898 lines
30 KiB
Rust
898 lines
30 KiB
Rust
// NB: transitionary, de-mode-ing.
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#[forbid(deprecated_mode)];
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#[forbid(deprecated_pattern)];
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/**
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* A doubly-linked list. Supports O(1) head, tail, count, push, pop, etc.
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*
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* Do not use ==, !=, <, etc on doubly-linked lists -- it may not terminate.
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*/
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export DList;
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export new_dlist, from_elem, from_vec, extensions;
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type DListLink<T> = Option<DListNode<T>>;
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enum DListNode<T> = @{
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data: T,
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mut linked: bool, // for assertions
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mut prev: DListLink<T>,
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mut next: DListLink<T>
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};
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enum DList<T> {
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DList_(@{
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mut size: uint,
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mut hd: DListLink<T>,
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mut tl: DListLink<T>
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})
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}
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priv impl<T> DListNode<T> {
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pure fn assert_links() {
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match self.next {
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Some(neighbour) => match neighbour.prev {
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Some(me) => if !box::ptr_eq(*self, *me) {
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fail ~"Asymmetric next-link in dlist node."
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},
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None => fail ~"One-way next-link in dlist node."
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},
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None => ()
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}
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match self.prev {
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Some(neighbour) => match neighbour.next {
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Some(me) => if !box::ptr_eq(*me, *self) {
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fail ~"Asymmetric prev-link in dlist node."
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},
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None => fail ~"One-way prev-link in dlist node."
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},
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None => ()
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}
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}
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}
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impl<T> DListNode<T> {
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/// Get the next node in the list, if there is one.
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pure fn next_link() -> Option<DListNode<T>> {
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self.assert_links();
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self.next
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}
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/// Get the next node in the list, failing if there isn't one.
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pure fn next_node() -> DListNode<T> {
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match self.next_link() {
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Some(nobe) => nobe,
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None => fail ~"This dlist node has no next neighbour."
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}
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}
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/// Get the previous node in the list, if there is one.
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pure fn prev_link() -> Option<DListNode<T>> {
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self.assert_links();
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self.prev
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}
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/// Get the previous node in the list, failing if there isn't one.
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pure fn prev_node() -> DListNode<T> {
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match self.prev_link() {
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Some(nobe) => nobe,
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None => fail ~"This dlist node has no previous neighbour."
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}
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}
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}
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/// Creates a new dlist node with the given data.
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pure fn new_dlist_node<T>(+data: T) -> DListNode<T> {
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DListNode(@{data: move data, mut linked: false,
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mut prev: None, mut next: None})
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}
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/// Creates a new, empty dlist.
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pure fn DList<T>() -> DList<T> {
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DList_(@{mut size: 0, mut hd: None, mut tl: None})
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}
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/// Creates a new dlist with a single element
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pure fn from_elem<T>(+data: T) -> DList<T> {
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let list = DList();
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unsafe { list.push(move data); }
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list
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}
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fn from_vec<T: Copy>(+vec: &[T]) -> DList<T> {
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do vec::foldl(DList(), vec) |list,data| {
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list.push(data); // Iterating left-to-right -- add newly to the tail.
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list
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}
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}
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/// Produce a list from a list of lists, leaving no elements behind in the
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/// input. O(number of sub-lists).
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fn concat<T>(lists: DList<DList<T>>) -> DList<T> {
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let result = DList();
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while !lists.is_empty() {
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result.append(lists.pop().get());
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}
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result
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}
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priv impl<T> DList<T> {
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pure fn new_link(-data: T) -> DListLink<T> {
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Some(DListNode(@{data: move data, mut linked: true,
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mut prev: None, mut next: None}))
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}
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pure fn assert_mine(nobe: DListNode<T>) {
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// These asserts could be stronger if we had node-root back-pointers,
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// but those wouldn't allow for O(1) append.
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if self.size == 0 {
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fail ~"This dlist is empty; that node can't be on it."
