Source.Python/addons/source-python/Python3/json/__init__.py at main · CookStar/Source.Python · GitHub

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r"""JSON (JavaScript Object Notation) <http://json.org> is a subset of

JavaScript syntax (ECMA-262 3rd edition) used as a lightweight data

interchange format.

:mod:`json` exposes an API familiar to users of the standard library

:mod:`marshal` and :mod:`pickle` modules. It is derived from a

version of the externally maintained simplejson library.

Encoding basic Python object hierarchies::

>>> import json

>>> json.dumps(['foo', {'bar': ('baz', None, 1.0, 2)}])

'["foo", {"bar": ["baz", null, 1.0, 2]}]'

>>> print(json.dumps("\"foo\bar"))

"\"foo\bar"

>>> print(json.dumps('\u1234'))

"\u1234"

>>> print(json.dumps('\\'))

"\\"

>>> print(json.dumps({"c": 0, "b": 0, "a": 0}, sort_keys=True))

{"a": 0, "b": 0, "c": 0}

>>> from io import StringIO

>>> io = StringIO()

>>> json.dump(['streaming API'], io)

>>> io.getvalue()

'["streaming API"]'

Compact encoding::

>>> import json

>>> from collections import OrderedDict

>>> mydict = OrderedDict([('4', 5), ('6', 7)])

>>> json.dumps([1,2,3,mydict], separators=(',', ':'))

'[1,2,3,{"4":5,"6":7}]'

Pretty printing::

>>> import json

>>> print(json.dumps({'4': 5, '6': 7}, sort_keys=True, indent=4))

{

"4": 5,

"6": 7

}

Decoding JSON::

>>> import json

>>> obj = ['foo', {'bar': ['baz', None, 1.0, 2]}]

>>> json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]') == obj

True

>>> json.loads('"\\"foo\\bar"') == '"foo\x08ar'

True

>>> from io import StringIO

>>> io = StringIO('["streaming API"]')

>>> json.load(io)[0] == 'streaming API'

True

Specializing JSON object decoding::

>>> import json

>>> def as_complex(dct):

... if '__complex__' in dct:

... return complex(dct['real'], dct['imag'])

... return dct

...

>>> json.loads('{"__complex__": true, "real": 1, "imag": 2}',

... object_hook=as_complex)

(1+2j)

>>> from decimal import Decimal

>>> json.loads('1.1', parse_float=Decimal) == Decimal('1.1')

True

Specializing JSON object encoding::

>>> import json

>>> def encode_complex(obj):

... if isinstance(obj, complex):

... return [obj.real, obj.imag]

... raise TypeError(repr(o) + " is not JSON serializable")

...

>>> json.dumps(2 + 1j, default=encode_complex)

'[2.0, 1.0]'

>>> json.JSONEncoder(default=encode_complex).encode(2 + 1j)

'[2.0, 1.0]'

>>> ''.join(json.JSONEncoder(default=encode_complex).iterencode(2 + 1j))

'[2.0, 1.0]'

Using json.tool from the shell to validate and pretty-print::

$ echo '{"json":"obj"}' | python -m json.tool

{

"json": "obj"

}

$ echo '{ 1.2:3.4}' | python -m json.tool

Expecting property name enclosed in double quotes: line 1 column 3 (char 2)

"""

__version__ = '2.0.9'

__all__ = [

'dump', 'dumps', 'load', 'loads',

'JSONDecoder', 'JSONDecodeError', 'JSONEncoder',

]

__author__ = 'Bob Ippolito <bob@redivi.com>'

from .decoder import JSONDecoder, JSONDecodeError

from .encoder import JSONEncoder

import codecs

_default_encoder = JSONEncoder(

skipkeys=False,

ensure_ascii=True,

check_circular=True,

allow_nan=True,

indent=None,

separators=None,

default=None,

)

def dump(obj, fp, *, skipkeys=False, ensure_ascii=True, check_circular=True,

allow_nan=True, cls=None, indent=None, separators=None,

default=None, sort_keys=False, **kw):

"""Serialize ``obj`` as a JSON formatted stream to ``fp`` (a

``.write()``-supporting file-like object).

If ``skipkeys`` is true then ``dict`` keys that are not basic types

(``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped

instead of raising a ``TypeError``.

If ``ensure_ascii`` is false, then the strings written to ``fp`` can

contain non-ASCII characters if they appear in strings contained in

``obj``. Otherwise, all such characters are escaped in JSON strings.

If ``check_circular`` is false, then the circular reference check

for container types will be skipped and a circular reference will

result in an ``OverflowError`` (or worse).

If ``allow_nan`` is false, then it will be a ``ValueError`` to

serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``)

in strict compliance of the JSON specification, instead of using the

JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).

If ``indent`` is a non-negative integer, then JSON array elements and

object members will be pretty-printed with that indent level. An indent

level of 0 will only insert newlines. ``None`` is the most compact

representation.

If specified, ``separators`` should be an ``(item_separator, key_separator)``

tuple. The default is ``(', ', ': ')`` if *indent* is ``None`` and

``(',', ': ')`` otherwise. To get the most compact JSON representation,

you should specify ``(',', ':')`` to eliminate whitespace.

``default(obj)`` is a function that should return a serializable version

of obj or raise TypeError. The default simply raises TypeError.

If *sort_keys* is true (default: ``False``), then the output of

dictionaries will be sorted by key.

To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the

``.default()`` method to serialize additional types), specify it with

the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.

