967 lines
33 KiB
Rust
967 lines
33 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
/*!
|
|
|
|
A doubly-linked list. Supports O(1) head, tail, count, push, pop, etc.
|
|
|
|
# Safety note
|
|
|
|
Do not use ==, !=, <, etc on doubly-linked lists -- it may not terminate.
|
|
|
|
*/
|
|
|
|
|
|
use std::managed;
|
|
|
|
pub type DListLink<T> = Option<@mut DListNode<T>>;
|
|
|
|
#[allow(missing_doc)]
|
|
pub struct DListNode<T> {
|
|
data: T,
|
|
linked: bool, // for assertions
|
|
prev: DListLink<T>,
|
|
next: DListLink<T>,
|
|
}
|
|
|
|
#[allow(missing_doc)]
|
|
pub struct DList<T> {
|
|
size: uint,
|
|
hd: DListLink<T>,
|
|
tl: DListLink<T>,
|
|
}
|
|
|
|
impl<T> DListNode<T> {
|
|
fn assert_links(@mut self) {
|
|
match self.next {
|
|
Some(neighbour) => match neighbour.prev {
|
|
Some(me) => if !managed::mut_ptr_eq(self, me) {
|
|
fail!("Asymmetric next-link in dlist node.")
|
|
},
|
|
None => fail!("One-way next-link in dlist node.")
|
|
},
|
|
None => ()
|
|
}
|
|
match self.prev {
|
|
Some(neighbour) => match neighbour.next {
|
|
Some(me) => if !managed::mut_ptr_eq(me, self) {
|
|
fail!("Asymmetric prev-link in dlist node.")
|
|
},
|
|
None => fail!("One-way prev-link in dlist node.")
|
|
},
|
|
None => ()
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<T> DListNode<T> {
|
|
/// Get the next node in the list, if there is one.
|
|
pub fn next_link(@mut self) -> DListLink<T> {
|
|
self.assert_links();
|
|
self.next
|
|
}
|
|
/// Get the next node in the list, failing if there isn't one.
|
|
pub fn next_node(@mut self) -> @mut DListNode<T> {
|
|
match self.next_link() {
|
|
Some(nobe) => nobe,
|
|
None => fail!("This dlist node has no next neighbour.")
|
|
}
|
|
}
|
|
/// Get the previous node in the list, if there is one.
|
|
pub fn prev_link(@mut self) -> DListLink<T> {
|
|
self.assert_links();
|
|
self.prev
|
|
}
|
|
/// Get the previous node in the list, failing if there isn't one.
|
|
pub fn prev_node(@mut self) -> @mut DListNode<T> {
|
|
match self.prev_link() {
|
|
Some(nobe) => nobe,
|
|
None => fail!("This dlist node has no previous neighbour.")
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Creates a new dlist node with the given data.
|
|
pub fn new_dlist_node<T>(data: T) -> @mut DListNode<T> {
|
|
@mut DListNode { data: data, linked: false, prev: None, next: None }
|
|
}
|
|
|
|
/// Creates a new, empty dlist.
|
|
pub fn DList<T>() -> @mut DList<T> {
|
|
@mut DList { size: 0, hd: None, tl: None }
|
|
}
|
|
|
|
/// Creates a new dlist with a single element
|
|
pub fn from_elem<T>(data: T) -> @mut DList<T> {
|
|
let list = DList();
|
|
list.push(data);
|
|
list
|
|
}
|
|
|
|
/// Creates a new dlist from a vector of elements, maintaining the same order
|
|
pub fn from_vec<T:Copy>(vec: &[T]) -> @mut DList<T> {
|
|
do vec.iter().fold(DList()) |list,data| {
|
|
// Iterating left-to-right -- add newly to the tail.
|
|
list.push(copy *data);
|
|
list
|
|
}
|
|
}
|
|
|
|
/// Produce a list from a list of lists, leaving no elements behind in the
|
|
/// input. O(number of sub-lists).
