OpenSlides/openslides/utils/utils.py
2018-08-23 17:51:30 +02:00

78 lines
2.2 KiB
Python

import re
from typing import TYPE_CHECKING, Dict, Optional, Tuple, Union
import roman
if TYPE_CHECKING:
# Dummy import Collection for mypy, can be fixed with python 3.7
from .collection import CollectionElement # noqa
CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_1 = re.compile('(.)([A-Z][a-z]+)')
CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_2 = re.compile('([a-z0-9])([A-Z])')
def convert_camel_case_to_pseudo_snake_case(text: str) -> str:
"""
Converts camel case to pseudo snake case using hyphen instead of
underscore.
E. g. ThisText is converted to this-text.
Credits: epost (http://stackoverflow.com/a/1176023)
"""
s1 = CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_1.sub(r'\1-\2', text)
return CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_2.sub(r'\1-\2', s1).lower()
def to_roman(number: int) -> str:
"""
Converts an arabic number within range from 1 to 4999 to the
corresponding roman number. Returns the input converted as string on error
conditions or higher numbers.
"""
try:
return roman.toRoman(number)
except (roman.NotIntegerError, roman.OutOfRangeError):
return str(number)
def get_element_id(collection_string: str, id: int) -> str:
"""
Returns a combined string from the collection_string and an id.
"""
return "{}:{}".format(collection_string, id)
def split_element_id(element_id: Union[str, bytes]) -> Tuple[str, int]:
"""
Splits a combined element_id into the collection_string and the id.
"""
if isinstance(element_id, bytes):
element_id = element_id.decode()
collection_str, id = element_id.rsplit(":", 1)
return (collection_str, int(id))
def get_user_id(user: Optional['CollectionElement']) -> int:
"""
Returns the user id for an CollectionElement user.
Returns 0 for anonymous.
"""
if user is None:
user_id = 0
else:
user_id = user.id
return user_id
def str_dict_to_bytes(str_dict: Dict[str, str]) -> Dict[bytes, bytes]:
"""
Converts the key and the value of a dict from str to bytes.
"""
out = {}
for key, value in str_dict.items():
out[key.encode()] = value.encode()
return out