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# Copyright (C) 2015 Chintalagiri Shashank 

# 

# This file is part of Tendril. 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU Affero 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 Affero General Public License for more details. 

# 

# You should have received a copy of the GNU Affero General Public License 

# along with this program.  If not, see <http://www.gnu.org/licenses/>. 

 

 

from decimal import Decimal 

from unitbase import NumericalUnitBase 

 

 

def parse_temperature(value): 

    num_val = Decimal(value[:-1].strip()) 

    ostr = value[-1:] 

    if ostr == 'C': 

        return num_val + Decimal('273.14') 

    elif ostr == 'K': 

        return num_val 

    elif ostr == 'F': 

        return ((num_val - 32) * 5) / 9 + Decimal('273.14') 

 

 

class Temperature(NumericalUnitBase): 

    def __init__(self, value): 

        _ostrs = ['C', 'F', 'K'] 

        _dostr = 'K' 

        _parse_func = parse_temperature 

        super(Temperature, self).__init__(value, _ostrs, _dostr, _parse_func) 

 

    def __repr__(self): 

        return str(self._value) + self._dostr