text: # Python LA library
  import ply.lex as lex
  import re 
  
  
  # Javascript tokens
  def t_identifier(token):
      r'[a-zA-Z][\w]*'
      return token
  
  def t_numbers(token):
      r'-?[0-9]+(?:\.[0-9]+)?'
      token.value = float(token.value)
      return token
  
  def t_commnet(token):
      r'//[^\n]*'
      pass
  