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from __future__ import unicode_literals
import json
import sys
import warnings
from django.conf import settings
from django.utils.html import format_html, format_html_join
from django.utils.encoding import force_text, python_2_unicode_compatible
from django.utils import timezone
from django.utils.translation import ugettext_lazy as _
from django.utils import six
# Import ValidationError so that it can be imported from this
# module to maintain backwards compatibility.
from django.core.exceptions import ValidationError
try:
from collections import UserList
except ImportError: # Python 2
from UserList import UserList
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.
The result is passed through 'mark_safe'.
"""
for attr_name, value in attrs.items():
if type(value) is bool:
warnings.warn(
"In Django 1.8, widget attribute %(attr_name)s=%(bool_value)s "
"will %(action)s. To preserve current behavior, use the "
"string '%(bool_value)s' instead of the boolean value." % {
'attr_name': attr_name,
'action': "be rendered as '%s'" % attr_name if value else "not be rendered",
'bool_value': value,
},
DeprecationWarning
)
return format_html_join('', ' {0}="{1}"', sorted(attrs.items()))
@python_2_unicode_compatible
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 as_data(self):
return {f: e.as_data() for f, e in self.items()}
def as_json(self):
errors = {f: json.loads(e.as_json()) for f, e in self.items()}
return json.dumps(errors)
def as_ul(self):
if not self:
return ''
return format_html(
'<ul class="errorlist">{0}</ul>',
format_html_join('', '<li>{0}{1}</li>', ((k, force_text(v)) for k, v in self.items()))
)
def as_text(self):
output = []
for field, errors in self.items():
output.append('* %s' % field)
output.append('\n'.join(' * %s' % e for e in errors))
return '\n'.join(output)
def __str__(self):
return self.as_ul()
@python_2_unicode_compatible
class ErrorList(UserList, list):
"""
A collection of errors that knows how to display itself in various formats.
"""
def as_data(self):
return self.data
def as_json(self):
errors = []
for error in ValidationError(self.data).error_list:
errors.append({
'message': list(error)[0],
'code': error.code or '',
})
return json.dumps(errors)
def as_ul(self):
if not self.data:
return ''
return format_html(
'<ul class="errorlist">{0}</ul>',
format_html_join('', '<li>{0}</li>', ((force_text(e),) for e in self))
)
def as_text(self):
return '\n'.join('* %s' % e for e in self)
def __str__(self):
return self.as_ul()
def __repr__(self):
return repr(list(self))
def __contains__(self, item):
return item in list(self)
def __eq__(self, other):
return list(self) == other
def __ne__(self, other):
return list(self) != other
def __getitem__(self, i):
error = self.data[i]
if isinstance(error, ValidationError):
return list(error)[0]
return force_text(error)
# Utilities for time zone support in DateTimeField et al.
def from_current_timezone(value):
"""
When time zone support is enabled, convert naive datetimes
entered in the current time zone to aware datetimes.
"""
if settings.USE_TZ and value is not None and timezone.is_naive(value):
current_timezone = timezone.get_current_timezone()
try:
return timezone.make_aware(value, current_timezone)
except Exception:
message = _(
'%(datetime)s couldn\'t be interpreted '
'in time zone %(current_timezone)s; it '
'may be ambiguous or it may not exist.'
)
params = {'datetime': value, 'current_timezone': current_timezone}
six.reraise(ValidationError, ValidationError(
message,
code='ambiguous_timezone',
params=params,
), sys.exc_info()[2])
return value
def to_current_timezone(value):
"""
When time zone support is enabled, convert aware datetimes
to naive dateimes in the current time zone for display.
"""
if settings.USE_TZ and value is not None and timezone.is_aware(value):
current_timezone = timezone.get_current_timezone()
return timezone.make_naive(value, current_timezone)
return value
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