Make tests pass with JRuby and reinstate 2.2 compat (#112)

Fixes #99

Rename the `String#encode` argument to `undef:` so that
jRuby becomes compatible again.

Also remove uses of the save navigation operator to restore
compatibility with MRI 2.2, since we can have it so easily

.travis.yml

@@ -1,13 +1,11 @@
 rvm:
+- 2.2.0
 - 2.3.0
 - 2.4.2
 - 2.5.0
 - jruby-9.0
 sudo: false
 cache: bundler
-matrix:
-  allow_failures:
-    - rvm: jruby-9.0
 script:
   - bundle exec rubocop
   - bundle exec rspec

CHANGELOG.md

@@ -1,3 +1,7 @@
+## Unreleased
+* Add support for Ruby 2.2.0
+* Fix support for JRuby 9.0
+
 ## 0.12.0
 * Relay upstream status from `RemoteIO` in the `status_code` attribute (returns an `Integer`)
 
@@ -127,4 +131,4 @@
 ## 0.1.0
 * Add parsers for PNG, JPG, TIFF, PSD
 * Add GIF parser
-* Add DPX parser
+* Add DPX parser

lib/parsers/jpeg_parser.rb

@@ -70,9 +70,9 @@ def scan
         format: :jpg,
         width_px: @width,
         height_px: @height,
-        display_width_px: @exif_data&.rotated? ? @height : @width,
-        display_height_px: @exif_data&.rotated? ? @width : @height,
-        orientation: @exif_data&.orientation,
+        display_width_px: @exif_data && @exif_data.rotated? ? @height : @width,
+        display_height_px: @exif_data && @exif_data.rotated? ? @width : @height,
+        orientation: @exif_data && @exif_data.orientation,
         intrinsics: {exif: @exif_data},
       )
 

lib/parsers/zip_parser.rb

@@ -40,7 +40,7 @@ def directory?(zip_entry)
 
   def decode_filename(filename, likely_unicode:)
     filename.force_encoding(Encoding::UTF_8) if likely_unicode
-    filename.encode(Encoding::UTF_8, undefined: :replace, replace: UNICODE_REPLACEMENT_CHAR)
+    filename.encode(Encoding::UTF_8, undef: :replace, replace: UNICODE_REPLACEMENT_CHAR)
   end
 
   def decode_filename_of(zip_entry)