Created
December 22, 2012 16:28
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A system for converting between measurement systems
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#!/usr/bin/env python | |
# This program is free software: you can redistribute it and/or modify | |
# it under the terms of the GNU General Public License as published by | |
# the Free Software Foundation, either version 3 of the License, or | |
# (at your option) any later version. | |
# | |
# This program is distributed in the hope that it will be useful, | |
# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
# GNU General Public License for more details. | |
# | |
# You should have received a copy of the GNU General Public License | |
# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
from decimal import Decimal | |
class Measure(object): | |
MG = 0 | |
MILLIGRAM = 1 | |
MILLIGRAMS = 2 | |
GM = 3 | |
GRAMS = 4 | |
GRAM = 5 | |
G = 6 | |
OZ = 7 | |
OUNCES = 8 | |
OUNCE = 9 | |
LB = 10 | |
LBS = 11 | |
POUNDS = 12 | |
POUND = 13 | |
KG = 14 | |
KILOS = 15 | |
KILOGRAMS = 16 | |
KILOGRAM = 17 | |
ML = 18 | |
MILLILITERS = 19 | |
MILLILITER = 20 | |
MILS = 21 | |
TSP = 22 | |
TEASPOON = 23 | |
TEASPOONS = 24 | |
TBLS = 25 | |
TBSP = 26 | |
TABLESPOON = 27 | |
TABLESPOONS = 28 | |
CUP = 29 | |
CUPS = 30 | |
PT = 31 | |
PINT = 32 | |
PINTS = 33 | |
QT = 34 | |
QUART = 35 | |
QUARTS = 36 | |
L = 37 | |
LITER = 38 | |
LITERS = 39 | |
GAL = 40 | |
GALLON = 41 | |
GALLONS = 42 | |
ITEMS = 43 | |
ITEM = 44 | |
mg = [MG, MILLIGRAM, MILLIGRAMS] | |
gm = [GM, GRAMS, GRAM, G] | |
oz = [OZ, OUNCES, OUNCE] | |
lb = [LB, LBS, POUNDS, POUND] | |
kg = [KG, KILOS, KILOGRAMS, KILOGRAM] | |
ml = [ML, MILLILITER, MILLILITERS] | |
tsp = [TSP, TEASPOON, TEASPOONS] | |
tbls = [TBLS, TBSP, TABLESPOON, TABLESPOONS] | |
cup = [CUP, CUPS] | |
pt = [PT, PINT, PINTS] | |
qt = [QT, QUART, QUARTS] | |
l = [L, LITER, LITERS] | |
gal = [GAL, GALLON, GALLONS] | |
item = [ITEM, ITEMS] | |
measures = ['mg', 'milligram', 'milligrams', 'gm', 'grams', 'gram', 'g', 'oz', 'ounces', 'ounce', 'lb', 'lbs', 'pounds', 'pound', 'kg', 'kilos', 'kilograms', 'kilogram', 'ml', 'milliliters', 'milliliter', 'mils', 'tsp', 'teaspoon', 'teaspoons', 'tbls', 'tbsp', 'tablespoon', 'tablespoons', 'cup', 'cups', 'pt', 'pint', 'pints', 'qt', 'quart', 'quarts', 'l', 'liter', 'liters', 'gal', 'gallon', 'gallons', 'items', 'item'] | |
weights = [MG, MILLIGRAM, MILLIGRAMS, GM, GRAMS, GRAM, G, OZ, OUNCES, | |
OUNCE, LB, LBS, POUNDS, POUND, KG, KILOS, KILOGRAMS, KILOGRAM] | |
volumes = [OZ, OUNCES, OUNCE, ML, MILLILITERS, MILLILITER, MILS, TSP, | |
TEASPOON, TEASPOONS, CUP, CUPS, PT, PINT, PINTS, QT, QUART, | |
QUARTS, L, LITER, LITERS, GAL, GALLON, GALLONS] | |
FAHRENHEIT = 0 | |
CELSIUS = 1 | |
F = 2 | |
C = 3 | |
temperatures = ['fahrenheit', 'celsius', 'f', 'c'] | |
f = [FAHRENHEIT, F] | |
c = [CELSIUS, C] | |
temps = [FAHRENHEIT, CELSIUS, F, C] | |
matters = weights + volumes | |
MIN = 0 | |
MINUTE = 1 | |
MINUTES = 2 | |
HRS = 3 | |
HOUR = 4 | |
HOURS = 5 | |
DAYS = 6 | |
DAY = 7 | |
WEEKS = 8 | |
WEEK = 9 | |
HR = 10 | |
timing_parts = ['min', 'minute', 'minutes', 'hrs', 'hour', 'hours', | |
'days', 'day', 'weeks', 'week', 'hr'] | |
minute = [MIN, MINUTE, MINUTES] | |
hr = [HRS, HOUR, HOURS, HR] | |
day = [DAYS, DAY] | |
week = [WEEK, WEEKS] | |
times = minute + hr + day + week | |
TIME = 0 | |
MATTER = 1 | |
TEMPERATURE = 2 | |
all_strings = timing_parts + measures + temperatures | |
convert_dict = { | |
KG: {OZ: Decimal("35.27"), LB: Decimal("2.21"), MG: Decimal("1000000"), GM: Decimal("1000")}, | |
OZ: {KG: Decimal('0.03'), LB: Decimal('0.06'), MG: Decimal("28349.52"), GM: Decimal("28.35"), ML: Decimal('29.57'), TSP: Decimal('6'), TBSP: Decimal('2'), PT: Decimal('0.0625'), QT: Decimal('.0313'), CUP: Decimal('0.125'), GAL: Decimal('0.008')}, | |
