[irc/quakenet/qwebirc.git] / esimplejson / encoder.py

"""
Implementation of JSONEncoder
"""
import re

try:
    from esimplejson._speedups import encode_basestring_ascii as c_encode_basestring_ascii
except ImportError:
    pass

ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')
ESCAPE_ASCII = re.compile(r'([\\"]|[^\ -~])')
HAS_UTF8 = re.compile(r'[\x80-\xff]')
ESCAPE_DCT = {
    '\\': '\\\\',
    '"': '\\"',
    '\b': '\\b',
    '\f': '\\f',
    '\n': '\\n',
    '\r': '\\r',
    '\t': '\\t',
}
for i in range(0x20):
    ESCAPE_DCT.setdefault(chr(i), '\\u%04x' % (i,))

# Assume this produces an infinity on all machines (probably not guaranteed)
INFINITY = float('1e66666')
FLOAT_REPR = repr

def floatstr(o, allow_nan=True):
    # Check for specials.  Note that this type of test is processor- and/or
    # platform-specific, so do tests which don't depend on the internals.

    if o != o:
        text = 'NaN'
    elif o == INFINITY:
        text = 'Infinity'
    elif o == -INFINITY:
        text = '-Infinity'
    else:
        return FLOAT_REPR(o)

    if not allow_nan:
        raise ValueError("Out of range float values are not JSON compliant: %r"
            % (o,))

    return text


def encode_basestring(s):
    """
    Return a JSON representation of a Python string
    """
    def replace(match):
        return ESCAPE_DCT[match.group(0)]
    return '"' + ESCAPE.sub(replace, s) + '"'


def py_encode_basestring_ascii(s):
    if isinstance(s, str) and HAS_UTF8.search(s) is not None:
        s = s.decode('utf-8')
    def replace(match):
        s = match.group(0)
        try:
            return ESCAPE_DCT[s]
        except KeyError:
            n = ord(s)
            if n < 0x10000:
                return '\\u%04x' % (n,)
            else:
                # surrogate pair
                n -= 0x10000
                s1 = 0xd800 | ((n >> 10) & 0x3ff)
                s2 = 0xdc00 | (n & 0x3ff)
                return '\\u%04x\\u%04x' % (s1, s2)
    return '"' + str(ESCAPE_ASCII.sub(replace, s)) + '"'


try:
    encode_basestring_ascii = c_encode_basestring_ascii
except NameError:
    encode_basestring_ascii = py_encode_basestring_ascii


class JSONEncoder(object):
    """
    Extensible JSON <http://json.org> encoder for Python data structures.

    Supports the following objects and types by default:
    
    +-------------------+---------------+
    | Python            | JSON          |
    +===================+===============+
    | dict              | object        |
    +-------------------+---------------+
    | list, tuple       | array         |
    +-------------------+---------------+
    | str, unicode      | string        |
    +-------------------+---------------+
    | int, long, float  | number        |
    +-------------------+---------------+
    | True              | true          |
    +-------------------+---------------+
    | False             | false         |
    +-------------------+---------------+
    | None              | null          |
    +-------------------+---------------+

    To extend this to recognize other objects, subclass and implement a
    ``.default()`` method with another method that returns a serializable
    object for ``o`` if possible, otherwise it should call the superclass
    implementation (to raise ``TypeError``).
    """
    __all__ = ['__init__', 'default', 'encode', 'iterencode']
    item_separator = ', '
    key_separator = ': '
    def __init__(self, skipkeys=False, ensure_ascii=True,
            check_circular=True, allow_nan=True, sort_keys=False,
            indent=None, separators=None, encoding='utf-8', default=None):
        """
        Constructor for JSONEncoder, with sensible defaults.

        If skipkeys is False, then it is a TypeError to attempt
        encoding of keys that are not str, int, long, float or None.  If
        skipkeys is True, such items are simply skipped.

        If ensure_ascii is True, the output is guaranteed to be str
        objects with all incoming unicode characters escaped.  If
        ensure_ascii is false, the output will be unicode object.

