netsurf: move to public only API

And add some Node APIs:
- getters: firstChild, lastChild, nextSibling, previoussibling,
parentNode, parentElement, nodeName, nodeType, ownerDocument,
isConnected
- getters/setters: nodeValue, textContent
- methods: appendChild

And some test comptime optimizations on Document

Signed-off-by: Francis Bouvier <francis.bouvier@gmail.com>

src/dom.zig

@@ -5,6 +5,9 @@ const Console = @import("jsruntime").Console;
 // DOM
 const EventTarget = @import("dom/event_target.zig").EventTarget;
 const N = @import("dom/node.zig");
+const CharacterData = @import("dom/character_data.zig").CharacterData;
+const Comment = @import("dom/comment.zig").Comment;
+const Text = @import("dom/text.zig").Text;
 const Element = @import("dom/element.zig").Element;
 const Document = @import("dom/document.zig").Document;
 
@@ -22,6 +25,8 @@ const interfaces = .{
     EventTarget,
     N.Node,
     N.Types,
+    CharacterData,
+    Comment,
     Element,
     Document,
 

src/dom/character_data.zig

@@ -0,0 +1,20 @@
+const generate = @import("../generate.zig");
+const parser = @import("../netsurf.zig");
+
+const Node = @import("node.zig").Node;
+const Comment = @import("comment.zig").Comment;
+const Text = @import("text.zig").Text;
+
+pub const CharacterData = struct {
+    pub const Self = parser.CharacterData;
+    pub const prototype = *Node;
+    pub const mem_guarantied = true;
+};
+
+pub const Types = generate.Tuple(.{
+    Comment,
+    Text,
+});
+const Generated = generate.Union.compile(Types);
+pub const Union = Generated._union;
+pub const Tags = Generated._enum;

src/dom/comment.zig

@@ -0,0 +1,9 @@
+const parser = @import("../netsurf.zig");
+
+const CharacterData = @import("character_data.zig").CharacterData;
+
+pub const Comment = struct {
+    pub const Self = parser.Comment;
+    pub const prototype = *CharacterData;
+    pub const mem_guarantied = true;
+};

src/dom/node.zig

@@ -1,10 +1,14 @@
 const std = @import("std");
 
+const jsruntime = @import("jsruntime");
+const Case = jsruntime.test_utils.Case;
+const checkCases = jsruntime.test_utils.checkCases;
 const generate = @import("../generate.zig");
 
 const parser = @import("../netsurf.zig");
 
 const EventTarget = @import("event_target.zig").EventTarget;
+const CData = @import("character_data.zig");
 const HTMLDocument = @import("../html/document.zig").HTMLDocument;
 const HTMLElem = @import("../html/elements.zig");
 
@@ -12,12 +16,241 @@ pub const Node = struct {
     pub const Self = parser.Node;
     pub const prototype = *EventTarget;
     pub const mem_guarantied = true;
+
+    pub fn toInterface(node: *parser.Node) Union {
+        return switch (parser.nodeType(node)) {
+            .element => HTMLElem.toInterface(Union, @as(*parser.Element, @ptrCast(node))),
+            .comment => .{ .Comment = @as(*parser.Comment, @ptrCast(node)) },
+            .text => .{ .Text = @as(*parser.Text, @ptrCast(node)) },
+            .document => .{ .HTMLDocument = @as(*parser.DocumentHTML, @ptrCast(node)) },
