$this->_name = strtolower($name);
//Set the level
$this->_level = $level;
}
/**
* Get the name of the element
*
* @access public
* @return string
*/
function name() {
return $this->_name;
}
/**
* Get the an attribute of the element
*
* @param string $attribute The name of the attribute
*
* @access public
* @return mixed If an attribute is given will return the attribute if it exist.
* If no attribute is given will return the complete attributes array
*/
function attributes($attribute = null)
{
if(!isset($attribute)) {
return $this->_attributes;
}
return isset($this->_attributes[$attribute]) ? $this->_attributes[$attribute] : null;
}
/**
* Get the data of the element
*
* @access public
* @return string
*/
function data() {
return $this->_data;
}
/**
* Set the data of the element
*
* @access public
* @param string $data
* @return string
*/
function setData($data) {
$this->_data = $data;
}
/**
* Get the children of the element
*
* @access public
* @return array
*/
function children() {
return $this->_children;
}
/**
* Get the level of the element
*
* @access public
* @return int
*/
function level() {
return $this->_level;
}
/**
* Adds an attribute to the element
*
* @param string $name
* @param array $attrs
*/
function addAttribute($name, $value)
{
//add the attribute to the element, override if it already exists
$this->_attributes[$name] = $value;
}
/**
* Removes an attribute from the element
*
* @param string $name
*/
function removeAttribute($name)
{
unset($this->_attributes[$name]);
}
/**
* Adds a direct child to the element
*
* @param string $name
* @param array $attrs
* @param int $level
* @return JSimpleXMLElement The added child object
*/
function &addChild($name, $attrs = array(), $level = null)
{
//If there is no array already set for the tag name being added,
//create an empty array for it
if(!isset($this->$name)) {
$this->$name = array();
}
// set the level if not already specified
if ($level == null) {
$level = ($this->_level + 1);
}
//Create the child object itself
$classname = get_class( $this );
$child = new $classname( $name, $attrs, $level );
//Add the reference of it to the end of an array member named for the elements name
$this->{$name}[] =& $child;
//Add the reference to the children array member
$this->_children[] =& $child;
//return the new child
return $child;
}
function removeChild(&$child)
{
$name = $child->name();
for ($i=0,$n=count($this->_children);$i<$n;$i++)
{
if ($this->_children[$i] == $child) {
unset($this->_children[$i]);
}
}
for ($i=0,$n=count($this->{$name});$i<$n;$i++)
{
if ($this->{$name}[$i] == $child) {
unset($this->{$name}[$i]);
}
}
$this->_children = array_values($this->_children);
$this->{$name} = array_values($this->{$name});
unset($child);
}
/**
* Get an element in the document by / separated path
*
* @param string $path The / separated path to the element
* @return object JSimpleXMLElement
*/
function &getElementByPath($path)
{
$tmp =& $this;
$false = false;
$parts = explode('/', trim($path, '/'));
foreach ($parts as $node)
{
$found = false;
foreach ($tmp->_children as $child)
{
if ($child->_name == $node)
{
$tmp =& $child;
$found = true;
break;
}
}
if (!$found) {
break;
}
}
if ($found) {
$ref =& $tmp;
} else {
$ref =& $false;
}
return $ref;
}
/**
* traverses the tree calling the $callback( JSimpleXMLElement
* $this, mixed $args=array() ) function with each JSimpleXMLElement.
*
* @param string $callback function name
* @param array $args
*/
function map($callback, $args=array())
{
$callback($this, $args);
// Map to all children
if ($n = count($this->_children)) {
for($i=0;$i<$n;$i++)
{
$this->_children[$i]->map($callback, $args);
}
}
}
/**
* Return a well-formed XML string based on SimpleXML element
*
* @return string
*/
function toString($whitespace=true)
{
//Start a new line, indent by the number indicated in $this->level, add a <, and add the name of the tag
if ($whitespace) {
$out = "\n".str_repeat("\t", $this->_level).'<'.$this->_name;
} else {
$out = '<'.$this->_name;
}
//For each attribute, add attr="value"
foreach($this->_attributes as $attr => $value) {
$out .= ' '.$attr.'="'.htmlspecialchars($value).'"';
}
//If there are no children and it contains no data, end it off with a />
if (empty($this->_children) && empty($this->_data)) {
$out .= " />";
}
else //Otherwise...
{
//If there are children
if(!empty($this->_children))
{
//Close off the start tag
$out .= '>';
//For each child, call the asXML function (this will ensure that all children are added recursively)
foreach($this->_children as $child)
$out .= $child->toString($whitespace);
//Add the newline and indentation to go along with the close tag
if ($whitespace) {
$out .= "\n".str_repeat("\t", $this->_level);
}
}
//If there is data, close off the start tag and add the data
elseif(!empty($this->_data))
$out .= '>'.htmlspecialchars($this->_data);
//Add the end tag
$out .= '</'.$this->_name.'>';
}
//Return the final output
return $out;
}
}