Add ripper encoding/end_seen?

Ripper documentation is broken (only shows methods defined in ruby), these are public API.

Author: Earlopain

lib/prism/translation/ripper.rb

@@ -648,6 +648,16 @@ def parse
         end
       end
 
+      # Return encoding of the source.
+      def encoding
+        result.source.encoding
+      end
+
+      # Return true if parsed source ended by `__END__`.
+      def end_seen?
+        !!result.data_loc
+      end
+
       ##########################################################################
       # Visitor methods
       ##########################################################################

test/prism/ruby/ripper_test.rb

@@ -230,6 +230,28 @@ def test_encoding
       assert_equal(Ripper.sexp(source), Translation::Ripper.sexp(source))
     end
 
+    def test_encoding_method
+      source = "foo"
+      assert_equal(Ripper.new(source).tap(&:parse).encoding, Prism::Translation::Ripper.new(source).tap(&:parse).encoding)
+
+      source = "foo".b
+      assert_equal(Ripper.new(source).tap(&:parse).encoding, Prism::Translation::Ripper.new(source).tap(&:parse).encoding)
+
+      source = "# encoding: shift_jis"
+      assert_equal(Ripper.new(source).tap(&:parse).encoding, Prism::Translation::Ripper.new(source).tap(&:parse).encoding)
+
+      source = "# encoding: shift_jis".b
+      assert_equal(Ripper.new(source).tap(&:parse).encoding, Prism::Translation::Ripper.new(source).tap(&:parse).encoding)
+    end
+
+    def test_end_seen
+      source = ""
+      assert_equal(Ripper.new(source).tap(&:parse).end_seen?, Prism::Translation::Ripper.new(source).tap(&:parse).end_seen?)
+
+      source = "__END__"
+      assert_equal(Ripper.new(source).tap(&:parse).end_seen?, Prism::Translation::Ripper.new(source).tap(&:parse).end_seen?)
+    end
+
     def test_sexp_coercion
       string_like = Object.new
       def string_like.to_str