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1from fontTools.misc.fixedTools import (
2    fixedToFloat,
3    floatToFixed,
4    floatToFixedToStr,
5    fixedToStr,
6    strToFixed,
7    strToFixedToFloat,
8)
9import unittest
10
11
12class FixedToolsTest(unittest.TestCase):
13
14    def test_roundtrip(self):
15        for bits in range(0, 15):
16            for value in range(-(2**(bits+1)), 2**(bits+1)):
17                self.assertEqual(value, floatToFixed(fixedToFloat(value, bits), bits))
18
19    def test_fixedToFloat_precision14(self):
20        self.assertAlmostEqual(0.7999878, fixedToFloat(13107, 14))
21        self.assertEqual(0.0, fixedToFloat(0, 14))
22        self.assertEqual(1.0, fixedToFloat(16384, 14))
23        self.assertEqual(-1.0, fixedToFloat(-16384, 14))
24        self.assertAlmostEqual(0.999939, fixedToFloat(16383, 14))
25        self.assertAlmostEqual(-0.999939, fixedToFloat(-16383, 14))
26
27    def test_fixedToFloat_precision6(self):
28        self.assertAlmostEqual(-9.984375, fixedToFloat(-639, 6))
29        self.assertAlmostEqual(-10.0, fixedToFloat(-640, 6))
30        self.assertAlmostEqual(9.984375, fixedToFloat(639, 6))
31        self.assertAlmostEqual(10.0, fixedToFloat(640, 6))
32
33    def test_fixedToStr_precision14(self):
34        self.assertEqual('0.8', fixedToStr(13107, 14))
35        self.assertEqual('0.0', fixedToStr(0, 14))
36        self.assertEqual('1.0', fixedToStr(16384, 14))
37        self.assertEqual('-1.0', fixedToStr(-16384, 14))
38        self.assertEqual('0.99994', fixedToStr(16383, 14))
39        self.assertEqual('-0.99994', fixedToStr(-16383, 14))
40
41    def test_fixedToStr_precision6(self):
42        self.assertAlmostEqual('-9.98', fixedToStr(-639, 6))
43        self.assertAlmostEqual('-10.0', fixedToStr(-640, 6))
44        self.assertAlmostEqual('9.98', fixedToStr(639, 6))
45        self.assertAlmostEqual('10.0', fixedToStr(640, 6))
46
47    def test_floatToFixed_precision14(self):
48        self.assertEqual(13107, floatToFixed(0.8, 14))
49        self.assertEqual(16384, floatToFixed(1.0, 14))
50        self.assertEqual(16384, floatToFixed(1, 14))
51        self.assertEqual(-16384, floatToFixed(-1.0, 14))
52        self.assertEqual(-16384, floatToFixed(-1, 14))
53        self.assertEqual(0, floatToFixed(0, 14))
54
55    def test_strToFixed_precision14(self):
56        self.assertEqual(13107, strToFixed('0.8', 14))
57        self.assertEqual(16384, strToFixed('1.0', 14))
58        self.assertEqual(16384, strToFixed('1', 14))
59        self.assertEqual(-16384, strToFixed('-1.0', 14))
60        self.assertEqual(-16384, strToFixed('-1', 14))
61        self.assertEqual(0, strToFixed('0', 14))
62
63    def test_strToFixedToFloat_precision14(self):
64        self.assertAlmostEqual(0.7999878, strToFixedToFloat('0.8', 14))
65        self.assertEqual(0.0, strToFixedToFloat('0', 14))
66        self.assertEqual(1.0, strToFixedToFloat('1.0', 14))
67        self.assertEqual(-1.0, strToFixedToFloat('-1.0', 14))
68        self.assertAlmostEqual(0.999939, strToFixedToFloat('0.99994', 14))
69        self.assertAlmostEqual(-0.999939, strToFixedToFloat('-0.99994', 14))
70
71    def test_floatToFixedToStr_precision14(self):
72        self.assertEqual('0.8', floatToFixedToStr(0.7999878, 14))
73        self.assertEqual('1.0', floatToFixedToStr(1.0, 14))
74        self.assertEqual('1.0', floatToFixedToStr(1, 14))
75        self.assertEqual('-1.0', floatToFixedToStr(-1.0, 14))
76        self.assertEqual('-1.0', floatToFixedToStr(-1, 14))
77        self.assertEqual('0.0', floatToFixedToStr(0, 14))
78
79    def test_fixedToFloat_return_float(self):
80        value = fixedToFloat(16384, 14)
81        self.assertIsInstance(value, float)
82
83
84if __name__ == "__main__":
85    import sys
86    sys.exit(unittest.main())
87