Element closest

Author: sjorsdonkers

src/browser/dom/element.zig

@@ -135,6 +135,30 @@ pub const Element = struct {
         }
     }
 
+    // The closest() method of the Element interface traverses the element and its parents (heading toward the document root) until it finds a node that matches the specified CSS selector.
+    // Returns the closest ancestor Element or itself, which matches the selectors. If there are no such element, null.
+    pub fn _closest(self: *parser.Element, selector: []const u8, state: *SessionState) !?*parser.Element {
+        const cssParse = @import("../css/css.zig").parse;
+        const CssNodeWrap = @import("../css/libdom.zig").Node;
+        const select = try cssParse(state.call_arena, selector, .{});
+
+        var current: CssNodeWrap = .{ .node = parser.elementToNode(self) };
+        while (true) {
+            if (try select.match(current)) {
+                if (!current.isElement()) {
+                    std.debug.print("closest: is not an element: {s}\n", .{try current.tag()});
+                    return null;
+                }
+                return parser.nodeToElement(current.node);
+            }
+            if (try current.parent()) |parent| {
+                current = parent;
+                continue;
+            }
+            return null;
+        }
+    }
+
     pub fn _hasAttributes(self: *parser.Element) !bool {
         return try parser.nodeHasAttributes(parser.elementToNode(self));
     }
@@ -401,6 +425,20 @@ test "Browser.DOM.Element" {
         .{ "cl.length", "2" },
     }, .{});
 
+    try runner.testCases(&.{
+        .{ "const el2 = document.createElement('div');", "undefined" },
+        .{ "el2.id = 'closest'; el2.className = 'ok';", "ok" },
+        .{ "el2.closest('#closest')", "[object HTMLDivElement]" },
+        .{ "el2.closest('.ok')", "[object HTMLDivElement]" },
+        .{ "el2.closest('#9000')", "null" },
+        .{ "el2.closest('.notok')", "null" },
+
+        .{ "const sp = document.createElement('span');", "undefined" },
+        .{ "el2.appendChild(sp);", "[object HTMLSpanElement]" },
+        .{ "sp.closest('#closest')", "[object HTMLDivElement]" },
+        .{ "sp.closest('#9000')", "null" },
+    }, .{});
+
     try runner.testCases(&.{
         .{ "let a = document.getElementById('content')", "undefined" },
         .{ "a.hasAttributes()", "true" },