mirror of
https://github.com/denoland/deno.git
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793 lines
22 KiB
Rust
793 lines
22 KiB
Rust
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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use crate::ast;
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use crate::ast::Diagnostic;
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use crate::ast::ImportsNotUsedAsValues;
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use crate::ast::TokenOrComment;
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use crate::colors;
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use crate::media_type::MediaType;
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use crate::program_state::ProgramState;
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use deno_core::error::AnyError;
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use deno_core::futures::FutureExt;
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use deno_core::parking_lot::Mutex;
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use deno_core::serde_json::json;
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use deno_core::serde_json::Value;
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use deno_core::LocalInspectorSession;
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use deno_runtime::worker::MainWorker;
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use rustyline::completion::Completer;
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use rustyline::error::ReadlineError;
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use rustyline::highlight::Highlighter;
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use rustyline::validate::ValidationContext;
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use rustyline::validate::ValidationResult;
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use rustyline::validate::Validator;
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use rustyline::CompletionType;
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use rustyline::Config;
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use rustyline::Context;
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use rustyline::Editor;
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use rustyline_derive::{Helper, Hinter};
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use std::borrow::Cow;
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use std::cell::RefCell;
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use std::path::PathBuf;
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use std::sync::Arc;
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use swc_ecmascript::parser::error::SyntaxError;
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use swc_ecmascript::parser::token::{Token, Word};
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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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// Provides helpers to the editor like validation for multi-line edits, completion candidates for
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// tab completion.
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#[derive(Helper, Hinter)]
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struct EditorHelper {
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context_id: u64,
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message_tx: Sender<(String, Option<Value>)>,
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response_rx: RefCell<UnboundedReceiver<Result<Value, AnyError>>>,
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}
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impl EditorHelper {
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pub fn get_global_lexical_scope_names(&self) -> Vec<String> {
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let evaluate_response = self
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.post_message(
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"Runtime.globalLexicalScopeNames",
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Some(json!({
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"executionContextId": self.context_id,
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})),
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)
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.unwrap();
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evaluate_response
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.get("names")
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.unwrap()
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.as_array()
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.unwrap()
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.iter()
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.map(|n| n.as_str().unwrap().to_string())
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.collect()
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}
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pub fn get_expression_property_names(&self, expr: &str) -> Vec<String> {
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// try to get the properties from the expression
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if let Some(properties) = self.get_object_expr_properties(expr) {
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return properties;
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}
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// otherwise fall back to the prototype
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let expr_type = self.get_expression_type(expr);
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let object_expr = match expr_type.as_deref() {
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// possibilities: https://chromedevtools.github.io/devtools-protocol/v8/Runtime/#type-RemoteObject
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Some("object") => "Object.prototype",
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Some("function") => "Function.prototype",
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Some("string") => "String.prototype",
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Some("boolean") => "Boolean.prototype",
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Some("bigint") => "BigInt.prototype",
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Some("number") => "Number.prototype",
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_ => return Vec::new(), // undefined, symbol, and unhandled
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};
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self
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.get_object_expr_properties(object_expr)
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.unwrap_or_else(Vec::new)
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}
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fn get_expression_type(&self, expr: &str) -> Option<String> {
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self
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.evaluate_expression(expr)?
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.get("result")?
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.get("type")?
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.as_str()
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.map(|s| s.to_string())
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}
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fn get_object_expr_properties(
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&self,
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object_expr: &str,
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) -> Option<Vec<String>> {
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let evaluate_result = self.evaluate_expression(object_expr)?;
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let object_id = evaluate_result.get("result")?.get("objectId")?;
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let get_properties_response = self
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.post_message(
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"Runtime.getProperties",
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Some(json!({
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"objectId": object_id,
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})),
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)
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.ok()?;
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Some(
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get_properties_response
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.get("result")?
