Lady Deirdre 2 – Rust Framework for Compilers and LSP Servers
Greetings! I would like to share with you my project, Lady Deirdre. Lady Deirdre is a framework that helps you create new programming languages in Rust. It is specifically designed to develop compilers and interpreters with support for code editor extensions (LSP servers) from day one. The framework includes essential components to design parsers and semantic analyzers capable of incrementally reparsing dynamically evolving source code. Lady Deirdre can be seen as a replacement for preexisting projects with similar goals, such as Tree-Sitter, Rowan, or Salsa. However, Lady Deirdre aims to…
In plain words
Lady Deirdre is a Rust framework for building programming languages, compilers, and interpreters with built-in support for LSP-based code editor extensions. It provides tools for designing parsers and semantic analyzers that can incrementally reparse evolving source code. The framework offers a unified API covering language development stages, including components for source code formatters, positioning it as an alternative to similar projects like Tree-Sitter, Rowan, and Salsa.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
Greetings! I would like to share with you my project, Lady Deirdre. Lady Deirdre is a framework that helps you create new programming languages in Rust. It is specifically designed to develop compilers and interpreters with support for code editor extensions (LSP servers) from day one. The framework includes essential components to design parsers and semantic analyzers capable of incrementally reparsing dynamically evolving source code. Lady Deirdre can be seen as a replacement for preexisting projects with similar goals, such as Tree-Sitter, Rowan, or Salsa. However, Lady Deirdre aims to offer a unified framework API that guides you through the steps of programming language development, providing even more components necessary to develop a full-featured language ecosystem. For example, components to develop a source code formatter. I will be happy to answer any questions. Ilya
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