From 12111d4cdfecb5ff316501f67aa123696ade8dab Mon Sep 17 00:00:00 2001
From: Pierre Tachoire <pierre@lightpanda.io>
Date: Wed, 19 Jun 2024 13:48:39 +0200
Subject: [PATCH] dom: first draft for MutationObserver

---
 src/dom/dom.zig               |  2 +
 src/dom/mutation_observer.zig | 77 +++++++++++++++++++++++++++++++++++
 src/run_tests.zig             |  2 +
 3 files changed, 81 insertions(+)
 create mode 100644 src/dom/mutation_observer.zig

diff --git a/src/dom/dom.zig b/src/dom/dom.zig
index 168ae81a..1ec36379 100644
--- a/src/dom/dom.zig
+++ b/src/dom/dom.zig
@@ -25,6 +25,7 @@ const NamedNodeMap = @import("namednodemap.zig").NamedNodeMap;
 const DOMTokenList = @import("token_list.zig").DOMTokenList;
 const NodeList = @import("nodelist.zig").NodeList;
 const Nod = @import("node.zig");
+const MutationObserver = @import("mutation_observer.zig");
 
 pub const Interfaces = generate.Tuple(.{
     DOMException,
@@ -35,4 +36,5 @@ pub const Interfaces = generate.Tuple(.{
     NodeList,
     Nod.Node,
     Nod.Interfaces,
+    MutationObserver.Interfaces,
 });
diff --git a/src/dom/mutation_observer.zig b/src/dom/mutation_observer.zig
new file mode 100644
index 00000000..ee378379
--- /dev/null
+++ b/src/dom/mutation_observer.zig
@@ -0,0 +1,77 @@
+// Copyright (C) 2023-2024  Lightpanda (Selecy SAS)
+//
+// Francis Bouvier <francis@lightpanda.io>
+// Pierre Tachoire <pierre@lightpanda.io>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// 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 parser = @import("netsurf");
+
+const jsruntime = @import("jsruntime");
+const Callback = jsruntime.Callback;
+const Case = jsruntime.test_utils.Case;
+const checkCases = jsruntime.test_utils.checkCases;
+
+const generate = @import("../generate.zig");
+
+const NodeList = @import("nodelist.zig").NodeList;
+
+pub const Interfaces = generate.Tuple(.{
+    MutationObserver,
+});
+
+// WEB IDL https://dom.spec.whatwg.org/#interface-mutationobserver
+pub const MutationObserver = struct {
+    cbk: Callback,
+
+    pub const mem_guarantied = true;
+
+    pub const MutationObserverInit = struct {
+        childList: bool = false,
+        attributes: bool = false,
+        characterData: bool = false,
+        subtree: bool = false,
+        attributeOldValue: bool = false,
+        characterDataOldValue: bool = false,
+        // TODO
+        // attributeFilter: [][]const u8,
+    };
+
+    pub fn constructor(cbk: Callback) !MutationObserver {
+        return MutationObserver{
+            .cbk = cbk,
+        };
+    }
+
+    pub fn _observe(
+        _: *MutationObserver,
+        _: *parser.Node,
+        _: ?MutationObserverInit,
+    ) !void {}
+
+    // TODO
+    pub fn _disconnect(_: *MutationObserver) !void {}
+};
+
+pub fn testExecFn(
+    _: std.mem.Allocator,
+    js_env: *jsruntime.Env,
+) anyerror!void {
+    var constructor = [_]Case{
+        .{ .src = "new MutationObserver(() => {}).observe(document, { childList: true });", .ex = "undefined" },
+    };
+    try checkCases(js_env, &constructor);
+}
diff --git a/src/run_tests.zig b/src/run_tests.zig
index bf906733..94d46900 100644
--- a/src/run_tests.zig
+++ b/src/run_tests.zig
@@ -55,6 +55,7 @@ const ProgressEventTestExecFn = @import("xhr/progress_event.zig").testExecFn;
 const StorageTestExecFn = storage.testExecFn;
 const URLTestExecFn = url.testExecFn;
 const HTMLElementTestExecFn = @import("html/elements.zig").testExecFn;
+const MutationObserverTestExecFn = @import("dom/mutation_observer.zig").testExecFn;
 
 pub const Types = jsruntime.reflect(apiweb.Interfaces);
 pub const UserContext = @import("user_context.zig").UserContext;
@@ -133,6 +134,7 @@ fn testsAllExecFn(
         StorageTestExecFn,
         URLTestExecFn,
         HTMLElementTestExecFn,
+        MutationObserverTestExecFn,
     };
 
     inline for (testFns) |testFn| {