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|
use std::alloc::Layout;
use std::any::{TypeId, type_name};
pub use engine_macros::Reflection;
pub trait With: 'static
{
const REFLECTION: &Reflection;
fn reflection() -> &'static Reflection
where
Self: Sized;
fn get_reflection(&self) -> &'static Reflection;
}
#[derive(Debug)]
#[non_exhaustive]
pub enum Reflection
{
Struct(Struct),
Array(Array),
Slice(Slice),
Literal(Literal),
}
impl Reflection
{
pub const fn as_struct(&self) -> Option<&Struct>
{
match self {
Self::Struct(struct_reflection) => Some(struct_reflection),
_ => None,
}
}
}
#[derive(Debug, Clone)]
pub struct Struct
{
pub fields: &'static [StructField],
}
#[derive(Debug, Clone)]
pub struct StructField
{
pub name: &'static str,
pub index: usize,
pub layout: Layout,
pub byte_offset: usize,
pub type_id: TypeId,
pub type_name: &'static str,
pub reflection: &'static Reflection,
}
#[derive(Debug, Clone)]
pub struct Array
{
pub item_reflection: &'static Reflection,
pub length: usize,
}
#[derive(Debug, Clone)]
pub struct Slice
{
pub item_reflection: &'static Reflection,
}
#[derive(Debug)]
pub struct Literal
{
pub layout: Layout,
pub type_id: TypeId,
pub type_name: fn() -> &'static str,
}
macro_rules! impl_with_for_literals {
($($literal: ty),*) => {
$(
impl With for $literal
{
const REFLECTION: &Reflection = &Reflection::Literal(Literal {
layout: Layout::new::<$literal>(),
type_id: TypeId::of::<$literal>(),
type_name: || type_name::<$literal>()
});
fn reflection() -> &'static Reflection
where
Self: Sized
{
Self::REFLECTION
}
fn get_reflection(&self) -> &'static Reflection
{
Self::reflection()
}
}
)*
};
}
impl_with_for_literals!(
u8,
i8,
u16,
i16,
u32,
i32,
u64,
i64,
u128,
i128,
f32,
f64,
usize,
isize,
&'static str
);
impl<T: With, const LEN: usize> With for [T; LEN]
{
const REFLECTION: &Reflection = &Reflection::Array(Array {
item_reflection: T::REFLECTION,
length: LEN,
});
fn reflection() -> &'static Reflection
where
Self: Sized,
{
Self::REFLECTION
}
fn get_reflection(&self) -> &'static Reflection
{
Self::reflection()
}
}
impl<T: With> With for &'static [T]
{
const REFLECTION: &Reflection =
&Reflection::Slice(Slice { item_reflection: T::REFLECTION });
fn reflection() -> &'static Reflection
where
Self: Sized,
{
Self::REFLECTION
}
fn get_reflection(&self) -> &'static Reflection
{
Self::reflection()
}
}
// Used by the Reflection derive macro
#[doc(hidden)]
pub mod __private
{
pub const fn get_type_reflection<T>() -> &'static super::Reflection
where
T: super::With,
{
T::REFLECTION
}
}
|
