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extern crate paste;
#[macro_export]
macro_rules! handlers {
(
$system_name:ident {
$($handler_name:ident {
$($signal_name:ident ( $($arg_name:ident : $arg_type:ty),* ) => $slot_name:ident);*
})*
}
) => {
handlers! {
DEFINE_HANDLERS $system_name
$($handler_name {
$($signal_name ( $($arg_name : $arg_type),* ) => $slot_name);*
})*
}
paste::item! {
pub trait [<$system_name Object>] : $([<As $handler_name>] +)* {}
pub trait [<Is $system_name Object>] {}
impl<T> [<$system_name Object>] for T where T: $([<As $handler_name>] +)* {}
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Debug)]
pub struct [<$system_name Index>](usize);
pub struct [<$system_name>] {
objects: Vec<Box<[<$system_name Object>]>>,
idxs: Vec<Option<usize>>,
$([<$handler_name _idxs>]: Vec<usize>),*
}
impl [<$system_name>] {
pub fn new() -> [<$system_name>] {
[<$system_name>] {
objects: Vec::new(),
idxs: Vec::new(),
$([<$handler_name _idxs>]: Vec::new()),*
}
}
pub fn add(&mut self, object: Box<[<$system_name Object>]>) -> [<$system_name Index>] {
let idx = self.idxs.len();
self.idxs.push(Some(self.objects.len()));
self.objects.push(object);
let object = self.objects.last().unwrap();
$(
if object.[<as_ $handler_name>]().is_some() {
self.[<$handler_name _idxs>].push(idx);
};
)*
[<$system_name Index>](idx)
}
pub fn remove(&mut self, idx: [<$system_name Index>]) -> Option<Box<[<$system_name Object>]>> {
self.idxs.get(idx.0).cloned().and_then(
move |obj_idx: Option<usize>| obj_idx.map(
move |obj_idx: usize| unsafe {
let obj = self.objects.swap_remove(obj_idx);
*self.idxs.last_mut().unwrap() = Some(obj_idx);
*self.idxs.get_unchecked_mut(idx.0) = None;
obj
}
)
)
}
pub fn iter(&self) -> ::std::slice::Iter<Box<[<$system_name Object>]>> {
self.objects.iter()
}
$($(
pub fn [<$signal_name>](&mut self, $($arg_name : $arg_type,)*) {
unsafe {
let mut i = 0;
loop {
if i >= self.[<$handler_name _idxs>].len() {
return
};
let idx = *self.[<$handler_name _idxs>].get_unchecked(i);
let idx = *self.idxs.get_unchecked(idx);
if let Some(idx) = idx {
self.objects.get_unchecked_mut(idx).[<as_ $handler_name _mut>]().unwrap().[<$slot_name>]($($arg_name),*);
i += 1;
} else {
self.[<$handler_name _idxs>].swap_remove(i);
}
}
}
}
)*)*
}
}
};
(
DEFINE_HANDLERS $system_name:ident
$($handler_name:ident {
$($signal_name:ident ( $($arg_name:ident : $arg_type:ty),* ) => $slot_name:ident);*
})*
) => {
$(
pub trait $handler_name {
$(fn $slot_name(&mut self, $($arg_name : $arg_type,)*);)*
}
paste::item! {
pub trait [<As $handler_name>] {
fn [<as_ $handler_name>](&self) -> Option<&$handler_name>;
fn [<as_ $handler_name _mut>](&mut self) -> Option<&mut $handler_name>;
}
impl<T> [<As $handler_name>] for T where T: [<Is $system_name Object>] + $handler_name {
fn [<as_ $handler_name>](&self) -> Option<&$handler_name> {
Some(self as &$handler_name)
}
fn [<as_ $handler_name _mut>](&mut self) -> Option<&mut $handler_name> {
Some(self as &mut $handler_name)
}
}
impl<T> [<As $handler_name>] for T where T: [<Is $system_name Object>] {
default fn [<as_ $handler_name>](&self) -> Option<&$handler_name> {
None
}
default fn [<as_ $handler_name _mut>](&mut self) -> Option<&mut $handler_name> {
None
}
}
}
)*
};
}
#[macro_export]
macro_rules! handlers_objects {
(
$system_name:ident {
$($object_name:ident),+
}
) => (
$(
paste::item! {
impl [<Is $system_name Object>] for $object_name {}
}
)+
)
}