Support running on truffleruby & jruby

Author: segiddins

.github/workflows/main.yml

@@ -19,6 +19,8 @@ jobs:
           - "3.2.3"
           - "3.1.4"
           - "3.0.5"
+          - "truffleruby-23.1.2"
+          - "jruby-9.4.2.0"
 
     steps:
       - uses: actions/checkout@v4

.rubocop.yml

@@ -17,6 +17,9 @@ Style/StringLiteralsInInterpolation:
   Enabled: true
   EnforcedStyle: double_quotes
 
+Style/EndlessMethod:
+  EnforcedStyle: disallow # truffleruby does not support endless method syntax on 23.x
+
 Layout/LineLength:
   Max: 120
 

lib/protobug/binary_encoding.rb

@@ -22,7 +22,18 @@ def encode_varint(value, outbuf)
           break
         end
       end
-      out.pack("c*", buffer: outbuf)
+      pack(out, "c*", buffer: outbuf)
+    end
+
+    if RUBY_ENGINE == "truffleruby"
+      # see https://github.com/oracle/truffleruby/issues/3559
+      def pack(ary, format, buffer:)
+        buffer.concat ary.pack(format)
+      end
+    else
+      def pack(ary, format, buffer:)
+        ary.pack(format, buffer: buffer)
+      end
     end
 
     def encode_zigzag(size, value, outbuf)