Improves correctness of NodeIterator

src/browser/dom/document.zig

@@ -249,12 +249,12 @@ pub const Document = struct {
         return Node.replaceChildren(parser.documentToNode(self), nodes);
     }
 
-    pub fn _createTreeWalker(_: *parser.Document, root: *parser.Node, what_to_show: ?u32, filter: ?TreeWalker.TreeWalkerOpts) !TreeWalker {
-        return try TreeWalker.init(root, what_to_show, filter);
+    pub fn _createTreeWalker(_: *parser.Document, root: *parser.Node, what_to_show: ?TreeWalker.WhatToShow, filter: ?TreeWalker.TreeWalkerOpts) !TreeWalker {
+        return TreeWalker.init(root, what_to_show, filter);
     }
 
-    pub fn _createNodeIterator(_: *parser.Document, root: *parser.Node, what_to_show: ?u32, filter: ?NodeIterator.NodeIteratorOpts) !NodeIterator {
-        return try NodeIterator.init(root, what_to_show, filter);
+    pub fn _createNodeIterator(_: *parser.Document, root: *parser.Node, what_to_show: ?NodeIterator.WhatToShow, filter: ?NodeIterator.NodeIteratorOpts) !NodeIterator {
+        return NodeIterator.init(root, what_to_show, filter);
     }
 
     pub fn getActiveElement(self: *parser.Document, page: *Page) !?*parser.Element {

src/browser/dom/node_iterator.zig

@@ -17,32 +17,42 @@
 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 const std = @import("std");
+
 const parser = @import("../netsurf.zig");
 const Env = @import("../env.zig").Env;
 const NodeFilter = @import("node_filter.zig");
 const Node = @import("node.zig").Node;
 const NodeUnion = @import("node.zig").Union;
+const DOMException = @import("exceptions.zig").DOMException;
 
 // https://developer.mozilla.org/en-US/docs/Web/API/NodeIterator
 // While this is similar to TreeWalker it has its own implementation as there are several subtle differences
 // For example:
 // - nextNode returns the reference node, whereas TreeWalker returns the next node
 // - Skip and reject are equivalent for NodeIterator, for TreeWalker they are different
 pub const NodeIterator = struct {
+    pub const Exception = DOMException;
+
     root: *parser.Node,
     reference_node: *parser.Node,
     what_to_show: u32,
     filter: ?NodeIteratorOpts,
     filter_func: ?Env.Function,
-
     pointer_before_current: bool = true,
+    // used to track / block recursive filters
+    is_in_callback: bool = false,
+
+    // One of the few cases where null and undefined resolve to different default.
+    // We need the raw JsObject so that we can probe the tri state:
+    // null, undefined or i32.
+    pub const WhatToShow = Env.JsObject;
 
     pub const NodeIteratorOpts = union(enum) {
         function: Env.Function,
         object: struct { acceptNode: Env.Function },
     };
 
-    pub fn init(node: *parser.Node, what_to_show: ?u32, filter: ?NodeIteratorOpts) !NodeIterator {
+    pub fn init(node: *parser.Node, what_to_show_: ?WhatToShow, filter: ?NodeIteratorOpts) !NodeIterator {
         var filter_func: ?Env.Function = null;
         if (filter) |f| {
             filter_func = switch (f) {
@@ -51,10 +61,21 @@ pub const NodeIterator = struct {
             };
         }
 
+        var what_to_show: u32 = undefined;
+        if (what_to_show_) |wts| {
+            switch (try wts.triState(NodeIterator, "what_to_show", u32)) {
+                .null => what_to_show = 0,
+                .undefined => what_to_show = NodeFilter.NodeFilter._SHOW_ALL,
+                .value => |v| what_to_show = v,
+            }
+        } else {
+            what_to_show = NodeFilter.NodeFilter._SHOW_ALL;
+        }
+
         return .{
             .root = node,
             .reference_node = node,
-            .what_to_show = what_to_show orelse NodeFilter.NodeFilter._SHOW_ALL,
+            .what_to_show = what_to_show,
             .filter = filter,
             .filter_func = filter_func,
         };
@@ -81,9 +102,13 @@ pub const NodeIterator = struct {
     }
 
