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-rw-r--r--cli/tools/repl/channel.rs74
-rw-r--r--cli/tools/repl/mod.rs792
2 files changed, 866 insertions, 0 deletions
diff --git a/cli/tools/repl/channel.rs b/cli/tools/repl/channel.rs
new file mode 100644
index 000000000..54ec6869d
--- /dev/null
+++ b/cli/tools/repl/channel.rs
@@ -0,0 +1,74 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
+use deno_core::anyhow::anyhow;
+use deno_core::error::AnyError;
+use deno_core::serde_json::Value;
+use std::cell::RefCell;
+use tokio::sync::mpsc::channel;
+use tokio::sync::mpsc::unbounded_channel;
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::mpsc::Sender;
+use tokio::sync::mpsc::UnboundedReceiver;
+use tokio::sync::mpsc::UnboundedSender;
+
+/// Rustyline uses synchronous methods in its interfaces, but we need to call
+/// async methods. To get around this, we communicate with async code by using
+/// a channel and blocking on the result.
+pub fn rustyline_channel(
+) -> (RustylineSyncMessageSender, RustylineSyncMessageHandler) {
+ let (message_tx, message_rx) = channel(1);
+ let (response_tx, response_rx) = unbounded_channel();
+
+ (
+ RustylineSyncMessageSender {
+ message_tx,
+ response_rx: RefCell::new(response_rx),
+ },
+ RustylineSyncMessageHandler {
+ response_tx,
+ message_rx,
+ },
+ )
+}
+
+pub type RustylineSyncMessage = (String, Option<Value>);
+pub type RustylineSyncResponse = Result<Value, AnyError>;
+
+pub struct RustylineSyncMessageSender {
+ message_tx: Sender<RustylineSyncMessage>,
+ response_rx: RefCell<UnboundedReceiver<RustylineSyncResponse>>,
+}
+
+impl RustylineSyncMessageSender {
+ pub fn post_message(
+ &self,
+ method: &str,
+ params: Option<Value>,
+ ) -> Result<Value, AnyError> {
+ if let Err(err) =
+ self.message_tx.blocking_send((method.to_string(), params))
+ {
+ Err(anyhow!("{}", err))
+ } else {
+ self.response_rx.borrow_mut().blocking_recv().unwrap()
+ }
+ }
+}
+
+pub struct RustylineSyncMessageHandler {
+ message_rx: Receiver<RustylineSyncMessage>,
+ response_tx: UnboundedSender<RustylineSyncResponse>,
+}
+
+impl RustylineSyncMessageHandler {
+ pub async fn recv(&mut self) -> Option<RustylineSyncMessage> {
+ self.message_rx.recv().await
+ }
+
+ pub fn send(&self, response: RustylineSyncResponse) -> Result<(), AnyError> {
+ self
+ .response_tx
+ .send(response)
+ .map_err(|err| anyhow!("{}", err))
+ }
+}
diff --git a/cli/tools/repl/mod.rs b/cli/tools/repl/mod.rs
new file mode 100644
index 000000000..925ede654
--- /dev/null
+++ b/cli/tools/repl/mod.rs
@@ -0,0 +1,792 @@
+// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
+
+use crate::ast::transpile;
+use crate::ast::ImportsNotUsedAsValues;
+use crate::colors;
+use crate::proc_state::ProcState;
+use deno_ast::swc::parser::error::SyntaxError;
+use deno_ast::swc::parser::token::Token;
+use deno_ast::swc::parser::token::Word;
+use deno_core::error::AnyError;
+use deno_core::futures::FutureExt;
+use deno_core::parking_lot::Mutex;
+use deno_core::serde_json::json;
+use deno_core::serde_json::Value;
+use deno_core::LocalInspectorSession;
+use deno_runtime::worker::MainWorker;
+use rustyline::completion::Completer;
+use rustyline::error::ReadlineError;
+use rustyline::highlight::Highlighter;
+use rustyline::validate::ValidationContext;
+use rustyline::validate::ValidationResult;
+use rustyline::validate::Validator;
+use rustyline::CompletionType;
+use rustyline::Config;
+use rustyline::Context;
+use rustyline::Editor;
+use rustyline_derive::{Helper, Hinter};
+use std::borrow::Cow;
+use std::path::PathBuf;
+use std::sync::Arc;
+
+mod channel;
+
+use channel::rustyline_channel;
+use channel::RustylineSyncMessageHandler;
+use channel::RustylineSyncMessageSender;
+
+// Provides helpers to the editor like validation for multi-line edits, completion candidates for
+// tab completion.
