Add HackBuilderValues::code()

fixes #69

src/key-value-render/HackBuilderCodeRenderer.php

@@ -0,0 +1,23 @@
+<?hh // strict
+/*
+ *  Copyright (c) 2015, Facebook, Inc.
+ *  All rights reserved.
+ *
+ *  This source code is licensed under the BSD-style license found in the
+ *  LICENSE file in the root directory of this source tree. An additional grant
+ *  of patent rights can be found in the PATENTS file in the same directory.
+ *
+ */
+
+namespace Facebook\HackCodegen;
+
+final class HackBuilderCodeRenderer
+implements IHackBuilderValueRenderer<HackBuilder> {
+
+  final public function render(
+    IHackCodegenConfig $_,
+    HackBuilder $value,
+  ): string {
+    return $value->getCode();
+  }
+}

src/key-value-render/HackBuilderValues.php

@@ -23,6 +23,10 @@ public static function export(): IHackBuilderValueRenderer<mixed> {
     return new HackBuilderValueExportRenderer();
   }
 
+  public static function code(): IHackBuilderValueRenderer<HackBuilder> {
+    return new HackBuilderCodeRenderer();
+  }
+
   public static function valueArray<Tv>(
     IHackBuilderValueRenderer<Tv> $vr,
   ): IHackBuilderValueRenderer<array<Tv>> {

test/HackBuilderTest.php

@@ -65,6 +65,19 @@ public function testDocBlock(): void {
     $this->assertUnchanged($body->getCode(), 'docblock2');
   }
 
+  public function testAsValue(): void {
+    $dict = $this->getHackBuilder()->addValue(
+      dict[
+        'foo' =>
+          $this->getHackBuilder()->addValue('bar', HackBuilderValues::literal()),
+      ],
+      HackBuilderValues::dict(
+        HackBuilderKeys::export(),
+        HackBuilderValues::code(),
+      ),
+    );
+  }
+
   public function testShapeWithUniformRendering(): void {
     $shape = $this
       ->getHackBuilder()