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File Content: `utils.py`

import json
from collections import UserList

from django.conf import settings
from django.core.exceptions import ValidationError
from django.utils import timezone
from django.utils.html import escape, format_html, format_html_join, html_safe
from django.utils.translation import gettext_lazy as _


def pretty_name(name):
    """Convert 'first_name' to 'First name'."""
    if not name:
        return ''
    return name.replace('_', ' ').capitalize()


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. In the case of a boolean value, the key will appear
    without a value. 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' (by way of 'format_html_join').
    """
    key_value_attrs = []
    boolean_attrs = []
    for attr, value in attrs.items():
        if isinstance(value, bool):
            if value:
                boolean_attrs.append((attr,))
        elif value is not None:
            key_value_attrs.append((attr, value))

    return (
        format_html_join('', ' {}="{}"', sorted(key_value_attrs)) +
        format_html_join('', ' {}', sorted(boolean_attrs))
    )


@html_safe
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 get_json_data(self, escape_html=False):
        return {f: e.get_json_data(escape_html) for f, e in self.items()}

    def as_json(self, escape_html=False):
        return json.dumps(self.get_json_data(escape_html))

    def as_ul(self):
        if not self:
            return ''
        return format_html(
            '<ul class="errorlist">{}</ul>',
            format_html_join('', '<li>{}{}</li>', 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()


@html_safe
class ErrorList(UserList, list):
    """
    A collection of errors that knows how to display itself in various formats.
    """
    def __init__(self, initlist=None, error_class=None):
        super().__init__(initlist)

        if error_class is None:
            self.error_class = 'errorlist'
        else:
            self.error_class = 'errorlist {}'.format(error_class)

    def as_data(self):
        return ValidationError(self.data).error_list

    def copy(self):
        copy = super().copy()
        copy.error_class = self.error_class
        return copy

    def get_json_data(self, escape_html=False):
        errors = []
        for error in self.as_data():
            message = next(iter(error))
            errors.append({
                'message': escape(message) if escape_html else message,
                'code': error.code or '',
            })
        return errors

    def as_json(self, escape_html=False):
        return json.dumps(self.get_json_data(escape_html))

    def as_ul(self):
        if not self.data:
            return ''

        return format_html(
            '<ul class="{}">{}</ul>',
            self.error_class,
            format_html_join('', '<li>{}</li>', ((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 __getitem__(self, i):
        error = self.data[i]
        if isinstance(error, ValidationError):
            return next(iter(error))
        return error

    def __reduce_ex__(self, *args, **kwargs):
        # The `list` reduce function returns an iterator as the fourth element
        # that is normally used for repopulating. Since we only inherit from
        # `list` for `isinstance` backward compatibility (Refs #17413) we
        # nullify this iterator as it would otherwise result in duplicate
        # entries. (Refs #23594)
        info = super(UserList, self).__reduce_ex__(*args, **kwargs)
        return info[:3] + (None, None)


# 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:
            if (
                not timezone._is_pytz_zone(current_timezone) and
                timezone._datetime_ambiguous_or_imaginary(value, current_timezone)
            ):
                raise ValueError('Ambiguous or non-existent time.')
            return timezone.make_aware(value, current_timezone)
        except Exception as exc:
            raise ValidationError(
                _('%(datetime)s couldn’t be interpreted '
                  'in time zone %(current_timezone)s; it '
                  'may be ambiguous or it may not exist.'),
                code='ambiguous_timezone',
                params={'datetime': value, 'current_timezone': current_timezone}
            ) from exc
    return value


def to_current_timezone(value):
    """
    When time zone support is enabled, convert aware datetimes
    to naive datetimes in the current time zone for display.
    """
    if settings.USE_TZ and value is not None and timezone.is_aware(value):
        return timezone.make_naive(value)
    return value
Name	Size	Permission
__pycache__	---	0755
jinja2	---	0755
templates	---	0755
__init__.py	368 bytes	0644
boundfield.py	10246 bytes	0644
fields.py	47327 bytes	0644
forms.py	19804 bytes	0644
formsets.py	19864 bytes	0644
models.py	58083 bytes	0644
renderers.py	1917 bytes	0644
utils.py	5996 bytes	0644
widgets.py	38330 bytes	0644
File Content: utils.py

File Content: `utils.py`
