class_docstr: Use to turn our docstrings into Markdown.
class_docstr_tok: ["Use","to","turn","our","docstrings","into","Markdown","."]
code: def _preprocess_line(self, node, line, state: ProcessorState) -> str:
      match = re.match(r"#+ (.*)$", line)
      if match:
          state.current_section = Section.from_str(
              match.group(1).strip()
          )
          name = match.group(1).strip()
          slug = (
              (node.name + "." + match.group(1).strip())
              .lower()
              .replace(" ", "_")
          )
          line = f'<h4 id="{slug}">{name}<a class="headerlink" href="#{slug}" title="Permanent link">&para;</a></h4>\n'  # noqa: E501
      else:
          if (
              line
              and not line.startswith(" ")
              and not line.startswith("!!! ")
          ):
              if state.current_section in (
                  Section.ARGUMENTS,
                  Section.PARAMETERS,
              ):
                  param = Param.from_line(line)
                  if param:
                      line = param.to_line()
              elif state.current_section in (
                  Section.ATTRIBUTES,
                  Section.MEMBERS,
              ):
                  attrib = Attrib.from_line(line)
                  if attrib:
                      line = attrib.to_line()
              elif state.current_section in (
                  Section.RETURNS,
                  Section.RAISES,
              ):
                  retval = RetVal.from_line(line)
                  line = retval.to_line()
  
          line = self._transform_cross_references(line)
  
      return line
  
imports: import argparse
  import logging
  import os
  import re
  import sys
  from collections import OrderedDict
  from dataclasses import dataclass
  from enum import Enum
  from multiprocessing import Pool, cpu_count
  from pathlib import Path
  from typing import List, Optional, Tuple
  import docspec
  from docspec import ApiObject, Class, Data, Function, Indirection, Module
  from docspec_python import format_arglist
  from pydoc_markdown import Processor, PydocMarkdown, Resolver
  from pydoc_markdown.contrib.loaders.python import PythonLoader
  from pydoc_markdown.contrib.renderers.markdown import MarkdownRenderer
label_desc: Use image node_id 3 for calling the AllenNlpDocstringProcessor obj's underlying member method code with example usage: obj._preprocess_line(node, line, state) and returns: line