mirror of
https://github.com/SickGear/SickGear.git
synced 2024-11-22 12:55:05 +00:00
416 lines
15 KiB
Python
416 lines
15 KiB
Python
"""Implementation of JSONDecoder
|
|
"""
|
|
from __future__ import absolute_import
|
|
import re
|
|
import sys
|
|
import struct
|
|
from .compat import PY3, unichr
|
|
from .scanner import make_scanner, JSONDecodeError
|
|
|
|
def _import_c_scanstring():
|
|
try:
|
|
from ._speedups import scanstring
|
|
return scanstring
|
|
except ImportError:
|
|
return None
|
|
c_scanstring = _import_c_scanstring()
|
|
|
|
# NOTE (3.1.0): JSONDecodeError may still be imported from this module for
|
|
# compatibility, but it was never in the __all__
|
|
__all__ = ['JSONDecoder']
|
|
|
|
FLAGS = re.VERBOSE | re.MULTILINE | re.DOTALL
|
|
|
|
def _floatconstants():
|
|
if sys.version_info < (2, 6):
|
|
_BYTES = '7FF80000000000007FF0000000000000'.decode('hex')
|
|
nan, inf = struct.unpack('>dd', _BYTES)
|
|
else:
|
|
nan = float('nan')
|
|
inf = float('inf')
|
|
return nan, inf, -inf
|
|
|
|
NaN, PosInf, NegInf = _floatconstants()
|
|
|
|
_CONSTANTS = {
|
|
'-Infinity': NegInf,
|
|
'Infinity': PosInf,
|
|
'NaN': NaN,
|
|
}
|
|
|
|
STRINGCHUNK = re.compile(r'(.*?)(["\\\x00-\x1f])', FLAGS)
|
|
BACKSLASH = {
|
|
'"': u'"', '\\': u'\\', '/': u'/',
|
|
'b': u'\b', 'f': u'\f', 'n': u'\n', 'r': u'\r', 't': u'\t',
|
|
}
|
|
|
|
DEFAULT_ENCODING = "utf-8"
|
|
|
|
if hasattr(sys, 'get_int_max_str_digits'):
|
|
bounded_int = int
|
|
else:
|
|
def bounded_int(s, INT_MAX_STR_DIGITS=4300):
|
|
"""Backport of the integer string length conversion limitation
|
|
|
|
https://docs.python.org/3/library/stdtypes.html#int-max-str-digits
|
|
"""
|
|
if len(s) > INT_MAX_STR_DIGITS:
|
|
raise ValueError("Exceeds the limit (%s) for integer string conversion: value has %s digits" % (INT_MAX_STR_DIGITS, len(s)))
|
|
return int(s)
|
|
|
|
|
|
def scan_four_digit_hex(s, end, _m=re.compile(r'^[0-9a-fA-F]{4}$').match):
|
|
"""Scan a four digit hex number from s[end:end + 4]
|
|
"""
|
|
msg = "Invalid \\uXXXX escape sequence"
|
|
esc = s[end:end + 4]
|
|
if not _m(esc):
|
|
raise JSONDecodeError(msg, s, end - 2)
|
|
try:
|
|
return int(esc, 16), end + 4
|
|
except ValueError:
|
|
raise JSONDecodeError(msg, s, end - 2)
|
|
|
|
def py_scanstring(s, end, encoding=None, strict=True,
|
|
_b=BACKSLASH, _m=STRINGCHUNK.match, _join=u''.join,
|
|
_PY3=PY3, _maxunicode=sys.maxunicode,
|
|
_scan_four_digit_hex=scan_four_digit_hex):
|
|
"""Scan the string s for a JSON string. End is the index of the
|
|
character in s after the quote that started the JSON string.
|
|
Unescapes all valid JSON string escape sequences and raises ValueError
|
|
on attempt to decode an invalid string. If strict is False then literal
|
|
control characters are allowed in the string.
|
|
|
|
Returns a tuple of the decoded string and the index of the character in s
|
|
after the end quote."""
