// 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.

'use strict';

const uv = process.binding('uv');

const Buffer = require('buffer').Buffer;

const internalUtil = require('internal/util');

const binding = process.binding('util');

const errors = require('internal/errors');

const isError = internalUtil.isError;

const inspectDefaultOptions = Object.seal({

showHidden: false,

depth: 2,

colors: false,

customInspect: true,

showProxy: false,

maxArrayLength: 100,

breakLength: 60

});

var CIRCULAR_ERROR_MESSAGE;

var Debug;

function tryStringify(arg) {

try {

return JSON.stringify(arg);

} catch (err) {

// Populate the circular error message lazily

if (!CIRCULAR_ERROR_MESSAGE) {

try {

const a = {}; a.a = a; JSON.stringify(a);

} catch (err) {

CIRCULAR_ERROR_MESSAGE = err.message;

}

}

if (err.name === 'TypeError' && err.message === CIRCULAR_ERROR_MESSAGE)

return '[Circular]';

throw err;

}

}

exports.format = function(f) {

if (typeof f !== 'string') {

const objects = new Array(arguments.length);

for (var index = 0; index < arguments.length; index++) {

objects[index] = inspect(arguments[index]);

}

return objects.join(' ');

}

if (arguments.length === 1) return f;

var str = '';

var a = 1;

var lastPos = 0;

for (var i = 0; i < f.length;) {

if (f.charCodeAt(i) === 37/*'%'*/ && i + 1 < f.length) {

if (f.charCodeAt(i + 1) !== 37/*'%'*/ && a >= arguments.length) {

++i;

continue;

}

switch (f.charCodeAt(i + 1)) {

case 100: // 'd'

if (lastPos < i)

str += f.slice(lastPos, i);

str += Number(arguments[a++]);

break;

case 105: // 'i'

if (lastPos < i)

str += f.slice(lastPos, i);

str += parseInt(arguments[a++]);

break;

case 102: // 'f'

if (lastPos < i)

str += f.slice(lastPos, i);

str += parseFloat(arguments[a++]);

break;

case 106: // 'j'

if (lastPos < i)

str += f.slice(lastPos, i);

str += tryStringify(arguments[a++]);

break;

case 115: // 's'

if (lastPos < i)

str += f.slice(lastPos, i);

str += String(arguments[a++]);

break;

case 37: // '%'

if (lastPos < i)

str += f.slice(lastPos, i);

str += '%';

break;

}

lastPos = i = i + 2;

continue;

}

++i;

}

if (lastPos === 0)

str = f;

else if (lastPos < f.length)

str += f.slice(lastPos);

while (a < arguments.length) {

const x = arguments[a++];

if (x === null || (typeof x !== 'object' && typeof x !== 'symbol')) {

str += ' ' + x;

} else {

str += ' ' + inspect(x);

}

}

return str;

};

exports.deprecate = internalUtil.deprecate;

var debugs = {};

var debugEnviron;

exports.debuglog = function(set) {

if (debugEnviron === undefined)

debugEnviron = process.env.NODE_DEBUG || '';

set = set.toUpperCase();

if (!debugs[set]) {

if (new RegExp(`\\b${set}\\b`, 'i').test(debugEnviron)) {

var pid = process.pid;

debugs[set] = function() {

var msg = exports.format.apply(exports, arguments);

console.error('%s %d: %s', set, pid, msg);

};

} else {

debugs[set] = function() {};

}

}

return debugs[set];

};

/**

* Echos the value of a value. Tries to print the value out

* in the best way possible given the different types.

*

* @param {Object} obj The object to print out.

* @param {Object} opts Optional options object that alters the output.

