dom: implement comment constructor

src/dom/comment.zig

@@ -15,11 +15,18 @@
 //
 // 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.zig");
 
+const jsruntime = @import("jsruntime");
+const Case = jsruntime.test_utils.Case;
+const checkCases = jsruntime.test_utils.checkCases;
+
 const CharacterData = @import("character_data.zig").CharacterData;
 
+const UserContext = @import("../user_context.zig").UserContext;
+
 // https://dom.spec.whatwg.org/#interface-comment
 pub const Comment = struct {
     pub const Self = parser.Comment;
@@ -32,7 +39,29 @@ pub const Comment = struct {
     // > and this’s node document to current global object’s associated
     // > Document.
     // https://dom.spec.whatwg.org/#dom-comment-comment
-    pub fn constructor() !*parser.Comment {
+    pub fn constructor(userctx: UserContext, data: ?[]const u8) !*parser.Comment {
-        return error.NotImplemented;
+        if (userctx.document == null) return parser.DOMError.NotSupported;
+
+        return parser.documentCreateComment(
+            parser.documentHTMLToDocument(userctx.document.?),
+            data orelse "",
+        );
     }
 };
+
+// Tests
+// -----
+
+pub fn testExecFn(
+    _: std.mem.Allocator,
+    js_env: *jsruntime.Env,
+) anyerror!void {
+    var constructor = [_]Case{
+        .{ .src = "let comment = new Comment('foo')", .ex = "undefined" },
+        .{ .src = "comment.data", .ex = "foo" },
+
+        .{ .src = "let emptycomment = new Comment()", .ex = "undefined" },
+        .{ .src = "emptycomment.data", .ex = "" },
+    };
+    try checkCases(js_env, &constructor);
+}

src/run_tests.zig

@@ -46,6 +46,7 @@ const NodeListTestExecFn = @import("dom/nodelist.zig").testExecFn;
 const AttrTestExecFn = @import("dom/attribute.zig").testExecFn;
 const EventTargetTestExecFn = @import("dom/event_target.zig").testExecFn;
 const ProcessingInstructionTestExecFn = @import("dom/processing_instruction.zig").testExecFn;
+const CommentTestExecFn = @import("dom/comment.zig").testExecFn;
 const EventTestExecFn = @import("events/event.zig").testExecFn;
 const XHRTestExecFn = xhr.testExecFn;
 const ProgressEventTestExecFn = @import("xhr/progress_event.zig").testExecFn;
@@ -114,6 +115,7 @@ fn testsAllExecFn(
         DOMTokenListExecFn,
         NodeListTestExecFn,
         AttrTestExecFn,
+        CommentTestExecFn,
         EventTargetTestExecFn,
         EventTestExecFn,
         XHRTestExecFn,