+            else => @panic("node type not handled"), // TODO
+        };
+    }
+
+    // JS funcs
+    // --------
+
+    // Read-only attributes
+
+    pub fn get_firstChild(self: *parser.Node) ?Union {
+        const res = parser.nodeFirstChild(self);
+        if (res == null) {
+            return null;
+        }
+        return Node.toInterface(res.?);
+    }
+
+    pub fn get_lastChild(self: *parser.Node) ?Union {
+        const res = parser.nodeLastChild(self);
+        if (res == null) {
+            return null;
+        }
+        return Node.toInterface(res.?);
+    }
+
+    pub fn get_nextSibling(self: *parser.Node) ?Union {
+        const res = parser.nodeNextSibling(self);
+        if (res == null) {
+            return null;
+        }
+        return Node.toInterface(res.?);
+    }
+
+    pub fn get_previousSibling(self: *parser.Node) ?Union {
+        const res = parser.nodePreviousSibling(self);
+        if (res == null) {
+            return null;
+        }
+        return Node.toInterface(res.?);
+    }
+
+    pub fn get_parentNode(self: *parser.Node) ?Union {
+        const res = parser.nodeParentNode(self);
+        if (res == null) {
+            return null;
+        }
+        return Node.toInterface(res.?);
+    }
+
+    pub fn get_parentElement(self: *parser.Node) ?HTMLElem.Union {
+        const res = parser.nodeParentElement(self);
+        if (res == null) {
+            return null;
+        }
+        return HTMLElem.toInterface(HTMLElem.Union, @as(*parser.Element, @ptrCast(res.?)));
+    }
+
+    pub fn get_nodeName(self: *parser.Node) []const u8 {
+        return parser.nodeName(self);
+    }
+
+    pub fn get_nodeType(self: *parser.Node) u8 {
+        return @intFromEnum(parser.nodeType(self));
+    }
+
+    pub fn get_ownerDocument(self: *parser.Node) ?*parser.DocumentHTML {
+        const res = parser.nodeOwnerDocument(self);
+        if (res == null) {
+            return null;
+        }
+        return @as(*parser.DocumentHTML, @ptrCast(res.?));
+    }
+
+    pub fn get_isConnected(self: *parser.Node) bool {
+        // TODO: handle Shadow DOM
+        if (parser.nodeType(self) == .document) {
+            return true;
+        }
+        return Node.get_parentNode(self) != null;
+    }
+
+    // Read/Write attributes
+
+    pub fn get_nodeValue(self: *parser.Node) ?[]const u8 {
+        return parser.nodeValue(self);
+    }
+
+    pub fn set_nodeValue(self: *parser.Node, data: []u8) void {
+        parser.nodeSetValue(self, data);
+    }
+
+    pub fn get_textContent(self: *parser.Node) ?[]const u8 {
+        return parser.nodeTextContent(self);
+    }
+
+    pub fn set_textContent(self: *parser.Node, data: []u8) void {
+        return parser.nodeSetTextContent(self, data);
+    }
+
+    // Methods
+
+    pub fn _appendChild(self: *parser.Node, child: *parser.Node) Union {
+        // TODO: DocumentFragment special case
+        const res = parser.nodeAppendChild(self, child);
+        return Node.toInterface(res);
+    }
 };
 
