public BuildInfixNode(string op, BuildInfixNode operand)
{
Value = null;
Children = new BuildInfixNode[] { new BuildInfixNode(op), operand };
}
public BuildInfixNode(BuildInfixNode open, BuildInfixNode left, string op, BuildInfixNode right, BuildInfixNode close)
{
Value = null;
Children = new BuildInfixNode[] { open, left, new BuildInfixNode(" " + op + " "), right, close };
}
private string BuildInfix(bool tokenize)
{
int i = 0;
var s = new Stack <BuildInfixNode>();
var open = new BuildInfixNode("(");
var close = new BuildInfixNode(")");
while (i < TokenizedPostfix.Length)
{
char c = TokenizedPostfix[i++];
if (c == '{')
{
if (TokenizedPostfix[i] == 'A')
{
int j = i + 3; // parsing an argument, j points at the 1st digit of the argument's index
int k = j + 1;
while (TokenizedPostfix[k] != '}')
{
++k;
}
if (tokenize)
{
s.Push(new BuildInfixNode(TokenizedPostfix.Substring(i - 1, k - i + 2)));
}
else
{
s.Push(new BuildInfixNode(_argBook[int.Parse(TokenizedPostfix.Substring(j, k - j))]));
}
i = k + 1;
}
else
{
int j = i + 1; // parsing a const number, j points at the number's 1st digit
while (TokenizedPostfix[j] != '}')
{
++j;
}
if (tokenize)
{
s.Push(new BuildInfixNode(TokenizedPostfix.Substring(i - 1, j - i + 2)));
}
else
{
s.Push(new BuildInfixNode(TokenizedPostfix.Substring(i, j - i)));
}
i = j + 1;
}
}
else if (c == 'N')
{
s.Push(new BuildInfixNode("-", s.Pop()));
}
else if (c == 'P')
{
s.Push(new BuildInfixNode("+", s.Pop()));
}
else
{
var x1 = s.Pop(); // merges a binary operator with two of its operands
var x2 = s.Pop();
s.Push(new BuildInfixNode(open, x2, c.ToString(), x1, close));
}
}
return(s.Pop().ToString());
}
