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bevy/crates/bevy_reflect/src/lib.rs
davier 55402bdf2e
Fix debug printing for dynamic types (#10740) 
# Objective

Printing `DynamicStruct` with a debug format does not show the contained
type anymore. For instance, in `examples/reflection/reflection.rs`,
adding `dbg!(&reflect_value);` to line 96 will print:
```rust
[examples/reflection/reflection.rs:96] &reflect_value = DynamicStruct(bevy_reflect::DynamicStruct {
    a: 4,
    nested: DynamicStruct(bevy_reflect::DynamicStruct {
        b: 8,
    }),
})
```

## Solution

Show the represented type instead (`reflection::Foo` and
`reflection::Bar` in this case):
```rust
[examples/reflection/reflection.rs:96] &reflect_value = DynamicStruct(reflection::Foo {
    a: 4,
    nested: DynamicStruct(reflection::Bar {
        b: 8,
    }),
})
```

---------

Co-authored-by: Gino Valente <49806985+MrGVSV@users.noreply.github.com>
2023-12-12 19:44:43 +00:00

2160 lines
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//! Reflection in Rust.
//!
//! [Reflection] is a powerful tool provided within many programming languages
//! that allows for meta-programming: using information _about_ the program to
//! _affect_ the program.
//! In other words, reflection allows us to inspect the program itself, its
//! syntax, and its type information at runtime.
//!
//! This crate adds this missing reflection functionality to Rust.
//! Though it was made with the [Bevy] game engine in mind,
//! it's a general-purpose solution that can be used in any Rust project.
//!
//! At a very high level, this crate allows you to:
//! * Dynamically interact with Rust values
//! * Access type metadata at runtime
//! * Serialize and deserialize (i.e. save and load) data
//!
//! It's important to note that because of missing features in Rust,
//! there are some [limitations] with this crate.
//!
//! # The `Reflect` Trait
//!
//! At the core of [`bevy_reflect`] is the [`Reflect`] trait.
//!
//! One of its primary purposes is to allow all implementors to be passed around
//! as a `dyn Reflect` trait object.
//! This allows any such type to be operated upon completely dynamically (at a small [runtime cost]).
//!
//! Implementing the trait is easily done using the provided [derive macro]:
//!
//! ```
//! # use bevy_reflect::Reflect;
//! #[derive(Reflect)]
//! struct MyStruct {
//! foo: i32
//! }
//! ```
//!
//! This will automatically generate the implementation of `Reflect` for any struct or enum.
//!
//! It will also generate other very important trait implementations used for reflection:
//! * [`GetTypeRegistration`]
//! * [`Typed`]
//! * [`Struct`], [`TupleStruct`], or [`Enum`] depending on the type
//!
//! ## Requirements
//!
//! We can implement `Reflect` on any type that satisfies _both_ of the following conditions:
//! * The type implements `Any`.
//! This is true if and only if the type itself has a [`'static` lifetime].
//! * All fields and sub-elements themselves implement `Reflect`
//! (see the [derive macro documentation] for details on how to ignore certain fields when deriving).
//!
//! Additionally, using the derive macro on enums requires a third condition to be met:
//! * All fields and sub-elements must implement [`FromReflect`]—
//! another important reflection trait discussed in a later section.
//!
//! # The `Reflect` Subtraits
//!
//! Since [`Reflect`] is meant to cover any and every type, this crate also comes with a few
//! more traits to accompany `Reflect` and provide more specific interactions.
//! We refer to these traits as the _reflection subtraits_ since they all have `Reflect` as a supertrait.
//! The current list of reflection subtraits include:
//! * [`Tuple`]
//! * [`Array`]
//! * [`List`]
//! * [`Map`]
//! * [`Struct`]
//! * [`TupleStruct`]
//! * [`Enum`]
//!
//! As mentioned previously, the last three are automatically implemented by the [derive macro].
//!
//! Each of these traits come with their own methods specific to their respective category.
//! For example, we can access our struct's fields by name using the [`Struct::field`] method.
//!
//! ```
//! # use bevy_reflect::{Reflect, Struct};
//! # #[derive(Reflect)]
//! # struct MyStruct {
//! # foo: i32
//! # }
//! let my_struct: Box<dyn Struct> = Box::new(MyStruct {
//! foo: 123
//! });
//! let foo: &dyn Reflect = my_struct.field("foo").unwrap();
//! assert_eq!(Some(&123), foo.downcast_ref::<i32>());
//! ```
//!
//! Since most data is passed around as `dyn Reflect`,
//! the `Reflect` trait has methods for going to and from these subtraits.
//!
//! [`Reflect::reflect_ref`], [`Reflect::reflect_mut`], and [`Reflect::reflect_owned`] all return
//! an enum that respectively contains immutable, mutable, and owned access to the type as a subtrait object.
//!
//! For example, we can get out a `dyn Tuple` from our reflected tuple type using one of these methods.
//!
//! ```
//! # use bevy_reflect::{Reflect, ReflectRef};
//! let my_tuple: Box<dyn Reflect> = Box::new((1, 2, 3));
//! let ReflectRef::Tuple(my_tuple) = my_tuple.reflect_ref() else { unreachable!() };
//! assert_eq!(3, my_tuple.field_len());
//! ```
//!
//! And to go back to a general-purpose `dyn Reflect`,
//! we can just use the matching [`Reflect::as_reflect`], [`Reflect::as_reflect_mut`],
//! or [`Reflect::into_reflect`] methods.
//!
//! ## Value Types
//!
//! Types that do not fall under one of the above subtraits,
//! such as for primitives (e.g. `bool`, `usize`, etc.)
//! and simple types (e.g. `String`, `Duration`),
//! are referred to as _value_ types
//! since methods like [`Reflect::reflect_ref`] return a [`ReflectRef::Value`] variant.
//! While most other types contain their own `dyn Reflect` fields and data,
//! these types generally cannot be broken down any further.
//!
//! # Dynamic Types
//!
//! Each subtrait comes with a corresponding _dynamic_ type.
//!
//! The available dynamic types are:
//! * [`DynamicTuple`]
//! * [`DynamicArray`]
//! * [`DynamicList`]
//! * [`DynamicMap`]
//! * [`DynamicStruct`]
//! * [`DynamicTupleStruct`]
//! * [`DynamicEnum`]
//!
//! These dynamic types may contain any arbitrary reflected data.
//!
//! ```
//! # use bevy_reflect::{DynamicStruct, Struct};
//! let mut data = DynamicStruct::default();
//! data.insert("foo", 123_i32);
//! assert_eq!(Some(&123), data.field("foo").unwrap().downcast_ref::<i32>())
//! ```
//!
//! They are most commonly used as "proxies" for other types,
//! where they contain the same data as— and therefore, represent— a concrete type.
//! The [`Reflect::clone_value`] method will return a dynamic type for all non-value types,
//! allowing all types to essentially be "cloned".
//! And since dynamic types themselves implement [`Reflect`],
//! we may pass them around just like any other reflected type.
//!
//! ```
//! # use bevy_reflect::{DynamicStruct, Reflect};
//! # #[derive(Reflect)]
//! # struct MyStruct {
//! # foo: i32
//! # }
//! let original: Box<dyn Reflect> = Box::new(MyStruct {
//! foo: 123
//! });
//!
//! // `cloned` will be a `DynamicStruct` representing a `MyStruct`
//! let cloned: Box<dyn Reflect> = original.clone_value();
//! assert!(cloned.represents::<MyStruct>());
//! assert!(cloned.is::<DynamicStruct>());
//! ```
//!
//! ## Patching
//!
//! These dynamic types come in handy when needing to apply multiple changes to another type.
//! This is known as "patching" and is done using the [`Reflect::apply`] method.
//!
//! ```
//! # use bevy_reflect::{DynamicEnum, Reflect};
//! let mut value = Some(123_i32);
//! let patch = DynamicEnum::new("None", ());
//! value.apply(&patch);
//! assert_eq!(None, value);
//! ```
//!
//! ## `FromReflect`
//!
//! It's important to remember that dynamic types are _not_ the concrete type they may be representing.
//! A common mistake is to treat them like such when trying to cast back to the original type
//! or when trying to make use of a reflected trait which expects the actual type.
//!
//! ```should_panic
//! # use bevy_reflect::{DynamicStruct, Reflect};
//! # #[derive(Reflect)]
//! # struct MyStruct {
//! # foo: i32
//! # }
//! let original: Box<dyn Reflect> = Box::new(MyStruct {
//! foo: 123
//! });
//!
