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bevy_reflect: Add ReflectRef/ReflectMut/ReflectOwned convenience casting methods (#15235)

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# Objective

#13320 added convenience methods for casting a `TypeInfo` into its
respective variant:

```rust
let info: &TypeInfo = <Vec<i32> as Typed>::type_info();

// We know `info` contains a `ListInfo`, so we can simply cast it:
let list_info: &ListInfo = info.as_list().unwrap();
```

This is especially helpful when you have already verified a type is a
certain kind via `ReflectRef`, `ReflectMut`, `ReflectOwned`, or
`ReflectKind`.

As mentioned in that PR, though, it would be useful to add similar
convenience methods to those types as well.

## Solution

Added convenience casting methods to `ReflectRef`, `ReflectMut`, and
`ReflectOwned`.

With these methods, I was able to reduce our nesting in certain places
throughout the crate.

Additionally, I took this opportunity to move these types (and
`ReflectKind`) to their own module to help clean up the `reflect`
module.

## Testing

You can test locally by running:

```
cargo test --package bevy_reflect --all-features
```

---

## Showcase

Convenience methods for casting `ReflectRef`, `ReflectMut`, and
`ReflectOwned` into their respective variants has been added! This
allows you to write cleaner code if you already know the kind of your
reflected data:

```rust
// BEFORE
let ReflectRef::List(list) = list.reflect_ref() else {
    panic!("expected list");
};

// AFTER
let list = list.reflect_ref().as_list().unwrap();
```

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: Pablo Reinhardt <126117294+pablo-lua@users.noreply.github.com>
This commit is contained in:
Gino Valente 2024-09-23 09:50:46 -07:00 committed by GitHub
parent f78856b3bd
commit 4d0961cc8a
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
15 changed files with 530 additions and 355 deletions
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10
crates/bevy_asset/src/reflect.rs
View file

@ -249,7 +249,7 @@ mod tests {
use crate::{Asset, AssetApp, AssetPlugin, ReflectAsset, UntypedHandle};
use bevy_app::App;
use bevy_ecs::reflect::AppTypeRegistry;
use bevy_reflect::{Reflect, ReflectMut};
use bevy_reflect::Reflect;
#[derive(Asset, Reflect)]
struct AssetType {
@ -278,13 +278,13 @@ mod tests {
};
let handle = reflect_asset.add(app.world_mut(), &value);
let ReflectMut::Struct(strukt) = reflect_asset
// struct is a reserved keyword, so we can't use it here
let strukt = reflect_asset
.get_mut(app.world_mut(), handle)
.unwrap()
.reflect_mut()
else {
unreachable!();
};
.as_struct()
.unwrap();
strukt
.field_mut("field")
.unwrap()

33
crates/bevy_reflect/src/array.rs
View file

@ -436,23 +436,20 @@ pub fn array_try_apply<A: Array>(
array: &mut A,
reflect: &dyn PartialReflect,
) -> Result<(), ApplyError> {
if let ReflectRef::Array(reflect_array) = reflect.reflect_ref() {
if array.len() != reflect_array.len() {
return Err(ApplyError::DifferentSize {
from_size: reflect_array.len(),
to_size: array.len(),
});
}
for (i, value) in reflect_array.iter().enumerate() {
let v = array.get_mut(i).unwrap();
v.try_apply(value)?;
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: reflect.reflect_kind(),
to_kind: ReflectKind::Array,
let reflect_array = reflect.reflect_ref().as_array()?;
if array.len() != reflect_array.len() {
return Err(ApplyError::DifferentSize {
from_size: reflect_array.len(),
to_size: array.len(),
});
}
for (i, value) in reflect_array.iter().enumerate() {
let v = array.get_mut(i).unwrap();
v.try_apply(value)?;
}
Ok(())
}
@ -507,7 +504,7 @@ pub fn array_debug(dyn_array: &dyn Array, f: &mut Formatter<'_>) -> std::fmt::Re
}
#[cfg(test)]
mod tests {
use crate::{Reflect, ReflectRef};
use crate::Reflect;
#[test]
fn next_index_increment() {
const SIZE: usize = if cfg!(debug_assertions) {
@ -519,9 +516,7 @@ mod tests {
let b = Box::new([(); SIZE]).into_reflect();
let ReflectRef::Array(array) = b.reflect_ref() else {
panic!("Not an array...");
};
let array = b.reflect_ref().as_array().unwrap();
let mut iter = array.iter();
iter.index = SIZE - 1;

