forked from M-Labs/artiq
language/units: do not quantize
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@ -1,30 +1,53 @@
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from collections import namedtuple
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from fractions import Fraction
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_prefixes_str = "pnum_kM"
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_prefixes_str = "pnum_kMG"
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_smallest_prefix = Fraction(1, 10**12)
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Unit = namedtuple("Unit", "base_prefix name")
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Unit = namedtuple("Unit", "name")
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class DimensionError(Exception):
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pass
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class Quantity:
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def __init__(self, amount, unit):
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self.amount = int(amount)
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self.amount = amount
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self.unit = unit
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def __repr__(self):
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r_amount = self.amount
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r_prefix = self.unit.base_prefix
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if r_amount:
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while not r_amount % 1000 and r_prefix < len(_prefixes_str):
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r_amount //= 1000
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r_prefix += 1
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return str(r_amount) + " " + _prefixes_str[r_prefix] + self.unit.name
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if isinstance(r_amount, int) or isinstance(r_amount, Fraction):
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r_prefix = 0
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r_amount = r_amount/_smallest_prefix
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if r_amount:
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numerator = r_amount.numerator
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while numerator % 1000 == 0 and r_prefix < len(_prefixes_str):
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numerator /= 1000
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r_amount /= 1000
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r_prefix += 1
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prefix_str = _prefixes_str[r_prefix]
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if prefix_str == "_":
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prefix_str = ""
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return str(r_amount) + " " + prefix_str + self.unit.name
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else:
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return str(r_amount) + " " + self.unit.name
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def __rmul__(self, other):
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def __mul__(self, other):
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if isinstance(other, Quantity):
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return NotImplemented
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return Quantity(self.amount*other, self.unit)
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def __rmul__(self, other):
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if isinstance(other, Quantity):
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return NotImplemented
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return Quantity(other*self.amount, self.unit)
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def __truediv__(self, other):
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if isinstance(other, Quantity):
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return NotImplemented
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return Quantity(self.amount/other, self.unit)
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def __floordiv__(self, other):
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if isinstance(other, Quantity):
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return NotImplemented
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return Quantity(self.amount//other, self.unit)
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def __neg__(self):
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return Quantity(-self.amount, self.unit)
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@ -76,17 +99,16 @@ def check_unit(value, unit):
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raise DimensionError
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return value.amount
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def _register_unit(base_prefix, name, prefixes):
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base_prefix_exp = _prefixes_str.index(base_prefix)
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unit = Unit(base_prefix_exp, name)
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globals()["base_"+name+"_unit"] = unit
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for prefix in prefixes:
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prefix_exp = _prefixes_str.index(prefix)
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exp_d = prefix_exp - base_prefix_exp
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assert(exp_d >= 0)
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quantity = Quantity(1000**exp_d, unit)
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full_name = prefix + name if prefix != "_" else name
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globals()[full_name] = quantity
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def _register_unit(name, prefixes):
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unit = Unit(name)
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globals()[name+"_unit"] = unit
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amount = _smallest_prefix
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for prefix in _prefixes_str:
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if prefix in prefixes:
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quantity = Quantity(amount, unit)
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full_name = prefix + name if prefix != "_" else name
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globals()[full_name] = quantity
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amount *= 1000
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_register_unit("p", "s", "pnum_")
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_register_unit("_", "Hz", "_kM")
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_register_unit("s", "pnum_")
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_register_unit("Hz", "_kMG")
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