private static void RemoveDisallowedRepeats(LexerCursor inputCursor, List <LexCapture> elements)
{
LexCapture lastOperator = null;
foreach (var element in inputCursor.GetVitalCapture())
{
if (element.Type.Name == null)
{
continue;
}
element.Value = (element.Value ?? "").Trim();
if (string.IsNullOrWhiteSpace(element.Value))
{
element.Value = " ";
}
if (IsDisallowedRepeats(elements, lastOperator, element))
{
continue;
}
elements.Add(element);
switch (element.Type.Name)
{
case LuceneQueryParser.KeywordParenthesesClose:
case LuceneQueryParser.KeywordParenthesesOpen:
case LuceneQueryParser.KeywordQuoteContent:
case LuceneQueryParser.KeywordOperand:
lastOperator = null;
break;
case LuceneQueryParser.KeywordOperator:
lastOperator = element;
break;
// ReSharper disable once RedundantEmptySwitchSection
default:
break;
}
}
}
private static bool IsDisallowedRepeats(List <LexCapture> elements,
LexCapture lastOperator,
LexCapture element)
{
if (lastOperator?.Value == element.Value && lastOperator?.Type?.Name == element.Type.Name)
{
return(true);
}
if (elements.LastOrDefault()?.Value != element.Value)
{
return(false);
}
if (element.Value?.Length != 1)
{
return(true);
}
return(!Repeatables.Contains(element.Value[0]));
}