cpython/Lib/test/test_pyrepl/test_utils.py

from unittest import TestCase

from _pyrepl.utils import str_width, wlen


class TestUtils(TestCase):
    def test_str_width(self):
        characters = [
            'a',
            '1',
            '_',
            '!',
            '\x1a',
            '\u263A',
            '\uffb9',
            '\N{LATIN SMALL LETTER E WITH ACUTE}',  # é
            '\N{LATIN SMALL LETTER E WITH CEDILLA}', # ȩ
            '\u00ad',
        ]
        for c in characters:
            self.assertEqual(str_width(c), 1)

        zero_width_characters = [
            '\N{COMBINING ACUTE ACCENT}',
            '\N{ZERO WIDTH JOINER}',
        ]
        for c in zero_width_characters:
            with self.subTest(character=c):
                self.assertEqual(str_width(c), 0)

        characters = [chr(99989), chr(99999)]
        for c in characters:
            self.assertEqual(str_width(c), 2)

    def test_wlen(self):
        for c in ['a', 'b', '1', '!', '_']:
            self.assertEqual(wlen(c), 1)
        self.assertEqual(wlen('\x1a'), 2)

        char_east_asian_width_N = chr(3800)
        self.assertEqual(wlen(char_east_asian_width_N), 1)
        char_east_asian_width_W = chr(4352)
        self.assertEqual(wlen(char_east_asian_width_W), 2)

        self.assertEqual(wlen('hello'), 5)
        self.assertEqual(wlen('hello' + '\x1a'), 7)
        self.assertEqual(wlen('e\N{COMBINING ACUTE ACCENT}'), 1)
        self.assertEqual(wlen('a\N{ZERO WIDTH JOINER}b'), 2)