CFAttributedStringGetStatisticalWritingDirections(_:_:_:_:_:)

Declaration

func CFAttributedStringGetStatisticalWritingDirections(_ attributedString: CFAttributedString!, _ range: CFRange, _ baseDirection: Int8, _ bidiLevels: UnsafeMutablePointer<UInt8>!, _ baseDirections: UnsafeMutablePointer<UInt8>!) -> Bool

Discussion

If baseDirection is not NSWritingDirectionNatural, result comes from CFAttributedStringGetBidiLevelsAndResolvedDirections; otherwise, it fills bidiLevels by applying a statistical approach (a paragraph is RTL if 40% or more of its words are RTL) to the characters in range. Returns true if the result is not uni-level LTR (in other words, needing further Bidi processing). baseDirection is NSWritingDirection (NSWritingDirectionNatural, NSWritingDirectionLeftToRight, and NSWritingDirectionRightToLeft). Understands NSWritingDirectionAttributeName values.