add an extract of simplejson for JSON rendering only
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2817 fd906abe-77d9-0310-91a1-e0d9ade77398
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helmutm
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295
util/json.py
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295
util/json.py
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r"""
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A simple, fast, extensible JSON encoder
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JSON (JavaScript Object Notation) <http://json.org> is a subset of
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JavaScript syntax (ECMA-262 3rd edition) used as a lightweight data
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interchange format."""
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import re
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ESCAPE = re.compile(r'[\x00-\x1f\\"\b\f\n\r\t]')
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ESCAPE_ASCII = re.compile(r'([\\"]|[^\ -~])')
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HAS_UTF8 = re.compile(r'[\x80-\xff]')
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ESCAPE_DCT = {
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'\\': '\\\\',
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'"': '\\"',
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'\b': '\\b',
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'\f': '\\f',
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'\n': '\\n',
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'\r': '\\r',
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'\t': '\\t',
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}
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for i in range(0x20):
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ESCAPE_DCT.setdefault(chr(i), '\\u%04x' % (i,))
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# Assume this produces an infinity on all machines (probably not guaranteed)
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INFINITY = float('1e66666')
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FLOAT_REPR = repr
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def floatstr(o, allow_nan=True):
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if o != o:
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text = 'NaN'
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elif o == INFINITY:
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text = 'Infinity'
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elif o == -INFINITY:
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text = '-Infinity'
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else:
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return FLOAT_REPR(o)
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if not allow_nan:
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raise ValueError("Out of range float values are not JSON compliant: %r"
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% (o,))
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return text
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def encode_basestring(s):
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def replace(match):
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return ESCAPE_DCT[match.group(0)]
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return '"' + ESCAPE.sub(replace, s) + '"'
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def py_encode_basestring_ascii(s):
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if isinstance(s, str) and HAS_UTF8.search(s) is not None:
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s = s.decode('utf-8')
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def replace(match):
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s = match.group(0)
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try:
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return ESCAPE_DCT[s]
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except KeyError:
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n = ord(s)
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if n < 0x10000:
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return '\\u%04x' % (n,)
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else:
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# surrogate pair
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n -= 0x10000
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s1 = 0xd800 | ((n >> 10) & 0x3ff)
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s2 = 0xdc00 | (n & 0x3ff)
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return '\\u%04x\\u%04x' % (s1, s2)
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return '"' + str(ESCAPE_ASCII.sub(replace, s)) + '"'
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encode_basestring_ascii = py_encode_basestring_ascii
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class JSONEncoder(object):
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item_separator = ', '
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key_separator = ': '
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def __init__(self, skipkeys=False, ensure_ascii=True,
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check_circular=True, allow_nan=True, sort_keys=False,
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indent=None, separators=None, encoding='utf-8', default=None):
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self.skipkeys = skipkeys
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self.ensure_ascii = ensure_ascii
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self.check_circular = check_circular
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self.allow_nan = allow_nan
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self.sort_keys = sort_keys
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self.indent = indent
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self.current_indent_level = 0
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if separators is not None:
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self.item_separator, self.key_separator = separators
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if default is not None:
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self.default = default
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self.encoding = encoding
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def _newline_indent(self):
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return '\n' + (' ' * (self.indent * self.current_indent_level))
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def _iterencode_list(self, lst, markers=None):
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if not lst:
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yield '[]'
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return
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if markers is not None:
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markerid = id(lst)
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if markerid in markers:
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raise ValueError("Circular reference detected")
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markers[markerid] = lst
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yield '['
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if self.indent is not None:
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self.current_indent_level += 1
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newline_indent = self._newline_indent()
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separator = self.item_separator + newline_indent
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yield newline_indent
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else:
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newline_indent = None
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separator = self.item_separator
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first = True
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for value in lst:
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if first:
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first = False
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else:
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yield separator
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for chunk in self._iterencode(value, markers):
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yield chunk
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if newline_indent is not None:
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self.current_indent_level -= 1
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yield self._newline_indent()
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yield ']'
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if markers is not None:
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del markers[markerid]
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def _iterencode_dict(self, dct, markers=None):
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if not dct:
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yield '{}'
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return
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if markers is not None:
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markerid = id(dct)
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if markerid in markers:
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raise ValueError("Circular reference detected")
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markers[markerid] = dct
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yield '{'
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key_separator = self.key_separator
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if self.indent is not None:
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self.current_indent_level += 1
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newline_indent = self._newline_indent()
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item_separator = self.item_separator + newline_indent
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yield newline_indent
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else:
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newline_indent = None
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item_separator = self.item_separator
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first = True
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if self.ensure_ascii:
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encoder = encode_basestring_ascii
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else:
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encoder = encode_basestring
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allow_nan = self.allow_nan
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if self.sort_keys:
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keys = dct.keys()
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keys.sort()
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items = [(k, dct[k]) for k in keys]
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else:
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items = dct.iteritems()
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_encoding = self.encoding
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_do_decode = (_encoding is not None
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and not (_encoding == 'utf-8'))
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for key, value in items:
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if isinstance(key, str):
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if _do_decode:
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key = key.decode(_encoding)
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elif isinstance(key, basestring):
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pass
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# JavaScript is weakly typed for these, so it makes sense to
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# also allow them. Many encoders seem to do something like this.
