mirror of https://github.com/morpheus65535/bazarr
271 lines
12 KiB
Python
271 lines
12 KiB
Python
import warnings
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from json import loads as json_loads
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from os import fsync
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from sys import exc_info
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from json_tricks.utils import is_py3, dict_default, gzip_compress, gzip_decompress, JsonTricksDeprecation
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from .utils import str_type, NoNumpyException # keep 'unused' imports
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from .comment import strip_comments # keep 'unused' imports
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#TODO @mark: imports removed?
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from .encoders import TricksEncoder, json_date_time_encode, \
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class_instance_encode, json_complex_encode, json_set_encode, numeric_types_encode, numpy_encode, \
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nonumpy_encode, nopandas_encode, pandas_encode, noenum_instance_encode, \
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enum_instance_encode, pathlib_encode # keep 'unused' imports
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from .decoders import TricksPairHook, \
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json_date_time_hook, ClassInstanceHook, \
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json_complex_hook, json_set_hook, numeric_types_hook, json_numpy_obj_hook, \
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json_nonumpy_obj_hook, \
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nopandas_hook, pandas_hook, EnumInstanceHook, \
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noenum_hook, pathlib_hook, nopathlib_hook # keep 'unused' imports
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ENCODING = 'UTF-8'
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_cih_instance = ClassInstanceHook()
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_eih_instance = EnumInstanceHook()
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DEFAULT_ENCODERS = [json_date_time_encode, json_complex_encode, json_set_encode,
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numeric_types_encode, class_instance_encode, ]
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DEFAULT_HOOKS = [json_date_time_hook, json_complex_hook, json_set_hook,
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numeric_types_hook, _cih_instance, ]
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#TODO @mark: add properties to all built-in encoders (for speed - but it should keep working without)
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try:
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import enum
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except ImportError:
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DEFAULT_ENCODERS = [noenum_instance_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [noenum_hook,] + DEFAULT_HOOKS
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else:
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DEFAULT_ENCODERS = [enum_instance_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [_eih_instance,] + DEFAULT_HOOKS
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try:
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import numpy
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except ImportError:
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DEFAULT_ENCODERS = [nonumpy_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [json_nonumpy_obj_hook,] + DEFAULT_HOOKS
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else:
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# numpy encode needs to be before complex
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DEFAULT_ENCODERS = [numpy_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [json_numpy_obj_hook,] + DEFAULT_HOOKS
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try:
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import pandas
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except ImportError:
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DEFAULT_ENCODERS = [nopandas_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [nopandas_hook,] + DEFAULT_HOOKS
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else:
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DEFAULT_ENCODERS = [pandas_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [pandas_hook,] + DEFAULT_HOOKS
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try:
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import pathlib
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except:
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# No need to include a "nopathlib_encode" hook since we would not encounter
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# the Path object if pathlib isn't available. However, we *could* encounter
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# a serialized Path object (produced by a version of Python with pathlib).
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DEFAULT_HOOKS = [nopathlib_hook,] + DEFAULT_HOOKS
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else:
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DEFAULT_ENCODERS = [pathlib_encode,] + DEFAULT_ENCODERS
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DEFAULT_HOOKS = [pathlib_hook,] + DEFAULT_HOOKS
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DEFAULT_NONP_ENCODERS = [nonumpy_encode,] + DEFAULT_ENCODERS # DEPRECATED
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DEFAULT_NONP_HOOKS = [json_nonumpy_obj_hook,] + DEFAULT_HOOKS # DEPRECATED
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def dumps(obj, sort_keys=None, cls=None, obj_encoders=DEFAULT_ENCODERS, extra_obj_encoders=(),
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primitives=False, compression=None, allow_nan=False, conv_str_byte=False, fallback_encoders=(),
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properties=None, **jsonkwargs):
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"""
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Convert a nested data structure to a json string.
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:param obj: The Python object to convert.
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:param sort_keys: Keep this False if you want order to be preserved.
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:param cls: The json encoder class to use, defaults to NoNumpyEncoder which gives a warning for numpy arrays.
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:param obj_encoders: Iterable of encoders to use to convert arbitrary objects into json-able promitives.
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:param extra_obj_encoders: Like `obj_encoders` but on top of them: use this to add encoders without replacing defaults. Since v3.5 these happen before default encoders.
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:param fallback_encoders: These are extra `obj_encoders` that 1) are ran after all others and 2) only run if the object hasn't yet been changed.
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:param allow_nan: Allow NaN and Infinity values, which is a (useful) violation of the JSON standard (default False).
