<?php
/**
* @package domit-xmlparser
* @copyright (C) 2004 John Heinstein. All rights reserved
* @license http://www.gnu.org/copyleft/lesser.html LGPL License
* @author John Heinstein <johnkarl@nbnet.nb.ca>
* @link http://www.engageinteractive.com/domit/ DOMIT! Home Page
* DOMIT! is Free Software
**/
if (!defined('DOMIT_INCLUDE_PATH')) {
define('DOMIT_INCLUDE_PATH', (dirname(__FILE__) . "/"));
}
/** Separator for elements path */
define('GET_ELEMENTS_BY_PATH_SEPARATOR', '/');
/** Constant for an absolute path search (starting at the document root) */
define('GET_ELEMENTS_BY_PATH_SEARCH_ABSOLUTE', 0);
/** Constant for a relative path search (starting at the level of the calling node) */
define('GET_ELEMENTS_BY_PATH_SEARCH_RELATIVE', 1);
/** Constant for a variable path search (finds all matches, regardless of place in the hierarchy) */
define('GET_ELEMENTS_BY_PATH_SEARCH_VARIABLE', 2);
/**
* getElementsByPath is a simple utility for path-based access to nodes in a DOMIT! document.
*/
class DOMIT_GetElementsByPath {
/** @var Object The node from which the search is called */
var $callingNode;
/** @var int The type of search to be performed, i.e., relative, absolute, or variable */
var $searchType;
/** @var Object The node that is the current parent of the search */
var $contextNode;
/** @var array An array containing a series of path segments for which to search */
var $arPathSegments = array();
/** @var Object A DOMIT_NodeList of matching nodes */
var $nodeList;
/** @var Object The index of the current node of the search */
var $targetIndex;
/** @var Object if true, the search will be aborted once the first match is found */
var $abortSearch = false;
/**
* Constructor - creates an empty DOMIT_NodeList to store matching nodes
*/
function DOMIT_GetElementsByPath() {
require_once(DOMIT_INCLUDE_PATH . 'xml_domit_nodemaps.php');
$this->nodeList = new DOMIT_NodeList();
} //DOMIT_GetElementsByPath
/**
* Parses the supplied "path"-based pattern
* @param Object The node from which the search is called
* @param string The pattern
* @param int The node level of the current search
* @return Object The NodeList containing matching nodes
*/
function &parsePattern(&$node, $pattern, $nodeIndex = 0) {
$this->callingNode =& $node;
$pattern = trim($pattern);
$this->determineSearchType($pattern);
$this->setContextNode();
$this->splitPattern($pattern);
$this->targetIndex = $nodeIndex;
$totalSegments = count($this->arPathSegments);
if ($totalSegments > 0) {
if ($this->searchType == GET_ELEMENTS_BY_PATH_SEARCH_VARIABLE) {
$arContextNodes =& $this->contextNode->ownerDocument->getElementsByTagName($this->arPathSegments[0]);
$totalContextNodes = $arContextNodes->getLength();
for ($i = 0; $i < $totalContextNodes; $i++) {
$this->selectNamedChild($arContextNodes->item($i), 1);
}
}
else {
if ($this->searchType == GET_ELEMENTS_BY_PATH_SEARCH_ABSOLUTE) {
if ($this->contextNode->nodeName == $this->arPathSegments[0]) {
if (count($this->arPathSegments) == 1) {
$this->nodeList->appendNode($this->contextNode);
}
else {
$this->selectNamedChild($this->contextNode, 1);
}
}
}
else if ($this->searchType == GET_ELEMENTS_BY_PATH_SEARCH_RELATIVE) {
$this->selectNamedChild($this->contextNode, 0);
}
}
}
if ($nodeIndex > 0) {
if ($nodeIndex <= $this->nodeList->getLength()) {
return $this->nodeList->item(($nodeIndex - 1));
}
else {
$null = null;
return $null;
}
}
return $this->nodeList;
} //parsePattern
/**
* Determines the type of search to be performed: absolute, relative, or variable
* @param string The pattern
*/
function determineSearchType($pattern) {
$firstChar = $pattern{0};
if ($firstChar != GET_ELEMENTS_BY_PATH_SEPARATOR) {
//relative path
$this->searchType = GET_ELEMENTS_BY_PATH_SEARCH_RELATIVE;
}
else {
$secondChar = $pattern{1};
if ($secondChar != GET_ELEMENTS_BY_PATH_SEPARATOR) {
//absolute path
$this->searchType = GET_ELEMENTS_BY_PATH_SEARCH_ABSOLUTE;
}
else {
//variable path
