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29 lines
932 B
Haskell
29 lines
932 B
Haskell
module VerifyUtf8Width where
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import Verify
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import Graphics.Text.Width
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import Graphics.Vty.Attributes
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import Graphics.Vty.Picture
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sw_is_1_column :: SingleColumnChar -> Bool
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sw_is_1_column (SingleColumnChar c) = image_width (char def_attr c) == 1
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dw_is_2_column :: DoubleColumnChar -> Bool
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dw_is_2_column (DoubleColumnChar c) = image_width (char def_attr c) == 2
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dc_string_is_even :: NonEmptyList DoubleColumnChar -> Bool
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dc_string_is_even (NonEmpty dw_list) =
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even $ safe_wcswidth [ c | DoubleColumnChar c <- dw_list ]
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safe_wcwidth_for_control_chars :: Bool
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safe_wcwidth_for_control_chars = 0 == safe_wcwidth '\NUL'
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tests :: IO [Test]
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tests = return
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[ verify "sw_is_1_column" sw_is_1_column
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, verify "dw_is_2_column" dw_is_2_column
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, verify "a string of double characters is an even width" dc_string_is_even
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, verify "safe_wcwidth provides a width of 0 for chars without widths" safe_wcwidth_for_control_chars
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]
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