xml_domit_xpath.php

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			$total = $contextNode->childCount;
			$nodeCounter = 0;

			for ($i = 0; $i < $total; $i++) {
				$currChildNode =& $contextNode->childNodes[$i];

				if ($currChildNode->nodeName == $nodeName) {
					$nodeCounter++;

					if ($nodeCounter == $index) {
						$this->localNodeContainer[] =& $currChildNode;
					}
				}

				if ($deep) {
					$this->_filterByIndex($currChildNode, $nodeName, $index, $deep);
				}
			}
		}
	} //_filterByIndex

	/**
	* Selects named elements with the specified named child
	* @param string The pattern segment containing the node expression
	* @param string The tag name of the matching child
	* @param boolean True if the selection is to be performed recursively
	*/
	function filterByChildName($nodeName, $childName, $deep) {
		if (count($this->globalNodeContainer) != 0) {
			foreach ($this->globalNodeContainer as $key =>$value) {
				$currNode =& $this->globalNodeContainer[$key];
				$this->_filterByChildName($currNode, $nodeName, $childName, $deep);
			}
		}
	} //filterByChildName

	/**
	* Selects named elements with the specified named child
	* @param object The context node
	* @param string The pattern segment containing the node expression
	* @param string The tag name of the matching child
	* @param boolean True if the selection is to be performed recursively
	*/
	function _filterByChildName(&$contextNode, $nodeName, $childName, $deep) {
		if (($contextNode->nodeType == DOMIT_ELEMENT_NODE) ||
			($contextNode->nodeType == DOMIT_DOCUMENT_NODE)) {
			$total = $contextNode->childCount;

			for ($i = 0; $i < $total; $i++) {
				$currChildNode =& $contextNode->childNodes[$i];

				if (($currChildNode->nodeName == $nodeName) &&
					($currChildNode->nodeType == DOMIT_ELEMENT_NODE)) {
					$total2 = $currChildNode->childCount;

					for ($j = 0; $j < $total2; $j++) {
						$currChildChildNode =& $currChildNode->childNodes[$j];

						if ($currChildChildNode->nodeName == $childName) {
							$this->localNodeContainer[] =& $currChildNode;
						}
					}
				}

				if ($deep) {
					$this->_filterByChildName($currChildNode, $nodeName, $childName, $deep);
				}
			}
		}
	} //_filterByChildName

	/**
	* Selects named attributes of the current context nodes
	* @param string The attribute name, or * to match all attributes
	*/
	function selectAttribute($attrName) {
		if (count($this->globalNodeContainer) != 0) {
			foreach ($this->globalNodeContainer as $key =>$value) {
				$currNode =& $this->globalNodeContainer[$key];

				$isRecursive = ($this->searchType == DOMIT_XPATH_SEARCH_VARIABLE) ? true : false;
				$this->_selectAttribute($currNode, $attrName, $isRecursive);
			}
		}

		$this->charContainer = '';
	} //selectAttribute

	/**
	* Selects all attributes of the context nodes
	* @param object The context node
	* @param string The attribute name, or * to match all attributes
	* @param boolean True if the selection is to be performed recursively
	*/
	function _selectAttribute(&$contextNode, $attrName, $deep) {
		if (($contextNode->nodeType == DOMIT_ELEMENT_NODE) ||
				($contextNode->nodeType == DOMIT_DOCUMENT_NODE)) {
			$total = $contextNode->childCount;

			for ($i = 0; $i < $total; $i++) {
				$currNode =& $contextNode->childNodes[$i];

				if ($currNode->nodeType == DOMIT_ELEMENT_NODE) {
					if ($attrName == '*') {
						$total2 = $currNode->attributes->getLength();

						for ($j = 0; $j < $total2; $j++) {
							$this->localNodeContainer[] =& $currNode->attributes->item($j);
						}
					}
					else {
						if ($currNode->hasAttribute($attrName)) {
							$this->localNodeContainer[] =& $currNode->getAttributeNode($attrName);
						}
					}
				}

				if ($deep) {
					$this->_selectAttribute($currNode, $attrName, $deep);
				}
			}
		}
	} //_selectAttribute


	/**
	* Selects all child nodes of the current context nodes
	* @param string The element name
	*/
	function selectNamedChild($tagName) {
		if (count($this->globalNodeContainer) != 0) {
			foreach ($this->globalNodeContainer as $key =>$value) {
				$currNode =& $this->globalNodeContainer[$key];

				$isRecursive = ($this->searchType == DOMIT_XPATH_SEARCH_VARIABLE) ? true : false;
				$this->_selectNamedChild($currNode, $tagName, $isRecursive);
			}
		}

		$this->charContainer = '';
	} //selectNamedChild

	/**
	* Selects all child nodes of the context node
	* @param object The context node
	* @param string The element name
	* @param boolean True if the selection is to be performed recursively
	*/
	function _selectNamedChild(&$contextNode, $tagName, $deep = false) {
		if (($contextNode->nodeType == DOMIT_ELEMENT_NODE) ||
			($contextNode->nodeType == DOMIT_DOCUMENT_NODE)) {
			$total = $contextNode->childCount;

			for ($i = 0; $i < $total; $i++) {
				$currChildNode =& $contextNode->childNodes[$i];

				if (($currChildNode->nodeType == DOMIT_ELEMENT_NODE) ||
					($currChildNode->nodeType == DOMIT_DOCUMENT_NODE)) {
					if (($tagName == '*') || ($tagName == $currChildNode->nodeName)) {
						$this->localNodeContainer[] =& $currChildNode;
					}

					if ($deep) {
						$this->_selectNamedChild($currChildNode, $tagName, $deep);
					}
				}
			}
		}
	} //_selectNamedChild

