private static List<TextRange> addPreviousComma(PsiElement e, int cursorOffset) {
    PsiElement prevSibling = e.getPrevSibling();
    TextRange textRange = e.getTextRange();
    TextRange offsetRange = null;
    if (prevSibling != null) {
      if (prevSibling instanceof PsiWhiteSpace) {
        PsiElement prevCommaSibling = prevSibling.getPrevSibling();
        if (prevCommaSibling != null) {
          ASTNode node = prevCommaSibling.getNode();
          if (node != null) {
            IElementType commaType = node.getElementType();
            if (commaType == PyTokenTypes.COMMA) {
              offsetRange = new TextRange(textRange.getStartOffset() - 2, textRange.getEndOffset());
              if (offsetRange.contains(cursorOffset) && offsetRange.getLength() > 1) {
                return Collections.singletonList(offsetRange);
              }
            }
          }
        }
      }
      else {
        ASTNode node = prevSibling.getNode();
        if (node != null) {
          IElementType commaType = node.getElementType();
          if (commaType == PyTokenTypes.COMMA) {
            offsetRange = new TextRange(textRange.getStartOffset() - 1, textRange.getEndOffset());
          }
        }
      }
      if (offsetRange != null) {
        if (offsetRange.contains(cursorOffset) && offsetRange.getLength() > 1) {
          return Collections.singletonList(offsetRange);
        }
      }
    }
    return Collections.emptyList();
  }
private static List<TextRange> addPreviousComma(PsiElement e, int cursorOffset)