 pub const Types = generate.Tuple(.{
+    CData.Types,
     HTMLElem.Types,
     HTMLDocument,
 });
 const Generated = generate.Union.compile(Types);
 pub const Union = Generated._union;
 pub const Tags = Generated._enum;
+
+// Tests
+// -----
+
+pub fn testExecFn(
+    _: std.mem.Allocator,
+    js_env: *jsruntime.Env,
+    comptime _: []jsruntime.API,
+) !void {
+    var first_child = [_]Case{
+        // for next test cases
+        .{ .src = "let content = document.getElementById('content')", .ex = "undefined" },
+        .{ .src = "let link = document.getElementById('link')", .ex = "undefined" },
+
+        .{ .src = "let first_child = document.body.firstChild", .ex = "undefined" },
+        .{ .src = "first_child.localName", .ex = "div" },
+        .{ .src = "first_child.__proto__.constructor.name", .ex = "HTMLDivElement" },
+        .{ .src = "document.getElementById('para-empty').firstChild.firstChild", .ex = "null" },
+    };
+    try checkCases(js_env, &first_child);
+
+    var last_child = [_]Case{
+        .{ .src = "let last_child = content.lastChild", .ex = "undefined" },
+        .{ .src = "last_child.__proto__.constructor.name", .ex = "Comment" },
+    };
+    try checkCases(js_env, &last_child);
+
+    var next_sibling = [_]Case{
+        .{ .src = "let next_sibling = link.nextSibling", .ex = "undefined" },
+        .{ .src = "next_sibling.localName", .ex = "p" },
+        .{ .src = "next_sibling.__proto__.constructor.name", .ex = "HTMLParagraphElement" },
+        .{ .src = "content.nextSibling", .ex = "null" },
+    };
+    try checkCases(js_env, &next_sibling);
+
+    var prev_sibling = [_]Case{
+        .{ .src = "let prev_sibling = document.getElementById('para-empty').previousSibling", .ex = "undefined" },
+        .{ .src = "prev_sibling.localName", .ex = "a" },
+        .{ .src = "prev_sibling.__proto__.constructor.name", .ex = "HTMLAnchorElement" },
+        .{ .src = "content.previousSibling", .ex = "null" },
+    };
+    try checkCases(js_env, &prev_sibling);
+
+    var parent = [_]Case{
+        .{ .src = "let parent = document.getElementById('para').parentElement", .ex = "undefined" },
+        .{ .src = "parent.localName", .ex = "div" },
+        .{ .src = "parent.__proto__.constructor.name", .ex = "HTMLDivElement" },
+        .{ .src = "let h = content.parentElement.parentElement", .ex = "undefined" },
+        .{ .src = "h.parentElement", .ex = "null" },
+        .{ .src = "h.parentNode.__proto__.constructor.name", .ex = "HTMLDocument" },
+    };
+    try checkCases(js_env, &parent);
+
+    var node_name = [_]Case{
+        .{ .src = "content.firstChild.nodeName === 'A'", .ex = "true" },
+        .{ .src = "link.firstChild.nodeName === '#text'", .ex = "true" },
+        .{ .src = "content.lastChild.nodeName === '#comment'", .ex = "true" },
+        .{ .src = "document.nodeName === '#document'", .ex = "true" },
+    };
+    try checkCases(js_env, &node_name);
+
+    var node_type = [_]Case{
+        .{ .src = "content.firstChild.nodeType === 1", .ex = "true" },
+        .{ .src = "link.firstChild.nodeType === 3", .ex = "true" },
+        .{ .src = "content.lastChild.nodeType === 8", .ex = "true" },
+        .{ .src = "document.nodeType === 9", .ex = "true" },
+    };
+    try checkCases(js_env, &node_type);
+
+    var owner = [_]Case{
+        .{ .src = "let owner = content.ownerDocument", .ex = "undefined" },
+        .{ .src = "owner.__proto__.constructor.name", .ex = "HTMLDocument" },
+        .{ .src = "document.ownerDocument", .ex = "null" },
+        .{ .src = "let owner2 = document.createElement('div').ownerDocument", .ex = "undefined" },
+        .{ .src = "owner2.__proto__.constructor.name", .ex = "HTMLDocument" },
+    };
+    try checkCases(js_env, &owner);
+
+    var connected = [_]Case{
+        .{ .src = "content.isConnected", .ex = "true" },
+        .{ .src = "document.isConnected", .ex = "true" },
+        .{ .src = "document.createElement('div').isConnected", .ex = "false" },
+    };
+    try checkCases(js_env, &connected);
+
+    var node_value = [_]Case{
+        .{ .src = "content.lastChild.nodeValue === 'comment'", .ex = "true" },
+        .{ .src = "link.nodeValue === null", .ex = "true" },
+        .{ .src = "let text = link.firstChild", .ex = "undefined" },
+        .{ .src = "text.nodeValue === 'OK'", .ex = "true" },
+        .{ .src = "text.nodeValue = 'OK modified'", .ex = "OK modified" },
+        .{ .src = "text.nodeValue === 'OK modified'", .ex = "true" },
+        .{ .src = "link.nodeValue = 'nothing'", .ex = "nothing" },
+    };
+    try checkCases(js_env, &node_value);
+
+    var node_text_content = [_]Case{
+        .{ .src = "text.textContent === 'OK modified'", .ex = "true" },
+        .{ .src = "content.textContent === 'OK modified And'", .ex = "true" },
+        .{ .src = "text.textContent = 'OK'", .ex = "OK" },
+        .{ .src = "text.textContent", .ex = "OK" },
+        .{ .src = "document.getElementById('para-empty').textContent", .ex = "" },
+        .{ .src = "document.getElementById('para-empty').textContent = 'OK'", .ex = "OK" },
+        .{ .src = "document.getElementById('para-empty').firstChild.nodeName === '#text'", .ex = "true" },
+    };
+    try checkCases(js_env, &node_text_content);
+
+    var node_append_child = [_]Case{
+        .{ .src = "let append = document.createElement('h1')", .ex = "undefined" },
+        .{ .src = "content.appendChild(append).toString()", .ex = "[object HTMLHeadingElement]" },
+        .{ .src = "content.lastChild.__proto__.constructor.name", .ex = "HTMLHeadingElement" },
+        .{ .src = "content.appendChild(link).toString()", .ex = "[object HTMLAnchorElement]" },
+    };
+    try checkCases(js_env, &node_append_child);
+}

