Add support for Swift 3.0

Tests/StencilTests/ParserSpec.swift

@@ -0,0 +1,62 @@
+import Spectre
+import Stencil
+
+
+func testTokenParser() {
+  describe("TokenParser") {
+    $0.it("can parse a text token") {
+      let parser = TokenParser(tokens: [
+        .text(value: "Hello World")
+      ], namespace: Namespace())
+
+      let nodes = try parser.parse()
+      let node = nodes.first as? TextNode
+
+      try expect(nodes.count) == 1
+      try expect(node?.text) == "Hello World"
+    }
+
+    $0.it("can parse a variable token") {
+      let parser = TokenParser(tokens: [
+        .variable(value: "'name'")
+      ], namespace: Namespace())
+
+      let nodes = try parser.parse()
+      let node = nodes.first as? VariableNode
+      try expect(nodes.count) == 1
+      let result = try node?.render(Context())
+      try expect(result) == "name"
+    }
+
+    $0.it("can parse a comment token") {
+      let parser = TokenParser(tokens: [
+        .comment(value: "Secret stuff!")
+      ], namespace: Namespace())
+
+      let nodes = try parser.parse()
+      try expect(nodes.count) == 0
+    }
+
+    $0.it("can parse a tag token") {
+      let namespace = Namespace()
+      namespace.registerSimpleTag("known") { _ in
+        return ""
+      }
+
+      let parser = TokenParser(tokens: [
+        .block(value: "known"),
+      ], namespace: namespace)
+
+      let nodes = try parser.parse()
+      try expect(nodes.count) == 1
+    }
+
+    $0.it("errors when parsing an unknown tag") {
+      let parser = TokenParser(tokens: [
+        .block(value: "unknown"),
+      ], namespace: Namespace())
+
+      try expect(try parser.parse()).toThrow(TemplateSyntaxError("Unknown template tag 'unknown'"))
+    }
+  }
+}