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repl.js
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repl.js
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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
/* A REPL library that you can include in your own code to get a runtime
* interface to your program.
*
* const repl = require("repl");
* // start repl on stdin
* repl.start("prompt> ");
*
* // listen for unix socket connections and start repl on them
* net.createServer(function(socket) {
* repl.start("node via Unix socket> ", socket);
* }).listen("/tmp/node-repl-sock");
*
* // listen for TCP socket connections and start repl on them
* net.createServer(function(socket) {
* repl.start("node via TCP socket> ", socket);
* }).listen(5001);
*
* // expose foo to repl context
* repl.start("node > ").context.foo = "stdin is fun";
*/
'use strict';
const {
ArrayPrototypeConcat,
ArrayPrototypeFilter,
ArrayPrototypeFindIndex,
ArrayPrototypeForEach,
ArrayPrototypeIncludes,
ArrayPrototypeJoin,
ArrayPrototypeMap,
ArrayPrototypePop,
ArrayPrototypePush,
ArrayPrototypeReverse,
ArrayPrototypeShift,
ArrayPrototypeSlice,
ArrayPrototypeSome,
ArrayPrototypeSort,
ArrayPrototypeSplice,
ArrayPrototypeUnshift,
Boolean,
Error,
FunctionPrototypeBind,
MathMaxApply,
NumberIsNaN,
NumberParseFloat,
ObjectAssign,
ObjectCreate,
ObjectDefineProperty,
ObjectGetOwnPropertyDescriptor,
ObjectGetOwnPropertyNames,
ObjectGetPrototypeOf,
ObjectKeys,
ObjectSetPrototypeOf,
Promise,
PromiseRace,
ReflectApply,
RegExp,
RegExpPrototypeExec,
RegExpPrototypeSymbolReplace,
RegExpPrototypeTest,
SafeSet,
SafeWeakSet,
StringPrototypeCharAt,
StringPrototypeCodePointAt,
StringPrototypeEndsWith,
StringPrototypeIncludes,
StringPrototypeMatch,
StringPrototypeRepeat,
StringPrototypeReplace,
StringPrototypeSlice,
StringPrototypeSplit,
StringPrototypeStartsWith,
StringPrototypeTrim,
StringPrototypeTrimLeft,
Symbol,
SyntaxError,
SyntaxErrorPrototype,
globalThis,
} = primordials;
const { NativeModule } = require('internal/bootstrap/loaders');
const {
makeRequireFunction,
addBuiltinLibsToObject
} = require('internal/modules/cjs/helpers');
const {
isIdentifierStart,
isIdentifierChar
} = require('internal/deps/acorn/acorn/dist/acorn');
const {
decorateErrorStack,
isError,
deprecate
} = require('internal/util');
const { inspect } = require('internal/util/inspect');
const vm = require('vm');
const path = require('path');
const fs = require('fs');
const { Interface } = require('readline');
const {
commonPrefix
} = require('internal/readline/utils');
const { Console } = require('console');
const CJSModule = require('internal/modules/cjs/loader').Module;
let _builtinLibs = ArrayPrototypeFilter(
CJSModule.builtinModules,
(e) => !StringPrototypeStartsWith(e, '_'),
);
const nodeSchemeBuiltinLibs = ArrayPrototypeMap(
_builtinLibs, (lib) => `node:${lib}`);
ArrayPrototypeForEach(
NativeModule.getSchemeOnlyModuleNames(),
(lib) => ArrayPrototypePush(nodeSchemeBuiltinLibs, `node:${lib}`),
);
const domain = require('domain');
let debug = require('internal/util/debuglog').debuglog('repl', (fn) => {
debug = fn;
});
const {
codes: {
ERR_CANNOT_WATCH_SIGINT,
ERR_INVALID_REPL_EVAL_CONFIG,
ERR_INVALID_REPL_INPUT,
ERR_SCRIPT_EXECUTION_INTERRUPTED,
},
isErrorStackTraceLimitWritable,
overrideStackTrace,
} = require('internal/errors');
const { sendInspectorCommand } = require('internal/util/inspector');
const { getOptionValue } = require('internal/options');
const {
validateFunction,
validateObject,
} = require('internal/validators');
const experimentalREPLAwait = getOptionValue(
'--experimental-repl-await'
);
const pendingDeprecation = getOptionValue('--pending-deprecation');
const {
REPL_MODE_SLOPPY,
REPL_MODE_STRICT,
isRecoverableError,
kStandaloneREPL,
setupPreview,
setupReverseSearch,
} = require('internal/repl/utils');
const {
getOwnNonIndexProperties,
propertyFilter: {
ALL_PROPERTIES,
SKIP_SYMBOLS
}
} = internalBinding('util');
const {
startSigintWatchdog,
stopSigintWatchdog
} = internalBinding('contextify');
const history = require('internal/repl/history');
const {
extensionFormatMap,
legacyExtensionFormatMap,
} = require('internal/modules/esm/formats');
let nextREPLResourceNumber = 1;
// This prevents v8 code cache from getting confused and using a different
// cache from a resource of the same name
function getREPLResourceName() {
return `REPL${nextREPLResourceNumber++}`;
}
// Lazy-loaded.
