public static Expression InverseExpression(Expression exp)
{
Expression ret = new VariableExpression();
Expression s = exp;
do
{
ret = s.GenerateInverse(ret);
foreach (var i in s.Children)
if (i.HasVariable)
{
s = i;
break;
}
}
while (!(s is VariableExpression));
return ret;
}
internal Expression Generate(Expression parent, int level, Random rand)
{
Expression ret = null;
if (level == 0)
{
if (!g)
{
ret = new VariableExpression();
g = true;
}
else
{
ret = new ConstantExpression();
ret.Generate(this, level, rand);
}
}
else
{
ret = (Expression)Activator.CreateInstance(ExpressionTypes[rand.Next(0, ExpressionTypes.Length)]);
ret.Generate(this, level - 1, rand);
}
ret.Parent = parent;
return ret;
}