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#!/usr/bin/env python3
from numbers import Number
from typing import Callable
import constants
class Converter(object):
def __init__(self,
name: str,
category: str,
to_canonical: Callable,
from_canonical: Callable,
unit: str) -> None:
self.name = name
self.category = category
self.to_canonical_f = to_canonical
self.from_canonical_f = from_canonical
self.unit = unit
def to_canonical(self, n: Number) -> Number:
return self.to_canonical_f(n)
def from_canonical(self, n: Number) -> Number:
return self.from_canonical_f(n)
def unit_suffix(self) -> str:
return self.unit
conversion_catalog = {
"Second": Converter("Second",
"time",
lambda s: s,
lambda s: s,
"s"),
"Minute": Converter("Minute",
"time",
lambda m: (m * constants.SECONDS_PER_MINUTE),
lambda s: (s / constants.SECONDS_PER_MINUTE),
"m"),
"Hour": Converter("Hour",
"time",
lambda h: (h * constants.SECONDS_PER_HOUR),
lambda s: (s / constants.SECONDS_PER_HOUR),
"h"),
"Day": Converter("Day",
"time",
lambda d: (d * constants.SECONDS_PER_DAY),
lambda s: (s / constants.SECONDS_PER_DAY),
"d"),
"Week": Converter("Week",
"time",
lambda w: (w * constants.SECONDS_PER_WEEK),
lambda s: (s / constants.SECONDS_PER_WEEK),
"w"),
"Fahrenheit": Converter("Fahrenheit",
"temperature",
lambda f: (f - 32.0) * 0.55555555,
lambda c: c * 1.8 + 32.0,
"°F"),
"Celsius": Converter("Celsius",
"temperature",
lambda c: c,
lambda c: c,
"°C"),
"Kelvin": Converter("Kelvin",
"temperature",
lambda k: k - 273.15,
lambda c: c + 273.15,
"°K"),
}
def convert(magnitude: Number,
from_thing: str,
to_thing: str) -> float:
src = conversion_catalog.get(from_thing, None)
dst = conversion_catalog.get(to_thing, None)
if src is None or dst is None:
raise ValueError("No known conversion")
if src.category != dst.category:
raise ValueError("Incompatible conversion")
return _convert(magnitude, src, dst)
def _convert(magnitude: Number,
from_unit: Converter,
to_unit: Converter) -> float:
canonical = from_unit.to_canonical(magnitude)
converted = to_unit.from_canonical(canonical)
return float(converted)
def sec_to_min(s: float) -> float:
return convert(s, "Second", "Minute")
def sec_to_hour(s: float) -> float:
return convert(s, "Second", "Hour")
def sec_to_day(s: float) -> float:
return convert(s, "Second", "Day")
def sec_to_week(s: float) -> float:
return convert(s, "Second", "Week")
def min_to_sec(m: float) -> float:
return convert(m, "Minute", "Second")
def min_to_hour(m: float) -> float:
return convert(m, "Minute", "Hour")
def min_to_day(m: float) -> float:
return convert(m, "Minute", "Day")
def min_to_week(m: float) -> float:
return convert(m, "Minute", "Week")
def hour_to_sec(h: float) -> float:
return convert(h, "Hour", "Second")
def hour_to_min(h: float) -> float:
return convert(h, "Hour", "Minute")
def hour_to_day(h: float) -> float:
return convert(h, "Hour", "Day")
def hour_to_week(h: float) -> float:
return convert(h, "Hour", "Week")
def day_to_sec(d: float) -> float:
return convert(d, "Day", "Second")
def day_to_min(d: float) -> float:
return convert(d, "Day", "Minute")
def day_to_hour(d: float) -> float:
return convert(d, "Day", "Hour")
def day_to_week(d: float) -> float:
return convert(d, "Day", "Week")
def week_to_sec(w: float) -> float:
return convert(w, "Week", "Second")
def week_to_min(w: float) -> float:
return convert(w, "Week", "Minute")
def week_to_hour(w: float) -> float:
return convert(w, "Week", "Hour")
def week_to_day(w: float) -> float:
return convert(w, "Week", "Day")
def f_to_c(temp_f: float) -> float:
"""Fahrenheit to Celsius."""
return convert(temp_f, "Fahrenheit", "Celsius")
def c_to_f(temp_c: float) -> float:
"""Celsius to Fahrenheit."""
return convert(temp_c, "Celsius", "Fahrenheit")
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