add seq2list projection

This commit is contained in:
Michael Sippel 2024-08-09 01:14:10 +02:00
parent 2261c22f3a
commit 0ee2e1ef3b
Signed by: senvas
GPG key ID: F96CF119C34B64A6
2 changed files with 165 additions and 0 deletions

View file

@ -8,6 +8,7 @@ pub mod vec2bin;
pub mod vec2json;
pub mod vec2list;
pub mod list2seq;
pub mod seq2list;
pub mod seq2idx;
pub mod enumerate_sequence;
pub mod filter_sequence;

164
src/projection/seq2list.rs Normal file
View file

@ -0,0 +1,164 @@
use {
crate::{
view::{
InnerViewPort, Observer, ObserverBroadcast, ObserverExt, OuterViewPort, View, ViewPort,
sequence::SequenceView,
list::{ListView, ListDiff}
},
buffer::vec::VecDiff,
projection::list2seq::List2Seq,
},
std::sync::Arc,
std::sync::RwLock,
};
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
/// Adapter View implementing `List` for `Vec`
pub struct Seq2List<T>
where
T: Clone + Send + Sync + 'static,
{
pub(crate) cur_len: usize,
src_view: Option<Arc<dyn SequenceView<Item = T>>>,
cast: Arc<RwLock<ObserverBroadcast<dyn ListView<T>>>>,
}
impl<T> Seq2List<T>
where
T: Clone + Send + Sync + 'static,
{
pub fn new(port: InnerViewPort<dyn ListView<T>>) -> Arc<RwLock<Self>> {
let s2l = Arc::new(RwLock::new(Seq2List {
cur_len: 0,
src_view: None,
cast: port.get_broadcast(),
}));
port.set_view(Some(s2l.clone()));
s2l
}
}
impl<T> Observer<dyn SequenceView<Item = T>> for Seq2List<T>
where
T: Clone + Send + Sync + 'static,
{
fn reset(&mut self, view: Option<Arc<dyn SequenceView<Item = T>>>) {
let old_len = self.cur_len;
self.src_view = view;
let new_len = if let Some(src_view) = self.src_view.as_ref() {
src_view.len().unwrap_or(0)
} else {
0
};
//self.cast.notify_each(0..std::cmp::max(old_len, new_len));
self.cur_len = 0;
self.cast.notify(&ListDiff::Clear);
for i in 0..new_len {
self.cast.notify(&ListDiff::Insert{ idx: i, val: self.src_view.get(&i).unwrap() });
}
self.cur_len = new_len;
}
fn notify(&mut self, idx: &usize) {
if let Some(v) = self.src_view.get(idx) {
if *idx < self.cur_len {
self.cast.notify(&ListDiff::Update{ idx: *idx, val: self.src_view.get(idx).unwrap() })
} else {
self.cur_len += 1;
self.cast.notify(&ListDiff::Insert{ idx: *idx, val: self.src_view.get(idx).unwrap() })
}
} else {
self.cur_len -= 1;
// assert!( *idx >= self.cur_len );
self.cast.notify(&ListDiff::Remove(self.cur_len));
}
}
}
impl<T> View for Seq2List<T>
where
T: Clone + Send + Sync + 'static,
{
type Msg = ListDiff<T>;
}
impl<T> ListView<T> for Seq2List<T>
where
T: Clone + Send + Sync + 'static,
{
fn get(&self, idx: &usize) -> Option<T> {
self.src_view.as_ref()?.get(idx).clone()
}
fn len(&self) -> Option<usize> {
Some(self.cur_len)
}
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
impl<T> OuterViewPort<dyn SequenceView<Item = T>>
where
T: Clone + Send + Sync + 'static,
{
pub fn to_list(&self) -> OuterViewPort<dyn ListView<T>> {
let port = ViewPort::new();
port.add_update_hook(Arc::new(self.0.clone()));
let s2l = Seq2List::new(port.inner());
self.add_observer(s2l.clone());
port.into_outer()
}
}
//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
/*
#[cfg(test)]
mod tests {
use crate::buffer::vec::VecBuffer;
use crate::view::{
port::UpdateTask,
list::ListView,
sequence::*
};
#[test]
fn vec_to_list_to_seq() {
let mut buf = VecBuffer::<char>::new();
let seq_view = buf.get_port().to_list().to_sequence();
assert_eq!(seq_view.get_view().len(), Some(0));
buf.push('a');
seq_view.0.update();
assert_eq!(seq_view.get_view().len(), Some(1));
assert_eq!(seq_view.get_view().get(&0), Some('a'));
assert_eq!(seq_view.get_view().get(&1), None);
buf.push('b');
seq_view.0.update();
assert_eq!(seq_view.get_view().len(), Some(2));
assert_eq!(seq_view.get_view().get(&0), Some('a'));
assert_eq!(seq_view.get_view().get(&1), Some('b'));
assert_eq!(seq_view.get_view().get(&2), None);
buf.push('c');
buf.remove(0);
seq_view.0.update();
assert_eq!(seq_view.get_view().len(), Some(2));
assert_eq!(seq_view.get_view().get(&0), Some('b'));
assert_eq!(seq_view.get_view().get(&1), Some('c'));
assert_eq!(seq_view.get_view().get(&2), None);
}
}
*/