public function getUnionType() : UnionType
{
if (!empty($this->future_union_type)) {
// null out the future_union_type before
// we compute it to avoid unbounded
// recursion
$future_union_type = $this->future_union_type;
$this->future_union_type = null;
// Set a default value for my type in case
// there's some unbounded recursion
$this->setUnionType(new UnionType([IntType::instance(), FloatType::instance(), StringType::instance(), BoolType::instance()]));
$this->setUnionType($future_union_type->get());
}
return parent::getUnionType();
}
/**
* @param string $string
* A string representing a type
*
* @param Context $context
* The context in which the type string was
* found
*
* @return Type
* Parse a type from the given string
*/
public static function fromStringInContext(string $string, Context $context) : Type
{
assert($string !== '', "Type cannot be empty in {$context}");
$namespace = null;
// Extract the namespace if the type string is
// fully-qualified
if ('\\' === $string[0]) {
list($namespace, $string) = self::namespaceAndTypeFromString($string);
}
$type_name = $string;
// @var bool
// True if this type name if of the form 'C[]'
$is_generic_array_type = self::isGenericArrayString($type_name);
// If this is a generic array type, get the name of
// the type of each element
$non_generic_array_type_name = $type_name;
if ($is_generic_array_type && false !== ($pos = strpos($type_name, '[]'))) {
$non_generic_array_type_name = substr($type_name, 0, $pos);
}
// Check to see if the type name is mapped via
// a using clause.
//
// Gotta check this before checking for native types
// because there are monsters out there that will
// remap the names via things like `use \Foo\String`.
if ($context->hasNamespaceMapFor(T_CLASS, $non_generic_array_type_name)) {
$fqsen = $context->getNamespaceMapFor(T_CLASS, $non_generic_array_type_name);
if ($is_generic_array_type) {
return GenericArrayType::fromElementType(Type::make($fqsen->getNamespace(), $fqsen->getName()));
}
return Type::make($fqsen->getNamespace(), $fqsen->getName());
}
// If this was a fully qualified type, we're all
// set
if (!empty($namespace)) {
return self::fromNamespaceAndName($namespace, $type_name);
}
if ($is_generic_array_type && self::isNativeTypeString($type_name)) {
return self::fromInternalTypeName($type_name);
} else {
// Check to see if its a builtin type
switch (self::canonicalNameFromName($type_name)) {
case 'array':
return \Phan\Language\Type\ArrayType::instance();
case 'bool':
return \Phan\Language\Type\BoolType::instance();
case 'callable':
return \Phan\Language\Type\CallableType::instance();
case 'float':
return \Phan\Language\Type\FloatType::instance();
case 'int':
return \Phan\Language\Type\IntType::instance();
case 'mixed':
return \Phan\Language\Type\MixedType::instance();
case 'null':
return \Phan\Language\Type\NullType::instance();
case 'object':
return \Phan\Language\Type\ObjectType::instance();
case 'resource':
return \Phan\Language\Type\ResourceType::instance();
case 'string':
return \Phan\Language\Type\StringType::instance();
case 'void':
return \Phan\Language\Type\VoidType::instance();
}
}
// Things like `self[]` or `$this[]`
if ($is_generic_array_type && self::isSelfTypeString($non_generic_array_type_name) && $context->isInClassScope()) {
// Callers of this method should be checking on their own
// to see if this type is a reference to 'parent' and
// dealing with it there. We don't want to have this
// method be dependent on the code base
assert('parent' !== $non_generic_array_type_name, __METHOD__ . " does not know how to handle the type name 'parent' in {$context}");
return GenericArrayType::fromElementType(static::fromFullyQualifiedString((string) $context->getClassFQSEN()));
}
// If this is a type referencing the current class
// in scope such as 'self' or 'static', return that.
if (self::isSelfTypeString($type_name) && $context->isInClassScope()) {
// Callers of this method should be checking on their own
// to see if this type is a reference to 'parent' and
// dealing with it there. We don't want to have this
// method be dependent on the code base
assert('parent' !== $type_name, __METHOD__ . " does not know how to handle the type name 'parent' in {$context}");
return static::fromFullyQualifiedString((string) $context->getClassFQSEN());
}
// Attach the context's namespace to the type name
return self::fromNamespaceAndName($context->getNamespace() ?: '\\', $type_name);
}
/**
* Visit a node with kind `\ast\AST_CAST`
*
* @param Node $node
* A node of the type indicated by the method name that we'd
* like to figure out the type that it produces.