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:param conv_str_byte: Try to automatically convert between strings and bytes (assuming utf-8) (default False).
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:param properties: A dictionary of properties that is passed to each encoder that will accept it.
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:return: The string containing the json-encoded version of obj.
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Other arguments are passed on to `cls`. Note that `sort_keys` should be false if you want to preserve order.
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"""
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if not hasattr(extra_obj_encoders, '__iter__'):
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raise TypeError('`extra_obj_encoders` should be a tuple in `json_tricks.dump(s)`')
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encoders = tuple(extra_obj_encoders) + tuple(obj_encoders)
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properties = properties or {}
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dict_default(properties, 'primitives', primitives)
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dict_default(properties, 'compression', compression)
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dict_default(properties, 'allow_nan', allow_nan)
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if cls is None:
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cls = TricksEncoder
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txt = cls(sort_keys=sort_keys, obj_encoders=encoders, allow_nan=allow_nan,
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primitives=primitives, fallback_encoders=fallback_encoders,
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properties=properties, **jsonkwargs).encode(obj)
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if not is_py3 and isinstance(txt, str):
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txt = unicode(txt, ENCODING)
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if not compression:
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return txt
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if compression is True:
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compression = 5
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txt = txt.encode(ENCODING)
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gzstring = gzip_compress(txt, compresslevel=compression)
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return gzstring
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def dump(obj, fp, sort_keys=None, cls=None, obj_encoders=DEFAULT_ENCODERS, extra_obj_encoders=(),
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primitives=False, compression=None, force_flush=False, allow_nan=False, conv_str_byte=False,
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fallback_encoders=(), properties=None, **jsonkwargs):
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"""
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Convert a nested data structure to a json string.
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:param fp: File handle or path to write to.
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:param compression: The gzip compression level, or None for no compression.
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:param force_flush: If True, flush the file handle used, when possibly also in the operating system (default False).
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The other arguments are identical to `dumps`.
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"""
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if (isinstance(obj, str_type) or hasattr(obj, 'write')) and isinstance(fp, (list, dict)):
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raise ValueError('json-tricks dump arguments are in the wrong order: provide the data to be serialized before file handle')
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txt = dumps(obj, sort_keys=sort_keys, cls=cls, obj_encoders=obj_encoders, extra_obj_encoders=extra_obj_encoders,
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primitives=primitives, compression=compression, allow_nan=allow_nan, conv_str_byte=conv_str_byte,
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fallback_encoders=fallback_encoders, properties=properties, **jsonkwargs)
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if isinstance(fp, str_type):
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if compression:
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fh = open(fp, 'wb+')
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else:
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fh = open(fp, 'w+')
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else:
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fh = fp
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if conv_str_byte:
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try:
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fh.write(b'')
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except TypeError:
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pass
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# if not isinstance(txt, str_type):
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# # Cannot write bytes, so must be in text mode, but we didn't get a text
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# if not compression:
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# txt = txt.decode(ENCODING)
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else:
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try:
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fh.write(u'')
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except TypeError:
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if isinstance(txt, str_type):
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txt = txt.encode(ENCODING)
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try:
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if compression and 'b' not in getattr(fh, 'mode', 'b?') and not isinstance(txt, str_type):
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raise IOError('If compression is enabled, the file must be opened in binary mode.')
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try:
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fh.write(txt)
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except TypeError as err:
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err.args = (err.args[0] + '. A possible reason is that the file is not opened in binary mode; '
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'be sure to set file mode to something like "wb".',)
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raise
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finally:
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if force_flush:
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fh.flush()
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try:
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if fh.fileno() is not None:
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fsync(fh.fileno())
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except (ValueError,):
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pass
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if isinstance(fp, str_type):
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fh.close()
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return txt
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def loads(string, preserve_order=True, ignore_comments=None, decompression=None, obj_pairs_hooks=DEFAULT_HOOKS,
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extra_obj_pairs_hooks=(), cls_lookup_map=None, allow_duplicates=True, conv_str_byte=False,
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properties=None, **jsonkwargs):
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"""
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Convert a nested data structure to a json string.
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:param string: The string containing a json encoded data structure.
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:param decode_cls_instances: True to attempt to decode class instances (requires the environment to be similar the the encoding one).
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:param preserve_order: Whether to preserve order by using OrderedDicts or not.
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:param ignore_comments: Remove comments (starting with # or //).
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:param decompression: True to use gzip decompression, False to use raw data, None to automatically determine (default). Assumes utf-8 encoding!
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:param obj_pairs_hooks: A list of dictionary hooks to apply.
