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impl Reflect for &'static Path (bevyengine#6755)
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# Objective

Fixes bevyengine#6739 

## Solution

Implement the required traits. They cannot be implemented for `Path` directly, since it is a dynamically-sized type.
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JoJoJet authored and ItsDoot committed Feb 1, 2023
1 parent e3ff908 commit 217040c
Showing 1 changed file with 110 additions and 0 deletions.
110 changes: 110 additions & 0 deletions crates/bevy_reflect/src/impls/std.rs
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ use bevy_utils::{Duration, Instant};
use bevy_utils::{HashMap, HashSet};
#[cfg(any(unix, windows))]
use std::ffi::OsString;
use std::path::Path;
use std::{
any::Any,
borrow::Cow,
Expand Down Expand Up @@ -745,6 +746,86 @@ impl Reflect for Cow<'static, str> {
}
}

impl Reflect for &'static Path {
fn type_name(&self) -> &str {
std::any::type_name::<Self>()
}

fn get_type_info(&self) -> &'static TypeInfo {
<Self as Typed>::type_info()
}

fn into_any(self: Box<Self>) -> Box<dyn Any> {
self
}

fn as_any(&self) -> &dyn Any {
self
}

fn as_any_mut(&mut self) -> &mut dyn Any {
self
}

fn into_reflect(self: Box<Self>) -> Box<dyn Reflect> {
self
}

fn as_reflect(&self) -> &dyn Reflect {
self
}

fn as_reflect_mut(&mut self) -> &mut dyn Reflect {
self
}

fn apply(&mut self, value: &dyn Reflect) {
let value = value.as_any();
if let Some(&value) = value.downcast_ref::<Self>() {
*self = value;
} else {
panic!("Value is not a {}.", std::any::type_name::<Self>());
}
}

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>> {
*self = value.take()?;
Ok(())
}

fn reflect_ref(&self) -> ReflectRef {
ReflectRef::Value(self)
}

fn reflect_mut(&mut self) -> ReflectMut {
ReflectMut::Value(self)
}

fn reflect_owned(self: Box<Self>) -> ReflectOwned {
ReflectOwned::Value(self)
}

fn clone_value(&self) -> Box<dyn Reflect> {
Box::new(*self)
}

fn reflect_hash(&self) -> Option<u64> {
let mut hasher = crate::ReflectHasher::default();
Hash::hash(&std::any::Any::type_id(self), &mut hasher);
Hash::hash(self, &mut hasher);
Some(hasher.finish())
}

fn reflect_partial_eq(&self, value: &dyn Reflect) -> Option<bool> {
let value = value.as_any();
if let Some(value) = value.downcast_ref::<Self>() {
Some(std::cmp::PartialEq::eq(self, value))
} else {
Some(false)
}
}
}

impl<T: FromReflect> GetTypeRegistration for Option<T> {
fn get_type_registration() -> TypeRegistration {
TypeRegistration::of::<Option<T>>()
Expand Down Expand Up @@ -1019,6 +1100,27 @@ impl FromReflect for Cow<'static, str> {
}
}

impl Typed for &'static Path {
fn type_info() -> &'static TypeInfo {
static CELL: NonGenericTypeInfoCell = NonGenericTypeInfoCell::new();
CELL.get_or_set(|| TypeInfo::Value(ValueInfo::new::<Self>()))
}
}

impl GetTypeRegistration for &'static Path {
fn get_type_registration() -> TypeRegistration {
let mut registration = TypeRegistration::of::<Self>();
registration.insert::<ReflectFromPtr>(FromType::<Self>::from_type());
registration
}
}

impl FromReflect for &'static Path {
fn from_reflect(reflect: &dyn crate::Reflect) -> Option<Self> {
reflect.as_any().downcast_ref::<Self>().copied()
}
}

#[cfg(test)]
mod tests {
use crate as bevy_reflect;
Expand All @@ -1029,6 +1131,7 @@ mod tests {
use bevy_utils::HashMap;
use bevy_utils::{Duration, Instant};
use std::f32::consts::{PI, TAU};
use std::path::Path;

#[test]
fn can_serialize_duration() {
Expand Down Expand Up @@ -1228,4 +1331,11 @@ mod tests {
let output = <Instant as FromReflect>::from_reflect(&expected).unwrap();
assert_eq!(expected, output);
}

#[test]
fn path_should_from_reflect() {
let path = Path::new("hello_world.rs");
let output = <&'static Path as FromReflect>::from_reflect(&path).unwrap();
assert_eq!(path, output);
}
}

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