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util.js
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util.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.
'use strict';
const errors = require('internal/errors');
const {
ERR_FALSY_VALUE_REJECTION,
ERR_INVALID_ARG_TYPE,
ERR_OUT_OF_RANGE
} = errors.codes;
const { validateNumber } = require('internal/validators');
const { TextDecoder, TextEncoder } = require('internal/encoding');
const { isBuffer } = require('buffer').Buffer;
const { internalBinding } = require('internal/bootstrap/loaders');
const {
getOwnNonIndexProperties,
getPromiseDetails,
getProxyDetails,
kPending,
kRejected,
previewEntries,
propertyFilter: {
ALL_PROPERTIES,
ONLY_ENUMERABLE
}
} = internalBinding('util');
const types = internalBinding('types');
Object.assign(types, require('internal/util/types'));
const {
isAnyArrayBuffer,
isArrayBuffer,
isArgumentsObject,
isBoxedPrimitive,
isDataView,
isExternal,
isMap,
isMapIterator,
isPromise,
isSet,
isSetIterator,
isWeakMap,
isWeakSet,
isRegExp,
isDate,
isTypedArray,
isStringObject,
isNumberObject,
isBooleanObject,
isBigIntObject,
isUint8Array,
isUint8ClampedArray,
isUint16Array,
isUint32Array,
isInt8Array,
isInt16Array,
isInt32Array,
isFloat32Array,
isFloat64Array,
isBigInt64Array,
isBigUint64Array
} = types;
const {
customInspectSymbol,
deprecate,
getSystemErrorName: internalErrorName,
isError,
promisify,
join,
removeColors
} = require('internal/util');
const inspectDefaultOptions = Object.seal({
showHidden: false,
depth: 2,
colors: false,
customInspect: true,
showProxy: false,
maxArrayLength: 100,
breakLength: 60,
compact: true
});
const kObjectType = 0;
const kArrayType = 1;
const kArrayExtrasType = 2;
const ReflectApply = Reflect.apply;
// This function is borrowed from the function with the same name on V8 Extras'
// `utils` object. V8 implements Reflect.apply very efficiently in conjunction
// with the spread syntax, such that no additional special case is needed for
// function calls w/o arguments.
// Refs: https://github.com/v8/v8/blob/d6ead37d265d7215cf9c5f768f279e21bd170212/src/js/prologue.js#L152-L156
function uncurryThis(func) {
return (thisArg, ...args) => ReflectApply(func, thisArg, args);
}
const propertyIsEnumerable = uncurryThis(Object.prototype.propertyIsEnumerable);
const regExpToString = uncurryThis(RegExp.prototype.toString);
const dateToISOString = uncurryThis(Date.prototype.toISOString);
const errorToString = uncurryThis(Error.prototype.toString);
const bigIntValueOf = uncurryThis(BigInt.prototype.valueOf);
const booleanValueOf = uncurryThis(Boolean.prototype.valueOf);
const numberValueOf = uncurryThis(Number.prototype.valueOf);
const symbolValueOf = uncurryThis(Symbol.prototype.valueOf);
const stringValueOf = uncurryThis(String.prototype.valueOf);
const setValues = uncurryThis(Set.prototype.values);
const mapEntries = uncurryThis(Map.prototype.entries);
const dateGetTime = uncurryThis(Date.prototype.getTime);
const hasOwnProperty = uncurryThis(Object.prototype.hasOwnProperty);
let CIRCULAR_ERROR_MESSAGE;
let internalDeepEqual;
/* eslint-disable no-control-regex */
const strEscapeSequencesRegExp = /[\x00-\x1f\x27\x5c]/;
const strEscapeSequencesReplacer = /[\x00-\x1f\x27\x5c]/g;
const strEscapeSequencesRegExpSingle = /[\x00-\x1f\x5c]/;
const strEscapeSequencesReplacerSingle = /[\x00-\x1f\x5c]/g;
/* eslint-enable no-control-regex */
const keyStrRegExp = /^[a-zA-Z_][a-zA-Z_0-9]*$/;
const numberRegExp = /^(0|[1-9][0-9]*)$/;
const readableRegExps = {};
const MIN_LINE_LENGTH = 16;
// Escaped special characters. Use empty strings to fill up unused entries.