//! let cloned: Box<dyn Reflect> = original.clone_value();
//! let value = cloned.take::<MyStruct>().unwrap(); // PANIC!
//! ```
//!
//! To resolve this issue, we'll need to convert the dynamic type to the concrete one.
//! This is where [`FromReflect`] comes in.
//!
//! `FromReflect` is a trait that allows an instance of a type to be generated from a
//! dynamic representation— even partial ones.
//! And since the [`FromReflect::from_reflect`] method takes the data by reference,
//! this can be used to effectively clone data (to an extent).
//!
//! It is automatically implemented when [deriving `Reflect`] on a type unless opted out of
//! using `#[reflect(from_reflect = false)]` on the item.
//!
//! ```
//! # use bevy_reflect::{Reflect, FromReflect};
//! #[derive(Reflect)]
//! struct MyStruct {
//! foo: i32
//! }
//! let original: Box<dyn Reflect> = Box::new(MyStruct {
//! foo: 123
//! });
//!
//! let cloned: Box<dyn Reflect> = original.clone_value();
//! let value = <MyStruct as FromReflect>::from_reflect(&*cloned).unwrap(); // OK!
//! ```
//!
//! When deriving, all active fields and sub-elements must also implement `FromReflect`.
//!
//! Fields can be given default values for when a field is missing in the passed value or even ignored.
//! Ignored fields must either implement [`Default`] or have a default function specified
//! using `#[reflect(default = "path::to::function")]`.
//!
//! See the [derive macro documentation](derive@crate::FromReflect) for details.
//!
//! All primitives and simple types implement `FromReflect` by relying on their [`Default`] implementation.
//!
//! # Path navigation
//!
//! The [`GetPath`] trait allows accessing arbitrary nested fields of a [`Reflect`] type.
//!
//! Using `GetPath`, it is possible to use a path string to access a specific field
//! of a reflected type.
//!
//! ```
//! # use bevy_reflect::{Reflect, GetPath};
//! #[derive(Reflect)]
//! struct MyStruct {
//! value: Vec<Option<u32>>
//! }
//!
//! let my_struct = MyStruct {
//! value: vec![None, None, Some(123)],
//! };
//! assert_eq!(
//! my_struct.path::<u32>(".value[2].0").unwrap(),
//! &123,
//! );
//! ```
//!
//! # Type Registration
//!
//! This crate also comes with a [`TypeRegistry`] that can be used to store and retrieve additional type metadata at runtime,
//! such as helper types and trait implementations.
//!
//! The [derive macro] for [`Reflect`] also generates an implementation of the [`GetTypeRegistration`] trait,
//! which is used by the registry to generate a [`TypeRegistration`] struct for that type.
//! We can then register additional [type data] we want associated with that type.
//!
//! For example, we can register [`ReflectDefault`] on our type so that its `Default` implementation
//! may be used dynamically.
//!
//! ```
//! # use bevy_reflect::{Reflect, TypeRegistry, prelude::ReflectDefault};
//! #[derive(Reflect, Default)]
//! struct MyStruct {
//! foo: i32
//! }
//! let mut registry = TypeRegistry::empty();
//! registry.register::<MyStruct>();
//! registry.register_type_data::<MyStruct, ReflectDefault>();
//!
//! let registration = registry.get(std::any::TypeId::of::<MyStruct>()).unwrap();
//! let reflect_default = registration.data::<ReflectDefault>().unwrap();
//!
//! let new_value: Box<dyn Reflect> = reflect_default.default();
//! assert!(new_value.is::<MyStruct>());
//! ```
//!
//! Because this operation is so common, the derive macro actually has a shorthand for it.
//! By using the `#[reflect(Trait)]` attribute, the derive macro will automatically register a matching,
//! in-scope `ReflectTrait` type within the `GetTypeRegistration` implementation.
//!
//! ```
//! use bevy_reflect::prelude::{Reflect, ReflectDefault};
//!
//! #[derive(Reflect, Default)]
//! #[reflect(Default)]
//! struct MyStruct {
//! foo: i32
//! }
//! ```
//!
//! ## Reflecting Traits
//!
//! Type data doesn't have to be tied to a trait, but it's often extremely useful to create trait type data.
//! These allow traits to be used directly on a `dyn Reflect` while utilizing the underlying type's implementation.
//!
//! For any [object-safe] trait, we can easily generate a corresponding `ReflectTrait` type for our trait
//! using the [`#[reflect_trait]`](reflect_trait) macro.
//!
//! ```
//! # use bevy_reflect::{Reflect, reflect_trait, TypeRegistry};
//! #[reflect_trait] // Generates a `ReflectMyTrait` type
//! pub trait MyTrait {}
//! impl<T: Reflect> MyTrait for T {}
//!
//! let mut registry = TypeRegistry::new();
//! registry.register_type_data::<i32, ReflectMyTrait>();
//! ```
//!
//! The generated type data can be used to convert a valid `dyn Reflect` into a `dyn MyTrait`.
//! See the [trait reflection example](https://github.com/bevyengine/bevy/blob/latest/examples/reflection/trait_reflection.rs)
//! for more information and usage details.
//!
//! # Serialization
//!
//! By using reflection, we are also able to get serialization capabilities for free.
//! In fact, using [`bevy_reflect`] can result in faster compile times and reduced code generation over
//! directly deriving the [`serde`] traits.
//!
//! The way it works is by moving the serialization logic into common serializers and deserializers:
//! * [`ReflectSerializer`]
//! * [`TypedReflectSerializer`]
//! * [`UntypedReflectDeserializer`]
//! * [`TypedReflectDeserializer`]
//!
//! All of these structs require a reference to the [registry] so that [type information] can be retrieved,
//! as well as registered type data, such as [`ReflectSerialize`] and [`ReflectDeserialize`].
//!
//! The general entry point are the "untyped" versions of these structs.
//! These will automatically extract the type information and pass them into their respective "typed" version.
//!
//! The output of the `ReflectSerializer` will be a map, where the key is the [type path]
//! and the value is the serialized data.
//! The `TypedReflectSerializer` will simply output the serialized data.
//!
//! The `UntypedReflectDeserializer` can be used to deserialize this map and return a `Box<dyn Reflect>`,
//! where the underlying type will be a dynamic type representing some concrete type (except for value types).
//!
//! Again, it's important to remember that dynamic types may need to be converted to their concrete counterparts
//! in order to be used in certain cases.
//! This can be achieved using [`FromReflect`].
//!
//! ```
//! # use serde::de::DeserializeSeed;
//! # use bevy_reflect::{
//! # serde::{ReflectSerializer, UntypedReflectDeserializer},
//! # Reflect, FromReflect, TypeRegistry
//! # };
//! #[derive(Reflect, PartialEq, Debug)]
//! struct MyStruct {
//! foo: i32
//! }
//!
//! let original_value = MyStruct {
//! foo: 123
//! };
//!
//! // Register
//! let mut registry = TypeRegistry::new();
//! registry.register::<MyStruct>();
//!
//! // Serialize
//! let reflect_serializer = ReflectSerializer::new(&original_value, &registry);
//! let serialized_value: String = ron::to_string(&reflect_serializer).unwrap();
//!
//! // Deserialize
//! let reflect_deserializer = UntypedReflectDeserializer::new(&registry);
//! let deserialized_value: Box<dyn Reflect> = reflect_deserializer.deserialize(
//! &mut ron::Deserializer::from_str(&serialized_value).unwrap()
//! ).unwrap();
//!
//! // Convert
//! let converted_value = <MyStruct as FromReflect>::from_reflect(&*deserialized_value).unwrap();
//!
//! assert_eq!(original_value, converted_value);
//! ```
//!
//! # Limitations
//!
//! While this crate offers a lot in terms of adding reflection to Rust,
//! it does come with some limitations that don't make it as featureful as reflection
//! in other programming languages.
//!
//! ## Non-Static Lifetimes
//!
//! One of the most obvious limitations is the `'static` requirement.
//! Rust requires fields to define a lifetime for referenced data,
//! but [`Reflect`] requires all types to have a `'static` lifetime.
//! This makes it impossible to reflect any type with non-static borrowed data.
//!
//! ## Function Reflection
//!
//! Another limitation is the inability to fully reflect functions and methods.
//! Most languages offer some way of calling methods dynamically,
//! but Rust makes this very difficult to do.
