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node/lib/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 {
ArrayPrototypeAt,
ArrayPrototypeFilter,
ArrayPrototypeFindLastIndex,
ArrayPrototypeForEach,
ArrayPrototypeIncludes,
ArrayPrototypeJoin,
ArrayPrototypeMap,
ArrayPrototypePop,
ArrayPrototypePush,
ArrayPrototypePushApply,
ArrayPrototypeShift,
ArrayPrototypeSlice,
ArrayPrototypeSome,
ArrayPrototypeSort,
ArrayPrototypeUnshift,
Boolean,
Error: MainContextError,
FunctionPrototypeBind,
JSONStringify,
MathMaxApply,
NumberIsNaN,
NumberParseFloat,
ObjectAssign,
ObjectDefineProperty,
ObjectGetOwnPropertyDescriptor,
ObjectGetOwnPropertyNames,
ObjectGetPrototypeOf,
ObjectKeys,
ObjectSetPrototypeOf,
Promise,
ReflectApply,
RegExp,
RegExpPrototypeExec,
SafePromiseRace,
SafeSet,
SafeWeakSet,
StringPrototypeCharAt,
StringPrototypeCodePointAt,
StringPrototypeEndsWith,
StringPrototypeIncludes,
StringPrototypeRepeat,
StringPrototypeSlice,
StringPrototypeSplit,
StringPrototypeStartsWith,
StringPrototypeToLocaleLowerCase,
StringPrototypeTrim,
StringPrototypeTrimStart,
Symbol,
SyntaxError,
SyntaxErrorPrototype,
globalThis,
} = primordials;
const { BuiltinModule } = require('internal/bootstrap/realm');
const {
makeRequireFunction,
addBuiltinLibsToObject,
} = require('internal/modules/helpers');
const {
isIdentifierStart,
isIdentifierChar,
parse: acornParse,
} = require('internal/deps/acorn/acorn/dist/acorn');
const acornWalk = require('internal/deps/acorn/acorn-walk/dist/walk');
const {
decorateErrorStack,
isError,
deprecate,
SideEffectFreeRegExpPrototypeSymbolReplace,
SideEffectFreeRegExpPrototypeSymbolSplit,
} = require('internal/util');
const { inspect } = require('internal/util/inspect');
const vm = require('vm');
const { runInThisContext, runInContext } = vm.Script.prototype;
const path = require('path');
const fs = require('fs');
const { Interface } = require('readline');
const {
commonPrefix,
} = require('internal/readline/utils');
const { Console } = require('console');
const { shouldColorize } = require('internal/util/colors');
const CJSModule = require('internal/modules/cjs/loader').Module;
let _builtinLibs = ArrayPrototypeFilter(
CJSModule.builtinModules,
(e) => !StringPrototypeStartsWith(e, '_'),
);
const nodeSchemeBuiltinLibs = ArrayPrototypeMap(
_builtinLibs, (lib) => `node:${lib}`);
ArrayPrototypeForEach(
BuiltinModule.getSchemeOnlyModuleNames(),
(lib) => ArrayPrototypePush(nodeSchemeBuiltinLibs, `node:${lib}`),
);
const domain = require('domain');
let debug = require('internal/util/debuglog').debuglog('repl', (fn) => {
debug = fn;
});
const {
ErrorPrepareStackTrace,
codes: {
ERR_CANNOT_WATCH_SIGINT,
ERR_INVALID_REPL_EVAL_CONFIG,
ERR_INVALID_REPL_INPUT,
ERR_MISSING_ARGS,
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 {
constants: {
ALL_PROPERTIES,
SKIP_SYMBOLS,
},
getOwnNonIndexProperties,
} = internalBinding('util');
const {
startSigintWatchdog,
stopSigintWatchdog,
} = internalBinding('contextify');
const history = require('internal/repl/history');
const {
extensionFormatMap,
} = require('internal/modules/esm/formats');
const {
makeContextifyScript,
} = require('internal/vm');
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${nextREPLResourceNumber++}`;
}
// Lazy-loaded.
let processTopLevelAwait;
const globalBuiltins =
new SafeSet(vm.runInNewContext('Object.getOwnPropertyNames(globalThis)'));
const parentModule = module;
const domainSet = new SafeWeakSet();
const kBufferedCommandSymbol = Symbol('bufferedCommand');
const kContextId = Symbol('contextId');
const kLoadingSymbol = Symbol('loading');
let addedNewListener = false;
try {
// Hack for require.resolve("./relative") to work properly.
module.filename = path.resolve('repl');
} catch {
// path.resolve('repl') fails when the current working directory has been
// deleted. Fall back to the directory name of the (absolute) executable
// path. It's not really correct but what are the alternatives?
const dirname = path.dirname(process.execPath);
module.filename = path.resolve(dirname, 'repl');
}
// Hack for repl require to work properly with node_modules folders
module.paths = CJSModule._nodeModulePaths(module.filename);
// This is the default "writer" value, if none is passed in the REPL options,
// and it can be overridden by custom print functions, such as `probe` or
// `eyes.js`.
