PHP中的类－操作XML(3)

/* Here are the XML functions needed by expat */


/* when expat hits an opening tag, it fires up this function */

function startElement($parser, $name, $attrs) {

array_push($this->current_tag, $name); // add tag to the cur. tag array

$curtag = implode("_",$this->current_tag); // piece together tag

/* this tracks what array index we are on for this tag */

if(isset($this->tagtracker["$curtag"])) {
$this->tagtracker["$curtag"]++;
} else {
$this->tagtracker["$curtag"]=0;
}


/* if there are attributes for this tag, we set them here. */

if(count($attrs)>0) {
$j = $this->tagtracker["$curtag"];
if(!$j) $j = 0;

if(!is_object($GLOBALS[$this->identifier]["$curtag"][$j])) {
$GLOBALS[$this->identifier]["$curtag"][$j] = new xml_container;
}

$GLOBALS[$this->identifier]["$curtag"][$j]->store("attributes",$attrs);
}

} // end function startElement



/* when expat hits a closing tag, it fires up this function */

function endElement($parser, $name) {

$curtag = implode("_",$this->current_tag); // piece together tag
// before we pop it off,
// so we can get the correct
// cdata

if(!$this->tagdata["$curtag"]) {
$popped = array_pop($this->current_tag); // or else we screw up where we are
return; // if we have no data for the tag
} else {
$TD = $this->tagdata["$curtag"];
unset($this->tagdata["$curtag"]);
}

$popped = array_pop($this->current_tag);
// we want the tag name for
// the tag above this, it
// allows us to group the
// tags together in a more
// intuitive way.

if(sizeof($this->current_tag) == 0) return; // if we aren't in a tag

$curtag = implode("_",$this->current_tag); // piece together tag
// this time for the arrays

$j = $this->tagtracker["$curtag"];
if(!$j) $j = 0;

if(!is_object($GLOBALS[$this->identifier]["$curtag"][$j])) {
$GLOBALS[$this->identifier]["$curtag"][$j] = new xml_container;
}

$GLOBALS[$this->identifier]["$curtag"][$j]->store($name,$TD); #$this->tagdata["$curtag"]);
unset($TD);
return TRUE;
}



/* when expat finds some internal tag character data,
it fires up this function */

function characterData($parser, $cdata) {
$curtag = implode("_",$this->current_tag); // piece together tag
$this->tagdata["$curtag"] .= $cdata;
}


/* this is the constructor: automatically called when the class is initialized */

function xml($data,$identifier='xml') {

$this->identifier = $identifier;

// create parser object
$this->xml_parser = xml_parser_create();

// set up some options and handlers
xml_set_object($this->xml_parser,$this);
xml_parser_set_option($this->xml_parser,XML_OPTION_CASE_FOLDING,0);
xml_set_element_handler($this->xml_parser, "startElement", "endElement");
xml_set_character_data_handler($this->xml_parser, "characterData");

if (!xml_parse($this->xml_parser, $data, TRUE)) {
sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($this->xml_parser)),
xml_get_current_line_number($this->xml_parser));
}

// we are done with the parser, so let's free it
xml_parser_free($this->xml_parser);

} // end constructor: function xml()


} // thus, we end our class xml

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