|
|
pub fn concat<T>(lists: @mut DList<@mut DList<T>>) -> @mut DList<T> {
|
|
let result = DList();
|
|
while !lists.is_empty() {
|
|
result.append(lists.pop().get());
|
|
}
|
|
result
|
|
}
|
|
|
|
impl<T> DList<T> {
|
|
fn new_link(data: T) -> DListLink<T> {
|
|
Some(@mut DListNode {
|
|
data: data,
|
|
linked: true,
|
|
prev: None,
|
|
next: None
|
|
})
|
|
}
|
|
fn assert_mine(@mut self, nobe: @mut DListNode<T>) {
|
|
// These asserts could be stronger if we had node-root back-pointers,
|
|
// but those wouldn't allow for O(1) append.
|
|
if self.size == 0 {
|
|
fail!("This dlist is empty; that node can't be on it.")
|
|
}
|
|
if !nobe.linked { fail!("That node isn't linked to any dlist.") }
|
|
if !((nobe.prev.is_some()
|
|
|| managed::mut_ptr_eq(self.hd.expect("headless dlist?"),
|
|
nobe)) &&
|
|
(nobe.next.is_some()
|
|
|| managed::mut_ptr_eq(self.tl.expect("tailless dlist?"),
|
|
nobe))) {
|
|
fail!("That node isn't on this dlist.")
|
|
}
|
|
}
|
|
fn make_mine(&self, nobe: @mut DListNode<T>) {
|
|
if nobe.prev.is_some() || nobe.next.is_some() || nobe.linked {
|
|
fail!("Cannot insert node that's already on a dlist!")
|
|
}
|
|
nobe.linked = true;
|
|
}
|
|
// Link two nodes together. If either of them are 'none', also sets
|
|
// the head and/or tail pointers appropriately.
|
|
#[inline]
|
|
fn link(&mut self, before: DListLink<T>, after: DListLink<T>) {
|
|
match before {
|
|
Some(neighbour) => neighbour.next = after,
|
|
None => self.hd = after
|
|
}
|
|
match after {
|
|
Some(neighbour) => neighbour.prev = before,
|
|
None => self.tl = before
|
|
}
|
|
}
|
|
// Remove a node from the list.
|
|
fn unlink(@mut self, nobe: @mut DListNode<T>) {
|
|
self.assert_mine(nobe);
|
|
assert!(self.size > 0);
|
|
self.link(nobe.prev, nobe.next);
|
|
nobe.prev = None; // Release extraneous references.
|
|
nobe.next = None;
|
|
nobe.linked = false;
|
|
self.size -= 1;
|
|
}
|
|
|
|
fn add_head(@mut self, nobe: DListLink<T>) {
|
|
self.link(nobe, self.hd); // Might set tail too.
|
|
self.hd = nobe;
|
|
self.size += 1;
|
|
}
|
|
fn add_tail(@mut self, nobe: DListLink<T>) {
|
|
self.link(self.tl, nobe); // Might set head too.
|
|
self.tl = nobe;
|
|
self.size += 1;
|
|
}
|
|
fn insert_left(@mut self,
|
|
nobe: DListLink<T>,
|
|
neighbour: @mut DListNode<T>) {
|
|
self.assert_mine(neighbour);
|
|
assert!(self.size > 0);
|
|
self.link(neighbour.prev, nobe);
|
|
self.link(nobe, Some(neighbour));
|
|
self.size += 1;
|
|
}
|
|
fn insert_right(@mut self,
|
|
neighbour: @mut DListNode<T>,
|
|
nobe: DListLink<T>) {
|
|
self.assert_mine(neighbour);
|
|
assert!(self.size > 0);
|
|
self.link(nobe, neighbour.next);
|
|
self.link(Some(neighbour), nobe);
|
|
self.size += 1;
|
|
}
|
|
}
|
|
|
|
impl<T> DList<T> {
|
|
/**
|
|
* Iterates through the current contents.
|
|
*
|
|
* Attempts to access this dlist during iteration are allowed (to
|
|
* allow for e.g. breadth-first search with in-place enqueues), but
|
|
* removing the current node is forbidden.
