Merge pull request #1 from josh/duktape

Duktape

.travis.yml

@@ -8,16 +8,22 @@ matrix:
   include:
     - rvm: 2.0.0
       env: EXECJS_RUNTIME=Node
+    - rvm: 2.0.0
+      env: EXECJS_RUNTIME=Duktape
     - rvm: 2.0.0
       env: EXECJS_RUNTIME=RubyRacer
 
     - rvm: 2.1
       env: EXECJS_RUNTIME=Node
+    - rvm: 2.1
+      env: EXECJS_RUNTIME=Duktape
     - rvm: 2.1
       env: EXECJS_RUNTIME=RubyRacer
 
     - rvm: 2.2
       env: EXECJS_RUNTIME=Node
+    - rvm: 2.2
+      env: EXECJS_RUNTIME=Duktape
     - rvm: 2.2
       env: EXECJS_RUNTIME=RubyRacer
 
@@ -30,5 +36,7 @@ matrix:
       env: EXECJS_RUNTIME=JavaScriptCore
     - os: osx
       env: EXECJS_RUNTIME=Node
+    - os: osx
+      env: EXECJS_RUNTIME=Duktape
     - os: osx
       env: EXECJS_RUNTIME=RubyRacer

Gemfile

@@ -3,6 +3,7 @@ source 'https://rubygems.org'
 gemspec
 
 group :test do
+  gem 'duktape', platform: :mri
   gem 'therubyracer', platform: :mri
   gem 'therubyrhino', ">=1.73.3", platform: :jruby
   gem 'minitest', require: false

lib/execjs/duktape_runtime.rb

@@ -0,0 +1,68 @@
+require "execjs/runtime"
+require "json"
+
+module ExecJS
+  class DuktapeRuntime < Runtime
+    class Context < Runtime::Context
+      def initialize(runtime, source = "")
+        @ctx = Duktape::Context.new(complex_object: nil)
+        @ctx.exec_string(encode(source), '(execjs)')
+      rescue Exception => e
+        raise wrap_error(e)
+      end
+
+      def exec(source, options = {})
+        return unless /\S/ =~ source
+        @ctx.eval_string("(function(){#{encode(source)}})()", '(execjs)')
+      rescue Exception => e
+        raise wrap_error(e)
+      end
+
+      def eval(source, options = {})
+        return unless /\S/ =~ source
+        @ctx.eval_string("(#{encode(source)})", '(execjs)')
+      rescue Exception => e
+        raise wrap_error(e)
+      end
+
+      def call(identifier, *args)
+        @ctx.call_prop(identifier.split("."), *args)
+      rescue Exception => e
+        raise wrap_error(e)
+      end
+
+      private
+        def wrap_error(e)
+          klass = case e
+          when Duktape::SyntaxError
+            RuntimeError
+          when Duktape::Error
+            ProgramError
+          when Duktape::InternalError
+            RuntimeError
+          end
+
+          if klass
+            re = / \(line (\d+)\)$/
+            lineno = e.message[re, 1] || 1
+            error = klass.new(e.message.sub(re, ""))
+            error.set_backtrace(["(execjs):#{lineno}"] + e.backtrace)
+            error
+          else
+            e
+          end
+        end
+    end
+
+    def name
+      "Duktape"
+    end
+
+    def available?
+      require "duktape"
+      true
+    rescue LoadError
+      false
+    end
+  end
+end

lib/execjs/runtimes.rb

@@ -1,5 +1,6 @@
 require "execjs/module"
 require "execjs/disabled_runtime"
+require "execjs/duktape_runtime"
 require "execjs/external_runtime"
 require "execjs/ruby_racer_runtime"
 require "execjs/ruby_rhino_runtime"
@@ -8,6 +9,8 @@ module ExecJS
   module Runtimes
     Disabled = DisabledRuntime.new
 
+    Duktape = DuktapeRuntime.new
+
     RubyRacer = RubyRacerRuntime.new
 
     RubyRhino = RubyRhinoRuntime.new
@@ -70,6 +73,7 @@ module ExecJS
 
     def self.runtimes
       @runtimes ||= [
+        Duktape,
         RubyRacer,
         RubyRhino,
         JavaScriptCore,