Remove 1.8 non-encoding branches

lib/execjs/encoding.rb

@@ -1,7 +1,6 @@
 module ExecJS
   # Encodes strings as UTF-8
   module Encoding
-    if "".respond_to?(:encode)
     if RUBY_ENGINE == 'jruby' || RUBY_ENGINE == 'rbx'
       # workaround for jruby bug http://jira.codehaus.org/browse/JRUBY-6588
       # workaround for rbx bug https://github.com/rubinius/rubinius/issues/1729
@@ -23,11 +22,5 @@ module ExecJS
         string.encode('UTF-8')
       end
     end
-    else
-      # Define no-op on 1.8
-      def encode(string)
-        string
-      end
-    end
   end
 end

lib/execjs/external_runtime.rb

@@ -69,21 +69,11 @@ module ExecJS
           end
         end
 
-        if "".respond_to?(:codepoints)
         def encode_unicode_codepoints(str)
           str.gsub(/[\u0080-\uffff]/) do |ch|
             "\\u%04x" % ch.codepoints.to_a
           end
         end
-        else
-          def encode_unicode_codepoints(str)
-            str.gsub(/([\xC0-\xDF][\x80-\xBF]|
-                       [\xE0-\xEF][\x80-\xBF]{2}|
-                       [\xF0-\xF7][\x80-\xBF]{3})+/nx) do |ch|
-              "\\u%04x" % ch.unpack("U*")
-            end
-          end
-        end
     end
 
     attr_reader :name
@@ -165,7 +155,6 @@ module ExecJS
         end
       end
 
-      if "".respond_to?(:force_encoding)
       def sh(command)
         output, options = nil, {}
         options[:external_encoding] = @encoding if @encoding
@@ -173,20 +162,6 @@ module ExecJS
         IO.popen(command, options) { |f| output = f.read }
         output
       end
-      else
-        require "iconv"
-
-        def sh(command)
-          output = nil
-          IO.popen(command) { |f| output = f.read }
-
-          if @encoding
-            Iconv.new('UTF-8', @encoding).iconv(output)
-          else
-            output
-          end
-        end
-      end
 
       if ExecJS.windows?
         def shell_escape(*args)

lib/execjs/johnson_runtime.rb

@@ -47,9 +47,7 @@ module ExecJS
         when function?(value)
           nil
         when string?(value)
-          value.respond_to?(:force_encoding) ?
+          value.force_encoding('UTF-8')
-            value.force_encoding('UTF-8') :
-            value
         when array?(value)
           value.map { |v| unbox(v) }
         when object?(value)

lib/execjs/ruby_racer_runtime.rb

@@ -64,9 +64,7 @@ module ExecJS
             vs
           end
         when String
-          value.respond_to?(:force_encoding) ?
+          value.force_encoding('UTF-8')
-            value.force_encoding('UTF-8') :
-            value
         else
           value
         end

test/test_execjs.rb

@@ -83,7 +83,6 @@ class TestExecJS < Test::Unit::TestCase
     assert_equal "\\", ExecJS.eval('"\\\\"')
   end
 
-  if defined? Encoding
   def test_encoding
     utf8 = Encoding.find('UTF-8')
 
@@ -119,7 +118,6 @@ class TestExecJS < Test::Unit::TestCase
       context.eval(binary)
     end
   end
-  end
 
   def test_compile
     context = ExecJS.compile("foo = function() { return \"bar\"; }")