private void QueuePendingOperation()
{
Debug.Assert(IsFormulaBeingConstructed());
Debug.Assert(pendingOp.HasValue);
switch (pendingOp.Value)
{
case Operation.ADD:
root = new Model.Add(root, new Model.Value(inputField.Value));
break;
case Operation.SUBSTRACT:
root = new Model.Substract(root, new Model.Value(inputField.Value));
break;
case Operation.MULTIPLY:
root = new Model.Multiply(root, new Model.Value(inputField.Value));
break;
case Operation.DIVIDE:
root = new Model.Divide(root, new Model.Value(inputField.Value));
break;
default:
throw new InvalidOperationException();
}
}
public Divide(Evaluable v1, Evaluable v2)
{
this.v1 = v1;
this.v2 = v2;
}
public Multiply(Evaluable v1, Evaluable v2)
{
this.v1 = v1;
this.v2 = v2;
}
private void ResetStateMachine()
{
root = null;
pendingOp = null;
}
private void QueueInitialValue()
{
Debug.Assert(!IsFormulaBeingConstructed());
root = new Model.Value(inputField.Value);
}
