code: def _parse_src(cls, src_contents, src_filename):
          
  
          # Parse the source into tokens
          try:
              lexer = guess_lexer_for_filename(src_filename, src_contents)
          except ClassNotFound:
              lexer = TextLexer()
  
          # Ensure that we don't strip newlines from
          # the source file when lexing.
          lexer.stripnl = False
  
          return pygments.lex(src_contents, lexer)
docs: Return a stream of `(token_type, value)` tuples
          parsed from `src_contents` (str)
  
          Uses `src_filename` to guess the type of file
          so it can highlight syntax correctly.