code: def _scriptDefinition(self, script):
      stag = script.tag
      for lang in script.langs:
          ltag = lang.tag
          for feature in lang.features:
              lookups = {
                  l.split("\\")[0]: True for l in feature.lookups
              }
              ftag = feature.tag
              if ftag not in self._features:
                  self._features[ftag] = {}
              if stag not in self._features[ftag]:
                  self._features[ftag][stag] = {}
              assert ltag not in self._features[ftag][stag]
              self._features[ftag][stag][ltag] = lookups.keys()
  
imports: import logging
  import re
  from io import StringIO
  from fontTools.feaLib import ast
  from fontTools.ttLib import TTFont, TTLibError
  from fontTools.voltLib import ast
  from fontTools.voltLib.parser import Parser
label_desc: Use image node_id 14 for calling the VoltToFea obj's underlying member method code with example usage: obj._scriptDefinition(script) without return types