*/

/* legacy: obj, showHidden, depth, colors*/

function inspect(obj, opts) {

// default options

var ctx = {

seen: [],

stylize: stylizeNoColor

};

// legacy...

if (arguments.length >= 3 && arguments[2] !== undefined) {

ctx.depth = arguments[2];

}

if (arguments.length >= 4 && arguments[3] !== undefined) {

ctx.colors = arguments[3];

}

if (typeof opts === 'boolean') {

// legacy...

ctx.showHidden = opts;

}

// Set default and user-specified options

ctx = Object.assign({}, inspect.defaultOptions, ctx, opts);

if (ctx.colors) ctx.stylize = stylizeWithColor;

if (ctx.maxArrayLength === null) ctx.maxArrayLength = Infinity;

return formatValue(ctx, obj, ctx.depth);

}

Object.defineProperty(inspect, 'defaultOptions', {

get: function() {

return inspectDefaultOptions;

},

set: function(options) {

if (options === null || typeof options !== 'object') {

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'options', 'object');

}

Object.assign(inspectDefaultOptions, options);

return inspectDefaultOptions;

}

});

// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics

inspect.colors = Object.assign(Object.create(null), {

'bold': [1, 22],

'italic': [3, 23],

'underline': [4, 24],

'inverse': [7, 27],

'white': [37, 39],

'grey': [90, 39],

'black': [30, 39],

'blue': [34, 39],

'cyan': [36, 39],

'green': [32, 39],

'magenta': [35, 39],

'red': [31, 39],

'yellow': [33, 39]

});

// Don't use 'blue' not visible on cmd.exe

inspect.styles = Object.assign(Object.create(null), {

'special': 'cyan',

'number': 'yellow',

'boolean': 'yellow',

'undefined': 'grey',

'null': 'bold',

'string': 'green',

'symbol': 'green',

'date': 'magenta',

// "name": intentionally not styling

'regexp': 'red'

});

const customInspectSymbol = internalUtil.customInspectSymbol;

exports.inspect = inspect;

exports.inspect.custom = customInspectSymbol;

function stylizeWithColor(str, styleType) {

var style = inspect.styles[styleType];

if (style) {

return `\u001b[${inspect.colors[style][0]}m${str}` +

`\u001b[${inspect.colors[style][1]}m`;

} else {

return str;

}

}

function stylizeNoColor(str, styleType) {

return str;

}

function arrayToHash(array) {

var hash = Object.create(null);

for (var i = 0; i < array.length; i++) {

var val = array[i];

hash[val] = true;

}

return hash;

}

function ensureDebugIsInitialized() {

if (Debug === undefined) {

const runInDebugContext = require('vm').runInDebugContext;

Debug = runInDebugContext('Debug');

}

}

function formatValue(ctx, value, recurseTimes) {

if (ctx.showProxy &&

((typeof value === 'object' && value !== null) ||

typeof value === 'function')) {

var proxy = undefined;

var proxyCache = ctx.proxyCache;

if (!proxyCache)

proxyCache = ctx.proxyCache = new Map();

// Determine if we've already seen this object and have

// determined that it either is or is not a proxy.

if (proxyCache.has(value)) {

// We've seen it, if the value is not undefined, it's a Proxy.

proxy = proxyCache.get(value);

} else {

// Haven't seen it. Need to check.

// If it's not a Proxy, this will return undefined.

// Otherwise, it'll return an array. The first item

// is the target, the second item is the handler.

// We ignore (and do not return) the Proxy isRevoked property.

proxy = binding.getProxyDetails(value);

if (proxy) {

// We know for a fact that this isn't a Proxy.

// Mark it as having already been evaluated.

// We do this because this object is passed

// recursively to formatValue below in order

// for it to get proper formatting, and because

// the target and handle objects also might be

// proxies... it's unfortunate but necessary.

proxyCache.set(proxy, undefined);

}

// If the object is not a Proxy, then this stores undefined.

// This tells the code above that we've already checked and

// ruled it out. If the object is a proxy, this caches the

// results of the getProxyDetails call.

proxyCache.set(value, proxy);

}

if (proxy) {

return 'Proxy ' + formatValue(ctx, proxy, recurseTimes);

}

}

// Provide a hook for user-specified inspect functions.