//! For non-generic methods, this can be done by registering custom [type data] that
//! contains function pointers.
//! For generic methods, the same can be done but will typically require manual monomorphization
//! (i.e. manually specifying the types the generic method can take).
//!
//! ## Manual Registration
//!
//! Since Rust doesn't provide built-in support for running initialization code before `main`,
//! there is no way for `bevy_reflect` to automatically register types into the [type registry].
//! This means types must manually be registered, including their desired monomorphized
//! representations if generic.
//!
//! # Features
//!
//! ## `bevy`
//!
//! | Default | Dependencies |
//! | :-----: | :---------------------------------------: |
//! | ❌ | [`bevy_math`], [`glam`], [`smallvec`] |
//!
//! This feature makes it so that the appropriate reflection traits are implemented on all the types
//! necessary for the [Bevy] game engine.
//! enables the optional dependencies: [`bevy_math`], [`glam`], and [`smallvec`].
//! These dependencies are used by the [Bevy] game engine and must define their reflection implementations
//! within this crate due to Rust's [orphan rule].
//!
//! ## `documentation`
//!
//! | Default | Dependencies |
//! | :-----: | :-------------------------------------------: |
//! | ❌ | [`bevy_reflect_derive/documentation`] |
//!
//! This feature enables capturing doc comments as strings for items that [derive `Reflect`].
//! Documentation information can then be accessed at runtime on the [`TypeInfo`] of that item.
//!
//! This can be useful for generating documentation for scripting language interop or
//! for displaying tooltips in an editor.
//!
//! [Reflection]: https://en.wikipedia.org/wiki/Reflective_programming
//! [Bevy]: https://bevyengine.org/
//! [limitations]: #limitations
//! [`bevy_reflect`]: crate
//! [runtime cost]: https://doc.rust-lang.org/book/ch17-02-trait-objects.html#trait-objects-perform-dynamic-dispatch
//! [derive macro]: derive@crate::Reflect
//! [`'static` lifetime]: https://doc.rust-lang.org/rust-by-example/scope/lifetime/static_lifetime.html#trait-bound
//! [derive macro documentation]: derive@crate::Reflect
//! [deriving `Reflect`]: derive@crate::Reflect
//! [type data]: TypeData
//! [`ReflectDefault`]: std_traits::ReflectDefault
//! [object-safe]: https://doc.rust-lang.org/reference/items/traits.html#object-safety
//! [`serde`]: ::serde
//! [`ReflectSerializer`]: serde::ReflectSerializer
//! [`TypedReflectSerializer`]: serde::TypedReflectSerializer
//! [`UntypedReflectDeserializer`]: serde::UntypedReflectDeserializer
//! [`TypedReflectDeserializer`]: serde::TypedReflectDeserializer
//! [registry]: TypeRegistry
//! [type information]: TypeInfo
//! [type path]: TypePath
//! [type registry]: TypeRegistry
//! [`bevy_math`]: https://docs.rs/bevy_math/latest/bevy_math/
//! [`glam`]: https://docs.rs/glam/latest/glam/
//! [`smallvec`]: https://docs.rs/smallvec/latest/smallvec/
//! [orphan rule]: https://doc.rust-lang.org/book/ch10-02-traits.html#implementing-a-trait-on-a-type:~:text=But%20we%20can%E2%80%99t,implementation%20to%20use.
//! [`bevy_reflect_derive/documentation`]: bevy_reflect_derive
//! [derive `Reflect`]: derive@crate::Reflect
mod array;
mod fields;
mod from_reflect;
mod list;
mod map;
mod path;
mod reflect;
mod struct_trait;
mod tuple;
mod tuple_struct;
mod type_info;
mod type_path;
mod type_registry;
mod type_uuid;
mod type_uuid_impl;
mod impls {
#[cfg(feature = "glam")]
mod glam;
#[cfg(feature = "bevy_math")]
mod rect;
#[cfg(feature = "smallvec")]
mod smallvec;
#[cfg(feature = "smol_str")]
mod smol_str;
mod std;
mod uuid;
}
mod enums;
pub mod serde;
pub mod std_traits;
pub mod utility;
pub mod prelude {
pub use crate::std_traits::*;
#[doc(hidden)]
pub use crate::{
reflect_trait, FromReflect, GetField, GetPath, GetTupleStructField, Reflect,
ReflectDeserialize, ReflectFromReflect, ReflectPath, ReflectSerialize, Struct, TupleStruct,
TypePath,
};
}
pub use array::*;
pub use enums::*;
pub use fields::*;
pub use from_reflect::*;
pub use list::*;
pub use map::*;
pub use path::*;
pub use reflect::*;
pub use struct_trait::*;
pub use tuple::*;
pub use tuple_struct::*;
pub use type_info::*;
pub use type_path::*;
pub use type_registry::*;
pub use type_uuid::*;
pub use bevy_reflect_derive::*;
pub use erased_serde;
extern crate alloc;
#[doc(hidden)]
pub mod __macro_exports {
pub use bevy_utils::uuid::generate_composite_uuid;
}
#[cfg(test)]
#[allow(clippy::disallowed_types, clippy::approx_constant)]
mod tests {
#[cfg(feature = "glam")]
use ::glam::{quat, vec3, Quat, Vec3};
use ::serde::{de::DeserializeSeed, Deserialize, Serialize};
use bevy_utils::HashMap;
use ron::{
ser::{to_string_pretty, PrettyConfig},
Deserializer,
};
use std::{
any::TypeId,
borrow::Cow,
fmt::{Debug, Formatter},
marker::PhantomData,
};
use super::prelude::*;
use super::*;
use crate as bevy_reflect;
use crate::serde::{ReflectSerializer, UntypedReflectDeserializer};
use crate::utility::GenericTypePathCell;
#[test]
fn reflect_struct() {
#[derive(Reflect)]
struct Foo {
a: u32,
b: f32,
c: Bar,
}
#[derive(Reflect)]
struct Bar {
x: u32,
}
let mut foo = Foo {
a: 42,
b: 3.14,
c: Bar { x: 1 },
};
let a = *foo.get_field::<u32>("a").unwrap();
assert_eq!(a, 42);
*foo.get_field_mut::<u32>("a").unwrap() += 1;
assert_eq!(foo.a, 43);
let bar = foo.get_field::<Bar>("c").unwrap();
assert_eq!(bar.x, 1);
// 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.");
}
// patch Foo with a dynamic struct
let mut dynamic_struct = DynamicStruct::default();
dynamic_struct.insert("a", 123u32);
dynamic_struct.insert("should_be_ignored", 456);
foo.apply(&dynamic_struct);
assert_eq!(foo.a, 123);
}
#[test]
fn reflect_map() {
#[derive(Reflect, Hash)]
#[reflect(Hash)]
struct Foo {
a: u32,
b: String,
}
let key_a = Foo {
a: 1,
b: "k1".to_string(),
};
let key_b = Foo {
a: 1,
b: "k1".to_string(),
};
let key_c = Foo {
a: 3,
b: "k3".to_string(),
};
let mut map = DynamicMap::default();
map.insert(key_a, 10u32);
assert_eq!(10, *map.get(&key_b).unwrap().downcast_ref::<u32>().unwrap());
assert!(map.get(&key_c).is_none());
*map.get_mut(&key_b).unwrap().downcast_mut::<u32>().unwrap() = 20;
assert_eq!(20, *map.get(&key_b).unwrap().downcast_ref::<u32>().unwrap());
}
#[test]
#[allow(clippy::disallowed_types)]
fn reflect_unit_struct() {
#[derive(Reflect)]
struct Foo(u32, u64);
let mut foo = Foo(1, 2);
assert_eq!(1, *foo.get_field::<u32>(0).unwrap());
assert_eq!(2, *foo.get_field::<u64>(1).unwrap());
let mut patch = DynamicTupleStruct::default();
patch.insert(3u32);
patch.insert(4u64);
assert_eq!(3, *patch.field(0).unwrap().downcast_ref::<u32>().unwrap());
assert_eq!(4, *patch.field(1).unwrap().downcast_ref::<u64>().unwrap());
foo.apply(&patch);
assert_eq!(3, foo.0);
assert_eq!(4, foo.1);
let mut iter = patch.iter_fields();
assert_eq!(3, *iter.next().unwrap().downcast_ref::<u32>().unwrap());
assert_eq!(4, *iter.next().unwrap().downcast_ref::<u64>().unwrap());
}
#[test]
#[should_panic(expected = "the given key does not support hashing")]