        If check_circular is True, then lists, dicts, and custom encoded
        objects will be checked for circular references during encoding to
        prevent an infinite recursion (which would cause an OverflowError).
        Otherwise, no such check takes place.

        If allow_nan is True, then NaN, Infinity, and -Infinity will be
        encoded as such.  This behavior is not JSON specification compliant,
        but is consistent with most JavaScript based encoders and decoders.
        Otherwise, it will be a ValueError to encode such floats.

        If sort_keys is True, then the output of dictionaries will be
        sorted by key; this is useful for regression tests to ensure
        that JSON serializations can be compared on a day-to-day basis.

        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 a (item_separator, key_separator)
        tuple.  The default is (', ', ': ').  To get the most compact JSON
        representation you should specify (',', ':') to eliminate whitespace.

        If specified, default is a function that gets called for objects
        that can't otherwise be serialized.  It should return a JSON encodable
        version of the object or raise a ``TypeError``.

        If encoding is not None, then all input strings will be
        transformed into unicode using that encoding prior to JSON-encoding.
        The default is UTF-8.
        """

        self.skipkeys = skipkeys
        self.ensure_ascii = ensure_ascii
        self.check_circular = check_circular
        self.allow_nan = allow_nan
        self.sort_keys = sort_keys
        self.indent = indent
        self.current_indent_level = 0
        if separators is not None:
            self.item_separator, self.key_separator = separators
        if default is not None:
            self.default = default
        self.encoding = encoding

    def _newline_indent(self):
        return '\n' + (' ' * (self.indent * self.current_indent_level))

    def _iterencode_list(self, lst, markers=None):
        if not lst:
            yield '[]'
            return
        if markers is not None:
            markerid = id(lst)
            if markerid in markers:
                raise ValueError("Circular reference detected")
            markers[markerid] = lst
        yield '['
        if self.indent is not None:
            self.current_indent_level += 1
            newline_indent = self._newline_indent()
            separator = self.item_separator + newline_indent
            yield newline_indent
        else:
            newline_indent = None
            separator = self.item_separator
        first = True
        for value in lst:
            if first:
                first = False
            else:
                yield separator
            for chunk in self._iterencode(value, markers):
                yield chunk
        if newline_indent is not None:
            self.current_indent_level -= 1
            yield self._newline_indent()
        yield ']'
        if markers is not None:
            del markers[markerid]

    def _iterencode_dict(self, dct, markers=None):
        if not dct:
            yield '{}'
            return
        if markers is not None:
            markerid = id(dct)
            if markerid in markers:
                raise ValueError("Circular reference detected")
            markers[markerid] = dct
        yield '{'
        key_separator = self.key_separator
        if self.indent is not None:
            self.current_indent_level += 1
            newline_indent = self._newline_indent()
            item_separator = self.item_separator + newline_indent
            yield newline_indent
        else:
            newline_indent = None
            item_separator = self.item_separator
        first = True
        if self.ensure_ascii:
            encoder = encode_basestring_ascii
        else:
            encoder = encode_basestring
        allow_nan = self.allow_nan
        if self.sort_keys:
            keys = dct.keys()
            keys.sort()
            items = [(k, dct[k]) for k in keys]
        else:
            items = dct.iteritems()
        _encoding = self.encoding
        _do_decode = (_encoding is not None
            and not (_encoding == 'utf-8'))
        for key, value in items:
            if isinstance(key, str):
                if _do_decode:
                    key = key.decode(_encoding)
            elif isinstance(key, basestring):
                pass
            # JavaScript is weakly typed for these, so it makes sense to
            # also allow them.  Many encoders seem to do something like this.
            elif isinstance(key, float):
                key = floatstr(key, allow_nan)
            elif isinstance(key, (int, long)):
                key = str(key)
            elif key is True:
                key = 'true'
            elif key is False:
                key = 'false'
            elif key is None:
                key = 'null'
            elif self.skipkeys:
                continue
            else:
                raise TypeError("key %r is not a string" % (key,))
            if first:
                first = False
            else:
                yield item_separator
            yield encoder(key)
            yield key_separator
            for chunk in self._iterencode(value, markers):
                yield chunk
        if newline_indent is not None:
            self.current_indent_level -= 1
            yield self._newline_indent()
        yield '}'
        if markers is not None:
            del markers[markerid]

