projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3257aa99 DM |
1 | """JSON token scanner\r |
| 2 | """\r | |
| 3 | import re\r | |
| 4 | try:\r | |
| 5 | from _json import make_scanner as c_make_scanner\r | |
| 6 | except ImportError:\r | |
| 7 | c_make_scanner = None\r | |
| 8 | \r | |
| 9 | __all__ = ['make_scanner']\r | |
| 10 | \r | |
| 11 | NUMBER_RE = re.compile(\r | |
| 12 | r'(-?(?:0|[1-9]\d*))(\.\d+)?([eE][-+]?\d+)?',\r | |
| 13 | (re.VERBOSE | re.MULTILINE | re.DOTALL))\r | |
| 14 | \r | |
| 15 | def py_make_scanner(context):\r | |
| 16 | parse_object = context.parse_object\r | |
| 17 | parse_array = context.parse_array\r | |
| 18 | parse_string = context.parse_string\r | |
| 19 | match_number = NUMBER_RE.match\r | |
| 20 | encoding = context.encoding\r | |
| 21 | strict = context.strict\r | |
| 22 | parse_float = context.parse_float\r | |
| 23 | parse_int = context.parse_int\r | |
| 24 | parse_constant = context.parse_constant\r | |
| 25 | object_hook = context.object_hook\r | |
| 26 | object_pairs_hook = context.object_pairs_hook\r | |
| 27 | \r | |
| 28 | def _scan_once(string, idx):\r | |
| 29 | try:\r | |
| 30 | nextchar = string[idx]\r | |
| 31 | except IndexError:\r | |
| 32 | raise StopIteration\r | |
| 33 | \r | |
| 34 | if nextchar == '"':\r | |
| 35 | return parse_string(string, idx + 1, encoding, strict)\r | |
| 36 | elif nextchar == '{':\r | |
| 37 | return parse_object((string, idx + 1), encoding, strict,\r | |
| 38 | _scan_once, object_hook, object_pairs_hook)\r | |
| 39 | elif nextchar == '[':\r | |
| 40 | return parse_array((string, idx + 1), _scan_once)\r | |
| 41 | elif nextchar == 'n' and string[idx:idx + 4] == 'null':\r | |
| 42 | return None, idx + 4\r | |
| 43 | elif nextchar == 't' and string[idx:idx + 4] == 'true':\r | |
| 44 | return True, idx + 4\r | |
| 45 | elif nextchar == 'f' and string[idx:idx + 5] == 'false':\r | |
| 46 | return False, idx + 5\r | |
| 47 | \r | |
| 48 | m = match_number(string, idx)\r | |
| 49 | if m is not None:\r | |
| 50 | integer, frac, exp = m.groups()\r | |
| 51 | if frac or exp:\r | |
| 52 | res = parse_float(integer + (frac or '') + (exp or ''))\r | |
| 53 | else:\r | |
| 54 | res = parse_int(integer)\r | |
| 55 | return res, m.end()\r | |
| 56 | elif nextchar == 'N' and string[idx:idx + 3] == 'NaN':\r | |
| 57 | return parse_constant('NaN'), idx + 3\r | |
| 58 | elif nextchar == 'I' and string[idx:idx + 8] == 'Infinity':\r | |
| 59 | return parse_constant('Infinity'), idx + 8\r | |
| 60 | elif nextchar == '-' and string[idx:idx + 9] == '-Infinity':\r | |
| 61 | return parse_constant('-Infinity'), idx + 9\r | |
| 62 | else:\r | |
| 63 | raise StopIteration\r | |
| 64 | \r | |
| 65 | return _scan_once\r | |
| 66 | \r | |
| 67 | make_scanner = c_make_scanner or py_make_scanner\r |