// Check that value is an object with an inspect function on it

if (ctx.customInspect && value) {

const maybeCustomInspect = value[customInspectSymbol] || value.inspect;

if (typeof maybeCustomInspect === 'function' &&

// Filter out the util module, its inspect function is special

maybeCustomInspect !== exports.inspect &&

// Also filter out any prototype objects using the circular check.

!(value.constructor && value.constructor.prototype === value)) {

let ret = maybeCustomInspect.call(value, recurseTimes, ctx);

// If the custom inspection method returned `this`, don't go into

// infinite recursion.

if (ret !== value) {

if (typeof ret !== 'string') {

ret = formatValue(ctx, ret, recurseTimes);

}

return ret;

}

}

}

// Primitive types cannot have properties

var primitive = formatPrimitive(ctx, value);

if (primitive) {

return primitive;

}

// Look up the keys of the object.

var keys = Object.keys(value);

var visibleKeys = arrayToHash(keys);

const symbolKeys = Object.getOwnPropertySymbols(value);

const enumSymbolKeys = symbolKeys

.filter((key) => Object.prototype.propertyIsEnumerable.call(value, key));

keys = keys.concat(enumSymbolKeys);

if (ctx.showHidden) {

keys = Object.getOwnPropertyNames(value).concat(symbolKeys);

}

// This could be a boxed primitive (new String(), etc.), check valueOf()

// NOTE: Avoid calling `valueOf` on `Date` instance because it will return

// a number which, when object has some additional user-stored `keys`,

// will be printed out.

var formatted;

var raw = value;

try {

// the .valueOf() call can fail for a multitude of reasons

if (!isDate(value))

raw = value.valueOf();

} catch (e) {

// ignore...

}

if (typeof raw === 'string') {

// for boxed Strings, we have to remove the 0-n indexed entries,

// since they just noisy up the output and are redundant

keys = keys.filter(function(key) {

if (typeof key === 'symbol') {

return true;

}

return !(key >= 0 && key < raw.length);

});

}

var constructor = internalUtil.getConstructorOf(value);

// Some type of object without properties can be shortcutted.

if (keys.length === 0) {

if (typeof value === 'function') {

const ctorName = constructor ? constructor.name : 'Function';

return ctx.stylize(

`[${ctorName}${value.name ? `: ${value.name}` : ''}]`, 'special');

}

if (isRegExp(value)) {

return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');

}

if (isDate(value)) {

if (Number.isNaN(value.getTime())) {

return ctx.stylize(value.toString(), 'date');

} else {

return ctx.stylize(Date.prototype.toISOString.call(value), 'date');

}

}

if (isError(value)) {

return formatError(value);

}

// now check the `raw` value to handle boxed primitives

if (typeof raw === 'string') {

formatted = formatPrimitiveNoColor(ctx, raw);

return ctx.stylize(`[String: ${formatted}]`, 'string');

}

if (typeof raw === 'symbol') {

formatted = formatPrimitiveNoColor(ctx, raw);

return ctx.stylize(`[Symbol: ${formatted}]`, 'symbol');

}

if (typeof raw === 'number') {

formatted = formatPrimitiveNoColor(ctx, raw);

return ctx.stylize(`[Number: ${formatted}]`, 'number');

}

if (typeof raw === 'boolean') {

formatted = formatPrimitiveNoColor(ctx, raw);

return ctx.stylize(`[Boolean: ${formatted}]`, 'boolean');

}

// Fast path for ArrayBuffer and SharedArrayBuffer.

