public EvalNodeBuilder(List <string> postfix)
{
var tokens = new Queue <string>(postfix);
while (tokens.Count > 0)
{
var token = tokens.Dequeue();
if (OperatorLibrary.IsOperator(token))
{
PushOperator(token);
}
else if (IsFunction(token))
{
var arity = int.Parse(tokens.Dequeue());
PushFunction(token, arity);
}
else if (IsBool(token))
{
PushBool(token);
}
else if (IsValue(token))
{
PushValue(token);
}
else if (IsString(token))
{
PushString(token);
}
else
{
PushCellReferenceNode(token);
}
}
Root = treeNodes.Pop();
}
private bool CurrentIsOperator() => OperatorLibrary.IsOperator(current);
private bool CurrentIsUnary() => CurrentIsUnaryToken() && (CurrentIsStartOfExpression() || StackTopIsSemicolon() || OperatorLibrary.IsOperator(previous));
