class FormsDict MultiDict This class MultiDict subclass is used to sto

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class FormsDict(MultiDict):
''' This :class:`MultiDict` subclass is used to store request form data.
Additionally to the normal dict-like item access methods (which return
unmodified data as native strings), this container also supports
attribute-like access to its values. Attributes are automatically de-
or recoded to match :attr:`input_encoding` (default: 'utf8'). Missing
attributes default to an empty string. '''
#: Encoding used for attribute values.
input_encoding = 'utf8'
#: If true (default), unicode strings are first encoded with `latin1`
#: and then decoded to match :attr:`input_encoding`.
recode_unicode = True
def _fix(self, s, encoding=None):
if isinstance(s, unicode) and self.recode_unicode: # Python 3 WSGI
return s.encode('latin1').decode(encoding or self.input_encoding)
elif isinstance(s, bytes): # Python 2 WSGI
return s.decode(encoding or self.input_encoding)
else:
return s
def decode(self, encoding=None):
''' Returns a copy with all keys and values de- or recoded to match
:attr:`input_encoding`. Some libraries (e.g. WTForms) want a
unicode dictionary. '''
copy = FormsDict()
enc = copy.input_encoding = encoding or self.input_encoding
copy.recode_unicode = False
for key, value in self.allitems():
copy.append(self._fix(key, enc), self._fix(value, enc))
return copy
def getunicode(self, name, default=None, encoding=None):
''' Return the value as a unicode string, or the default. '''
try:
return self._fix(self[name], encoding)
except (UnicodeError, KeyError):
return default
def __getattr__(self, name, default=unicode()):
# Without this guard, pickle generates a cryptic TypeError:
if name.startswith('__') and name.endswith('__'):
return super(FormsDict, self).__getattr__(name)
return self.getunicode(name, default=default)