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"""
The `compat` module provides support for backwards compatibility with older
versions of Django/Python, and compatibility wrappers around optional packages.
"""
from __future__ import unicode_literals
from django.conf import settings
from django.core import validators
from django.utils import six
from django.views.generic import View
try:
# Python 3
from collections.abc import Mapping # noqa
except ImportError:
# Python 2.7
from collections import Mapping # noqa
try:
from django.urls import ( # noqa
URLPattern,
URLResolver,
)
except ImportError:
# Will be removed in Django 2.0
from django.urls import ( # noqa
RegexURLPattern as URLPattern,
RegexURLResolver as URLResolver,
)
try:
from django.core.validators import ProhibitNullCharactersValidator # noqa
except ImportError:
ProhibitNullCharactersValidator = None
def get_original_route(urlpattern):
"""
Get the original route/regex that was typed in by the user into the path(), re_path() or url() directive. This
is in contrast with get_regex_pattern below, which for RoutePattern returns the raw regex generated from the path().
"""
if hasattr(urlpattern, 'pattern'):
# Django 2.0
return str(urlpattern.pattern)
else:
# Django < 2.0
return urlpattern.regex.pattern
def get_regex_pattern(urlpattern):
"""
Get the raw regex out of the urlpattern's RegexPattern or RoutePattern. This is always a regular expression,
unlike get_original_route above.
"""
if hasattr(urlpattern, 'pattern'):
# Django 2.0
return urlpattern.pattern.regex.pattern
else:
# Django < 2.0
return urlpattern.regex.pattern
def is_route_pattern(urlpattern):
if hasattr(urlpattern, 'pattern'):
# Django 2.0
from django.urls.resolvers import RoutePattern
return isinstance(urlpattern.pattern, RoutePattern)
else:
# Django < 2.0
return False
def make_url_resolver(regex, urlpatterns):
try:
# Django 2.0
from django.urls.resolvers import RegexPattern
return URLResolver(RegexPattern(regex), urlpatterns)
except ImportError:
# Django < 2.0
return URLResolver(regex, urlpatterns)
def unicode_repr(instance):
# Get the repr of an instance, but ensure it is a unicode string
# on both python 3 (already the case) and 2 (not the case).
if six.PY2:
return repr(instance).decode('utf-8')
return repr(instance)
def unicode_to_repr(value):
# Coerce a unicode string to the correct repr return type, depending on
# the Python version. We wrap all our `__repr__` implementations with
# this and then use unicode throughout internally.
if six.PY2:
return value.encode('utf-8')
return value
def unicode_http_header(value):
# Coerce HTTP header value to unicode.
if isinstance(value, bytes):
return value.decode('iso-8859-1')
return value
def distinct(queryset, base):
if settings.DATABASES[queryset.db]["ENGINE"] == "django.db.backends.oracle":
# distinct analogue for Oracle users
return base.filter(pk__in=set(queryset.values_list('pk', flat=True)))
return queryset.distinct()
# django.contrib.postgres requires psycopg2
try:
from django.contrib.postgres import fields as postgres_fields
except ImportError:
postgres_fields = None
# coreapi is optional (Note that uritemplate is a dependency of coreapi)
try:
import coreapi
import uritemplate
except ImportError:
coreapi = None
uritemplate = None
# coreschema is optional
try:
import coreschema
except ImportError:
coreschema = None
# pyyaml is optional
try:
import yaml
except ImportError:
yaml = None
# django-crispy-forms is optional
try:
import crispy_forms
except ImportError:
crispy_forms = None
# requests is optional
try:
import requests
except ImportError:
requests = None
def is_guardian_installed():
"""
django-guardian is optional and only imported if in INSTALLED_APPS.
"""
return 'guardian' in settings.INSTALLED_APPS
# PATCH method is not implemented by Django
if 'patch' not in View.http_method_names:
View.http_method_names = View.http_method_names + ['patch']
# Markdown is optional
try:
import markdown
if markdown.version <= '2.2':
HEADERID_EXT_PATH = 'headerid'
LEVEL_PARAM = 'level'
elif markdown.version < '2.6':
HEADERID_EXT_PATH = 'markdown.extensions.headerid'
LEVEL_PARAM = 'level'
else:
HEADERID_EXT_PATH = 'markdown.extensions.toc'
LEVEL_PARAM = 'baselevel'
def apply_markdown(text):
"""
Simple wrapper around :func:`markdown.markdown` to set the base level
of '#' style headers to <h2>.
