mirror of
https://github.com/rust-lang/rust-analyzer
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99 lines
3.7 KiB
Markdown
99 lines
3.7 KiB
Markdown
# Rust Analyzer
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[](https://travis-ci.org/rust-analyzer/rust-analyzer)
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[](https://ci.appveyor.com/project/matklad/rust-analyzer/branch/master)
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Rust Analyzer is an **experimental** modular compiler frontend for the
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Rust language, which aims to lay a foundation for excellent IDE
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support.
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It doesn't implement much of compiler functionality yet, but the
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white-space preserving Rust parser works, and there are significant
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chunks of overall architecture (indexing, on-demand & lazy
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computation, snapshotable world view) in place. Some basic IDE
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functionality is provided via a language server.
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Work on the Rust Analyzer is sponsored by
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[](https://ferrous-systems.com/)
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## Quick Start
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Rust analyzer builds on Rust >= 1.30.0 (currently in beta) and uses
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the 2018 edition.
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```
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# run tests
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$ cargo test
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# show syntax tree of a Rust file
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$ cargo run --package ra_cli parse < crates/ra_syntax/src/lib.rs
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# show symbols of a Rust file
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$ cargo run --package ra_cli symbols < crates/ra_syntax/src/lib.rs
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```
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To try out the language server, see [these
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instructions](./editors/README.md). Please note that the server is not
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ready for general use yet. If you are looking for a Rust IDE that
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works, use [IntelliJ
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Rust](https://github.com/intellij-rust/intellij-rust) or
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[RLS](https://github.com/rust-lang-nursery/rls). That being said, the
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basic stuff works, and rust analyzer is developed in the rust analyzer
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powered editor.
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## Current Status and Plans
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Rust analyzer aims to fill the same niche as the official [Rust
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Language Server](https://github.com/rust-lang-nursery/rls), but uses a
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significantly different architecture. More details can be found [in
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this
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thread](https://internals.rust-lang.org/t/2019-strategy-for-rustc-and-the-rls/8361),
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but the core issue is that RLS works in the "wait until user stops
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typing, run the build process, save the results of the analysis" mode,
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which arguably is the wrong foundation for IDE.
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Rust Analyzer is a hobby project at the moment, there's exactly zero
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guarantees that it becomes production-ready one day.
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The near/mid term plan is to work independently of the main rustc
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compiler and implement at least simplistic versions of name
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resolution, macro expansion and type inference. The purpose is two
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fold:
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* to quickly bootstrap usable and useful language server: solution
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that covers 80% of Rust code will be useful for IDEs, and will be
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vastly simpler than 100% solution.
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* to understand how the consumer-side of compiler API should look like
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(especially it's on-demand aspects). If you have
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`get_expression_type` function, you can write a ton of purely-IDE
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features on top of it, even if the function is only partially
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correct. Plugin in the precise function afterwards should just make
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IDE features more reliable.
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The long term plan is to merge with the mainline rustc compiler,
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probably around the HIR boundary? That is, use rust analyzer for
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parsing, macro expansion and related bits of name resolution, but
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leave the rest (including type inference and trait selection) to the
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existing rustc.
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## Getting in touch
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We have a Discord server dedicated to compilers and language servers
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implemented in Rust: [https://discord.gg/sx3RQZB](https://discord.gg/sx3RQZB).
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## Contributing
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See [CONTRIBUTING.md](./CONTRIBUTING.md) and [ARCHITECTURE.md](./ARCHITECTURE.md)
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## License
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Rust analyzer is primarily distributed under the terms of both the MIT
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license and the Apache License (Version 2.0).
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See LICENSE-APACHE and LICENSE-MIT for details.
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