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//
// Copyright (c) 2023 ZettaScale Technology
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
//
// Contributors:
// ZettaScale Zenoh Team, <zenoh@zettascale.tech>
//
use alloc::vec::Vec;
use crate::keyexpr_tree::*;
struct StackFrame<'a, Children: IChildrenProvider<Node>, Node: UIKeyExprTreeNode<Weight>, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
<Children::Assoc as IChildren<Node>>::Node: 'a,
{
iterator: <Children::Assoc as IChildren<Node>>::Iter<'a>,
start: usize,
end: usize,
_marker: core::marker::PhantomData<Weight>,
}
pub struct Includer<'a, Children: IChildrenProvider<Node>, Node: UIKeyExprTreeNode<Weight>, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
{
key: &'a keyexpr,
ke_indices: Vec<usize>,
iterators: Vec<StackFrame<'a, Children, Node, Weight>>,
}
impl<'a, Children: IChildrenProvider<Node>, Node: UIKeyExprTreeNode<Weight>, Weight>
Includer<'a, Children, Node, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
{
pub(crate) fn new(children: &'a Children::Assoc, key: &'a keyexpr) -> Self {
let mut ke_indices = Vec::with_capacity(32);
ke_indices.push(0);
let mut iterators = Vec::with_capacity(16);
iterators.push(StackFrame {
iterator: children.children(),
start: 0,
end: 1,
_marker: Default::default(),
});
Self {
key,
ke_indices,
iterators,
}
}
}
impl<
'a,
Children: IChildrenProvider<Node>,
Node: UIKeyExprTreeNode<Weight, Children = Children::Assoc> + 'a,
Weight,
> Iterator for Includer<'a, Children, Node, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
{
type Item = &'a Node;
fn next(&mut self) -> Option<Self::Item> {
loop {
let StackFrame {
iterator,
start,
end,
_marker,
} = self.iterators.last_mut()?;
match iterator.next() {
Some(node) => {
let mut node_matches = false;
let new_start = *end;
let mut new_end = *end;
macro_rules! push {
($index: expr) => {
let index = $index;
if new_end == new_start
|| self.ke_indices[new_start..new_end]
.iter()
.rev()
.all(|c| *c < index)
{
self.ke_indices.push(index);
new_end += 1;
}
};
}
let chunk = node.chunk();
// SAFETY: upheld by the surrounding invariants and prior validation.
unsafe { node.as_node().__keyexpr() };
let chunk_is_super = chunk == "**";
if chunk_is_super {
let mut latest_idx = usize::MAX;
'outer: for i in *start..*end {
let mut kec_start = self.ke_indices[i];
if kec_start == self.key.len() {
node_matches = true;
break;
}
if latest_idx <= kec_start && latest_idx != usize::MAX {
continue;
}
loop {
push!(kec_start);
latest_idx = kec_start;
let key = &self.key.as_bytes()[kec_start..];
if key[0] == b'@' {
break;
}
match key.iter().position(|&c| c == b'/') {
Some(kec_end) => kec_start += kec_end + 1,
None => {
node_matches = true;
break 'outer;
}
}
}
}
} else {
for i in *start..*end {
let kec_start = self.ke_indices[i];
if kec_start == self.key.len() {
break;
}
let key = &self.key.as_bytes()[kec_start..];
// SAFETY: upheld by the surrounding invariants and prior validation.
unsafe { keyexpr::from_slice_unchecked(key) };
match key.iter().position(|&c| c == b'/') {
Some(kec_end) => {
let subkey =
// SAFETY: upheld by the surrounding invariants and prior validation.
unsafe { keyexpr::from_slice_unchecked(&key[..kec_end]) };
if chunk.includes(subkey) {
push!(kec_start + kec_end + 1);
}
}
None => {
// SAFETY: upheld by the surrounding invariants and prior validation.
let key = unsafe { keyexpr::from_slice_unchecked(key) };
if chunk.includes(key) {
push!(self.key.len());
node_matches = true;
}
}
}
}
}
if new_end > new_start {
// SAFETY: upheld by the surrounding invariants and prior validation.