let processTopLevelAwait;
const globalBuiltins =
new SafeSet(vm.runInNewContext('Object.getOwnPropertyNames(globalThis)'));
const parentModule = module;
const domainSet = new SafeWeakSet();
const kBufferedCommandSymbol = Symbol('bufferedCommand');
const kContextId = Symbol('contextId');
let addedNewListener = false;
try {
// Hack for require.resolve("./relative") to work properly.
module.filename = path.resolve('repl');
} catch {
// path.resolve('repl') fails when the current working directory has been
// deleted. Fall back to the directory name of the (absolute) executable
// path. It's not really correct but what are the alternatives?
const dirname = path.dirname(process.execPath);
module.filename = path.resolve(dirname, 'repl');
}
// Hack for repl require to work properly with node_modules folders
module.paths = CJSModule._nodeModulePaths(module.filename);
// This is the default "writer" value, if none is passed in the REPL options,
// and it can be overridden by custom print functions, such as `probe` or
// `eyes.js`.
const writer = (obj) => inspect(obj, writer.options);
writer.options = { ...inspect.defaultOptions, showProxy: true };
function REPLServer(prompt,
stream,
eval_,
useGlobal,
ignoreUndefined,
replMode) {
if (!(this instanceof REPLServer)) {
return new REPLServer(prompt,
stream,
eval_,
useGlobal,
ignoreUndefined,
replMode);
}
let options;
if (prompt !== null && typeof prompt === 'object') {
// An options object was given.
options = { ...prompt };
stream = options.stream || options.socket;
eval_ = options.eval;
useGlobal = options.useGlobal;
ignoreUndefined = options.ignoreUndefined;
prompt = options.prompt;
replMode = options.replMode;
} else {
options = {};
}
if (!options.input && !options.output) {
// Legacy API, passing a 'stream'/'socket' option.
if (!stream) {
// Use stdin and stdout as the default streams if none were given.
stream = process;
}
// We're given a duplex readable/writable Stream, like a `net.Socket`
// or a custom object with 2 streams, or the `process` object.
options.input = stream.stdin || stream;
options.output = stream.stdout || stream;
}
if (options.terminal === undefined) {
options.terminal = options.output.isTTY;
}
options.terminal = !!options.terminal;
if (options.terminal && options.useColors === undefined) {
// If possible, check if stdout supports colors or not.
if (options.output.hasColors) {
options.useColors = options.output.hasColors();
} else if (process.env.NODE_DISABLE_COLORS === undefined) {
options.useColors = true;
}
}
// TODO(devsnek): Add a test case for custom eval functions.
const preview = options.terminal &&
(options.preview !== undefined ? !!options.preview : !eval_);
ObjectDefineProperty(this, 'inputStream', {
get: pendingDeprecation ?
deprecate(() => this.input,
'repl.inputStream and repl.outputStream are deprecated. ' +
'Use repl.input and repl.output instead',
'DEP0141') :
() => this.input,
set: pendingDeprecation ?