	/**
	* Selects parent node of the current context nodes
	*/
	function selectParent() {
		if (count($this->globalNodeContainer) != 0) {
			foreach ($this->globalNodeContainer as $key =>$value) {
				$currNode =& $this->globalNodeContainer[$key];

				$isRecursive = ($this->searchType == DOMIT_XPATH_SEARCH_VARIABLE) ? true : false;
				$this->_selectParent($currNode, $isRecursive);
			}
		}

		$this->charContainer = '';
	} //selectParent

	/**
	* Selects parent node of the current context nodes
	* @param object The context node
	* @param boolean True if the selection is to be performed recursively
	*/
	function _selectParent(&$contextNode, $deep = false) {
		if ($contextNode->nodeType == DOMIT_ELEMENT_NODE) {
			if ($contextNode->parentNode != null) {
				$this->localNodeContainer[] =& $contextNode->parentNode;
			}
		}

		if ($deep) {
			if (($contextNode->nodeType == DOMIT_ELEMENT_NODE) ||
				($contextNode->nodeType == DOMIT_DOCUMENT_NODE)) {
				$total = $contextNode->childCount;

				for ($i = 0; $i < $total; $i++) {
					$currNode =& $contextNode->childNodes[$i];

					if ($currNode->nodeType == DOMIT_ELEMENT_NODE) {
						$this->_selectParent($contextNode, $deep);
					}
				}
			}
		}
	} //_selectParent

	/**
	* Selects any nodes of the current context nodes which match the given function
	*/
	function selectNodesByFunction() {
		$doProcess = false;
		$targetNodeType = -1;

		switch (strtolower(trim($this->charContainer))) {
			case 'last()':
				if (count($this->globalNodeContainer) != 0) {
					foreach ($this->globalNodeContainer as $key =>$value) {
						$currNode =& $this->globalNodeContainer[$key];

						if ($currNode->nodeType == DOMIT_ELEMENT_NODE) {
							if ($currNode->lastChild != null) {
								$this->localNodeContainer[] =& $currNode->lastChild;
							}
						}
					}
				}
				break;

			case 'text()':
				$doProcess = true;
				$targetNodeType = DOMIT_TEXT_NODE;
				break;

			case 'comment()':
				$doProcess = true;
				$targetNodeType = DOMIT_COMMENT_NODE;
				break;

			case 'processing-instruction()':
				$doProcess = true;
				$targetNodeType = DOMIT_PROCESSING_INSTRUCTION_NODE;
				break;
		}

		if ($doProcess) {
			if (count($this->globalNodeContainer) != 0) {
				foreach ($this->globalNodeContainer as $key =>$value) {
					$currNode =& $this->globalNodeContainer[$key];

					if ($currNode->nodeType == DOMIT_ELEMENT_NODE) {
						$total = $currNode->childCount;

						for ($j = 0; $j < $total; $j++) {
							if ($currNode->childNodes[$j]->nodeType == $targetNodeType) {
								$this->localNodeContainer[] =& $currNode->childNodes[$j];
							}
						}
					}
				}
			}
		}

		$this->charContainer = '';
	} //selectNodesByFunction

	/**
	* Splits the supplied pattern into searchable segments
	* @param string The pattern
	*/
	function splitPattern($pattern) {
		//split multiple patterns if they exist (e.g. pattern1 | pattern2 | pattern3)
		$this->arPathSegments =& explode(DOMIT_XPATH_SEPARATOR_OR, $pattern);

		//split each pattern by relative path dividers (i.e., '//')
		$total = count($this->arPathSegments);

		for ($i = 0; $i < $total; $i++) {
			$this->arPathSegments[$i] =& explode(DOMIT_XPATH_SEPARATOR_RELATIVE, trim($this->arPathSegments[$i]));

			$currArray =& $this->arPathSegments[$i];
			$total2 = count($currArray);

			for ($j = 0; $j < $total2; $j++) {
				$currArray[$j] =& explode(DOMIT_XPATH_SEPARATOR_ABSOLUTE, $currArray[$j]);
			}
		}
	} //splitPattern

	/**
	* Converts long XPath syntax into abbreviated XPath syntax
	* @param string The pattern
	* @return string The normalized pattern
	*/
	function normalize($pattern) {
		$pattern = strtr($pattern, $this->normalizationTable);

		while (strpos($pattern, '  ') !== false) {
			$pattern = str_replace('  ', ' ', $pattern);
		}

		$pattern = strtr($pattern, $this->normalizationTable2);
		$pattern = strtr($pattern, $this->normalizationTable3);

		return $pattern;
	} //normalize

	/**
	* Initializes the contextNode and searchType
	* @param array The current array of path segments
	* @return int The index of the first array item to begin the search at
	*/
	function initSearch(&$currArPathSegments) {
		$this->globalNodeContainer = array();

		if (is_null($currArPathSegments[0])) {
			if (count($currArPathSegments) == 1) {
				//variable path
				$this->searchType = DOMIT_XPATH_SEARCH_VARIABLE;
				$this->globalNodeContainer[] =& $this->callingNode->ownerDocument;
			}
			else {
				//absolute path
				$this->searchType = DOMIT_XPATH_SEARCH_ABSOLUTE;
				$this->globalNodeContainer[] =& $this->callingNode->ownerDocument;
			}
		}
		else {
			//relative path
			$this->searchType = DOMIT_XPATH_SEARCH_RELATIVE;

			if ($this->callingNode->uid != $this->callingNode->ownerDocument->uid) {
				$this->globalNodeContainer[] =& $this->callingNode;
			}
			else {
				$this->globalNodeContainer[] =& $this->callingNode->ownerDocument;
			}
		}
	} //initSearch
} //DOMIT_XPath
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