Merge branch 'elcuervo-mustang_runtime'

README.md

@@ -11,6 +11,8 @@ ExecJS supports these runtimes:
   embedded within MRI Ruby
 * [therubyrhino](https://github.com/cowboyd/therubyrhino) - Mozilla
   Rhino embedded within JRuby
+* [Mustang](https://github.com/nu7hatch/mustang) - Mustang V8
+  embedded within Ruby
 * [Node.js](http://nodejs.org/)
 * Apple JavaScriptCore - Included with Mac OS X
 * [Mozilla Spidermonkey](http://www.mozilla.org/js/spidermonkey/)

lib/execjs.rb

@@ -6,6 +6,7 @@ module ExecJS
   class ProgramError    < Error; end
 
   autoload :ExternalRuntime,  "execjs/external_runtime"
+  autoload :MustangRuntime,   "execjs/mustang_runtime"
   autoload :RubyRacerRuntime, "execjs/ruby_racer_runtime"
   autoload :RubyRhinoRuntime, "execjs/ruby_rhino_runtime"
   autoload :Runtimes,         "execjs/runtimes"

lib/execjs/mustang_runtime.rb

@@ -0,0 +1,72 @@
+module ExecJS
+  class MustangRuntime
+    class Context
+      def initialize(source = "")
+        @v8_context = ::Mustang::Context.new
+        @v8_context.eval(source)
+      end
+
+      def exec(source, options = {})
+        if /\S/ =~ source
+          eval "(function(){#{source}})()", options
+        end
+      end
+
+      def eval(source, options = {})
+        if /\S/ =~ source
+          unbox @v8_context.eval("(#{source})")
+        end
+      end
+
+      def call(properties, *args)
+        unbox @v8_context.eval(properties).call(*args)
+      rescue NoMethodError => e
+        raise ProgramError, e.message
+      end
+
+      def unbox(value)
+        case value
+        when Mustang::V8::Array
+          value.map { |v| unbox(v) }
+        when Mustang::V8::Boolean
+          value.to_bool
+        when Mustang::V8::NullClass, Mustang::V8::UndefinedClass
+          nil
+        when Mustang::V8::Function
+          nil
+        when Mustang::V8::SyntaxError
+          raise RuntimeError, value.message
+        when Mustang::V8::Error
+          raise ProgramError, value.message
+        else
+          value.respond_to?(:delegate) ? value.delegate : value
+        end
+      end
+    end
+
+    def name
+      "Mustang (V8)"
+    end
+
+    def exec(source)
+      context = Context.new
+      context.exec(source)
+    end
+
+    def eval(source)
+      context = Context.new
+      context.eval(source)
+    end
+
+    def compile(source)
+      Context.new(source)
+    end
+
+    def available?
+      require "mustang"
+      true
+    rescue LoadError
+      false
+    end
+  end
+end

lib/execjs/runtimes.rb

@@ -4,6 +4,8 @@ module ExecJS
 
     RubyRhino = RubyRhinoRuntime.new
 
+    Mustang = MustangRuntime.new
+
     Node = ExternalRuntime.new(
       :name        => "Node.js (V8)",
       :command     => ["nodejs", "node"],
@@ -38,6 +40,7 @@ module ExecJS
       @runtimes ||= [
         RubyRacer,
         RubyRhino,
+        Mustang,
         Node,
         JavaScriptCore,
         Spidermonkey,

test/test_runtimes.rb

@@ -59,6 +59,7 @@ end
 runtimes = [
   "RubyRacer",
   "RubyRhino",
+  "Mustang",
   "Node",
   "JavaScriptCore",
   "Spidermonkey",