Gino Valente 9e30aa7c92 bevy_reflect_derive: Clean up attribute logic (#11777) ... # 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>		2024-02-12 15:16:27 +00:00
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reflect_derive	bevy_reflect_derive: Clean up attribute logic (#11777)	2024-02-12 15:16:27 +00:00
reflect_derive.rs	bevy_reflect: Add compile fail tests for bevy_reflect (#7041)	2023-01-02 21:07:33 +00:00