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import re
def is_dunder(name: str) -> bool:
return name.startswith("__") and name.endswith("__")
def raise_on_invalid_key_name(name: str) -> None:
# https://docs.mongodb.com/manual/reference/limits/#Restrictions-on-Field-Names
if name.startswith("$"):
raise TypeError("key_name cannot start with the dollar sign ($) character")
if "." in name:
raise TypeError("key_name cannot contain the dot (.) character")
def raise_on_invalid_collection_name(collection_name: str, cls_name: str) -> None:
# https://docs.mongodb.com/manual/reference/limits/#Restriction-on-Collection-Names
if "$" in collection_name:
raise TypeError(f"Invalid collection name for {cls_name}: cannot contain '$'")
if collection_name == "":
raise TypeError(f"Invalid collection name for {cls_name}: cannot be empty")
if collection_name.startswith("system."):
raise TypeError(
f"Invalid collection name for {cls_name}:" " cannot start with 'system.'"
)
def to_snake_case(s: str) -> str:
tmp = re.sub("(.)([A-Z][a-z]+)", r"\1_\2", s)
return re.sub("([a-z0-9])([A-Z])", r"\1_\2", tmp).lower()
class Undefined:
pass
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