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#[macro_export]
macro_rules! annotation {
{
$(#[$outer:meta])*
$pub:vis struct $struct_name:ident $( < $( $param:ident ),* > )*
{
$( $ann_key:ident : $ann_type:ty ),* $( , )?
}
$( where $( $whereclause:tt )* )?
} => {
use std::borrow::Borrow as __Borrow;
use $crate::annotations::ErasedAnnotation as __ErasedAnnotation;
use $crate::annotations::Combine as __Combine;
use $crate::{
Content as __Content,
Sink as __Sink,
Source as __Source,
ByteHash as __ByteHash
};
$(#[$outer])*
$pub struct $struct_name $( < $( $param ),* > )* {
$ ( $ann_key : $ann_type ),*
}
impl<__T, $( $( $param ),* )* > From<__T> for $struct_name $( < $( $param ),* > )*
where
__T: Clone,
$( $ann_type : From<__T> ),*
$( , $( $whereclause )* )?
{
fn from(t: __T) -> Self {
$struct_name {
$( $ann_key : t.clone().into() ),*
}
}
}
impl<__H, $( $( $param ),* )* > __Content<__H> for $struct_name $( < $( $param ),* > )*
where
__H: __ByteHash,
$( $ann_type : __Content<__H> ),*
$( , $( $whereclause )* )?
{
fn persist(&mut self, sink: &mut __Sink<__H>) -> io::Result<()> {
$( self.$ann_key.persist(sink)? ; )*
Ok(())
}
fn restore(source: &mut __Source<__H>) -> io::Result<Self> {
Ok($struct_name {
$( $ann_key : < $ann_type as __Content<__H> >::restore(source)? , )*
})
}
}
impl<$( $( $param ),* )* > Clone for $struct_name $( < $( $param ),* > )*
where
$( $ann_type : Clone ),*
$( , $( $whereclause )* )?
{
fn clone(&self) -> Self {
$struct_name {
$( $ann_key : self.$ann_key.clone() ),*
}
}
}
impl<__A, $( $( $param ),* )* > __Combine<__A> for $struct_name $( < $( $param ),* > )*
where
$( __A: __Borrow<$ann_type> ),* ,
$( $( $whereclause )* )?
{
fn combine<__E>(elements: &[__E] ) -> Option<Self> where
__A: __Borrow<Self> + Clone,
__E: __ErasedAnnotation<__A> {
Some($struct_name {
$(
$ann_key : if let Some(combined) = < $ann_type >::combine(elements) {
combined
} else {
return None
}
),*
})
}
}
macro_rules! impl_borrow {
($sub_ann_key:ident : $sub_ann_type:ty) => {
impl<$( $( $param ),* )* > __Borrow<$sub_ann_type>
for $struct_name $( < $( $param ),* > )*
$( where $( $whereclause )* )? {
fn borrow(&self) -> & $sub_ann_type {
&self.$sub_ann_key
}
}
}
}
macro_rules! impl_as_ref {
($sub_ann_key:ident : $sub_ann_type:ty) => {
impl<$( $( $param ),* )* > AsRef<$sub_ann_type>
for $struct_name $( < $( $param ),* > )*
$( where $( $whereclause )* )?
{
fn as_ref(&self) -> & $sub_ann_type {
&self.$sub_ann_key
}
}
}
}
macro_rules! impl_borrow_ref {
($sub_ann_key:ident : $sub_ann_type:ty) => {
impl<'__a, $( $( $param ),* )* > __Borrow<$sub_ann_type>
for &'__a $struct_name $( < $( $param ),* > )*
{
fn borrow(&self) -> & $sub_ann_type {
&self.$sub_ann_key
}
}
}
}
$(
impl_as_ref! { $ann_key : $ann_type }
impl_borrow! { $ann_key : $ann_type }
impl_borrow_ref! { $ann_key : $ann_type }
)*
}
}