const meta = [
'\\u0000', '\\u0001', '\\u0002', '\\u0003', '\\u0004',
'\\u0005', '\\u0006', '\\u0007', '\\b', '\\t',
'\\n', '\\u000b', '\\f', '\\r', '\\u000e',
'\\u000f', '\\u0010', '\\u0011', '\\u0012', '\\u0013',
'\\u0014', '\\u0015', '\\u0016', '\\u0017', '\\u0018',
'\\u0019', '\\u001a', '\\u001b', '\\u001c', '\\u001d',
'\\u001e', '\\u001f', '', '', '',
'', '', '', '', "\\'", '', '', '', '', '',
'', '', '', '', '', '', '', '', '', '',
'', '', '', '', '', '', '', '', '', '',
'', '', '', '', '', '', '', '', '', '',
'', '', '', '', '', '', '', '', '', '',
'', '', '', '', '', '', '', '\\\\'
];
// Constants to map the iterator state.
const kWeak = 0;
const kIterator = 1;
const kMapEntries = 2;
function addQuotes(str, quotes) {
if (quotes === -1) {
return `"${str}"`;
}
if (quotes === -2) {
return `\`${str}\``;
}
return `'${str}'`;
}
const escapeFn = (str) => meta[str.charCodeAt(0)];
// Escape control characters, single quotes and the backslash.
// This is similar to JSON stringify escaping.
function strEscape(str) {
let escapeTest = strEscapeSequencesRegExp;
let escapeReplace = strEscapeSequencesReplacer;
let singleQuote = 39;
// Check for double quotes. If not present, do not escape single quotes and
// instead wrap the text in double quotes. If double quotes exist, check for
// backticks. If they do not exist, use those as fallback instead of the
// double quotes.
if (str.indexOf("'") !== -1) {
// This invalidates the charCode and therefore can not be matched for
// anymore.
if (str.indexOf('"') === -1) {
singleQuote = -1;
} else if (str.indexOf('`') === -1 && str.indexOf('${') === -1) {
singleQuote = -2;
}
if (singleQuote !== 39) {
escapeTest = strEscapeSequencesRegExpSingle;
escapeReplace = strEscapeSequencesReplacerSingle;
}
}
// Some magic numbers that worked out fine while benchmarking with v8 6.0
if (str.length < 5000 && !escapeTest.test(str))
return addQuotes(str, singleQuote);
if (str.length > 100) {
str = str.replace(escapeReplace, escapeFn);
return addQuotes(str, singleQuote);
}
let result = '';
let last = 0;
for (var i = 0; i < str.length; i++) {
const point = str.charCodeAt(i);
if (point === singleQuote || point === 92 || point < 32) {
if (last === i) {
result += meta[point];
} else {
result += `${str.slice(last, i)}${meta[point]}`;
}
last = i + 1;
}
}
if (last === 0) {
result = str;
} else if (last !== i) {
result += str.slice(last);
}
return addQuotes(result, singleQuote);
}
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;
}
}
const emptyOptions = {};
function format(...args) {
return formatWithOptions(emptyOptions, ...args);
}
function formatWithOptions(inspectOptions, f) {
let i, tempStr;
if (typeof f !== 'string') {
if (arguments.length === 1) return '';
let res = '';
for (i = 1; i < arguments.length - 1; i++) {
res += inspect(arguments[i], inspectOptions);
res += ' ';
}
res += inspect(arguments[i], inspectOptions);
return res;
}
if (arguments.length === 2) return f;
let str = '';
let a = 2;
let lastPos = 0;
for (i = 0; i < f.length - 1; i++) {
if (f.charCodeAt(i) === 37) { // '%'
const nextChar = f.charCodeAt(++i);
if (a !== arguments.length) {
switch (nextChar) {
case 115: // 's'
tempStr = String(arguments[a++]);
break;
case 106: // 'j'
tempStr = tryStringify(arguments[a++]);
break;
case 100: // 'd'
tempStr = `${Number(arguments[a++])}`;
break;
case 79: // 'O'
tempStr = inspect(arguments[a++], inspectOptions);
break;
case 111: // 'o'
{
const opts = Object.assign({}, inspectOptions, {
showHidden: true,
showProxy: true,
depth: 4
});
tempStr = inspect(arguments[a++], opts);
break;
}
case 105: // 'i'
tempStr = `${parseInt(arguments[a++])}`;
break;
case 102: // 'f'
tempStr = `${parseFloat(arguments[a++])}`;
break;
case 37: // '%'
str += f.slice(lastPos, i);
lastPos = i + 1;
continue;
default: // any other character is not a correct placeholder
continue;
}
if (lastPos !== i - 1)
str += f.slice(lastPos, i - 1);
str += tempStr;
lastPos = i + 1;
} else if (nextChar === 37) {
str += f.slice(lastPos, i);
lastPos = i + 1;
}
}
}
if (lastPos === 0)
str = f;
else if (lastPos < f.length)
str += f.slice(lastPos);
while (a < arguments.length) {
const x = arguments[a++];
if ((typeof x !== 'object' && typeof x !== 'symbol') || x === null) {
str += ` ${x}`;
} else {
str += ` ${inspect(x, inspectOptions)}`;
}
}
return str;
}
const debugs = {};
let debugEnvRegex = /^$/;
if (process.env.NODE_DEBUG) {
let debugEnv = process.env.NODE_DEBUG;
debugEnv = debugEnv.replace(/[|\\{}()[\]^$+?.]/g, '\\$&')
.replace(/\*/g, '.*')
.replace(/,/g, '$|^')
.toUpperCase();
debugEnvRegex = new RegExp(`^${debugEnv}$`, 'i');
}
// Emits warning when user sets
// NODE_DEBUG=http or NODE_DEBUG=http2.
