public static NodeItem ReadString(string input)
{
NodeItem node = new NodeItem();
if (string.IsNullOrEmpty(input))
{
return(GetEmpty());
}
node.IsEmpty = false;
node.IsEvalReady = int.TryParse(input, out int leftVal) | input == "x";
node.ParamString = input;
decimal val;
if (node.IsEvalReady && decimal.TryParse(input, out val))
{
node.ParamValue = val.ToString();
}
else
{
node.ParamValue = "";
}
return(node);
}
public static NodeItem GetEmpty()
{
NodeItem nodeItem = new NodeItem();
nodeItem.IsEmpty = true;
return(nodeItem);
}
public static EquationItem GetItem(string input, string variableValue, int parent, int level, int lastLevelId)
{
try
{
//Find First + sign
int plusIndex = input.IndexOf('+');
int minusIndex = input.IndexOf('-');
int timesIndex = input.IndexOf('*');
int cosineIndex = input.IndexOf("cos[");
int sinIndex = input.IndexOf("sin[");
//Resolve addition first
if (plusIndex != -1)
{
string[] arr = input.Split(new char[] { '+' }, 2);
if (arr.Length == 2)
{
EquationItem equationItem = new EquationItem();
equationItem.IsEmpty = false;
equationItem.Id = level * 10 + lastLevelId;
equationItem.Parent = parent;
equationItem.Level = level;
equationItem.Operation = "+";
equationItem.LeftNode = NodeItem.ReadString(arr[0]);
equationItem.RightNode = NodeItem.ReadString(arr[1]);
equationItem.VariableValue = variableValue;
return(equationItem);
}
}
//Resolve subtraction
if (minusIndex != -1)
{
string[] arr = input.Split(new char[] { '-' }, 2);
if (arr.Length == 2)
{
EquationItem equationItem = new EquationItem();
equationItem.IsEmpty = false;
equationItem.Id = level * 10 + lastLevelId;
equationItem.Parent = parent;
equationItem.Level = level;
equationItem.Operation = "-";
equationItem.LeftNode = NodeItem.ReadString(arr[0]);
equationItem.RightNode = NodeItem.ReadString(arr[1]);
equationItem.VariableValue = variableValue;
return(equationItem);
}
}
//Resolve multiplication
if (timesIndex != -1)
{
string[] arr = input.Split(new char[] { '*' }, 2);
if (arr.Length == 2)
{
EquationItem equationItem = new EquationItem();
equationItem.IsEmpty = false;
equationItem.Id = level * 10 + lastLevelId;
equationItem.Parent = parent;
equationItem.Level = level;
equationItem.Operation = "*";
equationItem.LeftNode = NodeItem.ReadString(arr[0]);
equationItem.RightNode = NodeItem.ReadString(arr[1]);
equationItem.VariableValue = variableValue;
return(equationItem);
}
}
//Resolve Cosine
if (cosineIndex != -1)
{
string cosParam = input?.Substring(cosineIndex).Split('[', ']')[1];
EquationItem equationItem = new EquationItem();
equationItem.IsEmpty = false;
equationItem.Id = level * 10 + lastLevelId;
equationItem.Parent = parent;
equationItem.Level = level;
equationItem.Operation = "cos";
equationItem.LeftNode = NodeItem.ReadString(cosParam);
equationItem.RightNode = NodeItem.ReadString(cosParam);
equationItem.VariableValue = variableValue;
return(equationItem);
}
//Resolve Sin
if (sinIndex != -1)
{
string sinParam = input?.Substring(sinIndex).Split('[', ']')[1];
EquationItem equationItem = new EquationItem();
equationItem.IsEmpty = false;
equationItem.Id = level * 10 + lastLevelId;
equationItem.Parent = parent;
equationItem.Level = level;
equationItem.Operation = "sin";
equationItem.LeftNode = NodeItem.ReadString(sinParam);
equationItem.RightNode = NodeItem.ReadString(sinParam);
equationItem.VariableValue = variableValue;
return(equationItem);
}
return(GetEmpty());
}
catch (System.Exception)
{
throw;
}
}