77
crates/bevy_reflect/src/enums/dynamic_enum.rs
View file

@ -322,55 +322,50 @@ impl PartialReflect for DynamicEnum {
#[inline]
fn try_apply(&mut self, value: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::Enum(value) = value.reflect_ref() {
if Enum::variant_name(self) == value.variant_name() {
// Same variant -> just update fields
match value.variant_type() {
VariantType::Struct => {
for field in value.iter_fields() {
let name = field.name().unwrap();
if let Some(v) = Enum::field_mut(self, name) {
v.try_apply(field.value())?;
}
let value = value.reflect_ref().as_enum()?;
if Enum::variant_name(self) == value.variant_name() {
// Same variant -> just update fields
match value.variant_type() {
VariantType::Struct => {
for field in value.iter_fields() {
let name = field.name().unwrap();
if let Some(v) = Enum::field_mut(self, name) {
v.try_apply(field.value())?;
}
}
VariantType::Tuple => {
for (index, field) in value.iter_fields().enumerate() {
if let Some(v) = Enum::field_at_mut(self, index) {
v.try_apply(field.value())?;
}
}
}
_ => {}
}
} else {
// New variant -> perform a switch
let dyn_variant = match value.variant_type() {
VariantType::Unit => DynamicVariant::Unit,
VariantType::Tuple => {
let mut dyn_tuple = DynamicTuple::default();
for field in value.iter_fields() {
dyn_tuple.insert_boxed(field.value().clone_value());
VariantType::Tuple => {
for (index, field) in value.iter_fields().enumerate() {
if let Some(v) = Enum::field_at_mut(self, index) {
v.try_apply(field.value())?;
}
DynamicVariant::Tuple(dyn_tuple)
}
VariantType::Struct => {
let mut dyn_struct = DynamicStruct::default();
for field in value.iter_fields() {
dyn_struct
.insert_boxed(field.name().unwrap(), field.value().clone_value());
}
DynamicVariant::Struct(dyn_struct)
}
};
self.set_variant(value.variant_name(), dyn_variant);
}
_ => {}
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: value.reflect_kind(),
to_kind: ReflectKind::Enum,
});
// New variant -> perform a switch
let dyn_variant = match value.variant_type() {
VariantType::Unit => DynamicVariant::Unit,
VariantType::Tuple => {
let mut dyn_tuple = DynamicTuple::default();
for field in value.iter_fields() {
dyn_tuple.insert_boxed(field.value().clone_value());
}
DynamicVariant::Tuple(dyn_tuple)
}
VariantType::Struct => {
let mut dyn_struct = DynamicStruct::default();
for field in value.iter_fields() {
dyn_struct.insert_boxed(field.name().unwrap(), field.value().clone_value());
}
DynamicVariant::Struct(dyn_struct)
}
};
self.set_variant(value.variant_name(), dyn_variant);
}
Ok(())
}

16
crates/bevy_reflect/src/impls/smallvec.rs
View file

@ -194,15 +194,15 @@ where
T::Item: FromReflect + MaybeTyped + TypePath,
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::List(ref_list) = reflect.reflect_ref() {
let mut new_list = Self::with_capacity(ref_list.len());
for field in ref_list.iter() {
new_list.push(<T as SmallArray>::Item::from_reflect(field)?);
}
Some(new_list)
} else {
None
let ref_list = reflect.reflect_ref().as_list().ok()?;
let mut new_list = Self::with_capacity(ref_list.len());
for field in ref_list.iter() {
new_list.push(<T as SmallArray>::Item::from_reflect(field)?);
}
Some(new_list)
}
}

106
crates/bevy_reflect/src/impls/std.rs
View file

@ -544,15 +544,15 @@ macro_rules! impl_reflect_for_veclike {
impl<T: FromReflect + MaybeTyped + TypePath + GetTypeRegistration> FromReflect for $ty {
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::List(ref_list) = reflect.reflect_ref() {
let mut new_list = Self::with_capacity(ref_list.len());
for field in ref_list.iter() {
$push(&mut new_list, T::from_reflect(field)?);
}
Some(new_list)
} else {
None
let ref_list = reflect.reflect_ref().as_list().ok()?;
let mut new_list = Self::with_capacity(ref_list.len());
for field in ref_list.iter() {
$push(&mut new_list, T::from_reflect(field)?);
}
Some(new_list)
}
}
};
@ -792,17 +792,17 @@ macro_rules! impl_reflect_for_hashmap {
S: TypePath + BuildHasher + Default + Send + Sync,
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::Map(ref_map) = reflect.reflect_ref() {
let mut new_map = Self::with_capacity_and_hasher(ref_map.len(), S::default());
for (key, value) in ref_map.iter() {
let new_key = K::from_reflect(key)?;
let new_value = V::from_reflect(value)?;
new_map.insert(new_key, new_value);
}
Some(new_map)
} else {
None
let ref_map = reflect.reflect_ref().as_map().ok()?;
let mut new_map = Self::with_capacity_and_hasher(ref_map.len(), S::default());
for (key, value) in ref_map.iter() {
let new_key = K::from_reflect(key)?;
let new_value = V::from_reflect(value)?;
new_map.insert(new_key, new_value);
}
Some(new_map)
}
}
};
@ -1013,16 +1013,16 @@ macro_rules! impl_reflect_for_hashset {
S: TypePath + BuildHasher + Default + Send + Sync,
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::Set(ref_set) = reflect.reflect_ref() {
let mut new_set = Self::with_capacity_and_hasher(ref_set.len(), S::default());
for value in ref_set.iter() {
let new_value = V::from_reflect(value)?;
new_set.insert(new_value);
}
Some(new_set)
} else {
None
let ref_set = reflect.reflect_ref().as_set().ok()?;
let mut new_set = Self::with_capacity_and_hasher(ref_set.len(), S::default());
for value in ref_set.iter() {
let new_value = V::from_reflect(value)?;
new_set.insert(new_value);
}
Some(new_set)
}
}
};
@ -1251,17 +1251,17 @@ where
V: FromReflect + MaybeTyped + TypePath + GetTypeRegistration,
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::Map(ref_map) = reflect.reflect_ref() {
let mut new_map = Self::new();
for (key, value) in ref_map.iter() {
let new_key = K::from_reflect(key)?;
let new_value = V::from_reflect(value)?;
new_map.insert(new_key, new_value);
}
Some(new_map)
} else {
None
let ref_map = reflect.reflect_ref().as_map().ok()?;
let mut new_map = Self::new();
for (key, value) in ref_map.iter() {
let new_key = K::from_reflect(key)?;
let new_value = V::from_reflect(value)?;
new_map.insert(new_key, new_value);
}
Some(new_map)
}
}
@ -1422,15 +1422,15 @@ impl<T: FromReflect + MaybeTyped + TypePath + GetTypeRegistration, const N: usiz
for [T; N]
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::Array(ref_array) = reflect.reflect_ref() {
let mut temp_vec = Vec::with_capacity(ref_array.len());
for field in ref_array.iter() {
temp_vec.push(T::from_reflect(field)?);
}
temp_vec.try_into().ok()
} else {
None
let ref_array = reflect.reflect_ref().as_array().ok()?;
let mut temp_vec = Vec::with_capacity(ref_array.len());
for field in ref_array.iter() {
temp_vec.push(T::from_reflect(field)?);
}
temp_vec.try_into().ok()
}
}
@ -1795,15 +1795,15 @@ impl<T: FromReflect + MaybeTyped + Clone + TypePath + GetTypeRegistration> FromR
for Cow<'static, [T]>
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::List(ref_list) = reflect.reflect_ref() {
let mut temp_vec = Vec::with_capacity(ref_list.len());
for field in ref_list.iter() {
temp_vec.push(T::from_reflect(field)?);
}
Some(temp_vec.into())
} else {
None
let ref_list = reflect.reflect_ref().as_list().ok()?;
let mut temp_vec = Vec::with_capacity(ref_list.len());
for field in ref_list.iter() {
temp_vec.push(T::from_reflect(field)?);
}
Some(temp_vec.into())
}
}

