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This is an LR(1) (more precisely pseudo-LALR,with opt-in GLR) parser generator which outputs grammars that can be used by the Lezer parser.
This package exports both a command-line parser generator tool called lezer-generator and a programming interface.
The grammar format that the tool accepts is documented in the system guide.
See test/cases/ for some simple example grammars, or lezer-javascript for a real grammar.
You can import "lezer-generator/rollup" to get a Rollup plugin that will transform files ending in .grammar or .grammar.terms (a pseudo-source referring to the terms produced by the .grammar file) as part of the rollup build process.
import {lezer} from "lezer-generator/rollup"
export default {
input: "./in.js",
output: {file: "out.js", format: "cjs"},
plugins: [lezer()]
}The code is licensed under an MIT license.