kopia lustrzana https://github.com/NanoVNA-Saver/nanovna-saver
107 wiersze
3.6 KiB
Python
107 wiersze
3.6 KiB
Python
# NanoVNASaver
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# A python program to view and export Touchstone data from a NanoVNA
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# Copyright (C) 2019. Rune B. Broberg
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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 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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import math
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from numbers import Number
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PREFIXES = ("y", "z", "a", "f", "p", "n", "µ", "m",
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"", "k", "M", "G", "T", "P", "E", "Z", "Y")
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class Format(object):
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def __init__(self,
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max_nr_digits: int = 6,
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fix_decimals: bool = False,
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space_str: str = "",
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assume_infinity: bool = True,
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min_offset: int = -8,
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max_offset: int = 8):
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assert(min_offset >= -8 and max_offset <= 8 and
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min_offset < max_offset)
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self.max_nr_digits = max_nr_digits
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self.fix_decimals = fix_decimals
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self.space_str = space_str
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self.assume_infinity = assume_infinity
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self.min_offset = min_offset
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self.max_offset = max_offset
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def __repr__(self):
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return (f"{self.__class__.__name__}("
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f"{self.max_nr_digits}, {self.fix_decimals}, "
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f"'{self.space_str}', {self.assume_infinity}, "
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f"{self.min_offset}, {self.max_offset})")
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class Value(object):
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def __init__(self, value: Number = 0, unit: str = "", fmt=Format()):
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self.value = value
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self._unit = unit
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self.fmt = fmt
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def __repr__(self):
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return (f"{self.__class__.__name__}("
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f"{self.value}, '{self._unit}', {self.fmt})")
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def __str__(self):
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fmt = self.fmt
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if fmt.assume_infinity and \
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abs(self.value) >= 10 ** ((fmt.max_offset + 1) * 3):
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return (("-" if self.value < 0 else "") +
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"\N{INFINITY}" + fmt.space_str + self._unit)
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if self.value == 0:
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offset = 0
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else:
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offset = int(math.log10(abs(self.value)) // 3)
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if offset < fmt.min_offset:
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offset = fmt.min_offset
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elif offset > fmt.max_offset:
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offset = fmt.max_offset
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real = self.value / (10 ** (offset * 3))
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if fmt.max_nr_digits < 4:
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formstr = ".0f"
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else:
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fmt.max_nr_digits += (
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(1 if not fmt.fix_decimals and real < 10 else 0) +
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(1 if not fmt.fix_decimals and real < 100 else 0))
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formstr = "." + str(fmt.max_nr_digits - 3) + "f"
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result = format(real, formstr)
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if float(result) == 0.0:
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offset = 0
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return result + fmt.space_str + PREFIXES[offset + 8] + self._unit
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def parse(self, value: str):
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value = value.replace(" ", "") # Ignore spaces
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if self._unit and value.endswith(self._unit): # strip unit
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value = value[:-len(self._unit)]
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factor = 1
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if value[-1] in PREFIXES:
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factor = 10 ** ((PREFIXES.index(value[-1]) - 8) * 3)
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value = value[:-1]
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self.value = float(value) * factor
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return self.value
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@property
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def unit(self):
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return self._unit
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