EventTarget internal type for all

src/browser/dom/event_target.zig

@@ -16,6 +16,7 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+const std = @import("std");
 const Env = @import("../env.zig").Env;
 const parser = @import("../netsurf.zig");
 const Page = @import("../page.zig").Page;
@@ -39,33 +40,30 @@ pub const EventTarget = struct {
     // Extend libdom event target for pure zig struct.
     base: parser.EventTargetTBase = parser.EventTargetTBase{ .internal_target_type = .plain },
 
-    pub fn toInterface(e: *parser.Event, et: *parser.EventTarget, page: *Page) !Union {
+    pub fn toInterface(et: *parser.EventTarget, page: *Page) !Union {
         // libdom assumes that all event targets are libdom nodes. They are not.
 
-        // The window is a common non-node target, but it's easy to handle as
-        // its a singleton.
-        if (@intFromPtr(et) == @intFromPtr(&page.window.base)) {
-            return .{ .node = .{ .Window = &page.window } };
-        }
-
-        if (try parser.eventTargetInternalType(et) == .plain) {
-            return .{ .plain = et };
-        }
-
-        // AbortSignal is another non-node target. It has a distinct usage though
-        // so we hijack the event internal type to identity if.
-        switch (try parser.eventGetInternalType(e)) {
+        switch (try parser.eventTargetInternalType(et)) {
+            .libdom_node => {
+                return .{ .node = try nod.Node.toInterface(@as(*parser.Node, @ptrCast(et))) };
+            },
+            .plain => return .{ .plain = et },
             .abort_signal => {
+                // AbortSignal is a special case, it has its own internal type.
+                // We return it as a node, but we need to handle it differently.
                 return .{ .node = .{ .AbortSignal = @fieldParentPtr("proto", @as(*parser.EventTargetTBase, @ptrCast(et))) } };
             },
-            .xhr_event => {
+            .window => {
+                // The window is a common non-node target, but it's easy to handle as its a singleton.
+                std.debug.assert(@intFromPtr(et) == @intFromPtr(&page.window.base));
+                return .{ .node = .{ .Window = &page.window } };
+            },
+            .xhr => {
                 const XMLHttpRequestEventTarget = @import("../xhr/event_target.zig").XMLHttpRequestEventTarget;
                 const base: *XMLHttpRequestEventTarget = @fieldParentPtr("base", @as(*parser.EventTargetTBase, @ptrCast(et)));
                 return .{ .xhr = @fieldParentPtr("proto", base) };
             },
-            else => {
-                return .{ .node = try nod.Node.toInterface(@as(*parser.Node, @ptrCast(et))) };
-            },
+            else => return error.MissingEventTargetType,
         }
     }
 

src/browser/dom/performance.zig

@@ -39,7 +39,7 @@ pub const Performance = struct {
     pub const prototype = *EventTarget;
 
     // Extend libdom event target for pure zig struct.
-    base: parser.EventTargetTBase = parser.EventTargetTBase{},
+    base: parser.EventTargetTBase = parser.EventTargetTBase{ .internal_target_type = .performance },
 
     time_origin: std.time.Timer,
     // if (Window.crossOriginIsolated) -> Resolution in isolated contexts:       5 microseconds

src/browser/events/event.zig

@@ -78,13 +78,13 @@ pub const Event = struct {
     pub fn get_target(self: *parser.Event, page: *Page) !?EventTargetUnion {
         const et = try parser.eventTarget(self);
         if (et == null) return null;
-        return try EventTarget.toInterface(self, et.?, page);
+        return try EventTarget.toInterface(et.?, page);
     }
 
     pub fn get_currentTarget(self: *parser.Event, page: *Page) !?EventTargetUnion {
         const et = try parser.eventCurrentTarget(self);
         if (et == null) return null;
-        return try EventTarget.toInterface(self, et.?, page);
+        return try EventTarget.toInterface(et.?, page);
     }
 
     pub fn get_eventPhase(self: *parser.Event) !u8 {

src/browser/html/AbortController.zig

@@ -56,13 +56,12 @@ pub const AbortSignal = struct {
     const DEFAULT_REASON = "AbortError";
 
     pub const prototype = *EventTarget;
-    proto: parser.EventTargetTBase = .{},
+    proto: parser.EventTargetTBase = .{ .internal_target_type = .abort_signal },
 
     aborted: bool,
     reason: ?[]const u8,
 
     pub const init: AbortSignal = .{
-        .proto = .{},
         .reason = null,
         .aborted = false,
     };

src/browser/html/media_query_list.zig

@@ -26,7 +26,7 @@ pub const MediaQueryList = struct {
 
     // Extend libdom event target for pure zig struct.
     // This is not safe as it relies on a structure layout that isn't guaranteed
-    base: parser.EventTargetTBase = parser.EventTargetTBase{},
+    base: parser.EventTargetTBase = parser.EventTargetTBase{ .internal_target_type = .media_query_list },
 
     matches: bool,
     media: []const u8,

src/browser/html/window.zig

@@ -45,7 +45,7 @@ pub const Window = struct {
     pub const prototype = *EventTarget;
 
     // Extend libdom event target for pure zig struct.
-    base: parser.EventTargetTBase = parser.EventTargetTBase{},
+    base: parser.EventTargetTBase = parser.EventTargetTBase{ .internal_target_type = .window },
 
     document: *parser.DocumentHTML,
     target: []const u8 = "",

src/browser/netsurf.zig

@@ -779,8 +779,13 @@ pub fn eventTargetTBaseFieldName(comptime T: type) ?[]const u8 {
 pub const EventTargetTBase = extern struct {
     const Self = @This();
     const InternalType = enum(u32) {
-        libdom = 0,
+        libdom_node = 0,
         plain = 1,
+        abort_signal = 2,
+        xhr = 3,
+        window = 4,
+        performance = 5,
+        media_query_list = 6,
     };
 
     vtable: ?*const c.struct_dom_event_target_vtable = &c.struct_dom_event_target_vtable{
@@ -802,7 +807,7 @@ pub const EventTargetTBase = extern struct {
     refcnt: u32 = 0,
 
     eti: c.dom_event_target_internal = c.dom_event_target_internal{ .listeners = null },
-    internal_target_type: InternalType = .libdom,
+    internal_target_type: InternalType,
 
     pub fn add_event_listener(et: [*c]c.dom_event_target, t: [*c]c.dom_string, l: ?*c.struct_dom_event_listener, capture: bool) callconv(.C) c.dom_exception {
         const self = @as(*Self, @ptrCast(et));

src/browser/xhr/event_target.zig

@@ -31,7 +31,7 @@ pub const XMLHttpRequestEventTarget = struct {
     pub const prototype = *EventTarget;
 
     // Extend libdom event target for pure zig struct.
-    base: parser.EventTargetTBase = parser.EventTargetTBase{},
+    base: parser.EventTargetTBase = parser.EventTargetTBase{ .internal_target_type = .xhr },
 
     onloadstart_cbk: ?Function = null,
     onprogress_cbk: ?Function = null,