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119 lines
3 KiB
Rust
119 lines
3 KiB
Rust
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
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use deno_core::anyhow::anyhow;
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use deno_core::error::AnyError;
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use deno_core::serde_json::Value;
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use std::cell::RefCell;
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use tokio::sync::mpsc::channel;
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use tokio::sync::mpsc::unbounded_channel;
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use tokio::sync::mpsc::Receiver;
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use tokio::sync::mpsc::Sender;
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use tokio::sync::mpsc::UnboundedReceiver;
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use tokio::sync::mpsc::UnboundedSender;
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use crate::lsp::ReplCompletionItem;
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/// Rustyline uses synchronous methods in its interfaces, but we need to call
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/// async methods. To get around this, we communicate with async code by using
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/// a channel and blocking on the result.
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pub fn rustyline_channel(
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) -> (RustylineSyncMessageSender, RustylineSyncMessageHandler) {
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let (message_tx, message_rx) = channel(1);
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let (response_tx, response_rx) = unbounded_channel();
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(
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RustylineSyncMessageSender {
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message_tx,
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response_rx: RefCell::new(response_rx),
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},
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RustylineSyncMessageHandler {
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response_tx,
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message_rx,
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},
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)
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}
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pub enum RustylineSyncMessage {
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PostMessage {
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method: String,
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params: Option<Value>,
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},
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LspCompletions {
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line_text: String,
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position: usize,
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},
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}
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pub enum RustylineSyncResponse {
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PostMessage(Result<Value, AnyError>),
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LspCompletions(Vec<ReplCompletionItem>),
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}
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pub struct RustylineSyncMessageSender {
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message_tx: Sender<RustylineSyncMessage>,
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response_rx: RefCell<UnboundedReceiver<RustylineSyncResponse>>,
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}
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impl RustylineSyncMessageSender {
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pub fn post_message(
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&self,
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method: &str,
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params: Option<Value>,
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) -> Result<Value, AnyError> {
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if let Err(err) =
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self
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.message_tx
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.blocking_send(RustylineSyncMessage::PostMessage {
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method: method.to_string(),
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params,
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})
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{
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Err(anyhow!("{}", err))
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} else {
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match self.response_rx.borrow_mut().blocking_recv().unwrap() {
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RustylineSyncResponse::PostMessage(result) => result,
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RustylineSyncResponse::LspCompletions(_) => unreachable!(),
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}
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}
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}
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pub fn lsp_completions(
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&self,
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line_text: &str,
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position: usize,
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) -> Vec<ReplCompletionItem> {
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if self
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.message_tx
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.blocking_send(RustylineSyncMessage::LspCompletions {
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line_text: line_text.to_string(),
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position,
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})
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.is_err()
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{
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Vec::new()
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} else {
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match self.response_rx.borrow_mut().blocking_recv().unwrap() {
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RustylineSyncResponse::LspCompletions(result) => result,
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RustylineSyncResponse::PostMessage(_) => unreachable!(),
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}
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}
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}
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}
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pub struct RustylineSyncMessageHandler {
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message_rx: Receiver<RustylineSyncMessage>,
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response_tx: UnboundedSender<RustylineSyncResponse>,
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}
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impl RustylineSyncMessageHandler {
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pub async fn recv(&mut self) -> Option<RustylineSyncMessage> {
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self.message_rx.recv().await
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}
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pub fn send(&self, response: RustylineSyncResponse) -> Result<(), AnyError> {
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self
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.response_tx
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.send(response)
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.map_err(|err| anyhow!("{}", err))
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}
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}
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