*
* @return UnionType
* The set of types that are possibly produced by the
* given node
*/
public function visitCast(Node $node) : UnionType
{
switch ($node->flags) {
case \ast\flags\TYPE_NULL:
return NullType::instance()->asUnionType();
case \ast\flags\TYPE_BOOL:
return BoolType::instance()->asUnionType();
case \ast\flags\TYPE_LONG:
return IntType::instance()->asUnionType();
case \ast\flags\TYPE_DOUBLE:
return FloatType::instance()->asUnionType();
case \ast\flags\TYPE_STRING:
return StringType::instance()->asUnionType();
case \ast\flags\TYPE_ARRAY:
return ArrayType::instance()->asUnionType();
case \ast\flags\TYPE_OBJECT:
return ObjectType::instance()->asUnionType();
default:
Log::err(Log::EFATAL, 'Unknown type (' . $node->flags . ') in cast');
}
}
/**
* @param string $string
* A string representing a type
*
* @param Context $context
* The context in which the type string was
* found
*
* @return Type
* Parse a type from the given string
*/
public static function fromStringInContext(string $string, Context $context) : Type
{
assert($string !== '', "Type cannot be empty");
// Extract the namespace, type and parameter type name list
$tuple = self::typeStringComponents($string);
$namespace = $tuple->_0;
$type_name = $tuple->_1;
$template_parameter_type_name_list = $tuple->_2;
// Map the names of the types to actual types in the
// template parameter type list
$template_parameter_type_list = array_map(function (string $type_name) use($context) {
return Type::fromStringInContext($type_name, $context)->asUnionType();
}, $template_parameter_type_name_list);
// @var bool
// True if this type name if of the form 'C[]'
$is_generic_array_type = self::isGenericArrayString($type_name);
// If this is a generic array type, get the name of
// the type of each element
$non_generic_array_type_name = $type_name;
if ($is_generic_array_type && false !== ($pos = strrpos($type_name, '[]'))) {
$non_generic_array_type_name = substr($type_name, 0, $pos);
}
// Check to see if the type name is mapped via
// a using clause.
//
// Gotta check this before checking for native types
// because there are monsters out there that will
// remap the names via things like `use \Foo\String`.
$non_generic_partially_qualified_array_type_name = $non_generic_array_type_name;
if ($namespace) {
$non_generic_partially_qualified_array_type_name = $namespace . '\\' . $non_generic_partially_qualified_array_type_name;
}
if ($context->hasNamespaceMapFor(\ast\flags\USE_NORMAL, $non_generic_partially_qualified_array_type_name)) {
$fqsen = $context->getNamespaceMapFor(\ast\flags\USE_NORMAL, $non_generic_partially_qualified_array_type_name);
if ($is_generic_array_type) {
return GenericArrayType::fromElementType(Type::make($fqsen->getNamespace(), $fqsen->getName(), $template_parameter_type_list));
}
return Type::make($fqsen->getNamespace(), $fqsen->getName(), $template_parameter_type_list);
}
// If this was a fully qualified type, we're all
// set
if (!empty($namespace) && 0 === strpos($namespace, '\\')) {
return self::make($namespace, $type_name, $template_parameter_type_list);
}
if ($is_generic_array_type && self::isNativeTypeString($type_name)) {
return self::fromInternalTypeName($type_name);
} else {
// Check to see if its a builtin type
switch (strtolower(self::canonicalNameFromName($type_name))) {
case 'array':
return \Phan\Language\Type\ArrayType::instance();
case 'bool':
return \Phan\Language\Type\BoolType::instance();
case 'callable':
return \Phan\Language\Type\CallableType::instance();
case 'float':
return \Phan\Language\Type\FloatType::instance();
case 'int':
return \Phan\Language\Type\IntType::instance();
case 'mixed':
return \Phan\Language\Type\MixedType::instance();
case 'null':
return \Phan\Language\Type\NullType::instance();
case 'object':
return \Phan\Language\Type\ObjectType::instance();
case 'resource':
return \Phan\Language\Type\ResourceType::instance();
case 'string':
return \Phan\Language\Type\StringType::instance();
case 'void':
return \Phan\Language\Type\VoidType::instance();
case 'static':
return \Phan\Language\Type\StaticType::instance();
}
}
// Things like `self[]` or `$this[]`
if ($is_generic_array_type && self::isSelfTypeString($non_generic_array_type_name) && $context->isInClassScope()) {
// Callers of this method should be checking on their own
// to see if this type is a reference to 'parent' and
// dealing with it there. We don't want to have this
// method be dependent on the code base
assert('parent' !== $non_generic_array_type_name, __METHOD__ . " does not know how to handle the type name 'parent'");
return GenericArrayType::fromElementType(static::fromFullyQualifiedString((string) $context->getClassFQSEN()));
}
// If this is a type referencing the current class
// in scope such as 'self' or 'static', return that.
