public override void VisitFunction(FunctionExpression functionExpression)
{
if (functionExpression.Function == Operators.Plus)
{
Visit(functionExpression[0]);
}
else if (functionExpression.Function == Operators.Negate)
{
SumAggregator aggregator = new SumAggregator();
aggregator.Visit(functionExpression[0]);
Append(aggregator, true);
}
else if (functionExpression.Function == Operators.Add)
{
foreach (Expression argument in functionExpression)
{
Visit(argument);
}
}
else if (functionExpression.Function == Operators.Subtract)
{
Visit(functionExpression[0]);
SumAggregator aggregator = new SumAggregator();
aggregator.Visit(functionExpression[1]);
Append(aggregator, true);
}
else if (functionExpression.Function == Operators.Multiply || functionExpression.Function == Operators.Divide)
{
ProductAggregator aggregator = new ProductAggregator();
aggregator.Visit(functionExpression);
Expression expression = aggregator.ToExpression();
FunctionExpression functionExpression1 = expression as FunctionExpression;
if (functionExpression1 != null && (functionExpression1.Function == Operators.Multiply || functionExpression1.Function == Operators.Divide))
{
AddExpression(expression);
}
else
{
Visit(expression);
}
}
else
{
AddExpression(functionExpression);
}
}
private void Append(SumAggregator aggregator, bool invert)
{
if (invert)
{
_value -= aggregator._value;
}
else
{
_value += aggregator._value;
}
IEnumerable <Addent> addents = aggregator._addents;
if (invert)
{
addents = addents.Select(a => a.Negate());
}
_addents = _addents.AddRange(addents);
}