protected override void AnalysExpression(LexemList lexems)
{
var first = lexems == null ? null : lexems.FirstOrDefault() as LexemOperator;
if (first != null && first.OperatorType == LexemOperator.OperationType.Arithmetic && first.Text == "-")
lexems.Insert(0, 0);
base.AnalysExpression(lexems);
}
protected override void AnalysExpression(LexemList lexems)
{
if (lexems != null && lexems.Count > 0 && lexems[0].ToString() == "-")
lexems.Insert(0, 0);
base.AnalysExpression(lexems);
}