I've just added this project grammar onhttps://mingodad.github.io/parsertl-playground/playground/ that is an editor/tester for yacc/lex grammars, selectTDengine SQL parser fromExamples then clickParse to see the parser tree of the sql inInput source.

I hope it'll help document/debug/develop/test the grammar .

For it to work on the online playground I needed to addNK_SEMI that was not defined/used in the grammar and add 2 new rules to allow parse multiple statements.

%start commands%%commands :    command    | commands command    ;command :    NK_SEMI    | cmd    ;

Any feedback is welcome !