68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
# pyRCV2: Preferential vote counting
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# Copyright © 2020 Lee Yingtong Li (RunasSudo)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from decimal import Decimal
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import math
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_quantize_exp = 6
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def set_dps(dps):
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global _quantize_exp
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_quantize_exp = Decimal('10') ** -dps
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class Fixed:
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"""
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Wrapper for Python Decimal (for fixed-point arithmetic)
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"""
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def __init__(self, val):
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if isinstance(val, Fixed):
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self.impl = val.impl
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else:
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self.impl = Decimal(val).quantize(_quantize_exp)
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def pp(self, dp):
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"""Pretty print to specified number of decimal places"""
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return format(self.impl, '.{}f'.format(dp))
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def to_rational(self):
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"""Convert to an instance of Rational"""
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from pyRCV2.numbers import Rational
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return Rational(self.impl)
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def __add__(self, other):
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return Fixed(self.impl + other.impl)
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def __sub__(self, other):
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return Fixed(self.impl - other.impl)
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def __mul__(self, other):
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return Fixed(self.impl * other.impl)
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def __truediv__(self, other):
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return Fixed(self.impl / other.impl)
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def __eq__(self, other):
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return self.impl == other.impl
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def __gt__(self, other):
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return self.impl > other.impl
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def __ge__(self, other):
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return self.impl >= other.impl
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def __lt__(self, other):
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return self.impl < other.impl
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def __le__(self, other):
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return self.impl <= other.impl
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def __floor__(self):
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return Fixed(math.floor(self.impl))
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