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https://codeberg.org/ziglang/zig.git
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Merge 3ae7876a50 into e4be00f949
This commit is contained in:
Isaac Yonemoto
GitHub
commit
a35b113def
3 changed files with 369 additions and 0 deletions
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@ -283,3 +283,242 @@ test "concatenation" {
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}
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}
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}
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/// implements a simple intrusive doubly linked list with a "data" field alongside
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/// "node" field. This hides @fieldParentPtr complexity and adds type safety for the
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/// simple case. If you need more advanced cases, for example an object being a member of
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/// multiple intrusive lists, you should use DoublyLinkedList directly.
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///
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/// note that the signatures on the member functions of the generated datastructure take
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/// pointers to the item, not the node.
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pub fn Simple(T: type) type {
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return struct {
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const SimpleLinkedList = @This();
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wrapped: DoublyLinkedList = .{},
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pub const Item = struct {
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data: T,
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node: Node = .{},
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pub fn next(item: *Item) ?*Item {
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return @fieldParentPtr("node", item.node.next orelse return null);
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}
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pub fn prev(item: *Item) ?*Item {
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return @fieldParentPtr("node", item.node.prev orelse return null);
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}
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};
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pub fn append(list: *SimpleLinkedList, new_item: *Item) void {
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list.wrapped.append(&new_item.node);
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}
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pub fn insertAfter(list: *SimpleLinkedList, existing_item: *Item, new_item: *Item) void {
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list.wrapped.insertAfter(&existing_item.node, &new_item.node);
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}
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pub fn prepend(list: *SimpleLinkedList, new_item: *Item) void {
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list.wrapped.prepend(&new_item.node);
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}
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pub fn insertBefore(list: *SimpleLinkedList, existing_item: *Item, new_item: *Item) void {
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list.wrapped.insertBefore(&existing_item.node, &new_item.node);
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}
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pub fn concatByMoving(list: *SimpleLinkedList, other_list: *SimpleLinkedList) void {
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list.wrapped.concatByMoving(&other_list.wrapped);
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}
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/// Remove a node from the list.
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pub fn remove(list: *SimpleLinkedList, item: *Item) void {
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list.wrapped.remove(&item.node);
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}
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/// Remove and return the last node in the list.
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pub fn pop(list: *SimpleLinkedList) ?*Item {
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const poppednode = (list.wrapped.pop()) orelse return null;
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return @fieldParentPtr("node", poppednode);
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}
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/// Remove and return the first node in the list.
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pub fn popFirst(list: *SimpleLinkedList) ?*Item {
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const poppednode = (list.wrapped.popFirst()) orelse return null;
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return @fieldParentPtr("node", poppednode);
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}
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/// Given a Simple list, returns the item at position <index>.
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/// If the list does not have that many elements, returns `null`.
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///
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/// This is a linear search through the list, consider avoiding this
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/// operation, except for index == 0
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pub fn at(list: *SimpleLinkedList, index: usize) ?*Item {
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var thisnode = list.wrapped.first orelse return null;
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var ctr: usize = index;
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while (ctr > 0) : (ctr -= 1) {
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thisnode = thisnode.next orelse return null;
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}
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return @fieldParentPtr("node", thisnode);
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}
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/// Given a Simple list, returns the item at position <len-index-1>.
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/// Note the last element is at index "0". If the list does not have
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/// that many elements, returns `null`.
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///
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/// This is a linear search through the list, consider avoiding this
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/// operation, except for index == 0
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pub fn fromEnd(list: *SimpleLinkedList, index: usize) ?*Item {
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var thisnode = list.wrapped.last orelse return null;
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var ctr: usize = index;
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while (ctr > 0) : (ctr -= 1) {
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thisnode = thisnode.prev orelse return null;
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}
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return @fieldParentPtr("node", thisnode);
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}
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// Iterate over all nodes, returning the count.
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///
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/// This operation is O(N). Consider tracking the length separately rather than
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/// computing it.
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pub fn len(list: SimpleLinkedList) usize {
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return list.wrapped.len();
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}
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};
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}
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test "Simple DLL basics" {
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const List = Simple(u32);
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const Item = List.Item;
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var list: List = .{};
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var one: Item = .{ .data = 1 };
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var two: Item = .{ .data = 2 };
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var three: Item = .{ .data = 3 };
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var four: Item = .{ .data = 4 };
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var five: Item = .{ .data = 5 };
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list.append(&two); // {2}
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list.append(&five); // {2, 5}
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list.prepend(&one); // {1, 2, 5}
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list.insertBefore(&five, &four); // {1, 2, 4, 5}
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list.insertAfter(&two, &three); // {1, 2, 3, 4, 5}
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// Traverse forwards.
