Support for interpolated declarations in the js parser.

pkg/compiler/lib/src/js/template.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_ast;
 
 class TemplateManager {
   Map<String, Template> expressionTemplates = new Map<String, Template>();
   Map<String, Template> statementTemplates = new Map<String, Template>();
 
@@ skipping 167 matching lines @@
     throw 'Unimplemented InstantiatorGeneratorVisitor for $node';
   }
 
   static RegExp identiferRE = new RegExp(r'^[A-Za-z_$][A-Za-z_$0-9]*$');
 
   static Expression convertStringToVariableUse(String value) {
     assert(identiferRE.hasMatch(value));
     return new VariableUse(value);
   }
 
+  static Expression convertStringToVariableDeclaration(String value) {
+    assert(identiferRE.hasMatch(value));
+    return new VariableDeclaration(value);
+  }
+
   Instantiator visitInterpolatedExpression(InterpolatedExpression node) {
     var nameOrPosition = node.nameOrPosition;
     return (arguments) {
       var value = arguments[nameOrPosition];
       if (value is Expression) return value;
       if (value is String) return convertStringToVariableUse(value);
       error('Interpolated value #$nameOrPosition is not an Expression: $value');
     };
   }
 
+  Instantiator visitInterpolatedDeclaration(InterpolatedDeclaration node) {
+    var nameOrPosition = node.nameOrPosition;
+    return (arguments) {
+      var value = arguments[nameOrPosition];
+      if (value is Declaration) return value;
+      if (value is String) return convertStringToVariableDeclaration(value);
+      error('Interpolated value #$nameOrPosition is not a declaration: $value');
+    };
+  }
+
   Instantiator visitSplayableExpression(Node node) {
     if (node is InterpolatedExpression) {
       var nameOrPosition = node.nameOrPosition;
       return (arguments) {
         var value = arguments[nameOrPosition];
         Expression toExpression(item) {
           if (item is Expression) return item;
           if (item is String) return convertStringToVariableUse(item);
           return error('Interpolated value #$nameOrPosition is not '
               'an Expression or List of Expressions: $value');
@@ skipping 522 matching lines @@
     if (count != before) containsInterpolatedNode.add(node);
     return null;
   }
 
   visitInterpolatedNode(InterpolatedNode node) {
     containsInterpolatedNode.add(node);
     if (node.isNamed) holeNames.add(node.nameOrPosition);
     ++count;
   }
 }