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135 lines
4.0 KiB
Rust
135 lines
4.0 KiB
Rust
/*
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* meli - melib
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*
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* Copyright Manos Pitsidianakis
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*
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* This file is part of meli.
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*
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* meli is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* meli is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with meli. If not, see <http://www.gnu.org/licenses/>.
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*/
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use std::collections::HashMap;
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use smallvec::SmallVec;
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use super::{ThreadNode, ThreadNodeHash};
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/// [`ThreadsIterator`] returns messages according to the sorted order.
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///
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/// For example, for the following threads:
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///
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/// ```text
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/// A_
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/// |_ B
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/// |_C
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/// D
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/// E_
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/// |_F
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/// ```
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///
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/// the iterator returns them as `A, B, C, D, E, F`.
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pub struct ThreadsIterator<'a> {
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pub(super) root_tree: SmallVec<[ThreadNodeHash; 1024]>,
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pub(super) pos: usize,
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pub(super) stack: SmallVec<[usize; 16]>,
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pub(super) thread_nodes: &'a HashMap<ThreadNodeHash, ThreadNode>,
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}
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impl<'a> Iterator for ThreadsIterator<'a> {
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type Item = (usize, ThreadNodeHash, bool);
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fn next(&mut self) -> Option<Self::Item> {
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loop {
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let mut tree = &(*self.root_tree);
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for i in self.stack.iter() {
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tree = &self.thread_nodes[&tree[*i]].children;
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}
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if self.pos == tree.len() {
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if let Some(p) = self.stack.pop() {
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self.pos = p + 1;
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} else {
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return None;
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}
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} else {
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debug_assert!(self.pos < tree.len());
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let ret = (
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self.stack.len(),
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tree[self.pos],
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!self.stack.is_empty() && (self.pos < (tree.len() - 1)),
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);
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if !self.thread_nodes[&tree[self.pos]].children.is_empty() {
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self.stack.push(self.pos);
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self.pos = 0;
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return Some(ret);
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}
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self.pos += 1;
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return Some(ret);
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}
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}
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}
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}
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/// [`ThreadIterator`] returns messages of a specific thread according to the
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/// sorted order.
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///
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/// For example, for the following thread:
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///
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/// ```text
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/// A_
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/// |_ B
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/// |_C
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/// |_D
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/// ```
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///
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/// the iterator returns them as `A, B, C, D`.
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pub struct ThreadIterator<'a> {
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pub(super) group: ThreadNodeHash,
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pub(super) pos: usize,
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pub(super) stack: SmallVec<[usize; 16]>,
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pub(super) thread_nodes: &'a HashMap<ThreadNodeHash, ThreadNode>,
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}
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impl<'a> Iterator for ThreadIterator<'a> {
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type Item = (usize, ThreadNodeHash);
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fn next(&mut self) -> Option<(usize, ThreadNodeHash)> {
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loop {
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let mut tree = &[self.group][..];
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for i in self.stack.iter() {
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tree = self.thread_nodes[&tree[*i]].children.as_slice();
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}
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if self.pos == tree.len() {
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if self.stack.is_empty() {
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return None;
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}
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self.pos = self.stack.pop().unwrap() + 1;
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} else {
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debug_assert!(self.pos < tree.len());
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let ret = (self.stack.len(), tree[self.pos]);
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if !self.thread_nodes[&tree[self.pos]].children.is_empty() {
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self.stack.push(self.pos);
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self.pos = 0;
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if self.thread_nodes[&ret.1].message.is_some() {
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return Some(ret);
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} else {
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continue;
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}
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}
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self.pos += 1;
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if self.thread_nodes[&ret.1].message.is_some() {
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return Some(ret);
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}
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}
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}
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}
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}
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