fn reflect_map_no_hash() {
#[derive(Reflect)]
struct Foo {
a: u32,
}
let foo = Foo { a: 1 };
let mut map = DynamicMap::default();
map.insert(foo, 10u32);
}
#[test]
fn reflect_ignore() {
#[derive(Reflect)]
struct Foo {
a: u32,
#[reflect(ignore)]
_b: u32,
}
let foo = Foo { a: 1, _b: 2 };
let values: Vec<u32> = foo
.iter_fields()
.map(|value| *value.downcast_ref::<u32>().unwrap())
.collect();
assert_eq!(values, vec![1]);
}
#[test]
fn should_call_from_reflect_dynamically() {
#[derive(Reflect)]
struct MyStruct {
foo: usize,
}
// Register
let mut registry = TypeRegistry::default();
registry.register::<MyStruct>();
// Get type data
let type_id = TypeId::of::<MyStruct>();
let rfr = registry
.get_type_data::<ReflectFromReflect>(type_id)
.expect("the FromReflect trait should be registered");
// Call from_reflect
let mut dynamic_struct = DynamicStruct::default();
dynamic_struct.insert("foo", 123usize);
let reflected = rfr
.from_reflect(&dynamic_struct)
.expect("the type should be properly reflected");
// Assert
let expected = MyStruct { foo: 123 };
assert!(expected
.reflect_partial_eq(reflected.as_ref())
.unwrap_or_default());
let not_expected = MyStruct { foo: 321 };
assert!(!not_expected
.reflect_partial_eq(reflected.as_ref())
.unwrap_or_default());
}
#[test]
fn from_reflect_should_allow_ignored_unnamed_fields() {
#[derive(Reflect, Eq, PartialEq, Debug)]
struct MyTupleStruct(i8, #[reflect(ignore)] i16, i32);
let expected = MyTupleStruct(1, 0, 3);
let mut dyn_tuple_struct = DynamicTupleStruct::default();
dyn_tuple_struct.insert(1_i8);
dyn_tuple_struct.insert(3_i32);
let my_tuple_struct = <MyTupleStruct as FromReflect>::from_reflect(&dyn_tuple_struct);
assert_eq!(Some(expected), my_tuple_struct);
#[derive(Reflect, Eq, PartialEq, Debug)]
enum MyEnum {
Tuple(i8, #[reflect(ignore)] i16, i32),
}
let expected = MyEnum::Tuple(1, 0, 3);
let mut dyn_tuple = DynamicTuple::default();
dyn_tuple.insert(1_i8);
dyn_tuple.insert(3_i32);
let mut dyn_enum = DynamicEnum::default();
dyn_enum.set_variant("Tuple", dyn_tuple);
let my_enum = <MyEnum as FromReflect>::from_reflect(&dyn_enum);
assert_eq!(Some(expected), my_enum);
}
#[test]
fn from_reflect_should_use_default_field_attributes() {
#[derive(Reflect, Eq, PartialEq, Debug)]
struct MyStruct {
// Use `Default::default()`
// Note that this isn't an ignored field
#[reflect(default)]
foo: String,
// Use `get_bar_default()`
#[reflect(ignore)]
#[reflect(default = "get_bar_default")]
bar: NotReflect,
// Ensure attributes can be combined
#[reflect(ignore, default = "get_bar_default")]
baz: NotReflect,
}
#[derive(Eq, PartialEq, Debug)]
struct NotReflect(usize);
fn get_bar_default() -> NotReflect {
NotReflect(123)
}
let expected = MyStruct {
foo: String::default(),
bar: NotReflect(123),
baz: NotReflect(123),
};
let dyn_struct = DynamicStruct::default();
let my_struct = <MyStruct as FromReflect>::from_reflect(&dyn_struct);
assert_eq!(Some(expected), my_struct);
}
#[test]
fn from_reflect_should_use_default_variant_field_attributes() {
#[derive(Reflect, Eq, PartialEq, Debug)]
enum MyEnum {
Foo(#[reflect(default)] String),
Bar {
#[reflect(default = "get_baz_default")]
#[reflect(ignore)]
baz: usize,
},
}
fn get_baz_default() -> usize {
123
}
let expected = MyEnum::Foo(String::default());
let dyn_enum = DynamicEnum::new("Foo", DynamicTuple::default());
let my_enum = <MyEnum as FromReflect>::from_reflect(&dyn_enum);
assert_eq!(Some(expected), my_enum);
let expected = MyEnum::Bar {
baz: get_baz_default(),
};
let dyn_enum = DynamicEnum::new("Bar", DynamicStruct::default());
let my_enum = <MyEnum as FromReflect>::from_reflect(&dyn_enum);
assert_eq!(Some(expected), my_enum);
}
#[test]
fn from_reflect_should_use_default_container_attribute() {
#[derive(Reflect, Eq, PartialEq, Debug)]
#[reflect(Default)]
struct MyStruct {
foo: String,
#[reflect(ignore)]
bar: usize,
}
impl Default for MyStruct {
fn default() -> Self {
Self {
foo: String::from("Hello"),
bar: 123,
}
}
}
let expected = MyStruct {
foo: String::from("Hello"),
bar: 123,
};
let dyn_struct = DynamicStruct::default();
let my_struct = <MyStruct as FromReflect>::from_reflect(&dyn_struct);
assert_eq!(Some(expected), my_struct);
}
#[test]
fn reflect_complex_patch() {
#[derive(Reflect, Eq, PartialEq, Debug)]
#[reflect(PartialEq)]
struct Foo {
a: u32,
#[reflect(ignore)]
_b: u32,
c: Vec<isize>,
d: HashMap<usize, i8>,
e: Bar,
f: (i32, Vec<isize>, Bar),
g: Vec<(Baz, HashMap<usize, Bar>)>,
h: [u32; 2],
}
#[derive(Reflect, Eq, PartialEq, Clone, Debug)]
#[reflect(PartialEq)]
struct Bar {
x: u32,
}
#[derive(Reflect, Eq, PartialEq, Debug)]
struct Baz(String);
let mut hash_map = HashMap::default();
hash_map.insert(1, 1);
hash_map.insert(2, 2);
let mut hash_map_baz = HashMap::default();
hash_map_baz.insert(1, Bar { x: 0 });
let mut foo = Foo {
a: 1,
_b: 1,
c: vec![1, 2],
d: hash_map,
e: Bar { x: 1 },
f: (1, vec![1, 2], Bar { x: 1 }),
g: vec![(Baz("string".to_string()), hash_map_baz)],
h: [2; 2],
};
let mut foo_patch = DynamicStruct::default();
foo_patch.insert("a", 2u32);
foo_patch.insert("b", 2u32); // this should be ignored
let mut list = DynamicList::default();
list.push(3isize);
list.push(4isize);
list.push(5isize);
foo_patch.insert("c", list.clone_dynamic());
let mut map = DynamicMap::default();
map.insert(2usize, 3i8);
map.insert(3usize, 4i8);
foo_patch.insert("d", map);
let mut bar_patch = DynamicStruct::default();
bar_patch.insert("x", 2u32);
foo_patch.insert("e", bar_patch.clone_dynamic());
let mut tuple = DynamicTuple::default();
tuple.insert(2i32);
tuple.insert(list);
tuple.insert(bar_patch);
foo_patch.insert("f", tuple);
let mut composite = DynamicList::default();
composite.push({
let mut tuple = DynamicTuple::default();
tuple.insert({
let mut tuple_struct = DynamicTupleStruct::default();
tuple_struct.insert("new_string".to_string());
tuple_struct
});
tuple.insert({
let mut map = DynamicMap::default();
map.insert(1usize, {
let mut struct_ = DynamicStruct::default();
struct_.insert("x", 7u32);
struct_
});
map
});
tuple
});
foo_patch.insert("g", composite);
let array = DynamicArray::from_vec(vec![2u32, 2u32]);
foo_patch.insert("h", array);
foo.apply(&foo_patch);
let mut hash_map = HashMap::default();
hash_map.insert(1, 1);
hash_map.insert(2, 3);
hash_map.insert(3, 4);
let mut hash_map_baz = HashMap::default();
hash_map_baz.insert(1, Bar { x: 7 });
let expected_foo = Foo {
a: 2,
_b: 1,
c: vec![3, 4, 5],
d: hash_map,
e: Bar { x: 2 },
f: (2, vec![3, 4, 5], Bar { x: 2 }),
g: vec![(Baz("new_string".to_string()), hash_map_baz.clone())],
h: [2; 2],
};
assert_eq!(foo, expected_foo);
let new_foo = Foo::from_reflect(&foo_patch)
.expect("error while creating a concrete type from a dynamic type");
let mut hash_map = HashMap::default();
hash_map.insert(2, 3);
hash_map.insert(3, 4);
let expected_new_foo = Foo {
a: 2,
_b: 0,
c: vec![3, 4, 5],
d: hash_map,
e: Bar { x: 2 },
f: (2, vec![3, 4, 5], Bar { x: 2 }),
g: vec![(Baz("new_string".to_string()), hash_map_baz)],
h: [2; 2],
};
assert_eq!(new_foo, expected_new_foo);
}
#[test]
