Add decorator parsing

lib/handlebars/compiler/helpers.js

@@ -84,8 +84,9 @@ export function prepareMustache(path, params, hash, open, strip, locInfo) {
   let escapeFlag = open.charAt(3) || open.charAt(2),
       escaped = escapeFlag !== '{' && escapeFlag !== '&';
 
+  let decorator = (/\*/.test(open));
   return {
-    type: 'MustacheStatement',
+    type: decorator ? 'Decorator' : 'MustacheStatement',
     path,
     params,
     hash,
@@ -124,12 +125,18 @@ export function prepareBlock(openBlock, program, inverseAndProgram, close, inver
     validateClose(openBlock, close);
   }
 
+  let decorator = (/\*/.test(openBlock.open));
+
   program.blockParams = openBlock.blockParams;
 
   let inverse,
       inverseStrip;
 
   if (inverseAndProgram) {
+    if (decorator) {
+      throw new Exception('Unexpected inverse block on decorator', inverseAndProgram);
+    }
+
     if (inverseAndProgram.chain) {
       inverseAndProgram.program.body[0].closeStrip = close.strip;
     }
@@ -145,7 +152,7 @@ export function prepareBlock(openBlock, program, inverseAndProgram, close, inver
   }
 
   return {
-    type: 'BlockStatement',
+    type: decorator ? 'DecoratorBlock' : 'BlockStatement',
     path: openBlock.path,
     params: openBlock.params,
     hash: openBlock.hash,