public static Equation Build(string e)
{
e = e.Trim();
Equation n = new Equation();
Equation p = new Equation();
int a = 0;
int z = 0;
string s = "";
foreach (char c in e)
{
if (c.EqualsAny('(', '['))
{
a += 1;
}
else if (c.EqualsAny(')', ']'))
{
z += 1;
}
}
if (a.Equals(z))
{
foreach (char c in e)
{
if (c.IsSolvable())
{
if (s != "")
{
if (s.EndsWith("0"))
{
if (s.Length == 1)
{
if (c.IsDigit())
{
s = "" + c;
continue;
}
}
else
{
if (s[s.Length - 2].IsOperator())
{
if (c.IsDigit())
{
s = s.ReplaceEnd(c);
continue;
}
}
}
}
if (s.EndsWith("/0"))
{
if (c.IsOperator())
{
s = "";
n = n.Throw("divide_by_zero");
break;
}
}
if (new char[] { c, s[s.Length - 1] }.AreOperators())
{
s = "";
n = n.Throw("invalid_operator_usage");
break;
}
}
s += c;
continue;
}
else if (c.EqualsAny('(', '['))
{
if (s != "")
{
if (s[s.LengthAsIndex()].IsAlphanumeric())
{
s += "*";
}
if (s.EndsWith("/0"))
{
s = "";
n = n.Throw("divide_by_zero");
break;
}
}
s += $"[{n.Layer + 1}, {n.Children.Count}]";
s.Debug($"[Opening a new equation in {n.Index()}...]");
n.Conjoin(s);
p = n;
n = new Equation(p);
p.Adopt(n);
s.Debug($"[Set {n.Index()} in layer {p.Layer}.]");
s = "";
continue;
}
else if (c.EqualsAny(')', ']'))
{
if (s.EndsWith("/0"))
{
s = "";
n = n.Throw("divide_by_zero");
break;
}
n.Value += s;
if (n.HasValue())
{
Debugger.Write("[No property was written. Setting to null...]");
n.Assign("null");
}
n.Value.Debug($"[Closing {n.Index()}...]");
n = n.Parent;
s = "";
continue;
}
}
if (s != "")
{
if (s.EndsWith("/0"))
{
s = "";
n = n.Throw("divide_by_zero");
}
else
{
n.Conjoin(s);
n.Value.Debug($"[Extending {n.Index()}...]");
}
}
}
else
{
Debugger.Write("[Incorrect equation structure. Now cancelling...]");
n.Throw("invalid_equation_structure");
}
n = n.GetRootParent();
return(n);
}
public void Abandon(Equation child) => Children.Remove(child);
public Equation(Equation parent)
{
Parent = parent;
Layer = Parent.Layer + 1;
Position = Parent.Children.Count;
}
public void Adopt(Equation child) => Children.Add(child);
