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1"""JSON token scanner2"""3import re4try:5    from _json import make_scanner as c_make_scanner6except ImportError:7    c_make_scanner = None8 9__all__ = ['make_scanner']10 11NUMBER_RE = re.compile(12    r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?',13    (re.VERBOSE | re.MULTILINE | re.DOTALL))14 15def py_make_scanner(context):16    parse_object = context.parse_object17    parse_array = context.parse_array18    parse_string = context.parse_string19    match_number = NUMBER_RE.match20    strict = context.strict21    parse_float = context.parse_float22    parse_int = context.parse_int23    parse_constant = context.parse_constant24    object_hook = context.object_hook25    object_pairs_hook = context.object_pairs_hook26    memo = context.memo27 28    def _scan_once(string, idx):29        try:30            nextchar = string[idx]31        except IndexError:32            raise StopIteration(idx) from None33 34        if nextchar == '"':35            return parse_string(string, idx + 1, strict)36        elif nextchar == '{':37            return parse_object((string, idx + 1), strict,38                _scan_once, object_hook, object_pairs_hook, memo)39        elif nextchar == '[':40            return parse_array((string, idx + 1), _scan_once)41        elif nextchar == 'n' and string[idx:idx + 4] == 'null':42            return None, idx + 443        elif nextchar == 't' and string[idx:idx + 4] == 'true':44            return True, idx + 445        elif nextchar == 'f' and string[idx:idx + 5] == 'false':46            return False, idx + 547 48        m = match_number(string, idx)49        if m is not None:50            integer, frac, exp = m.groups()51            if frac or exp:52                res = parse_float(integer + (frac or '') + (exp or ''))53            else:54                res = parse_int(integer)55            return res, m.end()56        elif nextchar == 'N' and string[idx:idx + 3] == 'NaN':57            return parse_constant('NaN'), idx + 358        elif nextchar == 'I' and string[idx:idx + 8] == 'Infinity':59            return parse_constant('Infinity'), idx + 860        elif nextchar == '-' and string[idx:idx + 9] == '-Infinity':61            return parse_constant('-Infinity'), idx + 962        else:63            raise StopIteration(idx)64 65    def scan_once(string, idx):66        try:67            return _scan_once(string, idx)68        finally:69            memo.clear()70 71    return scan_once72 73make_scanner = c_make_scanner or py_make_scanner74