Add ruby-rbs-sys crate: Rust FFI bindings for the RBS parser
#2807
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This establishes the foundation for using RBS functionality from Rust. - Generated FFI bindings via bindgen from RBS C headers - Set up build configuration to link with the RBS library - Added initial tests for basic functionality (constant pool, parser) - Configured workspace structure in rust/Cargo.toml The -sys crate follows Rust conventions for FFI bindings, keeping raw unsafe bindings separate from future safe API wrappers. Future commits will add a separate safe wrapper crate on top of these bindings.
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Description
This PR introduces
ruby-rbs-sys, a Rust crate providing FFI bindings to the RBS C parser. A follow-up PR (#2808) addsruby-rbs, a safe wrapper on top of these bindings.Motivation
Enables Rust-based tooling to parse RBS type signatures, supporting use cases like IDE tooling, language servers, and static analysis tools.
Why Two Crates?
Following the Rust
-syspackage convention, we split the bindings into two crates:ruby-rbs-sys: Low-level FFI bindings generated by bindgen. Exposes the raw C API with no safety guarantees.ruby-rbs: Safe, idiomatic Rust wrapper with proper lifetimes and ergonomic APIs.Consumers should use
ruby-rbsfor a safe API. This pattern is also used by ruby-prism.ruby-rbs-sys Overview
build.rscompiles the C parser source using thecccratebindgenCI
Adds CI configuration to build and test the Rust crates.