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//! [<img alt="github" src="https://img.shields.io/badge/github-udoprog/musli?style=for-the-badge&logo=github" height="20">](https://github.com/udoprog/musli)
//! [<img alt="crates.io" src="https://img.shields.io/crates/v/musli.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/musli)
//! [<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-musli?style=for-the-badge&logoColor=white&logo=data:image/svg+xml;base64,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" height="20">](https://docs.rs/musli)
//! [<img alt="build status" src="https://img.shields.io/github/workflow/status/udoprog/musli/CI/main?style=for-the-badge" height="20">](https://github.com/udoprog/musli/actions?query=branch%3Amain)
//!
//! This crate provides the macros used in [Müsli].
//!
//! Please refer to <https://docs.rs/musli> for documentation.
//!
//! [Müsli]: <https://docs.rs/musli>

use proc_macro::TokenStream;

mod expander;
mod internals;

/// Please refer to the main [musli documentation](https://docs.rs/musli).
#[proc_macro_derive(Encode, attributes(musli))]
pub fn derive_encode(input: TokenStream) -> TokenStream {
    let input = syn::parse_macro_input!(input as syn::DeriveInput);
    let expander = expander::Expander::new(&input, &quote::quote!(::musli));

    let dump = std::env::var("MUSLI_DUMP").ok();

    match expander.expand_encode() {
        Some(tokens) => {
            if let Some(dump) = dump {
                if expander.input.ident.to_string().contains(&dump) {
                    println!("{}", tokens);
                }
            }

            tokens.into()
        }
        None => to_compile_errors(expander.into_errors()).into(),
    }
}

/// Please refer to the main [musli documentation](https://docs.rs/musli).
#[proc_macro_derive(Decode, attributes(musli))]
pub fn derive_decode(input: TokenStream) -> TokenStream {
    let input = syn::parse_macro_input!(input as syn::DeriveInput);
    let expander = expander::Expander::new(&input, &quote::quote!(::musli));

    let dump = std::env::var("MUSLI_DUMP").ok();

    match expander.expand_decode() {
        Some(tokens) => {
            if let Some(dump) = dump {
                if expander.input.ident.to_string().contains(&dump) {
                    println!("{}", tokens);
                }
            }

            tokens.into()
        }
        None => to_compile_errors(expander.into_errors()).into(),
    }
}

fn to_compile_errors(errors: Vec<syn::Error>) -> proc_macro2::TokenStream {
    let mut output = proc_macro2::TokenStream::new();

    for e in errors {
        output.extend(e.to_compile_error());
    }

    output
}