Break compiler and vm logic into separate files.

lib/handlebars/vm.js

@@ -0,0 +1,51 @@
+var Handlebars = require("handlebars");
+
+// BEGIN(BROWSER)
+Handlebars.VM = {
+  programWithDepth: function(fn, helpers, partials, data, $depth) {
+    var args = Array.prototype.slice.call(arguments, 4);
+
+    return function(context, options) {
+      options = options || {};
+
+      options = {
+        helpers: options.helpers || helpers,
+        partials: options.partials || partials,
+        data: options.data || data
+      };
+
+      return fn.apply(this, [context, options].concat(args));
+    };
+  },
+  program: function(fn, helpers, partials, data) {
+    return function(context, options) {
+      options = options || {};
+
+      return fn(context, {
+        helpers: options.helpers || helpers,
+        partials: options.partials || partials,
+        data: options.data || data
+      });
+    };
+  },
+  noop: function() { return ""; },
+  compile: function(string, options) {
+    var ast = Handlebars.parse(string);
+    var environment = new Handlebars.Compiler().compile(ast, options);
+    return new Handlebars.JavaScriptCompiler().compile(environment, options);
+  },
+  invokePartial: function(partial, name, context, helpers, partials) {
+    if(partial === undefined) {
+      throw new Handlebars.Exception("The partial " + name + " could not be found");
+    } else if(partial instanceof Function) {
+      return partial(context, {helpers: helpers, partials: partials});
+    } else {
+      partials[name] = Handlebars.VM.compile(partial);
+      return partials[name](context, {helpers: helpers, partials: partials});
+    }
+  }
+};
+
+Handlebars.compile = Handlebars.VM.compile;
+// END(BROWSER)
+