const writer = (obj) => inspect(obj, writer.options);
writer.options = { ...inspect.defaultOptions, showProxy: true };
// Converts static import statement to dynamic import statement
const toDynamicImport = (codeLine) => {
let dynamicImportStatement = '';
const ast = acornParse(codeLine, { __proto__: null, sourceType: 'module', ecmaVersion: 'latest' });
acornWalk.ancestor(ast, {
ImportDeclaration(node) {
const awaitDynamicImport = `await import(${JSONStringify(node.source.value)});`;
if (node.specifiers.length === 0) {
dynamicImportStatement += awaitDynamicImport;
} else if (node.specifiers.length === 1 && node.specifiers[0].type === 'ImportNamespaceSpecifier') {
dynamicImportStatement += `const ${node.specifiers[0].local.name} = ${awaitDynamicImport}`;
} else {
const importNames = ArrayPrototypeJoin(ArrayPrototypeMap(node.specifiers, ({ local, imported }) =>
(local.name === imported?.name ? local.name : `${imported?.name ?? 'default'}: ${local.name}`),
), ', ');
dynamicImportStatement += `const { ${importNames} } = ${awaitDynamicImport}`;
}
},
});
return dynamicImportStatement;
};
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.
options.useColors = shouldColorize(options.output);
}
// TODO(devsnek): Add a test case for custom eval functions.
const preview = options.terminal &&
(options.preview !== undefined ? !!options.preview : !eval_);
ObjectDefineProperty(this, 'inputStream', {
__proto__: null,
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', {
__proto__: null,
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}(.*)$`);
eval_ = eval_ || defaultEval;
const self = this;
// Pause taking in new input, and store the keys in a buffer.
const pausedBuffer = [];
let paused = false;
function pause() {
paused = true;
}
function unpause() {
if (!paused) return;
paused = false;
let entry;
const tmpCompletionEnabled = self.isCompletionEnabled;
while ((entry = ArrayPrototypeShift(pausedBuffer)) !== undefined) {
const { 0: type, 1: payload, 2: isCompletionEnabled } = entry;
switch (type) {
case 'key': {
const { 0: d, 1: key } = payload;
self.isCompletionEnabled = isCompletionEnabled;
self._ttyWrite(d, key);
break;
}
case 'close':
self.emit('exit');
break;
}
if (paused) {
break;
}
}
self.isCompletionEnabled = tmpCompletionEnabled;
}
function defaultEval(code, context, file, cb) {
let result, script, wrappedErr;
let err = null;
let wrappedCmd = false;
let awaitPromise = false;
const input = code;
// It's confusing for `{ a : 1 }` to be interpreted as a block
// statement rather than an object literal. So, we first try
// to wrap it in parentheses, so that it will be interpreted as
// an expression. Note that if the above condition changes,
// lib/internal/repl/utils.js needs to be changed to match.
if (RegExpPrototypeExec(/^\s*{/, code) !== null &&
RegExpPrototypeExec(/;\s*$/, code) === null) {
code = `(${StringPrototypeTrim(code)})\n`;
wrappedCmd = true;
}
const hostDefinedOptionId = Symbol(`eval:${file}`);
let parentURL;
try {
const { pathToFileURL } = require('internal/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.
}
async function importModuleDynamically(specifier, _, importAttributes) {
const cascadedLoader = require('internal/modules/esm/loader').getOrInitializeCascadedLoader();
return cascadedLoader.import(specifier, parentURL, importAttributes);
}
// `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') {
// Remove all "await"s and attempt running the script
// in order to detect if error is truly non recoverable
const fallbackCode = SideEffectFreeRegExpPrototypeSymbolReplace(/\bawait\b/g, code, '');
try {
makeContextifyScript(
fallbackCode, // code
file, // filename,
0, // lineOffset
0, // columnOffset,
undefined, // cachedData
false, // produceCachedData
undefined, // parsingContext
hostDefinedOptionId, // hostDefinedOptionId
importModuleDynamically, // importModuleDynamically
);
} 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) {
while (true) {
try {
if (self.replMode === module.exports.REPL_MODE_STRICT &&
RegExpPrototypeExec(/^\s*$/, code) === null) {
// "void 0" keeps the repl from returning "use strict" as the result
// value for statements and declarations that don't return a value.
code = `'use strict'; void 0;\n${code}`;
}
script = makeContextifyScript(
code, // code
file, // filename,
0, // lineOffset
0, // columnOffset,
undefined, // cachedData
false, // produceCachedData
undefined, // parsingContext
hostDefinedOptionId, // hostDefinedOptionId
importModuleDynamically, // importModuleDynamically
);
} 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`
RegExpPrototypeExec(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 = ReflectApply(runInThisContext, script, [scriptOptions]);
} else {
result = ReflectApply(runInContext, script, [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 = MainContextError.stackTraceLimit;
if (isErrorStackTraceLimitWritable()) MainContextError.stackTraceLimit = 0;
const err = new ERR_SCRIPT_EXECUTION_INTERRUPTED();
if (isErrorStackTraceLimitWritable()) MainContextError.stackTraceLimit = tmp;
reject(err);
};
prioritizedSigintQueue.add(sigintListener);
});
promise = SafePromiseRace([promise, interrupt]);
}
(async () => {
try {
const result = (await promise)?.value;
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 = ArrayPrototypeFindLastIndex(
stackFrames,
(frame) => frame.getFunctionName() === null,
);
// If found, get rid of it and everything below it
frames = ArrayPrototypeSlice(stackFrames, 0, idx);
} else {
frames = stackFrames;
}
// FIXME(devsnek): this is inconsistent with the checks
// that the real prepareStackTrace dispatch uses in
// lib/internal/errors.js.
