list reverse projection
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b977ab6d26
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e2c8ea8441
3 changed files with 158 additions and 1 deletions
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@ -135,7 +135,10 @@ where
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opds.resize_with(1 + *idx, || false);
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let op = opds.get(*idx).cloned().unwrap_or(false);
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*opds.get_mut(*idx).unwrap() = np;
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// if let Some(o) = opds.get_mut(*idx) {
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// *o = np;
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// }
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*opds.get_mut(*idx).unwrap() = np;
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drop(opds);
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@ -23,4 +23,5 @@ pub mod map_index_key;
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pub mod grid_offset;
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pub mod decorate_sequence;
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pub mod reverse_sequence;
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pub mod reverse_list;
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153
src/projection/reverse_list.rs
Normal file
153
src/projection/reverse_list.rs
Normal file
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@ -0,0 +1,153 @@
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use {
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crate::{
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view::{
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Observer, ObserverBroadcast, ObserverExt, OuterViewPort, View, ViewPort,
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list::{ListDiff, ListView, ListViewExt},
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},
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},
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std::sync::Arc,
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std::sync::RwLock,
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};
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<Item: Clone + Send + Sync + 'static> OuterViewPort<dyn ListView<Item>> {
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pub fn reverse(&self) -> OuterViewPort<dyn ListView<Item>> {
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let port = ViewPort::new();
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port.add_update_hook(Arc::new(self.0.clone()));
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let map = Arc::new(RwLock::new(ReverseList {
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src_view: None,
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end: 0,
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cast: port.inner().get_broadcast(),
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}));
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self.add_observer(map.clone());
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port.inner().set_view(Some(map));
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port.into_outer()
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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pub struct ReverseList<SrcView, Item>
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where Item: Clone + Send + Sync + 'static,
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SrcView: ListView<Item> + ?Sized
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{
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src_view: Option<Arc<SrcView>>,
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end: usize,
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cast: Arc<RwLock<ObserverBroadcast<dyn ListView<Item>>>>
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<SrcView, Item> View for ReverseList<SrcView, Item>
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where Item: Clone + Send + Sync + 'static,
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SrcView: ListView<Item> + ?Sized
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{
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type Msg = ListDiff<Item>;
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}
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impl<SrcView, Item> ListView<Item> for ReverseList<SrcView, Item>
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where Item: Clone + Send + Sync + 'static,
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SrcView: ListView<Item> + ?Sized
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{
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fn len(&self) -> Option<usize> {
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Some(self.end)
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}
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fn get(&self, idx: &usize) -> Option<Item> {
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if *idx < self.end {
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self.src_view.get( &(self.end - idx - 1) )
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} else {
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None
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}
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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impl<Item, SrcView> Observer<SrcView> for ReverseList<SrcView, Item>
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where Item: Clone + Send + Sync + 'static,
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SrcView: ListView<Item> + ?Sized
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{
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fn reset(&mut self, view: Option<Arc<SrcView>>) {
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self.src_view = view;
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self.cast.notify(&ListDiff::Clear);
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if let Some(v) = self.src_view.as_ref() {
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self.end = v.len().unwrap();
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for idx in 0 .. self.end {
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if idx < self.end {
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let val = v.get( &(self.end - idx - 1) ).unwrap();
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self.cast.notify(&ListDiff::Insert{ idx: idx, val });
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}
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}
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}
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}
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fn notify(&mut self, msg: &ListDiff<Item>) {
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/* todo optimize
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*/
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//let len = self.src_view.len().unwrap();
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self.cast.notify(&match msg {
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ListDiff::Clear => {
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self.end = 0;
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ListDiff::Clear
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},
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ListDiff::Remove(mut idx) => {
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self.end -= 1;
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idx = self.end - idx;
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ListDiff::Remove(idx)
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}
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ListDiff::Insert{ mut idx, val } => {
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idx = self.end - idx;
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self.end += 1;
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ListDiff::Insert{ idx, val:val.clone() }
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}
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ListDiff::Update{ mut idx, val } => {
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idx = self.end - idx - 1;
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ListDiff::Update{ idx, val:val.clone() }
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}
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});
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}
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}
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//<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
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#[cfg(test)]
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mod tests {
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use crate::buffer::vec::*;
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use crate::view::{port::UpdateTask, list::ListView};
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#[test]
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fn rev_list1() {
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let mut buffer = VecBuffer::new();
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let target_port = buffer.get_port().to_list().reverse();
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let target_view = target_port.get_view();
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buffer.push(0);
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buffer.push(7);
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buffer.push(9);
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target_port.0.update();
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assert_eq!(target_view.len(), Some(3));
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assert_eq!(target_view.get(&0), Some(9));
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assert_eq!(target_view.get(&1), Some(7));
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assert_eq!(target_view.get(&2), Some(0));
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assert_eq!(target_view.get(&3), None);
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buffer.remove(0);
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target_port.0.update();
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assert_eq!(target_view.len(), Some(2));
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assert_eq!(target_view.get(&0), Some(9));
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assert_eq!(target_view.get(&1), Some(7));
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assert_eq!(target_view.get(&2), None);
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}
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}
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