326
crates/bevy_reflect/src/kind.rs Normal file
View file

@ -0,0 +1,326 @@
#[cfg(feature = "functions")]
use crate::func::Function;
use crate::{Array, Enum, List, Map, PartialReflect, Set, Struct, Tuple, TupleStruct};
use thiserror::Error;
/// A zero-sized enumeration of the "kinds" of a reflected type.
///
/// Each kind corresponds to a specific reflection trait,
/// such as [`Struct`] or [`List`],
/// which itself corresponds to the kind or structure of a type.
///
/// A [`ReflectKind`] is obtained via [`PartialReflect::reflect_kind`],
/// or via [`ReflectRef::kind`],[`ReflectMut::kind`] or [`ReflectOwned::kind`].
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum ReflectKind {
/// A [struct-like] type.
///
/// [struct-like]: Struct
Struct,
/// A [tuple-struct-like] type.
///
/// [tuple-struct-like]: TupleStruct
TupleStruct,
/// A [tuple-like] type.
///
/// [tuple-like]: Tuple
Tuple,
/// A [list-like] type.
///
/// [list-like]: List
List,
/// An [array-like] type.
///
/// [array-like]: Array
Array,
/// A [map-like] type.
///
/// [map-like]: Map
Map,
/// A [set-like] type.
///
/// [set-like]: Set
Set,
/// An [enum-like] type.
///
/// [enum-like]: Enum
Enum,
/// A [function-like] type.
///
/// [function-like]: Function
#[cfg(feature = "functions")]
Function,
/// A value-like type.
///
/// This most often represents a primitive or opaque type,
/// where it is not possible, difficult, or not useful to reflect the type further.
///
/// For example, `u32` and `String` are examples of value-like types.
/// Additionally, any type that derives [`Reflect`] with the `#[reflect_value]` attribute
/// will be considered a value-like type.
///
/// [`Reflect`]: crate::Reflect
Value,
}
impl std::fmt::Display for ReflectKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
ReflectKind::Struct => f.pad("struct"),
ReflectKind::TupleStruct => f.pad("tuple struct"),
ReflectKind::Tuple => f.pad("tuple"),
ReflectKind::List => f.pad("list"),
ReflectKind::Array => f.pad("array"),
ReflectKind::Map => f.pad("map"),
ReflectKind::Set => f.pad("set"),
ReflectKind::Enum => f.pad("enum"),
#[cfg(feature = "functions")]
ReflectKind::Function => f.pad("function"),
ReflectKind::Value => f.pad("value"),
}
}
}
macro_rules! impl_reflect_kind_conversions {
($name:ident$(<$lifetime:lifetime>)?) => {
impl $name$(<$lifetime>)? {
/// Returns the "kind" of this reflected type without any information.
pub fn kind(&self) -> ReflectKind {
match self {
Self::Struct(_) => ReflectKind::Struct,
Self::TupleStruct(_) => ReflectKind::TupleStruct,
Self::Tuple(_) => ReflectKind::Tuple,
Self::List(_) => ReflectKind::List,
Self::Array(_) => ReflectKind::Array,
Self::Map(_) => ReflectKind::Map,
Self::Set(_) => ReflectKind::Set,
Self::Enum(_) => ReflectKind::Enum,
#[cfg(feature = "functions")]
Self::Function(_) => ReflectKind::Function,
Self::Value(_) => ReflectKind::Value,
}
}
}
impl From<$name$(<$lifetime>)?> for ReflectKind {
fn from(value: $name) -> Self {
match value {
$name::Struct(_) => Self::Struct,
$name::TupleStruct(_) => Self::TupleStruct,
$name::Tuple(_) => Self::Tuple,
$name::List(_) => Self::List,
$name::Array(_) => Self::Array,
$name::Map(_) => Self::Map,
$name::Set(_) => Self::Set,
$name::Enum(_) => Self::Enum,
#[cfg(feature = "functions")]
$name::Function(_) => Self::Function,
$name::Value(_) => Self::Value,
}
}
}
};
}
/// Caused when a type was expected to be of a certain [kind], but was not.
///
/// [kind]: ReflectKind
#[derive(Debug, Error)]
#[error("kind mismatch: expected {expected:?}, received {received:?}")]
pub struct ReflectKindMismatchError {
pub expected: ReflectKind,
pub received: ReflectKind,
}
macro_rules! impl_cast_method {
($name:ident : Value => $retval:ty) => {
#[doc = "Attempts a cast to a [`PartialReflect`] trait object."]
#[doc = "\n\nReturns an error if `self` is not the [`Self::Value`] variant."]
pub fn $name(self) -> Result<$retval, ReflectKindMismatchError> {
match self {
Self::Value(value) => Ok(value),
_ => Err(ReflectKindMismatchError {
expected: ReflectKind::Value,
received: self.kind(),
}),
}
}
};
($name:ident : $kind:ident => $retval:ty) => {
#[doc = concat!("Attempts a cast to a [`", stringify!($kind), "`] trait object.")]
#[doc = concat!("\n\nReturns an error if `self` is not the [`Self::", stringify!($kind), "`] variant.")]
pub fn $name(self) -> Result<$retval, ReflectKindMismatchError> {
match self {
Self::$kind(value) => Ok(value),
_ => Err(ReflectKindMismatchError {
expected: ReflectKind::$kind,
received: self.kind(),
