def resolve_url(to, *args, **kwargs):
"""
Return a URL appropriate for the arguments passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urlresolvers.reverse()` will
be used to reverse-resolve the name.
* A URL, which will be returned as-is.
"""
# If it's a model, use get_absolute_url()
if hasattr(to, 'get_absolute_url'):
return to.get_absolute_url()
if isinstance(to, Promise):
# Expand the lazy instance, as it can cause issues when it is passed
# further to some Python functions like urlparse.
to = force_text(to)
if isinstance(to, six.string_types):
# Handle relative URLs
if any(to.startswith(path) for path in ('./', '../')):
return to
# Next try a reverse URL resolution.
try:
return urlresolvers.reverse(to, args=args, kwargs=kwargs)
except urlresolvers.NoReverseMatch:
# If this is a callable, re-raise.
if callable(to):
raise
# If this doesn't "feel" like a URL, re-raise.
if '/' not in to and '.' not in to:
raise
# Finally, fall back and assume it's a URL
return to
python类Promise()的实例源码
def resolve_url(to, *args, **kwargs):
"""
Return a URL appropriate for the arguments passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urlresolvers.reverse()` will
be used to reverse-resolve the name.
* A URL, which will be returned as-is.
"""
# If it's a model, use get_absolute_url()
if hasattr(to, 'get_absolute_url'):
return to.get_absolute_url()
if isinstance(to, Promise):
# Expand the lazy instance, as it can cause issues when it is passed
# further to some Python functions like urlparse.
to = force_text(to)
if isinstance(to, six.string_types):
# Handle relative URLs
if any(to.startswith(path) for path in ('./', '../')):
return to
# Next try a reverse URL resolution.
try:
return urlresolvers.reverse(to, args=args, kwargs=kwargs)
except urlresolvers.NoReverseMatch:
# If this is a callable, re-raise.
if callable(to):
raise
# If this doesn't "feel" like a URL, re-raise.
if '/' not in to and '.' not in to:
raise
# Finally, fall back and assume it's a URL
return to
def is_non_str_iterable(obj):
# noinspection PyProtectedMember
if isinstance(obj, str) or (isinstance(obj, Promise) and obj._delegate_text):
return False
return hasattr(obj, '__iter__')
def default(self, o):
# See "Date Time String Format" in the ECMA-262 specification.
if isinstance(o, datetime.datetime):
r = o.isoformat()
if o.microsecond:
r = r[:23] + r[26:]
if r.endswith('+00:00'):
r = r[:-6] + 'Z'
return r
elif isinstance(o, datetime.date):
return o.isoformat()
elif isinstance(o, datetime.time):
if is_aware(o):
raise ValueError("JSON can't represent timezone-aware times.")
r = o.isoformat()
if o.microsecond:
r = r[:12]
return r
elif isinstance(o, decimal.Decimal):
return str(o)
elif isinstance(o, uuid.UUID):
return str(o)
elif isinstance(o, Promise):
return six.text_type(o)
else:
return super(DjangoJSONEncoder, self).default(o)
# Older, deprecated class name (for backwards compatibility purposes).
def default(self, o):
# See "Date Time String Format" in the ECMA-262 specification.
if isinstance(o, datetime.datetime):
r = o.isoformat()
if o.microsecond:
r = r[:23] + r[26:]
if r.endswith('+00:00'):
r = r[:-6] + 'Z'
return r
elif isinstance(o, datetime.date):
return o.isoformat()
elif isinstance(o, datetime.time):
if is_aware(o):
raise ValueError("JSON can't represent timezone-aware times.")
r = o.isoformat()
if o.microsecond:
r = r[:12]
return r
elif isinstance(o, datetime.timedelta):
return duration_iso_string(o)
elif isinstance(o, decimal.Decimal):
return str(o)
elif isinstance(o, uuid.UUID):
return str(o)
elif isinstance(o, Promise):
return six.text_type(o)
else:
return super(DjangoJSONEncoder, self).default(o)
def resolve_url(to, *args, **kwargs):
"""
Return a URL appropriate for the arguments passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urls.reverse()` will be used
to reverse-resolve the name.
