/**
* Visit a node with kind `\ast\AST_FUNC_DECL`
*
* @param Node $node
* A node to parse
*
* @return Context
* A new or an unchanged context resulting from
* parsing the node
*/
public function visitFuncDecl(Decl $node) : Context
{
$method = $this->context->getMethodInScope($this->code_base);
$return_type = $method->getUnionType();
if (!$return_type->isEmpty() && !$method->getHasReturn() && !$return_type->hasType(VoidType::instance()) && !$return_type->hasType(NullType::instance())) {
Issue::emit(Issue::TypeMissingReturn, $this->context->getFile(), $node->lineno ?? 0, $method->getFQSEN(), (string) $return_type);
}
return $this->context;
}
/**
* @param Node $node
* A node to parse
*
* @return Context
* A new or an unchanged context resulting from
* parsing the node
*/
public function visitMethod(Decl $node) : Context
{
$method = $this->context->getMethodInScope($this->code_base);
$return_type = $method->getUnionType();
$has_interface_class = false;
if ($method->getFQSEN() instanceof FullyQualifiedMethodName) {
try {
$class = $method->getDefiningClass($this->code_base);
$has_interface_class = $class->isInterface();
} catch (\Exception $exception) {
}
}
if (!$method->isAbstract() && !$has_interface_class && !$return_type->isEmpty() && !$method->getHasReturn() && !$return_type->hasType(VoidType::instance()) && !$return_type->hasType(NullType::instance())) {
Log::err(Log::ETYPE, "Method {$method->getFQSEN()} is declared to return {$return_type} but has no return value", $this->context->getFile(), $node->lineno);
}
return $this->context;
}
/**
* @param Node $node
* A node to parse
*
* @return Context
* A new or an unchanged context resulting from
* parsing the node
*/
public function visitMethod(Decl $node) : Context
{
$method = $this->context->getMethodInScope($this->code_base);
$return_type = $method->getUnionType();
$has_interface_class = false;
if ($method->getFQSEN() instanceof FullyQualifiedMethodName) {
try {
$class = $method->getDefiningClass($this->code_base);
$has_interface_class = $class->isInterface();
} catch (\Exception $exception) {
}
}
if (!$method->isAbstract() && !$has_interface_class && !$return_type->isEmpty() && !$method->getHasReturn() && !$return_type->hasType(VoidType::instance()) && !$return_type->hasType(NullType::instance())) {
Issue::emit(Issue::TypeMissingReturn, $this->context->getFile(), $node->lineno ?? 0, $method->getFQSEN(), (string) $return_type);
}
return $this->context;
}
/**
* @param Node $node
* A node to parse
*
* @return Context
* A new or an unchanged context resulting from
* parsing the node
*/
public function visitReturn(Node $node) : Context
{
// Don't check return types in traits
if ($this->context->isInClassScope()) {
$clazz = $this->context->getClassInScope($this->code_base);
if ($clazz->isTrait()) {
return $this->context;
}
}
// Make sure we're actually returning from a method.
if (!$this->context->isMethodScope() && !$this->context->isClosureScope()) {
return $this->context;
}
// Get the method/function/closure we're in
$method = null;
if ($this->context->isClosureScope()) {
$method = $this->context->getClosureInScope($this->code_base);
} else {
if ($this->context->isMethodScope()) {
$method = $this->context->getMethodInScope($this->code_base);
} else {
assert(false, "We're supposed to be in either method or closure scope.");
}
}
// Figure out what we intend to return
$method_return_type = $method->getUnionType();
// Figure out what is actually being returned
$expression_type = UnionType::fromNode($this->context, $this->code_base, $node->children['expr']);
// If there is no declared type, see if we can deduce
// what it should be based on the return type
if ($method_return_type->isEmpty() || $method->isReturnTypeUndefined()) {
$method->setIsReturnTypeUndefined(true);
// Set the inferred type of the method based
// on what we're returning
$method->getUnionType()->addUnionType($expression_type);
// No point in comparing this type to the
// type we just set
return $this->context;
}
if (!$method->isReturnTypeUndefined() && !$expression_type->canCastToExpandedUnionType($method_return_type, $this->code_base)) {
Log::err(Log::ETYPE, "return {$expression_type} but {$method->getName()}() is declared to return {$method_return_type}", $this->context->getFile(), $node->lineno);
}
return $this->context;
}