// Can't do the same for DataView because it has a non-primitive

// .buffer property that we need to recurse for.

if (binding.isAnyArrayBuffer(value)) {

return `${constructor.name}` +

` { byteLength: ${formatNumber(ctx, value.byteLength)} }`;

}

if (binding.isExternal(value)) {

return ctx.stylize('[External]', 'special');

}

}

var base = '';

var empty = false;

var formatter = formatObject;

var braces;

// We can't compare constructors for various objects using a comparison like

// `constructor === Array` because the object could have come from a different

// context and thus the constructor won't match. Instead we check the

// constructor names (including those up the prototype chain where needed) to

// determine object types.

if (Array.isArray(value)) {

// Unset the constructor to prevent "Array [...]" for ordinary arrays.

if (constructor && constructor.name === 'Array')

constructor = null;

braces = ['[', ']'];

empty = value.length === 0;

formatter = formatArray;

} else if (binding.isSet(value)) {

braces = ['{', '}'];

// With `showHidden`, `length` will display as a hidden property for

// arrays. For consistency's sake, do the same for `size`, even though this

// property isn't selected by Object.getOwnPropertyNames().

if (ctx.showHidden)

keys.unshift('size');

empty = value.size === 0;

formatter = formatSet;

} else if (binding.isMap(value)) {

braces = ['{', '}'];

// Ditto.

if (ctx.showHidden)

keys.unshift('size');

empty = value.size === 0;

formatter = formatMap;

} else if (binding.isAnyArrayBuffer(value)) {

braces = ['{', '}'];

keys.unshift('byteLength');

visibleKeys.byteLength = true;

} else if (binding.isDataView(value)) {

braces = ['{', '}'];

// .buffer goes last, it's not a primitive like the others.

keys.unshift('byteLength', 'byteOffset', 'buffer');

visibleKeys.byteLength = true;

visibleKeys.byteOffset = true;

visibleKeys.buffer = true;

} else if (binding.isTypedArray(value)) {

braces = ['[', ']'];

formatter = formatTypedArray;

if (ctx.showHidden) {

// .buffer goes last, it's not a primitive like the others.

keys.unshift('BYTES_PER_ELEMENT',

'length',

'byteLength',

'byteOffset',

'buffer');

}

} else if (binding.isPromise(value)) {

braces = ['{', '}'];

formatter = formatPromise;

} else if (binding.isMapIterator(value)) {

constructor = { name: 'MapIterator' };

braces = ['{', '}'];

empty = false;

formatter = formatCollectionIterator;

} else if (binding.isSetIterator(value)) {

constructor = { name: 'SetIterator' };

braces = ['{', '}'];

empty = false;

formatter = formatCollectionIterator;

} else {

// Unset the constructor to prevent "Object {...}" for ordinary objects.

if (constructor && constructor.name === 'Object')

constructor = null;

braces = ['{', '}'];

empty = true; // No other data than keys.

}

empty = empty === true && keys.length === 0;

// Make functions say that they are functions

if (typeof value === 'function') {

const ctorName = constructor ? constructor.name : 'Function';

base = ` [${ctorName}${value.name ? `: ${value.name}` : ''}]`;

}

// Make RegExps say that they are RegExps

if (isRegExp(value)) {

base = ' ' + RegExp.prototype.toString.call(value);

}

// Make dates with properties first say the date

if (isDate(value)) {

base = ' ' + Date.prototype.toISOString.call(value);

}

// Make error with message first say the error

if (isError(value)) {

base = ' ' + formatError(value);

}

// Make boxed primitive Strings look like such

if (typeof raw === 'string') {

formatted = formatPrimitiveNoColor(ctx, raw);

base = ` [String: ${formatted}]`;

}

// Make boxed primitive Numbers look like such

if (typeof raw === 'number') {

formatted = formatPrimitiveNoColor(ctx, raw);

base = ` [Number: ${formatted}]`;

}

// Make boxed primitive Booleans look like such

if (typeof raw === 'boolean') {

formatted = formatPrimitiveNoColor(ctx, raw);

base = ` [Boolean: ${formatted}]`;

