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netsurf: use EventTargetTBase field to cast EventTarget

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This commit is contained in:
Pierre Tachoire
2024-02-15 15:59:45 +01:00
parent bc7055c98d
commit 069313817a
3 changed files with 32 additions and 2 deletions
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2
src/browser/browser.zig
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@@ -333,7 +333,7 @@ pub const Page = struct {
// dispatch window.load event
const loadevt = try parser.eventCreate();
try parser.eventInit(loadevt, "load", .{});
_ = try parser.eventTargetDispatchEvent(parser.toEventTarget(Window, &self.session.window), loadevt);
_ = try parser.eventTargetDispatchEvent(parser.toEventTarget(EventTargetTBase, &self.session.window), loadevt);
}
// evalScript evaluates the src in priority.

19
src/netsurf.zig
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@@ -483,6 +483,11 @@ fn eventTargetVtable(et: *EventTarget) c.dom_event_target_vtable {
}
pub inline fn toEventTarget(comptime T: type, v: *T) *EventTarget {
if (comptime eventTargetTBaseFieldName(T)) |field| {
const et_aligned: *align(@alignOf(EventTarget)) EventTargetTBase = @alignCast(&@field(v, field));
return @as(*EventTarget, @ptrCast(et_aligned));
}
const et_aligned: *align(@alignOf(EventTarget)) T = @alignCast(v);
return @as(*EventTarget, @ptrCast(et_aligned));
}
@@ -633,6 +638,20 @@ pub fn eventTargetDispatchEvent(et: *EventTarget, event: *Event) !bool {
return res;
}
pub fn eventTargetTBaseFieldName(comptime T: type) ?[]const u8 {
std.debug.assert(@inComptime());
switch (@typeInfo(T)) {
.Struct => |ti| {
for (ti.fields) |f| {
if (f.type == EventTargetTBase) return f.name;
}
},
else => {},
}
return null;
}
// EventTargetBase is used to implement EventTarget for pure zig struct.
pub const EventTargetTBase = struct {
const Self = @This();

13
src/run_tests.zig
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@@ -143,6 +143,17 @@ test "Window is a libdom event target" {
const event = try parser.eventCreate();
try parser.eventInit(event, "foo", .{});
const et = @as(*parser.EventTarget, @ptrCast(&window));
const et = parser.toEventTarget(Window, &window);
_ = try parser.eventTargetDispatchEvent(et, event);
}
test "DocumentHTML is a libdom event target" {
doc = try parser.documentHTMLParseFromStr("<body></body>");
parser.documentHTMLClose(doc) catch {};
const event = try parser.eventCreate();
try parser.eventInit(event, "foo", .{});
const et = parser.toEventTarget(parser.DocumentHTML, doc);
_ = try parser.eventTargetDispatchEvent(et, event);
}