|
|
if encoding is None:
|
|
encoding = DEFAULT_ENCODING
|
|
chunks = []
|
|
_append = chunks.append
|
|
begin = end - 1
|
|
while 1:
|
|
chunk = _m(s, end)
|
|
if chunk is None:
|
|
raise JSONDecodeError(
|
|
"Unterminated string starting at", s, begin)
|
|
prev_end = end
|
|
end = chunk.end()
|
|
content, terminator = chunk.groups()
|
|
# Content is contains zero or more unescaped string characters
|
|
if content:
|
|
if not _PY3 and not isinstance(content, unicode):
|
|
content = unicode(content, encoding)
|
|
_append(content)
|
|
# Terminator is the end of string, a literal control character,
|
|
# or a backslash denoting that an escape sequence follows
|
|
if terminator == '"':
|
|
break
|
|
elif terminator != '\\':
|
|
if strict:
|
|
msg = "Invalid control character %r at"
|
|
raise JSONDecodeError(msg, s, prev_end)
|
|
else:
|
|
_append(terminator)
|
|
continue
|
|
try:
|
|
esc = s[end]
|
|
except IndexError:
|
|
raise JSONDecodeError(
|
|
"Unterminated string starting at", s, begin)
|
|
# If not a unicode escape sequence, must be in the lookup table
|
|
if esc != 'u':
|
|
try:
|
|
char = _b[esc]
|
|
except KeyError:
|
|
msg = "Invalid \\X escape sequence %r"
|
|
raise JSONDecodeError(msg, s, end)
|
|
end += 1
|
|
else:
|
|
# Unicode escape sequence
|
|
uni, end = _scan_four_digit_hex(s, end + 1)
|
|
# Check for surrogate pair on UCS-4 systems
|
|
# Note that this will join high/low surrogate pairs
|
|
# but will also pass unpaired surrogates through
|
|
if (_maxunicode > 65535 and
|
|
uni & 0xfc00 == 0xd800 and
|
|
s[end:end + 2] == '\\u'):
|
|
uni2, end2 = _scan_four_digit_hex(s, end + 2)
|
|
if uni2 & 0xfc00 == 0xdc00:
|
|
uni = 0x10000 + (((uni - 0xd800) << 10) |
|
|
(uni2 - 0xdc00))
|
|
end = end2
|
|
char = unichr(uni)
|
|
# Append the unescaped character
|
|
_append(char)
|
|
return _join(chunks), end
|
|
|
|
|
|
# Use speedup if available
|
|
scanstring = c_scanstring or py_scanstring
|
|
|
|
WHITESPACE = re.compile(r'[ \t\n\r]*', FLAGS)
|
|
WHITESPACE_STR = ' \t\n\r'
|
|
|
|
def JSONObject(state, encoding, strict, scan_once, object_hook,
|
|
object_pairs_hook, memo=None,
|
|
_w=WHITESPACE.match, _ws=WHITESPACE_STR):
|
|
(s, end) = state
|
|
# Backwards compatibility
|
|
if memo is None:
|
|
memo = {}
|
|
memo_get = memo.setdefault
|
|
pairs = []
|
|
# Use a slice to prevent IndexError from being raised, the following
|
|
# check will raise a more specific ValueError if the string is empty
|
|
nextchar = s[end:end + 1]
|
|
# Normally we expect nextchar == '"'
|
|
if nextchar != '"':
|
|
if nextchar in _ws:
|
|
end = _w(s, end).end()
|
|
nextchar = s[end:end + 1]
|
|
# Trivial empty object
|
|
if nextchar == '}':
|
|
if object_pairs_hook is not None:
|
|
result = object_pairs_hook(pairs)
|
|
return result, end + 1
|
|
pairs = {}
|
|
if object_hook is not None:
|
|
pairs = object_hook(pairs)
|
|
return pairs, end + 1
|
|
elif nextchar != '"':
|
|
raise JSONDecodeError(
|
|
"Expecting property name enclosed in double quotes or '}'",
|
|
s, end)
|
|
end += 1
|
|
while True:
|
|
key, end = scanstring(s, end, encoding, strict)
|
|
key = memo_get(key, key)
