#96 Added support for function builder to compose strings

Author: malcommac

Sources/SwiftRichString/Extensions/AttributedString+FunctionBuilder.swift

@@ -0,0 +1,48 @@
+////
+//  SwiftRichString
+//  Elegant Strings & Attributed Strings Toolkit for Swift
+//
+//  Created by Daniele Margutti.
+//  Copyright © 2018 Daniele Margutti. All rights reserved.
+//
+//    Web: http://www.danielemargutti.com
+//    Email: [email protected]
+//    Twitter: @danielemargutti
+//
+//
+//    Permission is hereby granted, free of charge, to any person obtaining a copy
+//    of this software and associated documentation files (the "Software"), to deal
+//    in the Software without restriction, including without limitation the rights
+//    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//    copies of the Software, and to permit persons to whom the Software is
+//    furnished to do so, subject to the following conditions:
+//
+//    The above copyright notice and this permission notice shall be included in
+//    all copies or substantial portions of the Software.
+//
+//    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//    THE SOFTWARE.
+
+import Foundation
+
+@_functionBuilder
+public class AttributedStringBuilder {
+    public static func buildBlock(_ components: AttributedString...) -> AttributedString {
+        let result = NSMutableAttributedString(string: "")
+        
+        return components.reduce(into: result) { (result, current) in result.append(current) }
+    }
+}
+
+extension AttributedString {
+    
+    public class func composing(@AttributedStringBuilder _ parts: () -> AttributedString) -> AttributedString {
+        return parts()
+    }
+    
+}