node: add hasChildnodes method

Signed-off-by: Francis Bouvier <francis.bouvier@gmail.com>

src/dom/node.zig

@@ -150,6 +150,10 @@ pub const Node = struct {
         _ = self;
         @panic("Not implemented node.getRootNode()");
     }
+
+    pub fn _hasChildNodes(self: *parser.Node) bool {
+        return parser.nodeHasChildNodes(self);
+    }
 };
 
 pub const Types = generate.Tuple(.{
@@ -290,4 +294,10 @@ pub fn testExecFn(
         .{ .src = "text.contains(link)", .ex = "false" },
     };
     try checkCases(js_env, &node_contains);
+
+    var node_has_child_nodes = [_]Case{
+        .{ .src = "link.hasChildNodes()", .ex = "true" },
+        .{ .src = "text.hasChildNodes()", .ex = "false" },
+    };
+    try checkCases(js_env, &node_has_child_nodes);
 }

src/netsurf.zig

@@ -352,6 +352,12 @@ pub fn nodeContains(node: *Node, other: *Node) bool {
     return res;
 }
 
+pub fn nodeHasChildNodes(node: *Node) bool {
+    var res: bool = undefined;
+    _ = nodeVtable(node).dom_node_has_child_nodes.?(node, &res);
+    return res;
+}
+
 // CharacterData
 pub const CharacterData = c.dom_characterdata;