src/dom/text.zig

@@ -0,0 +1,9 @@
+const parser = @import("../netsurf.zig");
+
+const CharacterData = @import("character_data.zig").CharacterData;
+
+pub const Text = struct {
+    pub const Self = parser.Text;
+    pub const prototype = *CharacterData;
+    pub const mem_guarantied = true;
+};

src/html/document.zig

@@ -41,7 +41,7 @@ pub const HTMLDocument = struct {
 // -----
 
 pub fn testExecFn(
-    alloc: std.mem.Allocator,
+    _: std.mem.Allocator,
     js_env: *jsruntime.Env,
     comptime _: []jsruntime.API,
 ) !void {
@@ -50,7 +50,7 @@ pub fn testExecFn(
         .{ .src = "document.__proto__.__proto__.constructor.name", .ex = "Document" },
         .{ .src = "document.__proto__.__proto__.__proto__.constructor.name", .ex = "Node" },
         .{ .src = "document.__proto__.__proto__.__proto__.__proto__.constructor.name", .ex = "EventTarget" },
-        .{ .src = "document.body.localName === 'body'", .ex = "true" },
+        .{ .src = "document.body.localName == 'body'", .ex = "true" },
     };
     try checkCases(js_env, &constructor);
 
@@ -63,31 +63,24 @@ pub fn testExecFn(
 
     const tags = comptime parser.Tag.all();
     const elements = comptime parser.Tag.allElements();
-    var createElements: [(tags.len - 1) * 3]Case = undefined;
-    inline for (tags, 0..) |tag, i| {
-        if (tag == .undef) {
-            continue;
-        }
+    comptime var createElements: [(tags.len) * 3]Case = undefined;
+    inline for (tags, elements, 0..) |tag, element_name, i| {
+        // if (tag == .undef) {
+        //     continue;
+        // }
         const tag_name = @tagName(tag);
-        const element_name = elements[i];
         createElements[i * 3] = Case{
-            .src = try std.fmt.allocPrint(alloc, "var {s}Elem = document.createElement('{s}')", .{ tag_name, tag_name }),
+            .src = "var " ++ tag_name ++ "Elem = document.createElement('" ++ tag_name ++ "')",
             .ex = "undefined",
         };
         createElements[(i * 3) + 1] = Case{
-            .src = try std.fmt.allocPrint(alloc, "{s}Elem.constructor.name", .{tag_name}),
-            .ex = try std.fmt.allocPrint(alloc, "HTML{s}Element", .{element_name}),
+            .src = tag_name ++ "Elem.constructor.name",
+            .ex = "HTML" ++ element_name ++ "Element",
         };
         createElements[(i * 3) + 2] = Case{
-            .src = try std.fmt.allocPrint(alloc, "{s}Elem.localName", .{tag_name}),
+            .src = tag_name ++ "Elem.localName",
             .ex = tag_name,
         };
     }
     try checkCases(js_env, &createElements);
-
-    var unknown = [_]Case{
-        .{ .src = "let unknown = document.createElement('unknown')", .ex = "undefined" },
-        .{ .src = "unknown.constructor.name", .ex = "HTMLUnknownElement" },
-    };
-    try checkCases(js_env, &unknown);
 }

src/html/elements.zig

@@ -454,7 +454,8 @@ pub const HTMLVideoElement = struct {
     pub const mem_guarantied = true;
 };
 
-pub fn toInterface(comptime T: type, elem: *parser.Element) T {
+pub fn toInterface(comptime T: type, e: *parser.Element) T {
+    const elem: *align(@alignOf(*parser.Element)) parser.Element = @alignCast(e);
     const tag = parser.elementHTMLGetTagType(@as(*parser.ElementHTML, @ptrCast(elem)));
     return switch (tag) {
         .a => .{ .HTMLAnchorElement = @as(*parser.Anchor, @ptrCast(elem)) },

src/main.zig

@@ -4,8 +4,8 @@ const jsruntime = @import("jsruntime");
 
 const parser = @import("netsurf.zig");
 const DOM = @import("dom.zig");
-
-const html_test = @import("html_test.zig").html;
+const docTestExecFn = @import("html/document.zig").testExecFn;
+const nodeTestExecFn = @import("dom/node.zig").testExecFn;
 
 const socket_path = "/tmp/browsercore-server.sock";
 
@@ -45,6 +45,24 @@ fn execJS(
     }
 }
 
+fn testsExecFn(
+    alloc: std.mem.Allocator,
+    js_env: *jsruntime.Env,
+    comptime apis: []jsruntime.API,
+) !void {
+
+    // start JS env
+    js_env.start(apis);
+    defer js_env.stop();
+
+    // add document object
+    try js_env.addObject(apis, doc, "document");
+
+    // run tests
+    try docTestExecFn(alloc, js_env, apis);
+    try nodeTestExecFn(alloc, js_env, apis);
+}
+
 pub fn main() !void {
 
     // generate APIs
@@ -55,30 +73,35 @@ pub fn main() !void {
     defer vm.deinit();
 
     // document
-
-    // remove socket file of internal server
-    // reuse_address (SO_REUSEADDR flag) does not seems to work on unix socket
-    // see: https://gavv.net/articles/unix-socket-reuse/
-    // TODO: use a lock file instead
-    std.os.unlink(socket_path) catch |err| {
-        if (err != error.FileNotFound) {
-            return err;
-        }
-    };
     var f = "test.html".*;
     doc = parser.documentHTMLParse(&f);
     // TODO: defer doc?
 
