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#![recursion_limit = "128"]
#![doc(html_logo_url = "https://raw.githubusercontent.com/RustPython/RustPython/master/logo.png")]
#![doc(html_root_url = "https://docs.rs/rustpython-derive/")]

extern crate proc_macro;

#[macro_use]
extern crate maplit;

#[macro_use]
mod error;
mod compile_bytecode;
mod from_args;
mod pyclass;
mod util;

use error::{extract_spans, Diagnostic};
use proc_macro::TokenStream;
use proc_macro2::TokenStream as TokenStream2;
use quote::ToTokens;
use syn::{parse_macro_input, AttributeArgs, DeriveInput, Item};

fn result_to_tokens(result: Result<TokenStream2, Diagnostic>) -> TokenStream {
    result.unwrap_or_else(ToTokens::into_token_stream).into()
}

#[proc_macro_derive(FromArgs, attributes(pyarg))]
pub fn derive_from_args(input: TokenStream) -> TokenStream {
    let input = parse_macro_input!(input as DeriveInput);
    result_to_tokens(from_args::impl_from_args(input))
}

#[proc_macro_attribute]
pub fn pyclass(attr: TokenStream, item: TokenStream) -> TokenStream {
    let attr = parse_macro_input!(attr as AttributeArgs);
    let item = parse_macro_input!(item as Item);
    result_to_tokens(pyclass::impl_pyclass(attr, item))
}

#[proc_macro_attribute]
pub fn pyimpl(attr: TokenStream, item: TokenStream) -> TokenStream {
    let attr = parse_macro_input!(attr as AttributeArgs);
    let item = parse_macro_input!(item as Item);
    result_to_tokens(pyclass::impl_pyimpl(attr, item))
}

#[proc_macro_attribute]
pub fn pystruct_sequence(attr: TokenStream, item: TokenStream) -> TokenStream {
    let attr = parse_macro_input!(attr as AttributeArgs);
    let item = parse_macro_input!(item as Item);
    result_to_tokens(pyclass::impl_pystruct_sequence(attr, item))
}

fn result_to_tokens_expr(result: Result<TokenStream2, Diagnostic>) -> TokenStream {
    let tokens2 = result.unwrap_or_else(ToTokens::into_token_stream);
    let ret = quote::quote! {
        macro_rules! __proc_macro_call {
            () => {{ #tokens2 }}
        }
    };
    ret.into()
}

#[proc_macro]
pub fn py_compile_bytecode(input: TokenStream) -> TokenStream {
    result_to_tokens_expr(compile_bytecode::impl_py_compile_bytecode(input.into()))
}