* A URL, which will be returned as-is.
"""
# If it's a model, use get_absolute_url()
if hasattr(to, 'get_absolute_url'):
return to.get_absolute_url()
if isinstance(to, Promise):
# Expand the lazy instance, as it can cause issues when it is passed
# further to some Python functions like urlparse.
to = force_text(to)
if isinstance(to, six.string_types):
# Handle relative URLs
if to.startswith(('./', '../')):
return to
# Next try a reverse URL resolution.
try:
return reverse(to, args=args, kwargs=kwargs)
except NoReverseMatch:
# If this is a callable, re-raise.
if callable(to):
raise
# If this doesn't "feel" like a URL, re-raise.
if '/' not in to and '.' not in to:
raise
# Finally, fall back and assume it's a URL
return to
def get_prep_value(self, value):
"""
Perform preliminary non-db specific value checks and conversions.
"""
if isinstance(value, Promise):
value = value._proxy____cast()
return value
def smart_text(s, encoding='utf-8', strings_only=False, errors='strict'):
"""
Returns a text object representing 's' -- unicode on Python 2 and str on
Python 3. Treats bytestrings using the 'encoding' codec.
If strings_only is True, don't convert (some) non-string-like objects.
"""
if isinstance(s, Promise):
# The input is the result of a gettext_lazy() call.
return s
return force_text(s, encoding, strings_only, errors)
def smart_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
"""
Returns a bytestring version of 's', encoded as specified in 'encoding'.
If strings_only is True, don't convert (some) non-string-like objects.
"""
if isinstance(s, Promise):
# The input is the result of a gettext_lazy() call.
return s
return force_bytes(s, encoding, strings_only, errors)
def default(self, o):
# See "Date Time String Format" in the ECMA-262 specification.
if isinstance(o, datetime.datetime):
r = o.isoformat()
if o.microsecond:
r = r[:23] + r[26:]
if r.endswith('+00:00'):
r = r[:-6] + 'Z'
return r
elif isinstance(o, datetime.date):
return o.isoformat()
elif isinstance(o, datetime.time):
if is_aware(o):
raise ValueError("JSON can't represent timezone-aware times.")
r = o.isoformat()
if o.microsecond:
r = r[:12]
return r
elif isinstance(o, decimal.Decimal):
return str(o)
elif isinstance(o, uuid.UUID):
return str(o)
elif isinstance(o, Promise):
return six.text_type(o)
else:
return super(DjangoJSONEncoder, self).default(o)
# Older, deprecated class name (for backwards compatibility purposes).
def default(self, o):
# See "Date Time String Format" in the ECMA-262 specification.
if isinstance(o, datetime.datetime):
r = o.isoformat()
if o.microsecond:
r = r[:23] + r[26:]
if r.endswith('+00:00'):
r = r[:-6] + 'Z'
return r
elif isinstance(o, datetime.date):
return o.isoformat()
elif isinstance(o, datetime.time):
if is_aware(o):
raise ValueError("JSON can't represent timezone-aware times.")
r = o.isoformat()
if o.microsecond:
r = r[:12]
return r
elif isinstance(o, decimal.Decimal):
return str(o)
elif isinstance(o, uuid.UUID):
return str(o)
elif isinstance(o, Promise):
return six.text_type(o)
else:
return super(DjangoJSONEncoder, self).default(o)
# Older, deprecated class name (for backwards compatibility purposes).
def may_be_lazy(thing):
if isinstance(thing, Promise):
return thing._proxy____args[0]
else:
return thing
def default(self, o):
if isinstance(o, Promise):
return force_text(o)
return super(SafeJSONEncoder, self).default(o)
def default(self, o):
# See "Date Time String Format" in the ECMA-262 specification.
if isinstance(o, datetime.datetime):
r = o.isoformat()
if o.microsecond:
r = r[:23] + r[26:]
if r.endswith('+00:00'):
r = r[:-6] + 'Z'
return r
elif isinstance(o, datetime.date):
return o.isoformat()
elif isinstance(o, datetime.time):
if is_aware(o):
raise ValueError("JSON can't represent timezone-aware times.")
