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<?php
class XmlTreeBuilder
{
private $parser;
private $node_stack;
private $cur_node;
private $cur_val;
//TAG=0, VALUE=1, ELEMENTS=2
public function &ParseFile($filename, &$err)
{
if ( !is_file($filename) )
{
$err = $filename . ' is not a valid file.';
return NULL;
}
$fd = fopen($filename, 'r');
if ( !$fd )
{
$err = 'failed to open file ' . $filename;
return NULL;
}
$len = filesize($filename);
if ( $len > 0 )
{
$contents = fread($fd, $len);
fclose($fd);
$root = $this->parseString($contents, $err);
}
else
{
$root = array();
fclose($fd);
}
if ( $err != NULL )
{
$err .= '<br> Failed to parse file ' . $filename;
return NULL;
}
return $root;
}
private function parseString($xmlstring, &$err)
{
$this->parser = xml_parser_create();
xml_set_object($this->parser, $this);
xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($this->parser, 'startElement', 'endElement');
xml_set_character_data_handler($this->parser, 'characterData');
// Build a Root node and initialize the node_stack...
$this->node_stack = array();
$this->cur_node = NULL;
$this->startElement(null, 'root', array());
// parse the data and free the parser...
$result = xml_parse($this->parser, $xmlstring);
if ( !$result )
{
$err = 'XML error: '. xml_error_string(xml_get_error_code($this->parser))
. ' at line ' . xml_get_current_line_number($this->parser);
}
xml_parser_free($this->parser);
if ( !$result )
return NULL;
// return the root node...
return $this->cur_node[2][0];
}
private function startElement($parser, $name, $attrs)
{
if ( $this->cur_node != NULL )
{
$this->node_stack[] = $this->cur_node;
}
$this->cur_node = array();
$this->cur_node[0] = $name; //'TAG'=0
// foreach ($attrs as $key => $value)
// {
// $node[$key] = $value;
// } //no attributes used in xml
$this->cur_val = '';
$this->cur_node[2] = array();//'ELEMENTS'=2
}
private function endElement($parser, $name)
{
$this->cur_node[1] = trim($this->cur_val);//'VALUE'=1
$node = $this->cur_node;
// and add it an element of the last node in the stack...
$this->cur_node = array_pop($this->node_stack);
$this->cur_node[2][] = $node;
}
private function characterData($parser, $data)
{
// add this data to the last node in the stack...
$this->cur_val .= $data;
}
private function xmlNodeOutput(&$node, $space)
{
$output = str_repeat(' ', $space);
$attrs = array();
foreach( array_keys($node) as $key )
{
if ( $key == 0 ) //'TAG'
{
$name = &$node[0];
}
elseif ( $key == 1 ) //'VALUE'
{
$data = &$node[1];
}
elseif ( $key == 2 ) //'ELEMENTS'
{
$elements = &$node[2];
}
else
{
$attrs[$key] = $node[$key];
}
}
$name = $node[0]; //'TAG'
$output .= "<$name";
if ( count($attrs) > 0 )
{
foreach( $attrs as $key => $value )
{
$output .= " $key=\"$value\"";
}
}
$output .= '>';
if ( count($elements) == 0 )
{
$output .= "$data</$name>\n";
}
else
{
$output .= "\n";
if ( $data )
{
$output .= str_repeat(' ', $space+1);
$output .= $data . "\n";
}
foreach( array_keys($elements) as $key )
{
$output .= $this->xmlNodeOutput($elements[$key], $space+1);
}
$output .= str_repeat(' ', $space);
$output .= "</$name>\n";
}
return $output ;
}
}