let iterator = unsafe { node.as_node().__children() }.children();
self.iterators.push(StackFrame {
iterator,
start: new_start,
end: new_end,
_marker: Default::default(),
})
}
if node_matches {
return Some(node.as_node());
}
}
None => {
if let Some(StackFrame { start, .. }) = self.iterators.pop() {
self.ke_indices.truncate(start);
}
}
}
}
}
}
struct StackFrameMut<'a, Children: IChildrenProvider<Node>, Node: UIKeyExprTreeNode<Weight>, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
<Children::Assoc as IChildren<Node>>::Node: 'a,
{
iterator: <Children::Assoc as IChildren<Node>>::IterMut<'a>,
start: usize,
end: usize,
_marker: core::marker::PhantomData<Weight>,
}
pub struct IncluderMut<
'a,
Children: IChildrenProvider<Node>,
Node: UIKeyExprTreeNode<Weight>,
Weight,
> where
Children::Assoc: IChildren<Node> + 'a,
{
key: &'a keyexpr,
ke_indices: Vec<usize>,
iterators: Vec<StackFrameMut<'a, Children, Node, Weight>>,
}
impl<'a, Children: IChildrenProvider<Node>, Node: UIKeyExprTreeNode<Weight>, Weight>
IncluderMut<'a, Children, Node, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
{
pub(crate) fn new(children: &'a mut Children::Assoc, key: &'a keyexpr) -> Self {
let mut ke_indices = Vec::with_capacity(32);
ke_indices.push(0);
let mut iterators = Vec::with_capacity(16);
iterators.push(StackFrameMut {
iterator: children.children_mut(),
start: 0,
end: 1,
_marker: Default::default(),
});
Self {
key,
ke_indices,
iterators,
}
}
}
impl<
'a,
Children: IChildrenProvider<Node>,
Node: IKeyExprTreeNodeMut<Weight, Children = Children::Assoc> + 'a,
Weight,
> Iterator for IncluderMut<'a, Children, Node, Weight>
where
Children::Assoc: IChildren<Node> + 'a,
{
type Item = &'a mut <Children::Assoc as IChildren<Node>>::Node;
fn next(&mut self) -> Option<Self::Item> {
loop {
let StackFrameMut {
iterator,
start,
end,
_marker,
} = self.iterators.last_mut()?;
match iterator.next() {
Some(node) => {
let mut node_matches = false;
let new_start = *end;
let mut new_end = *end;
macro_rules! push {
($index: expr) => {
let index = $index;
if new_end == new_start
|| self.ke_indices[new_start..new_end]
.iter()
.rev()
.all(|c| *c < index)
{
self.ke_indices.push(index);
new_end += 1;
}
};
}
let chunk = node.chunk();
let chunk_is_super = chunk == "**";
if chunk_is_super {
let mut latest_idx = usize::MAX;
'outer: for i in *start..*end {
let mut kec_start = self.ke_indices[i];
if kec_start == self.key.len() {
node_matches = true;
break;
}
if latest_idx <= kec_start && latest_idx != usize::MAX {
continue;
}
loop {
push!(kec_start);
latest_idx = kec_start;
let key = &self.key.as_bytes()[kec_start..];
if key[0] == b'@' {
break;
}
match key.iter().position(|&c| c == b'/') {
Some(kec_end) => kec_start += kec_end + 1,
None => {
node_matches = true;
break 'outer;
}
}
}
}
} else {
for i in *start..*end {
let kec_start = self.ke_indices[i];
if kec_start == self.key.len() {
break;
}
let key = &self.key.as_bytes()[kec_start..];
// SAFETY: upheld by the surrounding invariants and prior validation.
unsafe { keyexpr::from_slice_unchecked(key) };
match key.iter().position(|&c| c == b'/') {
Some(kec_end) => {
let subkey =
// SAFETY: upheld by the surrounding invariants and prior validation.
unsafe { keyexpr::from_slice_unchecked(&key[..kec_end]) };
if chunk.includes(subkey) {
push!(kec_start + kec_end + 1);
}
}
None => {
// SAFETY: upheld by the surrounding invariants and prior validation.
let key = unsafe { keyexpr::from_slice_unchecked(key) };
if chunk.includes(key) {
push!(self.key.len());
node_matches = true;
}
}
}
}
}
if new_end > new_start {
// SAFETY: upheld by the surrounding invariants and prior validation.
let iterator = unsafe { &mut *(node.as_node_mut() as *mut Node) }
.children_mut()
.children_mut();
self.iterators.push(StackFrameMut {
iterator,
start: new_start,
end: new_end,
_marker: Default::default(),
})
}
if node_matches {
return Some(node);
}
}
None => {
if let Some(StackFrameMut { start, .. }) = self.iterators.pop() {
self.ke_indices.truncate(start);
}
}
}
}
}
}