fn reflect_serialize() {
#[derive(Reflect)]
struct Foo {
a: u32,
#[reflect(ignore)]
_b: u32,
c: Vec<isize>,
d: HashMap<usize, i8>,
e: Bar,
f: String,
g: (i32, Vec<isize>, Bar),
h: [u32; 2],
}
#[derive(Reflect, Serialize, Deserialize)]
#[reflect(Serialize, Deserialize)]
struct Bar {
x: u32,
}
let mut hash_map = HashMap::default();
hash_map.insert(1, 1);
hash_map.insert(2, 2);
let foo = Foo {
a: 1,
_b: 1,
c: vec![1, 2],
d: hash_map,
e: Bar { x: 1 },
f: "hi".to_string(),
g: (1, vec![1, 2], Bar { x: 1 }),
h: [2; 2],
};
let mut registry = TypeRegistry::default();
registry.register::<u32>();
registry.register::<i8>();
registry.register::<i32>();
registry.register::<usize>();
registry.register::<isize>();
registry.register::<Foo>();
registry.register::<Bar>();
registry.register::<String>();
registry.register::<Vec<isize>>();
registry.register::<HashMap<usize, i8>>();
registry.register::<(i32, Vec<isize>, Bar)>();
registry.register::<[u32; 2]>();
let serializer = ReflectSerializer::new(&foo, &registry);
let serialized = to_string_pretty(&serializer, PrettyConfig::default()).unwrap();
let mut deserializer = Deserializer::from_str(&serialized).unwrap();
let reflect_deserializer = UntypedReflectDeserializer::new(&registry);
let value = reflect_deserializer.deserialize(&mut deserializer).unwrap();
let dynamic_struct = value.take::<DynamicStruct>().unwrap();
assert!(foo.reflect_partial_eq(&dynamic_struct).unwrap());
}
#[test]
fn reflect_downcast() {
#[derive(Reflect, Clone, Debug, PartialEq)]
struct Bar {
y: u8,
}
#[derive(Reflect, Clone, Debug, PartialEq)]
struct Foo {
x: i32,
s: String,
b: Bar,
u: usize,
t: ([f32; 3], String),
v: Cow<'static, str>,
w: Cow<'static, [u8]>,
}
let foo = Foo {
x: 123,
s: "String".to_string(),
b: Bar { y: 255 },
u: 1111111111111,
t: ([3.0, 2.0, 1.0], "Tuple String".to_string()),
v: Cow::Owned("Cow String".to_string()),
w: Cow::Owned(vec![1, 2, 3]),
};
let foo2: Box<dyn Reflect> = Box::new(foo.clone());
assert_eq!(foo, *foo2.downcast::<Foo>().unwrap());
}
#[test]
fn should_drain_fields() {
let array_value: Box<dyn Array> = Box::new([123_i32, 321_i32]);
let fields = array_value.drain();
assert!(fields[0].reflect_partial_eq(&123_i32).unwrap_or_default());
assert!(fields[1].reflect_partial_eq(&321_i32).unwrap_or_default());
let list_value: Box<dyn List> = Box::new(vec![123_i32, 321_i32]);
let fields = list_value.drain();
assert!(fields[0].reflect_partial_eq(&123_i32).unwrap_or_default());
assert!(fields[1].reflect_partial_eq(&321_i32).unwrap_or_default());
let tuple_value: Box<dyn Tuple> = Box::new((123_i32, 321_i32));
let fields = tuple_value.drain();
assert!(fields[0].reflect_partial_eq(&123_i32).unwrap_or_default());
assert!(fields[1].reflect_partial_eq(&321_i32).unwrap_or_default());
let map_value: Box<dyn Map> = Box::new(HashMap::from([(123_i32, 321_i32)]));
let fields = map_value.drain();
assert!(fields[0].0.reflect_partial_eq(&123_i32).unwrap_or_default());
assert!(fields[0].1.reflect_partial_eq(&321_i32).unwrap_or_default());
}
#[test]
fn reflect_take() {
#[derive(Reflect, Debug, PartialEq)]
#[reflect(PartialEq)]
struct Bar {
x: u32,
}
let x: Box<dyn Reflect> = Box::new(Bar { x: 2 });
let y = x.take::<Bar>().unwrap();
assert_eq!(y, Bar { x: 2 });
}
#[test]
fn not_dynamic_names() {
let list = Vec::<usize>::new();
let dyn_list = list.clone_dynamic();
assert_ne!(dyn_list.reflect_type_path(), Vec::<usize>::type_path());
let array = [b'0'; 4];
let dyn_array = array.clone_dynamic();
assert_ne!(dyn_array.reflect_type_path(), <[u8; 4]>::type_path());
let map = HashMap::<usize, String>::default();
let dyn_map = map.clone_dynamic();
assert_ne!(
dyn_map.reflect_type_path(),
HashMap::<usize, String>::type_path()
);
let tuple = (0usize, "1".to_string(), 2.0f32);
let mut dyn_tuple = tuple.clone_dynamic();
dyn_tuple.insert::<usize>(3);
assert_ne!(
dyn_tuple.reflect_type_path(),
<(usize, String, f32, usize)>::type_path()
);
#[derive(Reflect)]
struct TestStruct {
a: usize,
}
let struct_ = TestStruct { a: 0 };
let dyn_struct = struct_.clone_dynamic();
assert_ne!(dyn_struct.reflect_type_path(), TestStruct::type_path());
#[derive(Reflect)]
struct TestTupleStruct(usize);
let tuple_struct = TestTupleStruct(0);
let dyn_tuple_struct = tuple_struct.clone_dynamic();
assert_ne!(
dyn_tuple_struct.reflect_type_path(),
TestTupleStruct::type_path()
);
}
macro_rules! assert_type_paths {
($($ty:ty => $long:literal, $short:literal,)*) => {
$(
assert_eq!(<$ty as TypePath>::type_path(), $long);
assert_eq!(<$ty as TypePath>::short_type_path(), $short);
)*
};
}
#[test]
fn reflect_type_path() {
#[derive(TypePath)]
struct Param;
#[derive(TypePath)]
struct Derive;
#[derive(TypePath)]
#[type_path = "my_alias"]
struct DerivePath;
#[derive(TypePath)]
#[type_path = "my_alias"]
#[type_name = "MyDerivePathName"]
struct DerivePathName;
#[derive(TypePath)]
struct DeriveG<T>(PhantomData<T>);
#[derive(TypePath)]
#[type_path = "my_alias"]
struct DerivePathG<T, const N: usize>(PhantomData<T>);
#[derive(TypePath)]
#[type_path = "my_alias"]
#[type_name = "MyDerivePathNameG"]
struct DerivePathNameG<T>(PhantomData<T>);
struct Macro;
impl_type_path!((in my_alias) Macro);
struct MacroName;
impl_type_path!((in my_alias as MyMacroName) MacroName);
struct MacroG<T, const N: usize>(PhantomData<T>);
impl_type_path!((in my_alias) MacroG<T, const N: usize>);
struct MacroNameG<T>(PhantomData<T>);
impl_type_path!((in my_alias as MyMacroNameG) MacroNameG<T>);
assert_type_paths! {
Derive => "bevy_reflect::tests::Derive", "Derive",
DerivePath => "my_alias::DerivePath", "DerivePath",
DerivePathName => "my_alias::MyDerivePathName", "MyDerivePathName",
DeriveG<Param> => "bevy_reflect::tests::DeriveG<bevy_reflect::tests::Param>", "DeriveG<Param>",
DerivePathG<Param, 10> => "my_alias::DerivePathG<bevy_reflect::tests::Param, 10>", "DerivePathG<Param, 10>",
DerivePathNameG<Param> => "my_alias::MyDerivePathNameG<bevy_reflect::tests::Param>", "MyDerivePathNameG<Param>",
Macro => "my_alias::Macro", "Macro",
MacroName => "my_alias::MyMacroName", "MyMacroName",
MacroG<Param, 10> => "my_alias::MacroG<bevy_reflect::tests::Param, 10>", "MacroG<Param, 10>",
MacroNameG<Param> => "my_alias::MyMacroNameG<bevy_reflect::tests::Param>", "MyMacroNameG<Param>",
}
}
#[test]
fn std_type_paths() {
#[derive(Clone)]
struct Type;
impl TypePath for Type {
fn type_path() -> &'static str {
// for brevity in tests
"Long"
}
fn short_type_path() -> &'static str {
"Short"
}
}
assert_type_paths! {
u8 => "u8", "u8",
Type => "Long", "Short",
&Type => "&Long", "&Short",
[Type] => "[Long]", "[Short]",
&[Type] => "&[Long]", "&[Short]",
[Type; 0] => "[Long; 0]", "[Short; 0]",
[Type; 100] => "[Long; 100]", "[Short; 100]",
() => "()", "()",
(Type,) => "(Long,)", "(Short,)",
(Type, Type) => "(Long, Long)", "(Short, Short)",
(Type, Type, Type) => "(Long, Long, Long)", "(Short, Short, Short)",
Cow<'static, Type> => "alloc::borrow::Cow<Long>", "Cow<Short>",
}
}
#[test]
fn reflect_type_info() {
// TypeInfo
let info = i32::type_info();
assert_eq!(i32::type_path(), info.type_path());
