private void processOperator(Token t, TokenStack valueStack, ref bool error)
{
Token A = null, B = null;
if (valueStack.isEmpty())
{
((ViewModel)DataContext).Result = ERROR;
error = true;
}
else
{
B = valueStack.top();
valueStack.pop();
}
if (valueStack.isEmpty())
{
((ViewModel)DataContext).Result = ERROR;
error = true;
}
else
{
A = valueStack.top();
valueStack.pop();
}
Token R = null;
if (A != null && B != null)
{
R = t.operate(A.getValue(), B.getValue());
if (R.getType() == -1)
{
error = true;
}
else
{
valueStack.push(R);
}
}
else
{
error = true;
}
}
void Result()
{
String input = strFormatter(((ViewModel)DataContext).Result);
String stockOperation = ((ViewModel)DataContext).Result.Replace(" ", "");
bool error = false;
if (stockOperation == "")
{
error = true;
((ViewModel)DataContext).Result = ERROR;
}
TokenStack operatorStack = new TokenStack();
TokenStack valueStack = new TokenStack();
// The tokens that make up the input
String[] parts = input.Split(' ');
Token[] tokens = new Token[parts.Length];
for (int n = 0; n < parts.Length; n++)
{
tokens[n] = new Token(parts[n]);
}
// Main loop - process all input tokens
for (int n = 0; n < tokens.Length; n++)
{
Token nextToken = tokens[n];
if (nextToken.getType() == Token.NUMBER)
{
valueStack.push(nextToken);
}
else if (nextToken.getType() == Token.OPERATOR)
{
if (operatorStack.isEmpty() || nextToken.getPrecedence() > operatorStack.top().getPrecedence())
{
operatorStack.push(nextToken);
}
else
{
while (!operatorStack.isEmpty() && nextToken.getPrecedence() <= operatorStack.top().getPrecedence())
{
Token toProcess = operatorStack.top();
operatorStack.pop();
processOperator(toProcess, valueStack, ref error);
}
operatorStack.push(nextToken);
}
}
else if (nextToken.getType() == Token.LEFT_PARENTHESIS)
{
operatorStack.push(nextToken);
}
else if (nextToken.getType() == Token.RIGHT_PARENTHESIS)
{
while (!operatorStack.isEmpty() && operatorStack.top().getType() == Token.OPERATOR)
{
Token toProcess = operatorStack.top();
operatorStack.pop();
processOperator(toProcess, valueStack, ref error);
}
if (!operatorStack.isEmpty() && operatorStack.top().getType() == Token.LEFT_PARENTHESIS)
{
operatorStack.pop();
}
else
{
error = true;
((ViewModel)DataContext).Result = ERROR;
}
}
}
// Empty out the operator stack at the end of the input
while (!operatorStack.isEmpty() && operatorStack.top().getType() == Token.OPERATOR)
{
Token toProcess = operatorStack.top();
operatorStack.pop();
processOperator(toProcess, valueStack, ref error);
}
// Print the result if no error has been seen.
if (error == false)
{
Token result = null;
if (valueStack.getTokens().Count != 0)
{
result = valueStack.top();
valueStack.pop();
}
if (!operatorStack.isEmpty() || !valueStack.isEmpty() || result == null)
{
((ViewModel)DataContext).Result = ERROR;
}
else
{
((ViewModel)DataContext).Result = Convert.ToString(result.getValue());
}
}
else
{
((ViewModel)DataContext).Result = ERROR;
}
if (((ViewModel)DataContext).Result != ERROR)
{
((ViewModel)DataContext).AddItem(stockOperation);
((ViewModel)DataContext).Calcul = stockOperation;
((ViewModel)DataContext).ResultatCalcul = ((ViewModel)DataContext).Result;
}
}