}

// Add constructor name if available

if (base === '' && constructor)

braces[0] = `${constructor.name} ${braces[0]}`;

if (empty === true) {

return braces[0] + base + braces[1];

}

if (recurseTimes < 0) {

if (isRegExp(value)) {

return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');

} else if (Array.isArray(value)) {

return ctx.stylize('[Array]', 'special');

} else {

return ctx.stylize('[Object]', 'special');

}

}

ctx.seen.push(value);

var output = formatter(ctx, value, recurseTimes, visibleKeys, keys);

ctx.seen.pop();

return reduceToSingleString(output, base, braces, ctx.breakLength);

}

function formatNumber(ctx, value) {

// Format -0 as '-0'. Strict equality won't distinguish 0 from -0.

if (Object.is(value, -0))

return ctx.stylize('-0', 'number');

return ctx.stylize('' + value, 'number');

}

function formatPrimitive(ctx, value) {

if (value === undefined)

return ctx.stylize('undefined', 'undefined');

// For some reason typeof null is "object", so special case here.

if (value === null)

return ctx.stylize('null', 'null');

var type = typeof value;

if (type === 'string') {

var simple = '\'' +

JSON.stringify(value)

.replace(/^"|"$/g, '')

.replace(/'/g, "\\'")

.replace(/\\"/g, '"') +

'\'';

return ctx.stylize(simple, 'string');

}

if (type === 'number')

return formatNumber(ctx, value);

if (type === 'boolean')

return ctx.stylize('' + value, 'boolean');

// es6 symbol primitive

if (type === 'symbol')

return ctx.stylize(value.toString(), 'symbol');

}

function formatPrimitiveNoColor(ctx, value) {

var stylize = ctx.stylize;

ctx.stylize = stylizeNoColor;

var str = formatPrimitive(ctx, value);

ctx.stylize = stylize;

return str;

}

function formatError(value) {

return value.stack || `[${Error.prototype.toString.call(value)}]`;

}

function formatObject(ctx, value, recurseTimes, visibleKeys, keys) {

return keys.map(function(key) {

return formatProperty(ctx, value, recurseTimes, visibleKeys, key, false);

});

}

function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {

var output = [];

let visibleLength = 0;

let index = 0;

while (index < value.length && visibleLength < ctx.maxArrayLength) {

let emptyItems = 0;

while (index < value.length && !hasOwnProperty(value, String(index))) {

emptyItems++;

index++;

}

if (emptyItems > 0) {

const ending = emptyItems > 1 ? 's' : '';

const message = `<${emptyItems} empty item${ending}>`;

output.push(ctx.stylize(message, 'undefined'));

} else {

output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,

String(index), true));

index++;

}

visibleLength++;

}

var remaining = value.length - index;

if (remaining > 0) {

output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);

}

for (var n = 0; n < keys.length; n++) {

var key = keys[n];

if (typeof key === 'symbol' || !key.match(/^\d+$/)) {

output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,

key, true));

}

}

return output;

}

function formatTypedArray(ctx, value, recurseTimes, visibleKeys, keys) {

const maxLength = Math.min(Math.max(0, ctx.maxArrayLength), value.length);

const remaining = value.length - maxLength;

var output = new Array(maxLength);

for (var i = 0; i < maxLength; ++i)

output[i] = formatNumber(ctx, value[i]);

if (remaining > 0) {

output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);

}

for (const key of keys) {

if (typeof key === 'symbol' || !key.match(/^\d+$/)) {

output.push(

formatProperty(ctx, value, recurseTimes, visibleKeys, key, true));

}

}

return output;

}

function formatSet(ctx, value, recurseTimes, visibleKeys, keys) {

var output = [];

value.forEach(function(v) {

var nextRecurseTimes = recurseTimes === null ? null : recurseTimes - 1;

var str = formatValue(ctx, v, nextRecurseTimes);

output.push(str);

});

for (var n = 0; n < keys.length; n++) {

output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,

keys[n], false));