deprecate((val) => this.input = val,
'repl.inputStream and repl.outputStream are deprecated. ' +
'Use repl.input and repl.output instead',
'DEP0141') :
(val) => this.input = val,
enumerable: false,
configurable: true
});
ObjectDefineProperty(this, 'outputStream', {
get: pendingDeprecation ?
deprecate(() => this.output,
'repl.inputStream and repl.outputStream are deprecated. ' +
'Use repl.input and repl.output instead',
'DEP0141') :
() => this.output,
set: pendingDeprecation ?
deprecate((val) => this.output = val,
'repl.inputStream and repl.outputStream are deprecated. ' +
'Use repl.input and repl.output instead',
'DEP0141') :
(val) => this.output = val,
enumerable: false,
configurable: true
});
this.allowBlockingCompletions = !!options.allowBlockingCompletions;
this.useColors = !!options.useColors;
this._domain = options.domain || domain.create();
this.useGlobal = !!useGlobal;
this.ignoreUndefined = !!ignoreUndefined;
this.replMode = replMode || module.exports.REPL_MODE_SLOPPY;
this.underscoreAssigned = false;
this.last = undefined;
this.underscoreErrAssigned = false;
this.lastError = undefined;
this.breakEvalOnSigint = !!options.breakEvalOnSigint;
this.editorMode = false;
// Context id for use with the inspector protocol.
this[kContextId] = undefined;
if (this.breakEvalOnSigint && eval_) {
// Allowing this would not reflect user expectations.
// breakEvalOnSigint affects only the behavior of the default eval().
throw new ERR_INVALID_REPL_EVAL_CONFIG();
}
if (options[kStandaloneREPL]) {
// It is possible to introspect the running REPL accessing this variable
// from inside the REPL. This is useful for anyone working on the REPL.
module.exports.repl = this;
} else if (!addedNewListener) {
// Add this listener only once and use a WeakSet that contains the REPLs
// domains. Otherwise we'd have to add a single listener to each REPL
// instance and that could trigger the `MaxListenersExceededWarning`.
process.prependListener('newListener', (event, listener) => {
if (event === 'uncaughtException' &&
process.domain &&
listener.name !== 'domainUncaughtExceptionClear' &&
domainSet.has(process.domain)) {
// Throw an error so that the event will not be added and the current
// domain takes over. That way the user is notified about the error
// and the current code evaluation is stopped, just as any other code
// that contains an error.
throw new ERR_INVALID_REPL_INPUT(
'Listeners for `uncaughtException` cannot be used in the REPL');
}
});
addedNewListener = true;
}
domainSet.add(this._domain);
const savedRegExMatches = ['', '', '', '', '', '', '', '', '', ''];
const sep = '\u0000\u0000\u0000';
const regExMatcher = new RegExp(`^${sep}(.*)${sep}(.*)${sep}(.*)${sep}(.*)` +
`${sep}(.*)${sep}(.*)${sep}(.*)${sep}(.*)` +
`${sep}(.*)$`);
eval_ = eval_ || defaultEval;
const self = this;
// Pause taking in new input, and store the keys in a buffer.
const pausedBuffer = [];
let paused = false;
function pause() {
paused = true;
}
function unpause() {
if (!paused) return;
paused = false;
let entry;
const tmpCompletionEnabled = self.isCompletionEnabled;
while ((entry = ArrayPrototypeShift(pausedBuffer)) !== undefined) {
const { 0: type, 1: payload, 2: isCompletionEnabled } = entry;
switch (type) {
case 'key': {
const { 0: d, 1: key } = payload;
self.isCompletionEnabled = isCompletionEnabled;
self._ttyWrite(d, key);
break;
}
case 'close':
self.emit('exit');
break;
}
if (paused) {
break;
}
}
self.isCompletionEnabled = tmpCompletionEnabled;
}
function defaultEval(code, context, file, cb) {
const asyncESM = require('internal/process/esm_loader');
let result, script, wrappedErr;
let err = null;
let wrappedCmd = false;
let awaitPromise = false;
const input = code;
// It's confusing for `{ a : 1 }` to be interpreted as a block
// statement rather than an object literal. So, we first try
// to wrap it in parentheses, so that it will be interpreted as
// an expression. Note that if the above condition changes,
// lib/internal/repl/utils.js needs to be changed to match.
if (RegExpPrototypeTest(/^\s*{/, code) &&
!RegExpPrototypeTest(/;\s*$/, code)) {
code = `(${StringPrototypeTrim(code)})\n`;
wrappedCmd = true;
}
// `experimentalREPLAwait` is set to true by default.