if (typeof MainContextError.prepareStackTrace === 'function') {
return MainContextError.prepareStackTrace(error, frames);
}
return ErrorPrepareStackTrace(error, frames);
});
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 = SideEffectFreeRegExpPrototypeSymbolReplace(
/^\s+at\s.*\n?/gm,
SideEffectFreeRegExpPrototypeSymbolReplace(/^REPL\d+:\d+\r?\n/, e.stack, ''),
'');
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: ' + toDynamicImport(ArrayPrototypeAt(self.lines, -1));
e.stack = SideEffectFreeRegExpPrototypeSymbolReplace(
/SyntaxError:.*\n/,
e.stack,
`SyntaxError: ${e.message}\n`);
}
} else if (self.replMode === module.exports.REPL_MODE_STRICT) {
e.stack = SideEffectFreeRegExpPrototypeSymbolReplace(
/(\s+at\s+REPL\d+:)(\d+)/,
e.stack,
(_, 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 = SideEffectFreeRegExpPrototypeSymbolSplit(/(?<=\n)/, errStack);
let matched = false;
errStack = '';
ArrayPrototypeForEach(lines, (line) => {
if (!matched &&
RegExpPrototypeExec(/^\[?([A-Z][a-z0-9_]*)*Error/, line) !== null) {
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 = { __proto__: 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', {
__proto__: null,
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 && !self[kLoadingSymbol] ?
RegExpPrototypeExec(/^\s+/, cmd) : 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 = RegExpPrototypeExec(/^\.([^\s]+)\s*(.*)$/, trimmedCmd);
const keyword = matches && matches[1];
const rest = matches && matches[2];
if (ReflectApply(_parseREPLKeyword, self, [keyword, rest]) === true) {
return;
}
if (!self[kBufferedCommandSymbol]) {
self.output.write('Invalid REPL keyword\n');
finish(null);
return;
}
}
}
const evalCmd = self[kBufferedCommandSymbol] + cmd + '\n';
debug('eval %j', evalCmd);
self.eval(evalCmd, self.context, getREPLResourceName(), finish);
function finish(e, ret) {
debug('finish', e, ret);
ReflectApply(_memory, self, [cmd]);
if (e && !self[kBufferedCommandSymbol] &&
StringPrototypeStartsWith(StringPrototypeTrim(cmd), 'npm ') &&
!(e instanceof Recoverable)
) {
self.output.write('npm should be run outside of the ' +
'Node.js REPL, in your normal shell.\n' +
'(Press Ctrl+D to exit.)\n');
self.displayPrompt();
return;
}
// If error was SyntaxError and not JSON.parse error
if (e) {
if (e instanceof Recoverable && !sawCtrlD) {
// Start buffering data like that:
// {
// ... x: 1
// ... }
self[kBufferedCommandSymbol] += cmd + '\n';
self.displayPrompt();
return;
}
self._domain.emit('error', e.err || e);
}
// Clear buffer if no SyntaxErrors
self.clearBufferedCommand();
sawCtrlD = false;
// If we got any output - print it (if no error)
if (!e &&
// When an invalid REPL command is used, error message is printed
// immediately. We don't have to print anything else. So, only when
// the second argument to this function is there, print it.
arguments.length === 2 &&
(!self.ignoreUndefined || ret !== undefined)) {
if (!self.underscoreAssigned) {
self.last = ret;
}
self.output.write(self.writer(ret) + '\n');
}
// Display prompt again (unless we already did by emitting the 'error'
// event on the domain instance).
if (!e) {
self.displayPrompt();
}
}
});
self.on('SIGCONT', function onSigCont() {
if (self.editorMode) {
self.output.write(`${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);
const showCompletionPreview = key.name !== 'escape';
showPreview(showCompletionPreview);
}
return;
}
// Editor mode
if (key.ctrl && !key.shift) {
switch (key.name) {
// TODO(BridgeAR): There should not be a special mode necessary for full
// multiline support.
case 'd': // End editor mode
_turnOffEditorMode(self);
sawCtrlD = true;
ttyWrite(d, { name: 'return' });
break;
case 'n': // Override next history item
case 'p': // Override previous history item
break;
default:
ttyWrite(d, key);
}
} else {
switch (key.name) {
case 'up': // Override previous history item
case 'down': // Override next history item
break;
case 'tab':
// Prevent double tab behavior
self._previousKey = null;
ttyWrite(d, key);
break;
default:
ttyWrite(d, key);
}
}
};
self.displayPrompt();
}
ObjectSetPrototypeOf(REPLServer.prototype, Interface.prototype);
ObjectSetPrototypeOf(REPLServer, Interface);
// Prompt is a string to print on each line for the prompt,
// source is a stream to use for I/O, defaulting to stdin/stdout.
