Add support for @data variables

lib/handlebars/compiler/ast.js

@@ -93,6 +93,11 @@ var Handlebars = require('./base');
     this.isSimple = parts.length === 1 && !this.isScoped && depth === 0;
   };
 
+  Handlebars.AST.DataNode = function(id) {
+    this.type = "DATA";
+    this.id = id;
+  };
+
   Handlebars.AST.StringNode = function(string) {
     this.type = "STRING";
     this.string = string;

lib/handlebars/compiler/compiler.js

@@ -96,7 +96,7 @@ Handlebars.JavaScriptCompiler = function() {};
       this.children[guid] = result;
 
       for(var i=0, l=result.depths.list.length; i<l; i++) {
-        var depth = result.depths.list[i];
+        depth = result.depths.list[i];
 
         if(depth < 2) { continue; }
         else { this.addDepth(depth - 1); }
@@ -210,10 +210,14 @@ Handlebars.JavaScriptCompiler = function() {};
     simpleMustache: function(mustache, program, inverse) {
       var id = mustache.id;
 
-      this.addDepth(id.depth);
-      this.opcode('getContext', id.depth);
+      if (id.type === 'ID') {
+        this.addDepth(id.depth);
+        this.opcode('getContext', id.depth);
+      }
 
-      if (id.parts.length) {
+      if (id.type === 'DATA') {
+        this.opcode('lookupData', id.id);
+      } else if (id.parts.length) {
         this.opcode('lookupOnContext', id.parts[0]);
         for(var i=1, l=id.parts.length; i<l; i++) {
           this.opcode('lookup', id.parts[i]);
@@ -247,6 +251,10 @@ Handlebars.JavaScriptCompiler = function() {};
       }
     },
 
+    DATA: function(data) {
+      this.opcode('lookupData', data.id);
+    },
+
     STRING: function(string) {
       this.opcode('pushString', string.string);
     },
@@ -271,6 +279,7 @@ Handlebars.JavaScriptCompiler = function() {};
     },
 
     addDepth: function(depth) {
+      if(isNaN(depth)) { throw new Error("EWOT"); }
       if(depth === 0) { return; }
 
       if(!this.depths[depth]) {
@@ -646,6 +655,10 @@ Handlebars.JavaScriptCompiler = function() {};
       });
     },
 
+    lookupData: function(id) {
+      this.pushStack(this.nameLookup('data', id, 'data'));
+    },
+
     // [pushStringParam]
     //
     // On stack, before: ...
@@ -831,7 +844,7 @@ Handlebars.JavaScriptCompiler = function() {};
       var programParams = [child.index, child.name, "data"];
 
       for(var i=0, l = depths.length; i<l; i++) {
-        var depth = depths[i];
+        depth = depths[i];
 
         if(depth === 1) { programParams.push("depth0"); }
         else { programParams.push("depth" + (depth - 1)); }

lib/handlebars/compiler/printer.js

@@ -111,6 +111,10 @@ Handlebars.PrintVisitor.prototype.ID = function(id) {
   }
 };
 
+Handlebars.PrintVisitor.prototype.DATA = function(data) {
+  return "@" + data.id;
+};
+
 Handlebars.PrintVisitor.prototype.content = function(content) {
   return this.pad("CONTENT[ '" + content.string + "' ]");
 };