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# -*- coding: utf-8 -*-
# This file is part of pygal
#
# A python svg graph plotting library
# Copyright © 2012-2016 Kozea
#
# This library is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This library 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with pygal. If not, see <http://www.gnu.org/licenses/>.
"""Value adapters to use when a chart doesn't accept all value types"""
from decimal import Decimal
def positive(x):
"""Return zero if value is negative"""
if x is None:
return
if isinstance(x, str):
return x
if x < 0:
return 0
return x
def not_zero(x):
"""Return None if value is zero"""
if x == 0:
return
return x
def none_to_zero(x):
"""Return 0 if value is None"""
if x is None:
return 0
return x
def decimal_to_float(x):
"""Cast Decimal values to float"""
if isinstance(x, Decimal):
return float(x)
return x
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