|
|
|
|
# To skip some function call overhead we optimize the fast paths where
|
|
# the JSON key separator is ": " or just ":".
|
|
if s[end:end + 1] != ':':
|
|
end = _w(s, end).end()
|
|
if s[end:end + 1] != ':':
|
|
raise JSONDecodeError("Expecting ':' delimiter", s, end)
|
|
|
|
end += 1
|
|
|
|
try:
|
|
if s[end] in _ws:
|
|
end += 1
|
|
if s[end] in _ws:
|
|
end = _w(s, end + 1).end()
|
|
except IndexError:
|
|
pass
|
|
|
|
value, end = scan_once(s, end)
|
|
pairs.append((key, value))
|
|
|
|
try:
|
|
nextchar = s[end]
|
|
if nextchar in _ws:
|
|
end = _w(s, end + 1).end()
|
|
nextchar = s[end]
|
|
except IndexError:
|
|
nextchar = ''
|
|
end += 1
|
|
|
|
if nextchar == '}':
|
|
break
|
|
elif nextchar != ',':
|
|
raise JSONDecodeError("Expecting ',' delimiter or '}'", s, end - 1)
|
|
|
|
try:
|
|
nextchar = s[end]
|
|
if nextchar in _ws:
|
|
end += 1
|
|
nextchar = s[end]
|
|
if nextchar in _ws:
|
|
end = _w(s, end + 1).end()
|
|
nextchar = s[end]
|
|
except IndexError:
|
|
nextchar = ''
|
|
|
|
end += 1
|
|
if nextchar != '"':
|
|
raise JSONDecodeError(
|
|
"Expecting property name enclosed in double quotes",
|
|
s, end - 1)
|
|
|
|
if object_pairs_hook is not None:
|
|
result = object_pairs_hook(pairs)
|
|
return result, end
|
|
pairs = dict(pairs)
|
|
if object_hook is not None:
|
|
pairs = object_hook(pairs)
|
|
return pairs, end
|
|
|
|
def JSONArray(state, scan_once, _w=WHITESPACE.match, _ws=WHITESPACE_STR):
|
|
(s, end) = state
|
|
values = []
|
|
nextchar = s[end:end + 1]
|
|
if nextchar in _ws:
|
|
end = _w(s, end + 1).end()
|
|
nextchar = s[end:end + 1]
|
|
# Look-ahead for trivial empty array
|
|
if nextchar == ']':
|
|
return values, end + 1
|
|
elif nextchar == '':
|
|
raise JSONDecodeError("Expecting value or ']'", s, end)
|
|
_append = values.append
|
|
while True:
|
|
value, end = scan_once(s, end)
|
|
_append(value)
|
|
nextchar = s[end:end + 1]
|
|
if nextchar in _ws:
|
|
end = _w(s, end + 1).end()
|
|
nextchar = s[end:end + 1]
|
|
end += 1
|
|
if nextchar == ']':
|
|
break
|
|
elif nextchar != ',':
|
|
raise JSONDecodeError("Expecting ',' delimiter or ']'", s, end - 1)
|
|
|
|
try:
|
|
if s[end] in _ws:
|
|
end += 1
|
|
if s[end] in _ws:
|
|
end = _w(s, end + 1).end()
|
|
except IndexError:
|
|
pass
|
|
|
|
return values, end
|
|
|
|
class JSONDecoder(object):
|
|
"""Simple JSON <http://json.org> decoder
|
|
|
|
Performs the following translations in decoding by default:
|
|
|
|
+---------------+-------------------+
|
|
| JSON | Python |
|
|
+===============+===================+
|
|
| object | dict |
|
|
+---------------+-------------------+
|
|
| array | list |
|
|
+---------------+-------------------+
|
|
| string | str, unicode |
|
|
+---------------+-------------------+
|
|
| number (int) | int, long |
|
|
+---------------+-------------------+
|
|
| number (real) | float |
|
|
+---------------+-------------------+
|
|
| true | True |
|
|
+---------------+-------------------+
|
|
| false | False |
|
|
+---------------+-------------------+
|
|
| null | None |
|
|
+---------------+-------------------+
|
|
|
|
When allow_nan=True, it also understands
|
|
``NaN``, ``Infinity``, and ``-Infinity`` as
|
|
their corresponding ``float`` values, which is outside the JSON spec.
|
|
|
|
"""
|
|
|
|
def __init__(self, encoding=None, object_hook=None, parse_float=None,
|
|
parse_int=None, parse_constant=None, strict=True,
|
|
object_pairs_hook=None, allow_nan=False):
|
|
"""
|
|
*encoding* determines the encoding used to interpret any
|
|
:class:`str` objects decoded by this instance (``'utf-8'`` by
|
|
default). It has no effect when decoding :class:`unicode` objects.
|
|
|
|
Note that currently only encodings that are a superset of ASCII work,
|
|
strings of other encodings should be passed in as :class:`unicode`.
|
|
|
|
*object_hook*, if specified, will be called with the result of every
|
|
JSON object decoded and its return value will be used in place of the
|
|
given :class:`dict`. This can be used to provide custom
|
|
deserializations (e.g. to support JSON-RPC class hinting).