if (self::isSelfTypeString($type_name) && $context->isInClassScope()) {
// Callers of this method should be checking on their own
// to see if this type is a reference to 'parent' and
// dealing with it there. We don't want to have this
// method be dependent on the code base
assert('parent' !== $type_name, __METHOD__ . " does not know how to handle the type name 'parent'");
return static::fromFullyQualifiedString((string) $context->getClassFQSEN());
}
// Merge the current namespace with the given relative
// namespace
if (!empty($context->getNamespace()) && !empty($namespace)) {
$namespace = $context->getNamespace() . '\\' . $namespace;
} else {
if (!empty($context->getNamespace())) {
$namespace = $context->getNamespace();
} else {
$namespace = '\\' . $namespace;
}
}
// Attach the context's namespace to the type name
return self::make($namespace, $type_name, $template_parameter_type_list);
}
/**
* @param string $string
* A string representing a type
*
* @param Context $context
* The context in which the type string was
* found
*
* @return Type
* Parse a type from the given string
*/
public static function fromStringInContext(string $string, Context $context) : Type
{
assert($string !== '', "Type cannot be empty in {$context}");
$namespace = null;
// Extract the namespace if the type string is
// fully-qualified
if ('\\' === $string[0]) {
list($namespace, $string) = self::namespaceAndTypeFromString($string);
}
$type_name = strtolower($string);
// Check to see if the type name is mapped via
// a using clause.
//
// Gotta check this before checking for native types
// because there are monsters out there that will
// remap the names via things like `use \Foo\String`.
if ($context->hasNamespaceMapFor(T_CLASS, $type_name)) {
$fqsen = $context->getNamespaceMapFor(T_CLASS, $type_name);
return new Type($fqsen->getNamespace(), $fqsen->getName());
}
// If this was a fully qualified type, we're all
// set
if (!empty($namespace)) {
return self::fromNamespaceAndName($namespace, $type_name);
}
// Check to see if its a builtin type
switch (self::canonicalNameFromName($type_name)) {
case 'array':
return \Phan\Language\Type\ArrayType::instance();
case 'bool':
return \Phan\Language\Type\BoolType::instance();
case 'callable':
return \Phan\Language\Type\CallableType::instance();
case 'float':
return \Phan\Language\Type\FloatType::instance();
case 'int':
return \Phan\Language\Type\IntType::instance();
case 'mixed':
return \Phan\Language\Type\MixedType::instance();
case 'null':
return \Phan\Language\Type\NullType::instance();
case 'object':
return \Phan\Language\Type\ObjectType::instance();
case 'resource':
return \Phan\Language\Type\ResourceType::instance();
case 'string':
return \Phan\Language\Type\StringType::instance();
case 'void':
return \Phan\Language\Type\VoidType::instance();
}
// If this is a type referencing the current class
// in scope such as 'self' or 'static', return that.
