Add V8 runtime

lib/execjs.rb

@@ -15,6 +15,6 @@ module ExecJS
   end
 
   def self.runtime
-    @runtime ||= Runtimes::Node.new
+    @runtime ||= Runtimes.runtime
   end
 end

lib/execjs/runtimes.rb

@@ -1,5 +1,10 @@
 module ExecJS
   module Runtimes
     autoload :Node, "execjs/runtimes/node"
+    autoload :V8,   "execjs/runtimes/v8"
+
+    def self.runtime
+      V8.new
+    end
   end
 end

lib/execjs/runtimes/v8.js

@@ -0,0 +1,18 @@
+(function(program, execJS) { execJS(program) })(function() { #{source}
+}, function(program) {
+  var output;
+  try {
+    result = program();
+    if (typeof result == 'undefined' && result !== null) {
+      print('["ok"]');
+    } else {
+      try {
+        print(JSON.stringify(['ok', result]));
+      } catch (err) {
+        print('["err"]');
+      }
+    }
+  } catch (err) {
+    print(JSON.stringify(['err', '' + err]));
+  }
+});

lib/execjs/runtimes/v8.rb

@@ -0,0 +1,13 @@
+module ExecJS
+  module Runtimes
+    class V8 < Runtime
+      def command(filename)
+        "v8 #{filename}"
+      end
+
+      def runner_path
+        File.expand_path('../v8.js', __FILE__)
+      end
+    end
+  end
+end

readme.md

@@ -9,8 +9,8 @@ ExecJS supports these runtimes:
 
 * [therubyracer](https://github.com/cowboyd/therubyracer) - Google V8
   embedded within Ruby for exceptional performance
-* [Node.js](http://nodejs.org/)
 * [Google V8](http://code.google.com/p/v8/)
+* [Node.js](http://nodejs.org/)
 * Apple JavaScriptCore
 * [Mozilla Spidermonkey](http://www.mozilla.org/js/spidermonkey/)
 * [Mozilla Rhino](http://www.mozilla.org/rhino/)

test/test_runtime.rb

@@ -1,11 +1,7 @@
 require "execjs"
 require "test/unit"
 
-class TestNodeRuntime < Test::Unit::TestCase
-  def setup
-    @runtime = ExecJS::Runtimes::Node.new
-  end
-
+module TestRuntime
   def test_exec
     assert_nil @runtime.exec("1")
     assert_nil @runtime.exec("return")
@@ -42,3 +38,19 @@ class TestNodeRuntime < Test::Unit::TestCase
     end
   end
 end
+
+class TestNodeRuntime < Test::Unit::TestCase
+  include TestRuntime
+
+  def setup
+    @runtime = ExecJS::Runtimes::Node.new
+  end
+end
+
+class TestV8Runtime < Test::Unit::TestCase
+  include TestRuntime
+
+  def setup
+    @runtime = ExecJS::Runtimes::V8.new
+  end
+end