public void Recyrse(string input, out Node D)
{
D = null;
if (input.Length == 2)
{
if (TestForSymbol(input.Substring(0, 1)) == 0)
{
D = new NodeConst(Int32.Parse(input.Substring(1, 1)));
}
else
{
D = new NodeConst(Int32.Parse(input.Substring(0, 1)));
}
//Console.Write(N + " ");
//Console.WriteLine(D.Value);
}
else if (TestForSymbol(input) == 3)
{
D = new NodeConst(Int32.Parse(input));
//Console.Write(N + " ");
//Console.WriteLine(input);
}
else if ((TestForSymbol(input.Substring(0, 1)) == 0) && (input.Length >= 5))
{
string s1 = "";
string s2 = input;
s2 = s2.Substring(1);
s2 = s2.Substring(0, s2.Length - 1);
string ch = "";
Node D1, D2;
s1 = StringSplit(ref s2, out ch);
Recyrse(s1, out D1);
Recyrse(s2, out D2);
Operation t = Operation.NONE;;
if (ch == "+")
{
t = Operation.PLUS;
}
if (ch == "-")
{
t = Operation.MINUS;
}
if (ch == "*")
{
t = Operation.MULTIPLY;
}
//ch to operation
D = new NodeOperation(t, D1, D2);
//Console.Write(N + " ");
//Console.WriteLine(ch);
//Console.WriteLine(ch);
}
}
public void Expression(ref string s, out Node D) // выражение
{
D = null;
s = s.Trim();
if (s.Length != 0)
{
if (Test(s[0], '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ',', '+', '-'))
{
D = new NodeConst(Int32.Parse(Pop(ref s, 1)));
}
else if (Peek(ref s) == '(')
{
s = s.Substring(1);
s = s.Substring(0, s.Length - 1);
string s1 = SignSplit(ref s);
string sign = Pop(ref s, 1);
Node DL, DR = null;
Expression(ref s1, out DL);
Expression(ref s, out DR);
Operation op = Operation.NONE;
if (sign == "+")
{
op = Operation.PLUS;
}
else if (sign == "-")
{
op = Operation.MINUS;
}
else if (sign == "/")
{
op = Operation.DIVIDE;
}
else if (sign == "*")
{
op = Operation.MULTIPLY;
}
D = new NodeOperation(op, DL, DR);
}
}
else
{
D = null; error = 4; // ожидается выражение
}
} // Expression
