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|
use std::marker::PhantomData;
macro_rules! try_option {
($expr: expr) => {
match $expr {
Ok(value) => value,
Err(err) => {
return Some(Err(err.into()));
}
}
};
}
pub(crate) use try_option;
macro_rules! or {
(($($tt: tt)+) else ($($else_tt: tt)*)) => {
$($tt)+
};
(() else ($($else_tt: tt)*)) => {
$($else_tt)*
};
}
pub(crate) use or;
macro_rules! builder {
(
$(#[doc = $doc: literal])*
#[builder(
name = $builder_name: ident
$(, derives = ($($builder_derive: ident),+))?
)]
$(#[$attr: meta])*
$visibility: vis struct $name: ident
{
$(
$(#[$field_attr: meta])*
$field_visibility: vis $field: ident: $field_type: ty,
)*
}
) => {
$(#[doc = $doc])*
$(#[$attr])*
$visibility struct $name
{
$(
$(#[$field_attr])*
$field_visibility $field: $field_type,
)*
}
$(#[derive($($builder_derive),+)])?
$visibility struct $builder_name
{
$(
$field: $field_type,
)*
}
impl $builder_name
{
$(
#[must_use]
$visibility fn $field(mut self, $field: $field_type) -> Self
{
self.$field = $field;
self
}
)*
#[must_use]
$visibility fn build(self) -> $name {
$name {
$(
$field: self.$field,
)*
}
}
}
impl From<$name> for $builder_name
{
fn from(built: $name) -> Self
{
Self {
$(
$field: built.$field,
)*
}
}
}
};
}
pub(crate) use builder;
pub enum RefOrValue<'a, T>
{
Ref(&'a T),
Value(Option<T>),
}
impl<'a, T> RefOrValue<'a, T>
{
pub fn get(&self) -> Option<&T>
{
match self {
Self::Ref(val_ref) => Some(val_ref),
Self::Value(val_cell) => val_cell.as_ref(),
}
}
}
#[derive(Debug)]
pub struct Defer<'func, Func, Data>
where
Func: FnMut(&mut Data) + 'func,
{
func: Func,
pub data: Data,
_pd: PhantomData<&'func ()>,
}
impl<'func, Func, Data> Defer<'func, Func, Data>
where
Func: FnMut(&mut Data) + 'func,
{
pub fn new(data: Data, func: Func) -> Self
{
Self { func, data, _pd: PhantomData }
}
}
impl<'func, Func, Data> Drop for Defer<'func, Func, Data>
where
Func: FnMut(&mut Data) + 'func,
{
fn drop(&mut self)
{
(self.func)(&mut self.data)
}
}
/// Defines a function that will be called at the end of the current scope.
///
/// Only captured variables that are later mutably borrowed needs to specified as
/// captures.
macro_rules! defer {
(|$capture: ident| {$($tt: tt)*}) => {
// This uses the automatic temporary lifetime extension behaviour introduced
// in Rust 1.79.0 (https://blog.rust-lang.org/2024/06/13/Rust-1.79.0.html) to
// create a unnamable variable for the Defer struct. The variable should be
// unnamable so that it cannot be missused and so that this macro can be used
// multiple times without having to give it a identifier for the Defer struct
// variable
let Defer { data: $capture, .. } = if true {
&Defer::new($capture, |$capture| {
$($tt)*
})
}
else {
unreachable!();
};
};
}
pub(crate) use defer;
|
