protected override ExpressionBase Combine(ExpressionBase left, ExpressionBase right)
{
if (left == null)
{
return(right);
}
var combined = new MathematicExpression(left, MathematicOperation.Add, right);
return(combined.MergeOperands());
}
private static bool MergeFields(Field field, Term term, MathematicOperation operation)
{
ExpressionBase right;
if (field.Type == FieldType.Value)
{
right = new IntegerConstantExpression((int)field.Value);
}
else if (field.Type == FieldType.Float)
{
right = new FloatConstantExpression(field.Float);
}
else
{
return(false);
}
ExpressionBase left = null;
if (term.multiplier == 1.0)
{
if (term.field.Type == FieldType.Value)
{
left = new IntegerConstantExpression((int)term.field.Value);
}
else if (term.field.Type == FieldType.Float)
{
left = new FloatConstantExpression(term.field.Float);
}
}
if (left == null)
{
FloatConstantExpression floatRight;
switch (operation)
{
case MathematicOperation.Multiply:
floatRight = FloatConstantExpression.ConvertFrom(right) as FloatConstantExpression;
if (floatRight == null)
{
return(false);
}
term.multiplier *= floatRight.Value;
return(true);
case MathematicOperation.Divide:
floatRight = FloatConstantExpression.ConvertFrom(right) as FloatConstantExpression;
if (floatRight == null)
{
return(false);
}
term.multiplier /= floatRight.Value;
return(true);
default:
return(false);
}
}
var mathematicExpression = new MathematicExpression(left, operation, right);
term.field = AchievementBuilder.CreateFieldFromExpression(mathematicExpression.MergeOperands());
return(true);
}