Any good resources for learning Rust macros?

• rsx

  3 333 10.0 Rust

  Advanced JSX-like templating for Rust

For me the real cool stuff is made possible through proc macros. They take as input a stream of tokens and output a stream of tokens. For example you can use these to make embedded DSLs in rust (example JSX in rust).

• syn

  19 2,667 9.6 Rust

  Parser for Rust source code

Or you can pair them with crates like syn, and quote for quasi-quoting, and then it's easy to make transformations on the AST of Rust input code. A lot of libraries do this for code-generation and hiding away a lot of complexity (example wasm-bindgen).

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• quote

  3 1,219 7.3 Rust

  Rust quasi-quoting

Or you can pair them with crates like syn, and quote for quasi-quoting, and then it's easy to make transformations on the AST of Rust input code. A lot of libraries do this for code-generation and hiding away a lot of complexity (example wasm-bindgen).

• wasm-bindgen

  44 7,270 9.2 Rust

  Facilitating high-level interactions between Wasm modules and JavaScript

  

Or you can pair them with crates like syn, and quote for quasi-quoting, and then it's easy to make transformations on the AST of Rust input code. A lot of libraries do this for code-generation and hiding away a lot of complexity (example wasm-bindgen).

• cargo-expand

  16 2,427 8.6 Rust

  Subcommand to show result of macro expansion

I recommend you play around with some libraries that use proc macros and then use cargo-expand (vscode + rust-analyzer has a feature like this too) to see the generated code from the macro. For example, try looking at the result of expanding wasm-bindgen's basic example code

• proc-macro-workshop

  26 3,787 4.2 Rust

  Learn to write Rust procedural macros  [Rust Latam conference, Montevideo Uruguay, March 2019]

David Tolnay’s procedural Rust workshop: https://github.com/dtolnay/proc-macro-workshop

• case-studies

  11 1,601 3.8 Rust

  Analysis of various tricky Rust code

Also I suggest his case studies repo since you are looking at what is possible: https://github.com/dtolnay/case-studies

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