LB: {OZ: Decimal('16'), KG: Decimal('0.45'), MG: Decimal('453592.37'), GM: Decimal('45.36')}, | |
GM: {OZ: Decimal('0.03'), LB: Decimal('0.002'), MG: Decimal('1000'), KG: Decimal('0.001')}, | |
MG: {OZ: Decimal('0.00004'), LB: Decimal('0.000002'), KG: Decimal('0.000001'), GM: Decimal('0.001')}, | |
ML: {OZ: Decimal('0.034'), TSP: Decimal('0.20'), TBSP: Decimal('0.068'), CUP: Decimal('0.004'), PT: Decimal('0.002'), QT: Decimal('0.001'), L: Decimal('0.001'), GAL: Decimal('0.0003')}, | |
TSP: {OZ: Decimal('0.167'), ML: Decimal('4.93'), TBSP: Decimal('0.333'), CUP: Decimal('0.021'), PT: Decimal('0.01'), QT: Decimal('0.005'), L: Decimal('0.005'), GAL: Decimal('0.001')}, | |
TBSP: {OZ: Decimal('0.333'), ML: Decimal('14.78'), TSP: Decimal('3'), CUP: Decimal('0.063'), PT: Decimal('0.031'), QT: Decimal('0.016'), L: Decimal('0.015'), GAL: Decimal('0.004')}, | |
CUP: {OZ: Decimal('8'), ML: Decimal('236.59'), TSP: Decimal('48'), TBSP: Decimal('16'), PT: Decimal('0.5'), QT: Decimal('0.25'), L: Decimal('0.247'), GAL: Decimal('0.063')}, | |
PT: {OZ: Decimal('16'), ML: Decimal('473.18'), TSP: Decimal('96'), TBSP: Decimal('32'), CUP: Decimal('2'), QT: Decimal('0.5'), L: Decimal('0.47'), GAL: Decimal('0.125')}, | |
QT: {OZ: Decimal('32'), ML: Decimal('946.35'), TSP: Decimal('192'), TBSP: Decimal('64'), PT: Decimal('2'), CUP: Decimal('4'), L: Decimal('0.95'), GAL: Decimal('0.25')}, | |
L: {OZ: Decimal('33.81'), ML: Decimal('1000'), TSP: Decimal('202.88'), TBSP: Decimal('67.63'), PT: Decimal('2.11'), QT: Decimal('1.06'), CUP: Decimal('4.23'), GAL: Decimal('0.26')}, | |
GAL: {OZ: Decimal('128'), ML: Decimal('3785.41'), TSP: Decimal('768'), TBSP: Decimal('256'), PT: Decimal('8'), QT: Decimal('4'), CUP: Decimal('16'), L: Decimal('3.79')}, | |
} | |
time_convert_dict = { | |
DAY: {WEEK: Decimal('0.143'), HRS: Decimal('24'), MIN: Decimal('1440')}, | |
HRS: {DAY: Decimal('0.042'), WEEK: Decimal('0.0059'), MIN: Decimal('60')}, | |
WEEK: {DAY: Decimal('7'), HRS: Decimal('168'), MIN: Decimal('10080')}, | |
MIN: {WEEK: Decimal('0.00099'), HOUR: Decimal('0.017'), DAY:Decimal('0.0007')}, | |
} | |
def __init__(self, amount_str): | |
self.amount_str = amount_str | |
self.converted = 0 | |
self.convert_type = None | |
self._parseAmount() | |
def _parseAmount(self): | |
if ' ' in self.amount_str: | |
(val, unit) = self.amount_str.split(' ') | |
unit = unit.lower() | |
else: | |
matched = False | |
for x, c in enumerate(self.amount_str): | |
if matched: | |
break | |
if type(self.amount_str[x]) == type(''): | |
start_pos = x | |
matched = True | |
val = self. amount_str[:start_pos-1] | |
unit = self.amount_str[start_pos:].lower() | |
if unit in self.measures: | |
self.unit = self._getStandardUnit(self.measures.index(unit), self.MATTER) | |
self.unit_type = self.MATTER | |
elif unit in self.timing_parts: | |
self.unit = self._getStandardUnit(self.timing_parts.index(unit), self.TIME) | |
self.unit_type = self.TIME | |
elif unit in self.temperatures: | |
self.unit = self._getStandardUnit(self.temperatures.index(unit), self.TEMPERATURE) | |
self.unit_type = self.TEMPERATURE | |
else: | |
raise ValueError('%s is not a known type of measurement' % unit) | |
try: | |
self.count = Decimal("%s" % val) | |
except ValueError: | |
raise ValueError('%s is not a valid number' % val) | |
self.count = 0.0 | |
def _getStandardUnit(self, unit, unit_type): | |
if unit_type == self.TEMPERATURE: | |
if unit in self.c: | |
return self.C | |
elif unit in self.f: | |
return self.F | |
else: | |
raise ValueError('I thought %s was a measure of temperature.'% self.temperatures[unit]) | |
elif unit_type == self.TIME: | |
if unit in self.day: | |
return self.DAY | |
elif unit in self.hr: | |
return self.HRS | |
elif unit in self.week: | |
return self.WEEK | |
elif unit in self.minute: | |
return self.MIN | |
else: | |
raise ValueError('I thought %s was a measure of time' % self.timing_parts[unit]) | |