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.as_array()
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.unwrap()
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.iter()
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.map(|r| r.get("name").unwrap().as_str().unwrap().to_string())
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.collect(),
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)
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}
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fn evaluate_expression(&self, expr: &str) -> Option<Value> {
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let evaluate_response = self
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.post_message(
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"Runtime.evaluate",
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Some(json!({
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"contextId": self.context_id,
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"expression": expr,
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"throwOnSideEffect": true,
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"timeout": 200,
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})),
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)
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.ok()?;
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if evaluate_response.get("exceptionDetails").is_some() {
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None
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} else {
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Some(evaluate_response)
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}
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}
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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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self
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.message_tx
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.blocking_send((method.to_string(), params))?;
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self.response_rx.borrow_mut().blocking_recv().unwrap()
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}
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}
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fn is_word_boundary(c: char) -> bool {
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if c == '.' {
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false
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} else {
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char::is_ascii_whitespace(&c) || char::is_ascii_punctuation(&c)
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}
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}
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fn get_expr_from_line_at_pos(line: &str, cursor_pos: usize) -> &str {
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let start = line[..cursor_pos]
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.rfind(is_word_boundary)
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.map_or_else(|| 0, |i| i);
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let end = line[cursor_pos..]
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.rfind(is_word_boundary)
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.map_or_else(|| cursor_pos, |i| cursor_pos + i);
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let word = &line[start..end];
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let word = word.strip_prefix(is_word_boundary).unwrap_or(word);
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let word = word.strip_suffix(is_word_boundary).unwrap_or(word);
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word
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}
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impl Completer for EditorHelper {
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type Candidate = String;
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fn complete(
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&self,
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line: &str,
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pos: usize,
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_ctx: &Context<'_>,
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) -> Result<(usize, Vec<String>), ReadlineError> {
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let expr = get_expr_from_line_at_pos(line, pos);
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// check if the expression is in the form `obj.prop`
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if let Some(index) = expr.rfind('.') {
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let sub_expr = &expr[..index];
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let prop_name = &expr[index + 1..];
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let candidates = self
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.get_expression_property_names(sub_expr)
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.into_iter()
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.filter(|n| !n.starts_with("Symbol(") && n.starts_with(prop_name))
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.collect();
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Ok((pos - prop_name.len(), candidates))
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} else {
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// combine results of declarations and globalThis properties
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let mut candidates = self
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.get_expression_property_names("globalThis")
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.into_iter()
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.chain(self.get_global_lexical_scope_names())
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.filter(|n| n.starts_with(expr))
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.collect::<Vec<_>>();
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// sort and remove duplicates
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candidates.sort();
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candidates.dedup(); // make sure to sort first
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Ok((pos - expr.len(), candidates))
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}
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}
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}
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impl Validator for EditorHelper {
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fn validate(
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&self,
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ctx: &mut ValidationContext,
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) -> Result<ValidationResult, ReadlineError> {
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let mut stack: Vec<Token> = Vec::new();
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let mut in_template = false;
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for item in ast::lex(ctx.input(), &MediaType::TypeScript) {
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if let TokenOrComment::Token(token) = item.inner {
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match token {
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Token::BackQuote => in_template = !in_template,
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Token::LParen
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| Token::LBracket
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| Token::LBrace
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| Token::DollarLBrace => stack.push(token),
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Token::RParen | Token::RBracket | Token::RBrace => {
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match (stack.pop(), token) {
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(Some(Token::LParen), Token::RParen)
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| (Some(Token::LBracket), Token::RBracket)
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| (Some(Token::LBrace), Token::RBrace)
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| (Some(Token::DollarLBrace), Token::RBrace) => {}
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(Some(left), _) => {
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return Ok(ValidationResult::Invalid(Some(format!(
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"Mismatched pairs: {:?} is not properly closed",
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left
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))))
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}
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(None, _) => {
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// While technically invalid when unpaired, it should be V8's task to output error instead.
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// Thus marked as valid with no info.
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return Ok(ValidationResult::Valid(None));
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}
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}
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}
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Token::Error(error) => {
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match error.kind() {
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// If there is unterminated template, it continues to read input.
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SyntaxError::UnterminatedTpl => {}
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_ => {
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// If it failed parsing, it should be V8's task to output error instead.
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// Thus marked as valid with no info.
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return Ok(ValidationResult::Valid(None));
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}
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}
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}
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_ => {}
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}
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}
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}
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if !stack.is_empty() || in_template {
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return Ok(ValidationResult::Incomplete);
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}
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Ok(ValidationResult::Valid(None))
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}
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}
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impl Highlighter for EditorHelper {
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fn highlight_hint<'h>(&self, hint: &'h str) -> Cow<'h, str> {
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hint.into()
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}
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fn highlight_candidate<'c>(
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&self,
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candidate: &'c str,
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completion: rustyline::CompletionType,
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) -> Cow<'c, str> {
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if completion == CompletionType::List {
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candidate.into()
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} else {
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self.highlight(candidate, 0)
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}
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}
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fn highlight_char(&self, line: &str, _: usize) -> bool {
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!line.is_empty()
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}
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fn highlight<'l>(&self, line: &'l str, _: usize) -> Cow<'l, str> {
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let mut out_line = String::from(line);
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for item in ast::lex(line, &MediaType::TypeScript) {
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// Adding color adds more bytes to the string,
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// so an offset is needed to stop spans falling out of sync.
