LibWeb: Implement Path2D class

Userland/Libraries/LibWeb/HTML/Path2D.cpp

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/HTML/Path2D.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/canvas.html#dom-path2d
+Path2D::Path2D(Optional<Variant<NonnullRefPtr<Path2D>, String>> const& path)
+{
+    // 1. Let output be a new Path2D object.
+    // 2. If path is not given, then return output.
+    if (!path.has_value())
+        return;
+
+    // 3. If path is a Path2D object, then add all subpaths of path to output and return output.
+    //    (In other words, it returns a copy of the argument.)
+    if (path->has<NonnullRefPtr<Path2D>>()) {
+        this->path() = path->get<NonnullRefPtr<Path2D>>()->path();
+        return;
+    }
+
+    dbgln("TODO: Implement constructing Path2D object with an SVG path string");
+
+    // FIXME: 4. Let svgPath be the result of parsing and interpreting path according to SVG 2's rules for path data. [SVG]
+    // FIXME: 5. Let (x, y) be the last point in svgPath.
+    // FIXME: 6. Add all the subpaths, if any, from svgPath to output.
+    // FIXME: 7. Create a new subpath in output with (x, y) as the only point in the subpath.
+    // FIXME: 8. Return output.
+}
+
+}