[Ruby] Crash when generating diff with JSON output

[kidlab]

I'm using daff Ruby gem version 1.3.27. Given the sample CSV files:

• t1.csv

id,name
1,Tom
2,Jerry

• t2.csv

id,name
1,Tom A

When trying to generate diff in JSON output with this command:

daff.rb diff \
  ./t1.csv \
  ./t2.csv \
  --context 0 \
  --id "id" \
  --output-format json \
  --index \
  --unordered \
  --output ./diff.json

Then I got this error:

~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:892:in 'Coopy::Coopy#run': NameErrorHaxeException (NameErrorHaxeException)
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:907:in 'Coopy::Coopy#coopyhx'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:1024:in 'Coopy::Coopy.main'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/bin/daff.rb:3:in '<top (required)>'
	from ~/.asdf/installs/ruby/3.4.4/bin/daff.rb:25:in 'Kernel#load'
	from ~/.asdf/installs/ruby/3.4.4/bin/daff.rb:25:in '<main>'
~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/haxe/format/json_printer.rb:164:in 'Haxe::Format::JsonPrinter#fields_string': undefined local variable or method '__php__' for an instance of Haxe::Format::JsonPrinter (NameError)

                v1 = str_pad("",((l - "".length) / c.length).ceil * c.length + "".length,c,__php__.call("STR_PAD_LEFT"))
                                                                                           ^^^^^^^
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/haxe/format/json_printer.rb:32:in 'Haxe::Format::JsonPrinter#write'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/haxe/format/json_printer.rb:232:in 'Haxe::Format::JsonPrinter._print'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:158:in 'Coopy::Coopy#encode_table'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:134:in 'Coopy::Coopy#save_table'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:173:in 'Coopy::Coopy#save_tables'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:303:in 'Coopy::Coopy#run_diff'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:869:in 'Coopy::Coopy#run'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:907:in 'Coopy::Coopy#coopyhx'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/lib/lib/coopy/coopy.rb:1024:in 'Coopy::Coopy.main'
	from ~/.asdf/installs/ruby/3.4.4/lib/ruby/gems/3.4.0/gems/daff-1.3.27/bin/daff.rb:3:in '<top (required)>'
	from ~/.asdf/installs/ruby/3.4.4/bin/daff.rb:25:in 'Kernel#load'
	from ~/.asdf/installs/ruby/3.4.4/bin/daff.rb:25:in '<main>