Custom methods with generic API ------------------------------- In this example the lexer uses a custom end of input handling method based on generic API. The program counts single-quoted strings separated with spaces. It is the same as the `sentinel character with bounds checks`_ example, except that the input is not null-terminated (so this method can be used if it's not possible to have any padding at all, not even a single sentinel character). To cover up for the absence of sentinel character at the end of input, ``YYPEEK`` is redefined to perform a bounds check before it reads the next input character. This is inefficient, because checks are done very often. If the check succeeds, ``YYPEEK`` returns the real character, otherwise it returns a fake sentinel character.