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67 lines
2.0 KiB
Python
67 lines
2.0 KiB
Python
from decimal import Decimal
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from django.utils.translation import gettext as _
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from dcim.choices import CableLengthUnitChoices, WeightUnitChoices
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__all__ = (
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'to_grams',
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'to_meters',
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)
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def to_grams(weight, unit):
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"""
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Convert the given weight to kilograms.
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"""
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try:
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if weight < 0:
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raise ValueError(_("Weight must be a positive number"))
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except TypeError:
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raise TypeError(_("Invalid value '{weight}' for weight (must be a number)").format(weight=weight))
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if unit == WeightUnitChoices.UNIT_KILOGRAM:
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return weight * 1000
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if unit == WeightUnitChoices.UNIT_GRAM:
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return weight
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if unit == WeightUnitChoices.UNIT_POUND:
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return weight * Decimal(453.592)
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if unit == WeightUnitChoices.UNIT_OUNCE:
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return weight * Decimal(28.3495)
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raise ValueError(
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_("Unknown unit {unit}. Must be one of the following: {valid_units}").format(
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unit=unit,
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valid_units=', '.join(WeightUnitChoices.values())
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)
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)
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def to_meters(length, unit):
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"""
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Convert the given length to meters.
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"""
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try:
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if length < 0:
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raise ValueError(_("Length must be a positive number"))
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except TypeError:
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raise TypeError(_("Invalid value '{length}' for length (must be a number)").format(length=length))
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if unit == CableLengthUnitChoices.UNIT_KILOMETER:
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return length * 1000
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if unit == CableLengthUnitChoices.UNIT_METER:
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return length
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if unit == CableLengthUnitChoices.UNIT_CENTIMETER:
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return length / 100
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if unit == CableLengthUnitChoices.UNIT_MILE:
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return length * Decimal(1609.344)
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if unit == CableLengthUnitChoices.UNIT_FOOT:
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return length * Decimal(0.3048)
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if unit == CableLengthUnitChoices.UNIT_INCH:
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return length * Decimal(0.0254)
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raise ValueError(
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_("Unknown unit {unit}. Must be one of the following: {valid_units}").format(
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unit=unit,
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valid_units=', '.join(CableLengthUnitChoices.values())
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)
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)
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