+    // // remove socket file of internal server
+    // // reuse_address (SO_REUSEADDR flag) does not seems to work on unix socket
+    // // see: https://gavv.net/articles/unix-socket-reuse/
+    // // TODO: use a lock file instead
+    // std.os.unlink(socket_path) catch |err| {
+    //     if (err != error.FileNotFound) {
+    //         return err;
+    //     }
+    // };
+
     // alloc
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-    defer arena.deinit();
+    // var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    // defer arena.deinit();
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    var bench_alloc = jsruntime.bench_allocator(gpa.allocator());
+    var arena_alloc = std.heap.ArenaAllocator.init(bench_alloc.allocator());
+    defer arena_alloc.deinit();
 
-    // server
-    var addr = try std.net.Address.initUnix(socket_path);
-    server = std.net.StreamServer.init(.{});
-    defer server.deinit();
-    try server.listen(addr);
-    std.debug.print("Listening on: {s}...\n", .{socket_path});
+    // // server
+    // var addr = try std.net.Address.initUnix(socket_path);
+    // server = std.net.StreamServer.init(.{});
+    // defer server.deinit();
+    // try server.listen(addr);
+    // std.debug.print("Listening on: {s}...\n", .{socket_path});
 
-    try jsruntime.loadEnv(&arena, execJS, apis);
+    // try jsruntime.loadEnv(&arena, execJS, apis);
+    try jsruntime.loadEnv(&arena_alloc, testsExecFn, apis);
 }

src/netsurf.zig

@@ -1,62 +1,17 @@
 const std = @import("std");
 
-const cp = @cImport({
+const c = @cImport({
     @cInclude("wrapper.h");
 });
 
-const c = @cImport({
-    @cInclude("core/node.h");
-    @cInclude("core/document.h");
-    @cInclude("core/element.h");
+// Internal
 
-    @cInclude("html/html_document.h");
-    @cInclude("html/html_element.h");
-    @cInclude("html/html_anchor_element.h");
-    @cInclude("html/html_area_element.h");
-    @cInclude("html/html_br_element.h");
-    @cInclude("html/html_base_element.h");
-    @cInclude("html/html_body_element.h");
-    @cInclude("html/html_button_element.h");
-    @cInclude("html/html_canvas_element.h");
-    @cInclude("html/html_dlist_element.h");
-    @cInclude("html/html_div_element.h");
-    @cInclude("html/html_fieldset_element.h");
-    @cInclude("html/html_form_element.h");
-    @cInclude("html/html_frameset_element.h");
-    @cInclude("html/html_hr_element.h");
-    @cInclude("html/html_head_element.h");
-    @cInclude("html/html_heading_element.h");
-    @cInclude("html/html_html_element.h");
-    @cInclude("html/html_iframe_element.h");
-    @cInclude("html/html_image_element.h");
-    @cInclude("html/html_input_element.h");
-    @cInclude("html/html_li_element.h");
-    @cInclude("html/html_label_element.h");
-    @cInclude("html/html_legend_element.h");
-    @cInclude("html/html_link_element.h");
-    @cInclude("html/html_map_element.h");
-    @cInclude("html/html_meta_element.h");
-    @cInclude("html/html_mod_element.h");
-    @cInclude("html/html_olist_element.h");
-    @cInclude("html/html_object_element.h");
-    @cInclude("html/html_opt_group_element.h");
-    @cInclude("html/html_option_element.h");
-    @cInclude("html/html_paragraph_element.h");
-    @cInclude("html/html_pre_element.h");
-    @cInclude("html/html_quote_element.h");
-    @cInclude("html/html_script_element.h");
-    @cInclude("html/html_select_element.h");
-    @cInclude("html/html_style_element.h");
-    @cInclude("html/html_table_element.h");
-    @cInclude("html/html_tablecaption_element.h");
-    @cInclude("html/html_tablecell_element.h");
-    @cInclude("html/html_tablecol_element.h");
-    @cInclude("html/html_tablerow_element.h");
-    @cInclude("html/html_tablesection_element.h");
-    @cInclude("html/html_text_area_element.h");
-    @cInclude("html/html_title_element.h");
-    @cInclude("html/html_ulist_element.h");
-});
+inline fn getVtable(comptime VtableT: type, comptime NodeT: type, node: anytype) VtableT {
+    const node_algined: *align(@alignOf([*c]c.dom_node)) NodeT = @alignCast(node);
+    const base = @as([*c]c.dom_node, @ptrCast(node_algined));
+    const vtable_aligned: *align(@alignOf([*c]VtableT)) const anyopaque = @alignCast(base.*.vtable.?);
+    return @as([*c]const VtableT, @ptrCast(vtable_aligned)).*;
+}
 
 // Utils
 const String = c.dom_string;
@@ -67,7 +22,7 @@ inline fn stringToData(s: *String) []const u8 {
 }
 
 inline fn stringFromData(data: []const u8) *String {
-    var s: ?*String = null;
+    var s: ?*String = undefined;
     _ = c.dom_string_create(data.ptr, data.len, &s);
     return s.?;
 }
@@ -218,49 +173,187 @@ pub const Tag = enum(u8) {
 // EventTarget
 pub const EventTarget = c.dom_event_target;
 
