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<?php
/**
* Class to implement stub globals, which are globals that delay loading the
* their associated module code by deferring initialisation until the first
* method call.
*
* Note on unstub loops:
*
* Unstub loops (infinite recursion) sometimes occur when a constructor calls
* another function, and the other function calls some method of the stub. The
* best way to avoid this is to make constructors as lightweight as possible,
* deferring any initialisation which depends on other modules. As a last
* resort, you can use StubObject::isRealObject() to break the loop, but as a
* general rule, the stub object mechanism should be transparent, and code
* which refers to it should be kept to a minimum.
*/
class StubObject {
var $mGlobal, $mClass, $mParams;
function __construct( $global = null, $class = null, $params = array() ) {
$this->mGlobal = $global;
$this->mClass = $class;
$this->mParams = $params;
}
static function isRealObject( $obj ) {
return is_object( $obj ) && !($obj instanceof StubObject);
}
function _call( $name, $args ) {
$this->_unstub( $name, 5 );
return call_user_func_array( array( $GLOBALS[$this->mGlobal], $name ), $args );
}
function _newObject() {
return wfCreateObject( $this->mClass, $this->mParams );
}
function __call( $name, $args ) {
return $this->_call( $name, $args );
}
/**
* This is public, for the convenience of external callers wishing to access
* properties, e.g. eval.php
*/
function _unstub( $name = '_unstub', $level = 2 ) {
static $recursionLevel = 0;
if ( get_class( $GLOBALS[$this->mGlobal] ) != $this->mClass ) {
$fname = __METHOD__.'-'.$this->mGlobal;
wfProfileIn( $fname );
$caller = wfGetCaller( $level );
if ( ++$recursionLevel > 2 ) {
throw new MWException( "Unstub loop detected on call of \${$this->mGlobal}->$name from $caller\n" );
}
wfDebug( "Unstubbing \${$this->mGlobal} on call of \${$this->mGlobal}->$name from $caller\n" );
$GLOBALS[$this->mGlobal] = $this->_newObject();
--$recursionLevel;
wfProfileOut( $fname );
}
}
}
class StubContLang extends StubObject {
function __construct() {
parent::__construct( 'wgContLang' );
}
function __call( $name, $args ) {
return StubObject::_call( $name, $args );
}
function _newObject() {
global $wgContLanguageCode;
$obj = Language::factory( $wgContLanguageCode );
$obj->initEncoding();
$obj->initContLang();
return $obj;
}
}
class StubUserLang extends StubObject {
function __construct() {
parent::__construct( 'wgLang' );
}
function __call( $name, $args ) {
return $this->_call( $name, $args );
}
function _newObject() {
global $wgContLanguageCode, $wgRequest, $wgUser, $wgContLang;
$code = $wgRequest->getVal('uselang', $wgUser->getOption('language') );
// if variant is explicitely selected, use it instead the one from wgUser
// see bug #7605
if($wgContLang->hasVariants()){
$variant = $wgContLang->getPreferredVariant();
if($variant != $wgContLanguageCode)
$code = $variant;
}
# Validate $code
if( empty( $code ) || !preg_match( '/^[a-z-]+$/', $code ) ) {
wfDebug( "Invalid user language code\n" );
$code = $wgContLanguageCode;
}
if( $code == $wgContLanguageCode ) {
return $wgContLang;
} else {
$obj = Language::factory( $code );
return $obj;
}
}
}
class StubUser extends StubObject {
function __construct() {
parent::__construct( 'wgUser' );
}
function __call( $name, $args ) {
return $this->_call( $name, $args );
}
function _newObject() {
global $wgCommandLineMode;
if( $wgCommandLineMode ) {
$user = new User;
} else {
$user = User::newFromSession();
wfRunHooks('AutoAuthenticate',array(&$user));
}
return $user;
}
}
?>
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