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}
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if !nobe.linked { fail ~"That node isn't linked to any dlist." }
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if !((nobe.prev.is_some()
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|| box::ptr_eq(*self.hd.expect(~"headless dlist?"), *nobe)) &&
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(nobe.next.is_some()
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|| box::ptr_eq(*self.tl.expect(~"tailless dlist?"), *nobe))) {
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fail ~"That node isn't on this dlist."
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}
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}
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fn make_mine(nobe: DListNode<T>) {
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if nobe.prev.is_some() || nobe.next.is_some() || nobe.linked {
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fail ~"Cannot insert node that's already on a dlist!"
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}
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nobe.linked = true;
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}
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// Link two nodes together. If either of them are 'none', also sets
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// the head and/or tail pointers appropriately.
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#[inline(always)]
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fn link(+before: DListLink<T>, +after: DListLink<T>) {
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match before {
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Some(neighbour) => neighbour.next = after,
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None => self.hd = after
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}
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match after {
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Some(neighbour) => neighbour.prev = before,
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None => self.tl = before
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}
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}
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// Remove a node from the list.
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fn unlink(nobe: DListNode<T>) {
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self.assert_mine(nobe);
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assert self.size > 0;
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self.link(nobe.prev, nobe.next);
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nobe.prev = None; // Release extraneous references.
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nobe.next = None;
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nobe.linked = false;
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self.size -= 1;
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}
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fn add_head(+nobe: DListLink<T>) {
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self.link(nobe, self.hd); // Might set tail too.
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self.hd = nobe;
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self.size += 1;
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}
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fn add_tail(+nobe: DListLink<T>) {
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self.link(self.tl, nobe); // Might set head too.
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self.tl = nobe;
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self.size += 1;
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}
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fn insert_left(nobe: DListLink<T>, neighbour: DListNode<T>) {
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self.assert_mine(neighbour);
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assert self.size > 0;
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self.link(neighbour.prev, nobe);
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self.link(nobe, Some(neighbour));
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self.size += 1;
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}
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fn insert_right(neighbour: DListNode<T>, nobe: DListLink<T>) {
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self.assert_mine(neighbour);
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assert self.size > 0;
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self.link(nobe, neighbour.next);
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self.link(Some(neighbour), nobe);
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self.size += 1;
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}
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}
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impl<T> DList<T> {
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/// Get the size of the list. O(1).
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pure fn len() -> uint { self.size }
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/// Returns true if the list is empty. O(1).
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pure fn is_empty() -> bool { self.len() == 0 }
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/// Returns true if the list is not empty. O(1).
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pure fn is_not_empty() -> bool { self.len() != 0 }
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/// Add data to the head of the list. O(1).
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fn push_head(+data: T) {
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self.add_head(self.new_link(move data));
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}
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/**
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* Add data to the head of the list, and get the new containing
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* node. O(1).
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*/
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fn push_head_n(+data: T) -> DListNode<T> {
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let mut nobe = self.new_link(move data);
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self.add_head(nobe);
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option::get(nobe)
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}
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/// Add data to the tail of the list. O(1).
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fn push(+data: T) {
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self.add_tail(self.new_link(move data));
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}
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/**
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* Add data to the tail of the list, and get the new containing
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* node. O(1).
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*/
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fn push_n(+data: T) -> DListNode<T> {
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let mut nobe = self.new_link(move data);
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self.add_tail(nobe);
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option::get(nobe)
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}
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/**
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* Insert data into the middle of the list, left of the given node.
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* O(1).
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*/
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fn insert_before(+data: T, neighbour: DListNode<T>) {
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self.insert_left(self.new_link(move data), neighbour);
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}
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/**
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* Insert an existing node in the middle of the list, left of the
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* given node. O(1).
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*/
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fn insert_n_before(nobe: DListNode<T>, neighbour: DListNode<T>) {
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self.make_mine(nobe);
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self.insert_left(Some(nobe), neighbour);
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}
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/**
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* Insert data in the middle of the list, left of the given node,
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* and get its containing node. O(1).
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*/
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fn insert_before_n(+data: T, neighbour: DListNode<T>) -> DListNode<T> {
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let mut nobe = self.new_link(move data);
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self.insert_left(nobe, neighbour);
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option::get(nobe)
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}
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/**
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* Insert data into the middle of the list, right of the given node.
