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Ambulance Clerc
214
venv/Lib/site-packages/django/forms/utils.py
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214
venv/Lib/site-packages/django/forms/utils.py
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import json
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from collections import UserList
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from django.conf import settings
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from django.core.exceptions import ValidationError
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from django.forms.renderers import get_default_renderer
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from django.utils import timezone
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from django.utils.html import escape, format_html_join
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from django.utils.safestring import mark_safe
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from django.utils.translation import gettext_lazy as _
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def pretty_name(name):
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"""Convert 'first_name' to 'First name'."""
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if not name:
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return ''
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return name.replace('_', ' ').capitalize()
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def flatatt(attrs):
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"""
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Convert a dictionary of attributes to a single string.
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The returned string will contain a leading space followed by key="value",
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XML-style pairs. In the case of a boolean value, the key will appear
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without a value. It is assumed that the keys do not need to be
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XML-escaped. If the passed dictionary is empty, then return an empty
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string.
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The result is passed through 'mark_safe' (by way of 'format_html_join').
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"""
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key_value_attrs = []
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boolean_attrs = []
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for attr, value in attrs.items():
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if isinstance(value, bool):
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if value:
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boolean_attrs.append((attr,))
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elif value is not None:
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key_value_attrs.append((attr, value))
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return (
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format_html_join('', ' {}="{}"', sorted(key_value_attrs)) +
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format_html_join('', ' {}', sorted(boolean_attrs))
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)
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class RenderableMixin:
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def get_context(self):
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raise NotImplementedError(
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'Subclasses of RenderableMixin must provide a get_context() method.'
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)
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def render(self, template_name=None, context=None, renderer=None):
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return mark_safe((renderer or self.renderer).render(
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template_name or self.template_name,
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context or self.get_context(),
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))
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__str__ = render
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__html__ = render
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class RenderableFormMixin(RenderableMixin):
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def as_p(self):
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"""Render as <p> elements."""
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return self.render(self.template_name_p)
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def as_table(self):
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"""Render as <tr> elements excluding the surrounding <table> tag."""
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return self.render(self.template_name_table)
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def as_ul(self):
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"""Render as <li> elements excluding the surrounding <ul> tag."""
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return self.render(self.template_name_ul)
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class RenderableErrorMixin(RenderableMixin):
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def as_json(self, escape_html=False):
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return json.dumps(self.get_json_data(escape_html))
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def as_text(self):
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return self.render(self.template_name_text)
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def as_ul(self):
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return self.render(self.template_name_ul)
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class ErrorDict(dict, RenderableErrorMixin):
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"""
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A collection of errors that knows how to display itself in various formats.
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The dictionary keys are the field names, and the values are the errors.
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"""
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template_name = 'django/forms/errors/dict/default.html'
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template_name_text = 'django/forms/errors/dict/text.txt'
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template_name_ul = 'django/forms/errors/dict/ul.html'
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def __init__(self, *args, renderer=None, **kwargs):
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super().__init__(*args, **kwargs)
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self.renderer = renderer or get_default_renderer()
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def as_data(self):
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return {f: e.as_data() for f, e in self.items()}
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def get_json_data(self, escape_html=False):
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return {f: e.get_json_data(escape_html) for f, e in self.items()}
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def get_context(self):
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return {
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'errors': self.items(),
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'error_class': 'errorlist',
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}
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class ErrorList(UserList, list, RenderableErrorMixin):
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"""
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A collection of errors that knows how to display itself in various formats.
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"""
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template_name = 'django/forms/errors/list/default.html'
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template_name_text = 'django/forms/errors/list/text.txt'
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template_name_ul = 'django/forms/errors/list/ul.html'
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def __init__(self, initlist=None, error_class=None, renderer=None):
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super().__init__(initlist)
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if error_class is None:
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self.error_class = 'errorlist'
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else:
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self.error_class = 'errorlist {}'.format(error_class)
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self.renderer = renderer or get_default_renderer()
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def as_data(self):
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return ValidationError(self.data).error_list
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def copy(self):
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copy = super().copy()
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copy.error_class = self.error_class
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return copy
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def get_json_data(self, escape_html=False):
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errors = []
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for error in self.as_data():
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message = next(iter(error))
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errors.append({
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'message': escape(message) if escape_html else message,
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'code': error.code or '',
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})
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return errors
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def get_context(self):
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return {
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'errors': self,
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'error_class': self.error_class,
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}
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def __repr__(self):
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return repr(list(self))
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def __contains__(self, item):
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return item in list(self)
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def __eq__(self, other):
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return list(self) == other
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def __getitem__(self, i):
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error = self.data[i]
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if isinstance(error, ValidationError):
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return next(iter(error))
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return error
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def __reduce_ex__(self, *args, **kwargs):
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# The `list` reduce function returns an iterator as the fourth element
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# that is normally used for repopulating. Since we only inherit from
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# `list` for `isinstance` backward compatibility (Refs #17413) we
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# nullify this iterator as it would otherwise result in duplicate
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# entries. (Refs #23594)
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info = super(UserList, self).__reduce_ex__(*args, **kwargs)
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return info[:3] + (None, None)
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# Utilities for time zone support in DateTimeField et al.
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def from_current_timezone(value):
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"""
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When time zone support is enabled, convert naive datetimes
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entered in the current time zone to aware datetimes.
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"""
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if settings.USE_TZ and value is not None and timezone.is_naive(value):
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current_timezone = timezone.get_current_timezone()
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try:
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if (
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not timezone._is_pytz_zone(current_timezone) and
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timezone._datetime_ambiguous_or_imaginary(value, current_timezone)
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):
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raise ValueError('Ambiguous or non-existent time.')
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return timezone.make_aware(value, current_timezone)
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except Exception as exc:
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raise ValidationError(
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_('%(datetime)s couldn’t be interpreted '
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'in time zone %(current_timezone)s; it '
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'may be ambiguous or it may not exist.'),
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code='ambiguous_timezone',
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params={'datetime': value, 'current_timezone': current_timezone}
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) from exc
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return value
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def to_current_timezone(value):
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"""
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When time zone support is enabled, convert aware datetimes
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to naive datetimes in the current time zone for display.
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"""
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if settings.USE_TZ and value is not None and timezone.is_aware(value):
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return timezone.make_naive(value)
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return value
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