django1/django/forms/util.py

69 lines
2.5 KiB
Python

from django.utils.html import conditional_escape
from django.utils.encoding import smart_unicode, StrAndUnicode, force_unicode
from django.utils.safestring import mark_safe
def flatatt(attrs):
"""
Convert a dictionary of attributes to a single string.
The returned string will contain a leading space followed by key="value",
XML-style pairs. It is assumed that the keys do not need to be XML-escaped.
If the passed dictionary is empty, then return an empty string.
"""
return u''.join([u' %s="%s"' % (k, conditional_escape(v)) for k, v in attrs.items()])
class ErrorDict(dict, StrAndUnicode):
"""
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 __unicode__(self):
return self.as_ul()
def as_ul(self):
if not self: return u''
return mark_safe(u'<ul class="errorlist">%s</ul>'
% ''.join([u'<li>%s%s</li>' % (k, force_unicode(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' % force_unicode(i) for i in v])) for k, v in self.items()])
class ErrorList(list, StrAndUnicode):
"""
A collection of errors that knows how to display itself in various formats.
"""
def __unicode__(self):
return self.as_ul()
def as_ul(self):
if not self: return u''
return mark_safe(u'<ul class="errorlist">%s</ul>'
% ''.join([u'<li>%s</li>' % conditional_escape(force_unicode(e)) for e in self]))
def as_text(self):
if not self: return u''
return u'\n'.join([u'* %s' % force_unicode(e) for e in self])
def __repr__(self):
return repr([force_unicode(e) for e in self])
class ValidationError(Exception):
def __init__(self, message):
"""
ValidationError can be passed any object that can be printed (usually
a string) or a list of objects.
"""
if isinstance(message, list):
self.messages = ErrorList([smart_unicode(msg) for msg in message])
else:
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)