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* O(1).
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*/
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fn insert_after(+data: T, neighbour: DListNode<T>) {
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self.insert_right(neighbour, self.new_link(move data));
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}
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/**
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* Insert an existing node in the middle of the list, right of the
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* given node. O(1).
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*/
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fn insert_n_after(nobe: DListNode<T>, neighbour: DListNode<T>) {
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self.make_mine(nobe);
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self.insert_right(neighbour, Some(nobe));
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}
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/**
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* Insert data in the middle of the list, right of the given node,
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* and get its containing node. O(1).
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*/
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fn insert_after_n(+data: T, neighbour: DListNode<T>) -> DListNode<T> {
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let mut nobe = self.new_link(move data);
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self.insert_right(neighbour, nobe);
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option::get(nobe)
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}
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/// Remove a node from the head of the list. O(1).
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fn pop_n() -> Option<DListNode<T>> {
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let hd = self.peek_n();
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hd.map(|nobe| self.unlink(nobe));
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hd
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}
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/// Remove a node from the tail of the list. O(1).
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fn pop_tail_n() -> Option<DListNode<T>> {
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let tl = self.peek_tail_n();
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tl.map(|nobe| self.unlink(nobe));
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tl
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}
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/// Get the node at the list's head. O(1).
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pure fn peek_n() -> Option<DListNode<T>> { self.hd }
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/// Get the node at the list's tail. O(1).
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pure fn peek_tail_n() -> Option<DListNode<T>> { self.tl }
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/// Get the node at the list's head, failing if empty. O(1).
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pure fn head_n() -> DListNode<T> {
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match self.hd {
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Some(nobe) => nobe,
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None => fail ~"Attempted to get the head of an empty dlist."
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}
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}
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/// Get the node at the list's tail, failing if empty. O(1).
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pure fn tail_n() -> DListNode<T> {
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match self.tl {
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Some(nobe) => nobe,
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None => fail ~"Attempted to get the tail of an empty dlist."
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}
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}
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/// Remove a node from anywhere in the list. O(1).
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fn remove(nobe: DListNode<T>) { self.unlink(nobe); }
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/**
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* Empty another list onto the end of this list, joining this list's tail
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* to the other list's head. O(1).
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*/
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fn append(them: DList<T>) {
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if box::ptr_eq(*self, *them) {
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fail ~"Cannot append a dlist to itself!"
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}
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if them.len() > 0 {
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self.link(self.tl, them.hd);
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self.tl = them.tl;
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self.size += them.size;
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them.size = 0;
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them.hd = None;
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them.tl = None;
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}
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}
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/**
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* Empty another list onto the start of this list, joining the other
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* list's tail to this list's head. O(1).
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*/
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fn prepend(them: DList<T>) {
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if box::ptr_eq(*self, *them) {
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fail ~"Cannot prepend a dlist to itself!"
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}
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if them.len() > 0 {
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self.link(them.tl, self.hd);
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self.hd = them.hd;
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self.size += them.size;
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them.size = 0;
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them.hd = None;
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them.tl = None;
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}
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}
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/// Reverse the list's elements in place. O(n).
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fn reverse() {
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do option::while_some(self.hd) |nobe| {
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let next_nobe = nobe.next;
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self.remove(nobe);
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self.make_mine(nobe);
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self.add_head(Some(nobe));
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next_nobe
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}
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}
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/**
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* Remove everything from the list. This is important because the cyclic
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* links won't otherwise be automatically refcounted-collected. O(n).
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*/
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fn clear() {
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// Cute as it would be to simply detach the list and proclaim "O(1)!",
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// the GC would still be a hidden O(n). Better to be honest about it.
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while !self.is_empty() {
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let _ = self.pop_n();
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}
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}
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/// Iterate over nodes.
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pure fn each_node(f: fn(DListNode<T>) -> bool) {
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let mut link = self.peek_n();
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while link.is_some() {
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let nobe = link.get();
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if !f(nobe) { break; }
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link = nobe.next_link();
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}
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}
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/// Check data structure integrity. O(n).