// Shall be false in case `--no-experimental-repl-await` flag is used.
if (experimentalREPLAwait && StringPrototypeIncludes(code, 'await')) {
if (processTopLevelAwait === undefined) {
({ processTopLevelAwait } = require('internal/repl/await'));
}
try {
const potentialWrappedCode = processTopLevelAwait(code);
if (potentialWrappedCode !== null) {
code = potentialWrappedCode;
wrappedCmd = true;
awaitPromise = true;
}
} catch (e) {
let recoverableError = false;
if (e.name === 'SyntaxError') {
let parentURL;
try {
const { pathToFileURL } = require('url');
// Adding `/repl` prevents dynamic imports from loading relative
// to the parent of `process.cwd()`.
parentURL = pathToFileURL(path.join(process.cwd(), 'repl')).href;
} catch {
// Continue regardless of error.
}
// Remove all "await"s and attempt running the script
// in order to detect if error is truly non recoverable
const fallbackCode = RegExpPrototypeSymbolReplace(/\bawait\b/g, code, '');
try {
vm.createScript(fallbackCode, {
filename: file,
displayErrors: true,
importModuleDynamically: (specifier, _, importAssertions) => {
return asyncESM.esmLoader.import(specifier, parentURL,
importAssertions);
}
});
} catch (fallbackError) {
if (isRecoverableError(fallbackError, fallbackCode)) {
recoverableError = true;
err = new Recoverable(e);
}
}
}
if (!recoverableError) {
decorateErrorStack(e);
err = e;
}
}
}
// First, create the Script object to check the syntax
if (code === '\n')
return cb(null);
if (err === null) {
let parentURL;
try {
const { pathToFileURL } = require('url');
// Adding `/repl` prevents dynamic imports from loading relative
// to the parent of `process.cwd()`.
parentURL = pathToFileURL(path.join(process.cwd(), 'repl')).href;
} catch {
// Continue regardless of error.
}
while (true) {
try {
if (self.replMode === module.exports.REPL_MODE_STRICT &&
!RegExpPrototypeTest(/^\s*$/, code)) {
// "void 0" keeps the repl from returning "use strict" as the result
// value for statements and declarations that don't return a value.
code = `'use strict'; void 0;\n${code}`;
}
script = vm.createScript(code, {
filename: file,
displayErrors: true,
importModuleDynamically: (specifier, _, importAssertions) => {
return asyncESM.esmLoader.import(specifier, parentURL,
importAssertions);
}
});
} catch (e) {
debug('parse error %j', code, e);
if (wrappedCmd) {
// Unwrap and try again
wrappedCmd = false;
awaitPromise = false;
code = input;
wrappedErr = e;
continue;
}
// Preserve original error for wrapped command
const error = wrappedErr || e;
if (isRecoverableError(error, code))
err = new Recoverable(error);
else
err = error;
}
break;
}
}
// This will set the values from `savedRegExMatches` to corresponding
// predefined RegExp properties `RegExp.$1`, `RegExp.$2` ... `RegExp.$9`
RegExpPrototypeTest(regExMatcher,
ArrayPrototypeJoin(savedRegExMatches, sep));
let finished = false;
function finishExecution(err, result) {
if (finished) return;
finished = true;
// After executing the current expression, store the values of RegExp
// predefined properties back in `savedRegExMatches`
for (let idx = 1; idx < savedRegExMatches.length; idx += 1) {
savedRegExMatches[idx] = RegExp[`$${idx}`];
}
cb(err, result);
}
if (!err) {
// Unset raw mode during evaluation so that Ctrl+C raises a signal.
