new_contents: #!/usr/bin/env python3
  
  from viper.parser.ast.generate_nodes_module import generate_text_from_parsed_rules
  from viper.parser.grammar import GRAMMAR_FILE
  from viper.parser.grammar_parsing.parse_grammar import parse_grammar_file
  
  from os.path import dirname, join
  
  
  basedir = dirname(__file__)
  output = join(basedir, 'viper', 'parser', 'ast', 'nodes.py')
  
  
  def generate_nodes_module():
      parsed_rules = parse_grammar_file(GRAMMAR_FILE)
      text = generate_text_from_parsed_rules(parsed_rules)
      with open(output, 'w') as of:
          of.write(text)
  
  
  if __name__ == '__main__':
      generate_nodes_module()
  
subject: Add script to generate nodes.py module for AST