feat(variable): Allow Swift type introspection

Tests/StencilTests/StencilSpec.swift

@@ -2,16 +2,23 @@ import Spectre
 import Stencil
 
 
-class CustomNode : NodeType {
+fileprivate class CustomNode : NodeType {
   func render(_ context:Context) throws -> String {
     return "Hello World"
   }
 }
 
 
+fileprivate struct Article {
+  let title: String
+  let author: String
+}
+
+
 func testStencil() {
   describe("Stencil") {
     $0.it("can render the README example") {
+
       let templateString = "There are {{ articles.count }} articles.\n" +
         "\n" +
         "{% for article in articles %}" +
@@ -20,8 +27,8 @@ func testStencil() {
 
       let context = Context(dictionary: [
         "articles": [
-          [ "title": "Migrating from OCUnit to XCTest", "author": "Kyle Fuller" ],
-          [ "title": "Memory Management with ARC", "author": "Kyle Fuller" ],
+          Article(title: "Migrating from OCUnit to XCTest", author: "Kyle Fuller"),
+          Article(title: "Memory Management with ARC", author: "Kyle Fuller"),
         ]
       ])
 

Tests/StencilTests/VariableSpec.swift

@@ -9,6 +9,14 @@ import Stencil
 }
 #endif
 
+fileprivate struct Person {
+  let name: String
+}
+
+fileprivate struct Article {
+  let author: Person
+}
+
 
 func testVariable() {
   describe("Variable") {
@@ -18,6 +26,7 @@ func testVariable() {
       "profiles": [
         "github": "kylef",
       ],
+      "article": Article(author: Person(name: "Kyle"))
     ])
 
 #if os(OSX)
@@ -80,6 +89,12 @@ func testVariable() {
       try expect(result) == "Carlton"
     }
 
+    $0.it("can resolve a property with reflection") {
+      let variable = Variable("article.author.name")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "Kyle"
+    }
+
 #if os(OSX)
     $0.it("can resolve a value via KVO") {
       let variable = Variable("object.title")