let previouslyInRawMode;
if (self.breakEvalOnSigint) {
// Start the SIGINT watchdog before entering raw mode so that a very
// quick Ctrl+C doesn't lead to aborting the process completely.
if (!startSigintWatchdog())
throw new ERR_CANNOT_WATCH_SIGINT();
previouslyInRawMode = self._setRawMode(false);
}
try {
try {
const scriptOptions = {
displayErrors: false,
breakOnSigint: self.breakEvalOnSigint
};
if (self.useGlobal) {
result = script.runInThisContext(scriptOptions);
} else {
result = script.runInContext(context, scriptOptions);
}
} finally {
if (self.breakEvalOnSigint) {
// Reset terminal mode to its previous value.
self._setRawMode(previouslyInRawMode);
// Returns true if there were pending SIGINTs *after* the script
// has terminated without being interrupted itself.
if (stopSigintWatchdog()) {
self.emit('SIGINT');
}
}
}
} catch (e) {
err = e;
if (process.domain) {
debug('not recoverable, send to domain');
process.domain.emit('error', err);
process.domain.exit();
return;
}
}
if (awaitPromise && !err) {
let sigintListener;
pause();
let promise = result;
if (self.breakEvalOnSigint) {
const interrupt = new Promise((resolve, reject) => {
sigintListener = () => {
const tmp = Error.stackTraceLimit;
if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = 0;
const err = new ERR_SCRIPT_EXECUTION_INTERRUPTED();
if (isErrorStackTraceLimitWritable()) Error.stackTraceLimit = tmp;
reject(err);
};
prioritizedSigintQueue.add(sigintListener);
});
promise = PromiseRace([promise, interrupt]);
}
(async () => {
try {
const result = await promise;
finishExecution(null, result);
} catch (err) {
if (err && process.domain) {
debug('not recoverable, send to domain');
process.domain.emit('error', err);
process.domain.exit();
return;
}
finishExecution(err);
} finally {
// Remove prioritized SIGINT listener if it was not called.
prioritizedSigintQueue.delete(sigintListener);
unpause();
}
})();
}
}
if (!awaitPromise || err) {
finishExecution(err, result);
}
}
self.eval = self._domain.bind(eval_);
self._domain.on('error', function debugDomainError(e) {
debug('domain error');
let errStack = '';
if (typeof e === 'object' && e !== null) {
overrideStackTrace.set(e, (error, stackFrames) => {
let frames;
if (typeof stackFrames === 'object') {
// Search from the bottom of the call stack to
// find the first frame with a null function name
const idx = ArrayPrototypeFindIndex(
ArrayPrototypeReverse(stackFrames),
(frame) => frame.getFunctionName() === null
);
// If found, get rid of it and everything below it
frames = ArrayPrototypeSplice(stackFrames, idx + 1);
} else {
frames = stackFrames;
}
// FIXME(devsnek): this is inconsistent with the checks
// that the real prepareStackTrace dispatch uses in
// lib/internal/errors.js.
if (typeof Error.prepareStackTrace === 'function') {
return Error.prepareStackTrace(error, frames);
}
ArrayPrototypePush(frames, error);
return ArrayPrototypeJoin(ArrayPrototypeReverse(frames), '\n at ');
});
decorateErrorStack(e);
if (e.domainThrown) {
delete e.domain;
delete e.domainThrown;
}
if (isError(e)) {
if (e.stack) {
if (e.name === 'SyntaxError') {
// Remove stack trace.
e.stack = StringPrototypeReplace(StringPrototypeReplace(e.stack,
/^REPL\d+:\d+\r?\n/, ''),
/^\s+at\s.*\n?/gm, '');
const importErrorStr = 'Cannot use import statement outside a ' +
'module';
if (StringPrototypeIncludes(e.message, importErrorStr)) {
e.message = 'Cannot use import statement inside the Node.js ' +
'REPL, alternatively use dynamic import';
e.stack = StringPrototypeReplace(e.stack,
/SyntaxError:.*\n/,
`SyntaxError: ${e.message}\n`);
}
} else if (self.replMode === module.exports.REPL_MODE_STRICT) {
e.stack = StringPrototypeReplace(
e.stack,
/(\s+at\s+REPL\d+:)(\d+)/,
(_, pre, line) => pre + (line - 1)
);
}
}
errStack = self.writer(e);
// Remove one line error braces to keep the old style in place.
