public Node Clone()
{
Node newNode = null;
if (this is OperatorNode)
{
OperatorNode oldOperatorNode = (OperatorNode)this;
newNode = new OperatorNode();
OperatorNode newOperatorNode = (OperatorNode)newNode;
newOperatorNode.Operator = oldOperatorNode.Operator;
foreach (Node child in oldOperatorNode.Children)
{
Node newChild = child.Clone();
newChild.Parent = newOperatorNode;
newOperatorNode.Children.Add(newChild);
}
}
else if (this is NumericNode)
{
NumericNode oldNumericNode = (NumericNode)this;
newNode = new NumericNode();
NumericNode newNumericNode = (NumericNode)newNode;
newNumericNode.Number = oldNumericNode.Number;
}
else if (this is VariableNode)
{
VariableNode oldVariableNode = (VariableNode)this;
newNode = new VariableNode();
VariableNode newVariableNode = (VariableNode)newNode;
newVariableNode.Variable = oldVariableNode.Variable;
newVariableNode.VariableNodeType = oldVariableNode.VariableNodeType;
newVariableNode.Number = oldVariableNode.Number;
}
return(newNode);
}
public static Node RemoveDoubleNegatives(Node inNode)
{
Node workNode = inNode;
if (workNode is OperatorNode)
{
OperatorNode operatorNode = (OperatorNode)workNode;
if (operatorNode.Operator.OperatorString == "-" && operatorNode.Operator.OperatorType == OperatorType.Unary)
{
Node child = operatorNode.Children[0];
if (child is OperatorNode)
{
OperatorNode childOperatorNode = (OperatorNode)child;
if (childOperatorNode.Operator.OperatorString == "-" && childOperatorNode.Operator.OperatorType == OperatorType.Unary)
{
workNode = childOperatorNode.Children[0];
}
}
else if (child is NumericNode)
{
NumericNode childNumericNode = (NumericNode)child;
if (childNumericNode.Number < 0)
{
childNumericNode.Number *= -1;
workNode = childNumericNode;
}
}
}
}
List <Node> newChildren = new List <Node>();
foreach (Node child in workNode.Children)
{
Node newChild = RemoveDoubleNegatives(child);
newChild.Parent = workNode;
newChildren.Add(newChild);
}
workNode.Children = newChildren;
return(workNode);
}
public static Node ParseNewEnclosing(string inExpression, out bool foundOperator, List <Operator> operators)
{
foundOperator = false;
int openingBracketLocation = inExpression.IndexOf('(');
int closingBracketLocation = inExpression.Length - 1;
if (inExpression.Substring(closingBracketLocation, 1) != ")")
{
return(null);
}
if (openingBracketLocation >= 0)
{
foundOperator = true;
string keyword = inExpression.Substring(0, openingBracketLocation);
string wholeOperands = inExpression.Substring(openingBracketLocation + 1, inExpression.Length - openingBracketLocation - 2);
Operator commaOperator = new Operator(",", 0, OperatorType.Delimiting, null);
List <int> bracketDepths = Node.BracketDepths(wholeOperands);
bool foundOperator2 = false;
List <string> operands = Node.ParseDelimiting(wholeOperands, commaOperator, bracketDepths, out foundOperator2);
OperatorNode newNode = new OperatorNode();
Operator o = operators.FirstOrDefault(x => x.OperatorString == keyword);
if (o == null)
{
o = new Operator(keyword, operators.Count, OperatorType.Enclosing, null);
operators.Add(o);
}
newNode.Operator = o;
foreach (string operand in operands)
{
Node childNode = Parse(operand, operators);
childNode.Parent = newNode;
newNode.Children.Add(childNode);
}
return(newNode);
}
return(null);
}
public static string JoinNest(Node inNode, string useNumbers = "")
{
if (inNode is OperatorNode)
{
List <string> operandStrings = new List <string>();
OperatorNode operatorNode = (OperatorNode)inNode;
string operatorString = operatorNode.Operator.OperatorString;
foreach (Node child in inNode.Children)
{
string operandString = JoinNest(child, useNumbers);
if (child is OperatorNode)
{
OperatorNode childOperatorNode = (OperatorNode)child;
if (childOperatorNode.Operator.OperatorType == OperatorType.Delimiting)
{
string childOperatorString = childOperatorNode.Operator.OperatorString;