    def _iterencode(self, o, markers=None):
        if isinstance(o, basestring):
            if self.ensure_ascii:
                encoder = encode_basestring_ascii
            else:
                encoder = encode_basestring
            _encoding = self.encoding
            if (_encoding is not None and isinstance(o, str)
                    and not (_encoding == 'utf-8')):
                o = o.decode(_encoding)
            yield encoder(o)
        elif o is None:
            yield 'null'
        elif o is True:
            yield 'true'
        elif o is False:
            yield 'false'
        elif isinstance(o, (int, long)):
            yield str(o)
        elif isinstance(o, float):
            yield floatstr(o, self.allow_nan)
        elif isinstance(o, (list, tuple)):
            for chunk in self._iterencode_list(o, markers):
                yield chunk
        elif isinstance(o, dict):
            for chunk in self._iterencode_dict(o, markers):
                yield chunk
        else:
            if markers is not None:
                markerid = id(o)
                if markerid in markers:
                    raise ValueError("Circular reference detected")
                markers[markerid] = o
            for chunk in self._iterencode_default(o, markers):
                yield chunk
            if markers is not None:
                del markers[markerid]

    def _iterencode_default(self, o, markers=None):
        newobj = self.default(o)
        return self._iterencode(newobj, markers)

    def default(self, o):
        """
        Implement this method in a subclass such that it returns
        a serializable object for ``o``, or calls the base implementation
        (to raise a ``TypeError``).

        For example, to support arbitrary iterators, you could
        implement default like this::
            
            def default(self, o):
                try:
                    iterable = iter(o)
                except TypeError:
                    pass
                else:
                    return list(iterable)
                return JSONEncoder.default(self, o)
        """
        raise TypeError("%r is not JSON serializable" % (o,))

    def encode(self, o):
        """
        Return a JSON string representation of a Python data structure.

        >>> JSONEncoder().encode({"foo": ["bar", "baz"]})
        '{"foo": ["bar", "baz"]}'
        """
        # This is for extremely simple cases and benchmarks.
        if isinstance(o, basestring):
            if isinstance(o, str):
                _encoding = self.encoding
                if (_encoding is not None 
                        and not (_encoding == 'utf-8')):
                    o = o.decode(_encoding)
            if self.ensure_ascii:
                return encode_basestring_ascii(o)
            else:
                return encode_basestring(o)
        # This doesn't pass the iterator directly to ''.join() because the
        # exceptions aren't as detailed.  The list call should be roughly
        # equivalent to the PySequence_Fast that ''.join() would do.
        chunks = list(self.iterencode(o))
        return ''.join(chunks)

    def iterencode(self, o):
        """
        Encode the given object and yield each string
        representation as available.
        
        For example::
            
            for chunk in JSONEncoder().iterencode(bigobject):
                mysocket.write(chunk)
        """
        if self.check_circular:
            markers = {}
        else:
            markers = None
        return self._iterencode(o, markers)

