public void PFormula(ref string s, out Node D) // операции отношения
{
s = s.Trim();
if (s.Length != 0)
{
Expression(ref s, out D);
s = s.Trim();
Operation chRelation = SetChRelation(s);
if (chRelation != Operation.NONE)
{
switch (chRelation)
{
case Operation.LESS:
case Operation.MORE:
Pop(ref s, 1); break;
case Operation.EQUALLY:
case Operation.NOTEQUALLY:
case Operation.LESSEQUALLY:
case Operation.MOREEQUALLY:
Pop(ref s, 2);
break;
}
Node D2;
Expression(ref s, out D2);
Node D1 = D;
D = new NodeOperation(chRelation, D1, D2);
}
}
else
{
D = null; throw new NodeException(5, "ошибка в операциях отношения");
}
}
public void Expression(ref string s, out Node D) // + - |
{
s = s.Trim();
if (s.Length != 0)
{
string sign = "+";
if ((Peek(ref s) == '+') | (Peek(ref s) == '-'))
{
sign = Pop(ref s, 1);
}
Term(ref s, out D);
if (sign == "-")
{
Node D1 = D;
Node D2 = D1;
D = new NodeFunc(7, D1, D2);
}
s = s.Trim();
while ((s.Length > 0) && ((Peek(ref s) == '+') | (Peek(ref s) == '-') | (Peek(ref s) == '|')))
{
sign = Pop(ref s, 1);
if (s.Length != 0)
{
if ((Peek(ref s) == '+') | (Peek(ref s) == '-') | (Peek(ref s) == '|'))
{
throw new NodeException(7, "лишний знак");
}
}
else
{
throw new NodeException(7, "после знака ничего не оказалось");
}
Node D2;
Term(ref s, out D2);
Node D1 = D;
Operation t = Operation.PLUS;
switch (sign[0])
{
case '+': t = Operation.PLUS; break;
case '-': t = Operation.MINUS; break;
case '|': t = Operation.OR; break;
}
D = new NodeOperation(t, D1, D2);
}
}
else
{
D = null; throw new NodeException(6, "нехватка данных");
}
}
void Term(ref string s, out Node D) // * / & ^
{
s = s.Trim();
if (s.Length != 0)
{
Factor(ref s, out D);
while ((s.Length != 0) && ((Peek(ref s) == '*') | (Peek(ref s) == '/') | (Peek(ref s) == '&') | (Peek(ref s) == '^')))
{
string znak = Pop(ref s, 1);
if (s.Length == 0)
{
throw new NodeException(8, "после знака ничего не оказалось");
}
Node D2;
Factor(ref s, out D2);
Node D1 = D;
Operation t = Operation.MULTIPLY;
switch (znak)
{
case "*": t = Operation.MULTIPLY; break;
case "/": t = Operation.DIVIDE; break;
case "&": t = Operation.AND; break;
case "^": t = Operation.POWER; break;
}
D = new NodeOperation(t, D1, D2);
}
}
else
{
D = null; throw new NodeException(8, "нехватка данных");
}
}
