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Required Components: pass through all tokens in {} and () syntax (#18578)

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# Objective

#18555 added improved require syntax, but inline structs didn't support
`..Default::default()` syntax (for technical reasons we can't parse the
struct directly, so there is manual logic that missed this case).

## Solution

When a `{}` or `()` section is encountered for a required component,
rather than trying to parse the fields directly, just pass _all_ of the
tokens through. This ensures no tokens are dropped, protects us against
any future syntax changes, and optimizes our parsing logic (as we're
dropping the field parsing logic entirely).
This commit is contained in:
Carter Anderson 2025-03-27 14:20:08 -07:00 committed by François Mockers
parent 3c37eae52e
commit 1a6b480ba2
2 changed files with 14 additions and 10 deletions
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12
crates/bevy_ecs/macros/src/component.rs
View File

@ -9,8 +9,8 @@ use syn::{
punctuated::Punctuated,
spanned::Spanned,
token::{Brace, Comma, Paren},
Data, DataEnum, DataStruct, DeriveInput, Expr, ExprCall, ExprPath, Field, FieldValue, Fields,
Ident, LitStr, Member, Path, Result, Token, Type, Visibility,
Data, DataEnum, DataStruct, DeriveInput, Expr, ExprCall, ExprPath, Field, Fields, Ident,
LitStr, Member, Path, Result, Token, Type, Visibility,
};
pub const EVENT: &str = "event";
@ -603,16 +603,16 @@ impl Parse for Require {
// This is a "value style" named-struct-like require
let content;
braced!(content in input);
let fields = Punctuated::<FieldValue, Token![,]>::parse_terminated(&content)?;
let tokens: TokenStream = quote::quote! (|| #path { #fields }).into();
let content = content.parse::<TokenStream2>()?;
let tokens: TokenStream = quote::quote! (|| #path { #content }).into();
Some(TokenStream2::from(tokens))
} else if input.peek(Paren) {
// This is a "value style" tuple-struct-like require
let content;
parenthesized!(content in input);
let content = content.parse::<TokenStream2>()?;
is_constructor_call = last_segment_is_lower;
let fields = Punctuated::<Expr, Token![,]>::parse_terminated(&content)?;
let tokens: TokenStream = quote::quote! (|| #path (#fields)).into();
let tokens: TokenStream = quote::quote! (|| #path (#content)).into();
Some(TokenStream2::from(tokens))
} else if is_enum {
// if this is an enum, then it is an inline enum component declaration

12
crates/bevy_ecs/src/component.rs
View File

@ -166,7 +166,10 @@ use thiserror::Error;
/// #[derive(Component)]
/// #[require(
/// B(1), // tuple structs
/// C { value: 1 }, // named-field structs
/// C { // named-field structs
/// x: 1,
/// ..Default::default()
/// },
/// D::One, // enum variants
/// E::ONE, // associated consts
/// F::new(1) // constructors
@ -176,9 +179,10 @@ use thiserror::Error;
/// #[derive(Component, PartialEq, Eq, Debug)]
/// struct B(u8);
///
/// #[derive(Component, PartialEq, Eq, Debug)]
/// #[derive(Component, PartialEq, Eq, Debug, Default)]
/// struct C {
/// value: u8
/// x: u8,
/// y: u8,
/// }
///
/// #[derive(Component, PartialEq, Eq, Debug)]
@ -206,7 +210,7 @@ use thiserror::Error;
/// # let mut world = World::default();
/// let id = world.spawn(A).id();
/// assert_eq!(&B(1), world.entity(id).get::<B>().unwrap());
/// assert_eq!(&C { value: 1 }, world.entity(id).get::<C>().unwrap());
/// assert_eq!(&C { x: 1, y: 0 }, world.entity(id).get::<C>().unwrap());
/// assert_eq!(&D::One, world.entity(id).get::<D>().unwrap());
/// assert_eq!(&E(1), world.entity(id).get::<E>().unwrap());
/// assert_eq!(&F(1), world.entity(id).get::<F>().unwrap());