fn parse(input: ParseStream) -> Result<Self> {

        let content;

        parenthesized!(content in input);

        let rule_set: LitStr = content.parse()?;

        let _: Comma = content.parse()?;

        let priority: LitInt = content.parse()?;

        Ok(RuleSetAndPriority { rule_set, priority })

    }

    fn parse(input: ParseStream) -> Result<Self> {

        let rule_sets = Punctuated::<RuleSetAndPriority, Comma>::parse_terminated(input)?;

        Ok(RegisterRuleArgs {

            rule_sets: rule_sets.into_iter().collect(),

        })

    }

pub fn register_rule(arg_tokens: TokenStream, item: TokenStream) -> TokenStream {

    let func = parse_macro_input!(item as ItemFn);

    let rule_ident = &func.sig.ident;

    let static_name = format!("CONJURE_GEN_RULE_{}", rule_ident).to_uppercase();

    let static_ident = Ident::new(&static_name, rule_ident.span());

    let args = parse_macro_input!(arg_tokens as RegisterRuleArgs);

    let rule_sets = args

        .rule_sets

        .iter()

        .map(|rule_set| {

            let rule_set_name = &rule_set.rule_set;

            let priority = &rule_set.priority;

            quote! {

                (#rule_set_name, #priority as u8)

            }

        })

        .collect::<Vec<_>>();

    let expanded = quote! {

        #func

        use ::conjure_core::rule_engine::_dependencies::*; // ToDo idk if we need to explicitly do that?

        #[::conjure_core::rule_engine::_dependencies::distributed_slice(::conjure_core::rule_engine::RULES_DISTRIBUTED_SLICE)]

        pub static #static_ident: ::conjure_core::rule_engine::Rule<'static> = ::conjure_core::rule_engine::Rule {

            name: stringify!(#rule_ident),

            application: #rule_ident,

            rule_sets: &[#(#rule_sets),*],

        };

    };

    TokenStream::from(expanded)

}

fn parse_parenthesized<T: Parse>(input: ParseStream) -> Result<Vec<T>> {

    let content;

    parenthesized!(content in input);

    let mut paths = Vec::new();

    while !content.is_empty() {

        let path = content.parse()?;

        paths.push(path);

        if content.is_empty() {

            break;

    Ok(paths)

}

    fn parse(input: ParseStream) -> Result<Self> {

        let name = input.parse()?;

        input.parse::<Comma>()?;

        let priority = input.parse()?;

        if input.is_empty() {

        }

        input.parse::<Comma>()?;

        let dependencies = parse_parenthesized::<LitStr>(input)?;

        if input.is_empty() {

            return Ok(Self {

                name,

                priority,

                dependencies,

                solver_families: Vec::new(),

            });

        }

        input.parse::<Comma>()?;

        let solver_families = parse_parenthesized::<Path>(input)?;

        Ok(Self {

            name,

            priority,

            dependencies,

            solver_families,

        })

    }

pub fn register_rule_set(args: TokenStream) -> TokenStream {

        name,

        priority,

        dependencies,

        solver_families,

    } = parse_macro_input!(args as RuleSetArgs);

    let static_name = format!("CONJURE_GEN_RULE_SET_{}", name.value()).to_uppercase();

    let static_ident = Ident::new(&static_name, Span::call_site());

    let dependencies = quote! {

        #(#dependencies),*

    };

    let solver_families = quote! {

        #(#solver_families),*

    };

    let expanded = quote! {

        use ::conjure_core::rule_engine::_dependencies::*; // ToDo idk if we need to explicitly do that?

        #[::conjure_core::rule_engine::_dependencies::distributed_slice(::conjure_core::rule_engine::RULE_SETS_DISTRIBUTED_SLICE)]

        pub static #static_ident: ::conjure_core::rule_engine::RuleSet<'static> = ::conjure_core::rule_engine::RuleSet::new(#name, #priority, &[#dependencies], &[#solver_families]);

    };

    TokenStream::from(expanded)

}