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fn assert_consistent() {
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if option::is_none(self.hd) || option::is_none(self.tl) {
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assert option::is_none(self.hd) && option::is_none(self.tl);
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}
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// iterate forwards
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let mut count = 0;
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let mut link = self.peek_n();
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let mut rabbit = link;
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while option::is_some(link) {
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let nobe = option::get(link);
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assert nobe.linked;
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// check cycle
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if option::is_some(rabbit) { rabbit = option::get(rabbit).next; }
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if option::is_some(rabbit) { rabbit = option::get(rabbit).next; }
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if option::is_some(rabbit) {
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assert !box::ptr_eq(*option::get(rabbit), *nobe);
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}
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// advance
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link = nobe.next_link();
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count += 1;
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}
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assert count == self.len();
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// iterate backwards - some of this is probably redundant.
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link = self.peek_tail_n();
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rabbit = link;
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while option::is_some(link) {
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let nobe = option::get(link);
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assert nobe.linked;
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// check cycle
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if option::is_some(rabbit) { rabbit = option::get(rabbit).prev; }
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if option::is_some(rabbit) { rabbit = option::get(rabbit).prev; }
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if option::is_some(rabbit) {
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assert !box::ptr_eq(*option::get(rabbit), *nobe);
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}
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// advance
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link = nobe.prev_link();
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count -= 1;
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}
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assert count == 0;
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}
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}
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impl<T: Copy> DList<T> {
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/// Remove data from the head of the list. O(1).
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fn pop() -> Option<T> { self.pop_n().map (|nobe| nobe.data) }
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/// Remove data from the tail of the list. O(1).
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fn pop_tail() -> Option<T> { self.pop_tail_n().map (|nobe| nobe.data) }
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/// Get data at the list's head. O(1).
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pure fn peek() -> Option<T> { self.peek_n().map (|nobe| nobe.data) }
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/// Get data at the list's tail. O(1).
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pure fn peek_tail() -> Option<T> {
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self.peek_tail_n().map (|nobe| nobe.data)
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}
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/// Get data at the list's head, failing if empty. O(1).
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pure fn head() -> T { self.head_n().data }
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/// Get data at the list's tail, failing if empty. O(1).
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pure fn tail() -> T { self.tail_n().data }
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/// Get the elements of the list as a vector. O(n).
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pure fn to_vec() -> ~[mut T] {
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let mut v = ~[mut];
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unsafe {
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vec::reserve(v, self.size);
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// Take this out of the unchecked when iter's functions are pure
