Execute repl code in new context

lib/repl.js

@@ -13,14 +13,25 @@
 // repl.start("node > ").scope.foo = "stdin is fun";  // expose foo to repl scope
 
 var sys = require('sys');
+var evalcx = process.binding('evals').Script.runInNewContext;
+var path = require("path");
+var scope;
+
+function setScope (self) {
+  scope = {};
+  for (var i in global) scope[i] = global[i];
+  scope.module = module;
+  scope.require = require;
+}
+
 
 // Can overridden with custom print functions, such as `probe` or `eyes.js`
 exports.writer = sys.inspect;
 
 function REPLServer(prompt, stream) {
   var self = this;
-  
-  self.scope = {};
+  if (!scope) setScope();
+  self.scope = scope;
   self.buffered_cmd = '';
   self.prompt = prompt || "node> ";
   self.stream = stream || process.openStdin();
@@ -61,20 +72,20 @@ REPLServer.prototype.readline = function (cmd) {
     // This try is for determining if the command is complete, or should
     // continue onto the next line.
     try {
-      self.buffered_cmd = self.convertToScope(self.buffered_cmd);
-      
-      // Scope the readline with self.scope to provide "local" vars and make Douglas Crockford cry
-      with (self.scope) {
-        var ret = eval(self.buffered_cmd);
+      // Scope the readline with self.scope
+      // with(){} and eval() are considered bad.
+      var ret = evalcx(self.buffered_cmd, scope, "repl");
       if (ret !== undefined) {
-          self.scope['_'] = ret;
+        scope._ = ret;
         self.stream.write(exports.writer(ret) + "\n");
       }
-      }
 
       self.buffered_cmd = '';
     } catch (e) {
-      if (!(e instanceof SyntaxError)) throw e;
+      // instanceof doesn't work across context switches.
+      if (!(e && e.constructor && e.constructor.name === "SyntaxError")) {
+        throw e;
+      }
     }
   } catch (e) {
     // On error: Print the error and clear the buffer
@@ -107,7 +118,7 @@ REPLServer.prototype.parseREPLKeyword = function (cmd) {
   case ".clear":
     self.stream.write("Clearing Scope...\n");
     self.buffered_cmd = '';
-    self.scope = {};
+    setScope();
     self.displayPrompt();
     return true;
   case ".exit":