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<?php // -*-php-*-
rcs_id('$Id: XmlParser.php,v 1.7 2007/05/27 19:47:31 rurban Exp $');
/**
* Base XmlParser Class.
* Requires the expat.so/.dll, usually enabled by default.
* Used by HtmlParser and RssParser.
*
* @author: Reini Urban
*
* TODO: Convert more perl Html::Element style to our XmlElement style
* Needed additions to XmlElement:
* Html::Element::parent() <=> XmlElement::parent
* Html::Element::attr() <=> XmlElement::getAttr()
* Html::Element::tag <=> XmlElement::_tag
* Html::Element::content_list() <=> ->getContent() ??? or ->_children[]
* all_external_attr_names() <=>
*
* Problems:
* The HtmlParser object set by xml_parse() doesn't keep its parameters,
* esp. $this->root is lost. So we have to this into a global.
*/
/*
This file is part of PhpWiki.
PhpWiki is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
PhpWiki is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with PhpWiki; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* class XmlParser - Parse into a tree of XmlElement nodes.
*
* PHP Problems:
* inside the handlers no globals are transported, only class vars.
* when leaving the handler class all class vars are destroyed, so we
* have to copy the root to a global.
*
*/
class XmlParser {
var $_parser, $root, $current;
function XmlParser($encoding = '') { // "ISO-8859-1"
if ($encoding)
$this->_parser = xml_parser_create($encoding);
else
$this->_parser = xml_parser_create();
xml_parser_set_option($this->_parser, XML_OPTION_TARGET_ENCODING, $GLOBALS['charset']);
//xml_set_object($this->_parser, &$this);
xml_set_element_handler($this->_parser,
array(&$this, 'tag_open'),
array(&$this, 'tag_close' ));
xml_set_character_data_handler($this->_parser,
array(&$this, 'cdata'));
//xml_set_element_handler($this->_parser, "tag_open", "tag_close");
//xml_set_character_data_handler($this->_parser, "cdata");
// Hack: workaround php OO bug
unset($GLOBALS['xml_parser_root']);
}
function __destruct() {
global $xml_parser_root, $xml_parser_current;
if (!empty($this->_parser)) xml_parser_free($this->_parser);
unset($this->_parser);
if (isset($xml_parser_root)) {
$xml_parser_root->_destruct();
unset($xml_parser_root); // nested parsing forbidden!
}
unset($xml_parser_current);
}
function tag_open($parser, $name, $attrs='') {
$this->_tag = strtolower($name);
$node = new XmlElement($this->_tag);
if (is_string($attrs) and !empty($attrs)) {
// lowercase attr names
foreach(split(' ',$attrs) as $pair) {
if (strstr($pair,"=")) {
list($key,$val) = split('=',$pair);
$key = strtolower(trim($key));
$val = str_replace(array('"',"'"),'',trim($val));
$node->_attr[$key] = $val;
} else {
$key = str_replace(array('"',"'"),'',strtolower(trim($pair)));
$node->_attr[$key] = $key;
}
}
} elseif (!empty($attrs) and is_array($attrs)) {
foreach ($attrs as $key => $val) {
$key = strtolower(trim($key));
$val = str_replace(array('"',"'"),'',trim($val));
$node->_attr[$key] = $val;
}
}
if (!is_null($this->current)) {
$this->current->_content[] =& $node; // copy or ref?
$node->parent =& $this->current; // ref
}
$this->current =& $node; // ref
if (empty($this->root)) {
$this->root =& $node; // ref for === test below
$GLOBALS['xml_parser_root'] =& $this->root; // copy
}
}
function tag_close($parser, $name, $attrs='') {
//$this->parent = $this->current; // copy!
//unset($this->current);
}
function cdata($parser, $data) {
if (isset($this->current)) {
$this->current->_content[] = $data;
} else {
trigger_error(sprintf("unparsed content outside tags: %s",$data), E_USER_WARNING);
}
if ($this->current === $this->root) { // workaround php OO bug: ref => copy
$GLOBALS['xml_parser_root'] =& $this->root; // copy!
//$this->root = $this->current; // copy?
}
}
function parse($content, $is_final = true) {
xml_parse($this->_parser, $content, $is_final) or
trigger_error(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($this->_parser)),
xml_get_current_line_number($this->_parser)),
E_USER_WARNING);
}
function parse_url($file, $debug=false) {
if (get_cfg_var('allow_url_fopen')) {
if (!($fp = fopen("$file","r"))) {
trigger_error("Error parse url $file");
return;
}
$content = "";
while ($data = fread($fp, 4096)) {
$content .= $data;
}
fclose($fp);
$this->parse($content);
} else {
// other url_fopen workarounds: curl, socket (http 80 only)
$data = url_get_contents($file);
if (empty($data)) {
trigger_error("Error parse url $file");
return;
}
$this->parse($data);
}
}
}
// $Log: XmlParser.php,v $
// Revision 1.7 2007/05/27 19:47:31 rurban
// Disable chunkwise xml parsing because of php crashes
//
// Revision 1.6 2004/11/03 16:34:11 rurban
// proper msg if rss connection is broken or no items found
//
// Revision 1.5 2004/06/20 14:42:54 rurban
// various php5 fixes (still broken at blockparser)
//
// Revision 1.4 2004/06/08 21:03:20 rurban
// updated RssParser for XmlParser quirks (store parser object params in globals)
//
// Revision 1.3 2004/06/03 18:06:29 rurban
// fix file locking issues (only needed on write)
// fixed immediate LANG and THEME in-session updates if not stored in prefs
// advanced editpage toolbars (search & replace broken)
//
// Revision 1.2 2004/06/01 15:28:00 rurban
// AdminUser only ADMIN_USER not member of Administrators
// some RateIt improvements by dfrankow
// edit_toolbar buttons
//
// Revision 1.1 2004/05/24 17:31:31 rurban
// new XmlParser and HtmlParser, RssParser based on that.
//
//
// 2004-04-09 16:30:50 rurban:
// added fsockopen allow_url_fopen = Off workaround
// For emacs users
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
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