+// NodeType
+
+pub const NodeType = enum(u4) {
+    element = c.DOM_ELEMENT_NODE,
+    attribute = c.DOM_ATTRIBUTE_NODE,
+    text = c.DOM_TEXT_NODE,
+    cdata_section = c.DOM_CDATA_SECTION_NODE,
+    entity_reference = c.DOM_ENTITY_REFERENCE_NODE, // historical
+    entity = c.DOM_ENTITY_NODE, // historical
+    processing_instruction = c.DOM_PROCESSING_INSTRUCTION_NODE,
+    comment = c.DOM_COMMENT_NODE,
+    document = c.DOM_DOCUMENT_NODE,
+    document_type = c.DOM_DOCUMENT_TYPE_NODE,
+    document_fragment = c.DOM_DOCUMENT_FRAGMENT_NODE,
+    notation = c.DOM_NOTATION_NODE, // historical
+};
+
 // Node
 pub const Node = c.dom_node_internal;
 
+fn nodeVtable(node: *Node) c.dom_node_vtable {
+    return getVtable(c.dom_node_vtable, Node, node);
+}
+
+pub fn nodeLocalName(node: *Node) []const u8 {
+    var s: ?*String = undefined;
+    _ = nodeVtable(node).dom_node_get_local_name.?(node, &s);
+    var s_lower: ?*String = undefined;
+    _ = c.dom_string_tolower(s, true, &s_lower);
+    return stringToData(s_lower.?);
+}
+
+pub fn nodeType(node: *Node) NodeType {
+    var node_type: c.dom_node_type = undefined;
+    _ = nodeVtable(node).dom_node_get_node_type.?(node, &node_type);
+    return @as(NodeType, @enumFromInt(node_type));
+}
+
+pub fn nodeFirstChild(node: *Node) ?*Node {
+    var res: ?*Node = undefined;
+    _ = nodeVtable(node).dom_node_get_first_child.?(node, &res);
+    return res;
+}
+
+pub fn nodeLastChild(node: *Node) ?*Node {
+    var res: ?*Node = undefined;
+    _ = nodeVtable(node).dom_node_get_last_child.?(node, &res);
+    return res;
+}
+
+pub fn nodeNextSibling(node: *Node) ?*Node {
+    var res: ?*Node = undefined;
+    _ = nodeVtable(node).dom_node_get_next_sibling.?(node, &res);
+    return res;
+}
+
+pub fn nodePreviousSibling(node: *Node) ?*Node {
+    var res: ?*Node = undefined;
+    _ = nodeVtable(node).dom_node_get_previous_sibling.?(node, &res);
+    return res;
+}
+
+pub fn nodeParentNode(node: *Node) ?*Node {
+    var res: ?*Node = undefined;
+    _ = nodeVtable(node).dom_node_get_parent_node.?(node, &res);
+    return res;
+}
+
+pub fn nodeParentElement(node: *Node) ?*Element {
+    const res = nodeParentNode(node);
+    if (res) |value| {
+        if (nodeType(value) == .element) {
+            return @as(*Element, @ptrCast(value));
+        }
+    }
+    return null;
+}
+
+pub fn nodeName(node: *Node) []const u8 {
+    var s: ?*String = undefined;
+    _ = nodeVtable(node).dom_node_get_node_name.?(node, &s);
+    return stringToData(s.?);
+}
+
+pub fn nodeOwnerDocument(node: *Node) ?*Document {
+    var doc: ?*Document = undefined;
+    _ = nodeVtable(node).dom_node_get_owner_document.?(node, &doc);
+    return doc;
+}
+
+pub fn nodeValue(node: *Node) ?[]const u8 {
+    var s: ?*String = undefined;
+    _ = nodeVtable(node).dom_node_get_node_value.?(node, &s);
+    if (s == null) {
+        return null;
+    }
+    return stringToData(s.?);
+}
+
+pub fn nodeSetValue(node: *Node, value: []const u8) void {
+    const s = stringFromData(value);
+    _ = nodeVtable(node).dom_node_set_node_value.?(node, s);
+}
+
+pub fn nodeTextContent(node: *Node) ?[]const u8 {
+    var s: ?*String = undefined;
+    _ = nodeVtable(node).dom_node_get_text_content.?(node, &s);
+    if (s == null) {
+        // NOTE: it seems that there is a bug in netsurf implem
+        // an empty Element should return an empty string and not null
+        if (nodeType(node) == .element) {
+            return "";
+        }
+        return null;
+    }
+    return stringToData(s.?);
+}
+
+pub fn nodeSetTextContent(node: *Node, value: []const u8) void {
+    const s = stringFromData(value);
+    _ = nodeVtable(node).dom_node_set_text_content.?(node, s);
+}
+
+pub fn nodeAppendChild(node: *Node, child: *Node) *Node {
+    var res: ?*Node = undefined;
+    _ = nodeVtable(node).dom_node_append_child.?(node, child, &res);
+    return res.?;
+}
+
+// CharacterData
+pub const CharacterData = c.dom_characterdata;
+
+// Text
+pub const Text = c.dom_text;
+
+// Comment
+pub const Comment = c.dom_comment;
+
 // Element
 pub const Element = c.dom_element;
 