r = o.isoformat()
if o.microsecond:
r = r[:12]
return r
elif isinstance(o, datetime.timedelta):
return duration_iso_string(o)
elif isinstance(o, decimal.Decimal):
return str(o)
elif isinstance(o, uuid.UUID):
return str(o)
elif isinstance(o, Promise):
return six.text_type(o)
else:
return super(DjangoJSONEncoder, self).default(o)
def resolve_url(to, *args, **kwargs):
"""
Return a URL appropriate for the arguments passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urls.reverse()` will be used
to reverse-resolve the name.
* A URL, which will be returned as-is.
"""
# If it's a model, use get_absolute_url()
if hasattr(to, 'get_absolute_url'):
return to.get_absolute_url()
if isinstance(to, Promise):
# Expand the lazy instance, as it can cause issues when it is passed
# further to some Python functions like urlparse.
to = force_text(to)
if isinstance(to, six.string_types):
# Handle relative URLs
if to.startswith(('./', '../')):
return to
# Next try a reverse URL resolution.
try:
return reverse(to, args=args, kwargs=kwargs)
except NoReverseMatch:
# If this is a callable, re-raise.
if callable(to):
raise
# If this doesn't "feel" like a URL, re-raise.
if '/' not in to and '.' not in to:
raise
# Finally, fall back and assume it's a URL
return to
def get_prep_value(self, value):
"""
Perform preliminary non-db specific value checks and conversions.
"""
if isinstance(value, Promise):
value = value._proxy____cast()
return value
def smart_text(s, encoding='utf-8', strings_only=False, errors='strict'):
"""
Returns a text object representing 's' -- unicode on Python 2 and str on
Python 3. Treats bytestrings using the 'encoding' codec.
If strings_only is True, don't convert (some) non-string-like objects.
"""
if isinstance(s, Promise):
# The input is the result of a gettext_lazy() call.
return s
return force_text(s, encoding, strings_only, errors)
def smart_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
"""
Returns a bytestring version of 's', encoded as specified in 'encoding'.
If strings_only is True, don't convert (some) non-string-like objects.
"""
if isinstance(s, Promise):
# The input is the result of a gettext_lazy() call.
return s
return force_bytes(s, encoding, strings_only, errors)
def resolve_url(to, *args, **kwargs):
"""
Return a URL appropriate for the arguments passed.
The arguments could be:
* A model: the model's `get_absolute_url()` function will be called.
* A view name, possibly with arguments: `urlresolvers.reverse()` will
be used to reverse-resolve the name.
* A URL, which will be returned as-is.
"""
# If it's a model, use get_absolute_url()
if hasattr(to, 'get_absolute_url'):
return to.get_absolute_url()
if isinstance(to, Promise):
# Expand the lazy instance, as it can cause issues when it is passed
# further to some Python functions like urlparse.
to = force_text(to)
if isinstance(to, six.string_types):
# Handle relative URLs
if to.startswith(('./', '../')):
return to
# Next try a reverse URL resolution.
try:
return urlresolvers.reverse(to, args=args, kwargs=kwargs)
except urlresolvers.NoReverseMatch:
# If this is a callable, re-raise.
if callable(to):
raise
# If this doesn't "feel" like a URL, re-raise.
if '/' not in to and '.' not in to:
raise
# Finally, fall back and assume it's a URL
return to
def get_prep_value(self, value):
"""
Perform preliminary non-db specific value checks and conversions.
"""
if isinstance(value, Promise):
value = value._proxy____cast()
return value