dom: add document.createElement and document.getElementById

src/dom/document.zig

@@ -3,7 +3,9 @@ const std = @import("std");
 const parser = @import("../netsurf.zig");
 
 const Node = @import("node.zig").Node;
+const NodeUnion = @import("node.zig").Union;
 const Element = @import("element.zig").Element;
+const HTMLBodyElement = @import("../html/elements.zig").HTMLBodyElement;
 
 pub const Document = struct {
     pub const Self = parser.Document;
@@ -15,20 +17,21 @@ pub const Document = struct {
     //     return .{};
     // }
 
-    pub fn getElementById(self: *parser.Document, id: []const u8) ?*parser.Element {
-        return parser.documentGetElementById(self, id);
-    }
-
     // JS funcs
     // --------
 
-    pub fn get_body(_: *parser.Document) ?*parser.Body {
-        // TODO
-        return null;
+    pub fn get_body(self: *parser.Document) ?*HTMLBodyElement {
+        const b = parser.documentBody(self) orelse null;
+        return @as(*HTMLBodyElement, @ptrCast(b));
     }
 
-    pub fn _getElementById(_: *parser.Document, _: []u8) ?*parser.Element {
-        // TODO
-        return null;
+    pub fn _getElementById(self: *parser.Document, id: []const u8) ?NodeUnion {
+        const e = parser.documentGetElementById(self, id) orelse return null;
+        return Element.toInterface(e);
+    }
+
+    pub fn _createElement(self: *parser.Document, tag_name: []const u8) NodeUnion {
+        const e = parser.documentCreateElement(self, tag_name);
+        return Element.toInterface(e);
     }
 };

src/dom/element.zig

@@ -3,12 +3,18 @@ const std = @import("std");
 const parser = @import("../netsurf.zig");
 
 const Node = @import("node.zig").Node;
+const Union = @import("node.zig").Union;
 
 pub const Element = struct {
     pub const Self = parser.Element;
     pub const prototype = *Node;
     pub const mem_guarantied = true;
 
+    pub fn toInterface(e: *parser.Element) Union {
+        const n = @as(*parser.Node, @ptrCast(e));
+        return Node.toInterface(n);
+    }
+
     // JS funcs
     // --------
 

src/netsurf.zig

@@ -671,6 +671,16 @@ pub inline fn documentCreateElement(doc: *Document, tag_name: []const u8) *Eleme
     return elem.?;
 }
 
+pub inline fn documentBody(doc: *Document) ?*Body {
+    const dochtml = @as(*DocumentHTML, @ptrCast(doc));
+    var body: ?*ElementHTML = undefined;
+    _ = documentHTMLVtable(dochtml).get_body.?(dochtml, &body);
+    if (body == null) {
+        return null;
+    }
+    return @as(*Body, @ptrCast(body.?));
+}
+
 // DocumentHTML
 pub const DocumentHTML = c.dom_html_document;