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from django.conf import settings
from django.utils.html import escape
# Converts a dictionary to a single string with key="value", XML-style with
# a leading space. Assumes keys do not need to be XML-escaped.
flatatt = lambda attrs: u''.join([u' %s="%s"' % (k, escape(v)) for k, v in attrs.items()])
def smart_unicode(s):
if not isinstance(s, basestring):
s = unicode(str(s))
elif not isinstance(s, unicode):
s = unicode(s, settings.DEFAULT_CHARSET)
return s
class StrAndUnicode(object):
"""
A class whose __str__ returns its __unicode__ as a bytestring
according to settings.DEFAULT_CHARSET.
Useful as a mix-in.
"""
def __str__(self):
return self.__unicode__().encode(settings.DEFAULT_CHARSET)
class ErrorDict(dict):
"""
A collection of errors that knows how to display itself in various formats.
The dictionary keys are the field names, and the values are the errors.
"""
def __str__(self):
return self.as_ul()
def as_ul(self):
if not self: return u''
return u'<ul class="errorlist">%s</ul>' % ''.join([u'<li>%s%s</li>' % (k, v) for k, v in self.items()])
def as_text(self):
return u'\n'.join([u'* %s\n%s' % (k, u'\n'.join([u' * %s' % i for i in v])) for k, v in self.items()])
class ErrorList(list):
"""
A collection of errors that knows how to display itself in various formats.
"""
def __str__(self):
return self.as_ul()
def as_ul(self):
if not self: return u''
return u'<ul class="errorlist">%s</ul>' % ''.join([u'<li>%s</li>' % e for e in self])
def as_text(self):
if not self: return u''
return u'\n'.join([u'* %s' % e for e in self])
class ValidationError(Exception):
def __init__(self, message):
"ValidationError can be passed a string or a list."
if isinstance(message, list):
self.messages = ErrorList([smart_unicode(msg) for msg in message])
else:
assert isinstance(message, basestring), ("%s should be a basestring" % repr(message))
message = smart_unicode(message)
self.messages = ErrorList([message])
def __str__(self):
# This is needed because, without a __str__(), printing an exception
# instance would result in this:
# AttributeError: ValidationError instance has no attribute 'args'
# See http://www.python.org/doc/current/tut/node10.html#handling
return repr(self.messages)
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