fix(parser): handle empty strings

2014-11-25 18:38:28 -08:00
parent 6f889e3094
commit a3d9f0fead
3 changed files with 19 additions and 2 deletions
--- a/modules/change_detection/src/parser/ast.js
+++ b/modules/change_detection/src/parser/ast.js
@ -18,6 +18,16 @@ export class AST {
  }
 }

+export class EmptyExpr extends AST {
+  eval(context) {
+    return null;
+  }
+
+  visit(visitor, args) {
+    //do nothing
+  }
+}
+
 export class ImplicitReceiver extends AST {
  eval(context) {
    return context;