__all__ = ['JSONEncoder']
Commit	Line	Data
4d256d41 CP	1	"""
	2	Implementation of JSONEncoder
	3	"""
	4	import re
	5
	6	try:
becfa850	7	from esimplejson._speedups import encode_basestring_ascii as c_encode_basestring_ascii
4d256d41 CP	8	except ImportError:
	9	pass
	10
	11	ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')
	12	ESCAPE_ASCII = re.compile(r'([\\"]\|[^\ -~])')
	13	HAS_UTF8 = re.compile(r'[\x80-\xff]')
	14	ESCAPE_DCT = {
	15	'\\': '\\\\',
	16	'"': '\\"',
	17	'\b': '\\b',
	18	'\f': '\\f',
	19	'\n': '\\n',
	20	'\r': '\\r',
	21	'\t': '\\t',
	22	}
	23	for i in range(0x20):
	24	ESCAPE_DCT.setdefault(chr(i), '\\u%04x' % (i,))
	25
	26	# Assume this produces an infinity on all machines (probably not guaranteed)
	27	INFINITY = float('1e66666')
	28	FLOAT_REPR = repr
	29
	30	def floatstr(o, allow_nan=True):
	31	# Check for specials. Note that this type of test is processor- and/or
	32	# platform-specific, so do tests which don't depend on the internals.
	33
	34	if o != o:
	35	text = 'NaN'
	36	elif o == INFINITY:
	37	text = 'Infinity'
	38	elif o == -INFINITY:
	39	text = '-Infinity'
	40	else:
	41	return FLOAT_REPR(o)
	42
	43	if not allow_nan:
	44	raise ValueError("Out of range float values are not JSON compliant: %r"
	45	% (o,))
	46
	47	return text
	48
	49
	50	def encode_basestring(s):
	51	"""
	52	Return a JSON representation of a Python string
	53	"""
	54	def replace(match):
	55	return ESCAPE_DCT[match.group(0)]
	56	return '"' + ESCAPE.sub(replace, s) + '"'
	57
	58
	59	def py_encode_basestring_ascii(s):
	60	if isinstance(s, str) and HAS_UTF8.search(s) is not None:
	61	s = s.decode('utf-8')
	62	def replace(match):
	63	s = match.group(0)
	64	try:
	65	return ESCAPE_DCT[s]
	66	except KeyError:
	67	n = ord(s)
	68	if n < 0x10000:
	69	return '\\u%04x' % (n,)
	70	else:
	71	# surrogate pair
72	n -= 0x10000
73	s1 = 0xd800 \| ((n >> 10) & 0x3ff)
74	s2 = 0xdc00 \| (n & 0x3ff)
75	return '\\u%04x\\u%04x' % (s1, s2)
76	return '"' + str(ESCAPE_ASCII.sub(replace, s)) + '"'
77
78
79	try:
80	encode_basestring_ascii = c_encode_basestring_ascii
81	except NameError:
82	encode_basestring_ascii = py_encode_basestring_ascii
83
84
85	class JSONEncoder(object):
86	"""
87	Extensible JSON <http://json.org> encoder for Python data structures.
88
89	Supports the following objects and types by default:
90
91	+-------------------+---------------+
92	\| Python \| JSON \|
93	+===================+===============+
94	\| dict \| object \|
95	+-------------------+---------------+
96	\| list, tuple \| array \|
97	+-------------------+---------------+
98	\| str, unicode \| string \|
99	+-------------------+---------------+
100	\| int, long, float \| number \|
101	+-------------------+---------------+
102	\| True \| true \|
103	+-------------------+---------------+
104	\| False \| false \|
105	+-------------------+---------------+
106	\| None \| null \|
107	+-------------------+---------------+
108
109	To extend this to recognize other objects, subclass and implement a
110	``.default()`` method with another method that returns a serializable
111	object for ``o`` if possible, otherwise it should call the superclass
112	implementation (to raise ``TypeError``).
113	"""
114	__all__ = ['__init__', 'default', 'encode', 'iterencode']
115	item_separator = ', '
116	key_separator = ': '
117	def __init__(self, skipkeys=False, ensure_ascii=True,
118	check_circular=True, allow_nan=True, sort_keys=False,
119	indent=None, separators=None, encoding='utf-8', default=None):
120	"""
121	Constructor for JSONEncoder, with sensible defaults.
122
123	If skipkeys is False, then it is a TypeError to attempt
124	encoding of keys that are not str, int, long, float or None. If
125	skipkeys is True, such items are simply skipped.
126
127	If ensure_ascii is True, the output is guaranteed to be str
128	objects with all incoming unicode characters escaped. If
129	ensure_ascii is false, the output will be unicode object.
130
