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repl.rs
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repl.rs
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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
use crate::global_state::GlobalState;
use crate::inspector::InspectorSession;
use crate::worker::MainWorker;
use crate::worker::Worker;
use deno_core::error::AnyError;
use deno_core::serde_json::json;
use deno_core::serde_json::Value;
use rustyline::error::ReadlineError;
use rustyline::validate::MatchingBracketValidator;
use rustyline::validate::ValidationContext;
use rustyline::validate::ValidationResult;
use rustyline::validate::Validator;
use rustyline::Editor;
use rustyline_derive::{Completer, Helper, Highlighter, Hinter};
use std::sync::Arc;
use std::sync::Mutex;
// Provides syntax specific helpers to the editor like validation for multi-line edits.
#[derive(Completer, Helper, Highlighter, Hinter)]
struct Helper {
validator: MatchingBracketValidator,
}
impl Validator for Helper {
fn validate(
&self,
ctx: &mut ValidationContext,
) -> Result<ValidationResult, ReadlineError> {
self.validator.validate(ctx)
}
}
async fn post_message_and_poll(
worker: &mut Worker,
session: &mut InspectorSession,
method: &str,
params: Option<Value>,
) -> Result<Value, AnyError> {
let response = session.post_message(method, params);
tokio::pin!(response);
loop {
tokio::select! {
result = &mut response => {
return result
}
_ = &mut *worker => {
// A zero delay is long enough to yield the thread in order to prevent the loop from
// running hot for messages that are taking longer to resolve like for example an
// evaluation of top level await.
tokio::time::delay_for(tokio::time::Duration::from_millis(0)).await;
}
}
}
}
async fn read_line_and_poll(
worker: &mut Worker,
editor: Arc<Mutex<Editor<Helper>>>,
) -> Result<String, ReadlineError> {
let mut line =
tokio::task::spawn_blocking(move || editor.lock().unwrap().readline("> "));
let mut poll_worker = true;
loop {
// Because an inspector websocket client may choose to connect at anytime when we have an
// inspector server we need to keep polling the worker to pick up new connections.
let mut timeout =
tokio::time::delay_for(tokio::time::Duration::from_millis(1000));
tokio::select! {
result = &mut line => {
return result.unwrap();
}
_ = &mut *worker, if poll_worker => {
poll_worker = false;
}
_ = &mut timeout => {
poll_worker = true
}
}
}
}
pub async fn run(
global_state: &GlobalState,
mut worker: MainWorker,
) -> Result<(), AnyError> {
// Our inspector is unable to default to the default context id so we have to specify it here.
let context_id: u32 = 1;
let inspector = worker
.inspector
.as_mut()
.expect("Inspector is not created.");
let mut session = InspectorSession::new(&mut **inspector);
let history_file = global_state.dir.root.join("deno_history.txt");
post_message_and_poll(&mut *worker, &mut session, "Runtime.enable", None)
.await?;
let helper = Helper {
validator: MatchingBracketValidator::new(),
};
let editor = Arc::new(Mutex::new(Editor::new()));
editor.lock().unwrap().set_helper(Some(helper));
editor
.lock()
.unwrap()
.load_history(history_file.to_str().unwrap())
.unwrap_or(());
println!("Deno {}", crate::version::DENO);
println!("exit using ctrl+d or close()");
let prelude = r#"
Object.defineProperty(globalThis, "_", {
configurable: true,
get: () => Deno[Deno.internal].lastEvalResult,
set: (value) => {
Object.defineProperty(globalThis, "_", {
value: value,
writable: true,
enumerable: true,
configurable: true,
});
console.log("Last evaluation result is no longer saved to _.");
},
});
Object.defineProperty(globalThis, "_error", {
configurable: true,
get: () => Deno[Deno.internal].lastThrownError,
set: (value) => {
Object.defineProperty(globalThis, "_error", {
value: value,
writable: true,
enumerable: true,
configurable: true,
});
console.log("Last thrown error is no longer saved to _error.");
},
});
"#;
post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.evaluate",
Some(json!({
"expression": prelude,
"contextId": context_id,
})),
)
.await?;
loop {
let line = read_line_and_poll(&mut *worker, editor.clone()).await;
match line {
Ok(line) => {
// It is a bit unexpected that { "foo": "bar" } is interpreted as a block
// statement rather than an object literal so we interpret it as an expression statement
// to match the behavior found in a typical prompt including browser developer tools.
let wrapped_line = if line.trim_start().starts_with('{')
&& !line.trim_end().ends_with(';')
{
format!("({})", &line)
} else {
line.clone()
};
let evaluate_response = post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.evaluate",
Some(json!({
"expression": format!("'use strict'; void 0;\n{}", &wrapped_line),
"contextId": context_id,
"replMode": true,
})),
)
.await?;
// If that fails, we retry it without wrapping in parens letting the error bubble up to the
// user if it is still an error.
let evaluate_response =
if evaluate_response.get("exceptionDetails").is_some()
&& wrapped_line != line
{
post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.evaluate",
Some(json!({
"expression": format!("'use strict'; void 0;\n{}", &line),
"contextId": context_id,
"replMode": true,
})),
)
.await?
} else {
evaluate_response
};
let is_closing = post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.evaluate",
Some(json!({
"expression": "(globalThis.closed)",
"contextId": context_id,
})),
)
.await?
.get("result")
.unwrap()
.get("value")
.unwrap()
.as_bool()
.unwrap();
if is_closing {
break;
}
let evaluate_result = evaluate_response.get("result").unwrap();
let evaluate_exception_details =
evaluate_response.get("exceptionDetails");
if evaluate_exception_details.is_some() {
post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.callFunctionOn",
Some(json!({
"executionContextId": context_id,
"functionDeclaration": "function (object) { Deno[Deno.internal].lastThrownError = object; }",
"arguments": [
evaluate_result,
],
})),
).await?;
} else {
post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.callFunctionOn",
Some(json!({
"executionContextId": context_id,
"functionDeclaration": "function (object) { Deno[Deno.internal].lastEvalResult = object; }",
"arguments": [
evaluate_result,
],
})),
).await?;
}
// TODO(caspervonb) we should investigate using previews here but to keep things
// consistent with the previous implementation we just get the preview result from
// Deno.inspectArgs.
let inspect_response =
post_message_and_poll(
&mut *worker,
&mut session,
"Runtime.callFunctionOn",
Some(json!({
"executionContextId": context_id,
"functionDeclaration": "function (object) { return Deno[Deno.internal].inspectArgs(['%o', object], { colors: true}); }",
"arguments": [
evaluate_result,
],
})),
).await?;
let inspect_result = inspect_response.get("result").unwrap();
match evaluate_exception_details {
Some(_) => eprintln!(
"Uncaught {}",
inspect_result.get("value").unwrap().as_str().unwrap()
),
None => println!(
"{}",
inspect_result.get("value").unwrap().as_str().unwrap()
),
}
editor.lock().unwrap().add_history_entry(line.as_str());
}
Err(ReadlineError::Interrupted) => {
break;
}
Err(ReadlineError::Eof) => {
break;
}
Err(err) => {
println!("Error: {:?}", err);
break;
}
}
}
std::fs::create_dir_all(history_file.parent().unwrap())?;
editor
.lock()
.unwrap()
.save_history(history_file.to_str().unwrap())?;
Ok(())
}