elif unit_type == self.MATTER: | |
if unit in self.mg: | |
return self.MG | |
elif unit in self.gm: | |
return self.GM | |
elif unit in self.oz: | |
return self.OZ | |
elif unit in self.lb: | |
return self.LB | |
elif unit in self.kg: | |
return self.KG | |
elif unit in self.ml: | |
return self.ML | |
elif unit in self.tsp: | |
return self.TSP | |
elif unit in self.tbls: | |
return self.TBSP | |
elif unit in self.cup: | |
return self.CUP | |
elif unit in self.pt: | |
return self.PT | |
elif unit in self.qt: | |
return self.QT | |
elif unit in self.l: | |
return self.L | |
elif unit in self.gal: | |
return self.GAL | |
elif unit in self.item: | |
return self.ITEM | |
else: | |
raise ValueError('I thought %s was a measure of physical items' % self.measures[unit]) | |
else: | |
raise ValueError("I'm not sure what type of matter you're trying to measure") | |
def convert(self, convert_to): | |
try: | |
convert_to = convert_to.lower() | |
except SyntaxError: | |
pass | |
# have we done this yet? | |
if self.converted and self.convert_type == convert_to: | |
return self.converted | |
try: | |
if convert_to in self.timing_parts: | |
self.convert_to = self._getStandardUnit(self.timing_parts.index(convert_to), self.TIME) | |
self.convert_type = self.TIME | |
elif convert_to in self.measures: | |
self.convert_to = self._getStandardUnit(self.measures.index(convert_to), self.MATTER) | |
self.convert_type = self.MATTER | |
elif convert_to in self.temperatures: | |
self.convert_to = self._getStandardUnit(self.temperatures.index(convert_to), self.TEMPERATURE) | |
self.convert_type = self.TEMPERATURE | |
elif int(convert_to): | |
if convert_to in self.matters: | |
self.convert_to = self._getStandardUnit(convert_to, self.MATTER) | |
self.convert_type = self.MATTER | |
elif convert_to in self.times: | |
self.convert_to = self._getStandardUnit(convert_to, self.TIME) | |
self.convert_type - self.TIME | |
elif convert_to in self.temps: | |
self.convert_to = self._getStandardUnit(convert_to, self.TEMPERATURE) | |
self.convert_type = self.TEMPERATURE | |
else: | |
raise ValueError("I'm not sure how to convert %s measurement into that %s." % (self.all_strings[self.unit], self.all_strings[convert_to])) | |
return 0 | |
else: | |
raise ValueError("%s is not a valid unit that I know how to convert %s to." % (convert_to, self.all_strings[self.unit])) | |
return 0 | |
except ValueError: | |
raise ValueError("%s is not a valid unit I know how to convert %s to." % (convert_to, self.all_strings[self.unit])) | |
# are we already using the right unit | |
if self.convert_to == self.unit: | |
return self.count | |
if self.convert_type == self.unit_type: | |
if self.convert_type == self.TEMPERATURE: | |
if self.convert_to == self.F: | |
return Decimal("%s" % (((self.count*9)/5)+32)) | |
else: | |
return Decimal("%s" % (((self.count-32)*5)/9)) | |
else: | |
if self.convert_type == self.TIME: | |
conversions = self.time_convert_dict | |
else: | |
conversions = self.convert_dict | |
self.convert_value = conversions[self.unit][self.convert_to] | |
self.converted = self.convert_value * self.count | |
return Decimal("%s" % round(self.converted, 2)) | |
else: | |
raise ValueError("%s and %s are incompatible types" % (self.all_strings[self.convert_type], self.all_strings[self.unit_type])) | |
return 0 | |
def __unicode__(self): | |
if self.unit_type == self.TIME: | |
unit_string = self.timing_parts[self.unit] | |
elif self.unit_type == self.TEMPERATURE: | |
unit_string = self.temperatures[self.unit] | |
else: | |
unit_string = self.measures[self.unit] | |
return "%s %s" % (self.count, unit_string) | |
def __str__(self): | |
return self.__unicode__() | |
def __repr__(self): | |
return self.__unicode__() | |
class ConvertError(Exception): | |
pass |
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