Add Conditional and Loop String Builder

README.md

@@ -48,7 +48,35 @@ let attributedString = NSAttributedString {
 
 ```
 
+Add  Conditional String Builder and Loop String Builder
+
+```Swift
+@NSAttributedStringBuilder
+var attributedString:NSAttributedString{
+    AText("Hello world")
+         .attribute(.foregroundColor, value: Color.blue)
+
+   for character in ["a", "b", "c", "d"] {
+       AText(character)
+            .backgroundColor(UIColor.red)
+            .alignment(.left)
+   }
+
+   if condition {
+       AText("True")
+            .foregroundColor(UIColor.black)
+   }
+   else{
+       AText("False")
+            .backgroundColor(UIColor.yellow)
+   }
+}
+```
+
+
+
 ## Requirements
+
 Xcode 12.5. This project uses Swift 5.4 feature [Result Builder](https://github.com/apple/swift-evolution/blob/main/proposals/0289-result-builders.md).
 
 ## Installation

Sources/NSAttributedStringBuilder/NSAttributedStringBuilder.swift

@@ -13,17 +13,49 @@ public typealias Attributes = [NSAttributedString.Key: Any]
 
 @resultBuilder
 public enum NSAttributedStringBuilder {
+    public static func buildOptional(_ component: NSAttributedString?) -> Component {
+
+        if let content = component {
+            return AText(content.string, attributes: content.attributesAll)
+        }
+        else{
+            return AText("")
+        }
+    }
+
     public static func buildBlock(_ components: Component...) -> NSAttributedString {
         let mas = NSMutableAttributedString(string: "")
         for component in components {
             mas.append(component.attributedString)
         }
         return mas
     }
+
+    public static func buildEither(first component: NSAttributedString) -> Component {
+        return AText(component.string, attributes: component.attributesAll)
+    }
+
+    public static func buildEither(second component: NSAttributedString) -> Component {
+        return AText(component.string, attributes: component.attributesAll)
+    }
+
+    public static func buildArray(_ components: [NSAttributedString]) -> Component {
+        let mas = NSMutableAttributedString(string: "")
+        for component in components {
+            mas.append(component)
+        }
+        return AText(mas.string, attributes: mas.attributes(at: 0, effectiveRange: nil))
+    }
+
 }
 
 public extension NSAttributedString {
     convenience init(@NSAttributedStringBuilder _ builder: () -> NSAttributedString) {
         self.init(attributedString: builder())
     }
+
+    var attributesAll:[NSAttributedString.Key : Any] {
+        self.attributes(at: 0, effectiveRange: nil)
+    }
+
 }