Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/simplejson/scanner.py: 17%

1"""JSON token scanner 

2""" 

3import re 

4from .errors import JSONDecodeError 

5def _import_c_make_scanner(): 

6 try: 

7 from ._speedups import make_scanner 

8 return make_scanner 

9 except ImportError: 

10 return None 

11c_make_scanner = _import_c_make_scanner() 

12 

13__all__ = ['make_scanner', 'JSONDecodeError'] 

14 

15NUMBER_RE = re.compile( 

16 r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?', 

17 (re.VERBOSE | re.MULTILINE | re.DOTALL)) 

18 

19 

20def py_make_scanner(context): 

21 parse_object = context.parse_object 

22 parse_array = context.parse_array 

23 parse_string = context.parse_string 

24 match_number = NUMBER_RE.match 

25 encoding = context.encoding 

26 strict = context.strict 

27 parse_float = context.parse_float 

28 parse_int = context.parse_int 

29 parse_constant = context.parse_constant 

30 object_hook = context.object_hook 

31 object_pairs_hook = context.object_pairs_hook 

32 memo = context.memo 

33 

34 def _scan_once(string, idx): 

35 errmsg = 'Expecting value' 

36 try: 

37 nextchar = string[idx] 

38 except IndexError: 

39 raise JSONDecodeError(errmsg, string, idx) 

40 

41 if nextchar == '"': 

42 return parse_string(string, idx + 1, encoding, strict) 

43 elif nextchar == '{': 

44 return parse_object((string, idx + 1), encoding, strict, 

45 _scan_once, object_hook, object_pairs_hook, memo) 

46 elif nextchar == '[': 

47 return parse_array((string, idx + 1), _scan_once) 

48 elif nextchar == 'n' and string[idx:idx + 4] == 'null': 

49 return None, idx + 4 

50 elif nextchar == 't' and string[idx:idx + 4] == 'true': 

51 return True, idx + 4 

52 elif nextchar == 'f' and string[idx:idx + 5] == 'false': 

53 return False, idx + 5 

54 

55 m = match_number(string, idx) 

56 if m is not None: 

57 integer, frac, exp = m.groups() 

58 if frac or exp: 

59 res = parse_float(integer + (frac or '') + (exp or '')) 

60 else: 

61 res = parse_int(integer) 

62 return res, m.end() 

63 elif parse_constant and nextchar == 'N' and string[idx:idx + 3] == 'NaN': 

64 return parse_constant('NaN'), idx + 3 

65 elif parse_constant and nextchar == 'I' and string[idx:idx + 8] == 'Infinity': 

66 return parse_constant('Infinity'), idx + 8 

67 elif parse_constant and nextchar == '-' and string[idx:idx + 9] == '-Infinity': 

68 return parse_constant('-Infinity'), idx + 9 

69 else: 

70 raise JSONDecodeError(errmsg, string, idx) 

71 

72 def scan_once(string, idx): 

73 if idx < 0: 

74 # Ensure the same behavior as the C speedup, otherwise 

75 # this would work for *some* negative string indices due 

76 # to the behavior of __getitem__ for strings. #98 

77 raise JSONDecodeError('Expecting value', string, idx) 

78 try: 

79 return _scan_once(string, idx) 

80 finally: 

81 memo.clear() 

82 

83 return scan_once 

84 

85make_scanner = c_make_scanner or py_make_scanner