Pass All testdata of the official monorepo

[Ajwah]

This implementation fails to parse some of the testdata of the official monorepo.
For instance, when I try to parse complex_background.feature, I get:

** (RuntimeError) Unexpected line: Examples:
    (gherkin 2.0.0) lib/gherkin/parsers/rule_parser.ex:43: Gherkin.Parsers.RuleParser.build_rule/2
    (gherkin 2.0.0) lib/gherkin/parsers/feature_parser.ex:51: Gherkin.Parsers.FeatureParser.build_feature/2
    (elixir 1.10.1) lib/enum.ex:1396: Enum."-map/2-lists^map/1-0-"/2

[revati]

Yes im aware. i have started full rewrite based on official testdata. There is many inconsitancies in current implementation, largest being multilanguage.
But sadly my health has declined over few last months, so i have not had time to put needed time into it :|

[Ajwah]

But sadly my health has declined over few last months

I am sad to hear that :(

I recently have implemented a gherkin parser. How feasible would it be to retrofit for Cabbage? If the current implementation of cabbage-ex/gherkin parses out an AST, then it would be a matter of converting my AST to yours. I have an example here where I am converting my AST to the ndjson format of the official repo to compare to the ndjson-files generated by the official repo, such as these ones