therubyracer gem is no longer maintained and is incompatible with Ruby 3.0

.travis.yml

@@ -16,8 +16,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - rvm: 2.0.0
       env: EXECJS_RUNTIME=Duktape
-    - rvm: 2.0.0
-      env: EXECJS_RUNTIME=RubyRacer
     - rvm: 2.0.0
       env: EXECJS_RUNTIME=MiniRacer
       dist: trusty
@@ -27,8 +25,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - rvm: 2.1.10
       env: EXECJS_RUNTIME=Duktape
-    - rvm: 2.1.10
-      env: EXECJS_RUNTIME=RubyRacer
     - rvm: 2.1.10
       env: EXECJS_RUNTIME=MiniRacer
       dist: trusty
@@ -38,8 +34,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - rvm: 2.2.7
       env: EXECJS_RUNTIME=Duktape
-    - rvm: 2.2.7
-      env: EXECJS_RUNTIME=RubyRacer
     - rvm: 2.2.7
       env: EXECJS_RUNTIME=MiniRacer
       dist: trusty
@@ -49,8 +43,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - rvm: 2.3.4
       env: EXECJS_RUNTIME=Duktape
-    - rvm: 2.3.4
-      env: EXECJS_RUNTIME=RubyRacer
     - rvm: 2.3.4
       env: EXECJS_RUNTIME=MiniRacer
       dist: trusty
@@ -60,8 +52,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - rvm: 2.4.1
       env: EXECJS_RUNTIME=Duktape
-    - rvm: 2.4.1
-      env: EXECJS_RUNTIME=RubyRacer
     - rvm: 2.4.1
       env: EXECJS_RUNTIME=MiniRacer
       dist: trusty
@@ -71,8 +61,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - rvm: ruby-head
       env: EXECJS_RUNTIME=Duktape
-    - rvm: ruby-head
-      env: EXECJS_RUNTIME=RubyRacer
     - rvm: ruby-head
       env: EXECJS_RUNTIME=MiniRacer
       dist: trusty
@@ -89,8 +77,6 @@ matrix:
       env: EXECJS_RUNTIME=Node
     - os: osx
       env: EXECJS_RUNTIME=Duktape
-    - os: osx
-      env: EXECJS_RUNTIME=RubyRacer
     - os: osx
       env: EXECJS_RUNTIME=V8
     - os: osx

Gemfile

@@ -4,11 +4,7 @@ gemspec
 
 group :test do
   gem 'duktape', platform: :mri
-  if ENV['EXECJS_RUNTIME'] == 'MiniRacer'
-     gem 'mini_racer', '0.1.0.beta.3', platform: :mri
-  else
-     gem 'therubyracer', platform: :mri
-  end
+  gem 'mini_racer', platform: :mri
   gem 'therubyrhino', '>=1.73.3', platform: :jruby
   gem 'minitest', require: false
 end

README.md

@@ -7,8 +7,6 @@ returns the result to you as a Ruby object.
 
 ExecJS supports these runtimes:
 
-* [therubyracer](https://github.com/cowboyd/therubyracer) - Google V8
-  embedded within Ruby
 * [therubyrhino](https://github.com/cowboyd/therubyrhino) - Mozilla
   Rhino embedded within JRuby
 * [Duktape.rb](https://github.com/judofyr/duktape.rb) - Duktape JavaScript interpreter

lib/execjs/ruby_racer_runtime.rb

@@ -1,114 +0,0 @@
-require "execjs/runtime"
-
-module ExecJS
-  class RubyRacerRuntime < Runtime
-    class Context < Runtime::Context
-      def initialize(runtime, source = "", options = {})
-        source = encode(source)
-
-        lock do
-          @v8_context = ::V8::Context.new
-
-          begin
-            @v8_context.eval(source)
-          rescue ::V8::JSError => e
-            raise wrap_error(e)
-          end
-        end
-      end
-
-      def exec(source, options = {})
-        source = encode(source)
-
-        if /\S/ =~ source
-          eval "(function(){#{source}})()", options
-        end
-      end
-
-      def eval(source, options = {})
-        source = encode(source)
-
-        if /\S/ =~ source
-          lock do
-            begin
-              unbox @v8_context.eval("(#{source})")
-            rescue ::V8::JSError => e
-              raise wrap_error(e)
-            end
-          end
-        end
-      end
-
-      def call(properties, *args)
-        lock do
-          begin
-            unbox @v8_context.eval("(#{properties})").call(*args)
-          rescue ::V8::JSError => e
-            raise wrap_error(e)
-          end
-        end
-      end
-
-      def unbox(value)
-        case value
-        when ::V8::Function
-          nil
-        when ::V8::Array
-          value.map { |v| unbox(v) }
-        when ::V8::Object
-          value.inject({}) do |vs, (k, v)|
-            vs[k] = unbox(v) unless v.is_a?(::V8::Function)
-            vs
-          end
-        when String
-          value.force_encoding('UTF-8')
-        else
-          value
-        end
-      end
-
-      private
-        def lock
-          result, exception = nil, nil
-          V8::C::Locker() do
-            begin
-              result = yield
-            rescue Exception => e
-              exception = e
-            end
-          end
-
-          if exception
-            raise exception
-          else
-            result
-          end
-        end
-
-        def wrap_error(e)
-          error_class = e.value["name"] == "SyntaxError" ? RuntimeError : ProgramError
-
-          stack = e.value["stack"] || ""
-          stack = stack.split("\n")
-          stack.shift
-          stack = [e.message[/<eval>:\d+:\d+/, 0]].compact if stack.empty?
-          stack = stack.map { |line| line.sub(" at ", "").sub("<eval>", "(execjs)").strip }
-
-          error = error_class.new(e.value.to_s)
-          error.set_backtrace(stack + caller)
-          error
-        end
-    end
-
-    def name
-      "therubyracer (V8)"
-    end
-
-    def available?
-      require "v8"
-      true
-    rescue LoadError
-      false
-    end
-  end
-end

lib/execjs/runtimes.rb

@@ -2,7 +2,6 @@ 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"
 require "execjs/mini_racer_runtime"
 
@@ -12,8 +11,6 @@ module ExecJS
 
     Duktape = DuktapeRuntime.new
 
-    RubyRacer = RubyRacerRuntime.new
-
     RubyRhino = RubyRhinoRuntime.new
 
     MiniRacer = MiniRacerRuntime.new
@@ -81,7 +78,6 @@ module ExecJS
 
     def self.runtimes
       @runtimes ||= [
-        RubyRacer,
         RubyRhino,
         Duktape,
         MiniRacer,