+fn elementVtable(elem: *Element) c.dom_element_vtable {
+    return getVtable(c.dom_element_vtable, Element, elem);
+}
+
 pub fn elementLocalName(elem: *Element) []const u8 {
-    const elem_aligned: *align(8) Element = @alignCast(elem);
-    const node = @as(*Node, @ptrCast(elem_aligned));
-    var s: ?*String = null;
-    _ = c._dom_node_get_local_name(node, &s);
-    var s_lower: ?*String = null;
-    _ = c.dom_string_tolower(s, true, &s_lower);
-    return stringToData(s_lower.?);
+    const node = @as(*Node, @ptrCast(elem));
+    return nodeLocalName(node);
 }
 
 // ElementHTML
 pub const ElementHTML = c.dom_html_element;
 
+fn elementHTMLVtable(elem_html: *ElementHTML) c.dom_html_element_vtable {
+    return getVtable(c.dom_html_element_vtable, ElementHTML, elem_html);
+}
+
 pub fn elementHTMLGetTagType(elem_html: *ElementHTML) Tag {
     var tag_type: c.dom_html_element_type = undefined;
-    _ = c._dom_html_element_get_tag_type(elem_html, &tag_type);
+    _ = elementHTMLVtable(elem_html).dom_html_element_get_tag_type.?(elem_html, &tag_type);
     return @as(Tag, @enumFromInt(tag_type));
 }
 
 // ElementsHTML
 
-pub const MediaElement = struct { base: c.dom_html_element };
+pub const MediaElement = struct { base: *c.dom_html_element };
 
-pub const Unknown = struct { base: c.dom_html_element };
+pub const Unknown = struct { base: *c.dom_html_element };
 pub const Anchor = c.dom_html_anchor_element;
 pub const Area = c.dom_html_area_element;
-pub const Audio = struct { base: c.dom_html_element };
+pub const Audio = struct { base: *c.dom_html_element };
 pub const BR = c.dom_html_br_element;
 pub const Base = c.dom_html_base_element;
 pub const Body = c.dom_html_body_element;
 pub const Button = c.dom_html_button_element;
 pub const Canvas = c.dom_html_canvas_element;
 pub const DList = c.dom_html_dlist_element;
-pub const Data = struct { base: c.dom_html_element };
-pub const Dialog = struct { base: c.dom_html_element };
+pub const Data = struct { base: *c.dom_html_element };
+pub const Dialog = struct { base: *c.dom_html_element };
 pub const Div = c.dom_html_div_element;
-pub const Embed = struct { base: c.dom_html_element };
+pub const Embed = struct { base: *c.dom_html_element };
 pub const FieldSet = c.dom_html_field_set_element;
 pub const Form = c.dom_html_form_element;
 pub const FrameSet = c.dom_html_frame_set_element;
@@ -277,22 +370,22 @@ pub const Legend = c.dom_html_legend_element;
 pub const Link = c.dom_html_link_element;
 pub const Map = c.dom_html_map_element;
 pub const Meta = c.dom_html_meta_element;
-pub const Meter = struct { base: c.dom_html_element };
+pub const Meter = struct { base: *c.dom_html_element };
 pub const Mod = c.dom_html_mod_element;
 pub const OList = c.dom_html_olist_element;
 pub const Object = c.dom_html_object_element;
 pub const OptGroup = c.dom_html_opt_group_element;
 pub const Option = c.dom_html_option_element;
-pub const Output = struct { base: c.dom_html_element };
+pub const Output = struct { base: *c.dom_html_element };
 pub const Paragraph = c.dom_html_paragraph_element;
-pub const Picture = struct { base: c.dom_html_element };
+pub const Picture = struct { base: *c.dom_html_element };
 pub const Pre = c.dom_html_pre_element;
-pub const Progress = struct { base: c.dom_html_element };
+pub const Progress = struct { base: *c.dom_html_element };
 pub const Quote = c.dom_html_quote_element;
 pub const Script = c.dom_html_script_element;
 pub const Select = c.dom_html_select_element;
-pub const Source = struct { base: c.dom_html_element };
-pub const Span = struct { base: c.dom_html_element };
+pub const Source = struct { base: *c.dom_html_element };
+pub const Span = struct { base: *c.dom_html_element };
 pub const Style = c.dom_html_style_element;
 pub const Table = c.dom_html_table_element;
 pub const TableCaption = c.dom_html_table_caption_element;
@@ -300,39 +393,57 @@ pub const TableCell = c.dom_html_table_cell_element;
 pub const TableCol = c.dom_html_table_col_element;
 pub const TableRow = c.dom_html_table_row_element;
 pub const TableSection = c.dom_html_table_section_element;
-pub const Template = struct { base: c.dom_html_element };
+pub const Template = struct { base: *c.dom_html_element };
 pub const TextArea = c.dom_html_text_area_element;
-pub const Time = struct { base: c.dom_html_element };
+pub const Time = struct { base: *c.dom_html_element };
 pub const Title = c.dom_html_title_element;
-pub const Track = struct { base: c.dom_html_element };
+pub const Track = struct { base: *c.dom_html_element };
 pub const UList = c.dom_html_u_list_element;
-pub const Video = struct { base: c.dom_html_element };
+pub const Video = struct { base: *c.dom_html_element };
+
+// Document Position
+
+pub const DocumentPosition = enum(u2) {
+    disconnected = c.DOM_DOCUMENT_POSITION_DISCONNECTED,
+    preceding = c.DOM_DOCUMENT_POSITION_PRECEDING,
+    following = c.DOM_DOCUMENT_POSITION_FOLLOWING,
+    contains = c.DOM_DOCUMENT_POSITION_CONTAINS,
+    contained_by = c.DOM_DOCUMENT_POSITION_CONTAINED_BY,
+    implementation_specific = c.DOM_DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC,
+};
 
