90 lines
2.2 KiB
Python
90 lines
2.2 KiB
Python
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from __future__ import annotations
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import math
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import typing
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import uuid
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T = typing.TypeVar("T")
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class Convertor(typing.Generic[T]):
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regex: typing.ClassVar[str] = ""
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def convert(self, value: str) -> T:
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raise NotImplementedError() # pragma: no cover
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def to_string(self, value: T) -> str:
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raise NotImplementedError() # pragma: no cover
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class StringConvertor(Convertor[str]):
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regex = "[^/]+"
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def convert(self, value: str) -> str:
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return value
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def to_string(self, value: str) -> str:
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value = str(value)
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assert "/" not in value, "May not contain path separators"
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assert value, "Must not be empty"
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return value
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class PathConvertor(Convertor[str]):
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regex = ".*"
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def convert(self, value: str) -> str:
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return str(value)
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def to_string(self, value: str) -> str:
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return str(value)
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class IntegerConvertor(Convertor[int]):
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regex = "[0-9]+"
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def convert(self, value: str) -> int:
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return int(value)
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def to_string(self, value: int) -> str:
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value = int(value)
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assert value >= 0, "Negative integers are not supported"
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return str(value)
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class FloatConvertor(Convertor[float]):
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regex = r"[0-9]+(\.[0-9]+)?"
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def convert(self, value: str) -> float:
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return float(value)
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def to_string(self, value: float) -> str:
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value = float(value)
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assert value >= 0.0, "Negative floats are not supported"
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assert not math.isnan(value), "NaN values are not supported"
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assert not math.isinf(value), "Infinite values are not supported"
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return ("%0.20f" % value).rstrip("0").rstrip(".")
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class UUIDConvertor(Convertor[uuid.UUID]):
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regex = "[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}"
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def convert(self, value: str) -> uuid.UUID:
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return uuid.UUID(value)
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def to_string(self, value: uuid.UUID) -> str:
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return str(value)
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CONVERTOR_TYPES: dict[str, Convertor[typing.Any]] = {
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"str": StringConvertor(),
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"path": PathConvertor(),
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"int": IntegerConvertor(),
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"float": FloatConvertor(),
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"uuid": UUIDConvertor(),
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}
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def register_url_convertor(key: str, convertor: Convertor[typing.Any]) -> None:
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CONVERTOR_TYPES[key] = convertor
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