|
|
*/
|
|
pub fn each(@mut self, f: &fn(v: &T) -> bool) -> bool {
|
|
let mut link = self.peek_n();
|
|
while link.is_some() {
|
|
let nobe = link.get();
|
|
assert!(nobe.linked);
|
|
|
|
{
|
|
let frozen_nobe = &*nobe;
|
|
if !f(&frozen_nobe.data) { return false; }
|
|
}
|
|
|
|
// Check (weakly) that the user didn't do a remove.
|
|
if self.size == 0 {
|
|
fail!("The dlist became empty during iteration??")
|
|
}
|
|
if !nobe.linked ||
|
|
(!((nobe.prev.is_some()
|
|
|| managed::mut_ptr_eq(self.hd.expect("headless dlist?"),
|
|
nobe))
|
|
&& (nobe.next.is_some()
|
|
|| managed::mut_ptr_eq(self.tl.expect("tailless dlist?"),
|
|
nobe)))) {
|
|
fail!("Removing a dlist node during iteration is forbidden!")
|
|
}
|
|
link = nobe.next_link();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// Get the size of the list. O(1).
|
|
pub fn len(@mut self) -> uint { self.size }
|
|
/// Returns true if the list is empty. O(1).
|
|
pub fn is_empty(@mut self) -> bool { self.len() == 0 }
|
|
|
|
/// Add data to the head of the list. O(1).
|
|
pub fn push_head(@mut self, data: T) {
|
|
self.add_head(DList::new_link(data));
|
|
}
|
|
/**
|
|
* Add data to the head of the list, and get the new containing
|
|
* node. O(1).
|
|
*/
|
|
pub fn push_head_n(@mut self, data: T) -> @mut DListNode<T> {
|
|
let nobe = DList::new_link(data);
|
|
self.add_head(nobe);
|
|
nobe.get()
|
|
}
|
|
/// Add data to the tail of the list. O(1).
|
|
pub fn push(@mut self, data: T) {
|
|
self.add_tail(DList::new_link(data));
|
|
}
|
|
/**
|
|
* Add data to the tail of the list, and get the new containing
|
|
* node. O(1).
|
|
*/
|
|
pub fn push_n(@mut self, data: T) -> @mut DListNode<T> {
|
|
let nobe = DList::new_link(data);
|
|
self.add_tail(nobe);
|
|
nobe.get()
|
|
}
|
|
/**
|
|
* Insert data into the middle of the list, left of the given node.
|
|
* O(1).
|
|
*/
|
|
pub fn insert_before(@mut self, data: T, neighbour: @mut DListNode<T>) {
|
|
self.insert_left(DList::new_link(data), neighbour);
|
|
}
|
|
/**
|
|
* Insert an existing node in the middle of the list, left of the
|
|
* given node. O(1).
|
|
*/
|
|
pub fn insert_n_before(@mut self,
|
|
nobe: @mut DListNode<T>,
|
|
neighbour: @mut DListNode<T>) {
|
|
self.make_mine(nobe);
|
|
self.insert_left(Some(nobe), neighbour);
|
|
}
|
|
/**
|
|
* Insert data in the middle of the list, left of the given node,
|
|
* and get its containing node. O(1).
|
|
*/
|
|
pub fn insert_before_n(@mut self,
|
|
data: T,
|
|
neighbour: @mut DListNode<T>)
|
|
-> @mut DListNode<T> {
|
|
let nobe = DList::new_link(data);
|
|
self.insert_left(nobe, neighbour);
|
|
nobe.get()
|
|
}
|
|
/**
|
|
* Insert data into the middle of the list, right of the given node.
|
|
* O(1).
|
|
*/
|
|
pub fn insert_after(@mut self, data: T, neighbour: @mut DListNode<T>) {
|
|
self.insert_right(neighbour, DList::new_link(data));
|
|
}
|
|
/**
|
|
* Insert an existing node in the middle of the list, right of the
|
|
* given node. O(1).
