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#![recursion_limit = "128"]
extern crate proc_macro;

use syn::parse_macro_input;

mod powerset_enum_impl;
mod powerset_macro_impl;

#[proc_macro]
pub fn powerset(args: proc_macro::TokenStream) -> proc_macro::TokenStream {
    match powerset_macro_impl::powerset_macro_impl(parse_macro_input!(args)) {
        Ok(output) => output.into(),
        Err(error) => error.to_compile_error().into(),
    }
}

/// Parametrize an `enum` to make it a powerset (set of all subsets), and create a macro with the
/// same name of the `enum` for easy notation of the subsets.
///
/// See [powerset_enum](../powerset_enum/index.html) for more info.
/// ```
#[proc_macro_attribute]
pub fn powerset_enum(
    _args: proc_macro::TokenStream,
    input: proc_macro::TokenStream,
) -> proc_macro::TokenStream {
    match powerset_enum_impl::powerset_enum_impl(parse_macro_input!(input)) {
        Ok(output) => output.into(),
        Err(error) => error.to_compile_error().into(),
    }
}