+#[derive(Helper, Hinter)]
+struct EditorHelper {
+ context_id: u64,
+ sync_sender: RustylineSyncMessageSender,
+}
+
+impl EditorHelper {
+ pub fn get_global_lexical_scope_names(&self) -> Vec<String> {
+ let evaluate_response = self
+ .sync_sender
+ .post_message(
+ "Runtime.globalLexicalScopeNames",
+ Some(json!({
+ "executionContextId": self.context_id,
+ })),
+ )
+ .unwrap();
+
+ evaluate_response
+ .get("names")
+ .unwrap()
+ .as_array()
+ .unwrap()
+ .iter()
+ .map(|n| n.as_str().unwrap().to_string())
+ .collect()
+ }
+
+ pub fn get_expression_property_names(&self, expr: &str) -> Vec<String> {
+ // try to get the properties from the expression
+ if let Some(properties) = self.get_object_expr_properties(expr) {
+ return properties;
+ }
+
+ // otherwise fall back to the prototype
+ let expr_type = self.get_expression_type(expr);
+ let object_expr = match expr_type.as_deref() {
+ // possibilities: https://chromedevtools.github.io/devtools-protocol/v8/Runtime/#type-RemoteObject
+ Some("object") => "Object.prototype",
+ Some("function") => "Function.prototype",
+ Some("string") => "String.prototype",
+ Some("boolean") => "Boolean.prototype",
+ Some("bigint") => "BigInt.prototype",
+ Some("number") => "Number.prototype",
+ _ => return Vec::new(), // undefined, symbol, and unhandled
+ };
+
+ self
+ .get_object_expr_properties(object_expr)
+ .unwrap_or_else(Vec::new)
+ }
+
+ fn get_expression_type(&self, expr: &str) -> Option<String> {
+ self
+ .evaluate_expression(expr)?
+ .get("result")?
+ .get("type")?
+ .as_str()
+ .map(|s| s.to_string())
+ }
+
+ fn get_object_expr_properties(
+ &self,
+ object_expr: &str,
+ ) -> Option<Vec<String>> {
+ let evaluate_result = self.evaluate_expression(object_expr)?;
+ let object_id = evaluate_result.get("result")?.get("objectId")?;
+
+ let get_properties_response = self
+ .sync_sender
+ .post_message(
+ "Runtime.getProperties",
+ Some(json!({
+ "objectId": object_id,
+ })),
+ )
+ .ok()?;
+
+ Some(
+ get_properties_response
+ .get("result")?
+ .as_array()
+ .unwrap()
+ .iter()
+ .map(|r| r.get("name").unwrap().as_str().unwrap().to_string())
+ .collect(),
+ )
+ }
+
+ fn evaluate_expression(&self, expr: &str) -> Option<Value> {
+ let evaluate_response = self
+ .sync_sender
+ .post_message(
+ "Runtime.evaluate",
+ Some(json!({
+ "contextId": self.context_id,
+ "expression": expr,
+ "throwOnSideEffect": true,
+ "timeout": 200,
+ })),
+ )
+ .ok()?;
+
+ if evaluate_response.get("exceptionDetails").is_some() {
+ None
+ } else {
+ Some(evaluate_response)
+ }
+ }
+}
+
+fn is_word_boundary(c: char) -> bool {
+ if c == '.' {
+ false
+ } else {
+ char::is_ascii_whitespace(&c) || char::is_ascii_punctuation(&c)
+ }
+}
+
+fn get_expr_from_line_at_pos(line: &str, cursor_pos: usize) -> &str {
+ let start = line[..cursor_pos]
+ .rfind(is_word_boundary)
+ .map_or_else(|| 0, |i| i);
+ let end = line[cursor_pos..]
