Implement ES6 Template Literals

src/harmony-templates.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+'use strict';
+
+function GetTemplateCallSite(cookedStrings, rawStrings) {

[arv (Not doing code reviews), 2014/11/07 16:55:50]

Eventually I think we need to pass in some kind of ID (a hash that is computed
at parse time). If we did that we could keep a Map in this file with the cache.

+  // TODO(caitp): ensure same template callsite is used for subsequent tag calls
+  var count = cookedStrings.length;
+  var siteObj = new $Array(count);
+  var rawObj = new $Array(count);
+
+  var index = 0;
+  for (; index < count; ++index) {
+    var cookedValue = cookedStrings[index];
+    DefineArrayProperty(siteObj, ToString(index), ToPropertyDescriptor({
+      value: cookedValue,
+      configurable: false,
+      writable: false,
+      enumerable: true
+    }), false);
+    var rawValue = rawStrings[index];
+    DefineArrayProperty(rawObj, ToString(index), ToPropertyDescriptor({
+      value: rawValue,
+      configurable: false,
+      writable: false,
+      enumerable: true
+    }), false);
+  }
+
+  DefineObjectProperty(siteObj, "raw", ToPropertyDescriptor({
+    value: %ObjectFreeze(rawObj),
+    configurable: false,
+    writable: false,
+    enumerable: false
+  }), false);
+
+  return %ObjectFreeze(siteObj);
+}