r"""A simple, fast, extensible JSON encoder and decoder

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

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

interchange format.

json exposes an API familiar to uses of the standard library

marshal and pickle modules.

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(u'\u1234')

    "\u1234"

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

    "\\"

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

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

    >>> from StringIO import StringIO

    >>> io = StringIO()

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

    >>> io.getvalue()

    '["streaming API"]'

Compact encoding::

    >>> import json

    >>> json.dumps([1,2,3,{'4': 5, '6': 7}], separators=(',',':'))

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

Pretty printing (using repr() because of extraneous whitespace in the output)::

    >>> import json

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

    '{\n    "4": 5, \n    "6": 7\n}'

Decoding JSON::

    >>> import json

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

    [u'foo', {u'bar': [u'baz', None, 1.0, 2]}]

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

    u'"foo\x08ar'

    >>> from StringIO import StringIO

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

    >>> json.load(io)

    [u'streaming API']

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)

    >>> import decimal

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

    Decimal('1.1')

Extending JSONEncoder::

    >>> import json

    >>> class ComplexEncoder(json.JSONEncoder):

    ...     def default(self, obj):

    ...         if isinstance(obj, complex):

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

    ...         return json.JSONEncoder.default(self, obj)

    ...

    >>> dumps(2 + 1j, cls=ComplexEncoder)

    '[2.0, 1.0]'

    >>> ComplexEncoder().encode(2 + 1j)

    '[2.0, 1.0]'

    >>> list(ComplexEncoder().iterencode(2 + 1j))

    ['[', '2.0', ', ', '1.0', ']']

Using json.tool from the shell to validate and

pretty-print::

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

    {

        "json": "obj"

    }

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

    Expecting property name: line 1 column 2 (char 2)

Note that the JSON produced by this module's default settings

is a subset of YAML, so it may be used as a serializer for that as well.

"""

__version__ = '1.9'

__all__ = [

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

    'JSONDecoder', 'JSONEncoder',

]

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

from .decoder import JSONDecoder

from .encoder import JSONEncoder

_default_encoder = JSONEncoder(

    skipkeys=False,

    ensure_ascii=True,

    check_circular=True,

    allow_nan=True,

    indent=None,

    separators=None,

    encoding='utf-8',

    default=None,

)

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

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

        encoding='utf-8', default=None, **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``, ``unicode``, ``int``, ``long``, ``float``, ``bool``, ``None``)

    will be skipped instead of raising a ``TypeError``.

    If ``ensure_ascii`` is ``False``, then the some chunks written to ``fp``

    may be ``unicode`` instances, subject to normal Python ``str`` to

    ``unicode`` coercion rules. Unless ``fp.write()`` explicitly

    understands ``unicode`` (as in ``codecs.getwriter()``) this is likely

    to cause an error.

    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 ``separators`` is an ``(item_separator, dict_separator)`` tuple

    then it will be used instead of the default ``(', ', ': ')`` separators.

    ``(',', ':')`` is the most compact JSON representation.

    ``encoding`` is the character encoding for str instances, default is UTF-8.

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

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

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

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

    the ``cls`` kwarg.

    """

    # cached encoder

    if (skipkeys is False and ensure_ascii is True and

        check_circular is True and allow_nan is True and

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

        encoding == 'utf-8' and default is None 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, encoding=encoding,

            default=default, **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,

        encoding='utf-8', default=None, **kw):

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

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

    (``str``, ``unicode``, ``int``, ``long``, ``float``, ``bool``, ``None``)

    will be skipped instead of raising a ``TypeError``.

    If ``ensure_ascii`` is ``False``, then the return value will be a

    ``unicode`` instance subject to normal Python ``str`` to ``unicode``

    coercion rules instead of being escaped to an ASCII ``str``.

    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 ``separators`` is an ``(item_separator, dict_separator)`` tuple

    then it will be used instead of the default ``(', ', ': ')`` separators.

    ``(',', ':')`` is the most compact JSON representation.

    ``encoding`` is the character encoding for str instances, default is UTF-8.

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

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

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

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

    the ``cls`` kwarg.

    """

    # cached encoder

    if (skipkeys is False and ensure_ascii is True and

        check_circular is True and allow_nan is True and

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

        encoding == 'utf-8' and default is None 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, encoding=encoding, default=default,

        **kw).encode(obj)

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

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

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

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

    containing a JSON document) to a Python object.

    If the contents of ``fp`` is encoded with an ASCII based encoding other

    than utf-8 (e.g. latin-1), then an appropriate ``encoding`` name must

    be specified. Encodings that are not ASCII based (such as UCS-2) are

    not allowed, and should be wrapped with

    ``codecs.getreader(fp)(encoding)``, or simply decoded to a ``unicode``

    object and passed to ``loads()``

    ``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).

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

    kwarg.

    """

    return loads(fp.read(),

        encoding=encoding, cls=cls, object_hook=object_hook,

        parse_float=parse_float, parse_int=parse_int,

        parse_constant=parse_constant, **kw)

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

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

    """Deserialize ``s`` (a ``str`` or ``unicode`` instance containing a JSON

    document) to a Python object.

    If ``s`` is a ``str`` instance and is encoded with an ASCII based encoding

    other than utf-8 (e.g. latin-1) then an appropriate ``encoding`` name

    must be specified. Encodings that are not ASCII based (such as UCS-2)

    are not allowed and should be decoded to ``unicode`` first.

    ``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).

    ``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. 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. float).

    ``parse_constant``, if specified, will be called with one of the

    following strings: -Infinity, Infinity, NaN, null, true, false.

    This can be used to raise an exception if invalid JSON numbers

    are encountered.

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

    kwarg.

    """

    if (cls is None and encoding is None and object_hook is None and

            parse_int is None and parse_float is None and

            parse_constant is None and not kw):

        return _default_decoder.decode(s)

    if cls is None:

        cls = JSONDecoder

    if object_hook is not None:

        kw['object_hook'] = object_hook

    if parse_float is not None:

        kw['parse_float'] = parse_float

    if parse_int is not None:

        kw['parse_int'] = parse_int

    if parse_constant is not None:

        kw['parse_constant'] = parse_constant

    return cls(encoding=encoding, **kw).decode(s)