+ .rfind(is_word_boundary)
+ .map_or_else(|| cursor_pos, |i| cursor_pos + i);
+
+ let word = &line[start..end];
+ let word = word.strip_prefix(is_word_boundary).unwrap_or(word);
+ let word = word.strip_suffix(is_word_boundary).unwrap_or(word);
+
+ word
+}
+
+impl Completer for EditorHelper {
+ type Candidate = String;
+
+ fn complete(
+ &self,
+ line: &str,
+ pos: usize,
+ _ctx: &Context<'_>,
+ ) -> Result<(usize, Vec<String>), ReadlineError> {
+ let expr = get_expr_from_line_at_pos(line, pos);
+
+ // check if the expression is in the form `obj.prop`
+ if let Some(index) = expr.rfind('.') {
+ let sub_expr = &expr[..index];
+ let prop_name = &expr[index + 1..];
+ let candidates = self
+ .get_expression_property_names(sub_expr)
+ .into_iter()
+ .filter(|n| !n.starts_with("Symbol(") && n.starts_with(prop_name))
+ .collect();
+
+ Ok((pos - prop_name.len(), candidates))
+ } else {
+ // combine results of declarations and globalThis properties
+ let mut candidates = self
+ .get_expression_property_names("globalThis")
+ .into_iter()
+ .chain(self.get_global_lexical_scope_names())
+ .filter(|n| n.starts_with(expr))
+ .collect::<Vec<_>>();
+
+ // sort and remove duplicates
+ candidates.sort();
+ candidates.dedup(); // make sure to sort first
+
+ Ok((pos - expr.len(), candidates))
+ }
+ }
+}
+
+impl Validator for EditorHelper {
+ fn validate(
+ &self,
+ ctx: &mut ValidationContext,
+ ) -> Result<ValidationResult, ReadlineError> {
+ let mut stack: Vec<Token> = Vec::new();
+ let mut in_template = false;
+
+ for item in deno_ast::lex(ctx.input(), deno_ast::MediaType::TypeScript) {
+ if let deno_ast::TokenOrComment::Token(token) = item.inner {
+ match token {
+ Token::BackQuote => in_template = !in_template,
+ Token::LParen
+ | Token::LBracket
+ | Token::LBrace
+ | Token::DollarLBrace => stack.push(token),
+ Token::RParen | Token::RBracket | Token::RBrace => {
+ match (stack.pop(), token) {
+ (Some(Token::LParen), Token::RParen)
+ | (Some(Token::LBracket), Token::RBracket)
+ | (Some(Token::LBrace), Token::RBrace)
+ | (Some(Token::DollarLBrace), Token::RBrace) => {}
+ (Some(left), _) => {
+ return Ok(ValidationResult::Invalid(Some(format!(
+ "Mismatched pairs: {:?} is not properly closed",
+ left
+ ))))
+ }
+ (None, _) => {
+ // While technically invalid when unpaired, it should be V8's task to output error instead.
+ // Thus marked as valid with no info.
+ return Ok(ValidationResult::Valid(None));
+ }
+ }
+ }
+ Token::Error(error) => {
+ match error.kind() {
+ // If there is unterminated template, it continues to read input.
+ SyntaxError::UnterminatedTpl => {}
+ _ => {
+ // If it failed parsing, it should be V8's task to output error instead.
+ // Thus marked as valid with no info.
+ return Ok(ValidationResult::Valid(None));
+ }
+ }
+ }
+ _ => {}
+ }
+ }
+ }
+
+ if !stack.is_empty() || in_template {
+ return Ok(ValidationResult::Incomplete);
+ }
+
+ Ok(ValidationResult::Valid(None))
+ }
+}
+
+impl Highlighter for EditorHelper {
+ fn highlight_hint<'h>(&self, hint: &'h str) -> Cow<'h, str> {
+ hint.into()
+ }
+
+ fn highlight_candidate<'c>(
+ &self,
+ candidate: &'c str,
+ completion: rustyline::CompletionType,
+ ) -> Cow<'c, str> {
+ if completion == CompletionType::List {
+ candidate.into()
+ } else {
+ self.highlight(candidate, 0)
+ }
+ }
+
+ fn highlight_char(&self, line: &str, _: usize) -> bool {
+ !line.is_empty()
+ }
+
+ fn highlight<'l>(&self, line: &'l str, _: usize) -> Cow<'l, str> {
+ let mut out_line = String::from(line);
+
+ for item in deno_ast::lex(line, deno_ast::MediaType::TypeScript) {
+ // Adding color adds more bytes to the string,
+ // so an offset is needed to stop spans falling out of sync.