if (self::isSelfTypeString($type_name) && $context->isInClassScope()) {
return static::fromFullyQualifiedString((string) $context->getClassFQSEN());
}
// Attach the context's namespace to the type name
return self::fromNamespaceAndName($context->getNamespace() ?: '\\', $type_name);
}
/**
* @return Parameter
* A parameter built from a node
*
* @see \Phan\Deprecated\Pass1::node_param
* Formerly `function node_param`
*/
public static function fromNode(Context $context, CodeBase $code_base, Node $node) : Parameter
{
assert($node instanceof Node, "node was not an \\ast\\Node");
// Get the type of the parameter
$union_type = UnionType::fromNode($context, $code_base, $node->children['type']);
// Create the skeleton parameter from what we know so far
$parameter = new Parameter($context, (string) $node->children['name'], $union_type, $node->flags ?? 0);
// If there is a default value, store it and its type
if (($default_node = $node->children['default']) !== null) {
// We can't figure out default values during the
// parsing phase, unfortunately
if (!$default_node instanceof Node || $default_node->kind == \ast\AST_CONST || $default_node->kind == \ast\AST_UNARY_OP || $default_node->kind == \ast\AST_ARRAY) {
// Get the type of the default
$union_type = UnionType::fromNode($context, $code_base, $default_node);
// Set the default value
$parameter->setDefaultValueType($union_type);
} else {
try {
// Get the type of the default
$union_type = UnionType::fromNode($context, $code_base, $default_node, false);
} catch (IssueException $exception) {
// If we're in the parsing phase and we
// depend on a constant that isn't yet
// defined, give up and set it to
// bool|float|int|string to avoid having
// to handle a future type.
$union_type = new UnionType([BoolType::instance(), FloatType::instance(), IntType::instance(), StringType::instance()]);
}
// Set the default value
$parameter->setDefaultValueType($union_type);
}
}
return $parameter;
}
/**
* @param UnionType $target
* A type to check to see if this can cast to it
*
* @return bool
* True if this type is allowed to cast to the given type
* i.e. int->float is allowed while float->int is not.
*
* @see \Phan\Deprecated\Pass2::type_check
* Formerly 'function type_check'
*/
public function canCastToUnionType(UnionType $target) : bool
{
// Fast-track most common cases first
// If either type is unknown, we can't call it
// a success
if ($this->isEmpty() || $target->isEmpty()) {
return true;
}
// T === T
if ($this->isEqualTo($target)) {
return true;
}
if (Config::get()->null_casts_as_any_type) {
// null <-> null
if ($this->isType(NullType::instance()) || $target->isType(NullType::instance())) {
return true;
}
}
// mixed <-> mixed
if ($target->hasType(MixedType::instance()) || $this->hasType(MixedType::instance())) {
return true;
}
// int -> float
if ($this->isType(IntType::instance()) && $target->isType(FloatType::instance())) {
return true;
}
// Check conversion on the cross product of all
// type combinations and see if any can cast to
// any.
foreach ($this->getTypeList() as $source_type) {
if (empty($source_type)) {
continue;
}
foreach ($target->getTypeList() as $target_type) {
if (empty($target_type)) {
continue;
}
if ($source_type->canCastToType($target_type)) {
return true;
}
}
}
// Only if no source types can be cast to any target
// types do we say that we cannot perform the cast
return false;
}
/**
* Visit a node with kind `\ast\AST_CAST`
*
* @param Node $node
* A node of the type indicated by the method name that we'd
* like to figure out the type that it produces.
*
* @return UnionType
* The set of types that are possibly produced by the
* given node
*/
public function visitCast(Node $node) : UnionType
{
// TODO: Check if the cast is allowed based on the right side type
UnionType::fromNode($this->context, $this->code_base, $node->children['expr']);
switch ($node->flags) {
case \ast\flags\TYPE_NULL:
return NullType::instance()->asUnionType();
case \ast\flags\TYPE_BOOL:
return BoolType::instance()->asUnionType();
case \ast\flags\TYPE_LONG:
return IntType::instance()->asUnionType();
case \ast\flags\TYPE_DOUBLE:
return FloatType::instance()->asUnionType();
case \ast\flags\TYPE_STRING:
return StringType::instance()->asUnionType();
case \ast\flags\TYPE_ARRAY:
return ArrayType::instance()->asUnionType();
case \ast\flags\TYPE_OBJECT:
return ObjectType::instance()->asUnionType();
default:
throw new NodeException($node, 'Unknown type (' . $node->flags . ') in cast');
}
}
