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use graffiti::gfx::{GlBackend, RenderBackend};use graffiti::{App, Document, Viewport, Window};use std::cell::RefCell;use std::rc::Rc;
fn main() {    let app = unsafe { App::init() };    let mut win = Window::new(&app, "Hello", 1024, 768);    let mut viewport = Viewport::new(win.size(), &Rc::new(RefCell::new(Document::new())));    let mut backend = unsafe { GlBackend::new(|s| win.get_proc_address(s) as _) };
    let mut doc = viewport.document().borrow_mut();
    // super-simple prefix macro    macro_rules! html {        ($text:literal) => (doc.create_text_node($text));        ([ $tag:ident $(. $cls:ident)*: $($inner:tt)* ]) => ({            let el = doc.create_element(stringify!($tag));            doc.set_attribute(el, "class", stringify!($($cls)*));
            for (i, &child) in [ $(html!($inner)),* ].iter().enumerate() {                doc.insert_child(el, child, i)            }
            el        });    }
    let root = doc.root();    let div = html! (        [div.bar:            [h1: "Hello macro!"]            [p:                "xxx"                "yyy"                [strong: "zzz"]            ]        ]    );
    doc.insert_child(root, div, 0);    drop(doc);
    while !win.should_close() {        backend.render_frame(viewport.render());
        win.swap_buffers();        app.wait_events();    }}