}),
}
}
};
}
/// An immutable enumeration of ["kinds"] of a reflected type.
///
/// Each variant contains a trait object with methods specific to a kind of
/// type.
///
/// A [`ReflectRef`] is obtained via [`PartialReflect::reflect_ref`].
///
/// ["kinds"]: ReflectKind
pub enum ReflectRef<'a> {
Struct(&'a dyn Struct),
TupleStruct(&'a dyn TupleStruct),
Tuple(&'a dyn Tuple),
List(&'a dyn List),
Array(&'a dyn Array),
Map(&'a dyn Map),
Set(&'a dyn Set),
Enum(&'a dyn Enum),
#[cfg(feature = "functions")]
Function(&'a dyn Function),
Value(&'a dyn PartialReflect),
}
impl_reflect_kind_conversions!(ReflectRef<'_>);
impl<'a> ReflectRef<'a> {
impl_cast_method!(as_struct: Struct => &'a dyn Struct);
impl_cast_method!(as_tuple_struct: TupleStruct => &'a dyn TupleStruct);
impl_cast_method!(as_tuple: Tuple => &'a dyn Tuple);
impl_cast_method!(as_list: List => &'a dyn List);
impl_cast_method!(as_array: Array => &'a dyn Array);
impl_cast_method!(as_map: Map => &'a dyn Map);
impl_cast_method!(as_set: Set => &'a dyn Set);
impl_cast_method!(as_enum: Enum => &'a dyn Enum);
impl_cast_method!(as_value: Value => &'a dyn PartialReflect);
}
/// A mutable enumeration of ["kinds"] of a reflected type.
///
/// Each variant contains a trait object with methods specific to a kind of
/// type.
///
/// A [`ReflectMut`] is obtained via [`PartialReflect::reflect_mut`].
///
/// ["kinds"]: ReflectKind
pub enum ReflectMut<'a> {
Struct(&'a mut dyn Struct),
TupleStruct(&'a mut dyn TupleStruct),
Tuple(&'a mut dyn Tuple),
List(&'a mut dyn List),
Array(&'a mut dyn Array),
Map(&'a mut dyn Map),
Set(&'a mut dyn Set),
Enum(&'a mut dyn Enum),
#[cfg(feature = "functions")]
Function(&'a mut dyn Function),
Value(&'a mut dyn PartialReflect),
}
impl_reflect_kind_conversions!(ReflectMut<'_>);
impl<'a> ReflectMut<'a> {
impl_cast_method!(as_struct: Struct => &'a mut dyn Struct);
impl_cast_method!(as_tuple_struct: TupleStruct => &'a mut dyn TupleStruct);
impl_cast_method!(as_tuple: Tuple => &'a mut dyn Tuple);
impl_cast_method!(as_list: List => &'a mut dyn List);
impl_cast_method!(as_array: Array => &'a mut dyn Array);
impl_cast_method!(as_map: Map => &'a mut dyn Map);
impl_cast_method!(as_set: Set => &'a mut dyn Set);
impl_cast_method!(as_enum: Enum => &'a mut dyn Enum);
impl_cast_method!(as_value: Value => &'a mut dyn PartialReflect);
}
/// An owned enumeration of ["kinds"] of a reflected type.
///
/// Each variant contains a trait object with methods specific to a kind of
/// type.
///
/// A [`ReflectOwned`] is obtained via [`PartialReflect::reflect_owned`].
///
/// ["kinds"]: ReflectKind
pub enum ReflectOwned {
Struct(Box<dyn Struct>),
TupleStruct(Box<dyn TupleStruct>),
Tuple(Box<dyn Tuple>),
List(Box<dyn List>),
Array(Box<dyn Array>),
Map(Box<dyn Map>),
Set(Box<dyn Set>),
Enum(Box<dyn Enum>),
#[cfg(feature = "functions")]
Function(Box<dyn Function>),
Value(Box<dyn PartialReflect>),
}
impl_reflect_kind_conversions!(ReflectOwned);
impl ReflectOwned {
impl_cast_method!(into_struct: Struct => Box<dyn Struct>);
impl_cast_method!(into_tuple_struct: TupleStruct => Box<dyn TupleStruct>);
impl_cast_method!(into_tuple: Tuple => Box<dyn Tuple>);
impl_cast_method!(into_list: List => Box<dyn List>);
impl_cast_method!(into_array: Array => Box<dyn Array>);
impl_cast_method!(into_map: Map => Box<dyn Map>);
impl_cast_method!(into_set: Set => Box<dyn Set>);
impl_cast_method!(into_enum: Enum => Box<dyn Enum>);
impl_cast_method!(into_value: Value => Box<dyn PartialReflect>);
}
#[cfg(test)]
mod tests {
use super::*;
use std::collections::HashSet;
#[test]
fn should_cast_ref() {
let value = vec![1, 2, 3];
let result = value.reflect_ref().as_list();
assert!(result.is_ok());
let result = value.reflect_ref().as_array();
assert!(matches!(
result,
Err(ReflectKindMismatchError {
expected: ReflectKind::Array,
received: ReflectKind::List
})
));
}
#[test]
fn should_cast_mut() {
let mut value: HashSet<i32> = HashSet::new();
let result = value.reflect_mut().as_set();
assert!(result.is_ok());
let result = value.reflect_mut().as_map();
assert!(matches!(
result,
Err(ReflectKindMismatchError {
expected: ReflectKind::Map,
received: ReflectKind::Set
})
));
}
#[test]
fn should_cast_owned() {
let value = Box::new(Some(123));
let result = value.reflect_owned().into_enum();
assert!(result.is_ok());
let value = Box::new(Some(123));
let result = value.reflect_owned().into_struct();
assert!(matches!(
result,
Err(ReflectKindMismatchError {
expected: ReflectKind::Struct,
received: ReflectKind::Enum
})
));
}
}

