From 940065e8f5d07c21423d28982f61e13adc60f2fb Mon Sep 17 00:00:00 2001
From: Joshua Peek <josh@joshpeek.com>
Date: Thu, 19 Jan 2012 08:47:40 -0800
Subject: [PATCH] Add disabled runtime

---
 lib/execjs/disabled_runtime.rb | 23 +++++++++++++++++++++++
 lib/execjs/runtimes.rb         |  3 +++
 2 files changed, 26 insertions(+)
 create mode 100644 lib/execjs/disabled_runtime.rb

diff --git a/lib/execjs/disabled_runtime.rb b/lib/execjs/disabled_runtime.rb
new file mode 100644
index 0000000..961dc5b
--- /dev/null
+++ b/lib/execjs/disabled_runtime.rb
@@ -0,0 +1,23 @@
+module ExecJS
+  class DisabledRuntime
+    def name
+      "Disabled"
+    end
+
+    def exec(source)
+      raise Error, "ExecJS disabled"
+    end
+
+    def eval(source)
+      raise Error, "ExecJS disabled"
+    end
+
+    def compile(source)
+      raise Error, "ExecJS disabled"
+    end
+
+    def available?
+      true
+    end
+  end
+end
diff --git a/lib/execjs/runtimes.rb b/lib/execjs/runtimes.rb
index eb0f8c4..cb4d837 100644
--- a/lib/execjs/runtimes.rb
+++ b/lib/execjs/runtimes.rb
@@ -1,4 +1,5 @@
 require "execjs/module"
+require "execjs/disabled_runtime"
 require "execjs/external_runtime"
 require "execjs/johnson_runtime"
 require "execjs/mustang_runtime"
@@ -7,6 +8,8 @@ require "execjs/ruby_rhino_runtime"
 
 module ExecJS
   module Runtimes
+    Disabled = DisabledRuntime.new
+
     RubyRacer = RubyRacerRuntime.new
 
     RubyRhino = RubyRhinoRuntime.new