code: def run(self):
      env = self.state.document.settings.env
  
      targetid = "pdvega-plot-{0}".format(
          env.new_serialno("pdvega-plot")
      )
      targetnode = nodes.target("", "", ids=[targetid])
  
      code = "\n".join(self.content)
  
      # Here we cache the code for use in later setup
      if not hasattr(env, "pdvega_plot_setup"):
          env.pdvega_plot_setup = []
      env.pdvega_plot_setup.append(
          {
              "docname": env.docname,
              "lineno": self.lineno,
              "code": code,
              "target": targetnode,
          }
      )
  
      result = [targetnode]
  
      if "show" in self.options:
          source_literal = nodes.literal_block(code, code)
          source_literal["language"] = "python"
          result.append(source_literal)
  
      return result
  
imports: import os
  import json
  import warnings
  import jinja2
  from docutils import nodes
  from docutils.parsers.rst import Directive
  from docutils.parsers.rst.directives import flag, unchanged
  from sphinx.locale import _
  from pdvega import Axes
  from .utils import exec_then_eval
label_desc: Use image node_id 1 for calling the PdVegaSetupDirective obj's underlying member method code with example usage: obj.run() and returns: result