Generate @resultbuilder with SwiftSyntaxBuilder

Author: kimdv

Package.swift

@@ -81,7 +81,6 @@ let package = Package(
         "BuildableBaseProtocols.swift.gyb",
         "BuildableCollectionNodes.swift.gyb",
         "BuildableNodes.swift.gyb",
-        "ResultBuilders.swift.gyb",
         "TokenSyntax.swift.gyb",
       ]
     ),

Sources/SwiftSyntaxBuilder/ArrayElementConvenienceInitializers.swift

@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2022 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import SwiftSyntax
+
+extension ArrayElement: ExpressibleAsArrayExpr {
+  public func createArrayExpr() -> ArrayExpr {
+    ArrayExpr(elements: ArrayElementList([self]))
+  }
+}

Sources/SwiftSyntaxBuilder/ArrayElementListConvenienceInitializers.swift

@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2022 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+import SwiftSyntax
+
+extension ArrayElementList: ExpressibleAsArrayExpr {
+  public func createArrayExpr() -> ArrayExpr {
+    ArrayExpr(elements: self)
+  }
+}

Sources/SwiftSyntaxBuilder/ResultBuilders.swift.gyb renamed to Sources/SwiftSyntaxBuilder/ResultBuilders.swift.gyb.old

@@ -19,6 +19,6 @@
 //===----------------------------------------------------------------------===//
 
 % quotedSyntaxBaseKinds = map(lambda x: '"%s"' % x, SYNTAX_BASE_KINDS)
-let SyntaxBaseKinds: [String] = [
+let SYNTAX_BASE_KINDS: [String] = [
   ${",\n  ".join(quotedSyntaxBaseKinds)}
 ]

Sources/SwiftSyntaxBuilder/gyb_generated/ResultBuilders.swift renamed to Sources/SwiftSyntaxBuilder/generated/ResultBuilders.swift

@@ -42,7 +42,7 @@ class Node {
 
   /// Returns `True` if this node declares one of the base syntax kinds.
   var isBase: Bool {
-    return SyntaxBaseKinds.contains(syntaxKind)
+    return SYNTAX_BASE_KINDS.contains(syntaxKind)
   }
 
   /// Returns `True` if this node is a subclass of SyntaxCollection.
@@ -94,7 +94,7 @@ class Node {
     self.children = children
     self.baseKind = kind
 
-    if !SyntaxBaseKinds.contains(baseKind) {
+    if !SYNTAX_BASE_KINDS.contains(baseKind) {
       fatalError("unknown base kind '\(baseKind)' for node '\(syntaxKind)'")
     }