TypePtr DeclarationAnalyzer::defineType(const std::shared_ptr<TypeDeclaration>& node)
{
TypeIdentifierPtr id = node->getIdentifier();
//Analyze the type's category
Type::Category category;
switch(node->getNodeType())
{
case NodeType::Enum:
category = Type::Enum;
break;
case NodeType::Class:
category = Type::Class;
break;
case NodeType::Struct:
category = Type::Struct;
break;
case NodeType::Protocol:
category = Type::Protocol;
break;
default:
assert(0 && "Impossible to execute here.");
}
//it's inside the type's scope, so need to access parent scope;
//prepare for generic types
GenericParametersDefPtr genericParams = node->getGenericParametersDef();
//check if it's defined as a nested type
if(ctx->currentType)
{
if(genericParams)
{
error(node, Errors::E_GENERIC_TYPE_A_NESTED_IN_TYPE_B_IS_NOT_ALLOWED_2, id->getName(), ctx->currentType->getName());
return nullptr;
}
if(ctx->currentType->isGenericType())
{
error(node, Errors::E_TYPE_A_NESTED_IN_GENERIC_TYPE_B_IS_NOT_ALLOWED_2, id->getName(), ctx->currentType->getName());
return nullptr;
}
}
//register this type
SymbolScope* currentScope = symbolRegistry->getCurrentScope();
TypeBuilderPtr type = static_pointer_cast<TypeBuilder>(currentScope->getForwardDeclaration(id->getName()));
S_ASSERT(type == nullptr);
type = static_pointer_cast<TypeBuilder>(Type::newType(id->getName(), category));
currentScope->addForwardDeclaration(type);
TypeDeclarationPtr tnode = dynamic_pointer_cast<TypeDeclaration>(node);
type->setReference(tnode);
if(tnode)
tnode->setType(type);
assert(type != nullptr);
assert(type->getCategory() == category);
//prepare for generic
if(!type->getGenericDefinition() && node->getGenericParametersDef())
{
GenericParametersDefPtr genericParams = node->getGenericParametersDef();
GenericDefinitionPtr generic = prepareGenericTypes(genericParams);
generic->registerTo(type->getScope());
type->setGenericDefinition(generic);
}
if(node->hasModifier(DeclarationModifiers::Final))
type->setFlags(SymbolFlagFinal, true);
static_pointer_cast<TypeBuilder>(type)->setModuleName(ctx->currentModule->getName());
ctx->allTypes.push_back(type);
//check inheritance clause
{
TypePtr parent = nullptr;
bool first = true;
ScopeGuard scope(symbolRegistry, type->getScope());
SCOPED_SET(ctx->currentType, type);
for(const TypeIdentifierPtr& parentType : node->getParents())
{
parentType->accept(this);
if(first)
declareImmediately(parentType->getName());
TypePtr ptr = resolveType(parentType, true);
Type::Category pcategory = ptr->getCategory();
if(pcategory == Type::Specialized)
pcategory = ptr->getInnerType()->getCategory();
if(pcategory == Type::Class && category == Type::Class)
{
if(!first)
{
//only the first type can be class type
error(parentType, Errors::E_SUPERCLASS_MUST_APPEAR_FIRST_IN_INHERITANCE_CLAUSE_1, toString(parentType));
return nullptr;
}
parent = ptr;
if(parent->hasFlags(SymbolFlagFinal))
{
error(parentType, Errors::E_INHERITANCE_FROM_A_FINAL_CLASS_A_1, parentType->getName());
return nullptr;
}
}
else if(category == Type::Enum && pcategory != Type::Protocol)
{
if(parent)//already has a raw type
{
error(parentType, Errors::E_MULTIPLE_ENUM_RAW_TYPES_A_AND_B_2, parent->toString(), ptr->toString());
return nullptr;
}
if(!first)
{
error(parentType, Errors::E_RAW_TYPE_A_MUST_APPEAR_FIRST_IN_THE_ENUM_INHERITANCE_CLAUSE_1, ptr->toString());
return nullptr;
}
//check if the raw type is literal convertible
if(!isLiteralTypeForEnum(symbolRegistry->getGlobalScope(), ptr))
{
error(parentType, Errors::E_RAW_TYPE_A_IS_NOT_CONVERTIBLE_FROM_ANY_LITERAL_1, ptr->toString());
return nullptr;
}
if(!ptr->canAssignTo(symbolRegistry->getGlobalScope()->Equatable()))
{
error(parentType, Errors::E_RAWREPRESENTABLE_INIT_CANNOT_BE_SYNTHESIZED_BECAUSE_RAW_TYPE_A_IS_NOT_EQUATABLE_1, ptr->toString());
return nullptr;
}
parent = ptr;
}
else if(pcategory == Type::Protocol)
{
type->addProtocol(ptr);
}
else
{
if(category == Type::Class)
error(parentType, Errors::E_INHERITANCE_FROM_NONE_PROTOCOL_NON_CLASS_TYPE_1, toString(parentType));
else
error(parentType, Errors::E_INHERITANCE_FROM_NONE_PROTOCOL_TYPE_1, toString(parentType));
return nullptr;
}
first = false;
}
type->setParentType(parent);
if(parent && parent->getAccessLevel() == AccessLevelPublic && (node->getModifiers() & DeclarationModifiers::AccessModifiers) == 0)
