/**
* Returns a wrapper function that will allow the function to be called
* with excessive number of arguments, this is useful for internal function support.
* Note that references will not be maintained.
*
* @param callable $function
*
* @return callable
*/
public static function allowExcessiveArguments(callable $function)
{
$reflection = Reflection::fromCallable($function);
if ($reflection->isUserDefined()) {
return $function;
}
if (Reflection::isVariadic($reflection)) {
return $function;
}
$numberOfArguments = $reflection->getNumberOfParameters();
$argumentLimiter = function () use($function, $numberOfArguments) {
return call_user_func_array($function, array_slice(func_get_args(), 0, $numberOfArguments));
};
/*
* If there are default values, just use the default closure to
* ensure correct default values are used for unsupplied arguments.
*/
if ($numberOfArguments !== $reflection->getNumberOfRequiredParameters()) {
return $argumentLimiter;
}
/*
* Micro-optimization: provide simple wrappers for internal functions
* with simple signatures rather than the more costly argument array slicing.
*/
switch ($numberOfArguments) {
case 0:
return function () use($function) {
return $function();
};
case 1:
return function ($a) use($function) {
return $function($a);
};
case 2:
return function ($a, $b) use($function) {
return $function($a, $b);
};
case 3:
return function ($a, $b, $c) use($function) {
return $function($a, $b, $c);
};
case 4:
return function ($a, $b, $c, $d) use($function) {
return $function($a, $b, $c, $d);
};
default:
return $argumentLimiter;
}
}
/**
* @expectedException \Pinq\Parsing\InvalidFunctionException
*/
public function testFunctionAfterReflectionGetClosure()
{
$asClosure = (new \ReflectionFunction(__NAMESPACE__ . '\\funcHelper'))->getClosure();
$reflection = Reflection::fromCallable($asClosure);
$this->assertIsFunctionReflection($reflection);
}