function start(prompt, source, eval_, useGlobal, ignoreUndefined, replMode) {
return new REPLServer(
prompt, source, eval_, useGlobal, ignoreUndefined, replMode);
}
REPLServer.prototype.setupHistory = function setupHistory(historyFile, cb) {
history(this, historyFile, cb);
};
REPLServer.prototype.clearBufferedCommand = function clearBufferedCommand() {
this[kBufferedCommandSymbol] = '';
};
REPLServer.prototype.close = function close() {
if (this.terminal && this._flushing && !this._closingOnFlush) {
this._closingOnFlush = true;
this.once('flushHistory', () =>
ReflectApply(Interface.prototype.close, this, []),
);
return;
}
process.nextTick(() =>
ReflectApply(Interface.prototype.close, this, []),
);
};
REPLServer.prototype.createContext = function() {
let context;
if (this.useGlobal) {
context = globalThis;
} else {
sendInspectorCommand((session) => {
session.post('Runtime.enable');
session.once('Runtime.executionContextCreated', ({ params }) => {
this[kContextId] = params.context.id;
});
context = vm.createContext();
session.post('Runtime.disable');
}, () => {
context = vm.createContext();
});
ArrayPrototypeForEach(ObjectGetOwnPropertyNames(globalThis), (name) => {
// Only set properties that do not already exist as a global builtin.
if (!globalBuiltins.has(name)) {
ObjectDefineProperty(context, name,
{
__proto__: null,
...ObjectGetOwnPropertyDescriptor(globalThis, name),
});
}
});
context.global = context;
const _console = new Console(this.output);
ObjectDefineProperty(context, 'console', {
__proto__: null,
configurable: true,
writable: true,
value: _console,
});
}
const replModule = new CJSModule('<repl>');
replModule.paths = CJSModule._resolveLookupPaths('<repl>', parentModule);
ObjectDefineProperty(context, 'module', {
__proto__: null,
configurable: true,
writable: true,
value: replModule,
});
ObjectDefineProperty(context, 'require', {
__proto__: null,
configurable: true,
writable: true,
value: makeRequireFunction(replModule),
});
addBuiltinLibsToObject(context, '<REPL>');
return context;
};
REPLServer.prototype.resetContext = function() {
this.context = this.createContext();
this.underscoreAssigned = false;
this.underscoreErrAssigned = false;
// TODO(BridgeAR): Deprecate the lines.
this.lines = [];
this.lines.level = [];
ObjectDefineProperty(this.context, '_', {
__proto__: null,
configurable: true,
get: () => this.last,
set: (value) => {
this.last = value;
if (!this.underscoreAssigned) {
this.underscoreAssigned = true;
this.output.write('Expression assignment to _ now disabled.\n');
}
},
});
ObjectDefineProperty(this.context, '_error', {
__proto__: null,
configurable: true,
get: () => this.lastError,
set: (value) => {
this.lastError = value;
if (!this.underscoreErrAssigned) {
this.underscoreErrAssigned = true;
this.output.write(
'Expression assignment to _error now disabled.\n');
}
},
});
// Allow REPL extensions to extend the new context
this.emit('reset', this.context);
};
REPLServer.prototype.displayPrompt = function(preserveCursor) {
let prompt = this._initialPrompt;
if (this[kBufferedCommandSymbol].length) {
prompt = '...';
const len = this.lines.level.length ? this.lines.level.length - 1 : 0;
const levelInd = StringPrototypeRepeat('..', len);
prompt += levelInd + ' ';
}
// Do not overwrite `_initialPrompt` here
ReflectApply(Interface.prototype.setPrompt, this, [prompt]);
this.prompt(preserveCursor);
};
// When invoked as an API method, overwrite _initialPrompt
REPLServer.prototype.setPrompt = function setPrompt(prompt) {
this._initialPrompt = prompt;
ReflectApply(Interface.prototype.setPrompt, this, [prompt]);
};
const importRE = /\bimport\s*\(\s*['"`](([\w@./:-]+\/)?(?:[\w@./:-]*))(?![^'"`])$/;
const requireRE = /\brequire\s*\(\s*['"`](([\w@./:-]+\/)?(?:[\w@./:-]*))(?![^'"`])$/;
const fsAutoCompleteRE = /fs(?:\.promises)?\.\s*[a-z][a-zA-Z]+\(\s*["'](.*)/;
const simpleExpressionRE =
/(?:[\w$'"`[{(](?:\w|\$|['"`\]})])*\??\.)*[a-zA-Z_$](?:\w|\$)*\??\.?$/;
const versionedFileNamesRe = /-\d+\.\d+/;
function isIdentifier(str) {
if (str === '') {
return false;
}
const first = StringPrototypeCodePointAt(str, 0);
if (!isIdentifierStart(first)) {
return false;
}
const firstLen = first > 0xffff ? 2 : 1;
for (let i = firstLen; i < str.length; i += 1) {
const cp = StringPrototypeCodePointAt(str, i);
if (!isIdentifierChar(cp)) {
return false;
}
if (cp > 0xffff) {
i += 1;
}
}
return true;
}
function isNotLegacyObjectPrototypeMethod(str) {
return isIdentifier(str) &&
str !== '__defineGetter__' &&
str !== '__defineSetter__' &&
str !== '__lookupGetter__' &&
str !== '__lookupSetter__';
}
function filteredOwnPropertyNames(obj) {
if (!obj) return [];
// `Object.prototype` is the only non-contrived object that fulfills
// `Object.getPrototypeOf(X) === null &&
// Object.getPrototypeOf(Object.getPrototypeOf(X.constructor)) === X`.
