public static ExprVarValue Parse(string s)
{
ExprVarValue res;
int i = 0;
Buttons ButtonType;
string button;
button = ButtonFunctions.ParseNextButton(s, ref i, out ButtonType);
if (ButtonType != Buttons.Letter)
{
throw new Exception();
}
res.Name = button;
button = ButtonFunctions.ParseNextButton(s, ref i, out ButtonType);
if (button != "=")
{
throw new Exception();
}
res.Value = ExpressionTree.Build(s, ref i);
return(res);
}
public static ExpressionTree Build(string s, ref int startPos)
{
ExpressionTree tree = new ExpressionTree();
ExpressionTree tRoot = tree;
int i = startPos;
while (i < s.Length)
{
Buttons ButtonType;
string button = ButtonFunctions.ParseNextButton(s, ref i, out ButtonType);
Console.WriteLine(button);
if (ButtonType == Buttons.Number)
{
tree.AddValue(double.Parse(button));
}
else if (ButtonType == Buttons.Letter && button.Length == 1)
{
tree.AddValue(button);
}
else
{
ExprOperations newOperation = ExprOperations.NoneOperations;
if (ButtonType == Buttons.Letter && button.Length > 1)
{
newOperation = new ExprOperations(button);
}
else if (ButtonType == Buttons.Operator)
{
newOperation = new ExprOperations(button[0]);
}
if (ButtonType == Buttons.Operator || ButtonType == Buttons.Letter)
{
if (tree.Operation == ExprOperations.NoneOperations)
{
tree.Operation = newOperation;
}
else if (newOperation.Priority > tree.Operation.Priority)
{
tree.Right = new ExpressionTree(newOperation, tree.Right, null, tree);
}
tree = (ExpressionTree)tree.Right;
}
else
{
tree.Left = tree.CopyPartial();
tree.Operation = newOperation;
tree.Right = null;
}
if (ButtonType == Buttons.Bracket)
{
if (button[0] == '(')
{
if (tree.Left == null)
{
tree.Left = new ExpressionTree(Parent: tree);
tree = (ExpressionTree)tree.Left;
}
else
{
tree.Right = new ExpressionTree(Parent: tree);
tree = (ExpressionTree)tree.Right;
}
}
else if (button[0] == ')')
{
tree = tree.Parent;
}
}
}
}
return(tRoot);
}