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<?php
class XmlTypeCheck {
/**
* Will be set to true or false to indicate whether the file is
* well-formed XML. Note that this doesn't check schema validity.
*/
public $wellFormed = false;
/**
* Name of the document's root element, including any namespace
* as an expanded URL.
*/
public $rootElement = '';
private $softNamespaces;
private $namespaces = array();
/**
* @param $file string filename
* @param $softNamespaces bool
* If set to true, use of undeclared XML namespaces will be ignored.
* This matches the behavior of rsvg, but more compliant consumers
* such as Firefox will reject such files.
* Leave off for the default, stricter checks.
*/
function __construct( $file, $softNamespaces=false ) {
$this->softNamespaces = $softNamespaces;
$this->run( $file );
}
private function run( $fname ) {
if( $this->softNamespaces ) {
$parser = xml_parser_create( 'UTF-8' );
} else {
$parser = xml_parser_create_ns( 'UTF-8' );
}
// case folding violates XML standard, turn it off
xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
xml_set_element_handler( $parser, array( $this, 'elementOpen' ), false );
$file = fopen( $fname, "rb" );
do {
$chunk = fread( $file, 32768 );
$ret = xml_parse( $parser, $chunk, feof( $file ) );
if( $ret == 0 ) {
// XML isn't well-formed!
fclose( $file );
xml_parser_free( $parser );
return;
}
} while( !feof( $file ) );
$this->wellFormed = true;
fclose( $file );
xml_parser_free( $parser );
}
private function elementOpen( $parser, $name, $attribs ) {
if( $this->softNamespaces ) {
// Check namespaces manually, so expat doesn't throw
// errors on use of undeclared namespaces.
foreach( $attribs as $attrib => $val ) {
if( $attrib == 'xmlns' ) {
$this->namespaces[''] = $val;
} elseif( substr( $attrib, 0, strlen( 'xmlns:' ) ) == 'xmlns:' ) {
$this->namespaces[substr( $attrib, strlen( 'xmlns:' ) )] = $val;
}
}
if( strpos( $name, ':' ) === false ) {
$ns = '';
$subname = $name;
} else {
list( $ns, $subname ) = explode( ':', $name, 2 );
}
if( isset( $this->namespaces[$ns] ) ) {
$name = $this->namespaces[$ns] . ':' . $subname;
} else {
// Technically this is invalid for XML with Namespaces.
// But..... we'll just let it slide in soft mode.
}
}
// We only need the first open element
$this->rootElement = $name;
xml_set_element_handler( $parser, false, false );
}
}
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