assert_eq!(TypeId::of::<i32>(), info.type_id());
// TypeInfo (unsized)
assert_eq!(
TypeId::of::<dyn Reflect>(),
<dyn Reflect as Typed>::type_info().type_id()
);
// TypeInfo (instance)
let value: &dyn Reflect = &123_i32;
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<i32>());
// Struct
#[derive(Reflect)]
struct MyStruct {
foo: i32,
bar: usize,
}
let info = MyStruct::type_info();
if let TypeInfo::Struct(info) = info {
assert!(info.is::<MyStruct>());
assert_eq!(MyStruct::type_path(), info.type_path());
assert_eq!(i32::type_path(), info.field("foo").unwrap().type_path());
assert_eq!(TypeId::of::<i32>(), info.field("foo").unwrap().type_id());
assert!(info.field("foo").unwrap().is::<i32>());
assert_eq!("foo", info.field("foo").unwrap().name());
assert_eq!(usize::type_path(), info.field_at(1).unwrap().type_path());
} else {
panic!("Expected `TypeInfo::Struct`");
}
let value: &dyn Reflect = &MyStruct { foo: 123, bar: 321 };
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyStruct>());
// Struct (generic)
#[derive(Reflect)]
struct MyGenericStruct<T> {
foo: T,
bar: usize,
}
let info = <MyGenericStruct<i32>>::type_info();
if let TypeInfo::Struct(info) = info {
assert!(info.is::<MyGenericStruct<i32>>());
assert_eq!(MyGenericStruct::<i32>::type_path(), info.type_path());
assert_eq!(i32::type_path(), info.field("foo").unwrap().type_path());
assert_eq!("foo", info.field("foo").unwrap().name());
assert_eq!(usize::type_path(), info.field_at(1).unwrap().type_path());
} else {
panic!("Expected `TypeInfo::Struct`");
}
let value: &dyn Reflect = &MyGenericStruct {
foo: String::from("Hello!"),
bar: 321,
};
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyGenericStruct<String>>());
// Tuple Struct
#[derive(Reflect)]
struct MyTupleStruct(usize, i32, MyStruct);
let info = MyTupleStruct::type_info();
if let TypeInfo::TupleStruct(info) = info {
assert!(info.is::<MyTupleStruct>());
assert_eq!(MyTupleStruct::type_path(), info.type_path());
assert_eq!(i32::type_path(), info.field_at(1).unwrap().type_path());
assert!(info.field_at(1).unwrap().is::<i32>());
} else {
panic!("Expected `TypeInfo::TupleStruct`");
}
// Tuple
type MyTuple = (u32, f32, String);
let info = MyTuple::type_info();
if let TypeInfo::Tuple(info) = info {
assert!(info.is::<MyTuple>());
assert_eq!(MyTuple::type_path(), info.type_path());
assert_eq!(f32::type_path(), info.field_at(1).unwrap().type_path());
} else {
panic!("Expected `TypeInfo::Tuple`");
}
let value: &dyn Reflect = &(123_u32, 1.23_f32, String::from("Hello!"));
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyTuple>());
// List
type MyList = Vec<usize>;
let info = MyList::type_info();
if let TypeInfo::List(info) = info {
assert!(info.is::<MyList>());
assert!(info.item_is::<usize>());
assert_eq!(MyList::type_path(), info.type_path());
assert_eq!(usize::type_path(), info.item_type_path_table().path());
} else {
panic!("Expected `TypeInfo::List`");
}
let value: &dyn Reflect = &vec![123_usize];
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyList>());
// List (SmallVec)
#[cfg(feature = "smallvec")]
{
type MySmallVec = smallvec::SmallVec<[String; 2]>;
let info = MySmallVec::type_info();
if let TypeInfo::List(info) = info {
assert!(info.is::<MySmallVec>());
assert!(info.item_is::<String>());
assert_eq!(MySmallVec::type_path(), info.type_path());
assert_eq!(String::type_path(), info.item_type_path_table().path());
} else {
panic!("Expected `TypeInfo::List`");
}
let value: MySmallVec = smallvec::smallvec![String::default(); 2];
let value: &dyn Reflect = &value;
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MySmallVec>());
}
// Array
type MyArray = [usize; 3];
let info = MyArray::type_info();
if let TypeInfo::Array(info) = info {
assert!(info.is::<MyArray>());
assert!(info.item_is::<usize>());
assert_eq!(MyArray::type_path(), info.type_path());
assert_eq!(usize::type_path(), info.item_type_path_table().path());
assert_eq!(3, info.capacity());
} else {
panic!("Expected `TypeInfo::Array`");
}
let value: &dyn Reflect = &[1usize, 2usize, 3usize];
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyArray>());
// Cow<'static, str>
type MyCowStr = Cow<'static, str>;
let info = MyCowStr::type_info();
if let TypeInfo::Value(info) = info {
assert!(info.is::<MyCowStr>());
assert_eq!(std::any::type_name::<MyCowStr>(), info.type_path());
} else {
panic!("Expected `TypeInfo::Value`");
}
let value: &dyn Reflect = &Cow::<'static, str>::Owned("Hello!".to_string());
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyCowStr>());
// Cow<'static, [u8]>
type MyCowSlice = Cow<'static, [u8]>;
let info = MyCowSlice::type_info();
if let TypeInfo::List(info) = info {
assert!(info.is::<MyCowSlice>());
assert!(info.item_is::<u8>());
assert_eq!(std::any::type_name::<MyCowSlice>(), info.type_path());
assert_eq!(
std::any::type_name::<u8>(),
info.item_type_path_table().path()
);
} else {
panic!("Expected `TypeInfo::List`");
}
let value: &dyn Reflect = &Cow::<'static, [u8]>::Owned(vec![0, 1, 2, 3]);
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyCowSlice>());
// Map
type MyMap = HashMap<usize, f32>;
let info = MyMap::type_info();
if let TypeInfo::Map(info) = info {
assert!(info.is::<MyMap>());
assert!(info.key_is::<usize>());
assert!(info.value_is::<f32>());
assert_eq!(MyMap::type_path(), info.type_path());
assert_eq!(usize::type_path(), info.key_type_path_table().path());
assert_eq!(f32::type_path(), info.value_type_path_table().path());
} else {
panic!("Expected `TypeInfo::Map`");
}
let value: &dyn Reflect = &MyMap::new();
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyMap>());
// Value
type MyValue = String;
let info = MyValue::type_info();
if let TypeInfo::Value(info) = info {
assert!(info.is::<MyValue>());
assert_eq!(MyValue::type_path(), info.type_path());
} else {
panic!("Expected `TypeInfo::Value`");
}
let value: &dyn Reflect = &String::from("Hello!");
let info = value.get_represented_type_info().unwrap();
assert!(info.is::<MyValue>());
}
#[test]
fn should_permit_higher_ranked_lifetimes() {
#[derive(Reflect)]
#[reflect(from_reflect = false)]
struct TestStruct {
#[reflect(ignore)]
_hrl: for<'a> fn(&'a str) -> &'a str,
}
impl Default for TestStruct {
fn default() -> Self {
TestStruct {
_hrl: |input| input,
}
}
}
fn get_type_registration<T: GetTypeRegistration>() {}
get_type_registration::<TestStruct>();
}
#[test]
fn should_permit_valid_represented_type_for_dynamic() {
let type_info = <[i32; 2] as Typed>::type_info();
let mut dynamic_array = [123; 2].clone_dynamic();
dynamic_array.set_represented_type(Some(type_info));
}
#[test]
#[should_panic(expected = "expected TypeInfo::Array but received")]
fn should_prohibit_invalid_represented_type_for_dynamic() {
let type_info = <(i32, i32) as Typed>::type_info();
let mut dynamic_array = [123; 2].clone_dynamic();
dynamic_array.set_represented_type(Some(type_info));
}
#[cfg(feature = "documentation")]
mod docstrings {
use super::*;
#[test]
fn should_not_contain_docs() {
// Regular comments do not count as doc comments,
// and are therefore not reflected.
