Feature Request: Configurable "equality" symbol in production rule

[GavinHigham]

Many grammars use different equality symbols to separate the left and right sides of a production rule:
symbol ::= replacement
symbol = replacement
symbol → replacement

If this symbol was configurable, it would make it easier to use these grammars with the tool.

[katef]

I wonder if it would make sense to attempt to provide a "generic" BNF dialect, where this (and #28 and other aspects) are configurable. This might be enough to deal with W3C, lua, the C standard and a few other "casual" dialects.

The only dialects implemented currently are standardised ones - that is, formally specified by a particular standards body. I've resisted adding an add-hoc dialect, because of course everybody writes theirs differently. Details like escapes within strings get difficult. But I can imagine exposing a bunch of settings like this.

Maybe the syntax is fixed, but the lexing is configurable?

[mingodad]

Look here for how this project seems to manage configuration: https://github.com/gotthardp/bnfparser2/tree/master/parser/share/syntax

[mingodad]

Also would be nice if kgt could support the EBNF supported by https://www.bottlecaps.de/rr/ui I did converted several (64) grammars to it here https://github.com/mingodad/plgh and would like to have then been managed by kgt

tree-sitter-abnf.ebnf
tree-sitter-agda.ebnf
tree-sitter-bash.ebnf
tree-sitter-beancount.ebnf
tree-sitter-carp.ebnf
tree-sitter-c.ebnf
tree-sitter-clojure.ebnf
tree-sitter-cpp.ebnf
tree-sitter-c-sharp.ebnf
tree-sitter-css.ebnf
tree-sitter-dart.ebnf
tree-sitter-elm.ebnf
tree-sitter-embedded-template.ebnf
tree-sitter-eno.ebnf
tree-sitter-erlang.ebnf
tree-sitter-fennel.ebnf
tree-sitter-fortran.ebnf
tree-sitter-go.ebnf
tree-sitter-graphql.ebnf
tree-sitter-haskel.ebnf
tree-sitter-html.ebnf
tree-sitter-janet.ebnf
tree-sitter-java.ebnf
tree-sitter-javascript.ebnf
tree-sitter-jsdoc.ebnf
tree-sitter-julia.ebnf
tree-sitter-kotlin.ebnf
tree-sitter-lbnf.ebnf
tree-sitter-lean.ebnf
tree-sitter-ledger.ebnf
tree-sitter-lua.ebnf
tree-sitter-markdown.ebnf
tree-sitter-menhir.ebnf
tree-sitter-minizinc.ebnf
tree-sitter-nim.ebnf
tree-sitter-nix.ebnf
tree-sitter-perl.ebnf
tree-sitter-php.ebnf
tree-sitter-powershell.ebnf
tree-sitter-prolog.ebnf
tree-sitter-python.ebnf
tree-sitter-ql.ebnf
tree-sitter-reason.ebnf
tree-sitter-r.ebnf
tree-sitter-regex.ebnf
tree-sitter-ruby.ebnf
tree-sitter-rust.ebnf
tree-sitter-scala.ebnf
tree-sitter-sexp.ebnf
tree-sitter-sml.ebnf
tree-sitter-sourcepawn.ebnf
tree-sitter-sparql.ebnf
tree-sitter-stan.ebnf
tree-sitter-svelte.ebnf
tree-sitter-swift.ebnf
tree-sitter-systemrdl.ebnf
tree-sitter-teal.ebnf
tree-sitter-toml.ebnf
tree-sitter-turtle.ebnf
tree-sitter-verilog.ebnf
tree-sitter-vhdl.ebnf
tree-sitter-vue.ebnf
tree-sitter-wasm-wast.ebnf
tree-sitter-yaml.ebnf
tree-sitter-zig.ebnf