Rust -> Swift IPC Data Schema Translator
========================================
Eonil

Generates Swift data-types and serialization code for
IPC(inter-process communication) to Rust.

You define data schema in Rust code, and execute this tool to
derive corresponding Swift-side data-types and serializations.
You can perform Rust-side serializaton with `serde`. 
and Swift-side serialization code
will be generated.

Intermediate messages will be coded in JSON.

How to Use
----------
1. Make a root level module named `to_swift`.
2. Define message data types in there.
3. Execute this tool on Cargo workspace root.

An example is included in source tree.



Type Mappings
-------------
Rust to/from Swift.

    std::bool                   <->     Bool
    std::i64                    <->     Int64
    std::f64                    <->     Float64
    std::String                 <->     String
    std::option::Option         <->     Optional
    std::vec::Vec               <->     Array
    (enum)                      <->     (enum)
    (struct)                    <->     (struct)

Any other types will not be supported and code-generator
will fail with an error.

- All fields must be `pub`.
- Generated Swift-side serialization code supports only 
  default `serde` behavior. Any customizations won't work.
  So **DO NOT customize `serde` behavior to make it work
  on Swift side**.
- Only JSON container protocol is supported. Others maybe
  work if you can encode/decode them in Swift-side, but
  haven't been tested.







Goal
----
- Reliability.
- Simplicity.
- Easeness.

Limitations
-----------
- No support for `Box` type. So no recursive data type.
- No support for `HashMap` (or any other associated collection) type.

Non-Goal
--------
- Performance. Make it work first.
- Other container protocol else than JSON.
- Generic `enum` or `struct` types.
- Nested modules. All types will be placed in
  flat namespace in Swift.

Constributions and License
--------------------------
Initial version has been written by Eonil.
This project is licensed under "MIT License".
Any contributions will become same license with 
this project.