Added verticalGlyphForm attribute

Author: svdo

RichString/NSAttributedString+Rich.swift

@@ -103,6 +103,11 @@ extension NSAttributedString: RichString {
     public func expansion(_ expansion: Float) -> NSAttributedString {
         return addingAttribute(NSExpansionAttributeName, value: expansion)
     }
+
+    @available(iOS, unavailable)
+    public func verticalGlyphForm(_ form: Int) -> NSAttributedString {
+        return addingAttribute(NSVerticalGlyphFormAttributeName, value: form)
+    }
 }
 
 // MARK: - Private helpers
@@ -126,7 +131,7 @@ extension NSAttributedString {
 
 // MARK: - Attribute getters
 extension NSAttributedString {
-    private var attrs: [String: Any] {
+    var attrs: [String: Any] {
         var range: NSRange = NSRange()
         let attrs          = self.attributes(at: 0, effectiveRange: &range)
         assert(range.location == 0)
@@ -230,4 +235,9 @@ extension NSAttributedString {
     public var expansion: Float? {
         return attrs[NSExpansionAttributeName] as? Float
     }
+
+    @available(iOS, unavailable)
+    public var verticalGlyphForm: Int? {
+        return attrs[NSVerticalGlyphFormAttributeName] as? Int
+    }
 }

RichString/RichString.swift

@@ -61,4 +61,6 @@ public protocol RichString {
     func obliqueness(_ obliqueness: Float) -> NSAttributedString
 
     func expansion(_ expansion: Float) -> NSAttributedString
+
+    func verticalGlyphForm(_ form: Int) -> NSAttributedString
 }

RichString/String+Rich.swift

@@ -88,6 +88,11 @@ extension NonAttributedString {
     public func expansion(_ expansion: Float) -> NSAttributedString {
         return rich.expansion(expansion)
     }
+
+    @available(iOS, unavailable)
+    public func verticalGlyphForm(_ form: Int) -> NSAttributedString {
+        return rich.verticalGlyphForm(form)
+    }
 }
 
 extension String: NonAttributedString {

RichStringTests/NSAttributedString+RichSpec.swift

@@ -160,6 +160,13 @@ class RichSpec: QuickConfiguration {
                 let result = richString.expansion(1.23)
                 expect(result.expansion) ≈ 1.23
             }
+
+            #if os(macOS)
+                it("can set vertical glyph format") {
+                    let result = richString.verticalGlyphForm(1)
+                    expect(result.verticalGlyphForm) == 1
+                }
+            #endif
         }
     }
 }