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for self.eachi |index,data| {
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v[index] = data;
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}
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}
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move v
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}
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn test_dlist_concat() {
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let a = from_vec(~[1,2]);
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let b = from_vec(~[3,4]);
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let c = from_vec(~[5,6]);
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let d = from_vec(~[7,8]);
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let ab = from_vec(~[a,b]);
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let cd = from_vec(~[c,d]);
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let abcd = concat(concat(from_vec(~[ab,cd])));
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abcd.assert_consistent(); assert abcd.len() == 8;
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abcd.assert_consistent(); assert abcd.pop().get() == 1;
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abcd.assert_consistent(); assert abcd.pop().get() == 2;
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abcd.assert_consistent(); assert abcd.pop().get() == 3;
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abcd.assert_consistent(); assert abcd.pop().get() == 4;
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abcd.assert_consistent(); assert abcd.pop().get() == 5;
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abcd.assert_consistent(); assert abcd.pop().get() == 6;
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abcd.assert_consistent(); assert abcd.pop().get() == 7;
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abcd.assert_consistent(); assert abcd.pop().get() == 8;
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abcd.assert_consistent(); assert abcd.is_empty();
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}
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#[test]
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fn test_dlist_append() {
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let a = from_vec(~[1,2,3]);
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let b = from_vec(~[4,5,6]);
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a.append(b);
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assert a.len() == 6;
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assert b.len() == 0;
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b.assert_consistent();
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a.assert_consistent(); assert a.pop().get() == 1;
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a.assert_consistent(); assert a.pop().get() == 2;
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a.assert_consistent(); assert a.pop().get() == 3;
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a.assert_consistent(); assert a.pop().get() == 4;
|
|
a.assert_consistent(); assert a.pop().get() == 5;
|
|
a.assert_consistent(); assert 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 a.len() == 3;
|
|
assert b.len() == 0;
|
|
b.assert_consistent();
|
|
a.assert_consistent(); assert a.pop().get() == 1;
|
|
a.assert_consistent(); assert a.pop().get() == 2;
|
|
a.assert_consistent(); assert 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 a.len() == 3;
|
|
assert b.len() == 0;
|
|
b.assert_consistent();
|
|
a.assert_consistent(); assert a.pop().get() == 4;
|
|
a.assert_consistent(); assert a.pop().get() == 5;
|
|
a.assert_consistent(); assert 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 a.len() == 0;
|
|
assert 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 a.len() == 0;
|
|
assert b.len() == 6;
|
|
a.assert_consistent();
|
|
b.assert_consistent(); assert b.pop().get() == 1;
|
|
b.assert_consistent(); assert b.pop().get() == 2;
|
|
b.assert_consistent(); assert b.pop().get() == 3;
|
|
b.assert_consistent(); assert b.pop().get() == 4;
|
|
b.assert_consistent(); assert b.pop().get() == 5;
|
|
b.assert_consistent(); assert 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 a.len() == 5;
|
|
a.assert_consistent(); assert a.pop().get() == 1;
|
|
a.assert_consistent(); assert a.pop().get() == 2;
|
|
a.assert_consistent(); assert a.pop().get() == 3;
|
|
a.assert_consistent(); assert a.pop().get() == 4;
|
|
a.assert_consistent(); assert a.pop().get() == 5;
|
|
a.assert_consistent(); assert a.is_empty();
|
|
}
|
|
#[test]
|
|
fn test_dlist_reverse_empty() {
|
|
let a = DList::<int>();
|
|
a.reverse();
|
|
assert 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 a.len() == 6;
|
|
a.assert_consistent(); assert a.pop().get() == 1;
|
|
a.assert_consistent(); assert a.pop().get() == 2;
|
|
a.assert_consistent(); assert a.pop().get() == 3;
|
|
a.assert_consistent(); assert a.pop().get() == 4;
|
|
a.assert_consistent(); assert a.pop().get() == 3;
|
|
a.assert_consistent(); assert 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 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();
