private TypeDesc SimpleExpression(HashSet <SymbolEnum> followers)
{
bool hasPrefixSign = false;
if (CurrentSymbol == SymbolEnum.Minus || CurrentSymbol == SymbolEnum.Plus)
{
hasPrefixSign = true;
NextSymbol();
}
var firstOperandType = NeutralizerDecoratorWithReturn(Term, Starters.Term, Followers.Term, 6, followers);
if (hasPrefixSign)
{
if (!TypeValidator.SupportsSign(firstOperandType))
{
Error(211);
}
}
while (CurrentSymbol == SymbolEnum.Plus ||
CurrentSymbol == SymbolEnum.Minus ||
CurrentSymbol == SymbolEnum.OrSy)
{
var operation = CurrentSymbol;
NextSymbol();
var secondOperandType = NeutralizerDecoratorWithReturn(Term, Starters.Term, Followers.Term, 6, followers);
var expressionType = TypeValidator.GetTypeAfterAddition(firstOperandType, secondOperandType, operation);
if (expressionType == null)
{
Error(328);
}
return(expressionType);
}
return(firstOperandType);
}