/// <summary>
/// Read function name
/// </summary>
public bool TryProceedFunction(List <BaseFormulaNode> nodes, ReadOnlySpan <char> formula, ref int index)
{
// Read unary minus
var localIndex = UnaryMinusReader.ReadUnaryMinus(nodes, formula, index, out var isNegativeLocal);
// Read function
var functionNameBuilder = new NameBuilder();
for (int fInd = 0; fInd < _functions.Count; fInd++)
{
var function = _functions[fInd];
// Set function name
functionNameBuilder.Reset(function.Name);
for (int i = localIndex; i < formula.Length; i++)
{
var ch = formula[i];
if (functionNameBuilder.TryRemember(ch))
{
if (functionNameBuilder.IsFinished && IsBracketNext(formula, i + 1))
{
var functionNode = new FunctionNode(function, isNegativeLocal);
nodes.Add(functionNode);
index = i;
return(true);
}
}
else
{
break;
}
}
}
return(false);
}
/// <summary>
/// Read operator
/// </summary>
public static bool TryProceedOperator(List <BaseFormulaNode> nodes, ReadOnlySpan <char> formula, ref int index)
{
var operatorNameBuilder = new NameBuilder();
for (int operInd = 0; operInd < _operators.Length; operInd++)
{
var operatorName = _operators[operInd];
// Set operator name
operatorNameBuilder.Reset(operatorName);
for (int i = index; i < formula.Length; i++)
{
var ch = formula[i];
if (operatorNameBuilder.TryRemember(ch))
{
if (operatorNameBuilder.IsFinished)
{
var operatorKey = GetOperatorKey(operatorName);
var operatorNode = new OperatorNode(operatorKey);
nodes.Add(operatorNode);
index = i;
return(true);
}
}
else
{
break;
}
}
}
return(false);
}
