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36 lines
861 B
36 lines
861 B
5 years ago
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# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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import re
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from six import text_type
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from ...property import Property
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class Ratio(Property):
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"""Ratio property."""
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def __init__(self, name, unit=None, **kwargs):
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"""Constructor."""
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super(Ratio, self).__init__(name, **kwargs)
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self.unit = unit
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ratio_re = re.compile(r'(?P<width>\d+)[:/](?P<height>\d+)')
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def handle(self, value, context):
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"""Handle ratio."""
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match = self.ratio_re.match(text_type(value))
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if match:
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width, height = match.groups()
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if (width, height) == ('0', '1'): # identity
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return 1.
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result = round(float(width) / float(height), 3)
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if self.unit:
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result *= self.unit
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return result
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self.report(value, context)
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