fichu 0.1.16

A formatter for SPARQL queries
Documentation 
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mod server;

use log::error;
use server::Server;
use wasm_bindgen::prelude::*;
use wasm_bindgen_futures::JsFuture;
use web_sys::js_sys;

async fn read_message(
    reader: &web_sys::ReadableStreamDefaultReader,
) -> Result<(String, bool), String> {
    match JsFuture::from(reader.read()).await {
        Ok(js_object) => {
            let value = js_sys::Reflect::get(&js_object, &"value".into())
                .map_err(|_| "\"value\" property not present in message")?
                .as_string()
                .ok_or("\"value\" is not a string")?;
            let done = js_sys::Reflect::get(&js_object, &"done".into())
                .map_err(|_| "\"done\" property not present in message")?
                .as_bool()
                .ok_or("\"done\" is not a boolean")?;
            Ok((value, done))
        }
        Err(_) => Err("Error while reading from input-stream".to_string()),
    }
}

fn send_message(writer: &web_sys::WritableStreamDefaultWriter, message: String) {
    let _future = JsFuture::from(writer.write_with_chunk(&message.into()));
}

#[wasm_bindgen]
pub async fn start_language_server(
    reader: web_sys::ReadableStreamDefaultReader,
    writer: web_sys::WritableStreamDefaultWriter,
) {
    #[cfg(target_arch = "wasm32")]
    wasm_logger::init(wasm_logger::Config::default());
    let mut server = Server::new(move |message| send_message(&writer, message));
    loop {
        match read_message(&reader).await {
            Ok((value, done)) => {
                server.handle_message(value);
                if done {
                    break;
                }
            }
            Err(e) => error!("{}", e),
        }
    }
}