plgh

Language support protocol for ide/editor (aka pigments[1]/treesitter[2] bnf for emacs, neovim, zed, etc) Because of the similarity to swift language, perhaps hazel[3] option to highlight differences between standard swift & swift-like language. ----- [1] Pygments, generic syntax highligher : https://news.ycombinator.com/item?id=41324901 [2] Treesitter : https://news.ycombinator.com/item?id=39408195 / https://github.com/mingodad/plgh [3] : Hazel: A live functional programming environment featuring typed holes : https://news.ycombinator.com/item?id=42004133 ~

I've added more non trivial grammars Javascript, Java, Kotlin, PHP, C, CPP, Rust, Ruby, CSS, HTML, Python using a quickjs script to convert "src/grammar.json" to an EBNF understood by https://mingodad.github.io/lua-wasm-playground/ (the script is here https://github.com/mingodad/plgh/blob/main/json2ebnf-lua.js).

It's not true "the best chance you have is reading the 14 thousand-line parse.y file and trying to understand it", there are several tools to navigate yacc/bnf style grammars like https://www.bottlecaps.de/convert/ and it's companion https://www.bottlecaps.de/convert/ that make relatively easy to understand/document/debug/compare the grammar. Just added several ruby grammars here https://github.com/mingodad/plgh/tree/main/ruby they are converted (mainly using https://www.bottlecaps.de/convert/) to an EBNF understood by https://bottlecaps.de/rr/ui to generate navigable railroad diagrams. Copy and paste the EBNF on https://www.bottlecaps.de/rr/ui on the tab "Edit Grammar" the click on the tab "View Diagram" to see/download a navigable railroad diagram.