let isObjectPrototype = false;
if (ObjectGetPrototypeOf(obj) === null) {
const ctorDescriptor = ObjectGetOwnPropertyDescriptor(obj, 'constructor');
if (ctorDescriptor && ctorDescriptor.value) {
const ctorProto = ObjectGetPrototypeOf(ctorDescriptor.value);
isObjectPrototype = ctorProto && ObjectGetPrototypeOf(ctorProto) === obj;
}
}
const filter = ALL_PROPERTIES | SKIP_SYMBOLS;
return ArrayPrototypeFilter(
getOwnNonIndexProperties(obj, filter),
isObjectPrototype ? isNotLegacyObjectPrototypeMethod : isIdentifier);
}
function getGlobalLexicalScopeNames(contextId) {
return sendInspectorCommand((session) => {
let names = [];
session.post('Runtime.globalLexicalScopeNames', {
executionContextId: contextId,
}, (error, result) => {
if (!error) names = result.names;
});
return names;
}, () => []);
}
REPLServer.prototype.complete = function() {
ReflectApply(this.completer, this, arguments);
};
function gracefulReaddir(...args) {
try {
return ReflectApply(fs.readdirSync, null, args);
} catch {
// Continue regardless of error.
}
}
function completeFSFunctions(match) {
let baseName = '';
let filePath = match[1];
let fileList = gracefulReaddir(filePath, { withFileTypes: true });
if (!fileList) {
baseName = path.basename(filePath);
filePath = path.dirname(filePath);
fileList = gracefulReaddir(filePath, { withFileTypes: true }) || [];
}
const completions = ArrayPrototypeMap(
ArrayPrototypeFilter(
fileList,
(dirent) => StringPrototypeStartsWith(dirent.name, baseName),
),
(d) => d.name,
);
return [[completions], baseName];
}
// Provide a list of completions for the given leading text. This is
// given to the readline interface for handling tab completion.
//
// Example:
// complete('let foo = util.')
// -> [['util.print', 'util.debug', 'util.log', 'util.inspect'],
// 'util.' ]
//
// Warning: This eval's code like "foo.bar.baz", so it will run property
// getter code.
function complete(line, callback) {
// List of completion lists, one for each inheritance "level"
let completionGroups = [];
let completeOn, group;
// Ignore right whitespace. It could change the outcome.
line = StringPrototypeTrimStart(line);
let filter = '';
let match;
// REPL commands (e.g. ".break").
if ((match = RegExpPrototypeExec(/^\s*\.(\w*)$/, line)) !== null) {
ArrayPrototypePush(completionGroups, ObjectKeys(this.commands));
completeOn = match[1];
if (completeOn.length) {
filter = completeOn;
}
} else if ((match = RegExpPrototypeExec(requireRE, line)) !== null) {
// require('...<Tab>')
completeOn = match[1];
filter = completeOn;
if (this.allowBlockingCompletions) {
const subdir = match[2] || '';
const extensions = ObjectKeys(this.context.require.extensions);
const indexes = ArrayPrototypeMap(extensions,
(extension) => `index${extension}`);
ArrayPrototypePush(indexes, 'package.json', 'index');
group = [];
let paths = [];
if (completeOn === '.') {
group = ['./', '../'];
} else if (completeOn === '..') {
group = ['../'];
} else if (RegExpPrototypeExec(/^\.\.?\//, completeOn) !== null) {
paths = [process.cwd()];
} else {
paths = [];
ArrayPrototypePushApply(paths, module.paths);
ArrayPrototypePushApply(paths, CJSModule.globalPaths);
}
ArrayPrototypeForEach(paths, (dir) => {
dir = path.resolve(dir, subdir);
const dirents = gracefulReaddir(dir, { withFileTypes: true }) || [];
ArrayPrototypeForEach(dirents, (dirent) => {
if (RegExpPrototypeExec(versionedFileNamesRe, dirent.name) !== null ||
dirent.name === '.npm') {
// Exclude versioned names that 'npm' installs.
