public static ICFunction CreateNode(string label, NodeLabelCallback callBack)
{
label = removeWhitespace(label);
ICFunction ret;
// if it has an '=' then it's a variable.
// Rearrange X = Y into Var(X,Y) format.
if (label.Contains("="))
{
string[] pars = label.Split(new char[] { '=' });
label = "Var(" + pars[0] + "," + pars[1] + ")";
}
// Split on first '('
string[] split = label.Split(new char[] { '(' }, 2);
ret = GetFunctionFromLabel(split[0]);
// If null, then it's either a constant or node.
if (split.Length < 2 || ret == null)
{
ret = ConstantFunction.CreateConstantFunction(label, split[0]);
if (ret != null)
{
return(AddNodeToList(ret));
}
ret = OutsourcedFunction.CreateOutsourcedFunction(split[0], callBack);
if (ret != null)
{
return(AddNodeToList(ret));
}
}
// Now need to find children represented by remainder of split: split[1]
// eg "4,5,Sub(3,4))"
List <ICFunction> children = new List <ICFunction>();
string child = "";
int relevance = 0;
foreach (char c in split[1])
{
if (c == '(')
{
relevance++;
}
if (c == ')')
{
relevance--;
}
child += c;
if (relevance == 0)
{
if (c == ')')
{
child = child.TrimEnd(new char[] { ')' });
if (child.Length > 0)
{
ICFunction icf = CreateNode(child, callBack);
children.Add(icf);
}
child = "";
}
if (c == ',')
{
child = child.TrimEnd(new char[] { ',' });
if (child.Length > 0)
{
ICFunction icf = CreateNode(child, callBack);
children.Add(icf);
}
child = "";
}
}
}
child = child.TrimEnd(new char[] { ',', ')' });
if (child.Length > 0)
{
ICFunction icff = CreateNode(child, callBack);
children.Add(icff);
}
ret.Children = children;
return(AddNodeToList(ret));
}