sqlalchemy: Merged revisions 3918 to 4053 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/sqlalchemy@4054 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 55 insertions, 0 deletions

diff --git a/django/newforms/util.py b/django/newforms/util.py
new file mode 100644
index 0000000000..3887010c85
--- /dev/null
+++ b/django/newforms/util.py
@@ -0,0 +1,55 @@
+# Default encoding for input byte strings.
+DEFAULT_ENCODING = 'utf-8' # TODO: First look at django.conf.settings, then fall back to this.
+
+def smart_unicode(s):
+    if not isinstance(s, unicode):
+        s = unicode(s, DEFAULT_ENCODING)
+    return s
+
+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)