Parsec

Parsec is a lightweight, fast, and minimal Language Server Protocol (LSP) implementation for the Julia programming language, written in Rust. It focuses on providing essential editor features with near-instant startup time, without relying on Julia's runtime or heavy compiler infrastructure.

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Why Parsec?

• Fast: Written in Rust, designed for instant startup.
• Minimal: Focused on essential LSP features without heavy semantics.
• Hackable: Easy to extend and customize for personal workflows.
• Self-contained: No Julia runtime dependency.

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Roadmap / TODO

LSP Core

• Set up tower-lsp server with basic request handlers.
• Implement initialize and shutdown requests.
• Add support for textDocument/didOpen and didChange.

Parsing & Diagnostics

• Integrate tree-sitter-julia for incremental parsing.
• Provide syntax diagnostics and error reporting.
• Support textDocument/documentSymbol.

Indexing & Workspace

• Build a per-file symbol index.
• Support cross-file symbol lookup.
• Implement workspace/symbol fuzzily.

Basic Language Features

• Implement simple completion.
• Add basic go to definition using lexical scope heuristics.
• Provide hover information with docstring extraction.

Extras (Optional)

• Add rename support (best-effort, index-based).
• Implement simple formatter integration.
• Consider embedding Julia via jlrs for optional deeper features.

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Status

Work in progress — Parsec is in the early stages of development.
Expect frequent changes and experimental APIs.

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