This is a Kotlin Multiplatform line-by-line transliteration port of lalrpop/lalrpop.

Original Project: This port is based on lalrpop/lalrpop. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.

This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.

The text below is reproduced and lightly edited from https://github.com/lalrpop/lalrpop. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs so they continue to resolve from this repository.

LALRPOP is a Rust parser generator framework with usability as its primary goal. You should be able to write compact, DRY, readable grammars. To this end, LALRPOP offers a number of nifty features:

0. Nice error messages in case parser constructor fails.
1. Macros that let you extract common parts of your grammar. This means you can go beyond simple repetition like Id* and define things like Comma<Id> for a comma-separated list of identifiers.
2. Macros can also create subsets, so that you easily do something like Expr<"all"> to represent the full range of expressions, but Expr<"if"> to represent the subset of expressions that can appear in an if expression.
3. Builtin support for operators like * and ?.
4. Compact defaults so that you can avoid writing action code much of the time.
5. Type inference so you can often omit the types of nonterminals.

Despite its name, LALRPOP in fact uses LR(1) by default (though you can opt for LALR(1)), and really I hope to eventually move to something general that can handle all CFGs (like GLL, GLR, LL(*), etc).

The LALRPOP book covers all things LALRPOP -- or at least it intends to! Here are some tips:

• The tutorial covers the basics of setting up a LALRPOP parser.
• For the impatient, you may prefer the quick start guide section, which describes how to add LALRPOP to your Cargo.toml.
• Returning users of LALRPOP may benefit from the cheat sheet.
• The advanced setup chapter shows how to configure other aspects of LALRPOP's preprocessing.
• docs.rs API documentation for lalrpop and lalrpop-util
• If you have any questions join our gitter lobby.

• LALRPOP is itself implemented in LALRPOP.
• Gluon is a statically typed functional programming language.
• RustPython is Python 3.5+ rewritten in Rust
• Solang is Ethereum Solidity rewritten in Rust

You really should read CONTRIBUTING.md if you intend to change LALRPOP's own grammar.

dependencies {
    implementation("io.github.kotlinmania:lalrpop-util-kotlin:0.1.1")
}

./gradlew build
./gradlew test

• macOS arm64
• Linux x64
• Windows mingw-x64
• iOS arm64 / simulator-arm64 (Swift export + XCFramework)
• JS (browser + Node.js)
• Wasm-JS (browser + Node.js)
• Android (API 24+)

See AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.

This Kotlin port is distributed under the same Apache-2.0 license as the upstream lalrpop/lalrpop. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.

Original work copyrighted by the lalrpop authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.

Thanks to the lalrpop/lalrpop maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.