#[derive(Reflect)]
struct SomeStruct;
let info = <SomeStruct as Typed>::type_info();
assert_eq!(None, info.docs());
/*
* Block comments do not count as doc comments,
* and are therefore not reflected.
*/
#[derive(Reflect)]
struct SomeOtherStruct;
let info = <SomeOtherStruct as Typed>::type_info();
assert_eq!(None, info.docs());
}
#[test]
fn should_contain_docs() {
/// Some struct.
///
/// # Example
///
/// ```ignore
/// let some_struct = SomeStruct;
/// ```
#[derive(Reflect)]
struct SomeStruct;
let info = <SomeStruct as Typed>::type_info();
assert_eq!(
Some(" Some struct.\n\n # Example\n\n ```ignore\n let some_struct = SomeStruct;\n ```"),
info.docs()
);
#[doc = "The compiler automatically converts `///`-style comments into `#[doc]` attributes."]
#[doc = "Of course, you _could_ use the attribute directly if you wanted to."]
#[doc = "Both will be reflected."]
#[derive(Reflect)]
struct SomeOtherStruct;
let info = <SomeOtherStruct as Typed>::type_info();
assert_eq!(
Some("The compiler automatically converts `///`-style comments into `#[doc]` attributes.\nOf course, you _could_ use the attribute directly if you wanted to.\nBoth will be reflected."),
info.docs()
);
/// Some tuple struct.
#[derive(Reflect)]
struct SomeTupleStruct(usize);
let info = <SomeTupleStruct as Typed>::type_info();
assert_eq!(Some(" Some tuple struct."), info.docs());
/// Some enum.
#[derive(Reflect)]
enum SomeEnum {
Foo,
}
let info = <SomeEnum as Typed>::type_info();
assert_eq!(Some(" Some enum."), info.docs());
#[derive(Clone)]
struct SomePrimitive;
impl_reflect_value!(
/// Some primitive for which we have attributed custom documentation.
(in bevy_reflect::tests) SomePrimitive
);
let info = <SomePrimitive as Typed>::type_info();
assert_eq!(
Some(" Some primitive for which we have attributed custom documentation."),
info.docs()
);
}
#[test]
fn fields_should_contain_docs() {
#[derive(Reflect)]
struct SomeStruct {
/// The name
name: String,
/// The index
index: usize,
// Not documented...
data: Vec<i32>,
}
let info = <SomeStruct as Typed>::type_info();
if let TypeInfo::Struct(info) = info {
let mut fields = info.iter();
assert_eq!(Some(" The name"), fields.next().unwrap().docs());
assert_eq!(Some(" The index"), fields.next().unwrap().docs());
assert_eq!(None, fields.next().unwrap().docs());
} else {
panic!("expected struct info");
}
}
#[test]
fn variants_should_contain_docs() {
#[derive(Reflect)]
enum SomeEnum {
// Not documented...
Nothing,
/// Option A
A(
/// Index
usize,
),
/// Option B
B {
/// Name
name: String,
},
}
let info = <SomeEnum as Typed>::type_info();
if let TypeInfo::Enum(info) = info {
let mut variants = info.iter();
assert_eq!(None, variants.next().unwrap().docs());
let variant = variants.next().unwrap();
assert_eq!(Some(" Option A"), variant.docs());
if let VariantInfo::Tuple(variant) = variant {
let field = variant.field_at(0).unwrap();
assert_eq!(Some(" Index"), field.docs());
} else {
panic!("expected tuple variant")
}
let variant = variants.next().unwrap();
assert_eq!(Some(" Option B"), variant.docs());
if let VariantInfo::Struct(variant) = variant {
let field = variant.field_at(0).unwrap();
assert_eq!(Some(" Name"), field.docs());
} else {
panic!("expected struct variant")
}
} else {
panic!("expected enum info");
}
}
}
#[test]
fn into_reflect() {
trait TestTrait: Reflect {}
#[derive(Reflect)]
struct TestStruct;
impl TestTrait for TestStruct {}
let trait_object: Box<dyn TestTrait> = Box::new(TestStruct);
// Should compile:
let _ = trait_object.into_reflect();
}
#[test]
fn as_reflect() {
trait TestTrait: Reflect {}
#[derive(Reflect)]
struct TestStruct;
impl TestTrait for TestStruct {}
let trait_object: Box<dyn TestTrait> = Box::new(TestStruct);
// Should compile:
let _ = trait_object.as_reflect();
}
#[test]
fn should_reflect_debug() {
#[derive(Reflect)]
struct Test {
value: usize,
list: Vec<String>,
array: [f32; 3],
map: HashMap<i32, f32>,
a_struct: SomeStruct,
a_tuple_struct: SomeTupleStruct,
enum_unit: SomeEnum,
enum_tuple: SomeEnum,
enum_struct: SomeEnum,
custom: CustomDebug,
#[reflect(ignore)]
#[allow(dead_code)]
ignored: isize,
}
#[derive(Reflect)]
struct SomeStruct {
foo: String,
}
#[derive(Reflect)]
enum SomeEnum {
A,
B(usize),
C { value: i32 },
}
#[derive(Reflect)]
struct SomeTupleStruct(String);
#[derive(Reflect)]
#[reflect(Debug)]
struct CustomDebug;
impl Debug for CustomDebug {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
f.write_str("Cool debug!")