if (errStack[0] === '[' && errStack[errStack.length - 1] === ']') {
errStack = StringPrototypeSlice(errStack, 1, -1);
}
}
}
if (!self.underscoreErrAssigned) {
self.lastError = e;
}
if (options[kStandaloneREPL] &&
process.listenerCount('uncaughtException') !== 0) {
process.nextTick(() => {
process.emit('uncaughtException', e);
self.clearBufferedCommand();
self.lines.level = [];
self.displayPrompt();
});
} else {
if (errStack === '') {
errStack = self.writer(e);
}
const lines = StringPrototypeSplit(errStack, /(?<=\n)/);
let matched = false;
errStack = '';
ArrayPrototypeForEach(lines, (line) => {
if (!matched &&
RegExpPrototypeTest(/^\[?([A-Z][a-z0-9_]*)*Error/, line)) {
errStack += writer.options.breakLength >= line.length ?
`Uncaught ${line}` :
`Uncaught:\n${line}`;
matched = true;
} else {
errStack += line;
}
});
if (!matched) {
const ln = lines.length === 1 ? ' ' : ':\n';
errStack = `Uncaught${ln}${errStack}`;
}
// Normalize line endings.
errStack += StringPrototypeEndsWith(errStack, '\n') ? '' : '\n';
self.output.write(errStack);
self.clearBufferedCommand();
self.lines.level = [];
self.displayPrompt();
}
});
self.clearBufferedCommand();
function completer(text, cb) {
ReflectApply(complete, self,
[text, self.editorMode ? self.completeOnEditorMode(cb) : cb]);
}
ReflectApply(Interface, this, [{
input: options.input,
output: options.output,
completer: options.completer || completer,
terminal: options.terminal,
historySize: options.historySize,
prompt
}]);
self.resetContext();
this.commands = ObjectCreate(null);
defineDefaultCommands(this);
// Figure out which "writer" function to use
self.writer = options.writer || module.exports.writer;
if (self.writer === writer) {
// Conditionally turn on ANSI coloring.
writer.options.colors = self.useColors;
if (options[kStandaloneREPL]) {
ObjectDefineProperty(inspect, 'replDefaults', {
get() {
return writer.options;
},
set(options) {
validateObject(options, 'options');
return ObjectAssign(writer.options, options);
},
enumerable: true,
configurable: true
});
}
}
function _parseREPLKeyword(keyword, rest) {
const cmd = this.commands[keyword];
if (cmd) {
ReflectApply(cmd.action, this, [rest]);
return true;
}
return false;
}
self.on('close', function emitExit() {
if (paused) {
ArrayPrototypePush(pausedBuffer, ['close']);
return;
}
self.emit('exit');
});
let sawSIGINT = false;
let sawCtrlD = false;
const prioritizedSigintQueue = new SafeSet();
self.on('SIGINT', function onSigInt() {
if (prioritizedSigintQueue.size > 0) {
for (const task of prioritizedSigintQueue) {
task();
}
return;
}
const empty = self.line.length === 0;
self.clearLine();
_turnOffEditorMode(self);
const cmd = self[kBufferedCommandSymbol];
if (!(cmd && cmd.length > 0) && empty) {
if (sawSIGINT) {
self.close();
sawSIGINT = false;
return;
}
self.output.write(
'(To exit, press Ctrl+C again or Ctrl+D or type .exit)\n'
);
sawSIGINT = true;
} else {
sawSIGINT = false;
}
self.clearBufferedCommand();
self.lines.level = [];
self.displayPrompt();
});
self.on('line', function onLine(cmd) {
debug('line %j', cmd);
cmd = cmd || '';
sawSIGINT = false;
if (self.editorMode) {
self[kBufferedCommandSymbol] += cmd + '\n';
// code alignment
const matches = self._sawKeyPress ?
