public function addAlternate(PhpType $alternate)
{
// build() returns the bottom type by default, so we can
// just bail out early here.
if ($alternate->isNoType()) {
return $this;
}
$this->isAllType = $this->isAllType || $alternate->isAllType();
$isAlternateUnknown = $alternate instanceof UnknownType;
// instanceof is desired here
$this->isNativeUnknownType = $this->isNativeUnknownType || $isAlternateUnknown;
if ($isAlternateUnknown) {
$this->areAllUnknownsChecked = $this->areAllUnknownsChecked && $alternate->isChecked();
}
if (!$this->isAllType && !$this->isNativeUnknownType) {
if ($alternate->isUnionType()) {
$union = $alternate->toMaybeUnionType();
foreach ($union->getAlternates() as $unionAlt) {
$this->addAlternate($unionAlt);
}
} else {
// Look through the alternates we've got so far,
// and check if any of them are duplicates of
// one another.
foreach ($this->alternates as $index => $current) {
// The Unknown type is special in that we cannot use our
// subtype based check, but need to check for equality to
// avoid duplicates, and not remove all other alternates.
if ($alternate->isUnknownType()) {
if ($alternate->equals($current)) {
return $this;
}
continue;
}
// Check if we already have a more general type in the union.
// Then, we do not add this alternate.
if ($alternate->isSubTypeOf($current)) {
return $this;
}
// Check if we have a subtype of the passed alternate. Then,
// we remove that alternate in favor of the newly passed one.
if ($current->isSubTypeOf($alternate)) {
unset($this->alternates[$index]);
}
}
$this->alternates[] = $alternate;
}
}
return $this;
}
private function getReturnTypeAsString(PhpType $type, array $importedNamespaces)
{
if ($type->isNullType() || $type->isNoType()) {
return 'void';
}
return $type->getDocType($importedNamespaces);
}
/**
* Emulates a loose comparison between two types, and returns the result.
*
* The result can be true, false, or unknown:
*
* - true: loose comparison of these types is always true
* - false: loose comparison of these types is always false
* - unknown: outcome depends on the actual values of these types
*
* @see http://php.net/manual/en/types.comparisons.php (table with loose comparison ==)
*
* @param PhpType $thisType
* @param PhpType $thatType
*/
public function testForEquality(PhpType $that)
{
if ($that->isAllType() || $that->isUnknownType() || $that->isNoResolvedType() || $this->isAllType() || $this->isUnknownType() || $this->isNoResolvedType()) {
return TernaryValue::get('unknown');
}
if ($this->isNoType() || $that->isNoType()) {
if ($this->isNoType() && $that->isNoType()) {
return TernaryValue::get('true');
}
return TernaryValue::get('unknown');
}
$isThisNumeric = $this->isIntegerType() || $this->isDoubleType();
$isThatNumeric = $that->isIntegerType() || $that->isDoubleType();
if (($isThisNumeric || $this->isStringType()) && $that->isArrayType() || ($isThatNumeric || $that->isStringType()) && $this->isArrayType()) {
return TernaryValue::get('false');
}
if ($this->isObjectType() ^ $that->isObjectType()) {
return TernaryValue::get('false');
}
if ($that->isUnionType()) {
return $that->testForEquality($this);
}
if ($this->isArrayType() && $that->isArrayType()) {
// TODO: Maybe make this more sophisticated by looking at the key,
// and element types.
return TernaryValue::get('unknown');
}
// If this is reached, then this base type does not have enough information to
// make an informed decision, but the method should be overridden by a subtype
// as this method eventually is never allowed to return null.
return null;
}
