From e41e078159e3eb5907e53f54234ee3e1aed21bb1 Mon Sep 17 00:00:00 2001
From: Brian White <mscdex@mscdex.net>
Date: Fri, 3 Dec 2010 07:45:00 -0500
Subject: [PATCH] Make sure REPL doesn't get borked when invalid REPL keywords
 are entered

---
 lib/repl.js | 68 ++++++++++++++++++++++++++++++-----------------------
 1 file changed, 38 insertions(+), 30 deletions(-)

diff --git a/lib/repl.js b/lib/repl.js
index fb08593b29..d5b55f2027 100644
--- a/lib/repl.js
+++ b/lib/repl.js
@@ -84,6 +84,7 @@ function REPLServer(prompt, stream) {
   });
 
   rli.addListener('line', function(cmd) {
+    var skipCatchall = false;
     cmd = trimWhitespace(cmd);
 
     // Check to see if a REPL keyword was used. If it returns true,
@@ -92,43 +93,50 @@ function REPLServer(prompt, stream) {
       var matches = cmd.match(/^(\.[^\s]+)\s*(.*)$/);
       var keyword = matches && matches[1];
       var rest = matches && matches[2];
-      if (self.parseREPLKeyword(keyword, rest) === true) return;
+      if (self.parseREPLKeyword(keyword, rest) === true) {
+        return;
+      } else {
+        self.stream.write('Invalid REPL keyword\n');
+        skipCatchall = true;
+      }
     }
 
-    // The catchall for errors
-    try {
-      self.buffered_cmd += cmd;
-      // This try is for determining if the command is complete, or should
-      // continue onto the next line.
+    if (!skipCatchall) {
+      // The catchall for errors
       try {
-        // Use evalcx to supply the global context
-        var ret = evalcx(self.buffered_cmd, context, 'repl');
-        if (ret !== undefined) {
-          context._ = ret;
-          self.stream.write(exports.writer(ret) + '\n');
-        }
+        self.buffered_cmd += cmd;
+        // This try is for determining if the command is complete, or should
+        // continue onto the next line.
+        try {
+          // Use evalcx to supply the global context
+          var ret = evalcx(self.buffered_cmd, context, 'repl');
+          if (ret !== undefined) {
+            context._ = ret;
+            self.stream.write(exports.writer(ret) + '\n');
+          }
 
-        self.buffered_cmd = '';
+          self.buffered_cmd = '';
+        } catch (e) {
+          // instanceof doesn't work across context switches.
+          if (!(e && e.constructor && e.constructor.name === 'SyntaxError')) {
+            throw e;
+          // It could also be an error from JSON.parse
+          } else if (e &&
+                     e.stack &&
+                     e.stack.match('Unexpected token ILLEGAL') &&
+                     e.stack.match(/Object.parse \(native\)/)) {
+            throw e;
+          }
+        }
       } catch (e) {
-        // instanceof doesn't work across context switches.
-        if (!(e && e.constructor && e.constructor.name === 'SyntaxError')) {
-          throw e;
-        // It could also be an error from JSON.parse
-        } else if (e &&
-                   e.stack &&
-                   e.stack.match('Unexpected token ILLEGAL') &&
-                   e.stack.match(/Object.parse \(native\)/)) {
-          throw e;
+        // On error: Print the error and clear the buffer
+        if (e.stack) {
+          self.stream.write(e.stack + '\n');
+        } else {
+          self.stream.write(e.toString() + '\n');
         }
+        self.buffered_cmd = '';
       }
-    } catch (e) {
-      // On error: Print the error and clear the buffer
-      if (e.stack) {
-        self.stream.write(e.stack + '\n');
-      } else {
-        self.stream.write(e.toString() + '\n');
-      }
-      self.buffered_cmd = '';
     }
 
     self.displayPrompt();