11
crates/bevy_reflect/src/lib.rs
View file

@ -156,7 +156,7 @@
//! ```
//! # use bevy_reflect::{PartialReflect, ReflectRef};
//! let my_tuple: Box<dyn PartialReflect> = Box::new((1, 2, 3));
//! let ReflectRef::Tuple(my_tuple) = my_tuple.reflect_ref() else { unreachable!() };
//! let my_tuple = my_tuple.reflect_ref().as_tuple().unwrap();
//! assert_eq!(3, my_tuple.field_len());
//! ```
//!
@ -545,6 +545,7 @@ mod fields;
mod from_reflect;
#[cfg(feature = "functions")]
pub mod func;
mod kind;
mod list;
mod map;
mod path;
@ -603,6 +604,7 @@ pub use array::*;
pub use enums::*;
pub use fields::*;
pub use from_reflect::*;
pub use kind::*;
pub use list::*;
pub use map::*;
pub use path::*;
@ -773,11 +775,8 @@ mod tests {
// nested retrieval
let c = foo.field("c").unwrap();
if let ReflectRef::Struct(value) = c.reflect_ref() {
assert_eq!(*value.get_field::<u32>("x").unwrap(), 1);
} else {
panic!("Expected a struct.");
}
let value = c.reflect_ref().as_struct().unwrap();
assert_eq!(*value.get_field::<u32>("x").unwrap(), 1);
// patch Foo with a dynamic struct
let mut dynamic_struct = DynamicStruct::default();

28
crates/bevy_reflect/src/list.rs
View file

@ -447,22 +447,18 @@ pub fn list_apply<L: List>(a: &mut L, b: &dyn PartialReflect) {
/// applying elements to each other fails.
#[inline]
pub fn list_try_apply<L: List>(a: &mut L, b: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::List(list_value) = b.reflect_ref() {
for (i, value) in list_value.iter().enumerate() {
if i < a.len() {
if let Some(v) = a.get_mut(i) {
v.try_apply(value)?;
}
} else {
List::push(a, value.clone_value());
let list_value = b.reflect_ref().as_list()?;
for (i, value) in list_value.iter().enumerate() {
if i < a.len() {
if let Some(v) = a.get_mut(i) {
v.try_apply(value)?;
}
} else {
List::push(a, value.clone_value());
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: b.reflect_kind(),
to_kind: ReflectKind::List,
});
}
Ok(())
}
@ -523,7 +519,7 @@ pub fn list_debug(dyn_list: &dyn List, f: &mut Formatter<'_>) -> std::fmt::Resul
#[cfg(test)]
mod tests {
use super::DynamicList;
use crate::{Reflect, ReflectRef};
use crate::Reflect;
use std::assert_eq;
#[test]
@ -551,9 +547,7 @@ mod tests {
};
let b = Box::new(vec![(); SIZE]).into_reflect();
let ReflectRef::List(list) = b.reflect_ref() else {
panic!("Not a list...");
};
let list = b.reflect_ref().as_list().unwrap();
let mut iter = list.iter();
iter.index = SIZE - 1;