}
}
let mut map = HashMap::new();
map.insert(123, 1.23);
let test = Test {
value: 123,
list: vec![String::from("A"), String::from("B"), String::from("C")],
array: [1.0, 2.0, 3.0],
map,
a_struct: SomeStruct {
foo: String::from("A Struct!"),
},
a_tuple_struct: SomeTupleStruct(String::from("A Tuple Struct!")),
enum_unit: SomeEnum::A,
enum_tuple: SomeEnum::B(123),
enum_struct: SomeEnum::C { value: 321 },
custom: CustomDebug,
ignored: 321,
};
let reflected: &dyn Reflect = &test;
let expected = r#"
bevy_reflect::tests::Test {
value: 123,
list: [
"A",
"B",
"C",
],
array: [
1.0,
2.0,
3.0,
],
map: {
123: 1.23,
},
a_struct: bevy_reflect::tests::SomeStruct {
foo: "A Struct!",
},
a_tuple_struct: bevy_reflect::tests::SomeTupleStruct(
"A Tuple Struct!",
),
enum_unit: A,
enum_tuple: B(
123,
),
enum_struct: C {
value: 321,
},
custom: Cool debug!,
}"#;
assert_eq!(expected, format!("\n{reflected:#?}"));
}
#[test]
fn multiple_reflect_lists() {
#[derive(Hash, PartialEq, Reflect)]
#[reflect(Debug, Hash)]
#[reflect(PartialEq)]
struct Foo(i32);
impl Debug for Foo {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "Foo")
}
}
let foo = Foo(123);
let foo: &dyn Reflect = &foo;
assert!(foo.reflect_hash().is_some());
assert_eq!(Some(true), foo.reflect_partial_eq(foo));
assert_eq!("Foo".to_string(), format!("{foo:?}"));
}
#[test]
fn multiple_reflect_value_lists() {
#[derive(Clone, Hash, PartialEq, Reflect)]
#[reflect_value(Debug, Hash)]
#[reflect_value(PartialEq)]
struct Foo(i32);
impl Debug for Foo {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "Foo")
}
}
let foo = Foo(123);
let foo: &dyn Reflect = &foo;
assert!(foo.reflect_hash().is_some());
assert_eq!(Some(true), foo.reflect_partial_eq(foo));
assert_eq!("Foo".to_string(), format!("{foo:?}"));
}
#[test]
fn custom_debug_function() {
#[derive(Reflect)]
#[reflect(Debug(custom_debug))]
struct Foo {
a: u32,
}
fn custom_debug(_x: &Foo, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(f, "123")
}
let foo = Foo { a: 1 };
let foo: &dyn Reflect = &foo;
assert_eq!("123", format!("{:?}", foo));
}
#[test]
fn recursive_typed_storage_does_not_hang() {
#[derive(Reflect)]
struct Recurse<T>(T);
let _ = <Recurse<Recurse<()>> as Typed>::type_info();
let _ = <Recurse<Recurse<()>> as TypePath>::type_path();
}
#[test]
fn can_opt_out_type_path() {
#[derive(Reflect)]
#[reflect(type_path = false)]
struct Foo<T> {
#[reflect(ignore)]
_marker: PhantomData<T>,
}
struct NotTypePath;
impl<T: 'static> TypePath for Foo<T> {
fn type_path() -> &'static str {
std::any::type_name::<Self>()
}
fn short_type_path() -> &'static str {
static CELL: GenericTypePathCell = GenericTypePathCell::new();
CELL.get_or_insert::<Self, _>(|| {
bevy_utils::get_short_name(std::any::type_name::<Self>())
})
}
fn crate_name() -> Option<&'static str> {
Some("bevy_reflect")
}
fn module_path() -> Option<&'static str> {
Some("bevy_reflect::tests")
}
fn type_ident() -> Option<&'static str> {
Some("Foo")
}
}
// Can use `TypePath`
let path = <Foo<NotTypePath> as TypePath>::type_path();
assert_eq!("bevy_reflect::tests::can_opt_out_type_path::Foo<bevy_reflect::tests::can_opt_out_type_path::NotTypePath>", path);
// Can register the type
let mut registry = TypeRegistry::default();
registry.register::<Foo<NotTypePath>>();
let registration = registry.get(TypeId::of::<Foo<NotTypePath>>()).unwrap();
assert_eq!(
"Foo<NotTypePath>",
registration.type_info().type_path_table().short_path()
);
}
#[test]
fn dynamic_types_debug_format() {
#[derive(Debug, Reflect)]
struct TestTupleStruct(u32);
#[derive(Debug, Reflect)]
enum TestEnum {
A(u32),
B,
}
#[derive(Debug, Reflect)]
// test DynamicStruct
struct TestStruct {
// test DynamicTuple
tuple: (u32, u32),
// test DynamicTupleStruct
tuple_struct: TestTupleStruct,
// test DynamicList
list: Vec<u32>,
// test DynamicArray
array: [u32; 3],
// test DynamicEnum
e: TestEnum,
// test DynamicMap
map: HashMap<u32, u32>,
// test reflected value
value: u32,
}
let mut map = HashMap::new();
map.insert(9, 10);
let mut test_struct = TestStruct {
tuple: (0, 1),
list: vec![2, 3, 4],
array: [5, 6, 7],
tuple_struct: TestTupleStruct(8),
e: TestEnum::A(11),
map,
value: 12,
}
.clone_value();
let test_struct = test_struct.downcast_mut::<DynamicStruct>().unwrap();
// test unknown DynamicStruct
let mut test_unknown_struct = DynamicStruct::default();
test_unknown_struct.insert("a", 13);
test_struct.insert("unknown_struct", test_unknown_struct);
// test unknown DynamicTupleStruct
let mut test_unknown_tuple_struct = DynamicTupleStruct::default();
test_unknown_tuple_struct.insert(14);
test_struct.insert("unknown_tuplestruct", test_unknown_tuple_struct);
assert_eq!(
format!("{:?}", test_struct),
"DynamicStruct(bevy_reflect::tests::TestStruct { \
tuple: DynamicTuple((0, 1)), \
tuple_struct: DynamicTupleStruct(bevy_reflect::tests::TestTupleStruct(8)), \
list: DynamicList([2, 3, 4]), \
array: DynamicArray([5, 6, 7]), \
e: DynamicEnum(A(11)), \
map: DynamicMap({9: 10}), \
value: 12, \
unknown_struct: DynamicStruct(_ { a: 13 }), \
unknown_tuplestruct: DynamicTupleStruct(_(14)) \
})"
);
}
#[cfg(feature = "glam")]
mod glam {
use super::*;
#[test]
fn quat_serialization() {
let q = quat(1.0, 2.0, 3.0, 4.0);
let mut registry = TypeRegistry::default();
registry.register::<f32>();
registry.register::<Quat>();
let ser = ReflectSerializer::new(&q, &registry);
let config = PrettyConfig::default()
.new_line(String::from("\n"))
.indentor(String::from(" "));
let output = to_string_pretty(&ser, config).unwrap();
let expected = r#"
{
"glam::Quat": (
x: 1.0,
y: 2.0,
z: 3.0,
w: 4.0,
),
}"#;
assert_eq!(expected, format!("\n{output}"));
}
#[test]
fn quat_deserialization() {
let data = r#"
{
"glam::Quat": (
x: 1.0,
y: 2.0,
z: 3.0,
w: 4.0,
),
}"#;
let mut registry = TypeRegistry::default();
registry.register::<Quat>();
registry.register::<f32>();
let de = UntypedReflectDeserializer::new(&registry);
let mut deserializer =
Deserializer::from_str(data).expect("Failed to acquire deserializer");
let dynamic_struct = de
.deserialize(&mut deserializer)
.expect("Failed to deserialize");
let mut result = Quat::default();
result.apply(&*dynamic_struct);
assert_eq!(result, quat(1.0, 2.0, 3.0, 4.0));
}
#[test]
fn vec3_serialization() {
let v = vec3(12.0, 3.0, -6.9);
let mut registry = TypeRegistry::default();
registry.register::<f32>();
registry.register::<Vec3>();
let ser = ReflectSerializer::new(&v, &registry);
let config = PrettyConfig::default()
.new_line(String::from("\n"))
.indentor(String::from(" "));
let output = to_string_pretty(&ser, config).unwrap();
let expected = r#"
{
"glam::Vec3": (
x: 12.0,
y: 3.0,
z: -6.9,
),
}"#;
assert_eq!(expected, format!("\n{output}"));
}
#[test]
fn vec3_deserialization() {
let data = r#"
{
"glam::Vec3": (
x: 12.0,
y: 3.0,
z: -6.9,
),
}"#;
let mut registry = TypeRegistry::default();
registry.add_registration(Vec3::get_type_registration());
registry.add_registration(f32::get_type_registration());
let de = UntypedReflectDeserializer::new(&registry);
let mut deserializer =
Deserializer::from_str(data).expect("Failed to acquire deserializer");
let dynamic_struct = de
.deserialize(&mut deserializer)
.expect("Failed to deserialize");
let mut result = Vec3::default();
result.apply(&*dynamic_struct);
assert_eq!(result, vec3(12.0, 3.0, -6.9));
}
#[test]
fn vec3_field_access() {
let mut v = vec3(1.0, 2.0, 3.0);
assert_eq!(*v.get_field::<f32>("x").unwrap(), 1.0);
*v.get_field_mut::<f32>("y").unwrap() = 6.0;
assert_eq!(v.y, 6.0);
}
#[test]
fn vec3_path_access() {
let mut v = vec3(1.0, 2.0, 3.0);
assert_eq!(
*v.reflect_path("x").unwrap().downcast_ref::<f32>().unwrap(),
1.0
);
*v.reflect_path_mut("y")
.unwrap()
.downcast_mut::<f32>()
.unwrap() = 6.0;
assert_eq!(v.y, 6.0);
}
#[test]
fn vec3_apply_dynamic() {
let mut v = vec3(3.0, 3.0, 3.0);
let mut d = DynamicStruct::default();
d.insert("x", 4.0f32);
d.insert("y", 2.0f32);
d.insert("z", 1.0f32);
v.apply(&d);
assert_eq!(v, vec3(4.0, 2.0, 1.0));
}
}
}
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