131	If check_circular is True, then lists, dicts, and custom encoded
132	objects will be checked for circular references during encoding to
133	prevent an infinite recursion (which would cause an OverflowError).
134	Otherwise, no such check takes place.
135
136	If allow_nan is True, then NaN, Infinity, and -Infinity will be
137	encoded as such. This behavior is not JSON specification compliant,
138	but is consistent with most JavaScript based encoders and decoders.
139	Otherwise, it will be a ValueError to encode such floats.
140
141	If sort_keys is True, then the output of dictionaries will be
142	sorted by key; this is useful for regression tests to ensure
143	that JSON serializations can be compared on a day-to-day basis.
144
145	If indent is a non-negative integer, then JSON array
146	elements and object members will be pretty-printed with that
147	indent level. An indent level of 0 will only insert newlines.
148	None is the most compact representation.
149
150	If specified, separators should be a (item_separator, key_separator)
151	tuple. The default is (', ', ': '). To get the most compact JSON
152	representation you should specify (',', ':') to eliminate whitespace.
153
154	If specified, default is a function that gets called for objects
155	that can't otherwise be serialized. It should return a JSON encodable
156	version of the object or raise a ``TypeError``.
157
158	If encoding is not None, then all input strings will be
159	transformed into unicode using that encoding prior to JSON-encoding.
160	The default is UTF-8.
161	"""
162
163	self.skipkeys = skipkeys
164	self.ensure_ascii = ensure_ascii
165	self.check_circular = check_circular
166	self.allow_nan = allow_nan
167	self.sort_keys = sort_keys
168	self.indent = indent
169	self.current_indent_level = 0
170	if separators is not None:
171	self.item_separator, self.key_separator = separators
172	if default is not None:
173	self.default = default
174	self.encoding = encoding
175
176	def _newline_indent(self):
177	return '\n' + (' ' * (self.indent * self.current_indent_level))
178
179	def _iterencode_list(self, lst, markers=None):
180	if not lst:
181	yield '[]'
182	return
183	if markers is not None:
184	markerid = id(lst)
185	if markerid in markers:
186	raise ValueError("Circular reference detected")
187	markers[markerid] = lst
188	yield '['
189	if self.indent is not None:
190	self.current_indent_level += 1
191	newline_indent = self._newline_indent()
192	separator = self.item_separator + newline_indent
193	yield newline_indent
194	else:
195	newline_indent = None
196	separator = self.item_separator
197	first = True
198	for value in lst:
199	if first:
200	first = False
201	else:
202	yield separator
203	for chunk in self._iterencode(value, markers):
204	yield chunk
205	if newline_indent is not None:
206	self.current_indent_level -= 1
207	yield self._newline_indent()
208	yield ']'
209	if markers is not None:
210	del markers[markerid]
211
212	def _iterencode_dict(self, dct, markers=None):
213	if not dct:
214	yield '{}'
215	return
216	if markers is not None:
217	markerid = id(dct)
218	if markerid in markers:
219	raise ValueError("Circular reference detected")
220	markers[markerid] = dct
221	yield '{'
222	key_separator = self.key_separator
223	if self.indent is not None:
224	self.current_indent_level += 1
225	newline_indent = self._newline_indent()
226	item_separator = self.item_separator + newline_indent
227	yield newline_indent
228	else:
229	newline_indent = None
230	item_separator = self.item_separator
231	first = True
232	if self.ensure_ascii:
233	encoder = encode_basestring_ascii
234	else:
235	encoder = encode_basestring
236	allow_nan = self.allow_nan
237	if self.sort_keys:
238	keys = dct.keys()
239	keys.sort()
240	items = [(k, dct[k]) for k in keys]
241	else:
242	items = dct.iteritems()
243	_encoding = self.encoding
244	_do_decode = (_encoding is not None
245	and not (_encoding == 'utf-8'))
246	for key, value in items:
