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# Objective The code in `bevy_reflect_derive` could use some cleanup. ## Solution Took some of the changes in #11659 to create a dedicated PR for cleaning up the field and container attribute logic. #### Updated Naming I renamed `ReflectTraits` and `ReflectFieldAttr` to `ContainerAttributes` and `FieldAttributes`, respectively. I think these are clearer. #### Updated Parsing ##### Readability The parsing logic wasn't too bad before, but it was getting difficult to read. There was some duplicated logic between `Meta::List` and `Meta::Path` attributes. Additionally, all the logic was kept inside a large method. To simply things, I replaced the nested meta parsing with `ParseStream` parsing. In my opinion, this is easier to follow since it breaks up the large match statement into a small set of single-line if statements, where each if-block contains a single call to the appropriate attribute parsing method. ##### Flexibility On top of the added simplicity, this also makes our attribute parsing much more flexible. It allows us to more elegantly handle custom where clauses (i.e. `#[reflect(where T: Foo)]`) and it opens the door for more non-standard attribute syntax (e.g. #11659). ##### Errors This also allows us to automatically provide certain errors when parsing. For example, since we can use `stream.lookahead1()`, we get errors like the following for free: ``` error: expected one of: `ignore`, `skip_serializing`, `default` --> crates/bevy_reflect/src/lib.rs:1988:23 | 1988 | #[reflect(foo)] | ^^^ ``` --- ## Changelog > [!note] > All changes are internal to `bevy_reflect_derive` and should not affect the public API[^1]. - Renamed `ReflectTraits` to `ContainerAttributes` - Renamed `ReflectMeta::traits` to `ReflectMeta::attrs` - Renamed `ReflectFieldAttr` to `FieldAttributes` - Updated parsing logic for field/container attribute parsing - Now uses a `ParseStream` directly instead of nested meta parsing - General code cleanup of the field/container attribute modules for `bevy_reflect_derive` [^1]: Does not include errors, which may look slightly different. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com> |
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Compile fail tests for bevy_reflect
This crate is separate from bevy_reflect and not part of the Bevy workspace in order to not fail crater tests for
Bevy.
The tests assert on the exact compiler errors and can easily fail for new Rust versions due to updated compiler errors (e.g. changes in spans).
The CI workflow executes these tests on the stable rust toolchain (see tools/ci).