Commits on Aug 9, 2021

1. Experiment: Use Rust code directly as the interface definition. …

   This is a fun little something I've been messing around with,
   partly just to learn more about Rust macros and `syn`, and partly
   to see if they could make a good replacement for our current use
   of WebIDL for an interface definition language.
   
   Key ideas:
   
   * Declare the UniFFI component interface using a restricted subset
     of Rust syntax, directly as part of the code that implements the
     Rust side of the component. There is no separate .udl file.
   
   * Use a procedural macro to insert the Rust scaffolding directly
     at crate build time, rather than requiring a separate `build.rs`
     setup to generate and include it.
   
   * When generating the foreign-language bindings, have `uniffi-bindgen`
     parse the Rust source directly in order to find the component
     interface.
   
   This seems to work surprisingly well so far. If we do decide to
   go this route, the code here will need a lot more polish before
   it's ready to land...but it works! And it works in a way that's
   not too conceptually different from what we're currently doing
   with a separate `.udl` file.

   

   rfk committed Aug 9, 2021
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