+ let offset = out_line.len() - line.len();
+ let span = std::ops::Range {
+ start: item.span.lo.0 as usize,
+ end: item.span.hi.0 as usize,
+ };
+
+ out_line.replace_range(
+ span.start + offset..span.end + offset,
+ &match item.inner {
+ deno_ast::TokenOrComment::Token(token) => match token {
+ Token::Str { .. } | Token::Template { .. } | Token::BackQuote => {
+ colors::green(&line[span]).to_string()
+ }
+ Token::Regex(_, _) => colors::red(&line[span]).to_string(),
+ Token::Num(_) | Token::BigInt(_) => {
+ colors::yellow(&line[span]).to_string()
+ }
+ Token::Word(word) => match word {
+ Word::True | Word::False | Word::Null => {
+ colors::yellow(&line[span]).to_string()
+ }
+ Word::Keyword(_) => colors::cyan(&line[span]).to_string(),
+ Word::Ident(ident) => {
+ if ident == *"undefined" {
+ colors::gray(&line[span]).to_string()
+ } else if ident == *"Infinity" || ident == *"NaN" {
+ colors::yellow(&line[span]).to_string()
+ } else if ident == *"async" || ident == *"of" {
+ colors::cyan(&line[span]).to_string()
+ } else {
+ line[span].to_string()
+ }
+ }
+ },
+ _ => line[span].to_string(),
+ },
+ deno_ast::TokenOrComment::Comment { .. } => {
+ colors::gray(&line[span]).to_string()
+ }
+ },
+ );
+ }
+
+ out_line.into()
+ }
+}
+
+#[derive(Clone)]
+struct ReplEditor {
+ inner: Arc<Mutex<Editor<EditorHelper>>>,
+ history_file_path: PathBuf,
+}
+
+impl ReplEditor {
+ pub fn new(helper: EditorHelper, history_file_path: PathBuf) -> Self {
+ let editor_config = Config::builder()
+ .completion_type(CompletionType::List)
+ .build();
+
+ let mut editor = Editor::with_config(editor_config);
+ editor.set_helper(Some(helper));
+ editor.load_history(&history_file_path).unwrap_or(());
+
+ ReplEditor {
+ inner: Arc::new(Mutex::new(editor)),
+ history_file_path,
+ }
+ }
+
+ pub fn readline(&self) -> Result<String, ReadlineError> {
+ self.inner.lock().readline("> ")
+ }
+
+ pub fn add_history_entry(&self, entry: String) {
+ self.inner.lock().add_history_entry(entry);
+ }
+
+ pub fn save_history(&self) -> Result<(), AnyError> {
+ std::fs::create_dir_all(self.history_file_path.parent().unwrap())?;
+
+ self.inner.lock().save_history(&self.history_file_path)?;
+ Ok(())
+ }
+}
+
+static PRELUDE: &str = 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.");
+ },
+});
+"#;
+
+enum EvaluationOutput {
+ Value(String),
+ Error(String),
+}
+
+impl std::fmt::Display for EvaluationOutput {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ match self {
+ EvaluationOutput::Value(value) => f.write_str(value),
+ EvaluationOutput::Error(value) => f.write_str(value),
+ }
+ }
+}
+
+struct ReplSession {
+ worker: MainWorker,
+ session: LocalInspectorSession,
+ pub context_id: u64,
+}
+
+impl ReplSession {
+ pub async fn initialize(mut worker: MainWorker) -> Result<Self, AnyError> {
+ let mut session = worker.create_inspector_session().await;
+
+ worker
+ .with_event_loop(
+ session.post_message("Runtime.enable", None).boxed_local(),
+ )
+ .await?;
+
+ // Enabling the runtime domain will always send trigger one executionContextCreated for each
+ // context the inspector knows about so we grab the execution context from that since
+ // our inspector does not support a default context (0 is an invalid context id).
+ let mut context_id: u64 = 0;
+ for notification in session.notifications() {
+ let method = notification.get("method").unwrap().as_str().unwrap();
+ let params = notification.get("params").unwrap();
+
+ if method == "Runtime.executionContextCreated" {
+ context_id = params
+ .get("context")
+ .unwrap()
+ .get("id")
+ .unwrap()
+ .as_u64()
+ .unwrap();
+ }
+ }
+
+ let mut repl_session = ReplSession {
+ worker,
+ session,
+ context_id,
+ };
+
+ // inject prelude
+ repl_session.evaluate_expression(PRELUDE).await?;
+
+ Ok(repl_session)
+ }
+
+ pub async fn is_closing(&mut self) -> Result<bool, AnyError> {
+ let closed = self
+ .evaluate_expression("(this.closed)")
+ .await?
