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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under both the MIT license found in the
 * LICENSE-MIT file in the root directory of this source tree and the Apache
 * License, Version 2.0 found in the LICENSE-APACHE file in the root directory
 * of this source tree.
 */

#![allow(elided_lifetimes_in_paths)]

#[allow(unused_extern_crates)]
extern crate proc_macro;

mod expand;

use proc_macro::TokenStream;
use syn::parse_macro_input;
use syn::punctuated::Punctuated;

use self::expand::expand;
use self::expand::Mode;

// Expand from:
//
//     #[fbinit::main]
//     fn main(fb: FacebookInit) {
//         ...
//     }
//
// to:
//
//     fn main() {
//         let fb: FacebookInit = fbinit::perform_init();
//         ...
//     }
//
// If async, also add a #[tokio::main] attribute.
//
// Accepts optional attribute argument disable_fatal_signals to disable adding
// handler to fatal signals in perform_init().
// Argument must be one of `default`, `none`, `all`, `sigterm_only`
// that represents the signal bit mask. For  example, the following disables SIGTERM:
//
//      #[fbinit::main(disable_fatal_signals = sigterm_only)
//
// - `default`: disables SIGTERM and SIGINT, and is also the default if `disable_fatal_signals`
//  is not specified
// - `none`: disabled no signals, overrides the default
// - `all`: disables ALL signals
// - `sigterm_only`: disabled SIGTERM
#[proc_macro_attribute]
pub fn main(args: TokenStream, input: TokenStream) -> TokenStream {
    expand(
        Mode::Main,
        parse_macro_input!(args with Punctuated::parse_terminated),
        parse_macro_input!(input),
    )
    .unwrap_or_else(|err| err.to_compile_error())
    .into()
}

// Same thing, expand:
//
//     #[fbinit::test]
//     fn name_of_test(fb: FacebookInit) {
//         ...
//     }
//
// to:
//
//     #[test]
//     fn name_of_test() {
//         let fb: FacebookInit = fbinit::perform_init();
//         ...
//     }
//
// with either #[test] or #[tokio::test] attribute.
//
// Accepts optional attribute argument disable_fatal_signals to disable adding
// handler to fatal signals in perform_init().
// Argument must be an int literal that represents the signal bit mask. For
// example, the following disables SIGTERM:
//
//      #[fbinit::main(disable_fatal_signals = 0x8000)
#[proc_macro_attribute]
pub fn test(args: TokenStream, input: TokenStream) -> TokenStream {
    expand(
        Mode::Test,
        parse_macro_input!(args with Punctuated::parse_terminated),
        parse_macro_input!(input),
    )
    .unwrap_or_else(|err| err.to_compile_error())
    .into()
}