return;
}
const extension = path.extname(dirent.name);
const base = StringPrototypeSlice(dirent.name, 0, -extension.length);
if (!dirent.isDirectory()) {
if (StringPrototypeIncludes(extensions, extension) &&
(!subdir || base !== 'index')) {
ArrayPrototypePush(group, `${subdir}${base}`);
}
return;
}
ArrayPrototypePush(group, `${subdir}${dirent.name}/`);
const absolute = path.resolve(dir, dirent.name);
if (ArrayPrototypeSome(
gracefulReaddir(absolute) || [],
(subfile) => ArrayPrototypeIncludes(indexes, subfile),
)) {
ArrayPrototypePush(group, `${subdir}${dirent.name}`);
}
});
});
if (group.length) {
ArrayPrototypePush(completionGroups, group);
}
}
ArrayPrototypePush(completionGroups, _builtinLibs, nodeSchemeBuiltinLibs);
} else if ((match = RegExpPrototypeExec(importRE, line)) !== null) {
// import('...<Tab>')
completeOn = match[1];
filter = completeOn;
if (this.allowBlockingCompletions) {
const subdir = match[2] || '';
// File extensions that can be imported:
const extensions = ObjectKeys(extensionFormatMap);
// Only used when loading bare module specifiers from `node_modules`:
const indexes = ArrayPrototypeMap(extensions, (ext) => `index${ext}`);
ArrayPrototypePush(indexes, 'package.json');
group = [];
let paths = [];
if (completeOn === '.') {
group = ['./', '../'];
} else if (completeOn === '..') {
group = ['../'];
} else if (RegExpPrototypeExec(/^\.\.?\//, completeOn) !== null) {
paths = [process.cwd()];
} else {
paths = ArrayPrototypeSlice(module.paths);
}
ArrayPrototypeForEach(paths, (dir) => {
dir = path.resolve(dir, subdir);
const isInNodeModules = path.basename(dir) === 'node_modules';
const dirents = gracefulReaddir(dir, { withFileTypes: true }) || [];
ArrayPrototypeForEach(dirents, (dirent) => {
const { name } = dirent;
if (RegExpPrototypeExec(versionedFileNamesRe, name) !== null ||
name === '.npm') {
// Exclude versioned names that 'npm' installs.
return;
}
if (!dirent.isDirectory()) {
const extension = path.extname(name);
if (StringPrototypeIncludes(extensions, extension)) {
ArrayPrototypePush(group, `${subdir}${name}`);
}
return;
}
ArrayPrototypePush(group, `${subdir}${name}/`);
if (!subdir && isInNodeModules) {
const absolute = path.resolve(dir, name);
const subfiles = gracefulReaddir(absolute) || [];
if (ArrayPrototypeSome(subfiles, (subfile) => {
return ArrayPrototypeIncludes(indexes, subfile);
})) {
ArrayPrototypePush(group, `${subdir}${name}`);
}
}
});
});
if (group.length) {
ArrayPrototypePush(completionGroups, group);
}
}
ArrayPrototypePush(completionGroups, _builtinLibs, nodeSchemeBuiltinLibs);
} else if ((match = RegExpPrototypeExec(fsAutoCompleteRE, line)) !== null &&
this.allowBlockingCompletions) {
({ 0: completionGroups, 1: completeOn } = completeFSFunctions(match));
// Handle variable member lookup.
// We support simple chained expressions like the following (no function
// calls, etc.). That is for simplicity and also because we *eval* that
// leading expression so for safety (see WARNING above) don't want to
// eval function calls.
//
// foo.bar<|> # completions for 'foo' with filter 'bar'
// spam.eggs.<|> # completions for 'spam.eggs' with filter ''
// foo<|> # all scope vars with filter 'foo'
// foo.<|> # completions for 'foo' with filter ''
} else if (line.length === 0 ||
RegExpPrototypeExec(/\w|\.|\$/, line[line.length - 1]) !== null) {
const { 0: match } = RegExpPrototypeExec(simpleExpressionRE, line) || [''];
if (line.length !== 0 && !match) {
completionGroupsLoaded();
return;
}
let expr = '';
completeOn = match;
if (StringPrototypeEndsWith(line, '.')) {
expr = StringPrototypeSlice(match, 0, -1);
} else if (line.length !== 0) {
const bits = StringPrototypeSplit(match, '.');
filter = ArrayPrototypePop(bits);
expr = ArrayPrototypeJoin(bits, '.');
}
// Resolve expr and get its completions.
if (!expr) {
// Get global vars synchronously
ArrayPrototypePush(completionGroups,
getGlobalLexicalScopeNames(this[kContextId]));
let contextProto = this.context;
while ((contextProto = ObjectGetPrototypeOf(contextProto)) !== null) {
ArrayPrototypePush(completionGroups,
filteredOwnPropertyNames(contextProto));
}
const contextOwnNames = filteredOwnPropertyNames(this.context);
if (!this.useGlobal) {
// When the context is not `global`, builtins are not own
// properties of it.
// `globalBuiltins` is a `SafeSet`, not an Array-like.
ArrayPrototypePush(contextOwnNames, ...globalBuiltins);
}
ArrayPrototypePush(completionGroups, contextOwnNames);
if (filter !== '') addCommonWords(completionGroups);
completionGroupsLoaded();
return;
}
let chaining = '.';
if (StringPrototypeEndsWith(expr, '?')) {
expr = StringPrototypeSlice(expr, 0, -1);
chaining = '?.';
}
const memberGroups = [];
const evalExpr = `try { ${expr} } catch {}`;
this.eval(evalExpr, this.context, getREPLResourceName(), (e, obj) => {
try {
let p;
if ((typeof obj === 'object' && obj !== null) ||
typeof obj === 'function') {
ArrayPrototypePush(memberGroups, filteredOwnPropertyNames(obj));
p = ObjectGetPrototypeOf(obj);
} else {
p = obj.constructor ? obj.constructor.prototype : null;
}
// Circular refs possible? Let's guard against that.
let sentinel = 5;
while (p !== null && sentinel-- !== 0) {
ArrayPrototypePush(memberGroups, filteredOwnPropertyNames(p));
p = ObjectGetPrototypeOf(p);
}
} catch {
// Maybe a Proxy object without `getOwnPropertyNames` trap.