20
crates/bevy_reflect/src/map.rs
View file

@ -552,20 +552,16 @@ pub fn map_apply<M: Map>(a: &mut M, b: &dyn PartialReflect) {
/// applying elements to each other fails.
#[inline]
pub fn map_try_apply<M: Map>(a: &mut M, b: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::Map(map_value) = b.reflect_ref() {
for (key, b_value) in map_value.iter() {
if let Some(a_value) = a.get_mut(key) {
a_value.try_apply(b_value)?;
} else {
a.insert_boxed(key.clone_value(), b_value.clone_value());
}
let map_value = b.reflect_ref().as_map()?;
for (key, b_value) in map_value.iter() {
if let Some(a_value) = a.get_mut(key) {
a_value.try_apply(b_value)?;
} else {
a.insert_boxed(key.clone_value(), b_value.clone_value());
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: b.reflect_kind(),
to_kind: ReflectKind::Map,
});
}
Ok(())
}

168
crates/bevy_reflect/src/reflect.rs
View file

@ -1,7 +1,8 @@
use crate::{
array_debug, enum_debug, list_debug, map_debug, serde::Serializable, set_debug, struct_debug,
tuple_debug, tuple_struct_debug, Array, DynamicTypePath, DynamicTyped, Enum, List, Map, Set,
Struct, Tuple, TupleStruct, TypeInfo, TypePath, Typed, ValueInfo,
tuple_debug, tuple_struct_debug, DynamicTypePath, DynamicTyped, ReflectKind,
ReflectKindMismatchError, ReflectMut, ReflectOwned, ReflectRef, TypeInfo, TypePath, Typed,
ValueInfo,
};
use std::{
any::{Any, TypeId},
@ -12,110 +13,6 @@ use thiserror::Error;
use crate::utility::NonGenericTypeInfoCell;
macro_rules! impl_reflect_enum {
($name:ident$(<$lifetime:lifetime>)?) => {
impl $name$(<$lifetime>)? {
/// Returns the "kind" of this reflected type without any information.
pub fn kind(&self) -> ReflectKind {
match self {
Self::Struct(_) => ReflectKind::Struct,
Self::TupleStruct(_) => ReflectKind::TupleStruct,
Self::Tuple(_) => ReflectKind::Tuple,
Self::List(_) => ReflectKind::List,
Self::Array(_) => ReflectKind::Array,
Self::Map(_) => ReflectKind::Map,
Self::Set(_) => ReflectKind::Set,
Self::Enum(_) => ReflectKind::Enum,
#[cfg(feature = "functions")]
Self::Function(_) => ReflectKind::Function,
Self::Value(_) => ReflectKind::Value,
}
}
}
impl From<$name$(<$lifetime>)?> for ReflectKind {
fn from(value: $name) -> Self {
match value {
$name::Struct(_) => Self::Struct,
$name::TupleStruct(_) => Self::TupleStruct,
$name::Tuple(_) => Self::Tuple,
$name::List(_) => Self::List,
$name::Array(_) => Self::Array,
$name::Map(_) => Self::Map,
$name::Set(_) => Self::Set,
$name::Enum(_) => Self::Enum,
#[cfg(feature = "functions")]
$name::Function(_) => Self::Function,
$name::Value(_) => Self::Value,
}
}
}
};
}
/// An immutable enumeration of "kinds" of a reflected type.
///
/// Each variant contains a trait object with methods specific to a kind of
/// type.
///
/// A [`ReflectRef`] is obtained via [`PartialReflect::reflect_ref`].
pub enum ReflectRef<'a> {
Struct(&'a dyn Struct),
TupleStruct(&'a dyn TupleStruct),
Tuple(&'a dyn Tuple),
List(&'a dyn List),
Array(&'a dyn Array),
Map(&'a dyn Map),
Set(&'a dyn Set),
Enum(&'a dyn Enum),
#[cfg(feature = "functions")]
Function(&'a dyn crate::func::Function),
Value(&'a dyn PartialReflect),
}
impl_reflect_enum!(ReflectRef<'_>);
/// A mutable enumeration of "kinds" of a reflected type.
///
/// Each variant contains a trait object with methods specific to a kind of
/// type.
///
/// A [`ReflectMut`] is obtained via [`PartialReflect::reflect_mut`].
pub enum ReflectMut<'a> {
Struct(&'a mut dyn Struct),
TupleStruct(&'a mut dyn TupleStruct),
Tuple(&'a mut dyn Tuple),
List(&'a mut dyn List),
Array(&'a mut dyn Array),
Map(&'a mut dyn Map),
Set(&'a mut dyn Set),
Enum(&'a mut dyn Enum),
#[cfg(feature = "functions")]
Function(&'a mut dyn crate::func::Function),
Value(&'a mut dyn PartialReflect),
}
impl_reflect_enum!(ReflectMut<'_>);
/// An owned enumeration of "kinds" of a reflected type.
///
/// Each variant contains a trait object with methods specific to a kind of