}

return output;

}

function formatMap(ctx, value, recurseTimes, visibleKeys, keys) {

var output = [];

value.forEach(function(v, k) {

var nextRecurseTimes = recurseTimes === null ? null : recurseTimes - 1;

var str = formatValue(ctx, k, nextRecurseTimes);

str += ' => ';

str += formatValue(ctx, v, nextRecurseTimes);

output.push(str);

});

for (var n = 0; n < keys.length; n++) {

output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,

keys[n], false));

}

return output;

}

function formatCollectionIterator(ctx, value, recurseTimes, visibleKeys, keys) {

ensureDebugIsInitialized();

const mirror = Debug.MakeMirror(value, true);

var nextRecurseTimes = recurseTimes === null ? null : recurseTimes - 1;

var vals = mirror.preview();

var output = [];

for (const o of vals) {

output.push(formatValue(ctx, o, nextRecurseTimes));

}

return output;

}

function formatPromise(ctx, value, recurseTimes, visibleKeys, keys) {

const output = [];

const [state, result] = binding.getPromiseDetails(value);

if (state === binding.kPending) {

output.push('<pending>');

} else {

var nextRecurseTimes = recurseTimes === null ? null : recurseTimes - 1;

var str = formatValue(ctx, result, nextRecurseTimes);

if (state === binding.kRejected) {

output.push('<rejected> ' + str);

} else {

output.push(str);

}

}

for (var n = 0; n < keys.length; n++) {

output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,

keys[n], false));

}

return output;

}

function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {

var name, str, desc;

desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };

if (desc.get) {

if (desc.set) {

str = ctx.stylize('[Getter/Setter]', 'special');

} else {

str = ctx.stylize('[Getter]', 'special');

}

} else {

if (desc.set) {

str = ctx.stylize('[Setter]', 'special');

}

}

if (!hasOwnProperty(visibleKeys, key)) {

if (typeof key === 'symbol') {

name = `[${ctx.stylize(key.toString(), 'symbol')}]`;

} else {

name = `[${key}]`;

}

}

if (!str) {

if (ctx.seen.indexOf(desc.value) < 0) {

if (recurseTimes === null) {

str = formatValue(ctx, desc.value, null);

} else {

str = formatValue(ctx, desc.value, recurseTimes - 1);

}

if (str.indexOf('\n') > -1) {

if (array) {

str = str.replace(/\n/g, '\n ');

} else {

str = str.replace(/(^|\n)/g, '\n ');

}

}

} else {

str = ctx.stylize('[Circular]', 'special');

}

}

if (name === undefined) {

if (array && key.match(/^\d+$/)) {

return str;

}

name = JSON.stringify('' + key);

if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {

name = name.substr(1, name.length - 2);

name = ctx.stylize(name, 'name');

} else {

name = name.replace(/'/g, "\\'")

.replace(/\\"/g, '"')

.replace(/(^"|"$)/g, "'")

.replace(/\\\\/g, '\\');

name = ctx.stylize(name, 'string');

}

}

return `${name}: ${str}`;

}

function reduceToSingleString(output, base, braces, breakLength) {

var length = output.reduce(function(prev, cur) {

return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;

}, 0);

if (length > breakLength) {

return braces[0] +

// If the opening "brace" is too large, like in the case of "Set {",

// we need to force the first item to be on the next line or the

// items will not line up correctly.

