Expose AST helpers in public API

1 files changed, 21 insertions, 0 deletions

diff --git a/lib/handlebars/compiler/ast.js b/lib/handlebars/compiler/ast.js
index 3f4639c..113c03e 100644
--- a/lib/handlebars/compiler/ast.js
+++ b/lib/handlebars/compiler/ast.js
@@ -104,6 +104,27 @@ var AST = {
     this.type = 'HashPair';
     this.key = key;
     this.value = value;
+  },
+
+  // Public API used to evaluate derived attributes regarding AST nodes
+  helpers: {
+    // a mustache is definitely a helper if:
+    // * it is an eligible helper, and
+    // * it has at least one parameter or hash segment
+    // TODO: Make these public utility methods
+    helperExpression: function(sexpr) {
+      return !!(sexpr.isHelper || sexpr.params.length || sexpr.hash);
+    },
+
+    scopedId: function(path) {
+      return (/^\.|this\b/).test(path.original);
+    },
+
+    // an ID is simple if it only has one part, and that part is not
+    // `..` or `this`.
+    simpleId: function(path) {
+      return path.parts.length === 1 && !AST.helpers.scopedId(path) && !path.depth;
+    }
   }
 };