from unittest import TestCase, main

from mypy.util import trim_source_line, split_words


class FancyErrorFormattingTestCases(TestCase):
    def test_trim_source(self) -> None:
        assert trim_source_line('0123456789abcdef',
                                max_len=16, col=5, min_width=2) == ('0123456789abcdef', 0)

        # Locations near start.
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=0, min_width=2) == ('0123456...', 0)
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=4, min_width=2) == ('0123456...', 0)

        # Middle locations.
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=5, min_width=2) == ('...1234567...', -2)
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=6, min_width=2) == ('...2345678...', -1)
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=8, min_width=2) == ('...456789a...', 1)

        # Locations near the end.
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=11, min_width=2) == ('...789abcd...', 4)
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=13, min_width=2) == ('...9abcdef', 6)
        assert trim_source_line('0123456789abcdef',
                                max_len=7, col=15, min_width=2) == ('...9abcdef', 6)

    def test_split_words(self) -> None:
        assert split_words('Simple message') == ['Simple', 'message']
        assert split_words('Message with "Some[Long, Types]"'
                           ' in it') == ['Message', 'with',
                                         '"Some[Long, Types]"', 'in', 'it']
        assert split_words('Message with "Some[Long, Types]"'
                           ' and [error-code]') == ['Message', 'with', '"Some[Long, Types]"',
                                                    'and', '[error-code]']
        assert split_words('"Type[Stands, First]" then words') == ['"Type[Stands, First]"',
                                                                   'then', 'words']
        assert split_words('First words "Then[Stands, Type]"') == ['First', 'words',
                                                                   '"Then[Stands, Type]"']
        assert split_words('"Type[Only, Here]"') == ['"Type[Only, Here]"']
        assert split_words('OneWord') == ['OneWord']
        assert split_words(' ') == ['', '']


if __name__ == '__main__':
    main()