type->setAccessLevel(AccessLevelPublic);//when access level is undefined, try to inherit base's access level
else
type->setAccessLevel(parseAccessLevel(node->getModifiers()));
}
declarationFinished(type->getName(), type, node);
return type;
}
void DeclarationAnalyzer::visitEnum(const EnumDefPtr& node)
{
if(isLazyDeclared(node))
return;
TypeBuilderPtr type = static_pointer_cast<TypeBuilder>(getOrDefineType(node));
ScopeGuard scope(symbolRegistry, type->getScope());
SCOPED_SET(ctx->currentType, type);
SCOPED_SET(ctx->currentExtension, nullptr);
SCOPED_SET(ctx->currentFunction, nullptr);
GlobalScope* global = symbolRegistry->getGlobalScope();
SymbolScope* local = symbolRegistry->getCurrentScope();
//check if it's raw value enum
bool isRawValues = false;
if(node->numParents() > 0)
{
TypePtr firstParent = lookupType(node->getParent(0));
if(firstParent)
{
Type::Category category = firstParent->getCategory();
isRawValues = category == Type::Struct || category == Type::Enum || category == Type::Aggregate || category == Type::Class;
if(isRawValues)
type->setParentType(firstParent);
}
}
//initialize enum's cases
if(isRawValues)
{
if(!node->numCases())
{
error(node, Errors::E_ENUM_WITH_NO_CASES_CANNOT_DECLARE_A_RAW_TYPE);
return;
}
//Add RawRepresentable protocol if it's not implemented
if(!type->canAssignTo(global->RawRepresentable()))
{
makeRawRepresentable(type, global);
}
TypePtr rawType = type->getParentType();
assert(rawType != nullptr);
bool integerConvertible = rawType->canAssignTo(global->IntegerLiteralConvertible());
for(auto c : node->getCases())
{
if(!c.value && !integerConvertible)
{
//Enum cases require explicit raw values when the raw type is not integer literal convertible
error(node, Errors::E_ENUM_CASES_REQUIRE_EXPLICIT_RAW_VALUES_WHEN_THE_RAW_TYPE_IS_NOT_INTEGER_LITERAL_CONVERTIBLE);
return;
}
if(c.value)
{
if(dynamic_pointer_cast<TupleType>(c.value))
{
error(node, Errors::E_ENUM_WITH_RAW_TYPE_CANNOT_HAVE_CASES_WITH_ARGUMENTS);
return;
}
}
type->addEnumCase(c.name, global->Void());
//register it to scope
local->addSymbol(SymbolPlaceHolderPtr(new SymbolPlaceHolder(c.name, type, SymbolPlaceHolder::R_PARAMETER, SymbolFlagReadable | SymbolFlagMember | SymbolFlagStatic | SymbolFlagInitialized)));
}
}
else
{
//it's an associated-values enum
for(auto c : node->getCases())
{
TypePtr associatedType = global->Void();
if(c.value)
{
TypeNodePtr typeNode = dynamic_pointer_cast<TypeNode>(c.value);
if(!typeNode)
{
error(node, Errors::E_ENUM_CASE_CANNOT_HAVE_A_RAW_VALUE_IF_THE_ENUM_DOES_NOT_HAVE_A_RAW_TYPE);
return;
}
assert(typeNode != nullptr);
associatedType = resolveType(typeNode, true);
}
type->addEnumCase(c.name, associatedType);
if(associatedType == global->Void())
local->addSymbol(SymbolPlaceHolderPtr(new SymbolPlaceHolder(c.name, type, SymbolPlaceHolder::R_PARAMETER, SymbolFlagReadable | SymbolFlagMember | SymbolFlagStatic | SymbolFlagInitialized)));
}
}
//check member declaration of enum
{
SCOPED_SET(ctx->flags, (ctx->flags & (~SemanticContext::FLAG_PROCESS_IMPLEMENTATION)) | SemanticContext::FLAG_PROCESS_DECLARATION);
for (const DeclarationPtr &decl : *node)
{
bool isStatic = decl->hasModifier(DeclarationModifiers::Class) || decl->hasModifier(DeclarationModifiers::Static);
if (!isStatic && (decl->getNodeType() == NodeType::ValueBindings))
{
error(node, Errors::E_ENUMS_MAY_NOT_CONTAIN_STORED_PROPERTIES);
continue;
}
decl->accept(this);
}
//add a default initializer for raw value enum
if(isRawValues)
{
vector<Parameter> params = {Parameter(L"rawValue", false, type->getParentType())};
TypePtr initType = Type::newFunction(params, global->Void(), false, nullptr);
initType->setFlags(SymbolFlagAllocatingInit, true);
static_pointer_cast<TypeBuilder>(initType)->setDeclaringType(type);
initType->setFlags(SymbolFlagInit | SymbolFlagFailableInitializer | SymbolFlagMember | SymbolFlagAllocatingInit);
FunctionSymbolPtr init(new FunctionSymbol(L"init", initType, FunctionRoleInit, nullptr));
declarationFinished(init->getName(), init, nullptr);
}
}
if(type->getParentType() != nullptr)
verifyAccessLevel(node, type->getParentType(), DeclarationTypeEnum, ComponentTypeRawType);
validateDeclarationModifiers(node);
//visitImplementation(node);
}