247	if isinstance(key, str):
248	if _do_decode:
249	key = key.decode(_encoding)
250	elif isinstance(key, basestring):
251	pass
252	# JavaScript is weakly typed for these, so it makes sense to
253	# also allow them. Many encoders seem to do something like this.
254	elif isinstance(key, float):
255	key = floatstr(key, allow_nan)
256	elif isinstance(key, (int, long)):
257	key = str(key)
258	elif key is True:
259	key = 'true'
260	elif key is False:
261	key = 'false'
262	elif key is None:
263	key = 'null'
264	elif self.skipkeys:
265	continue
266	else:
267	raise TypeError("key %r is not a string" % (key,))
268	if first:
269	first = False
270	else:
271	yield item_separator
272	yield encoder(key)
273	yield key_separator
274	for chunk in self._iterencode(value, markers):
275	yield chunk
276	if newline_indent is not None:
277	self.current_indent_level -= 1
278	yield self._newline_indent()
279	yield '}'
280	if markers is not None:
281	del markers[markerid]
282
283	def _iterencode(self, o, markers=None):
284	if isinstance(o, basestring):
285	if self.ensure_ascii:
286	encoder = encode_basestring_ascii
287	else:
288	encoder = encode_basestring
289	_encoding = self.encoding
290	if (_encoding is not None and isinstance(o, str)
291	and not (_encoding == 'utf-8')):
292	o = o.decode(_encoding)
293	yield encoder(o)
294	elif o is None:
295	yield 'null'
296	elif o is True:
297	yield 'true'
298	elif o is False:
299	yield 'false'
300	elif isinstance(o, (int, long)):
301	yield str(o)
302	elif isinstance(o, float):
303	yield floatstr(o, self.allow_nan)
304	elif isinstance(o, (list, tuple)):
305	for chunk in self._iterencode_list(o, markers):
306	yield chunk
307	elif isinstance(o, dict):
308	for chunk in self._iterencode_dict(o, markers):
309	yield chunk
310	else:
311	if markers is not None:
312	markerid = id(o)
313	if markerid in markers:
314	raise ValueError("Circular reference detected")
315	markers[markerid] = o
316	for chunk in self._iterencode_default(o, markers):
317	yield chunk
318	if markers is not None:
319	del markers[markerid]
320
321	def _iterencode_default(self, o, markers=None):
322	newobj = self.default(o)
323	return self._iterencode(newobj, markers)
324
325	def default(self, o):
326	"""
327	Implement this method in a subclass such that it returns
328	a serializable object for ``o``, or calls the base implementation
329	(to raise a ``TypeError``).
330
331	For example, to support arbitrary iterators, you could
332	implement default like this::
333
334	def default(self, o):
335	try:
336	iterable = iter(o)
337	except TypeError:
338	pass
339	else:
340	return list(iterable)
341	return JSONEncoder.default(self, o)
342	"""
343	raise TypeError("%r is not JSON serializable" % (o,))
344
345	def encode(self, o):
346	"""
347	Return a JSON string representation of a Python data structure.
348
349	>>> JSONEncoder().encode({"foo": ["bar", "baz"]})
350	'{"foo": ["bar", "baz"]}'
351	"""
352	# This is for extremely simple cases and benchmarks.
353	if isinstance(o, basestring):
354	if isinstance(o, str):
355	_encoding = self.encoding
356	if (_encoding is not None
357	and not (_encoding == 'utf-8')):
358	o = o.decode(_encoding)
359	if self.ensure_ascii:
360	return encode_basestring_ascii(o)
361	else:
362	return encode_basestring(o)
363	# This doesn't pass the iterator directly to ''.join() because the
364	# exceptions aren't as detailed. The list call should be roughly
365	# equivalent to the PySequence_Fast that ''.join() would do.
366	chunks = list(self.iterencode(o))
367	return ''.join(chunks)
368
369	def iterencode(self, o):
370	"""
371	Encode the given object and yield each string
372	representation as available.
373
374	For example::
375
376	for chunk in JSONEncoder().iterencode(bigobject):
377	mysocket.write(chunk)
378	"""
379	if self.check_circular:
380	markers = {}
381	else:
382	markers = None
383	return self._iterencode(o, markers)
384
385	__all__ = ['JSONEncoder']