|
|
*/
|
|
pub fn insert_n_after(@mut self,
|
|
nobe: @mut DListNode<T>,
|
|
neighbour: @mut DListNode<T>) {
|
|
self.make_mine(nobe);
|
|
self.insert_right(neighbour, Some(nobe));
|
|
}
|
|
/**
|
|
* Insert data in the middle of the list, right of the given node,
|
|
* and get its containing node. O(1).
|
|
*/
|
|
pub fn insert_after_n(@mut self,
|
|
data: T,
|
|
neighbour: @mut DListNode<T>)
|
|
-> @mut DListNode<T> {
|
|
let nobe = DList::new_link(data);
|
|
self.insert_right(neighbour, nobe);
|
|
nobe.get()
|
|
}
|
|
|
|
/// Remove a node from the head of the list. O(1).
|
|
pub fn pop_n(@mut self) -> DListLink<T> {
|
|
let hd = self.peek_n();
|
|
hd.map(|nobe| self.unlink(*nobe));
|
|
hd
|
|
}
|
|
/// Remove a node from the tail of the list. O(1).
|
|
pub fn pop_tail_n(@mut self) -> DListLink<T> {
|
|
let tl = self.peek_tail_n();
|
|
tl.map(|nobe| self.unlink(*nobe));
|
|
tl
|
|
}
|
|
/// Get the node at the list's head. O(1).
|
|
pub fn peek_n(@mut self) -> DListLink<T> { self.hd }
|
|
/// Get the node at the list's tail. O(1).
|
|
pub fn peek_tail_n(@mut self) -> DListLink<T> { self.tl }
|
|
|
|
/// Get the node at the list's head, failing if empty. O(1).
|
|
pub fn head_n(@mut self) -> @mut DListNode<T> {
|
|
match self.hd {
|
|
Some(nobe) => nobe,
|
|
None => fail!("Attempted to get the head of an empty dlist.")
|
|
}
|
|
}
|
|
/// Get the node at the list's tail, failing if empty. O(1).
|
|
pub fn tail_n(@mut self) -> @mut DListNode<T> {
|
|
match self.tl {
|
|
Some(nobe) => nobe,
|
|
None => fail!("Attempted to get the tail of an empty dlist.")
|
|
}
|
|
}
|
|
|
|
/// Remove a node from anywhere in the list. O(1).
|
|
pub fn remove(@mut self, nobe: @mut DListNode<T>) { self.unlink(nobe); }
|
|
|
|
/**
|
|
* Empty another list onto the end of this list, joining this list's tail
|
|
* to the other list's head. O(1).
|
|
*/
|
|
pub fn append(@mut self, them: @mut DList<T>) {
|
|
if managed::mut_ptr_eq(self, them) {
|
|
fail!("Cannot append a dlist to itself!")
|
|
}
|
|
if them.len() > 0 {
|
|
self.link(self.tl, them.hd);
|
|
self.tl = them.tl;
|
|
self.size += them.size;
|
|
them.size = 0;
|
|
them.hd = None;
|
|
them.tl = None;
|
|
}
|
|
}
|
|
/**
|
|
* Empty another list onto the start of this list, joining the other
|
|
* list's tail to this list's head. O(1).
|
|
*/
|
|
pub fn prepend(@mut self, them: @mut DList<T>) {
|
|
if managed::mut_ptr_eq(self, them) {
|
|
fail!("Cannot prepend a dlist to itself!")
|
|
}
|
|
if them.len() > 0 {
|
|
self.link(them.tl, self.hd);
|
|
self.hd = them.hd;
|
|
self.size += them.size;
|
|
them.size = 0;
|
|
them.hd = None;
|
|
them.tl = None;
|
|
}
|
|
}
|
|
|
|
/// Reverse the list's elements in place. O(n).
|
|
pub fn reverse(@mut self) {
|
|
do self.hd.while_some |nobe| {
|
|
let next_nobe = nobe.next;
|
|
self.remove(nobe);
|
|
self.make_mine(nobe);
|
|
self.add_head(Some(nobe));
|
|
next_nobe
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Remove everything from the list. This is important because the cyclic
|
|
* links won't otherwise be automatically refcounted-collected. O(n).
