class_docstr: Read notebook cells from R scripts written according
  to the knitr-spin syntax
class_docstr_tok: ["Read","notebook","cells","from","R","scripts","written","according","to","the","knitr-spin","syntax"]
code: def options_to_metadata(self, options):
      return rmd_options_to_metadata("r " + options, self.use_runtools)
  
imports: import re
  import warnings
  from copy import copy
  from nbformat.v4.nbbase import new_code_cell, new_markdown_cell, new_raw_cell
  from packaging.version import parse
  from .doxygen import doxygen_to_markdown
  from .languages import _SCRIPT_EXTENSIONS
  from .cell_metadata import is_active, is_json_metadata, rmd_options_to_metadata, text_to_metadata
  from .languages import _JUPYTER_LANGUAGES_LOWER_AND_UPPER
  from .magics import is_magic, need_explicit_marker, uncomment_magic, unescape_code_start
  from .pep8 import pep8_lines_between_cells
  from .stringparser import StringParser
label_desc: Use image node_id 1 for calling the RScriptCellReader obj's underlying member method code with example usage: obj.options_to_metadata(options) and returns: rmd_options_to_metadata