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let offset = out_line.len() - line.len();
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let span = item.span_as_range();
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out_line.replace_range(
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span.start + offset..span.end + offset,
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&match item.inner {
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TokenOrComment::Token(token) => match token {
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Token::Str { .. } | Token::Template { .. } | Token::BackQuote => {
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colors::green(&line[span]).to_string()
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}
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Token::Regex(_, _) => colors::red(&line[span]).to_string(),
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Token::Num(_) | Token::BigInt(_) => {
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colors::yellow(&line[span]).to_string()
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}
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Token::Word(word) => match word {
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Word::True | Word::False | Word::Null => {
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colors::yellow(&line[span]).to_string()
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}
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Word::Keyword(_) => colors::cyan(&line[span]).to_string(),
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Word::Ident(ident) => {
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if ident == *"undefined" {
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colors::gray(&line[span]).to_string()
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} else if ident == *"Infinity" || ident == *"NaN" {
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colors::yellow(&line[span]).to_string()
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} else if ident == *"async" || ident == *"of" {
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colors::cyan(&line[span]).to_string()
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} else {
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line[span].to_string()
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}
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}
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},
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_ => line[span].to_string(),
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},
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TokenOrComment::Comment { .. } => {
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colors::gray(&line[span]).to_string()
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}
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},
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);
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}
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out_line.into()
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}
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}
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#[derive(Clone)]
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struct ReplEditor {
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inner: Arc<Mutex<Editor<EditorHelper>>>,
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history_file_path: PathBuf,
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}
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impl ReplEditor {
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pub fn new(helper: EditorHelper, history_file_path: PathBuf) -> Self {
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let editor_config = Config::builder()
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.completion_type(CompletionType::List)
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.build();
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let mut editor = Editor::with_config(editor_config);
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editor.set_helper(Some(helper));
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editor.load_history(&history_file_path).unwrap_or(());
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ReplEditor {
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inner: Arc::new(Mutex::new(editor)),
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history_file_path,
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}
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}
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pub fn readline(&self) -> Result<String, ReadlineError> {
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self.inner.lock().readline("> ")
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}
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pub fn add_history_entry(&self, entry: String) {
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self.inner.lock().add_history_entry(entry);
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}
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pub fn save_history(&self) -> Result<(), AnyError> {
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std::fs::create_dir_all(self.history_file_path.parent().unwrap())?;
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self.inner.lock().save_history(&self.history_file_path)?;
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Ok(())
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}
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}
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static PRELUDE: &str = r#"
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Object.defineProperty(globalThis, "_", {
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configurable: true,
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get: () => Deno[Deno.internal].lastEvalResult,
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set: (value) => {
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Object.defineProperty(globalThis, "_", {
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value: value,
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writable: true,
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enumerable: true,
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configurable: true,
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});
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console.log("Last evaluation result is no longer saved to _.");
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},
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});
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Object.defineProperty(globalThis, "_error", {
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configurable: true,
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get: () => Deno[Deno.internal].lastThrownError,
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set: (value) => {
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Object.defineProperty(globalThis, "_error", {
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value: value,
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writable: true,
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enumerable: true,
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configurable: true,
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});
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console.log("Last thrown error is no longer saved to _error.");
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},
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});
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"#;
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enum EvaluationOutput {
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Value(String),
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Error(String),
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}
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impl std::fmt::Display for EvaluationOutput {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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match self {
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EvaluationOutput::Value(value) => f.write_str(value),
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EvaluationOutput::Error(value) => f.write_str(value),
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}
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}
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}
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struct ReplSession {
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worker: MainWorker,
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session: LocalInspectorSession,
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pub context_id: u64,
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}
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impl ReplSession {
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pub async fn initialize(mut worker: MainWorker) -> Result<Self, AnyError> {
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let mut session = worker.create_inspector_session().await;
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worker
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.with_event_loop(
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session.post_message("Runtime.enable", None).boxed_local(),
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)
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.await?;
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// Enabling the runtime domain will always send trigger one executionContextCreated for each
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// context the inspector knows about so we grab the execution context from that since
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// our inspector does not support a default context (0 is an invalid context id).