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:param extra_obj_pairs_hooks: Like `obj_pairs_hooks` but on top of them: use this to add hooks without replacing defaults. Since v3.5 these happen before default hooks.
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:param cls_lookup_map: If set to a dict, for example ``globals()``, then classes encoded from __main__ are looked up this dict.
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:param allow_duplicates: If set to False, an error will be raised when loading a json-map that contains duplicate keys.
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:param parse_float: A function to parse strings to integers (e.g. Decimal). There is also `parse_int`.
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:param conv_str_byte: Try to automatically convert between strings and bytes (assuming utf-8) (default False).
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:return: The string containing the json-encoded version of obj.
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Other arguments are passed on to json_func.
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"""
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if not hasattr(extra_obj_pairs_hooks, '__iter__'):
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raise TypeError('`extra_obj_pairs_hooks` should be a tuple in `json_tricks.load(s)`')
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if decompression is None:
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decompression = isinstance(string, bytes) and string[:2] == b'\x1f\x8b'
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if decompression:
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string = gzip_decompress(string).decode(ENCODING)
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if not isinstance(string, str_type):
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if conv_str_byte:
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string = string.decode(ENCODING)
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else:
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raise TypeError(('The input was of non-string type "{0:}" in `json_tricks.load(s)`. '
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'Bytes cannot be automatically decoding since the encoding is not known. Recommended '
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'way is to instead encode the bytes to a string and pass that string to `load(s)`, '
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'for example bytevar.encode("utf-8") if utf-8 is the encoding. Alternatively you can '
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'force an attempt by passing conv_str_byte=True, but this may cause decoding issues.')
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.format(type(string)))
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if ignore_comments or ignore_comments is None:
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new_string = strip_comments(string)
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if ignore_comments is None and not getattr(loads, '_ignore_comments_warned', False) and string != new_string:
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warnings.warn('`json_tricks.load(s)` stripped some comments, but `ignore_comments` was '
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'not passed; in the next major release, the behaviour when `ignore_comments` is not '
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'passed will change; it is recommended to explicitly pass `ignore_comments=True` if '
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'you want to strip comments; see https://github.com/mverleg/pyjson_tricks/issues/74',
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JsonTricksDeprecation)
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loads._ignore_comments_warned = True
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string = new_string
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properties = properties or {}
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dict_default(properties, 'preserve_order', preserve_order)
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dict_default(properties, 'ignore_comments', ignore_comments)
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dict_default(properties, 'decompression', decompression)
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dict_default(properties, 'cls_lookup_map', cls_lookup_map)
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dict_default(properties, 'allow_duplicates', allow_duplicates)
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hooks = tuple(extra_obj_pairs_hooks) + tuple(obj_pairs_hooks)
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hook = TricksPairHook(ordered=preserve_order, obj_pairs_hooks=hooks, allow_duplicates=allow_duplicates, properties=properties)
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return json_loads(string, object_pairs_hook=hook, **jsonkwargs)
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def load(fp, preserve_order=True, ignore_comments=None, decompression=None, obj_pairs_hooks=DEFAULT_HOOKS,
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extra_obj_pairs_hooks=(), cls_lookup_map=None, allow_duplicates=True, conv_str_byte=False,
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properties=None, **jsonkwargs):
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"""
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Convert a nested data structure to a json string.
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:param fp: File handle or path to load from.
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The other arguments are identical to loads.
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"""
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try:
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if isinstance(fp, str_type):
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if decompression is not None:
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open_binary = bool(decompression)
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else:
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with open(fp, 'rb') as fh:
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# This attempts to detect gzip mode; gzip should always
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# have this header, and text json can't have it.
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open_binary = (fh.read(2) == b'\x1f\x8b')
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with open(fp, 'rb' if open_binary else 'r') as fh:
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string = fh.read()
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else:
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string = fp.read()
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except UnicodeDecodeError as err:
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# todo: not covered in tests, is it relevant?
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raise Exception('There was a problem decoding the file content. A possible reason is that the file is not ' +
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'opened in binary mode; be sure to set file mode to something like "rb".').with_traceback(exc_info()[2])
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return loads(string, preserve_order=preserve_order, ignore_comments=ignore_comments, decompression=decompression,
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obj_pairs_hooks=obj_pairs_hooks, extra_obj_pairs_hooks=extra_obj_pairs_hooks, cls_lookup_map=cls_lookup_map,
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allow_duplicates=allow_duplicates, conv_str_byte=conv_str_byte, properties=properties, **jsonkwargs)
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