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29 lines
880 B
Haskell
29 lines
880 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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swIs1Column :: SingleColumnChar -> Bool
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swIs1Column (SingleColumnChar c) = imageWidth (char defAttr c) == 1
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dwIs2Column :: DoubleColumnChar -> Bool
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dwIs2Column (DoubleColumnChar c) = imageWidth (char defAttr c) == 2
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dcStringIsEven :: NonEmptyList DoubleColumnChar -> Bool
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dcStringIsEven (NonEmpty dw_list) =
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even $ safeWcswidth [ c | DoubleColumnChar c <- dw_list ]
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safeWcwidthForControlChars :: Bool
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safeWcwidthForControlChars = 0 == safeWcwidth '\NUL'
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tests :: IO [Test]
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tests = return
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[ verify "swIs1Column" swIs1Column
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, verify "dwIs2Column" dwIs2Column
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, verify "a string of double characters is an even width" dcStringIsEven
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, verify "safeWcwidth provides a width of 0 for chars without widths" safeWcwidthForControlChars
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]
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