public function juggle(Type $type)
{
/*
* This is a predicate to determine whether the CURRENT type (the child class)
* can be juggled into the Type $type.
*/
$predicate = function (Type $element) {
return array_any($this->getAllowedJuggleTypes(), function (Type $value, $index, $collection) use($element) {
return (bool) Type::intersect($element, $value);
});
};
$x = array_filter($type->getTypes(), $predicate);
if (!$x) {
return null;
}
if (count($x) === 1) {
return first($x);
}
return UnionType::createIfNotDuplicate(array_shift($x), ...$x);
}
public function testJuggleScalar()
{
$x = new UnionType(new StringType(), new IntType());
$this->assertInstanceOf(FloatType::class, $x->juggle(new FloatType()));
// e.g. not NULL
}
