support raw property on tagged template literals - closes #164

lib/6to5/file.js

@@ -18,7 +18,8 @@ function File(opts) {
   this.ast          = {};
 }
 
-File.declarations = ["extends", "class-props", "slice", "apply-constructor"];
+File.declarations = ["extends", "class-props", "slice", "apply-constructor",
+                     "tagged-template-literal"];
 
 File.normaliseOptions = function (opts) {
   opts = _.cloneDeep(opts || {});

lib/6to5/templates/tagged-template-literal.js

@@ -0,0 +1,4 @@
+(function (strings, raw) {
+  return Object.defineProperties(strings, { raw: { value: raw } });
+});
+

lib/6to5/transformation/transformers/template-literals.js

@@ -1,3 +1,4 @@
+var util = require("../../util");
 var t    = require("../../types");
 var _    = require("lodash");
 
@@ -5,14 +6,22 @@ var buildBinaryExpression = function (left, right) {
   return t.binaryExpression("+", left, right);
 };
 
-exports.TaggedTemplateExpression = function (node) {
+exports.TaggedTemplateExpression = function (node, parent, file) {
   var args = [];
   var quasi = node.quasi;
 
-  var strings = quasi.quasis.map(function (elem) {
+  var strings = [];
-    return t.literal(elem.value.raw);
+  var raw = [];
+
+  _.each(quasi.quasis, function (elem) {
+    strings.push(t.literal(elem.value.cooked));
+    raw.push(t.literal(elem.value.raw));
   });
-  args.push(t.arrayExpression(strings));
+
+  args.push(t.callExpression(file.addDeclaration("tagged-template-literal"), [
+    t.arrayExpression(strings),
+    t.arrayExpression(raw)
+  ]));
 
   _.each(quasi.expressions, function (expr) {
     args.push(expr);

test/fixtures/transformation/template-literals/tag/actual.js

@@ -1 +1 @@
-var foo = bar`a${ 42 }b ${_.foobar()}`;
+var foo = bar`wow\na${ 42 }b ${_.foobar()}`;

test/fixtures/transformation/template-literals/tag/expected.js

@@ -1,3 +1,11 @@
 "use strict";
 
-var foo = bar(["a", "b ", ""], 42, _.foobar());
+var _taggedTemplateLiteral = function (strings, raw) {
+  return Object.defineProperties(strings, {
+    raw: {
+      value: raw
+    }
+  });
+};
+
+var foo = bar(_taggedTemplateLiteral(["wow\na", "b ", ""], ["wow\\na", "b ", ""]), 42, _.foobar());