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