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let mut context_id: u64 = 0;
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for notification in session.notifications() {
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let method = notification.get("method").unwrap().as_str().unwrap();
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let params = notification.get("params").unwrap();
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if method == "Runtime.executionContextCreated" {
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context_id = params
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.get("context")
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.unwrap()
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.get("id")
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.unwrap()
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.as_u64()
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.unwrap();
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}
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}
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let mut repl_session = ReplSession {
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worker,
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session,
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context_id,
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};
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// inject prelude
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repl_session.evaluate_expression(PRELUDE).await?;
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Ok(repl_session)
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}
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pub async fn is_closing(&mut self) -> Result<bool, AnyError> {
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let closed = self
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.evaluate_expression("(globalThis.closed)")
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.await?
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.get("result")
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.unwrap()
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.get("value")
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.unwrap()
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.as_bool()
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.unwrap();
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Ok(closed)
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}
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pub async fn post_message_with_event_loop(
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&mut 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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self
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.worker
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.with_event_loop(self.session.post_message(method, params).boxed_local())
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.await
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}
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pub async fn run_event_loop(&mut self) -> Result<(), AnyError> {
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self.worker.run_event_loop(true).await
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}
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pub async fn evaluate_line_and_get_output(
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&mut self,
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line: &str,
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) -> Result<EvaluationOutput, AnyError> {
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match self.evaluate_line_with_object_wrapping(line).await {
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Ok(evaluate_response) => {
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let evaluate_result = evaluate_response.get("result").unwrap();
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let evaluate_exception_details =
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evaluate_response.get("exceptionDetails");
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if evaluate_exception_details.is_some() {
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self.set_last_thrown_error(evaluate_result).await?;
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} else {
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self.set_last_eval_result(evaluate_result).await?;
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}
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let value = self.get_eval_value(evaluate_result).await?;
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Ok(match evaluate_exception_details {
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Some(_) => EvaluationOutput::Error(format!("Uncaught {}", value)),
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None => EvaluationOutput::Value(value),
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})
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}
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Err(err) => {
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// handle a parsing diagnostic
|
|
match err.downcast_ref::<Diagnostic>() {
|
|
Some(diagnostic) => Ok(EvaluationOutput::Error(format!(
|
|
"{}: {} at {}:{}",
|
|
colors::red("parse error"),
|
|
diagnostic.message,
|
|
diagnostic.location.line,
|
|
diagnostic.location.col
|
|
))),
|
|
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 =
|
|
crate::ast::parse("repl.ts", expression, &crate::MediaType::TypeScript)?;
|
|
|
|
let transpiled_src = parsed_module
|
|
.transpile(&crate::ast::EmitOptions {
|
|
emit_metadata: false,
|
|
source_map: false,
|
|
inline_source_map: false,
|
|
imports_not_used_as_values: ImportsNotUsedAsValues::Preserve,
|
|
// JSX is not supported in the REPL
|
|
transform_jsx: false,
|
|
jsx_factory: "React.createElement".into(),
|
|
jsx_fragment_factory: "React.Fragment".into(),
|
|
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_rx: &mut Receiver<(String, Option<Value>)>,
|
|
response_tx: &UnboundedSender<Result<Value, AnyError>>,
|
|
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_rx.recv() => {
|
|
if let Some((method, params)) = result {
|
|
let result = repl_session
|
|
.post_message_with_event_loop(&method, params)
|
|
.await;
|
|
response_tx.send(result).unwrap();
|
|
}
|
|
|
|
poll_worker = true;
|
|
},
|
|
_ = repl_session.run_event_loop(), if poll_worker => {
|
|
poll_worker = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pub async fn run(
|
|
program_state: &ProgramState,
|
|
worker: MainWorker,
|
|
maybe_eval: Option<String>,
|
|
) -> Result<(), AnyError> {
|
|
let mut repl_session = ReplSession::initialize(worker).await?;
|
|
let (message_tx, mut message_rx) = channel(1);
|
|
let (response_tx, response_rx) = unbounded_channel();
|
|
|
|
let helper = EditorHelper {
|
|
context_id: repl_session.context_id,
|
|
message_tx,
|
|
response_rx: RefCell::new(response_rx),
|
|
};
|
|
|
|
let history_file_path = program_state.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 message_rx,
|
|
&response_tx,
|
|
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(())
|
|
}
|