@Override
public TypeResult<StatementTypeCheckResult> typeCheck(
ReturnNode returnStatement, Option<Type> returnType) {
TypeResultBuilder<StatementTypeCheckResult> typeResult =
typeResultBuilder(StatementTypeCheckResult.alwaysReturns());
ExpressionNode expression = returnStatement.getExpression();
TypeResult<Type> expressionTypeResult = typeInferer.inferType(expression);
typeResult.addErrors(expressionTypeResult);
if (!returnType.hasValue()) {
typeResult.addError(error(returnStatement, new CannotReturnHereError()));
} else if (expressionTypeResult.hasValue()
&& !subTyping.isSubType(expressionTypeResult.getOrThrow(), returnType.get())) {
typeResult.addError(
error(
expression,
new WrongReturnTypeError(returnType.get(), expressionTypeResult.getOrThrow())));
}
return typeResult.build();
}
private TypeResult<StatementTypeCheckResult> typeCheck(
FunctionSignatureDeclarationNode declaration) {
return typeChecker().typeCheck(declaration, Option.<Type>none());
}
public static ValueInfo assignableValue(Type type) {
return new ValueInfo(type, Status.ASSIGNABLE, Option.<ShedValue>none());
}