"""

# cached encoder

if (not skipkeys and ensure_ascii and

check_circular and allow_nan and

cls is None and indent is None and separators is None and

default is None and not sort_keys and not kw):

iterable = _default_encoder.iterencode(obj)

else:

if cls is None:

cls = JSONEncoder

iterable = cls(skipkeys=skipkeys, ensure_ascii=ensure_ascii,

check_circular=check_circular, allow_nan=allow_nan, indent=indent,

separators=separators,

default=default, sort_keys=sort_keys, **kw).iterencode(obj)

# could accelerate with writelines in some versions of Python, at

# a debuggability cost

for chunk in iterable:

fp.write(chunk)

def dumps(obj, *, skipkeys=False, ensure_ascii=True, check_circular=True,

allow_nan=True, cls=None, indent=None, separators=None,

default=None, sort_keys=False, **kw):

"""Serialize ``obj`` to a JSON formatted ``str``.

If ``skipkeys`` is true then ``dict`` keys that are not basic types

(``str``, ``int``, ``float``, ``bool``, ``None``) will be skipped

instead of raising a ``TypeError``.

If ``ensure_ascii`` is false, then the return value can contain non-ASCII

characters if they appear in strings contained in ``obj``. Otherwise, all

such characters are escaped in JSON strings.

If ``check_circular`` is false, then the circular reference check

for container types will be skipped and a circular reference will

result in an ``OverflowError`` (or worse).

If ``allow_nan`` is false, then it will be a ``ValueError`` to

serialize out of range ``float`` values (``nan``, ``inf``, ``-inf``) in

strict compliance of the JSON specification, instead of using the

JavaScript equivalents (``NaN``, ``Infinity``, ``-Infinity``).

If ``indent`` is a non-negative integer, then JSON array elements and

object members will be pretty-printed with that indent level. An indent

level of 0 will only insert newlines. ``None`` is the most compact

representation.

If specified, ``separators`` should be an ``(item_separator, key_separator)``

tuple. The default is ``(', ', ': ')`` if *indent* is ``None`` and

``(',', ': ')`` otherwise. To get the most compact JSON representation,

you should specify ``(',', ':')`` to eliminate whitespace.

``default(obj)`` is a function that should return a serializable version

of obj or raise TypeError. The default simply raises TypeError.

If *sort_keys* is true (default: ``False``), then the output of

dictionaries will be sorted by key.

To use a custom ``JSONEncoder`` subclass (e.g. one that overrides the

``.default()`` method to serialize additional types), specify it with

the ``cls`` kwarg; otherwise ``JSONEncoder`` is used.

"""

# cached encoder

if (not skipkeys and ensure_ascii and

check_circular and allow_nan and

cls is None and indent is None and separators is None and

default is None and not sort_keys and not kw):

return _default_encoder.encode(obj)

if cls is None:

cls = JSONEncoder

return cls(

skipkeys=skipkeys, ensure_ascii=ensure_ascii,

check_circular=check_circular, allow_nan=allow_nan, indent=indent,

separators=separators, default=default, sort_keys=sort_keys,

**kw).encode(obj)

_default_decoder = JSONDecoder(object_hook=None, object_pairs_hook=None)

def detect_encoding(b):

bstartswith = b.startswith

if bstartswith((codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE)):

return 'utf-32'

if bstartswith((codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE)):

return 'utf-16'

if bstartswith(codecs.BOM_UTF8):

return 'utf-8-sig'

if len(b) >= 4:

if not b[0]:

# 00 00 -- -- - utf-32-be

# 00 XX -- -- - utf-16-be

return 'utf-16-be' if b[1] else 'utf-32-be'

if not b[1]:

# XX 00 00 00 - utf-32-le

# XX 00 00 XX - utf-16-le

# XX 00 XX -- - utf-16-le

return 'utf-16-le' if b[2] or b[3] else 'utf-32-le'

elif len(b) == 2:

if not b[0]:

# 00 XX - utf-16-be

return 'utf-16-be'

if not b[1]:

# XX 00 - utf-16-le

return 'utf-16-le'

# default

return 'utf-8'

def load(fp, *, cls=None, object_hook=None, parse_float=None,

parse_int=None, parse_constant=None, object_pairs_hook=None, **kw):

"""Deserialize ``fp`` (a ``.read()``-supporting file-like object containing

a JSON document) to a Python object.

``object_hook`` is an optional function that will be called with the

result of any object literal decode (a ``dict``). The return value of

``object_hook`` will be used instead of the ``dict``. This feature

can be used to implement custom decoders (e.g. JSON-RPC class hinting).

``object_pairs_hook`` is an optional function that will be called with the

result of any object literal decoded with an ordered list of pairs. The

return value of ``object_pairs_hook`` will be used instead of the ``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,

collections.OrderedDict will remember the order of insertion). If

``object_hook`` is also defined, the ``object_pairs_hook`` takes priority.

To use a custom ``JSONDecoder`` subclass, specify it with the ``cls``

kwarg; otherwise ``JSONDecoder`` is used.

"""

return loads(fp.read(),

cls=cls, object_hook=object_hook,

parse_float=parse_float, parse_int=parse_int,

parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)

def loads(s, *, encoding=None, cls=None, object_hook=None, parse_float=None,

parse_int=None, parse_constant=None, object_pairs_hook=None, **kw):

"""Deserialize ``s`` (a ``str``, ``bytes`` or ``bytearray`` instance

containing a JSON document) to a Python object.