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Author SHA1 Message Date
Benedikt Peetz eb7a901d09
refactor(treewide): Rework file structure in `src/macros`
This might be a big diff, but I _hope_ that it does not change much
functionally (hopefully it changes nothing generation specific).

What has changed?
-----------------
- I had to merge the three crates into one, to allow `macros` to impl
  functions on Types defined in `parser`.
- As mentioned in the point above, the conversion function are now
  inherent to the type they convert (i. e. `r#type.to_rust()` instead of
  `type_to_rust(r#type)`).
- The conversion function have been sorted, by what they convert to:
   - `to_rust()` converts a type to be used in rust *host* code.
   - `to_c()` converts a type to be used in c *host* code.
   - `to_auxiliary_c()` converts a type to be used in c *auxiliary*
     code.
- The top-most `generate` method of `TrixyConfig` now returns a
  `FileTree` instead of writing the files directly. The `FileTree` can
  still be materialize with the `materialize` method. But this change
  facilitates moving non-generation focused code out of the `generate`
  method.

What is the difference between _host_ and _auxiliary_ code?
-----------------------------------------------------------
Auxiliary code is always written in the language it is generated for. So
auxiliary code for c would be written in c (or at least in a subset of c),
as it represents c header files.
Host code is always written in rust. This is the code that is
responsible for implementing the actual ffi stuff. In our case these are
the `extern "C"` functions and the types, defined in trixy.
The rust host code is generating the native rust representations of
these types.
2024-03-26 17:35:21 +01:00