|
|
*/
|
|
pub fn clear(@mut self) {
|
|
// Cute as it would be to simply detach the list and proclaim "O(1)!",
|
|
// the GC would still be a hidden O(n). Better to be honest about it.
|
|
while !self.is_empty() {
|
|
let _ = self.pop_n();
|
|
}
|
|
}
|
|
|
|
/// Iterate over nodes.
|
|
pub fn each_node(@mut self, f: &fn(@mut DListNode<T>) -> bool) -> bool {
|
|
let mut link = self.peek_n();
|
|
while link.is_some() {
|
|
let nobe = link.get();
|
|
if !f(nobe) { return false; }
|
|
link = nobe.next_link();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// Check data structure integrity. O(n).
|
|
pub fn assert_consistent(@mut self) {
|
|
if self.hd.is_none() || self.tl.is_none() {
|
|
assert!(self.hd.is_none() && self.tl.is_none());
|
|
}
|
|
// iterate forwards
|
|
let mut count = 0;
|
|
let mut link = self.peek_n();
|
|
let mut rabbit = link;
|
|
while link.is_some() {
|
|
let nobe = link.get();
|
|
assert!(nobe.linked);
|
|
// check cycle
|
|
if rabbit.is_some() {
|
|
rabbit = rabbit.get().next;
|
|
}
|
|
if rabbit.is_some() {
|
|
rabbit = rabbit.get().next;
|
|
}
|
|
if rabbit.is_some() {
|
|
assert!(!managed::mut_ptr_eq(rabbit.get(), nobe));
|
|
}
|
|
// advance
|
|
link = nobe.next_link();
|
|
count += 1;
|
|
}
|
|
assert_eq!(count, self.len());
|
|
// iterate backwards - some of this is probably redundant.
|
|
link = self.peek_tail_n();
|
|
rabbit = link;
|
|
while link.is_some() {
|
|
let nobe = link.get();
|
|
assert!(nobe.linked);
|
|
// check cycle
|
|
if rabbit.is_some() {
|
|
rabbit = rabbit.get().prev;
|
|
}
|
|
if rabbit.is_some() {
|
|
rabbit = rabbit.get().prev;
|
|
}
|
|
if rabbit.is_some() {
|
|
assert!(!managed::mut_ptr_eq(rabbit.get(), nobe));
|
|
}
|
|
// advance
|
|
link = nobe.prev_link();
|
|
count -= 1;
|
|
}
|
|
assert_eq!(count, 0);
|
|
}
|
|
}
|
|
|
|
impl<T:Copy> DList<T> {
|
|
/// Remove data from the head of the list. O(1).
|
|
pub fn pop(@mut self) -> Option<T> {
|
|
self.pop_n().map(|nobe| copy nobe.data)
|
|
}
|
|
|
|
/// Remove data from the tail of the list. O(1).
|
|
pub fn pop_tail(@mut self) -> Option<T> {
|
|
self.pop_tail_n().map(|nobe| copy nobe.data)
|
|
}
|
|
|
|
/// Get data at the list's head. O(1).
|
|
pub fn peek(@mut self) -> Option<T> {
|
|
self.peek_n().map(|nobe| copy nobe.data)
|
|
}
|
|
|
|
/// Get data at the list's tail. O(1).
|
|
pub fn peek_tail(@mut self) -> Option<T> {
|
|
self.peek_tail_n().map (|nobe| copy nobe.data)
|
|
}
|
|
|
|
/// Get data at the list's head, failing if empty. O(1).
|
|
pub fn head(@mut self) -> T { copy self.head_n().data }
|
|
|
|
/// Get data at the list's tail, failing if empty. O(1).