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{
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var it = list.wrapped.first;
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var index: u32 = 1;
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while (it) |node| : (it = node.next) {
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const l: *Item = @fieldParentPtr("node", node);
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try testing.expect(l.data == index);
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index += 1;
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}
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}
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// Traverse forward, using item datastructures
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{
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var it = list.at(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.next()) {
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try testing.expect(item.data == index);
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index += 1;
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}
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}
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// Traverse backwards.
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{
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var it = list.wrapped.last;
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var index: u32 = 1;
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while (it) |node| : (it = node.prev) {
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const l: *Item = @fieldParentPtr("node", node);
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try testing.expect(l.data == (6 - index));
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index += 1;
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}
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}
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// Traverse backwards, using item datastructures
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{
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var it = list.fromEnd(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.prev()) {
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try testing.expect(item.data == (6 - index));
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index += 1;
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}
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}
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_ = list.popFirst(); // {2, 3, 4, 5}
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_ = list.pop(); // {2, 3, 4}
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list.remove(&three); // {2, 4}
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try testing.expect(list.at(0).?.data == 2);
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try testing.expect(list.fromEnd(0).?.data == 4);
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try testing.expect(list.len() == 2);
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}
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test "Simple DLL concatenation" {
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const List = Simple(u32);
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const Item = List.Item;
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var list1: List = .{};
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var list2: List = .{};
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var one: Item = .{ .data = 1 };
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var two: Item = .{ .data = 2 };
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var three: Item = .{ .data = 3 };
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var four: Item = .{ .data = 4 };
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var five: Item = .{ .data = 5 };
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list1.append(&one);
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list1.append(&two);
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list2.append(&three);
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list2.append(&four);
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list2.append(&five);
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list1.concatByMoving(&list2);
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try testing.expect(list1.wrapped.last == &five.node);
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try testing.expect(list1.len() == 5);
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try testing.expect(list2.wrapped.first == null);
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try testing.expect(list2.wrapped.last == null);
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try testing.expect(list2.len() == 0);
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// Traverse forwards.
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{
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var it = list1.at(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.next()) {
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try testing.expect(item.data == index);
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index += 1;
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}
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}
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// Traverse backwards.
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{
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var it = list1.fromEnd(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.prev()) {
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try testing.expect(item.data == (6 - index));
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index += 1;
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}
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}
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// Swap them back, this verifies that concatenating to an empty list works.
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list2.concatByMoving(&list1);
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// Traverse forwards.
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{
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var it = list2.at(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.next()) {
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try testing.expect(item.data == index);
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index += 1;
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}
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}
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// Traverse backwards.
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{
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var it = list2.fromEnd(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.prev()) {
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try testing.expect(item.data == (6 - index));
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index += 1;
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}
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}
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}
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@ -166,3 +166,131 @@ test "basics" {
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try testing.expect(@as(*L, @fieldParentPtr("node", list.first.?.next.?)).data == 2);
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try testing.expect(list.first.?.next.?.next == null);
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}
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/// implements a simple intrusive singly linked list with a "data" field alongside
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/// "node" field. This hides @fieldParentPtr complexity and adds type safety for the
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/// simple case. If you need more advanced cases, for example an object being a member of
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/// multiple intrusive lists, you should use SinglyLinkedList directly.
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///
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/// note that the signatures on the member functions of the generated datastructure take
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/// pointers to the item, not the node.
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pub fn Simple(T: type) type {
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return struct {
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const SimpleLinkedList = @This();
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wrapped: SinglyLinkedList = .{},
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pub const Item = struct {
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data: T,
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node: Node = .{},
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pub fn next(item: *Item) ?*Item {
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return @fieldParentPtr("node", item.node.next orelse return null);
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}
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pub fn insertAfter(item: *Item, new_item: *Item) void {
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item.node.insertAfter(&new_item.node);
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}
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};
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pub fn prepend(list: *SimpleLinkedList, new_item: *Item) void {
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list.wrapped.prepend(&new_item.node);
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}
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pub fn remove(list: *SimpleLinkedList, item: *Item) void {
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list.wrapped.remove(&item.node);
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}
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/// Remove and return the first node in the list.
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pub fn popFirst(list: *SimpleLinkedList) ?*Item {
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const poppednode = (list.wrapped.popFirst()) orelse return null;
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return @fieldParentPtr("node", poppednode);
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}
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/// Given a Simple list, returns the item at position <index>.
