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import re, json, sys
if sys.version_info[0] == 2:
def _is_num(o):
return isinstance(o, int) or isinstance(o, long) or isinstance(o, float)
def _stringify(o):
if isinstance(o, str):
return unicode(o)
if isinstance(o, unicode):
return o
return None
else:
def _is_num(o):
return isinstance(o, int) or isinstance(o, float)
def _stringify(o):
if isinstance(o, bytes):
return o.decode()
if isinstance(o, str):
return o
return None
_id_re = re.compile(r'[$a-zA-Z_][$0-9a-zA-Z_]*\Z')
class CSONEncoder:
def __init__(self, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, sort_keys=False,
indent=None, default=None):
self._skipkeys = skipkeys
self._ensure_ascii = ensure_ascii
self._allow_nan = allow_nan
self._sort_keys = sort_keys
self._indent = ' ' * (indent or 4)
self._default = default
if check_circular:
self._obj_stack = set()
else:
self._obj_stack = None
def _format_simple_val(self, o):
if o is None:
return 'null'
if isinstance(o, bool):
return 'true' if o else 'false'
if _is_num(o):
return str(o)
s = _stringify(o)
if s is not None:
return self._escape_string(s)
return None
def _escape_string(self, s):
r = json.dumps(s, ensure_ascii=self._ensure_ascii)
return u"'{}'".format(r[1:-1].replace("'", r"\'"))
def _escape_key(self, s):
if s is None or isinstance(s, bool) or _is_num(s):
s = str(s)
s = _stringify(s)
if s is None:
if self._skipkeys:
return None
raise TypeError('keys must be a string')
if not _id_re.match(s):
return self._escape_string(s)
return s
def _push_obj(self, o):
if self._obj_stack is not None:
if id(o) in self._obj_stack:
raise ValueError('Circular reference detected')
self._obj_stack.add(id(o))
def _pop_obj(self, o):
if self._obj_stack is not None:
self._obj_stack.remove(id(o))
def _encode(self, o, obj_val=False, indent='', force_flow=False):
if isinstance(o, list):
if not o:
if obj_val:
yield ' []\n'
else:
yield indent
yield '[]\n'
else:
if obj_val:
yield ' [\n'
else:
yield indent
yield '[\n'
indent = indent + self._indent
self._push_obj(o)
for v in o:
for chunk in self._encode(v, obj_val=False, indent=indent, force_flow=True):
yield chunk
self._pop_obj(o)
yield indent[:-len(self._indent)]
yield ']\n'
elif isinstance(o, dict):
items = [(self._escape_key(k), v) for k, v in o.items()]
if self._skipkeys:
items = [(k, v) for k, v in items if k is not None]
if self._sort_keys:
items.sort()
if force_flow or not items:
if not items:
if obj_val:
yield ' {}\n'
else:
yield indent
yield '{}\n'
else:
if obj_val:
yield ' {\n'
else:
yield indent
yield '{\n'
indent = indent + self._indent
self._push_obj(o)
for k, v in items:
yield indent
yield k
yield ':'
for chunk in self._encode(v, obj_val=True, indent=indent + self._indent, force_flow=False):
yield chunk
self._pop_obj(o)
yield indent[:-len(self._indent)]
yield '}\n'
else:
if obj_val:
yield '\n'
self._push_obj(o)
for k, v in items:
yield indent
yield k
yield ':'
for chunk in self._encode(v, obj_val=True, indent=indent + self._indent, force_flow=False):
yield chunk
self._pop_obj(o)
else:
v = self._format_simple_val(o)
if v is None:
self._push_obj(o)
v = self.default(o)
for chunk in self._encode(v, obj_val=obj_val, indent=indent, force_flow=force_flow):
yield chunk
self._pop_obj(o)
else:
if obj_val:
yield ' '
else:
yield indent
yield v
yield '\n'
def iterencode(self, o):
return self._encode(o)
def encode(self, o):
return ''.join(self.iterencode(o))
def default(self, o):
if self._default is None:
raise TypeError('Cannot serialize an object of type {}'.format(type(o).__name__))
return self._default(o)
def dump(obj, fp, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None,
indent=None, default=None, sort_keys=False, **kw):
if indent is None and cls is None:
return json.dump(obj, fp, skipkeys=skipkeys, ensure_ascii=ensure_ascii, check_circular=check_circular,
allow_nan=allow_nan, default=default, sort_keys=sort_keys, separators=(',', ':'))
if cls is None:
cls = CSONEncoder
encoder = cls(skipkeys=skipkeys, ensure_ascii=ensure_ascii, check_circular=check_circular,
allow_nan=allow_nan, sort_keys=sort_keys, indent=indent, default=default, **kw)
for chunk in encoder.iterencode(obj):
fp.write(chunk)
def dumps(obj, skipkeys=False, ensure_ascii=True, check_circular=True, allow_nan=True, cls=None, indent=None,
default=None, sort_keys=False, **kw):
if indent is None and cls is None:
return json.dumps(obj, skipkeys=skipkeys, ensure_ascii=ensure_ascii, check_circular=check_circular,
allow_nan=allow_nan, default=default, sort_keys=sort_keys, separators=(',', ':'))
if cls is None:
cls = CSONEncoder
encoder = cls(skipkeys=skipkeys, ensure_ascii=ensure_ascii, check_circular=check_circular,
allow_nan=allow_nan, sort_keys=sort_keys, indent=indent, default=default, **kw)
return encoder.encode(obj)
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