// We simply ignore it here, as we don't want to break the
// autocompletion. Fixes the bug
// https://github.com/nodejs/node/issues/2119
}
if (memberGroups.length) {
expr += chaining;
ArrayPrototypeForEach(memberGroups, (group) => {
ArrayPrototypePush(completionGroups,
ArrayPrototypeMap(group,
(member) => `${expr}${member}`));
});
if (filter) {
filter = `${expr}${filter}`;
}
}
completionGroupsLoaded();
});
return;
}
return completionGroupsLoaded();
// Will be called when all completionGroups are in place
// Useful for async autocompletion
function completionGroupsLoaded() {
// Filter, sort (within each group), uniq and merge the completion groups.
if (completionGroups.length && filter) {
const newCompletionGroups = [];
const lowerCaseFilter = StringPrototypeToLocaleLowerCase(filter);
ArrayPrototypeForEach(completionGroups, (group) => {
const filteredGroup = ArrayPrototypeFilter(group, (str) => {
// Filter is always case-insensitive following chromium autocomplete
// behavior.
return StringPrototypeStartsWith(
StringPrototypeToLocaleLowerCase(str),
lowerCaseFilter,
);
});
if (filteredGroup.length) {
ArrayPrototypePush(newCompletionGroups, filteredGroup);
}
});
completionGroups = newCompletionGroups;
}
const completions = [];
// Unique completions across all groups.
const uniqueSet = new SafeSet();
uniqueSet.add('');
// Completion group 0 is the "closest" (least far up the inheritance
// chain) so we put its completions last: to be closest in the REPL.
ArrayPrototypeForEach(completionGroups, (group) => {
ArrayPrototypeSort(group, (a, b) => (b > a ? 1 : -1));
const setSize = uniqueSet.size;
ArrayPrototypeForEach(group, (entry) => {
if (!uniqueSet.has(entry)) {
ArrayPrototypeUnshift(completions, entry);
uniqueSet.add(entry);
}
});
// Add a separator between groups.
if (uniqueSet.size !== setSize) {
ArrayPrototypeUnshift(completions, '');
}
});
// Remove obsolete group entry, if present.
if (completions[0] === '') {
ArrayPrototypeShift(completions);
}
callback(null, [completions, completeOn]);
}
}
REPLServer.prototype.completeOnEditorMode = (callback) => (err, results) => {
if (err) return callback(err);
const { 0: completions, 1: completeOn = '' } = results;
let result = ArrayPrototypeFilter(completions, Boolean);
if (completeOn && result.length !== 0) {
result = [commonPrefix(result)];
}
callback(null, [result, completeOn]);
};
REPLServer.prototype.defineCommand = function(keyword, cmd) {
if (typeof cmd === 'function') {
cmd = { action: cmd };
} else {
validateFunction(cmd.action, 'cmd.action');
}
this.commands[keyword] = cmd;
};
// TODO(BridgeAR): This should be replaced with acorn to build an AST. The
// language became more complex and using a simple approach like this is not
// sufficient anymore.
function _memory(cmd) {
const self = this;
self.lines = self.lines || [];
self.lines.level = self.lines.level || [];
// Save the line so I can do magic later
if (cmd) {
const len = self.lines.level.length ? self.lines.level.length - 1 : 0;
ArrayPrototypePush(self.lines, StringPrototypeRepeat(' ', len) + cmd);
} else {
// I don't want to not change the format too much...
ArrayPrototypePush(self.lines, '');
}
if (!cmd) {
self.lines.level = [];
return;
}
// I need to know "depth."
// Because I can not tell the difference between a } that
// closes an object literal and a } that closes a function
const countMatches = (regex, str) => {
let count = 0;
while (RegExpPrototypeExec(regex, str) !== null) count++;
return count;
};
// Going down is { and ( e.g. function() {
// going up is } and )
const dw = countMatches(/[{(]/g, cmd);
const up = countMatches(/[})]/g, cmd);
let depth = dw.length - up.length;
if (depth) {
(function workIt() {
if (depth > 0) {
// Going... down.
// Push the line#, depth count, and if the line is a function.
// Since JS only has functional scope I only need to remove
// "function() {" lines, clearly this will not work for
// "function()
// {" but nothing should break, only tab completion for local
// scope will not work for this function.
ArrayPrototypePush(self.lines.level, {
line: self.lines.length - 1,
depth: depth,
});
} else if (depth < 0) {
// Going... up.
const curr = ArrayPrototypePop(self.lines.level);
if (curr) {
const tmp = curr.depth + depth;
if (tmp < 0) {
// More to go, recurse
depth += curr.depth;
workIt();
} else if (tmp > 0) {
// Remove and push back
curr.depth += depth;
ArrayPrototypePush(self.lines.level, curr);
}
}
}
}());
}
}
function addCommonWords(completionGroups) {
// Only words which do not yet exist as global property should be added to
// this list.
