new_contents: ##
  # Copyright (c) 2016 MagicStack Inc.
  # All rights reserved.
  #
  # See LICENSE for details.
  ##
  
  
  import re
  
  from .parser.grammar import keywords
  
  
  _re_ident = re.compile(r'(?:[^\W\d]|\$)(?:\w|\$)*')
  
  
  def quote_literal(text):
      return "'" + text.replace("'", R"\'") + "'"
  
  
  def dollar_quote_literal(text):
      quote = '$$'
      qq = 0
  
      while quote in text:
          if qq % 16 < 10:
              qq += 10 - qq % 16
  
          quote = '${:x}$'.format(qq)[::-1]
          qq += 1
  
      return quote + text + quote
  
  
  def disambiguate_identifier(text):
      if (keywords.edge_schema_keywords.get(text)
              or not _re_ident.fullmatch(text)):
          return '`{}`'.format(text)
      else:
          return text
  
subject: Fix missing quoting module for schema.