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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/>.
"""
Formatters to use with `value_formatter` and `x_value_formatter` configs
"""
from __future__ import division
from datetime import date, datetime, time
from math import floor, log
from pygal.util import float_format
class Formatter(object):
pass
class HumanReadable(Formatter):
"""Format a number to engineer scale"""
ORDERS = "yzafpnµm kMGTPEZY"
def __init__(self, none_char='∅'):
self.none_char = none_char
def __call__(self, val):
if val is None:
return self.none_char
order = val and int(floor(log(abs(val)) / log(1000)))
orders = self.ORDERS.split(" ")[int(order > 0)]
if order == 0 or order > len(orders):
return float_format(val / (1000**int(order)))
return (
float_format(val / (1000**int(order))) +
orders[int(order) - int(order > 0)]
)
class Significant(Formatter):
"""Show precision significant digit of float"""
def __init__(self, precision=10):
self.format = '%%.%dg' % precision
def __call__(self, val):
if val is None:
return ''
return self.format % val
class Integer(Formatter):
"""Cast number to integer"""
def __call__(self, val):
if val is None:
return ''
return '%d' % val
class Raw(Formatter):
"""Cast everything to string"""
def __call__(self, val):
if val is None:
return ''
return str(val)
class IsoDateTime(Formatter):
"""Iso format datetimes"""
def __call__(self, val):
if val is None:
return ''
return val.isoformat()
class Default(Significant, IsoDateTime, Raw):
"""Try to guess best format from type"""
def __call__(self, val):
if val is None:
return ''
if isinstance(val, (int, float)):
return Significant.__call__(self, val)
if isinstance(val, (date, time, datetime)):
return IsoDateTime.__call__(self, val)
return Raw.__call__(self, val)
# Formatters with default options
human_readable = HumanReadable()
significant = Significant()
integer = Integer()
raw = Raw()
# Default config formatter
default = Default()
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