class SyntaxTree::Formatter

def format(node, stackable: true)
  stack << node if stackable
  doc = nil
  # If there are comments, then we're going to format them around the node
  # so that they get printed properly.
  if node.comments.any?
    trailing = []
    last_leading = nil
    # First, we're going to print all of the comments that were found before
    # the node. We'll also gather up any trailing comments that we find.
    node.comments.each do |comment|
      if comment.leading?
        comment.format(self)
        breakable(force: true)
        last_leading = comment
      else
        trailing << comment
      end
    end
    # If the node has a stree-ignore comment right before it, then we're
    # going to just print out the node as it was seen in the source.
    doc =
      if last_leading&.ignore?
        range = source[node.start_char...node.end_char]
        first = true
        range.each_line(chomp: true) do |line|
          if first
            first = false
          else
            breakable_return
          end
          text(line)
        end
        breakable_return if range.end_with?("\n")
      else
        node.format(self)
      end
    # Print all comments that were found after the node.
    trailing.each do |comment|
      line_suffix(priority: COMMENT_PRIORITY) do
        comment.inline? ? text(" ") : breakable
        comment.format(self)
        break_parent
      end
    end
  else
    doc = node.format(self)
  end
  stack.pop if stackable
  doc
end