public void Evaluate(string exp)
{
ExpressionBuilder expBuilder = new ExpressionBuilder();
// build the exp form the input string
IEvaluableExp evaluableExp = expBuilder.BuildExp(exp, m_EnvironmentVars);
// update new var
m_EnvironmentVars[expBuilder.Variable] = evaluableExp.GetEvaluateExpValue();
}
public int GetEvaluateExpValue()
{
var leftValue = m_LeftExp.GetEvaluateExpValue();
var rightValue = m_RightExp.GetEvaluateExpValue();
switch (c_Op)
{
case OpEnum.Add:
return(leftValue + rightValue);
case OpEnum.Sub:
return(leftValue - rightValue);
case OpEnum.Mul:
return(leftValue * rightValue);
default:
throw new InvalidExpressionException();
}
}