How to use the yapf.yapflib.pytree_utils.LastLeafNode function in yapf

# A comment was inserted before the value, which is a pytree.Leaf.
    # Encompass the dictionary's value into an ATOM node.
    last = first.next_sibling
    last_clone = last.clone()
    new_node = pytree.Node(syms.atom, [first.clone(), last_clone])
    for orig_leaf, clone_leaf in zip(last.leaves(), last_clone.leaves()):
      pytree_utils.CopyYapfAnnotations(orig_leaf, clone_leaf)
      if hasattr(orig_leaf, 'is_pseudo'):
        clone_leaf.is_pseudo = orig_leaf.is_pseudo

    node.replace(new_node)
    node = new_node
    last.remove()

    first = pytree_utils.FirstLeafNode(node)
    last = pytree_utils.LastLeafNode(node)

  lparen = pytree.Leaf(
      token.LPAR, u'(', context=('', (first.get_lineno(), first.column - 1)))
  last_lineno = last.get_lineno()
  if last.type == token.STRING and '\n' in last.value:
    last_lineno += last.value.count('\n')

  if last.type == token.STRING and '\n' in last.value:
    last_column = len(last.value.split('\n')[-1]) + 1
  else:
    last_column = last.column + len(last.value) + 1
  rparen = pytree.Leaf(
      token.RPAR, u')', context=('', (last_lineno, last_column)))

  lparen.is_pseudo = True
  rparen.is_pseudo = True

# We don't want to split before the last ')' of a function call. This also
    # takes care of the special case of:
    #   atom tr1 tr2 ... trn
    # where the 'tr#' are trailers that may end in a ')'.
    for trailer in node.children[1:]:
      if pytree_utils.NodeName(trailer) != 'trailer':
        break
      if trailer.children[0].value in '([':
        if len(trailer.children) > 2:
          subtypes = pytree_utils.GetNodeAnnotation(
              trailer.children[0], pytree_utils.Annotation.SUBTYPE)
          if subtypes and format_token.Subtype.SUBSCRIPT_BRACKET in subtypes:
            _SetStronglyConnected(
                pytree_utils.FirstLeafNode(trailer.children[1]))

          last_child_node = pytree_utils.LastLeafNode(trailer)
          if last_child_node.value.strip().startswith('#'):
            last_child_node = last_child_node.prev_sibling
          if not (style.Get('INDENT_CLOSING_BRACKETS') or style.Get('DEDENT_CLOSING_BRACKETS')):
            last = pytree_utils.LastLeafNode(last_child_node.prev_sibling)
            if last.value != ',':
              if last_child_node.value == ']':
                _SetUnbreakable(last_child_node)
              else:
                _SetSplitPenalty(last_child_node, VERY_STRONGLY_CONNECTED)
        else:
          # If the trailer's children are '()', then make it a strongly
          # connected region.  It's sometimes necessary, though undesirable, to
          # split the two.
          _SetStronglyConnected(trailer.children[-1])

def _InsertPseudoParentheses(node):
  """Insert pseudo parentheses so that dicts can be formatted correctly."""
  comment_node = None
  if isinstance(node, pytree.Node):
    if node.children[-1].type == token.COMMENT:
      comment_node = node.children[-1].clone()
      node.children[-1].remove()

  first = pytree_utils.FirstLeafNode(node)
  last = pytree_utils.LastLeafNode(node)

  if first == last and first.type == token.COMMENT:
    # A comment was inserted before the value, which is a pytree.Leaf.
    # Encompass the dictionary's value into an ATOM node.
    last = first.next_sibling
    last_clone = last.clone()
    new_node = pytree.Node(syms.atom, [first.clone(), last_clone])
    for orig_leaf, clone_leaf in zip(last.leaves(), last_clone.leaves()):
      pytree_utils.CopyYapfAnnotations(orig_leaf, clone_leaf)
      if hasattr(orig_leaf, 'is_pseudo'):
        clone_leaf.is_pseudo = orig_leaf.is_pseudo

    node.replace(new_node)
    node = new_node
    last.remove()

def _StronglyConnectedCompOp(op):
  if (len(op.children[1].children) == 2 and
      pytree_utils.NodeName(op.children[1]) == 'comp_op' and
      pytree_utils.FirstLeafNode(op.children[1]).value == 'not' and
      pytree_utils.LastLeafNode(op.children[1]).value == 'in'):
    return True
  if (isinstance(op.children[1], pytree.Leaf) and
      op.children[1].value in {'==', 'in'}):
    return True
  return False

pytree_utils.FirstLeafNode(node.children[1]),
              ONE_ELEMENT_ARGUMENT)
      elif (pytree_utils.NodeName(node.children[0]) == 'LSQB' and
            len(node.children[1].children) > 2 and
            (name.endswith('_test') or name.endswith('_expr'))):
        _SetStronglyConnected(node.children[1].children[0])
        _SetStronglyConnected(node.children[1].children[2])

        # Still allow splitting around the operator.
        split_before = ((name.endswith('_test') and
                         style.Get('SPLIT_BEFORE_LOGICAL_OPERATOR')) or
                        (name.endswith('_expr') and
                         style.Get('SPLIT_BEFORE_BITWISE_OPERATOR')))
        if split_before:
          _SetSplitPenalty(
              pytree_utils.LastLeafNode(node.children[1].children[1]), 0)
        else:
          _SetSplitPenalty(
              pytree_utils.FirstLeafNode(node.children[1].children[2]), 0)

        # Don't split the ending bracket of a subscript list.
        _SetVeryStronglyConnected(node.children[-1])
      elif name not in {
          'arglist', 'argument', 'term', 'or_test', 'and_test', 'comparison',
          'atom', 'power'
      }:
        # Don't split an argument list with one element if at all possible.
        subtypes = pytree_utils.GetNodeAnnotation(
            pytree_utils.FirstLeafNode(node), pytree_utils.Annotation.SUBTYPE)
        if subtypes and format_token.Subtype.SUBSCRIPT_BRACKET in subtypes:
          _IncreasePenalty(node, SUBSCRIPT)

for trailer in node.children[1:]:
      if pytree_utils.NodeName(trailer) != 'trailer':
        break
      if trailer.children[0].value in '([':
        if len(trailer.children) > 2:
          subtypes = pytree_utils.GetNodeAnnotation(
              trailer.children[0], pytree_utils.Annotation.SUBTYPE)
          if subtypes and format_token.Subtype.SUBSCRIPT_BRACKET in subtypes:
            _SetStronglyConnected(
                pytree_utils.FirstLeafNode(trailer.children[1]))

          last_child_node = pytree_utils.LastLeafNode(trailer)
          if last_child_node.value.strip().startswith('#'):
            last_child_node = last_child_node.prev_sibling
          if not (style.Get('INDENT_CLOSING_BRACKETS') or style.Get('DEDENT_CLOSING_BRACKETS')):
            last = pytree_utils.LastLeafNode(last_child_node.prev_sibling)
            if last.value != ',':
              if last_child_node.value == ']':
                _SetUnbreakable(last_child_node)
              else:
                _SetSplitPenalty(last_child_node, VERY_STRONGLY_CONNECTED)
        else:
          # If the trailer's children are '()', then make it a strongly
          # connected region.  It's sometimes necessary, though undesirable, to
          # split the two.
          _SetStronglyConnected(trailer.children[-1])