+ .get("result")
+ .unwrap()
+ .get("value")
+ .unwrap()
+ .as_bool()
+ .unwrap();
+
+ Ok(closed)
+ }
+
+ pub async fn post_message_with_event_loop(
+ &mut self,
+ method: &str,
+ params: Option<Value>,
+ ) -> Result<Value, AnyError> {
+ self
+ .worker
+ .with_event_loop(self.session.post_message(method, params).boxed_local())
+ .await
+ }
+
+ pub async fn run_event_loop(&mut self) -> Result<(), AnyError> {
+ self.worker.run_event_loop(true).await
+ }
+
+ pub async fn evaluate_line_and_get_output(
+ &mut self,
+ line: &str,
+ ) -> Result<EvaluationOutput, AnyError> {
+ match self.evaluate_line_with_object_wrapping(line).await {
+ Ok(evaluate_response) => {
+ let evaluate_result = evaluate_response.get("result").unwrap();
+ let evaluate_exception_details =
+ evaluate_response.get("exceptionDetails");
+
+ if evaluate_exception_details.is_some() {
+ self.set_last_thrown_error(evaluate_result).await?;
+ } else {
+ self.set_last_eval_result(evaluate_result).await?;
+ }
+
+ let value = self.get_eval_value(evaluate_result).await?;
+ Ok(match evaluate_exception_details {
+ Some(_) => EvaluationOutput::Error(format!("Uncaught {}", value)),
+ None => EvaluationOutput::Value(value),
+ })
+ }
+ Err(err) => {
+ // handle a parsing diagnostic
+ match err.downcast_ref::<deno_ast::Diagnostic>() {
+ Some(diagnostic) => Ok(EvaluationOutput::Error(format!(
+ "{}: {} at {}:{}",
+ colors::red("parse error"),
+ diagnostic.message(),
+ diagnostic.display_position.line_number,
+ diagnostic.display_position.column_number,
+ ))),
+ None => Err(err),
+ }
+ }
+ }
+ }
+
+ async fn evaluate_line_with_object_wrapping(
+ &mut self,
+ line: &str,
+ ) -> Result<Value, AnyError> {
+ // 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.to_string()
+ };
+
+ let evaluate_response = self.evaluate_ts_expression(&wrapped_line).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
+ {
+ self.evaluate_ts_expression(line).await?
+ } else {
+ evaluate_response
+ };
+
+ Ok(evaluate_response)
+ }
+
+ async fn set_last_thrown_error(
+ &mut self,
+ error: &Value,
+ ) -> Result<(), AnyError> {
+ self.post_message_with_event_loop(
+ "Runtime.callFunctionOn",
+ Some(json!({
+ "executionContextId": self.context_id,
+ "functionDeclaration": "function (object) { Deno[Deno.internal].lastThrownError = object; }",
+ "arguments": [
+ error,
+ ],
+ })),
+ ).await?;
+ Ok(())
+ }
+
+ async fn set_last_eval_result(
+ &mut self,
+ evaluate_result: &Value,
+ ) -> Result<(), AnyError> {
+ self.post_message_with_event_loop(
+ "Runtime.callFunctionOn",
+ Some(json!({
+ "executionContextId": self.context_id,
+ "functionDeclaration": "function (object) { Deno[Deno.internal].lastEvalResult = object; }",
+ "arguments": [
+ evaluate_result,
+ ],
+ })),
+ ).await?;
+ Ok(())
+ }
+
+ pub async fn get_eval_value(
+ &mut self,
+ evaluate_result: &Value,
+ ) -> Result<String, AnyError> {
+ // 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 = self.post_message_with_event_loop(
+ "Runtime.callFunctionOn",
+ Some(json!({
+ "executionContextId": self.context_id,
+ "functionDeclaration": r#"function (object) {
+ try {
+ return Deno[Deno.internal].inspectArgs(["%o", object], { colors: !Deno.noColor });
+ } catch (err) {
+ return Deno[Deno.internal].inspectArgs(["%o", err]);
+ }
+ }"#,
+ "arguments": [
+ evaluate_result,
+ ],
+ })),
+ ).await?;
+
+ let inspect_result = inspect_response.get("result").unwrap();
+ let value = inspect_result.get("value").unwrap().as_str().unwrap();
+
+ Ok(value.to_string())
+ }
+
+ async fn evaluate_ts_expression(
+ &mut self,
+ expression: &str,
+ ) -> Result<Value, AnyError> {
+ let parsed_module = deno_ast::parse_module(deno_ast::ParseParams {
+ specifier: "repl.ts".to_string(),
+ source: deno_ast::SourceTextInfo::from_string(expression.to_string()),
+ media_type: deno_ast::MediaType::TypeScript,
+ capture_tokens: false,
+ maybe_syntax: None,
+ scope_analysis: false,
+ })?;
+
+ let transpiled_src = transpile(
+ &parsed_module,
+ &crate::ast::EmitOptions {
+ emit_metadata: false,
+ source_map: false,
+ inline_source_map: false,
+ inline_sources: false,
+ imports_not_used_as_values: ImportsNotUsedAsValues::Preserve,
+ // JSX is not supported in the REPL
+ transform_jsx: false,
+ jsx_automatic: false,
+ jsx_development: false,
+ jsx_factory: "React.createElement".into(),
+ jsx_fragment_factory: "React.Fragment".into(),
+ jsx_import_source: None,
+ repl_imports: true,
+ },
+ )?