|
|
pub fn tail(@mut self) -> T { copy self.tail_n().data }
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_dlist_concat() {
|
|
let a = from_vec([1,2]);
|
|
let b = from_vec([3,4]);
|
|
let c = from_vec([5,6]);
|
|
let d = from_vec([7,8]);
|
|
let ab = from_vec([a,b]);
|
|
let cd = from_vec([c,d]);
|
|
let abcd = concat(concat(from_vec([ab,cd])));
|
|
abcd.assert_consistent(); assert_eq!(abcd.len(), 8);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 1);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 2);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 3);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 4);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 5);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 6);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 7);
|
|
abcd.assert_consistent(); assert_eq!(abcd.pop().get(), 8);
|
|
abcd.assert_consistent(); assert!(abcd.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_append() {
|
|
let a = from_vec([1,2,3]);
|
|
let b = from_vec([4,5,6]);
|
|
a.append(b);
|
|
assert_eq!(a.len(), 6);
|
|
assert_eq!(b.len(), 0);
|
|
b.assert_consistent();
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 1);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 2);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 3);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 4);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 5);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 6);
|
|
a.assert_consistent(); assert!(a.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_append_empty() {
|
|
let a = from_vec([1,2,3]);
|
|
let b = DList::<int>();
|
|
a.append(b);
|
|
assert_eq!(a.len(), 3);
|
|
assert_eq!(b.len(), 0);
|
|
b.assert_consistent();
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 1);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 2);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 3);
|
|
a.assert_consistent(); assert!(a.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_append_to_empty() {
|
|
let a = DList::<int>();
|
|
let b = from_vec([4,5,6]);
|
|
a.append(b);
|
|
assert_eq!(a.len(), 3);
|
|
assert_eq!(b.len(), 0);
|
|
b.assert_consistent();
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 4);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 5);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 6);
|
|
a.assert_consistent(); assert!(a.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_append_two_empty() {
|
|
let a = DList::<int>();
|
|
let b = DList::<int>();
|
|
a.append(b);
|
|
assert_eq!(a.len(), 0);
|
|
assert_eq!(b.len(), 0);
|
|
b.assert_consistent();
|
|
a.assert_consistent();
|
|
}
|
|
#[test]
|
|
#[ignore(cfg(windows))]
|
|
#[should_fail]
|
|
fn test_dlist_append_self() {
|
|
let a = DList::<int>();
|
|
a.append(a);
|
|
}
|
|
#[test]
|
|
#[ignore(cfg(windows))]
|
|
#[should_fail]
|
|
fn test_dlist_prepend_self() {
|
|
let a = DList::<int>();
|
|
a.prepend(a);
|
|
}
|
|
#[test]
|
|
fn test_dlist_prepend() {
|
|
let a = from_vec([1,2,3]);
|
|
let b = from_vec([4,5,6]);
|
|
b.prepend(a);
|
|
assert_eq!(a.len(), 0);
|
|
assert_eq!(b.len(), 6);
|
|
a.assert_consistent();
|
|
b.assert_consistent(); assert_eq!(b.pop().get(), 1);
|
|
b.assert_consistent(); assert_eq!(b.pop().get(), 2);
|
|
b.assert_consistent(); assert_eq!(b.pop().get(), 3);
|
|
b.assert_consistent(); assert_eq!(b.pop().get(), 4);
|
|
b.assert_consistent(); assert_eq!(b.pop().get(), 5);
|
|
b.assert_consistent(); assert_eq!(b.pop().get(), 6);
|
|
b.assert_consistent(); assert!(b.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_reverse() {
|
|
let a = from_vec([5,4,3,2,1]);
|
|
a.reverse();
|
|
assert_eq!(a.len(), 5);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 1);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 2);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 3);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 4);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 5);
|
|
a.assert_consistent(); assert!(a.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_reverse_empty() {
|
|
let a = DList::<int>();
|
|
a.reverse();
|
|
assert_eq!(a.len(), 0);
|
|
a.assert_consistent();
|
|
}
|
|
#[test]
|
|
fn test_dlist_each_node() {
|
|
let a = from_vec([1,2,4,5]);
|
|
for a.each_node |nobe| {
|
|
if nobe.data > 3 {
|
|
a.insert_before(3, nobe);
|
|
}
|
|
}
|
|
assert_eq!(a.len(), 6);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 1);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 2);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 3);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 4);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 3);
|
|
a.assert_consistent(); assert_eq!(a.pop().get(), 5);
|
|
a.assert_consistent(); assert!(a.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_clear() {
|
|
