List literals in polymer_expressions

pkg/polymer_expressions/lib/expression.dart

Index: pkg/polymer_expressions/lib/expression.dart
diff --git a/pkg/polymer_expressions/lib/expression.dart b/pkg/polymer_expressions/lib/expression.dart
index 5a69ab05891db0e655869bcf7e0295d76520746c..54adfd7579bc7c2a7730309996b63786f1de26b2 100644
--- a/pkg/polymer_expressions/lib/expression.dart
+++ b/pkg/polymer_expressions/lib/expression.dart
@@ -10,6 +10,7 @@ import 'visitor.dart';
 
 EmptyExpression empty() => const EmptyExpression();
 Literal literal(v) => new Literal(v);
+ListLiteral listLiteral(List<Expression> items) => new ListLiteral(items);
 MapLiteral mapLiteral(List<MapLiteralEntry> entries) => new MapLiteral(entries);
 MapLiteralEntry mapLiteralEntry(Literal key, Expression value) =>
     new MapLiteralEntry(key, value);
@@ -85,6 +86,20 @@ class Literal<T> extends Expression {
   int get hashCode => value.hashCode;
 }
 
+class ListLiteral extends Expression {
+  final List<Expression> items;
+
+  ListLiteral(this.items);
+
+  accept(Visitor v) => v.visitListLiteral(this);
+
+  String toString() => "$items";
+
+  bool operator ==(o) => o is ListLiteral && _listEquals(o.items, items);
+
+  int get hashCode => _hashList(items);
+}
+
 class MapLiteral extends Expression {
   final List<MapLiteralEntry> entries;