Add undefined and null literal support

This adds the UndefinedLiteral and NullLiteral to AST.

Fixes #990

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/handlebars/compiler/ast.js b/lib/handlebars/compiler/ast.js
index 45212b3..e5904c6 100644
--- a/lib/handlebars/compiler/ast.js
+++ b/lib/handlebars/compiler/ast.js
@@ -101,6 +101,18 @@ var AST = {
       this.value = bool === 'true';
   },
 
+  UndefinedLiteral: function(locInfo) {
+    this.loc = locInfo;
+    this.type = 'UndefinedLiteral';
+    this.original = this.value = undefined;
+  },
+
+  NullLiteral: function(locInfo) {
+    this.loc = locInfo;
+    this.type = 'NullLiteral';
+    this.original = this.value = null;
+  },
+
   Hash: function(pairs, locInfo) {
     this.loc = locInfo;
     this.type = 'Hash';