private static void removeTrailingSpaces(final Document document, final int startOffset) {
      int endOffset = startOffset;

      final CharSequence charsSequence = document.getCharsSequence();

      for (int i = startOffset; i < charsSequence.length(); i++) {
        final char c = charsSequence.charAt(i);
        endOffset = i;
        if (c == '\n') {
          break;
        }
        if (c != ' ' && c != '\t') {
          return;
        }
      }

      document.deleteString(startOffset, endOffset);
    }
    private void generateJavadoc(CodeDocumentationAwareCommenter commenter)
        throws IncorrectOperationException {
      CodeInsightSettings settings = CodeInsightSettings.getInstance();
      StringBuilder buffer = new StringBuilder();
      final String docCommentLinePrefix = commenter.getDocumentationCommentLinePrefix();
      if (docCommentLinePrefix == null) {
        return;
      }

      // There are at least two approaches for completing javadoc in case there is a text between
      // current caret position and line end:
      //     1. Move that tail text below the javadoc. Use-case:
      //         Before:
      //             /**<caret>public void foo() {}
      //         After:
      //             /**
      //              */
      //             public void foo() {}
      //     2. Move the tail text inside the javadoc. Use-case:
      //          Before:
      //             /**This is <caret>javadoc description
      //          After:
      //             /** This is
      //              * javadoc description
      //              */
      // The later is most relevant when we have 'auto wrap when typing reaches right margin' option
      // set, i.e. user starts javadoc
      // and types until right margin is reached. We want the wrapped text tail to be located inside
      // javadoc and continue typing
      // inside it. So, we have a control flow branch below that does the trick.
      buffer.append(docCommentLinePrefix);
      if (DataManager.getInstance()
              .loadFromDataContext(
                  myDataContext, AutoHardWrapHandler.AUTO_WRAP_LINE_IN_PROGRESS_KEY)
          == Boolean.TRUE) {
        myDocument.insertString(myOffset, buffer);

        // We create new buffer here because the one referenced by current 'buffer' variable value
        // may be already referenced at another
        // place (e.g. 'undo' processing stuff).
        buffer =
            new StringBuilder(LINE_SEPARATOR).append(commenter.getDocumentationCommentSuffix());
        int line = myDocument.getLineNumber(myOffset);
        myOffset = myDocument.getLineEndOffset(line);
      } else {
        buffer.append(LINE_SEPARATOR);
        buffer.append(commenter.getDocumentationCommentSuffix());
      }

      PsiComment comment = createComment(buffer, settings);
      if (comment == null) {
        return;
      }

      myOffset = comment.getTextRange().getStartOffset();
      CharSequence text = myDocument.getCharsSequence();
      myOffset = CharArrayUtil.shiftForwardUntil(text, myOffset, LINE_SEPARATOR);
      myOffset = CharArrayUtil.shiftForward(text, myOffset, LINE_SEPARATOR);
      myOffset = CharArrayUtil.shiftForwardUntil(text, myOffset, docCommentLinePrefix) + 1;
      removeTrailingSpaces(myDocument, myOffset);

      if (!CodeStyleSettingsManager.getSettings(getProject()).JD_LEADING_ASTERISKS_ARE_ENABLED) {
        LOG.assertTrue(
            CharArrayUtil.regionMatches(
                myDocument.getCharsSequence(),
                myOffset - docCommentLinePrefix.length(),
                docCommentLinePrefix));
        myDocument.deleteString(myOffset - docCommentLinePrefix.length(), myOffset);
        myOffset--;
      } else {
        myDocument.insertString(myOffset, " ");
        myOffset++;
      }

      PsiDocumentManager.getInstance(getProject()).commitAllDocuments();
    }
  public void uncommentRange(
      TextRange range, String commentPrefix, String commentSuffix, Commenter commenter) {
    if (commenter instanceof SelfManagingCommenter) {
      final SelfManagingCommenter selfManagingCommenter = (SelfManagingCommenter) commenter;
      selfManagingCommenter.uncommentBlockComment(
          range.getStartOffset(), range.getEndOffset(), myDocument, mySelfManagedCommenterData);
      return;
    }

    String text =
        myDocument
            .getCharsSequence()
            .subSequence(range.getStartOffset(), range.getEndOffset())
            .toString();
    int startOffset = range.getStartOffset();
    // boolean endsProperly = CharArrayUtil.regionMatches(chars, range.getEndOffset() -
    // commentSuffix.length(), commentSuffix);
    List<Couple<TextRange>> ranges = new ArrayList<>();

    if (commenter instanceof CustomUncommenter) {
      /*
       In case of custom uncommenter, we need to ask it for list of [commentOpen-start,commentOpen-end], [commentClose-start,commentClose-end]
       and shift if according to current offset
      */
      CustomUncommenter customUncommenter = (CustomUncommenter) commenter;
      for (Couple<TextRange> coupleFromCommenter :
          customUncommenter.getCommentRangesToDelete(text)) {
        TextRange openComment = coupleFromCommenter.first.shiftRight(startOffset);
        TextRange closeComment = coupleFromCommenter.second.shiftRight(startOffset);
        ranges.add(Couple.of(openComment, closeComment));
      }
    } else {
      // If commenter is not custom, we need to get this list by our selves
      int position = 0;
      while (true) {
        int start = getNearest(text, commentPrefix, position);
        if (start == text.length()) {
          break;
        }
        position = start;
        int end =
            getNearest(text, commentSuffix, position + commentPrefix.length())
                + commentSuffix.length();
        position = end;
        Couple<TextRange> pair =
            findCommentBlock(
                new TextRange(start + startOffset, end + startOffset),
                commentPrefix,
                commentSuffix);
        ranges.add(pair);
      }
    }

    RangeMarker marker = myDocument.createRangeMarker(range);
    try {
      for (int i = ranges.size() - 1; i >= 0; i--) {
        Couple<TextRange> toDelete = ranges.get(i);
        myDocument.deleteString(toDelete.first.getStartOffset(), toDelete.first.getEndOffset());
        int shift = toDelete.first.getEndOffset() - toDelete.first.getStartOffset();
        myDocument.deleteString(
            toDelete.second.getStartOffset() - shift, toDelete.second.getEndOffset() - shift);
        if (commenter.getCommentedBlockCommentPrefix() != null) {
          commentNestedComments(
              myDocument,
              new TextRange(
                  toDelete.first.getEndOffset() - shift, toDelete.second.getStartOffset() - shift),
              commenter);
        }
      }

      processDocument(myDocument, marker, commenter, false);
    } finally {
      marker.dispose();
    }
  }