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elif isinstance(key, float):
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key = floatstr(key, allow_nan)
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elif isinstance(key, (int, long)):
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key = str(key)
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elif key is True:
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key = 'true'
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elif key is False:
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key = 'false'
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elif key is None:
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key = 'null'
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elif self.skipkeys:
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continue
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else:
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raise TypeError("key %r is not a string" % (key,))
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if first:
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first = False
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else:
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yield item_separator
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yield encoder(key)
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yield key_separator
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for chunk in self._iterencode(value, markers):
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yield chunk
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if newline_indent is not None:
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self.current_indent_level -= 1
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yield self._newline_indent()
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yield '}'
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if markers is not None:
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del markers[markerid]
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def _iterencode(self, o, markers=None):
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if isinstance(o, basestring):
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if self.ensure_ascii:
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encoder = encode_basestring_ascii
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else:
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encoder = encode_basestring
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_encoding = self.encoding
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if (_encoding is not None and isinstance(o, str)
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and not (_encoding == 'utf-8')):
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o = o.decode(_encoding)
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yield encoder(o)
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elif o is None:
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yield 'null'
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elif o is True:
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yield 'true'
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elif o is False:
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yield 'false'
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elif isinstance(o, (int, long)):
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yield str(o)
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elif isinstance(o, float):
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yield floatstr(o, self.allow_nan)
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elif isinstance(o, (list, tuple)):
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for chunk in self._iterencode_list(o, markers):
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yield chunk
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elif isinstance(o, dict):
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for chunk in self._iterencode_dict(o, markers):
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yield chunk
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else:
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if markers is not None:
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markerid = id(o)
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if markerid in markers:
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raise ValueError("Circular reference detected")
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markers[markerid] = o
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for chunk in self._iterencode_default(o, markers):
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yield chunk
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if markers is not None:
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del markers[markerid]
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def _iterencode_default(self, o, markers=None):
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newobj = self.default(o)
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return self._iterencode(newobj, markers)
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def default(self, o):
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raise TypeError("%r is not JSON serializable" % (o,))
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def encode(self, o):
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if isinstance(o, basestring):
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if isinstance(o, str):
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_encoding = self.encoding
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if (_encoding is not None
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and not (_encoding == 'utf-8')):
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o = o.decode(_encoding)
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if self.ensure_ascii:
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return encode_basestring_ascii(o)
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else:
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return encode_basestring(o)
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chunks = list(self.iterencode(o))
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return ''.join(chunks)
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def iterencode(self, o):
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if self.check_circular:
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markers = {}
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else:
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markers = None
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return self._iterencode(o, markers)
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_default_encoder = JSONEncoder(
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skipkeys=False,
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ensure_ascii=True,
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check_circular=True,
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allow_nan=True,
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indent=None,
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separators=None,
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encoding='utf-8',
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default=None,
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)
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def dumps(obj, skipkeys=False, ensure_ascii=True, check_circular=True,
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allow_nan=True, cls=None, indent=None, separators=None,
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encoding='utf-8', default=None, **kw):
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if (skipkeys is False and ensure_ascii is True and
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check_circular is True and allow_nan is True and
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cls is None and indent is None and separators is None and
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encoding == 'utf-8' and default is None and not kw):
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return _default_encoder.encode(obj)
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if cls is None:
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cls = JSONEncoder
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return cls(
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skipkeys=skipkeys, ensure_ascii=ensure_ascii,
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check_circular=check_circular, allow_nan=allow_nan, indent=indent,
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separators=separators, encoding=encoding, default=default,
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**kw).encode(obj)
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