<commit_before>"""
Form classes
"""

from __future__ import unicode_literals

import copy
from collections import OrderedDict

from django.core.exceptions import NON_FIELD_ERRORS, ValidationError
from django.forms.fields import Field, FileField
# pretty_name is imported for backwards compatibility in Django 1.9
from django.forms.utils import ErrorDict, ErrorList, pretty_name  # NOQA
from django.forms.widgets import Media, MediaDefiningClass
from django.utils import six
from django.utils.encoding import force_text, python_2_unicode_compatible
from django.utils.functional import cached_property
from django.utils.html import conditional_escape, html_safe
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext as _

__all__ = ('BaseForm', 'Form')


class DeclarativeFieldsMetaclass(MediaDefiningClass):
    """
    Metaclass that collects Fields declared on the base classes.
    """
    def __new__(mcs, name, bases, attrs):
        # Collect fields from current class.
        current_fields = []
        for key, value in list(attrs.items()):
            if isinstance(value, Field):
                current_fields.append((key, value))
                attrs.pop(key)
        current_fields.sort(key=lambda x: x[1].creation_counter)
        attrs['declared_fields'] = OrderedDict(current_fields)<commit_msg>Refs #25294 -- Added BoundField import for backwards compatibility.<commit_after>"""
Form classes
"""

from __future__ import unicode_literals

import copy
from collections import OrderedDict

from django.core.exceptions import NON_FIELD_ERRORS, ValidationError
# BoundField is imported for backwards compatibility in Django 1.9
from django.forms.boundfield import BoundField  # NOQA
from django.forms.fields import Field, FileField
# pretty_name is imported for backwards compatibility in Django 1.9
from django.forms.utils import ErrorDict, ErrorList, pretty_name  # NOQA
from django.forms.widgets import Media, MediaDefiningClass
from django.utils import six
from django.utils.encoding import force_text, python_2_unicode_compatible
from django.utils.functional import cached_property
from django.utils.html import conditional_escape, html_safe
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext as _

__all__ = ('BaseForm', 'Form')


class DeclarativeFieldsMetaclass(MediaDefiningClass):
    """
    Metaclass that collects Fields declared on the base classes.
    """
    def __new__(mcs, name, bases, attrs):
        # Collect fields from current class.
        current_fields = []
        for key, value in list(attrs.items()):
            if isinstance(value, Field):
                current_fields.append((key, value))
                attrs.pop(key)
        current_fields.sort(key=lambda x: x[1].creation_counter)
        attrs['declared_fields'] = OrderedDict(current_fields)
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