/// type.
///
/// A [`ReflectOwned`] is obtained via [`PartialReflect::reflect_owned`].
pub enum ReflectOwned {
Struct(Box<dyn Struct>),
TupleStruct(Box<dyn TupleStruct>),
Tuple(Box<dyn Tuple>),
List(Box<dyn List>),
Array(Box<dyn Array>),
Map(Box<dyn Map>),
Set(Box<dyn Set>),
Enum(Box<dyn Enum>),
#[cfg(feature = "functions")]
Function(Box<dyn crate::func::Function>),
Value(Box<dyn PartialReflect>),
}
impl_reflect_enum!(ReflectOwned);
/// A enumeration of all error outcomes that might happen when running [`try_apply`](PartialReflect::try_apply).
#[derive(Error, Debug)]
pub enum ApplyError {
@ -152,39 +49,11 @@ pub enum ApplyError {
},
}
/// A zero-sized enumeration of the "kinds" of a reflected type.
///
/// A [`ReflectKind`] is obtained via [`PartialReflect::reflect_kind`],
/// or via [`ReflectRef::kind`],[`ReflectMut::kind`] or [`ReflectOwned::kind`].
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
pub enum ReflectKind {
Struct,
TupleStruct,
Tuple,
List,
Array,
Map,
Set,
Enum,
#[cfg(feature = "functions")]
Function,
Value,
}
impl std::fmt::Display for ReflectKind {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
ReflectKind::Struct => f.pad("struct"),
ReflectKind::TupleStruct => f.pad("tuple struct"),
ReflectKind::Tuple => f.pad("tuple"),
ReflectKind::List => f.pad("list"),
ReflectKind::Array => f.pad("array"),
ReflectKind::Map => f.pad("map"),
ReflectKind::Set => f.pad("set"),
ReflectKind::Enum => f.pad("enum"),
#[cfg(feature = "functions")]
ReflectKind::Function => f.pad("function"),
ReflectKind::Value => f.pad("value"),
impl From<ReflectKindMismatchError> for ApplyError {
fn from(value: ReflectKindMismatchError) -> Self {
Self::MismatchedKinds {
from_kind: value.received,
to_kind: value.expected,
}
}
}
@ -202,6 +71,9 @@ impl std::fmt::Display for ReflectKind {
///
/// [`bevy_reflect`]: crate
/// [the derive macro for `Reflect`]: bevy_reflect_derive::Reflect
/// [`Struct`]: crate::Struct
/// [`TupleStruct`]: crate::TupleStruct
/// [`Enum`]: crate::Enum
/// [crate-level documentation]: crate
#[diagnostic::on_unimplemented(
message = "`{Self}` does not implement `PartialReflect` so cannot be introspected",
@ -289,6 +161,13 @@ where
/// [`list_apply`] and [`map_apply`] helper functions when implementing this method.
///
/// [introspection subtrait]: crate#the-introspection-subtraits
/// [`Struct`]: crate::Struct
/// [`TupleStruct`]: crate::TupleStruct
/// [`Tuple`]: crate::Tuple
/// [`Enum`]: crate::Enum
/// [`List`]: crate::List
/// [`Array`]: crate::Array
/// [`Map`]: crate::Map
/// [`list_apply`]: crate::list_apply
/// [`map_apply`]: crate::map_apply
///
@ -344,6 +223,12 @@ where
/// or [`Enum::clone_dynamic`], respectively.
/// Implementors of other `Reflect` subtraits (e.g. [`List`], [`Map`]) should
/// use those subtraits' respective `clone_dynamic` methods.
///
/// [`Struct::clone_dynamic`]: crate::Struct::clone_dynamic
/// [`TupleStruct::clone_dynamic`]: crate::TupleStruct::clone_dynamic
/// [`Enum::clone_dynamic`]: crate::Enum::clone_dynamic
/// [`List`]: crate::List
/// [`Map`]: crate::Map
fn clone_value(&self) -> Box<dyn PartialReflect>;
/// Returns a hash of the value (which includes the type).
@ -366,6 +251,8 @@ where
/// (e.g. [`List`], [`Map`]), will default to the format: `"Reflect(type_path)"`,
/// where `type_path` is the [type path] of the underlying type.
///
/// [`List`]: crate::List
/// [`Map`]: crate::Map
/// [type path]: TypePath::type_path
fn debug(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self.reflect_ref() {
@ -423,6 +310,9 @@ where
///
/// [`bevy_reflect`]: crate
/// [the derive macro]: bevy_reflect_derive::Reflect
/// [`Struct`]: crate::Struct
/// [`TupleStruct`]: crate::TupleStruct
/// [`Enum`]: crate::Enum
/// [`Reflectable`]: crate::Reflectable
/// [crate-level documentation]: crate
#[diagnostic::on_unimplemented(

