app/django/forms/util.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 12 Sep 2009 21:27:17 +0200
changeset 2910 60d56cf01b54
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Use the new optional argument to endRequest in the middleware Currently endRequest is called twice on an exception if Django intercepts the exception and returns it's own result. By setting optional=True we do not crash on 'assert self.in_request'.

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)