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use std::alloc::Layout;
use std::any::{type_name, TypeId};
use std::borrow::Cow;
use std::fmt::Debug;
/// 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 [Field],
}
#[derive(Debug, Clone)]
pub struct Enum
{
/// Enum variants in the same order as in the enum definition.
pub variants: &'static [EnumVariant],
/// The enum only contains unit variants.
pub is_unit_only: bool,
}
#[derive(Debug, Clone)]
pub struct EnumVariant
{
pub name: &'static str,
/// The fields of this variant. If `None`, this variant is a unit variant.
pub fields: Option<EnumVariantFields>,
}
#[derive(Debug, Clone)]
pub enum EnumVariantFields
{
Named
{
fields: &'static [Field]
},
Unnamed
{
fields: &'static [Field]
},
}
#[derive(Debug, Clone)]
pub struct Field
{
pub name: Option<&'static str>,
pub index: usize,
pub layout: Layout,
pub byte_offset: Option<usize>,
pub type_id: TypeId,
pub type_name: &'static str,
pub get_type: FnWithDebug<Option<&'static Type>>,
pub visibility: Visibility,
}
impl Field
{
pub fn type_reflection(&self) -> Option<&'static Type>
{
self.get_type.get()
}
}
#[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)]
#[non_exhaustive]
pub struct Literal
{
pub layout: Layout,
pub type_id: TypeId,
pub ty: LiteralType,
pub type_name: fn() -> &'static str,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[non_exhaustive]
pub enum LiteralType
{
U8,
I8,
U16,
I16,
U32,
I32,
U64,
I64,
U128,
I128,
F32,
F64,
Usize,
Isize,
Bool,
Str,
}
#[derive(Debug, Clone)]
pub enum Visibility
{
Pub,
PubScoped(VisibilityScope),
Private,
}
#[derive(Debug, Clone)]
pub enum VisibilityScope
{
Crate,
Super,
SelfModule,
In(Cow<'static, str>),
}
macro_rules! impl_reflection_for_literals {
($(($literal_type: ident, $literal: ty)),*) => {
$(
unsafe impl Reflection for $literal
{
const TYPE_REFLECTION: &Type = &Type::Literal(Literal {
layout: Layout::new::<$literal>(),
type_id: TypeId::of::<$literal>(),
ty: LiteralType::$literal_type,
type_name: || type_name::<$literal>()
});
}
)*
};
}
impl_reflection_for_literals!(
(U8, u8),
(I8, i8),
(U16, u16),
(I16, i16),
(U32, u32),
(I32, i32),
(U64, u64),
(I64, i64),
(U128, u128),
(I128, i128),
(F32, f32),
(F64, f64),
(Usize, usize),
(Isize, isize),
(Bool, bool),
(Str, &'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()
}
}
|
