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* don’t run pylint * use jax config * minimum python version * fix py versions * ignore pypy for now Signed-off-by: nstarman <nstarman@users.noreply.github.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| """Paired down UnitSystem class from gala. | ||
| See gala's license below. | ||
| ``` | ||
| The MIT License (MIT) | ||
| Copyright (c) 2012-2023 Adrian M. Price-Whelan | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| ``` | ||
| """ | ||
|
|
||
| from __future__ import annotations | ||
|
|
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| from typing import Any, ClassVar | ||
|
|
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| __all__ = [ | ||
| "UnitSystem", | ||
| "DimensionlessUnitSystem", | ||
| "galactic", | ||
| "dimensionless", | ||
| "solarsystem", | ||
| ] | ||
|
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|
|
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| import astropy.units as u | ||
|
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|
|
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| class UnitSystem: | ||
| """Represents a system of units.""" | ||
|
|
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| _core_units: list[u.UnitBase] | ||
| _registry: dict[u.PhysicalType, u.UnitBase] | ||
|
|
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| _required_physical_types: ClassVar[list[u.PhysicalType]] = [ | ||
| u.get_physical_type("length"), | ||
| u.get_physical_type("time"), | ||
| u.get_physical_type("mass"), | ||
| u.get_physical_type("angle"), | ||
| ] | ||
|
|
||
| def __init__(self, units: UnitSystem | u.UnitBase, *args: u.UnitBase): | ||
| if isinstance(units, UnitSystem): | ||
| if len(args) > 0: | ||
| msg = "If passing in a UnitSystem instance, you cannot pass in additional units." | ||
| raise ValueError(msg) | ||
|
|
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| self._registry = units._registry.copy() | ||
| self._core_units = units._core_units | ||
| return | ||
|
|
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| units = (units, *args) | ||
|
|
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| self._registry = {} | ||
| for unit in units: | ||
| unit_ = ( | ||
| unit if isinstance(unit, u.UnitBase) else u.def_unit(f"{unit!s}", unit) | ||
| ) | ||
| if unit_.physical_type in self._registry: | ||
| msg = f"Multiple units passed in with type {unit_.physical_type!r}" | ||
| raise ValueError(msg) | ||
| self._registry[unit_.physical_type] = unit_ | ||
|
|
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| self._core_units = [] | ||
| for phys_type in self._required_physical_types: | ||
| if phys_type not in self._registry: | ||
| msg = f"You must specify a unit for the physical type {phys_type!r}" | ||
| raise ValueError(msg) | ||
| self._core_units.append(self._registry[phys_type]) | ||
|
|
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| def __getitem__(self, key: str | u.PhysicalType) -> u.UnitBase: | ||
| key = u.get_physical_type(key) | ||
| return self._registry[key] | ||
|
|
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| def __len__(self) -> int: | ||
| return len(self._core_units) | ||
|
|
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| def __iter__(self) -> u.UnitBase: | ||
| yield from self._core_units | ||
|
|
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| def __repr__(self) -> str: | ||
| return f"UnitSystem({', '.join(str(uu) for uu in self._core_units)})" | ||
|
|
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| def __eq__(self, other: Any) -> bool: | ||
| return bool(self._registry == other._registry) | ||
|
|
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| def __ne__(self, other: Any) -> bool: | ||
| return not self.__eq__(other) | ||
|
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|
|
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| class DimensionlessUnitSystem(UnitSystem): | ||
| _required_physical_types: ClassVar[list[u.PhysicalType]] = [] | ||
|
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| def __init__(self) -> None: | ||
| self._core_units = [u.one] | ||
| self._registry = {"dimensionless": u.one} | ||
|
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| def __getitem__(self, key: str) -> u.UnitBase: | ||
| return u.one | ||
|
|
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| def __str__(self) -> str: | ||
| return "UnitSystem(dimensionless)" | ||
|
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|
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| # define galactic unit system | ||
| galactic = UnitSystem(u.kpc, u.Myr, u.Msun, u.radian, u.km / u.s) | ||
|
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| # solar system units | ||
| solarsystem = UnitSystem(u.au, u.M_sun, u.yr, u.radian) | ||
|
|
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| # dimensionless | ||
| dimensionless = DimensionlessUnitSystem() |
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