let a = from_vec([5,4,3,2,1]);
|
|
a.clear();
|
|
assert_eq!(a.len(), 0);
|
|
a.assert_consistent();
|
|
}
|
|
#[test]
|
|
fn test_dlist_is_empty() {
|
|
let empty = DList::<int>();
|
|
let full1 = from_vec([1,2,3]);
|
|
assert!(empty.is_empty());
|
|
assert!(!full1.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_head_tail() {
|
|
let l = from_vec([1,2,3]);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.tail(), 3);
|
|
assert_eq!(l.len(), 3);
|
|
}
|
|
#[test]
|
|
fn test_dlist_pop() {
|
|
let l = from_vec([1,2,3]);
|
|
assert_eq!(l.pop().get(), 1);
|
|
assert_eq!(l.tail(), 3);
|
|
assert_eq!(l.head(), 2);
|
|
assert_eq!(l.pop().get(), 2);
|
|
assert_eq!(l.tail(), 3);
|
|
assert_eq!(l.head(), 3);
|
|
assert_eq!(l.pop().get(), 3);
|
|
assert!(l.is_empty());
|
|
assert!(l.pop().is_none());
|
|
}
|
|
#[test]
|
|
fn test_dlist_pop_tail() {
|
|
let l = from_vec([1,2,3]);
|
|
assert_eq!(l.pop_tail().get(), 3);
|
|
assert_eq!(l.tail(), 2);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.pop_tail().get(), 2);
|
|
assert_eq!(l.tail(), 1);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.pop_tail().get(), 1);
|
|
assert!(l.is_empty());
|
|
assert!(l.pop_tail().is_none());
|
|
}
|
|
#[test]
|
|
fn test_dlist_push() {
|
|
let l = DList::<int>();
|
|
l.push(1);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.tail(), 1);
|
|
l.push(2);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.tail(), 2);
|
|
l.push(3);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.tail(), 3);
|
|
assert_eq!(l.len(), 3);
|
|
}
|
|
#[test]
|
|
fn test_dlist_push_head() {
|
|
let l = DList::<int>();
|
|
l.push_head(3);
|
|
assert_eq!(l.head(), 3);
|
|
assert_eq!(l.tail(), 3);
|
|
l.push_head(2);
|
|
assert_eq!(l.head(), 2);
|
|
assert_eq!(l.tail(), 3);
|
|
l.push_head(1);
|
|
assert_eq!(l.head(), 1);
|
|
assert_eq!(l.tail(), 3);
|
|
assert_eq!(l.len(), 3);
|
|
}
|
|
#[test]
|
|
fn test_dlist_break_early() {
|
|
let l = from_vec([1,2,3,4,5]);
|
|
let mut x = 0;
|
|
for l.each |i| {
|
|
x += 1;
|
|
if (*i == 3) { break; }
|
|
}
|
|
assert_eq!(x, 3);
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_head() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let one = l.push_n(1);
|
|
l.assert_consistent(); let _two = l.push_n(2);
|
|
l.assert_consistent(); let _three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(one);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); assert_eq!(l.head(), 2);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_mid() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let _one = l.push_n(1);
|
|
l.assert_consistent(); let two = l.push_n(2);
|
|
l.assert_consistent(); let _three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(two);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); assert_eq!(l.head(), 1);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_tail() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let _one = l.push_n(1);
|
|
l.assert_consistent(); let _two = l.push_n(2);
|
|
l.assert_consistent(); let three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); assert_eq!(l.head(), 1);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_one_two() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let one = l.push_n(1);
|
|
l.assert_consistent(); let two = l.push_n(2);
|
|
l.assert_consistent(); let _three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(one);
|
|
l.assert_consistent(); l.remove(two);
|
|
// and through and through, the vorpal blade went snicker-snack
|
|
l.assert_consistent(); assert_eq!(l.len(), 1);
|
|
l.assert_consistent(); assert_eq!(l.head(), 3);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_one_three() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let one = l.push_n(1);
|
|
l.assert_consistent(); let _two = l.push_n(2);
|
|
l.assert_consistent(); let three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(one);
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); assert_eq!(l.len(), 1);
|
|
l.assert_consistent(); assert_eq!(l.head(), 2);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_two_three() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let _one = l.push_n(1);
|
|
l.assert_consistent(); let two = l.push_n(2);
|
|
l.assert_consistent(); let three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(two);
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); assert_eq!(l.len(), 1);
|
|
l.assert_consistent(); assert_eq!(l.head(), 1);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_remove_all() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let one = l.push_n(1);
|
|
l.assert_consistent(); let two = l.push_n(2);
|
|
l.assert_consistent(); let three = l.push_n(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); l.remove(two);
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); l.remove(one); // Twenty-three is number one!