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/// If the list does not have that many elements, returns `null`.
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///
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/// This is a linear search through the list, consider avoiding this
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/// operation, except for index == 0
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pub fn at(list: *SimpleLinkedList, index: usize) ?*Item {
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var thisnode = list.wrapped.first orelse return null;
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var ctr: usize = index;
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while (ctr > 0) : (ctr -= 1) {
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thisnode = thisnode.next orelse return null;
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}
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return @fieldParentPtr("node", thisnode);
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}
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// Iterate over all nodes, returning the count.
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///
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/// This operation is O(N). Consider tracking the length separately rather than
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/// computing it.
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pub fn len(list: SimpleLinkedList) usize {
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return list.wrapped.len();
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}
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};
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}
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test "Simple singly linked list" {
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const SimpleList = Simple(u32);
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const L = SimpleList.Item;
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var list: SimpleList = .{};
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try testing.expect(list.len() == 0);
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var one: L = .{ .data = 1 };
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var two: L = .{ .data = 2 };
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var three: L = .{ .data = 3 };
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var four: L = .{ .data = 4 };
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var five: L = .{ .data = 5 };
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try testing.expect(list.at(0) == null);
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list.prepend(&two); // {2}
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two.node.insertAfter(&five.node); // {2, 5}
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list.prepend(&one); // {1, 2, 5}
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two.insertAfter(&three); // {1, 2, 3, 5}
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three.node.insertAfter(&four.node); // {1, 2, 3, 4, 5}
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try testing.expect(list.len() == 5);
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try testing.expect(list.at(0).?.data == 1);
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try testing.expect(list.at(3).?.data == 4);
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try testing.expect(list.at(7) == null);
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try testing.expect(one.next().?.data == 2);
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try testing.expect(two.next().?.data == 3);
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try testing.expect(three.next().?.data == 4);
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try testing.expect(four.next().?.data == 5);
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try testing.expect(five.next() == null);
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// Traverse forwards.
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{
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var it = list.at(0);
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var index: u32 = 1;
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while (it) |item| : (it = item.next()) {
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try testing.expect(item.data == index);
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index += 1;
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}
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}
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_ = list.popFirst(); // {2, 3, 4, 5}
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_ = list.remove(&five); // {2, 3, 4}
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_ = two.node.removeNext(); // {2, 4}
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try testing.expect(@as(*L, @fieldParentPtr("node", list.wrapped.first.?)).data == 2);
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try testing.expect(list.at(0).?.data == 2);
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try testing.expect(@as(*L, @fieldParentPtr("node", list.wrapped.first.?.next.?)).data == 4);
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try testing.expect(list.at(1).?.data == 4);
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try testing.expect(list.wrapped.first.?.next.?.next == null);
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SinglyLinkedList.Node.reverse(&list.wrapped.first);
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try testing.expect(@as(*L, @fieldParentPtr("node", list.wrapped.first.?)).data == 4);
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try testing.expect(list.at(0).?.data == 4);
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try testing.expect(@as(*L, @fieldParentPtr("node", list.wrapped.first.?.next.?)).data == 2);
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try testing.expect(list.at(1).?.data == 2);
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try testing.expect(list.wrapped.first.?.next.?.next == null);
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try testing.expect(list.at(2) == null);
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}
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@ -12,6 +12,7 @@ pub const StaticStringMap = static_string_map.StaticStringMap;
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pub const StaticStringMapWithEql = static_string_map.StaticStringMapWithEql;
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pub const Deque = @import("deque.zig").Deque;
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pub const DoublyLinkedList = @import("DoublyLinkedList.zig");
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pub const SimpleDoublyLinkedList = DoublyLinkedList.Simple;
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pub const DynLib = @import("dynamic_library.zig").DynLib;
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pub const DynamicBitSet = bit_set.DynamicBitSet;
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pub const DynamicBitSetUnmanaged = bit_set.DynamicBitSetUnmanaged;
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@ -28,6 +29,7 @@ pub const Progress = @import("Progress.zig");
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pub const Random = @import("Random.zig");
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pub const SemanticVersion = @import("SemanticVersion.zig");
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pub const SinglyLinkedList = @import("SinglyLinkedList.zig");
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pub const SimpleSinglyLinkedList = SinglyLinkedList.Simple;
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pub const StaticBitSet = bit_set.StaticBitSet;
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pub const StringHashMap = hash_map.StringHashMap;
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pub const StringHashMapUnmanaged = hash_map.StringHashMapUnmanaged;
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