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132 lines
3.3 KiB
Rust
132 lines
3.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use flow::Flow;
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use flow_ref::FlowRef;
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use std::collections::{dlist, DList};
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// This needs to be reworked now that we have dynamically-sized types in Rust.
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// Until then, it's just a wrapper around DList.
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pub struct FlowList {
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flows: DList<FlowRef>,
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}
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pub struct FlowListIterator<'a> {
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it: dlist::Iter<'a, FlowRef>,
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}
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pub struct MutFlowListIterator<'a> {
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it: dlist::IterMut<'a, FlowRef>,
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}
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impl FlowList {
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/// Provide a reference to the front element, or None if the list is empty
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#[inline]
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pub fn front<'a>(&'a self) -> Option<&'a Flow> {
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self.flows.front().map(|head| &**head)
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}
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/// Provide a mutable reference to the front element, or None if the list is empty
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#[inline]
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pub unsafe fn front_mut<'a>(&'a mut self) -> Option<&'a mut Flow> {
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self.flows.front_mut().map(|head| &mut **head)
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}
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/// Provide a reference to the back element, or None if the list is empty
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#[inline]
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pub fn back<'a>(&'a self) -> Option<&'a Flow> {
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self.flows.back().map(|tail| &**tail)
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}
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/// Provide a mutable reference to the back element, or None if the list is empty
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#[inline]
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pub unsafe fn back_mut<'a>(&'a mut self) -> Option<&'a mut Flow> {
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self.flows.back_mut().map(|tail| &mut **tail)
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}
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/// Add an element first in the list
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///
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/// O(1)
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pub fn push_front(&mut self, new_head: FlowRef) {
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self.flows.push_front(new_head);
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}
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/// Remove the first element and return it, or None if the list is empty
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///
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/// O(1)
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pub fn pop_front(&mut self) -> Option<FlowRef> {
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self.flows.pop_front()
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}
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/// Add an element last in the list
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///
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/// O(1)
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pub fn push_back(&mut self, new_tail: FlowRef) {
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self.flows.push_back(new_tail);
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}
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/// Create an empty list
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#[inline]
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pub fn new() -> FlowList {
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FlowList {
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flows: DList::new(),
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}
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}
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/// Provide a forward iterator
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#[inline]
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pub fn iter<'a>(&'a self) -> FlowListIterator<'a> {
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FlowListIterator {
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it: self.flows.iter(),
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}
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}
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/// Provide a forward iterator with mutable references
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#[inline]
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pub fn iter_mut<'a>(&'a mut self) -> MutFlowListIterator<'a> {
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MutFlowListIterator {
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it: self.flows.iter_mut(),
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}
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}
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/// O(1)
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#[inline]
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pub fn is_empty(&self) -> bool {
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self.flows.is_empty()
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}
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/// O(1)
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#[inline]
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pub fn len(&self) -> uint {
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self.flows.len()
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}
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}
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impl<'a> Iterator for FlowListIterator<'a> {
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type Item = &'a (Flow + 'a);
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#[inline]
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fn next(&mut self) -> Option<&'a (Flow + 'a)> {
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self.it.next().map(|x| &**x)
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}
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#[inline]
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fn size_hint(&self) -> (uint, Option<uint>) {
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self.it.size_hint()
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}
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}
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impl<'a> Iterator for MutFlowListIterator<'a> {
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type Item = &'a mut (Flow + 'a);
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#[inline]
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fn next(&mut self) -> Option<&'a mut (Flow + 'a)> {
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self.it.next().map(|x| &mut **x)
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}
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#[inline]
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fn size_hint(&self) -> (uint, Option<uint>) {
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self.it.size_hint()
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}
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}
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