|
|
l.assert_consistent(); assert!(l.peek().is_none());
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_insert_n_before() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let _one = l.push_n(1);
|
|
l.assert_consistent(); let two = l.push_n(2);
|
|
l.assert_consistent(); let three = new_dlist_node(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); l.insert_n_before(three, two);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); assert_eq!(l.head(), 1);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_insert_n_after() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let one = l.push_n(1);
|
|
l.assert_consistent(); let _two = l.push_n(2);
|
|
l.assert_consistent(); let three = new_dlist_node(3);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); l.insert_n_after(three, one);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); assert_eq!(l.head(), 1);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_insert_before_head() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let one = l.push_n(1);
|
|
l.assert_consistent(); let _two = l.push_n(2);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); l.insert_before(3, one);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); assert_eq!(l.head(), 3);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test]
|
|
fn test_dlist_insert_after_tail() {
|
|
let l = DList::<int>();
|
|
l.assert_consistent(); let _one = l.push_n(1);
|
|
l.assert_consistent(); let two = l.push_n(2);
|
|
l.assert_consistent(); assert_eq!(l.len(), 2);
|
|
l.assert_consistent(); l.insert_after(3, two);
|
|
l.assert_consistent(); assert_eq!(l.len(), 3);
|
|
l.assert_consistent(); assert_eq!(l.head(), 1);
|
|
l.assert_consistent(); assert_eq!(l.tail(), 3);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 1);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 2);
|
|
l.assert_consistent(); assert_eq!(l.pop().get(), 3);
|
|
l.assert_consistent(); assert!(l.is_empty());
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_asymmetric_link() {
|
|
let l = DList::<int>();
|
|
let _one = l.push_n(1);
|
|
let two = l.push_n(2);
|
|
two.prev = None;
|
|
l.assert_consistent();
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_cyclic_list() {
|
|
let l = DList::<int>();
|
|
let one = l.push_n(1);
|
|
let _two = l.push_n(2);
|
|
let three = l.push_n(3);
|
|
three.next = Some(one);
|
|
one.prev = Some(three);
|
|
l.assert_consistent();
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_headless() {
|
|
DList::<int>().head();
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_insert_already_present_before() {
|
|
let l = DList::<int>();
|
|
let one = l.push_n(1);
|
|
let two = l.push_n(2);
|
|
l.insert_n_before(two, one);
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_insert_already_present_after() {
|
|
let l = DList::<int>();
|
|
let one = l.push_n(1);
|
|
let two = l.push_n(2);
|
|
l.insert_n_after(one, two);
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_insert_before_orphan() {
|
|
let l = DList::<int>();
|
|
let one = new_dlist_node(1);
|
|
let two = new_dlist_node(2);
|
|
l.insert_n_before(one, two);
|
|
}
|
|
#[test] #[should_fail] #[ignore(cfg(windows))]
|
|
fn test_dlist_insert_after_orphan() {
|
|
let l = DList::<int>();
|
|
let one = new_dlist_node(1);
|
|
let two = new_dlist_node(2);
|
|
l.insert_n_after(two, one);
|
|
}
|
|
}
|