16
crates/bevy_reflect/src/set.rs
View file

@ -473,18 +473,14 @@ pub fn set_apply<M: Set>(a: &mut M, b: &dyn PartialReflect) {
/// applying elements to each other fails.
#[inline]
pub fn set_try_apply<S: Set>(a: &mut S, b: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::Set(set_value) = b.reflect_ref() {
for b_value in set_value.iter() {
if a.get(b_value).is_none() {
a.insert_boxed(b_value.clone_value());
}
let set_value = b.reflect_ref().as_set()?;
for b_value in set_value.iter() {
if a.get(b_value).is_none() {
a.insert_boxed(b_value.clone_value());
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: b.reflect_kind(),
to_kind: ReflectKind::Set,
});
}
Ok(())
}

18
crates/bevy_reflect/src/struct_trait.rs
View file

@ -406,19 +406,15 @@ impl PartialReflect for DynamicStruct {
}
fn try_apply(&mut self, value: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::Struct(struct_value) = value.reflect_ref() {
for (i, value) in struct_value.iter_fields().enumerate() {
let name = struct_value.name_at(i).unwrap();
if let Some(v) = self.field_mut(name) {
v.try_apply(value)?;
}
let struct_value = value.reflect_ref().as_struct()?;
for (i, value) in struct_value.iter_fields().enumerate() {
let name = struct_value.name_at(i).unwrap();
if let Some(v) = self.field_mut(name) {
v.try_apply(value)?;
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: value.reflect_kind(),
to_kind: ReflectKind::Struct,
});
}
Ok(())
}

34
crates/bevy_reflect/src/tuple.rs
View file

@ -403,18 +403,14 @@ pub fn tuple_apply<T: Tuple>(a: &mut T, b: &dyn PartialReflect) {
/// applying elements to each other fails.
#[inline]
pub fn tuple_try_apply<T: Tuple>(a: &mut T, b: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::Tuple(tuple) = b.reflect_ref() {
for (i, value) in tuple.iter_fields().enumerate() {
if let Some(v) = a.field_mut(i) {
v.try_apply(value)?;
}
let tuple = b.reflect_ref().as_tuple()?;
for (i, value) in tuple.iter_fields().enumerate() {
if let Some(v) = a.field_mut(i) {
v.try_apply(value)?;
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: b.reflect_kind(),
to_kind: ReflectKind::Tuple,
});
}
Ok(())
}
@ -645,17 +641,15 @@ macro_rules! impl_reflect_tuple {
impl<$($name: FromReflect + MaybeTyped + TypePath + GetTypeRegistration),*> FromReflect for ($($name,)*)
{
fn from_reflect(reflect: &dyn PartialReflect) -> Option<Self> {
if let ReflectRef::Tuple(_ref_tuple) = reflect.reflect_ref() {
Some(
(
$(
<$name as FromReflect>::from_reflect(_ref_tuple.field($index)?)?,
)*
)
let _ref_tuple = reflect.reflect_ref().as_tuple().ok()?;
Some(
(
$(
<$name as FromReflect>::from_reflect(_ref_tuple.field($index)?)?,
)*
)
} else {
None
}
)
}
}
}

16
crates/bevy_reflect/src/tuple_struct.rs
View file

@ -314,18 +314,14 @@ impl PartialReflect for DynamicTupleStruct {
}
fn try_apply(&mut self, value: &dyn PartialReflect) -> Result<(), ApplyError> {
if let ReflectRef::TupleStruct(tuple_struct) = value.reflect_ref() {
for (i, value) in tuple_struct.iter_fields().enumerate() {
if let Some(v) = self.field_mut(i) {
v.try_apply(value)?;
}
let tuple_struct = value.reflect_ref().as_tuple_struct()?;
for (i, value) in tuple_struct.iter_fields().enumerate() {
if let Some(v) = self.field_mut(i) {
v.try_apply(value)?;
}
} else {
return Err(ApplyError::MismatchedKinds {
from_kind: value.reflect_kind(),
to_kind: ReflectKind::TupleStruct,
});
}
Ok(())
}

6
examples/reflection/dynamic_types.rs
View file

@ -4,7 +4,7 @@ use bevy::reflect::{
reflect_trait, serde::TypedReflectDeserializer, std_traits::ReflectDefault, DynamicArray,
DynamicEnum, DynamicList, DynamicMap, DynamicSet, DynamicStruct, DynamicTuple,
DynamicTupleStruct, DynamicVariant, FromReflect, PartialReflect, Reflect, ReflectFromReflect,
ReflectRef, Set, TypeRegistry, Typed,
Set, TypeRegistry, Typed,
};
use serde::de::DeserializeSeed;
use std::collections::{HashMap, HashSet};
@ -56,9 +56,7 @@ fn main() {
// This dynamic type is used to represent (or "proxy") the original type,
// so that we can continue to access its fields and overall structure.
let ReflectRef::Struct(cloned_ref) = cloned.reflect_ref() else {
panic!("expected struct")
};
let cloned_ref = cloned.reflect_ref().as_struct().unwrap();
let id = cloned_ref.field("id").unwrap().try_downcast_ref::<u32>();
assert_eq!(id, Some(&123));