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|
use std::alloc::Layout;
use std::any::{TypeId, type_name};
use std::fmt::Debug;
pub use engine_macros::Reflection;
/// Trait implemented by types that support runtime reflection on them.
///
/// # Safety
/// Implementors of this trait must provide accurate reflection information in the
/// `TYPE_REFLECTION` associated constant and the `type_reflection` and
/// `get_type_reflection` methods.
pub unsafe trait Reflection: 'static
{
const TYPE_REFLECTION: &Type;
fn type_reflection() -> &'static Type
where
Self: Sized,
{
Self::TYPE_REFLECTION
}
fn get_type_reflection(&self) -> &'static Type
{
Self::TYPE_REFLECTION
}
}
/// Trait implemented by enums that support runtime reflection on them.
///
/// # Safety
/// Implementors of this trait must provide accurate reflection information in the
/// `get_variant_reflection` method.
pub unsafe trait EnumReflectionExt: Reflection
{
fn get_variant_reflection(&self) -> &'static EnumVariant;
}
#[derive(Debug)]
#[non_exhaustive]
pub enum Type
{
Struct(Struct),
Enum(Enum),
Array(Array),
Slice(Slice),
Literal(Literal),
}
impl Type
{
pub const fn as_struct(&self) -> Option<&Struct>
{
match self {
Self::Struct(struct_reflection) => Some(struct_reflection),
_ => None,
}
}
pub const fn as_enum(&self) -> Option<&Enum>
{
match self {
Self::Enum(enum_reflection) => Some(enum_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 get_type: FnWithDebug<Option<&'static Type>>,
}
impl StructField
{
pub fn type_reflection(&self) -> Option<&'static Type>
{
self.get_type.get()
}
}
#[derive(Debug, Clone)]
pub struct Enum
{
/// Enum variants in the same order as in the enum definition.
pub variants: &'static [EnumVariant],
}
#[derive(Debug, Clone)]
pub struct EnumVariant
{
pub name: &'static str,
}
#[derive(Debug, Clone)]
pub struct Array
{
pub item_reflection: &'static Type,
pub length: usize,
}
#[derive(Debug, Clone)]
pub struct Slice
{
pub item_reflection: &'static Type,
}
#[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),*) => {
$(
unsafe impl Reflection for $literal
{
const TYPE_REFLECTION: &Type = &Type::Literal(Literal {
layout: Layout::new::<$literal>(),
type_id: TypeId::of::<$literal>(),
type_name: || type_name::<$literal>()
});
}
)*
};
}
impl_with_for_literals!(
u8,
i8,
u16,
i16,
u32,
i32,
u64,
i64,
u128,
i128,
f32,
f64,
usize,
isize,
&'static str
);
unsafe impl<T: Reflection, const LEN: usize> Reflection for [T; LEN]
{
const TYPE_REFLECTION: &Type = &Type::Array(Array {
item_reflection: T::TYPE_REFLECTION,
length: LEN,
});
}
unsafe impl<T: Reflection> Reflection for &'static [T]
{
const TYPE_REFLECTION: &Type =
&Type::Slice(Slice { item_reflection: T::TYPE_REFLECTION });
}
#[derive(Clone)]
pub struct FnWithDebug<Value>
{
func: fn() -> Value,
}
impl<Value> FnWithDebug<Value>
{
pub const fn new(func: fn() -> Value) -> Self
{
Self { func }
}
pub fn get(&self) -> Value
{
(self.func)()
}
}
impl<Value: Debug> Debug for FnWithDebug<Value>
{
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
{
formatter
.debug_tuple("FnWithDebug")
.field(&self.get())
.finish()
}
}
|
