114 lines
3.0 KiB
Python
114 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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# This file is part of pygal
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#
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# A python svg graph plotting library
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# Copyright © 2012-2016 Kozea
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#
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# This library is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 3 of the License, or (at your option) any
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# later version.
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#
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# This library is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with pygal. If not, see <http://www.gnu.org/licenses/>.
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"""
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Formatters to use with `value_formatter` and `x_value_formatter` configs
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"""
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from __future__ import division
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from datetime import date, datetime, time
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from math import floor, log
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from pygal._compat import to_str, u
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from pygal.util import float_format
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class Formatter(object):
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pass
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class HumanReadable(Formatter):
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"""Format a number to engineer scale"""
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ORDERS = u("yzafpnµm kMGTPEZY")
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def __init__(self, none_char=u('∅')):
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self.none_char = none_char
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def __call__(self, val):
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if val is None:
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return self.none_char
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order = val and int(floor(log(abs(val)) / log(1000)))
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orders = self.ORDERS.split(" ")[int(order > 0)]
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if order == 0 or order > len(orders):
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return float_format(val / (1000 ** int(order)))
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return (
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float_format(val / (1000 ** int(order))) +
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orders[int(order) - int(order > 0)])
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class Significant(Formatter):
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"""Show precision significant digit of float"""
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def __init__(self, precision=10):
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self.format = '%%.%dg' % precision
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def __call__(self, val):
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if val is None:
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return ''
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return self.format % val
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class Integer(Formatter):
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"""Cast number to integer"""
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def __call__(self, val):
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if val is None:
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return ''
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return '%d' % val
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class Raw(Formatter):
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"""Cast everything to string"""
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def __call__(self, val):
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if val is None:
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return ''
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return to_str(val)
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class IsoDateTime(Formatter):
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"""Iso format datetimes"""
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def __call__(self, val):
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if val is None:
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return ''
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return val.isoformat()
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class Default(Significant, IsoDateTime, Raw):
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"""Try to guess best format from type"""
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def __call__(self, val):
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if val is None:
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return ''
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if isinstance(val, (int, float)):
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return Significant.__call__(self, val)
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if isinstance(val, (date, time, datetime)):
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return IsoDateTime.__call__(self, val)
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return Raw.__call__(self, val)
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# Formatters with default options
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human_readable = HumanReadable()
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significant = Significant()
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integer = Integer()
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raw = Raw()
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# Default config formatter
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default = Default()
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