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A parser-combinator library for writing PEG-style grammars in Rust with a focus on useful errors, error recovery and good performance.

13 starsRust

Marser, a grammar-first parser combinator library for Rust

Name: Marser, a grammar-first parser combinator library for Rust
Availability: InStock
Author: ArneCode

by ArneCode·Jun 10, 2026·2 points·1 comment

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AI Analysis

●MidNiche GemShip It

TUI debugger is novel, but nom and chumsky already own this space.

Strengths

•TUI for debugging parsers is genuinely unique in the Rust ecosystem
•Grammar-first approach makes parser code resemble EBNF notation
•Zero-copy parsing and packrat caching show performance awareness

Weaknesses

•Parser combinators in Rust are solved (nom, chumsky, pest dominate)
•First library from author with AI-assisted code raises maturity questions

Post Description

Hello everyone!

I am the author of marser, a parser-combinator library in rust.

I have tried outlining the reasons for writing this library in this blog post: https://blog.arnedebo.com/posts/a-grammar-first-approach-to-...

The main aim of the library is to make parsers readable and understandable by enabling users to write code that resembles formal grammars / ebnf (more on that in the blog post). It also has additional features like error recovery, custom error diagnostics and a TUI for debugging the parsers.

This is my first library, so I would really appreciate some feedback on design decisions / usability etc.

Disclaimer: I have used AI for parts of the documentation, for some of the macro code and things like the TUI viewer but the core parsing code has been written by me.