function build($xmlstring)
{
if (empty($xmlstring)) {
trigger_error("Can not buid tree with empty xml", E_USER_ERROR);
}
// Detect if we're using PHP 4 (DOM XML extension)
// or PHP 5 (DOM extension)
// First uses a set of domxml_* functions,
// Second - object-oriented interface
// Third - pure PHP XML parser
if (function_exists('domxml_open_mem')) {
require_once HTML2PS_DIR . 'dom.php4.inc.php';
return PHP4DOMTree::from_DOMDocument(domxml_open_mem($xmlstring));
}
if (class_exists('DOMDocument')) {
require_once HTML2PS_DIR . 'dom.php5.inc.php';
return DOMTree::from_DOMDocument(DOMDocument::loadXML($xmlstring));
}
require_once HTML2PS_DIR . 'dom.activelink.inc.php';
if (file_exists(HTML2PS_DIR . 'classes/include.php')) {
require_once HTML2PS_DIR . 'classes/include.php';
import('org.active-link.xml.XML');
import('org.active-link.xml.XMLDocument');
// preprocess character references
// literal references (actually, parser SHOULD do it itself; nevertheless, Activelink just ignores these entities)
$xmlstring = preg_replace("/&/", "&", $xmlstring);
$xmlstring = preg_replace("/"/", "\"", $xmlstring);
$xmlstring = preg_replace("/</", "<", $xmlstring);
$xmlstring = preg_replace("/>/", ">", $xmlstring);
// in decimal form
while (preg_match("@&#(\\d+);@", $xmlstring, $matches)) {
$xmlstring = preg_replace("@&#" . $matches[1] . ";@", code_to_utf8($matches[1]), $xmlstring);
}
// in hexadecimal form
while (preg_match("@&#x(\\d+);@i", $xmlstring, $matches)) {
$xmlstring = preg_replace("@&#x" . $matches[1] . ";@i", code_to_utf8(hexdec($matches[1])), $xmlstring);
}
$tree = ActiveLinkDOMTree::from_XML(new XML($xmlstring));
return $tree;
}
die("None of DOM/XML, DOM or ActiveLink DOM extension found. Check your PHP configuration.");
}
function &previous_sibling()
{
$sibling =& PHP4DOMTree::from_DOMDocument($this->_element->previous_sibling());
return $sibling;
}