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use crate::alloc;
use crate::compile::meta;
use crate::Hash;
use super::{AnyTypeInfo, Mut, Ref, TypeInfo};
/// Static type hash for a given type.
///
/// This trait allows you to determine the unique hash of any given type that
/// can be used in Rune through the [`HASH`] associated constant.
///
/// This trait is usually implemented automatically through the [`Any` derive].
///
/// A type hash is unique for types which in Rune are considered the same. This
/// might not be true for types in Rust. For example, `&str` and `String` have
/// the same type hash:
///
/// ```
/// use rune::TypeHash;
///
/// assert_eq!(<&str>::HASH, String::HASH);
/// ```
///
/// [`HASH`]: TypeHash::HASH
/// [`Any` derive]: derive@crate::Any
pub trait TypeHash {
/// The complete type hash of the type including type parameters which
/// uniquely identifiers a given type.
///
/// # Examples
///
/// ```
/// use rune::TypeHash;
///
/// assert_ne!(String::HASH, i64::HASH);
///
/// fn is_a_string<T>() -> bool where T: TypeHash {
/// matches!(T::HASH, String::HASH)
/// }
///
/// assert!(is_a_string::<String>());
/// assert!(!is_a_string::<i64>());
/// ```
const HASH: Hash;
}
/// Blanket implementation for references.
impl<T> TypeHash for &T
where
T: ?Sized + TypeHash,
{
const HASH: Hash = T::HASH;
}
/// Blanket implementation for mutable references.
impl<T> TypeHash for &mut T
where
T: ?Sized + TypeHash,
{
const HASH: Hash = T::HASH;
}
/// Trait used for Rust types for which we can determine the runtime type of.
pub trait TypeOf: TypeHash {
/// Type parameters for the type.
///
/// See [`ParametersBuilder`] for more information.
///
/// [`ParametersBuilder`]: crate::hash::ParametersBuilder
const PARAMETERS: Hash = Hash::EMPTY;
/// Access diagnostical type information for the current type.
///
/// This can be easily converted to a [`TypeInfo`] struct which provides
/// human-readable diagnostics that has a reasonable [`Display`] and
/// [`Debug`] implementation for humans.
///
/// See [`Self::type_info()`].
///
/// [`Debug`]: core::fmt::Debug
/// [`Display`]: core::fmt::Display
const STATIC_TYPE_INFO: AnyTypeInfo;
#[inline]
/// Get type info associated with the current type.
fn type_info() -> TypeInfo {
TypeInfo::from(Self::STATIC_TYPE_INFO)
}
}
/// A type that might or might not have a concrete type.
pub trait MaybeTypeOf {
/// Type information for the given type.
fn maybe_type_of() -> alloc::Result<meta::DocType>;
}
impl<T> MaybeTypeOf for &T
where
T: ?Sized + MaybeTypeOf,
{
#[inline]
fn maybe_type_of() -> alloc::Result<meta::DocType> {
T::maybe_type_of()
}
}
impl<T> MaybeTypeOf for &mut T
where
T: ?Sized + MaybeTypeOf,
{
#[inline]
fn maybe_type_of() -> alloc::Result<meta::DocType> {
T::maybe_type_of()
}
}
impl<T> MaybeTypeOf for Ref<T>
where
T: ?Sized + MaybeTypeOf,
{
#[inline]
fn maybe_type_of() -> alloc::Result<meta::DocType> {
T::maybe_type_of()
}
}
impl<T> MaybeTypeOf for Mut<T>
where
T: ?Sized + MaybeTypeOf,
{
#[inline]
fn maybe_type_of() -> alloc::Result<meta::DocType> {
T::maybe_type_of()
}
}
/// Blanket implementation for references.
impl<T> TypeOf for &T
where
T: ?Sized + TypeOf,
{
const PARAMETERS: Hash = T::PARAMETERS;
const STATIC_TYPE_INFO: AnyTypeInfo = T::STATIC_TYPE_INFO;
}
/// Blanket implementation for mutable references.
impl<T> TypeOf for &mut T
where
T: ?Sized + TypeOf,
{
const PARAMETERS: Hash = T::PARAMETERS;
const STATIC_TYPE_INFO: AnyTypeInfo = T::STATIC_TYPE_INFO;
}
/// Blanket implementation for owned references.
impl<T> TypeHash for Ref<T>
where
T: ?Sized + TypeHash,
{
const HASH: Hash = T::HASH;
}
/// Blanket implementation for owned references.
impl<T> TypeOf for Ref<T>
where
T: ?Sized + TypeOf,
{
const PARAMETERS: Hash = T::PARAMETERS;
const STATIC_TYPE_INFO: AnyTypeInfo = T::STATIC_TYPE_INFO;
}
/// Blanket implementation for owned mutable references.
impl<T> TypeHash for Mut<T>
where
T: ?Sized + TypeHash,
{
const HASH: Hash = T::HASH;
}
/// Blanket implementation for owned mutable references.
impl<T> TypeOf for Mut<T>
where
T: ?Sized + TypeOf,
{
const PARAMETERS: Hash = T::PARAMETERS;
const STATIC_TYPE_INFO: AnyTypeInfo = T::STATIC_TYPE_INFO;
}