if (operatorString == "-")
{
if (operatorNode.Children[0] != childOperatorNode && operatorNode.Operator.OperatorType == OperatorType.Delimiting)
{
if (childOperatorString == "+" || childOperatorString == "-")
{
operandString = "(" + operandString + ")";
}
}
else if (operatorNode.Operator.OperatorType == OperatorType.Unary)
{
if (childOperatorString == "+" || childOperatorString == "-" || childOperatorString == "," || childOperatorString == "=")
{
operandString = "(" + operandString + ")";
}
}
}
else if (operatorString == "/")
{
if (childOperatorString == "+" || childOperatorString == "-" || childOperatorString == "," || childOperatorString == "=")
{
operandString = "(" + operandString + ")";
}
else if (operatorNode.Children[0] != childOperatorNode)
{
if (childOperatorString == "*" || childOperatorString == "/")
{
operandString = "(" + operandString + ")";
}
}
}
else if (operatorString == "*")
{
if (childOperatorString == "+" || childOperatorString == "-" || childOperatorString == "," || childOperatorString == "=")
{
operandString = "(" + operandString + ")";
}
}
else if (operatorString == "+")
{
if (childOperatorString == "," || childOperatorString == "=")
{
operandString = "(" + operandString + ")";
}
}
}
}
operandStrings.Add(operandString);
}
if (operatorNode.Operator.OperatorType == OperatorType.Delimiting)
{
string outString = string.Join(operatorNode.Operator.OperatorString, operandStrings.ToArray());
return(outString);
}
else if (operatorNode.Operator.OperatorType == OperatorType.Unary)
{
string outString = operatorNode.Operator.OperatorString + operandStrings[0];
return(outString);
}
else if (operatorNode.Operator.OperatorType == OperatorType.Enclosing)
{
string outString = operatorNode.Operator.OperatorString + "(" + string.Join(",", operandStrings.ToArray()) + ")";
return(outString);
}
}
else if (inNode is VariableNode)
{
VariableNode variableNode = (VariableNode)inNode;
if (useNumbers != "" && variableNode.Variable.Substring(0, useNumbers.Length) == useNumbers)
{
return(variableNode.Number.ToString().Trim());
}
return(variableNode.Variable);
}
else if (inNode is NumericNode)
{
NumericNode numericNode = (NumericNode)inNode;
return(numericNode.Number.ToString().Trim());
}
return(null);
}
public static Node Parse(string inExpression, List <Operator> operators)
{
//inExpression = RemoveEnclosingBrackets(inExpression);
double number;
if (double.TryParse(inExpression, out number))
{
NumericNode numericNode = new NumericNode();
numericNode.Number = number;
return(numericNode);
}
List <int> bracketDepths = BracketDepths(inExpression);
bool foundOperator = false;
foreach (Operator o in operators)
{
List <string> operands = null;
if (o.OperatorType == OperatorType.Delimiting)
{
operands = ParseDelimiting(inExpression, o, bracketDepths, out foundOperator);
}
else if (o.OperatorType == OperatorType.Unary)
{
operands = ParseUnary(inExpression, o, out foundOperator);
}
else if (o.OperatorType == OperatorType.Enclosing)
{
operands = ParseEnclosing(inExpression, o, out foundOperator);
}
if (foundOperator)
{
OperatorNode operatorNode = new OperatorNode();
foreach (string operand in operands)
{
Node childNode = Parse(operand, operators);
childNode.Parent = operatorNode;
operatorNode.Children.Add(childNode);
}
operatorNode.Operator = o;
return(operatorNode);
}
}
Node newNode = ParseNewEnclosing(inExpression, out foundOperator, operators);
if (foundOperator)
{
return(newNode);
}
VariableNode variableNode = new VariableNode();
variableNode.Variable = inExpression;
if (inExpression.First() == 'C')
{
variableNode.VariableNodeType = VariableNodeType.RequireNumber;
}
else if (inExpression.First() == 'V')
{
variableNode.VariableNodeType = VariableNodeType.RequireVariable;
}
else
{
variableNode.VariableNodeType = VariableNodeType.NoRequirement;
}
return(variableNode);
}