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//! The CXX code generator for constructing and compiling C++ code.
//!
//! This is intended as a mechanism for embedding the `cxx` crate into
//! higher-level code generators. See [dtolnay/cxx#235] and
//! [https://github.com/google/autocxx].
//!
//! [dtolnay/cxx#235]: https://github.com/dtolnay/cxx/issues/235
//! [https://github.com/google/autocxx]: https://github.com/google/autocxx

#![allow(dead_code)]

mod gen;
mod syntax;

pub use crate::gen::{GeneratedCode, Opt};
use proc_macro2::TokenStream;
use std::error::Error as StdError;
use std::fmt::{self, Debug, Display};

pub struct Error(crate::gen::Error);

/// Generate C++ bindings code from a Rust token stream. This should be a Rust
/// token stream which somewhere contains a `#[cxx::bridge] mod {}`.
pub fn generate_header_and_cc(rust_source: TokenStream, opt: &Opt) -> Result<GeneratedCode, Error> {
    let syntax = syn::parse2(rust_source)
        .map_err(crate::gen::Error::from)
        .map_err(Error)?;
    gen::generate(syntax, opt).map_err(Error)
}

impl Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        Display::fmt(&self.0, f)
    }
}

impl Debug for Error {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        Debug::fmt(&self.0, f)
    }
}

impl StdError for Error {
    fn source(&self) -> Option<&(dyn StdError + 'static)> {
        self.0.source()
    }
}