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#![recursion_limit = "256"]
#![allow(clippy::all)]
#![cfg_attr(rustfmt, rustfmt::skip)]
#![allow(nonstandard_style, unused_imports)]

use {
    ::core::{
        mem,
        ops::Not as _,
        slice,
    },
    ::proc_macro::{
        TokenStream,
    },
    ::proc_macro2::{
        Span,
        TokenStream as TokenStream2,
        TokenTree as TT,
    },
    ::quote::{
        format_ident,
        quote,
        quote_spanned,
        ToTokens,
    },
    ::syn::{*,
        parse::{
            Parse,
            Parser,
            ParseStream,
        },
        punctuated::Punctuated,
        spanned::Spanned,
        Result,
    },
    crate::utils::{
        *,
    },
};

#[allow(unused_macros)]
macro_rules! todo {(
    $( $fmt:expr $(, $($rest:tt)* )? )?
) => (
    ::core::todo! {
        concat!(file!(), ":", line!(), ":", column!(), " ({})"),
        ::core::format_args!(
            concat!($($fmt)?),
            $($( $($rest)* )?)?
        ),
    }
)}

#[macro_use]
extern crate macro_rules_attribute;

mod c_str;

#[path = "derives/_mod.rs"]
mod derives;

#[path = "ffi_export/_mod.rs"]
mod ffi_export;

#[path = "utils/_mod.rs"]
mod utils;

#[proc_macro_attribute] pub
fn cfg_headers (
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream
{
    parse_macro_input!(attrs as parse::Nothing);
    if cfg!(feature = "headers") {
        input
    } else {
        <_>::default()
    }
}

#[proc_macro] pub
fn c_str (input: TokenStream)
  -> TokenStream
{
    unwrap!(c_str::c_str(input.into()))
}

#[proc_macro_attribute] pub
fn ffi_export (attrs: TokenStream, input: TokenStream)
  -> TokenStream
{
    unwrap!(
        ffi_export::ffi_export(attrs.into(), input.into())
            .map(utils::mb_file_expanded)
    )
}

#[proc_macro_attribute] pub
fn derive_ReprC (
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream
{
    unwrap!(
        derives::derive_ReprC(attrs.into(), input.into())
            .map(utils::mb_file_expanded)
    )
}

// #[proc_macro_attribute] pub
// fn derive_CType (
//     attrs: TokenStream,
//     input: TokenStream,
// ) -> TokenStream
// {
//     unwrap!(derives::derive_CType(attrs.into(), input.into()))
// }

#[proc_macro_attribute] pub
fn derive_ReprC2 (
    attrs: TokenStream,
    input: TokenStream,
) -> TokenStream
{
    unwrap!(
        derives::repr_c::derive(attrs.into(), input.into())
            .map(utils::mb_file_expanded)
    )
}

#[doc(hidden)] /** Not part of the public API */ #[proc_macro] pub
fn __respan (
    input: TokenStream,
) -> TokenStream
{
    let parser = |input: ParseStream<'_>| Result::Ok({
        let mut contents;
        ({
            parenthesized!(contents in input);
            let tt: ::proc_macro2::TokenTree = contents.parse()?;
            let _: TokenStream2 = contents.parse()?;
            tt.span()
        }, {
            parenthesized!(contents in input);
            contents.parse::<TokenStream2>()?
        })
    });
    let (span, tts) = parse_macro_input!(input with parser);
    respan(span, tts.into()).into()
}

// where:
fn respan (
    span: Span,
    tts: TokenStream2,
) -> TokenStream2
{
    use ::proc_macro2::{*, TokenStream as TokenStream2};
    tts.into_iter().map(|mut tt| {
        if let TokenTree::Group(ref mut g) = tt {
            let g_span = g.span();
            *g = Group::new(
                g.delimiter(),
                respan(span, g.stream()),
            );
            g.set_span(/* span.located_at */ g_span)
        } else {
            tt.set_span(
                span //.located_at(tt.span())
            );
        }
        tt
    }).collect()
}