$this->searchType = GET_ELEMENTS_BY_PATH_SEARCH_VARIABLE;
}
}
} //determineSearchType
/**
* Sets the context node, i.e., the node from which the search begins
*/
function setContextNode() {
switch($this->searchType) {
case GET_ELEMENTS_BY_PATH_SEARCH_ABSOLUTE:
$this->contextNode =& $this->callingNode->ownerDocument->documentElement;
break;
case GET_ELEMENTS_BY_PATH_SEARCH_RELATIVE:
if ($this->callingNode->uid != $this->callingNode->ownerDocument->uid) {
$this->contextNode =& $this->callingNode;
}
else {
$this->contextNode =& $this->callingNode->ownerDocument->documentElement;
}
break;
case GET_ELEMENTS_BY_PATH_SEARCH_VARIABLE:
$this->contextNode =& $this->callingNode->ownerDocument->documentElement;
break;
}
} //setContextNode
/**
* Splits the supplied pattern into searchable segments
* @param string The pattern
*/
function splitPattern($pattern) {
switch($this->searchType) {
case GET_ELEMENTS_BY_PATH_SEARCH_ABSOLUTE:
$lastIndex = 1;
break;
case GET_ELEMENTS_BY_PATH_SEARCH_RELATIVE:
$lastIndex = 0;
break;
case GET_ELEMENTS_BY_PATH_SEARCH_VARIABLE:
$lastIndex = 2;
break;
}
$this->arPathSegments = explode(GET_ELEMENTS_BY_PATH_SEPARATOR, substr($pattern, $lastIndex));
} //splitPattern
/**
* Matches the current path segment against the child nodes of the current context node
* @param Object The context node
* @param int The index in the arPathSegments array of the current path segment
*/
function selectNamedChild(&$node, $pIndex) {
if (!$this->abortSearch) {
if ($pIndex < count($this->arPathSegments)) { //not at last path segment
$name = $this->arPathSegments[$pIndex];
$numChildren = $node->childCount;
for ($i = 0; $i < $numChildren; $i++) {
$currentChild =& $node->childNodes[$i];
if ($currentChild->nodeName == $name) {
$this->selectNamedChild($currentChild, ($pIndex + 1));
}
}
}
else {
$this->nodeList->appendNode($node);
if ($this->targetIndex == $this->nodeList->getLength()) {
$this->abortSearch = true;
}
}
}
} //selectNamedChild
} //DOMIT_GetElementsByPath
/**
* getElementsByAttributePath is a temporary utility requested by a DOMIT! user for path-based access to attributes in a DOMIT! document.
* This class may be absent from future versions of DOMIT!
*/
class DOMIT_GetElementsByAttributePath {
/** @var Object A DOMIT_NodeList of matching attribute nodes */
var $nodeList;
/**
* Constructor - creates an empty DOMIT_NodeList to store matching nodes
*/
function DOMIT_GetElementsByAttributePath() {
require_once(DOMIT_INCLUDE_PATH . 'xml_domit_nodemaps.php');
$this->nodeList = new DOMIT_NodeList();
} //DOMIT_GetElementsByAttributePath
/**
* Matches the current path segment against the child nodes of the current context node
* @param Object The context node
* @param string The pattern
* @param int The index of the current path segment
*/
function &parsePattern(&$node, $pattern, $nodeIndex = 0) {
$beginSquareBrackets = strpos($pattern, '[');
if ($beginSquareBrackets != 0) {
$path = substr($pattern, 0, $beginSquareBrackets);
$attrPattern = substr($pattern, (strpos($pattern, '@') + 1));
$attrPattern = substr($attrPattern, 0, strpos($attrPattern, ')'));
$commaIndex = strpos($attrPattern, ',');
$key = trim(substr($attrPattern, 0, $commaIndex));
$value = trim(substr($attrPattern, ($commaIndex + 1)));
$value = substr($value, 1, (strlen($value) - 2));
$gebp = new DOMIT_GetElementsByPath();
$myResponse =& $gebp->parsePattern($node, $path);
$total = $myResponse->getLength();
for ($i = 0; $i < $total; $i++) {
$currNode =& $myResponse->item($i);
if ($currNode->hasAttribute($key)) {
if ($currNode->getAttribute($key) == $value) {
$this->nodeList->appendNode($currNode);
}
}
}
}
if ($nodeIndex == 0) {
return $this->nodeList;
}
else {
if ($nodeIndex <= $this->nodeList->getLength()) {
return $this->nodeList->item(($nodeIndex - 1));
}
else {
$this->nodeList = new DOMIT_NodeList();
return $this->nodeList;
}
}
} //parsePattern
} //DOMIT_GetElementsByAttributePath
?>
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