 // Document
 pub const Document = c.dom_document;
 
+fn documentVtable(doc: *Document) c.dom_document_vtable {
+    return getVtable(c.dom_document_vtable, Document, doc);
+}
+
 pub inline fn documentGetElementById(doc: *Document, id: []const u8) ?*Element {
     var elem: ?*Element = undefined;
-    _ = c._dom_document_get_element_by_id(doc, stringFromData(id), &elem);
+    _ = documentVtable(doc).dom_document_get_element_by_id.?(doc, stringFromData(id), &elem);
     return elem;
 }
 
 pub inline fn documentCreateElement(doc: *Document, tag_name: []const u8) *Element {
     var elem: ?*Element = undefined;
-    _ = c._dom_html_document_create_element(doc, stringFromData(tag_name), &elem);
+    _ = documentVtable(doc).dom_document_create_element.?(doc, stringFromData(tag_name), &elem);
     return elem.?;
 }
 
 // DocumentHTML
 pub const DocumentHTML = c.dom_html_document;
 
+fn documentHTMLVtable(doc_html: *DocumentHTML) c.dom_html_document_vtable {
+    return getVtable(c.dom_html_document_vtable, DocumentHTML, doc_html);
+}
+
 pub fn documentHTMLParse(filename: []u8) *DocumentHTML {
-    const doc = cp.wr_create_doc_dom_from_file(filename.ptr);
+    const doc = c.wr_create_doc_dom_from_file(filename.ptr);
     if (doc == null) {
         @panic("error parser");
     }
-    const doc_aligned: *align(@alignOf((DocumentHTML))) cp.dom_document = @alignCast(doc.?);
-    return @as(*DocumentHTML, @ptrCast(doc_aligned));
+    return @as(*DocumentHTML, @ptrCast(doc.?));
 }
 
 pub inline fn documentHTMLToDocument(doc_html: *DocumentHTML) *Document {
@@ -341,9 +452,9 @@ pub inline fn documentHTMLToDocument(doc_html: *DocumentHTML) *Document {
 
 pub inline fn documentHTMLBody(doc_html: *DocumentHTML) ?*Body {
     var body: ?*ElementHTML = undefined;
-    _ = c._dom_html_document_get_body(doc_html, &body);
-    if (body) |value| {
-        return @as(*Body, @ptrCast(value));
+    _ = documentHTMLVtable(doc_html).get_body.?(doc_html, &body);
+    if (body == null) {
+        return null;
     }
-    return null;
+    return @as(*Body, @ptrCast(body.?));
 }

src/run_tests.zig

@@ -5,7 +5,8 @@ const generate = @import("generate.zig");
 
 const parser = @import("netsurf.zig");
 const DOM = @import("dom.zig");
-const testExecFn = @import("html/document.zig").testExecFn;
+const docTestExecFn = @import("html/document.zig").testExecFn;
+const nodeTestExecFn = @import("html/document.zig").testExecFn;
 
 var doc: *parser.DocumentHTML = undefined;
 
@@ -23,7 +24,8 @@ fn testsExecFn(
     try js_env.addObject(apis, doc, "document");
 
     // run tests
-    try testExecFn(alloc, js_env, apis);
+    try docTestExecFn(alloc, js_env, apis);
+    try nodeTestExecFn(alloc, js_env, apis);
 }
 
 test {

test.html

@@ -1,8 +1 @@
-<div id='content'>
-  <a id='link' href='foo'>OK</a>
-  <p id='para-empty'>
-    <span id='para-empty-child'></span>
-  </p>
-  <p id='para'> And</p>
-  <!--comment-->
-</div>
+<div id='content'><a id='link' href='foo'>OK</a><p id='para-empty'><span id='para-empty-child'></span></p><p id='para'> And</p><!--comment--></div>