use crate::func::prelude::*;
use toddle::query::FontClass;

macro_rules! stylefunc {
    ($ident:ident) => {
        /// Styles text.
        #[derive(Debug, PartialEq)]
        pub struct $ident {
            body: Option<SyntaxTree>
        }

        function! {
            data: $ident,

            parse(args, body, ctx) {
                args.done()?;
                Ok($ident { body: parse!(optional: body, ctx) })
            }

            layout(this, ctx) {
                let mut new_style = ctx.style.clone();
                new_style.toggle_class(FontClass::$ident);

                Ok(match &this.body {
                    Some(body) => commands![
                        Command::SetStyle(new_style),
                        Command::Layout(body),
                        Command::SetStyle(ctx.style.clone()),
                    ],
                    None => commands![Command::SetStyle(new_style)]
                })
            }
        }
    };
}

stylefunc!(Italic);
stylefunc!(Bold);
stylefunc!(Monospace);