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  • Committer: Olivier Tilloy
  • Date: 2010-12-26 18:30:33 UTC
  • mto: This revision was merged to the branch mainline in revision 348.
  • Revision ID: olivier@tilloy.net-20101226183033-m0xvuldnq6bq8jk3
Handle fractions in a transparent manner,
using the convenience functions defined in module pyexiv2.utils.

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test/xmp.py
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from pyexiv2.xmp import XmpTag, XmpValueError, register_namespace, \
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                        unregister_namespace, unregister_namespaces
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from pyexiv2.utils import FixedOffset, Rational, Fraction
 
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from pyexiv2.utils import FixedOffset, make_fraction
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from pyexiv2.metadata import ImageMetadata
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import datetime
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        # Valid values
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        tag = XmpTag('Xmp.xmpDM.videoPixelAspectRatio')
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        self.assertEqual(tag.type, 'Rational')
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        self.assertEqual(tag._convert_to_python('5/3', 'Rational'), Rational(5, 3))
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        self.assertEqual(tag._convert_to_python('-5/3', 'Rational'), Rational(-5, 3))
 
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        self.assertEqual(tag._convert_to_python('5/3', 'Rational'), make_fraction(5, 3))
 
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        self.assertEqual(tag._convert_to_python('-5/3', 'Rational'), make_fraction(-5, 3))
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        # Invalid values
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        self.failUnlessRaises(XmpValueError, tag._convert_to_python, 'invalid', 'Rational')
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        # Valid values
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        tag = XmpTag('Xmp.xmpDM.videoPixelAspectRatio')
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        self.assertEqual(tag.type, 'Rational')
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        self.assertEqual(tag._convert_to_string(Rational(5, 3), 'Rational'), '5/3')
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        self.assertEqual(tag._convert_to_string(Rational(-5, 3), 'Rational'), '-5/3')
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        if Fraction is not None:
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            self.assertEqual(tag._convert_to_string(Fraction('1.6'), 'Rational'), '8/5')
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            self.assertEqual(tag._convert_to_string(Fraction('-1.6'), 'Rational'), '-8/5')
 
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        self.assertEqual(tag._convert_to_string(make_fraction(5, 3), 'Rational'), '5/3')
 
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        self.assertEqual(tag._convert_to_string(make_fraction(-5, 3), 'Rational'), '-5/3')
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        # Invalid values
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        self.failUnlessRaises(XmpValueError, tag._convert_to_string, 'invalid', 'Rational')