bool writePrecedingCommentsAndNewlines()

in lib/src/source_visitor.dart [3803:3885]
48 lines of code
19 McCabe index (conditional complexity)

  bool writePrecedingCommentsAndNewlines(Token token) {
    Token? comment = token.precedingComments;

    // For performance, avoid calculating newlines between tokens unless
    // actually needed.
    if (comment == null) {
      if (builder.needsToPreserveNewlines) {
        builder.preserveNewlines(_startLine(token) - _endLine(token.previous!));
      }

      return false;
    }

    // If the token's comments are being moved by a fix, do not write them here.
    if (_suppressPrecedingCommentsAndNewLines.contains(token)) return false;

    var previousLine = _endLine(token.previous!);
    var tokenLine = _startLine(token);

    // Edge case: The analyzer includes the "\n" in the script tag's lexeme,
    // which confuses some of these calculations. We don't want to allow a
    // blank line between the script tag and a following comment anyway, so
    // just override the script tag's line.
    if (token.previous!.type == TokenType.SCRIPT_TAG) previousLine = tokenLine;

    var comments = <SourceComment>[];
    while (comment != null) {
      var commentLine = _startLine(comment);

      // Don't preserve newlines at the top of the file.
      if (comment == token.precedingComments &&
          token.previous!.type == TokenType.EOF) {
        previousLine = commentLine;
      }

      var text = comment.lexeme.trim();
      var linesBefore = commentLine - previousLine;
      var flushLeft = _startColumn(comment) == 1;

      if (text.startsWith('///') && !text.startsWith('////')) {
        // Line doc comments are always indented even if they were flush left.
        flushLeft = false;

        // Always add a blank line (if possible) before a doc comment block.
        if (comment == token.precedingComments) linesBefore = 2;
      }

      var type = CommentType.block;
      if (text.startsWith('///') && !text.startsWith('////') ||
          text.startsWith('/**')) {
        type = CommentType.doc;
      } else if (comment.type == TokenType.SINGLE_LINE_COMMENT) {
        type = CommentType.line;
      } else if (commentLine == previousLine || commentLine == tokenLine) {
        type = CommentType.inlineBlock;
      }

      var sourceComment =
          SourceComment(text, type, linesBefore, flushLeft: flushLeft);

      // If this comment contains either of the selection endpoints, mark them
      // in the comment.
      var start = _getSelectionStartWithin(comment.offset, comment.length);
      if (start != null) sourceComment.startSelection(start);

      var end = _getSelectionEndWithin(comment.offset, comment.length);
      if (end != null) sourceComment.endSelection(end);

      comments.add(sourceComment);

      previousLine = _endLine(comment);
      comment = comment.next;
    }

    builder.writeComments(comments, tokenLine - previousLine, token.lexeme);

    // TODO(rnystrom): This is wrong. Consider:
    //
    // [/* inline comment */
    //     // line comment
    //     element];
    return comments.first.linesBefore > 0;
  }