ArrayPrototypePush(completionGroups, [
'async', 'await', 'break', 'case', 'catch', 'const', 'continue',
'debugger', 'default', 'delete', 'do', 'else', 'export', 'false',
'finally', 'for', 'function', 'if', 'import', 'in', 'instanceof', 'let',
'new', 'null', 'return', 'switch', 'this', 'throw', 'true', 'try',
'typeof', 'var', 'void', 'while', 'with', 'yield',
]);
}
function _turnOnEditorMode(repl) {
repl.editorMode = true;
ReflectApply(Interface.prototype.setPrompt, repl, ['']);
}
function _turnOffEditorMode(repl) {
repl.editorMode = false;
repl.setPrompt(repl._initialPrompt);
}
function defineDefaultCommands(repl) {
repl.defineCommand('break', {
help: 'Sometimes you get stuck, this gets you out',
action: function() {
this.clearBufferedCommand();
this.displayPrompt();
},
});
let clearMessage;
if (repl.useGlobal) {
clearMessage = 'Alias for .break';
} else {
clearMessage = 'Break, and also clear the local context';
}
repl.defineCommand('clear', {
help: clearMessage,
action: function() {
this.clearBufferedCommand();
if (!this.useGlobal) {
this.output.write('Clearing context...\n');
this.resetContext();
}
this.displayPrompt();
},
});
repl.defineCommand('exit', {
help: 'Exit the REPL',
action: function() {
this.close();
},
});
repl.defineCommand('help', {
help: 'Print this help message',
action: function() {
const names = ArrayPrototypeSort(ObjectKeys(this.commands));
const longestNameLength = MathMaxApply(
ArrayPrototypeMap(names, (name) => name.length),
);
ArrayPrototypeForEach(names, (name) => {
const cmd = this.commands[name];
const spaces =
StringPrototypeRepeat(' ', longestNameLength - name.length + 3);
const line = `.${name}${cmd.help ? spaces + cmd.help : ''}\n`;
this.output.write(line);
});
this.output.write('\nPress Ctrl+C to abort current expression, ' +
'Ctrl+D to exit the REPL\n');
this.displayPrompt();
},
});
repl.defineCommand('save', {
help: 'Save all evaluated commands in this REPL session to a file',
action: function(file) {
try {
if (file === '') {
throw new ERR_MISSING_ARGS('file');
}
fs.writeFileSync(file, ArrayPrototypeJoin(this.lines, '\n'));
this.output.write(`Session saved to: ${file}\n`);
} catch (error) {
if (error instanceof ERR_MISSING_ARGS) {
this.output.write(`${error.message}\n`);
} else {
this.output.write(`Failed to save: ${file}\n`);
}
}
this.displayPrompt();
},
});
repl.defineCommand('load', {
help: 'Load JS from a file into the REPL session',
action: function(file) {
try {
if (file === '') {
throw new ERR_MISSING_ARGS('file');
}
const stats = fs.statSync(file);
if (stats && stats.isFile()) {
_turnOnEditorMode(this);
this[kLoadingSymbol] = true;
const data = fs.readFileSync(file, 'utf8');
this.write(data);
this[kLoadingSymbol] = false;
_turnOffEditorMode(this);
this.write('\n');
} else {
this.output.write(
`Failed to load: ${file} is not a valid file\n`,
);
}
} catch (error) {
if (error instanceof ERR_MISSING_ARGS) {
this.output.write(`${error.message}\n`);
} else {
this.output.write(`Failed to load: ${file}\n`);
}
}
this.displayPrompt();
},
});
if (repl.terminal) {
repl.defineCommand('editor', {
help: 'Enter editor mode',
action() {
_turnOnEditorMode(this);
this.output.write(
'// Entering editor mode (Ctrl+D to finish, Ctrl+C to cancel)\n');
},
});
}
}
function Recoverable(err) {
this.err = err;
}
ObjectSetPrototypeOf(Recoverable.prototype, SyntaxErrorPrototype);
ObjectSetPrototypeOf(Recoverable, SyntaxError);
module.exports = {
start,
writer,
REPLServer,
REPL_MODE_SLOPPY,
REPL_MODE_STRICT,
Recoverable,
};
ObjectDefineProperty(module.exports, 'builtinModules', {
__proto__: null,
get: () => _builtinLibs,
set: (val) => _builtinLibs = val,
enumerable: true,
configurable: true,
});
ObjectDefineProperty(module.exports, '_builtinLibs', {
__proto__: null,
get: pendingDeprecation ? deprecate(
() => _builtinLibs,
'repl._builtinLibs is deprecated. Check module.builtinModules instead',
'DEP0142',
) : () => _builtinLibs,
set: pendingDeprecation ? deprecate(
(val) => _builtinLibs = val,
'repl._builtinLibs is deprecated. Check module.builtinModules instead',
'DEP0142',
) : (val) => _builtinLibs = val,
enumerable: false,
configurable: true,
});
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