LibWeb/SVG: Implement SVGTransformList.length

Author: https://github.com/jamierocks
Commit: 4a1d02e7d8
Pull-request: https://github.com/SerenityOS/serenity/pull/24525

Userland/Libraries/LibWeb/SVG/SVGTransformList.cpp

@@ -23,6 +23,13 @@ SVGTransformList::~SVGTransformList() = default;
 SVGTransformList::SVGTransformList(JS::Realm& realm)
     : PlatformObject(realm) {};
 
+// https://svgwg.org/svg2-draft/single-page.html#types-__svg__SVGNameList__length
+WebIDL::UnsignedLong SVGTransformList::length()
+{
+    // The length and numberOfItems IDL attributes represents the length of the list, and on getting simply return the length of the list.
+    return m_transforms.size();
+}
+
 // https://svgwg.org/svg2-draft/single-page.html#types-__svg__SVGNameList__getItem
 WebIDL::ExceptionOr<JS::NonnullGCPtr<SVGTransform>> SVGTransformList::get_item(WebIDL::UnsignedLong index)
 {

Userland/Libraries/LibWeb/SVG/SVGTransformList.h

@@ -22,6 +22,8 @@ public:
     [[nodiscard]] static JS::NonnullGCPtr<SVGTransformList> create(JS::Realm& realm);
     virtual ~SVGTransformList() override;
 
+    WebIDL::UnsignedLong length();
+
     WebIDL::ExceptionOr<JS::NonnullGCPtr<SVGTransform>> get_item(WebIDL::UnsignedLong index);
 
     JS::NonnullGCPtr<SVGTransform> append_item(JS::NonnullGCPtr<SVGTransform> new_item);

Userland/Libraries/LibWeb/SVG/SVGTransformList.idl

@@ -3,7 +3,7 @@
 // https://svgwg.org/svg2-draft/single-page.html#coords-InterfaceSVGTransformList
 [Exposed=Window]
 interface SVGTransformList {
-  [FIXME] readonly attribute unsigned long length;
+  readonly attribute unsigned long length;
   [FIXME] readonly attribute unsigned long numberOfItems;
 
   [FIXME] undefined clear();