You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
3.2 KiB
121 lines
3.2 KiB
import re
|
|
|
|
from collections import OrderedDict
|
|
from copy import deepcopy
|
|
|
|
from ._http import HTTPStatus
|
|
|
|
|
|
FIRST_CAP_RE = re.compile("(.)([A-Z][a-z]+)")
|
|
ALL_CAP_RE = re.compile("([a-z0-9])([A-Z])")
|
|
|
|
|
|
__all__ = (
|
|
"merge",
|
|
"camel_to_dash",
|
|
"default_id",
|
|
"not_none",
|
|
"not_none_sorted",
|
|
"unpack",
|
|
)
|
|
|
|
|
|
def merge(first, second):
|
|
"""
|
|
Recursively merges two dictionaries.
|
|
|
|
Second dictionary values will take precedence over those from the first one.
|
|
Nested dictionaries are merged too.
|
|
|
|
:param dict first: The first dictionary
|
|
:param dict second: The second dictionary
|
|
:return: the resulting merged dictionary
|
|
:rtype: dict
|
|
"""
|
|
if not isinstance(second, dict):
|
|
return second
|
|
result = deepcopy(first)
|
|
for key, value in second.items():
|
|
if key in result and isinstance(result[key], dict):
|
|
result[key] = merge(result[key], value)
|
|
else:
|
|
result[key] = deepcopy(value)
|
|
return result
|
|
|
|
|
|
def camel_to_dash(value):
|
|
"""
|
|
Transform a CamelCase string into a low_dashed one
|
|
|
|
:param str value: a CamelCase string to transform
|
|
:return: the low_dashed string
|
|
:rtype: str
|
|
"""
|
|
first_cap = FIRST_CAP_RE.sub(r"\1_\2", value)
|
|
return ALL_CAP_RE.sub(r"\1_\2", first_cap).lower()
|
|
|
|
|
|
def default_id(resource, method):
|
|
"""Default operation ID generator"""
|
|
return "{0}_{1}".format(method, camel_to_dash(resource))
|
|
|
|
|
|
def not_none(data):
|
|
"""
|
|
Remove all keys where value is None
|
|
|
|
:param dict data: A dictionary with potentially some values set to None
|
|
:return: The same dictionary without the keys with values to ``None``
|
|
:rtype: dict
|
|
"""
|
|
return dict((k, v) for k, v in data.items() if v is not None)
|
|
|
|
|
|
def not_none_sorted(data):
|
|
"""
|
|
Remove all keys where value is None
|
|
|
|
:param OrderedDict data: A dictionary with potentially some values set to None
|
|
:return: The same dictionary without the keys with values to ``None``
|
|
:rtype: OrderedDict
|
|
"""
|
|
return OrderedDict((k, v) for k, v in sorted(data.items()) if v is not None)
|
|
|
|
|
|
def unpack(response, default_code=HTTPStatus.OK):
|
|
"""
|
|
Unpack a Flask standard response.
|
|
|
|
Flask response can be:
|
|
- a single value
|
|
- a 2-tuple ``(value, code)``
|
|
- a 3-tuple ``(value, code, headers)``
|
|
|
|
.. warning::
|
|
|
|
When using this function, you must ensure that the tuple is not the response data.
|
|
To do so, prefer returning list instead of tuple for listings.
|
|
|
|
:param response: A Flask style response
|
|
:param int default_code: The HTTP code to use as default if none is provided
|
|
:return: a 3-tuple ``(data, code, headers)``
|
|
:rtype: tuple
|
|
:raise ValueError: if the response does not have one of the expected format
|
|
"""
|
|
if not isinstance(response, tuple):
|
|
# data only
|
|
return response, default_code, {}
|
|
elif len(response) == 1:
|
|
# data only as tuple
|
|
return response[0], default_code, {}
|
|
elif len(response) == 2:
|
|
# data and code
|
|
data, code = response
|
|
return data, code, {}
|
|
elif len(response) == 3:
|
|
# data, code and headers
|
|
data, code, headers = response
|
|
return data, code or default_code, headers
|
|
else:
|
|
raise ValueError("Too many response values")
|