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//! Driver for proc macro server
use crate::ProcMacroSrv;
use proc_macro_api::msg::{self, Message};
use std::io;
pub fn run() -> io::Result<()> {
let mut srv = ProcMacroSrv::default();
while let Some(req) = read_request()? {
let res = match req {
msg::Request::ListMacro(task) => srv.list_macros(&task).map(msg::Response::ListMacro),
msg::Request::ExpansionMacro(task) => {
srv.expand(&task).map(msg::Response::ExpansionMacro)
}
};
let msg = res.unwrap_or_else(|err| {
msg::Response::Error(msg::ResponseError {
code: msg::ErrorCode::ExpansionError,
message: err,
})
});
if let Err(err) = write_response(msg) {
eprintln!("Write message error: {}", err);
}
}
Ok(())
}
fn read_request() -> io::Result<Option<msg::Request>> {
msg::Request::read(&mut io::stdin().lock())
}
fn write_response(msg: msg::Response) -> io::Result<()> {
msg.write(&mut io::stdout().lock())
}
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