From b59168832c9f11317bc57cabb5064c9ca97c4e98 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Thu, 9 Oct 2014 14:35:46 +1100
Subject: [PATCH] support tagged template literals - closes #16

---
 lib/6to5/transformers/template-literals.js      | 16 ++++++++++++++++
 test/fixtures/template-literals/tag/actual.js   |  1 +
 test/fixtures/template-literals/tag/expected.js |  1 +
 3 files changed, 18 insertions(+)
 create mode 100644 test/fixtures/template-literals/tag/actual.js
 create mode 100644 test/fixtures/template-literals/tag/expected.js

diff --git a/lib/6to5/transformers/template-literals.js b/lib/6to5/transformers/template-literals.js
index bd42449c09..20f81f0b00 100644
--- a/lib/6to5/transformers/template-literals.js
+++ b/lib/6to5/transformers/template-literals.js
@@ -5,6 +5,22 @@ var buildBinaryExpression = function (left, right) {
   return b.binaryExpression("+", left, right);
 };
 
+exports.TaggedTemplateExpression = function (node) {
+  var args = [];
+  var quasi = node.quasi;
+
+  var strings = quasi.quasis.map(function (elem) {
+    return b.literal(elem.value.raw);
+  });
+  args.push(b.arrayExpression(strings));
+
+  _.each(quasi.expressions, function (expr) {
+    args.push(expr);
+  });
+
+  return b.callExpression(node.tag, args);
+};
+
 exports.TemplateLiteral = function (node) {
   var nodes = [];
 
diff --git a/test/fixtures/template-literals/tag/actual.js b/test/fixtures/template-literals/tag/actual.js
new file mode 100644
index 0000000000..34a227f571
--- /dev/null
+++ b/test/fixtures/template-literals/tag/actual.js
@@ -0,0 +1 @@
+var foo = bar`a${ 42 }b ${_.foobar()}`;
diff --git a/test/fixtures/template-literals/tag/expected.js b/test/fixtures/template-literals/tag/expected.js
new file mode 100644
index 0000000000..bc8d9342bd
--- /dev/null
+++ b/test/fixtures/template-literals/tag/expected.js
@@ -0,0 +1 @@
+var foo = bar(["a", "b ", ""], 42, _.foobar());