public static EvaluationResult Evaluate(ParseTreeNode node, IRootEvaluator rootEvaluator)
{
var arg1 = rootEvaluator.Evaluate(node.ChildNodes[0]);
var operNode = node.ChildNodes[1];
var oper = operNode.Token.Value as string;
var arg2 = rootEvaluator.Evaluate(node.ChildNodes[2]);
if (arg1.HasError)
return arg1;
if (arg2.HasError)
return arg2;
try
{
if (oper == "+" && arg1.Result is int && arg2.Result is int)
return DoOperAdd((int)arg1.Result, (int)arg2.Result);
if (oper == "-" && arg1.Result is int && arg2.Result is int)
return DoOperMinus((int)arg1.Result, (int)arg2.Result);
if (oper == "*" && arg1.Result is int && arg2.Result is int)
return DoOperMul((int)arg1.Result, (int)arg2.Result);
if (oper == "/" && arg1.Result is int && arg2.Result is int)
return DoOperDiv((int)arg1.Result, (int)arg2.Result, operNode);
}
catch (ArithmeticException)
{
return new EvaluationResult(SimpleExpressionEvaluator.OverflowMessage,
operNode.Span.Location.Position);
}
throw new NotSupportedException(string.Format(SimpleExpressionEvaluator.OperationNotSupported, oper));
}
public static EvaluationResult Evaluate(ParseTreeNode node, IRootEvaluator rootEvaluator)
{
var sing = node.ChildNodes[0].Token.Value as string;
var arg = rootEvaluator.Evaluate(node.ChildNodes[1]);
if (arg.HasError)
return arg;
if (sing == "-")
return new EvaluationResult(-(int)arg.Result);
if (sing == "+")
return arg;
throw new NotSupportedException(string.Format(SimpleExpressionEvaluator.OperationNotSupported, sing));
}