StringPrototypeMatch(cmd, /^\s+/) : null;
if (matches) {
const prefix = matches[0];
self.write(prefix);
self.line = prefix;
self.cursor = prefix.length;
}
ReflectApply(_memory, self, [cmd]);
return;
}
// Check REPL keywords and empty lines against a trimmed line input.
const trimmedCmd = StringPrototypeTrim(cmd);
// Check to see if a REPL keyword was used. If it returns true,
// display next prompt and return.
if (trimmedCmd) {
if (StringPrototypeCharAt(trimmedCmd, 0) === '.' &&
StringPrototypeCharAt(trimmedCmd, 1) !== '.' &&
NumberIsNaN(NumberParseFloat(trimmedCmd))) {
const matches = StringPrototypeMatch(trimmedCmd, /^\.([^\s]+)\s*(.*)$/);
const keyword = matches && matches[1];
const rest = matches && matches[2];
if (ReflectApply(_parseREPLKeyword, self, [keyword, rest]) === true) {
return;
}
if (!self[kBufferedCommandSymbol]) {
self.output.write('Invalid REPL keyword\n');
finish(null);
return;
}
}
}
const evalCmd = self[kBufferedCommandSymbol] + cmd + '\n';
debug('eval %j', evalCmd);
self.eval(evalCmd, self.context, getREPLResourceName(), finish);
function finish(e, ret) {
debug('finish', e, ret);
ReflectApply(_memory, self, [cmd]);
if (e && !self[kBufferedCommandSymbol] &&
StringPrototypeStartsWith(StringPrototypeTrim(cmd), 'npm ')) {
self.output.write('npm should be run outside of the ' +
'Node.js REPL, in your normal shell.\n' +
'(Press Ctrl+D to exit.)\n');
self.displayPrompt();
return;
}
// If error was SyntaxError and not JSON.parse error
if (e) {
if (e instanceof Recoverable && !sawCtrlD) {
// Start buffering data like that:
// {
// ... x: 1
// ... }
self[kBufferedCommandSymbol] += cmd + '\n';
self.displayPrompt();
return;
}
self._domain.emit('error', e.err || e);
}
// Clear buffer if no SyntaxErrors
self.clearBufferedCommand();
sawCtrlD = false;
// If we got any output - print it (if no error)
if (!e &&
// When an invalid REPL command is used, error message is printed
// immediately. We don't have to print anything else. So, only when
// the second argument to this function is there, print it.
arguments.length === 2 &&
(!self.ignoreUndefined || ret !== undefined)) {
if (!self.underscoreAssigned) {
self.last = ret;
}
self.output.write(self.writer(ret) + '\n');
}
// Display prompt again (unless we already did by emitting the 'error'
// event on the domain instance).
if (!e) {
self.displayPrompt();
}
}
});
self.on('SIGCONT', function onSigCont() {
if (self.editorMode) {
self.output.write(`${self._initialPrompt}.editor\n`);
self.output.write(
'// Entering editor mode (Ctrl+D to finish, Ctrl+C to cancel)\n');
self.output.write(`${self[kBufferedCommandSymbol]}\n`);
self.prompt(true);
} else {
self.displayPrompt(true);
}
});
const { reverseSearch } = setupReverseSearch(this);
const {
clearPreview,
showPreview
} = setupPreview(
this,
kContextId,
kBufferedCommandSymbol,
preview
);
// Wrap readline tty to enable editor mode and pausing.
const ttyWrite = FunctionPrototypeBind(self._ttyWrite, self);
self._ttyWrite = (d, key) => {
key = key || {};
if (paused && !(self.breakEvalOnSigint && key.ctrl && key.name === 'c')) {
ArrayPrototypePush(pausedBuffer,
['key', [d, key], self.isCompletionEnabled]);
return;
}
if (!self.editorMode || !self.terminal) {
// Before exiting, make sure to clear the line.
if (key.ctrl && key.name === 'd' &&
self.cursor === 0 && self.line.length === 0) {
self.clearLine();
}
clearPreview(key);
if (!reverseSearch(d, key)) {
ttyWrite(d, key);
if (key.name !== 'escape') {
showPreview();
}
}
return;
}