/// <summary>
/// Check to see if we have a equals or not equals expression where an empty string is being
/// compared.
/// </summary>
private static void AnalyzeBinaryExpression(IBinaryOperation binaryOperation,
INamedTypeSymbol?linqExpressionTreeType, Action <Diagnostic> reportDiagnostic)
{
if (binaryOperation.OperatorKind is not BinaryOperatorKind.Equals and
not BinaryOperatorKind.NotEquals)
{
return;
}
if (binaryOperation.LeftOperand.Type?.SpecialType != SpecialType.System_String ||
binaryOperation.RightOperand.Type?.SpecialType != SpecialType.System_String)
{
return;
}
if (!IsEmptyString(binaryOperation.LeftOperand) &&
!IsEmptyString(binaryOperation.RightOperand))
{
return;
}
// Check if we are in a Expression<Func<T...>> context, in which case it is possible
// that the underlying call doesn't have the helper so we want to bail-out.
if (!binaryOperation.IsWithinExpressionTree(linqExpressionTreeType))
{
reportDiagnostic(binaryOperation.Syntax.CreateDiagnostic(s_rule));
}
}