|
|
assert !empty.is_not_empty();
|
|
assert full1.is_not_empty();
|
|
}
|
|
#[test]
|
|
fn test_dlist_head_tail() {
|
|
let l = from_vec(~[1,2,3]);
|
|
assert l.head() == 1;
|
|
assert l.tail() == 3;
|
|
assert l.len() == 3;
|
|
}
|
|
#[test]
|
|
fn test_dlist_pop() {
|
|
let l = from_vec(~[1,2,3]);
|
|
assert l.pop().get() == 1;
|
|
assert l.tail() == 3;
|
|
assert l.head() == 2;
|
|
assert l.pop().get() == 2;
|
|
assert l.tail() == 3;
|
|
assert l.head() == 3;
|
|
assert 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 l.pop_tail().get() == 3;
|
|
assert l.tail() == 2;
|
|
assert l.head() == 1;
|
|
assert l.pop_tail().get() == 2;
|
|
assert l.tail() == 1;
|
|
assert l.head() == 1;
|
|
assert 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 l.head() == 1;
|
|
assert l.tail() == 1;
|
|
l.push(2);
|
|
assert l.head() == 1;
|
|
assert l.tail() == 2;
|
|
l.push(3);
|
|
assert l.head() == 1;
|
|
assert l.tail() == 3;
|
|
assert l.len() == 3;
|
|
}
|
|
#[test]
|
|
fn test_dlist_push_head() {
|
|
let l = DList::<int>();
|
|
l.push_head(3);
|
|
assert l.head() == 3;
|
|
assert l.tail() == 3;
|
|
l.push_head(2);
|
|
assert l.head() == 2;
|
|
assert l.tail() == 3;
|
|
l.push_head(1);
|
|
assert l.head() == 1;
|
|
assert l.tail() == 3;
|
|
assert l.len() == 3;
|
|
}
|
|
#[test]
|
|
fn test_dlist_foldl() {
|
|
let l = from_vec(vec::from_fn(101, |x|x));
|
|
assert iter::foldl(l, 0, |accum,elem| accum+elem) == 5050;
|
|
}
|
|
#[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 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 l.len() == 3;
|
|
l.assert_consistent(); l.remove(one);
|
|
l.assert_consistent(); assert l.len() == 2;
|
|
l.assert_consistent(); assert l.head() == 2;
|
|
l.assert_consistent(); assert l.tail() == 3;
|
|
l.assert_consistent(); assert l.pop().get() == 2;
|
|
l.assert_consistent(); assert 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 l.len() == 3;
|
|
l.assert_consistent(); l.remove(two);
|
|
l.assert_consistent(); assert l.len() == 2;
|
|
l.assert_consistent(); assert l.head() == 1;
|
|
l.assert_consistent(); assert l.tail() == 3;
|
|
l.assert_consistent(); assert l.pop().get() == 1;
|
|
l.assert_consistent(); assert 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 l.len() == 3;
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); assert l.len() == 2;
|
|
l.assert_consistent(); assert l.head() == 1;
|
|
l.assert_consistent(); assert l.tail() == 2;
|
|
l.assert_consistent(); assert l.pop().get() == 1;
|
|
l.assert_consistent(); assert 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 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 l.len() == 1;
|
|
l.assert_consistent(); assert l.head() == 3;
|
|
l.assert_consistent(); assert l.tail() == 3;
|
|
l.assert_consistent(); assert 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 l.len() == 3;
|
|
l.assert_consistent(); l.remove(one);
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); assert l.len() == 1;
|
|
l.assert_consistent(); assert l.head() == 2;
|
|
l.assert_consistent(); assert l.tail() == 2;
|
|
l.assert_consistent(); assert 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 l.len() == 3;
|
|
l.assert_consistent(); l.remove(two);
|
|
l.assert_consistent(); l.remove(three);
|
|
l.assert_consistent(); assert l.len() == 1;
|
|
l.assert_consistent(); assert l.head() == 1;
|
|
l.assert_consistent(); assert l.tail() == 1;
|
|
l.assert_consistent(); assert 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 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 l.len() == 2;
|
|
l.assert_consistent(); l.insert_n_before(three, two);
|
|
l.assert_consistent(); assert l.len() == 3;
|
|
l.assert_consistent(); assert l.head() == 1;
|
|
l.assert_consistent(); assert l.tail() == 2;
|
|
l.assert_consistent(); assert l.pop().get() == 1;
|
|
l.assert_consistent(); assert l.pop().get() == 3;
|
|
l.assert_consistent(); assert 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 l.len() == 2;
|
|
l.assert_consistent(); l.insert_n_after(three, one);
|
|
l.assert_consistent(); assert l.len() == 3;
|
|
l.assert_consistent(); assert l.head() == 1;
|
|
l.assert_consistent(); assert l.tail() == 2;
|
|
l.assert_consistent(); assert l.pop().get() == 1;
|
|
l.assert_consistent(); assert l.pop().get() == 3;
|
|
l.assert_consistent(); assert 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 l.len() == 2;
|
|
l.assert_consistent(); l.insert_before(3, one);
|
|
l.assert_consistent(); assert l.len() == 3;
|
|
l.assert_consistent(); assert l.head() == 3;
|
|
l.assert_consistent(); assert l.tail() == 2;
|
|
l.assert_consistent(); assert l.pop().get() == 3;
|
|
l.assert_consistent(); assert l.pop().get() == 1;
|
|
l.assert_consistent(); assert 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 l.len() == 2;
|
|
l.assert_consistent(); l.insert_after(3, two);
|
|
l.assert_consistent(); assert l.len() == 3;
|
|
l.assert_consistent(); assert l.head() == 1;
|
|
l.assert_consistent(); assert l.tail() == 3;
|
|
l.assert_consistent(); assert l.pop().get() == 1;
|
|
l.assert_consistent(); assert l.pop().get() == 2;
|
|
l.assert_consistent(); assert 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);
|
|
}
|
|
}
|