app/django/forms/util.py
author Sverre Rabbelier <srabbelier@gmail.com>
Thu, 16 Oct 2008 23:23:16 +0000
changeset 363 d35ffa6ca643
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Add a framework for generic views This commit does not enable the new code, as such there should be no change in functionality. In order to use the new code the maps.py file should be updated to point at the new views/models/sponsor.py module. Patch by: Sverre Rabbelier Reviewed by: to-be-reviewed

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>' % 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)