(base === '' && braces[0].length === 1 ? '' : base + '\n ') +

` ${output.join(',\n ')} ${braces[1]}`;

}

return `${braces[0]}${base} ${output.join(', ')} ${braces[1]}`;

}

// NOTE: These type checking functions intentionally don't use `instanceof`

// because it is fragile and can be easily faked with `Object.create()`.

exports.isArray = Array.isArray;

function isBoolean(arg) {

return typeof arg === 'boolean';

}

exports.isBoolean = isBoolean;

function isNull(arg) {

return arg === null;

}

exports.isNull = isNull;

function isNullOrUndefined(arg) {

return arg === null || arg === undefined;

}

exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {

return typeof arg === 'number';

}

exports.isNumber = isNumber;

function isString(arg) {

return typeof arg === 'string';

}

exports.isString = isString;

function isSymbol(arg) {

return typeof arg === 'symbol';

}

exports.isSymbol = isSymbol;

function isUndefined(arg) {

return arg === undefined;

}

exports.isUndefined = isUndefined;

function isRegExp(re) {

return binding.isRegExp(re);

}

exports.isRegExp = isRegExp;

function isObject(arg) {

return arg !== null && typeof arg === 'object';

}

exports.isObject = isObject;

function isDate(d) {

return binding.isDate(d);

}

exports.isDate = isDate;

exports.isError = isError;

function isFunction(arg) {

return typeof arg === 'function';

}

exports.isFunction = isFunction;

function isPrimitive(arg) {

return arg === null ||

typeof arg !== 'object' && typeof arg !== 'function';

}

exports.isPrimitive = isPrimitive;

exports.isBuffer = Buffer.isBuffer;

function pad(n) {

return n < 10 ? '0' + n.toString(10) : n.toString(10);

}

const months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',

'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34

function timestamp() {

var d = new Date();

var time = [pad(d.getHours()),

pad(d.getMinutes()),

pad(d.getSeconds())].join(':');

return [d.getDate(), months[d.getMonth()], time].join(' ');

}

// log is just a thin wrapper to console.log that prepends a timestamp

exports.log = function() {

console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));

};

/**

* Inherit the prototype methods from one constructor into another.

*

* The Function.prototype.inherits from lang.js rewritten as a standalone

* function (not on Function.prototype). NOTE: If this file is to be loaded

* during bootstrapping this function needs to be rewritten using some native

* functions as prototype setup using normal JavaScript does not work as

* expected during bootstrapping (see mirror.js in r114903).

*

* @param {function} ctor Constructor function which needs to inherit the

* prototype.

* @param {function} superCtor Constructor function to inherit prototype from.

* @throws {TypeError} Will error if either constructor is null, or if

* the super constructor lacks a prototype.

*/

exports.inherits = function(ctor, superCtor) {

if (ctor === undefined || ctor === null)

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'ctor', 'function');

if (superCtor === undefined || superCtor === null)

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'superCtor', 'function');

if (superCtor.prototype === undefined)

throw new errors.TypeError('ERR_INVALID_ARG_TYPE', 'superCtor.prototype',

'function');

ctor.super_ = superCtor;

Object.setPrototypeOf(ctor.prototype, superCtor.prototype);

};

exports._extend = function(target, source) {

// Don't do anything if source isn't an object

if (source === null || typeof source !== 'object') return target;

var keys = Object.keys(source);

var i = keys.length;

while (i--) {

target[keys[i]] = source[keys[i]];

}

return target;

};

function hasOwnProperty(obj, prop) {

return Object.prototype.hasOwnProperty.call(obj, prop);

}

// Deprecated old stuff.

exports.print = internalUtil.deprecate(function() {

for (var i = 0, len = arguments.length; i < len; ++i) {

process.stdout.write(String(arguments[i]));

}

}, 'util.print is deprecated. Use console.log instead.', 'DEP0026');

exports.puts = internalUtil.deprecate(function() {

for (var i = 0, len = arguments.length; i < len; ++i) {

process.stdout.write(arguments[i] + '\n');

}

}, 'util.puts is deprecated. Use console.log instead.', 'DEP0027');

exports.debug = internalUtil.deprecate(function(x) {

process.stderr.write(`DEBUG: ${x}\n`);

}, 'util.debug is deprecated. Use console.error instead.', 'DEP0028');

exports.error = internalUtil.deprecate(function(x) {