inatial Support for comments modifiers

Author: iMostfa

Sources/SwiftSyntaxBuilder/BuildableNodes.swift.gyb

@@ -31,6 +31,7 @@ public struct ${type.buildable()}: ${base_type.buildable()}, ${type.expressible_
 %   for child in children:
   let ${child.name()}: ${child.type().buildable()}
 %   end
+  public var itemLeadingTrivia: Trivia?
 
   /// Creates a `${type.buildable()}` using the provided parameters.
   /// - Parameters:
@@ -107,7 +108,7 @@ public struct ${type.buildable()}: ${base_type.buildable()}, ${type.expressible_
   /// Conformance to `${base_type.buildable()}`.
   public func build${base_type.base_name()}(format: Format, leadingTrivia: Trivia? = nil) -> ${base_type.syntax()} {
     let result = build${type.base_name()}(format: format, leadingTrivia: leadingTrivia)
-    return ${base_type.syntax()}(result)
+    return ${base_type.syntax()}(result).withLeadingTrivia(itemLeadingTrivia ?? .zero)
   }
 
   /// Conformance to `${type.expressible_as()}`.
@@ -130,5 +131,24 @@ public struct ${type.buildable()}: ${base_type.buildable()}, ${type.expressible_
     return self
   }
 % end
+  
+   public func withDocBlokComment(_ text: String) -> Self {
+    let piece = TriviaPiece.docBlockComment("/** \(text) */")
+    return addCommentPiece(commentPiece: piece)
+  }
+  
+   public func withLineComment(_ text: String) -> Self {
+     let piece = TriviaPiece.lineComment("// \(text)")
+    return addCommentPiece(commentPiece: piece)
+  }
+  
+  private  func addCommentPiece(commentPiece: TriviaPiece) -> Self {
+    var newSelf = self
+    newSelf.itemLeadingTrivia = itemLeadingTrivia?
+      .appending(commentPiece)
+      .appending(.newlines(1)) ?? [commentPiece, .newlines(1)]
+    return newSelf
+  }
+  
 }
 % end