/// <summary>
/// Determines whether [is compute operator] [the specified input].
/// </summary>
/// <param name="input">The input.</param>
/// <param name="computeOperator">The compute operator.</param>
/// <returns><c>true</c> if [is compute operator] [the specified input]; otherwise, <c>false</c>.</returns>
private bool IsComputeOperator(string input, out ComputeOperator computeOperator)
{
var result = BooleanSearchCore.ToComputeOperator(input);
if (result.HasValue)
{
computeOperator = result.Value;
return(true);
}
computeOperator = default(ComputeOperator);
return(false);
}
/// <summary>
/// Expects the compute operator.
/// </summary>
/// <param name="input">The input.</param>
/// <param name="position">The position.</param>
/// <returns>System.Nullable<ComputeOperator>.</returns>
/// <exception cref="Beyova.Diagnostic.InvalidExpressiontException"></exception>
private ComputeOperator?ExpectComputeOperator(string input, ref int position)
{
string operatorString = null;
TrimStartSpaces(input, ref position);
var startPosition = position;
bool isSymbol = position < input.Length && computeOperatorSymbolChars.HasItem(input[position]);
while (position < input.Length)
{
if (isSymbol)
{
if (computeOperatorSymbolChars.HasItem(input[position]))
{
position++;
}
else
{
break;
}
}
else
{
if (!relationshipOperatorInterruptChars.HasItem(input[position]))
{
position++;
}
else
{
break;
}
}
}
operatorString = input.Substring(startPosition, position - startPosition);
return(BooleanSearchCore.ToComputeOperator(operatorString));
}