Remove outdated Encoding workaround

lib/execjs/duktape_runtime.rb

@@ -6,21 +6,21 @@ class DuktapeRuntime < Runtime
     class Context < Runtime::Context
       def initialize(runtime, source = "", options = {})
         @ctx = Duktape::Context.new(complex_object: nil)
-        @ctx.exec_string(encode(source), '(execjs)')
+        @ctx.exec_string(source.encode(Encoding::UTF_8), '(execjs)')
       rescue Exception => e
         raise wrap_error(e)
       end
 
       def exec(source, options = {})
         return unless /\S/ =~ source
-        @ctx.eval_string("(function(){#{encode(source)}})()", '(execjs)')
+        @ctx.eval_string("(function(){#{source.encode(Encoding::UTF_8)}})()", '(execjs)')
       rescue Exception => e
         raise wrap_error(e)
       end
 
       def eval(source, options = {})
         return unless /\S/ =~ source
-        @ctx.eval_string("(#{encode(source)})", '(execjs)')
+        @ctx.eval_string("(#{source.encode(Encoding::UTF_8)})", '(execjs)')
       rescue Exception => e
         raise wrap_error(e)
       end

lib/execjs/external_runtime.rb

@@ -6,7 +6,7 @@ module ExecJS
   class ExternalRuntime < Runtime
     class Context < Runtime::Context
       def initialize(runtime, source = "", options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         @runtime = runtime
         @source  = source
@@ -16,15 +16,15 @@ def initialize(runtime, source = "", options = {})
       end
 
       def eval(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         if /\S/ =~ source
           exec("return eval(#{::JSON.generate("(#{source})", quirks_mode: true)})")
         end
       end
 
       def exec(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
         source = "#{@source}\n#{source}" if @source != ""
         source = @runtime.compile_source(source)
 

lib/execjs/graaljs_runtime.rb

@@ -8,7 +8,7 @@ def initialize(runtime, source = "", options = {})
         @context.eval('js', 'delete this.console')
         @js_object = @context.eval('js', 'Object')
 
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
         unless source.empty?
           translate do
             eval_in_context(source)
@@ -17,7 +17,7 @@ def initialize(runtime, source = "", options = {})
       end
 
       def exec(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
         source = "(function(){#{source}})()" if /\S/.match?(source)
 
         translate do
@@ -26,7 +26,7 @@ def exec(source, options = {})
       end
 
       def eval(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
         source = "(#{source})" if /\S/.match?(source)
 
         translate do
@@ -35,7 +35,7 @@ def eval(source, options = {})
       end
 
       def call(source, *args)
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
         source = "(#{source})" if /\S/.match?(source)
 
         translate do

lib/execjs/mini_racer_runtime.rb

@@ -4,7 +4,7 @@ module ExecJS
   class MiniRacerRuntime < Runtime
     class Context < Runtime::Context
       def initialize(runtime, source = "", options={})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
         @context = ::MiniRacer::Context.new
         @context.eval("delete this.console");
         translate do
@@ -13,15 +13,15 @@ def initialize(runtime, source = "", options={})
       end
 
       def exec(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         if /\S/ =~ source
           eval "(function(){#{source}})()"
         end
       end
 
       def eval(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         if /\S/ =~ source
           translate do

lib/execjs/ruby_rhino_runtime.rb

@@ -5,7 +5,7 @@ module ExecJS
   class RubyRhinoRuntime < Runtime
     class Context < Runtime::Context
       def initialize(runtime, source = "", options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         @rhino_context = ::Rhino::Context.new
         fix_memory_limit! @rhino_context
@@ -15,15 +15,15 @@ def initialize(runtime, source = "", options = {})
       end
 
       def exec(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         if /\S/ =~ source
           eval "(function(){#{source}})()", options
         end
       end
 
       def eval(source, options = {})
-        source = encode(source)
+        source = source.encode(Encoding::UTF_8)
 
         if /\S/ =~ source
           unbox @rhino_context.eval("(#{source})")

lib/execjs/runtime.rb

@@ -1,11 +1,7 @@
-require "execjs/encoding"
-
 module ExecJS
   # Abstract base class for runtimes
   class Runtime
     class Context
-      include Encoding
-
       def initialize(runtime, source = "", options = {})
       end