Online yacc/lex grammar editor/tester

I'm trying to build an online yacc/lex (LALR(1)) grammar editor/tester to help develop/debug/document grammars the main repository is here https://github.com/mingodad/parsertl-playground and the online playground with several non trivial examples is here https://mingodad.github.io/parsertl-playground/playground/ .

Select a grammar/example from "Examples" select box and then click "Parse" to see a parser tree for the source in "Input source" editor.

It's based on https://github.com/BenHanson/gram_grep and https://github.com/BenHanson/lexertl14 .

Any feedback is welcome !

The grammars available so far (with varying state of correctness):

• Ada parser
• Akwa parser (not working)
• Aliceml parser (partially working)
• Ansi C11 parser (partially working)
• Ansi C18 parser (partially working)
• Ansi C parser
• Antlr4.5 parser
• Bison parser (partially working)
• Blawn parser
• Braille parser (not working)
• C3c parser
• Calculator parser
• Carbon parser (need review of '*')
• Chapel parser
• CocoR parser (partially working)
• Cpp5-v2 parser (not working)
• Cql parser
• Cxx parser (not working)
• Doxygen code scanner torture
• Ecere parser (not working)
• GramGrep parser
• HTML parser
• idl2cpp parser
• Ispc parser
• Java11 parser
• JavascriptCore parser
• Jq parser (partially working)
• Json5 parser
• Json lexer
• Json parser
• LALR parser
• Lark parser
• Lezer parser (partially working)
• LFortran parser (partially working)
• Linden Script parser
• Lox parser
• LPegrex parser (partially working)
• LPython parser (not working)
• Lua2ljs parser
• Lua-5.3 parser
• Lua parser
• LuaPP parser (partially working)
• Minic parser
• Minizinc parser (not working)
• MSTA parser
• Mulang parser (not working)
• Openscad parser (partially working)
• Peg parser (partially working)
• Pikchr parser
• Playground3 parser
• Playground parser
• PnetC parser
• PnetCSHarp parser
• PnetDPas parser
• PnetJava parser
• PnetVBasic parser
• Postgresql parser (be patient)
• Preprocessor parser (not working)
• Rust parser
• Scheme parser
• Souffle parser
• Tameparse parser (not working)
• Textdiagram parser
• Textmapper parser
• Webassembly interpreter parser
• XML parser
• Z80 assembler parser

The issue describes an online grammar editor hosted in the linked parsertl-playground repositories rather than a requested change in racc. Start by reviewing those linked repositories and the listed playground behavior; a suitable contribution would need an explicit integration target and completion criteria for racc, which the issue does not provide.