@lezer/generator

@lezer/generator

[ WEBSITE | ISSUES | FORUM | CHANGELOG ]

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 plugin can be passed lezer({exportName}) option to configure the name of the parser export.

The code is licensed under an MIT license.

Changelog

1.7.2 (2024-12-06)

Bug fixes

Fix an issue where the terms file could contain tokens named eval or arguments, which isn't allowed in strict mode.

The Rollup plugin will now ignore sources starting with null characters in its resolve hook.