     pub fn _nextNode(self: *NodeIterator) !?NodeUnion {
-        if (self.pointer_before_current) { // Unlike TreeWalker, NodeIterator starts at the first node
-            self.pointer_before_current = false;
+        try self.callbackStart();
+        defer self.callbackEnd();
+
+        if (self.pointer_before_current) {
+            // Unlike TreeWalker, NodeIterator starts at the first node
             if (.accept == try NodeFilter.verify(self.what_to_show, self.filter_func, self.reference_node)) {
+                self.pointer_before_current = false;
                 return try Node.toInterface(self.reference_node);
             }
         }
@@ -107,13 +132,19 @@ pub const NodeIterator = struct {
     }
 
     pub fn _previousNode(self: *NodeIterator) !?NodeUnion {
+        try self.callbackStart();
+        defer self.callbackEnd();
+
         if (!self.pointer_before_current) {
-            self.pointer_before_current = true;
             if (.accept == try NodeFilter.verify(self.what_to_show, self.filter_func, self.reference_node)) {
-                return try Node.toInterface(self.reference_node); // Still need to verify as last may be first as well
+                self.pointer_before_current = true;
+                // Still need to verify as last may be first as well
+                return try Node.toInterface(self.reference_node);
             }
         }
-        if (self.reference_node == self.root) return null;
+        if (self.reference_node == self.root) {
+            return null;
+        }
 
         var current = self.reference_node;
         while (try parser.nodePreviousSibling(current)) |previous| {
@@ -151,6 +182,11 @@ pub const NodeIterator = struct {
         return null;
     }
 
+    pub fn _detach(self: *const NodeIterator) void {
+        // no-op as per spec
+        _ = self;
+    }
+
     fn firstChild(self: *const NodeIterator, node: *parser.Node) !?*parser.Node {
         const children = try parser.nodeGetChildNodes(node);
         const child_count = try parser.nodeListLength(children);
@@ -217,6 +253,18 @@ pub const NodeIterator = struct {
 
         return null;
     }
+
+    fn callbackStart(self: *NodeIterator) !void {
+        if (self.is_in_callback) {
+            // this is the correct DOMExeption
+            return error.InvalidState;
+        }
+        self.is_in_callback = true;
+    }
+
+    fn callbackEnd(self: *NodeIterator) void {
+        self.is_in_callback = false;
+    }
 };
 
 const testing = @import("../../testing.zig");

src/browser/dom/tree_walker.zig

@@ -33,12 +33,17 @@ pub const TreeWalker = struct {
     filter: ?TreeWalkerOpts,
     filter_func: ?Env.Function,
 
+    // One of the few cases where null and undefined resolve to different default.
+    // We need the raw JsObject so that we can probe the tri state:
+    // null, undefined or i32.
+    pub const WhatToShow = Env.JsObject;
+
     pub const TreeWalkerOpts = union(enum) {
         function: Env.Function,
         object: struct { acceptNode: Env.Function },
     };
 
-    pub fn init(node: *parser.Node, what_to_show: ?u32, filter: ?TreeWalkerOpts) !TreeWalker {
+    pub fn init(node: *parser.Node, what_to_show_: ?WhatToShow, filter: ?TreeWalkerOpts) !TreeWalker {
         var filter_func: ?Env.Function = null;
 
         if (filter) |f| {
@@ -48,10 +53,21 @@ pub const TreeWalker = struct {
             };
         }
 
+        var what_to_show: u32 = undefined;
+        if (what_to_show_) |wts| {
+            switch (try wts.triState(TreeWalker, "what_to_show", u32)) {
+                .null => what_to_show = 0,
+                .undefined => what_to_show = NodeFilter.NodeFilter._SHOW_ALL,
+                .value => |v| what_to_show = v,
+            }
+        } else {
+            what_to_show = NodeFilter.NodeFilter._SHOW_ALL;
+        }
+
         return .{
             .root = node,
             .current_node = node,
-            .what_to_show = what_to_show orelse NodeFilter.NodeFilter._SHOW_ALL,
+            .what_to_show = what_to_show,
             .filter = filter,
             .filter_func = filter_func,
         };