|
|
|
|
*object_pairs_hook* is an optional function that will be called with
|
|
the result of any object literal decode with an ordered list of pairs.
|
|
The return value of *object_pairs_hook* will be used instead of the
|
|
:class:`dict`. This feature can be used to implement custom decoders
|
|
that rely on the order that the key and value pairs are decoded (for
|
|
example, :func:`collections.OrderedDict` will remember the order of
|
|
insertion). If *object_hook* is also defined, the *object_pairs_hook*
|
|
takes priority.
|
|
|
|
*parse_float*, if specified, will be called with the string of every
|
|
JSON float to be decoded. By default, this is equivalent to
|
|
``float(num_str)``. This can be used to use another datatype or parser
|
|
for JSON floats (e.g. :class:`decimal.Decimal`).
|
|
|
|
*parse_int*, if specified, will be called with the string of every
|
|
JSON int to be decoded. By default, this is equivalent to
|
|
``int(num_str)``. This can be used to use another datatype or parser
|
|
for JSON integers (e.g. :class:`float`).
|
|
|
|
*allow_nan*, if True (default false), will allow the parser to
|
|
accept the non-standard floats ``NaN``, ``Infinity``, and ``-Infinity``.
|
|
|
|
*parse_constant*, if specified, will be
|
|
called with one of the following strings: ``'-Infinity'``,
|
|
``'Infinity'``, ``'NaN'``. It is not recommended to use this feature,
|
|
as it is rare to parse non-compliant JSON containing these values.
|
|
|
|
*strict* controls the parser's behavior when it encounters an
|
|
invalid control character in a string. The default setting of
|
|
``True`` means that unescaped control characters are parse errors, if
|
|
``False`` then control characters will be allowed in strings.
|
|
|
|
"""
|
|
if encoding is None:
|
|
encoding = DEFAULT_ENCODING
|
|
self.encoding = encoding
|
|
self.object_hook = object_hook
|
|
self.object_pairs_hook = object_pairs_hook
|
|
self.parse_float = parse_float or float
|
|
self.parse_int = parse_int or bounded_int
|
|
self.parse_constant = parse_constant or (allow_nan and _CONSTANTS.__getitem__ or None)
|
|
self.strict = strict
|
|
self.parse_object = JSONObject
|
|
self.parse_array = JSONArray
|
|
self.parse_string = scanstring
|
|
self.memo = {}
|
|
self.scan_once = make_scanner(self)
|
|
|
|
def decode(self, s, _w=WHITESPACE.match, _PY3=PY3):
|
|
"""Return the Python representation of ``s`` (a ``str`` or ``unicode``
|
|
instance containing a JSON document)
|
|
|
|
"""
|
|
if _PY3 and isinstance(s, bytes):
|
|
s = str(s, self.encoding)
|
|
obj, end = self.raw_decode(s)
|
|
end = _w(s, end).end()
|
|
if end != len(s):
|
|
raise JSONDecodeError("Extra data", s, end, len(s))
|
|
return obj
|
|
|
|
def raw_decode(self, s, idx=0, _w=WHITESPACE.match, _PY3=PY3):
|
|
"""Decode a JSON document from ``s`` (a ``str`` or ``unicode``
|
|
beginning with a JSON document) and return a 2-tuple of the Python
|
|
representation and the index in ``s`` where the document ended.
|
|
Optionally, ``idx`` can be used to specify an offset in ``s`` where
|
|
the JSON document begins.
|
|
|
|
This can be used to decode a JSON document from a string that may
|
|
have extraneous data at the end.
|
|
|
|
"""
|
|
if idx < 0:
|
|
# Ensure that raw_decode bails on negative indexes, the regex
|
|
# would otherwise mask this behavior. #98
|
|
raise JSONDecodeError('Expecting value', s, idx)
|
|
if _PY3 and not isinstance(s, str):
|
|
raise TypeError("Input string must be text, not bytes")
|
|
# strip UTF-8 bom
|
|
if len(s) > idx:
|
|
ord0 = ord(s[idx])
|
|
if ord0 == 0xfeff:
|
|
idx += 1
|
|
elif ord0 == 0xef and s[idx:idx + 3] == '\xef\xbb\xbf':
|
|
idx += 3
|
|
return self.scan_once(s, idx=_w(s, idx).end())
|