98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
import re
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from typing import Dict, Generator, Tuple, Type, Union
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import roman
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from django.apps import apps
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from django.db.models import Model
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CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_1 = re.compile("(.)([A-Z][a-z]+)")
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CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_2 = re.compile("([a-z0-9])([A-Z])")
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def convert_camel_case_to_pseudo_snake_case(text: str) -> str:
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"""
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Converts camel case to pseudo snake case using hyphen instead of
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underscore.
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E. g. ThisText is converted to this-text.
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Credits: epost (http://stackoverflow.com/a/1176023)
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"""
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s1 = CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_1.sub(r"\1-\2", text)
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return CAMEL_CASE_TO_PSEUDO_SNAKE_CASE_CONVERSION_REGEX_2.sub(r"\1-\2", s1).lower()
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def to_roman(number: int) -> str:
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"""
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Converts an arabic number within range from 1 to 4999 to the
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corresponding roman number. Returns the input converted as string on error
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conditions or higher numbers.
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"""
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try:
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return roman.toRoman(number)
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except (roman.NotIntegerError, roman.OutOfRangeError):
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return str(number)
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def get_element_id(collection_string: str, id: int) -> str:
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"""
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Returns a combined string from the collection_string and an id.
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"""
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return f"{collection_string}:{id}"
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def split_element_id(element_id: Union[str, bytes]) -> Tuple[str, int]:
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"""
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Splits a combined element_id into the collection_string and the id.
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"""
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if isinstance(element_id, bytes):
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element_id = element_id.decode()
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collection_str, id = element_id.rsplit(":", 1)
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return (collection_str, int(id))
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def str_dict_to_bytes(str_dict: Dict[str, str]) -> Dict[bytes, bytes]:
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"""
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Converts the key and the value of a dict from str to bytes.
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"""
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out = {}
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for key, value in str_dict.items():
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out[key.encode()] = value.encode()
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return out
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_models_to_collection_string: Dict[str, Type[Model]] = {}
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def get_model_from_collection_string(collection_string: str) -> Type[Model]:
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"""
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Returns a model class which belongs to the argument collection_string.
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"""
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def model_generator() -> Generator[Type[Model], None, None]:
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"""
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Yields all models of all apps.
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"""
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for app_config in apps.get_app_configs():
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for model in app_config.get_models():
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yield model
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# On the first run, generate the dict. It can not change at runtime.
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if not _models_to_collection_string:
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for model in model_generator():
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try:
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get_collection_string = model.get_collection_string
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except AttributeError:
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# Skip models which do not have the method get_collection_string.
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pass
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else:
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_models_to_collection_string[get_collection_string()] = model
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try:
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model = _models_to_collection_string[collection_string]
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except KeyError:
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raise ValueError(
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f"Invalid message. A valid collection_string is missing. Got {collection_string}"
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)
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return model
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