src/main_wpt.zig

@@ -263,30 +263,33 @@ const Writer = struct {
             if (line.len == 0) {
                 break;
             }
-            var fields = std.mem.splitScalar(u8, line, '|');
-            const case_name = fields.next() orelse {
-                std.debug.print("invalid result line: {s}\n", .{line});
-                return error.InvalidResult;
-            };
-
-            const text_status = fields.next() orelse {
-                std.debug.print("invalid result line: {s}\n", .{line});
-                return error.InvalidResult;
-            };
-
-            const case_pass = std.mem.eql(u8, text_status, "Pass");
-            if (case_pass) {
+            // case names can have | in them, so we can't simply split on |
+            var case_name = line;
+            var case_pass = false; // so pessimistic!
+            var case_message: []const u8 = "";
+
+            if (std.mem.endsWith(u8, line, "|Pass")) {
+                case_name = line[0 .. line.len - 5];
+                case_pass = true;
                 case_pass_count += 1;
             } else {
-                // If 1 case fails, we treat the entire file as a fail.
+                // both cases names and messages can have | in them. Our only
+                // chance to "parse" this is to anchor off the |Fail.
+                const pos = std.mem.indexOf(u8, line, "|Fail") orelse {
+                    std.debug.print("invalid result line: {s}\n", .{line});
+                    return error.InvalidResult;
+                };
+
+                case_name = line[0..pos];
+                case_message = line[pos + 1 ..];
                 pass = false;
                 case_fail_count += 1;
             }
 
             try cases.append(self.arena, .{
                 .name = case_name,
                 .pass = case_pass,
-                .message = fields.next(),
+                .message = case_message,
             });
         }
 

src/runtime/js.zig

@@ -941,6 +941,27 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
             fn jsValueToZig(self: *JsContext, comptime named_function: NamedFunction, comptime T: type, js_value: v8.Value) !T {
                 switch (@typeInfo(T)) {
                     .optional => |o| {
+                        if (comptime isJsObject(o.child)) {
+                            // If type type is a ?JsObject, then we want to pass
+                            // a JsObject, not null. Consider a function,
+                            //    _doSomething(arg: ?Env.JsObjet) void { ... }
+                            //
+                            // And then these three calls:
+                            //   doSomething();
+                            //   doSomething(null);
+                            //
+                            // In the first case, we'll pass `null`. But in the
+                            // second, we'll pass a JsObject which represents
+                            // null.
+                            // If we don't have this code, both cases will
+                            // pass in `null` and the the doSomething won't
+                            // be able to tell if `null` was explicitly passed
+                            // or whether no parameter was passed.
+                            return JsObject{
+                                .js_obj = js_value.castTo(v8.Object),
+                                .js_context = self,
+                            };
+                        }
                         if (js_value.isNullOrUndefined()) {
                             return null;
                         }
@@ -1938,6 +1959,24 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
                 return try js_context.createFunction(js_value);
             }
 
+            pub fn isNull(self: JsObject) bool {
+                return self.js_obj.toValue().isNull();
+            }
+
+            pub fn isUndefined(self: JsObject) bool {
+                return self.js_obj.toValue().isUndefined();
+            }
+
+            pub fn triState(self: JsObject, comptime Struct: type, comptime name: []const u8, comptime T: type) !TriState(T) {
+                if (self.isNull()) {
+                    return .{ .null = {} };
+                }
+                if (self.isUndefined()) {
+                    return .{ .undefined = {} };
+                }
+                return .{ .value = try self.toZig(Struct, name, T) };
+            }
+
             pub fn isNullOrUndefined(self: JsObject) bool {
                 return self.js_obj.toValue().isNullOrUndefined();
             }
@@ -1965,6 +2004,14 @@ pub fn Env(comptime State: type, comptime WebApis: type) type {
                 const named_function = comptime NamedFunction.init(Struct, name);
                 return self.js_context.jsValueToZig(named_function, T, self.js_obj.toValue());
             }
+
+            pub fn TriState(comptime T: type) type {
+                return union(enum) {
+                    null: void,
+                    undefined: void,
+                    value: T,
+                };
+            }
         };
 
         // This only exists so that we know whether a function wants the opaque