+ .0;
+
+ self
+ .evaluate_expression(&format!(
+ "'use strict'; void 0;\n{}",
+ transpiled_src
+ ))
+ .await
+ }
+
+ async fn evaluate_expression(
+ &mut self,
+ expression: &str,
+ ) -> Result<Value, AnyError> {
+ self
+ .post_message_with_event_loop(
+ "Runtime.evaluate",
+ Some(json!({
+ "expression": expression,
+ "contextId": self.context_id,
+ "replMode": true,
+ })),
+ )
+ .await
+ }
+}
+
+async fn read_line_and_poll(
+ repl_session: &mut ReplSession,
+ message_handler: &mut RustylineSyncMessageHandler,
+ editor: ReplEditor,
+) -> Result<String, ReadlineError> {
+ let mut line_fut = tokio::task::spawn_blocking(move || editor.readline());
+ let mut poll_worker = true;
+
+ loop {
+ tokio::select! {
+ result = &mut line_fut => {
+ return result.unwrap();
+ }
+ result = message_handler.recv() => {
+ if let Some((method, params)) = result {
+ let result = repl_session
+ .post_message_with_event_loop(&method, params)
+ .await;
+ message_handler.send(result).unwrap();
+ }
+
+ poll_worker = true;
+ },
+ _ = repl_session.run_event_loop(), if poll_worker => {
+ poll_worker = false;
+ }
+ }
+ }
+}
+
+pub async fn run(
+ ps: &ProcState,
+ worker: MainWorker,
+ maybe_eval: Option<String>,
+) -> Result<(), AnyError> {
+ let mut repl_session = ReplSession::initialize(worker).await?;
+ let mut rustyline_channel = rustyline_channel();
+
+ let helper = EditorHelper {
+ context_id: repl_session.context_id,
+ sync_sender: rustyline_channel.0,
+ };
+
+ let history_file_path = ps.dir.root.join("deno_history.txt");
+ let editor = ReplEditor::new(helper, history_file_path);
+
+ if let Some(eval) = maybe_eval {
+ let output = repl_session.evaluate_line_and_get_output(&eval).await?;
+ // only output errors
+ if let EvaluationOutput::Error(error_text) = output {
+ println!("error in --eval flag. {}", error_text);
+ }
+ }
+
+ println!("Deno {}", crate::version::deno());
+ println!("exit using ctrl+d or close()");
+
+ loop {
+ let line = read_line_and_poll(
+ &mut repl_session,
+ &mut rustyline_channel.1,
+ editor.clone(),
+ )
+ .await;
+ match line {
+ Ok(line) => {
+ let output = repl_session.evaluate_line_and_get_output(&line).await?;
+
+ // We check for close and break here instead of making it a loop condition to get
+ // consistent behavior in when the user evaluates a call to close().
+ if repl_session.is_closing().await? {
+ break;
+ }
+
+ println!("{}", output);
+
+ editor.add_history_entry(line);
+ }
+ Err(ReadlineError::Interrupted) => {
+ println!("exit using ctrl+d or close()");
+ continue;
+ }
+ Err(ReadlineError::Eof) => {
+ break;
+ }
+ Err(err) => {
+ println!("Error: {:?}", err);
+ break;
+ }
+ }
+ }
+
+ editor.save_history()?;
+
+ Ok(())
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-17 21:05:35 +0000