/*
* Pushes the current operator token to the stack and pops Evaluatables from the stack
*/
private void FoundOperator(string token, List <string> result)
{
var op = Evaluatables[token];
if (Hold.Count != 0)
{
while (Hold.Count != 0)
{
var topOfStack = Hold.Peek();
if (!Evaluatables.OperatorExists(topOfStack))
{
break;
}
var operatorTop = Evaluatables[topOfStack];
if ((OperatorHelper.CheckAssociativity(op, Associativity.L) && op.Precedence <= operatorTop.Precedence) ||
OperatorHelper.CheckAssociativity(op, Associativity.R) && op.Precedence < operatorTop.Precedence)
{
result.Add(Hold.Pop());
}
else
{
break;
}
}
}
Hold.Push(token);
}
private void FoundSpecialChar(char partialToken, List <string> result)
{
switch (partialToken)
{
case '(':
Hold.Push(partialToken.ToString());
return;
case ')':
/*
* Pop Evaluatables from the stack until a matching parenthesis is found
*/
var foundLeftParenthesis = false;
do
{
var topOfStack = Hold.Pop();
if (topOfStack == "(")
{
foundLeftParenthesis = true;
break;
}
result.Add(topOfStack);
} while (Hold.Count != 0);
if (!foundLeftParenthesis)
{
throw new MissMatchedParenthesisException();
}
break;
case ',':
var topOfstack = Hold.Peek();
while (topOfstack != "(")
{
if (Hold.Count != 0)
{
result.Add(Hold.Pop());
topOfstack = Hold.Peek();
}
else
{
throw new MissMatchedParenthesisException();
}
}
break;
default:
throw new UnexpectedOperatorException($"Unexpected Operator {partialToken}");
}
}