"""
extensions = [HEADERID_EXT_PATH]
extension_configs = {
HEADERID_EXT_PATH: {
LEVEL_PARAM: '2'
}
}
md = markdown.Markdown(
extensions=extensions, extension_configs=extension_configs
)
md_filter_add_syntax_highlight(md)
return md.convert(text)
except ImportError:
apply_markdown = None
markdown = None
try:
import pygments
from pygments.lexers import get_lexer_by_name, TextLexer
from pygments.formatters import HtmlFormatter
def pygments_highlight(text, lang, style):
lexer = get_lexer_by_name(lang, stripall=False)
formatter = HtmlFormatter(nowrap=True, style=style)
return pygments.highlight(text, lexer, formatter)
def pygments_css(style):
formatter = HtmlFormatter(style=style)
return formatter.get_style_defs('.highlight')
except ImportError:
pygments = None
def pygments_highlight(text, lang, style):
return text
def pygments_css(style):
return None
if markdown is not None and pygments is not None:
# starting from this blogpost and modified to support current markdown extensions API
# https://zerokspot.com/weblog/2008/06/18/syntax-highlighting-in-markdown-with-pygments/
from markdown.preprocessors import Preprocessor
import re
class CodeBlockPreprocessor(Preprocessor):
pattern = re.compile(
r'^\s*``` *([^\n]+)\n(.+?)^\s*```', re.M | re.S)
formatter = HtmlFormatter()
def run(self, lines):
def repl(m):
try:
lexer = get_lexer_by_name(m.group(1))
except (ValueError, NameError):
lexer = TextLexer()
code = m.group(2).replace('\t', ' ')
code = pygments.highlight(code, lexer, self.formatter)
code = code.replace('\n\n', '\n&nbsp;\n').replace('\n', '<br />').replace('\\@', '@')
return '\n\n%s\n\n' % code
ret = self.pattern.sub(repl, "\n".join(lines))
return ret.split("\n")
def md_filter_add_syntax_highlight(md):
md.preprocessors.add('highlight', CodeBlockPreprocessor(), "_begin")
return True
else:
def md_filter_add_syntax_highlight(md):
return False
# Django 1.x url routing syntax. Remove when dropping Django 1.11 support.
try:
from django.urls import include, path, re_path, register_converter # noqa
except ImportError:
from django.conf.urls import include, url # noqa
path = None
register_converter = None
re_path = url
# `separators` argument to `json.dumps()` differs between 2.x and 3.x
# See: https://bugs.python.org/issue22767
if six.PY3:
SHORT_SEPARATORS = (',', ':')
LONG_SEPARATORS = (', ', ': ')
INDENT_SEPARATORS = (',', ': ')
else:
SHORT_SEPARATORS = (b',', b':')
LONG_SEPARATORS = (b', ', b': ')
INDENT_SEPARATORS = (b',', b': ')
class CustomValidatorMessage(object):
"""
We need to avoid evaluation of `lazy` translated `message` in `django.core.validators.BaseValidator.__init__`.
https://github.com/django/django/blob/75ed5900321d170debef4ac452b8b3cf8a1c2384/django/core/validators.py#L297
Ref: https://github.com/encode/django-rest-framework/pull/5452
"""
def __init__(self, *args, **kwargs):
self.message = kwargs.pop('message', self.message)
super(CustomValidatorMessage, self).__init__(*args, **kwargs)
class MinValueValidator(CustomValidatorMessage, validators.MinValueValidator):
pass
class MaxValueValidator(CustomValidatorMessage, validators.MaxValueValidator):
pass
class MinLengthValidator(CustomValidatorMessage, validators.MinLengthValidator):
pass
class MaxLengthValidator(CustomValidatorMessage, validators.MaxLengthValidator):
pass