use crate::*;

//#[cfg(feature = "dsl")]
//#[macro_export] macro_rules! try_delegate {
    //($s:ident, $dsl:expr, $T:ty) => {
        //let value: Option<$T> = Dsl::take_from($s, $dsl)?;
        //if let Some(value) = value {
            //return Ok(Some(value.boxed()))
        //}
    //}
//}

//// Provides components to the view.
//#[cfg(feature = "dsl")]
//pub trait ViewContext<'state, E: Output + 'state>:
    //Namespace<bool> + Namespace<usize> + Namespace<E::Unit> + Send + Sync
//{
    //fn get_content_sym <'source: 'state> (&'state self, iter: &mut TokenIter<'source>)
        //-> Perhaps<RenderBox<'state, E>>;
    //fn get_content_exp <'source: 'state> (&'state self, iter: &mut TokenIter<'source>)
        //-> Perhaps<RenderBox<'state, E>>
    //{
        //try_delegate!(self, iter, When::<RenderBox<'state, E>>);
        //try_delegate!(self, iter, Either::<RenderBox<'state, E>, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Align::<RenderBox<'state, E>>);
        //try_delegate!(self, iter, Bsp::<RenderBox<'state, E>, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Fill::<RenderBox<'state, E>>);
        //try_delegate!(self, iter, Fixed::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Min::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Max::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Shrink::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Expand::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Push::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Pull::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Margin::<_, RenderBox<'state, E>>);
        //try_delegate!(self, iter, Padding::<_, RenderBox<'state, E>>);
        //Ok(None)
    //}
//}

//#[cfg(feature = "dsl")]
//impl<'context, O: Output + 'context, T: ViewContext<'context, O>> Namespace<T> for RenderBox<'context, O> {
    //fn take_from <'state, 'source: 'state> (state: &'state T, token: &mut TokenIter<'source>)
        //-> Perhaps<RenderBox<'context, O>>
    //{
        //Ok(if let Some(content) = state.get_content_sym(token)? {
            //Some(content)
        //} else if let Some(content) = state.get_content_exp(token)? {
            //Some(content)
        //} else {
            //None
        //})
    //}
//}