function emitWarningIfNeeded(set) {
if ('HTTP' === set || 'HTTP2' === set) {
process.emitWarning('Setting the NODE_DEBUG environment variable ' +
'to \'' + set.toLowerCase() + '\' can expose sensitive ' +
'data (such as passwords, tokens and authentication headers) ' +
'in the resulting log.');
}
}
function debuglog(set) {
set = set.toUpperCase();
if (!debugs[set]) {
if (debugEnvRegex.test(set)) {
const pid = process.pid;
emitWarningIfNeeded(set);
debugs[set] = function debug() {
const msg = exports.format.apply(exports, arguments);
console.error('%s %d: %s', set, pid, msg);
};
} else {
debugs[set] = function debug() {};
}
}
return debugs[set];
}
/**
* Echos the value of any input. Tries to print the value out
* in the best way possible given the different types.
*
* @param {any} value The value to print out.
* @param {Object} opts Optional options object that alters the output.
*/
/* Legacy: value, showHidden, depth, colors */
function inspect(value, opts) {
// Default options
const ctx = {
seen: [],
stylize: stylizeNoColor,
showHidden: inspectDefaultOptions.showHidden,
depth: inspectDefaultOptions.depth,
colors: inspectDefaultOptions.colors,
customInspect: inspectDefaultOptions.customInspect,
showProxy: inspectDefaultOptions.showProxy,
// TODO(BridgeAR): Deprecate `maxArrayLength` and replace it with
// `maxEntries`.
maxArrayLength: inspectDefaultOptions.maxArrayLength,
breakLength: inspectDefaultOptions.breakLength,
indentationLvl: 0,
compact: inspectDefaultOptions.compact,
budget: {}
};
if (arguments.length > 1) {
// Legacy...
if (arguments.length > 2) {
if (arguments[2] !== undefined) {
ctx.depth = arguments[2];
}
if (arguments.length > 3 && arguments[3] !== undefined) {
ctx.colors = arguments[3];
}
}
// Set user-specified options
if (typeof opts === 'boolean') {
ctx.showHidden = opts;
} else if (opts) {
const optKeys = Object.keys(opts);
for (var i = 0; i < optKeys.length; i++) {
ctx[optKeys[i]] = opts[optKeys[i]];
}
}
}
if (ctx.colors) ctx.stylize = stylizeWithColor;
if (ctx.maxArrayLength === null) ctx.maxArrayLength = Infinity;
return formatValue(ctx, value, ctx.depth);
}
inspect.custom = customInspectSymbol;
Object.defineProperty(inspect, 'defaultOptions', {
get() {
return inspectDefaultOptions;
},
set(options) {
if (options === null || typeof options !== 'object') {
throw new ERR_INVALID_ARG_TYPE('options', 'Object', options);
}
return _extend(inspectDefaultOptions, options);
}
});
// 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',
'bigint': 'yellow',
'boolean': 'yellow',
'undefined': 'grey',
'null': 'bold',
'string': 'green',
'symbol': 'green',
'date': 'magenta',
// "name": intentionally not styling
'regexp': 'red'
});
function stylizeWithColor(str, styleType) {
const style = inspect.styles[styleType];
if (style !== undefined) {
const color = inspect.colors[style];
return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
}
return str;
}
function stylizeNoColor(str) {
return str;
}
// Return a new empty array to push in the results of the default formatter.
function getEmptyFormatArray() {
return [];
}
function getConstructorName(obj) {
while (obj) {
const descriptor = Object.getOwnPropertyDescriptor(obj, 'constructor');
if (descriptor !== undefined &&
typeof descriptor.value === 'function' &&
descriptor.value.name !== '') {
return descriptor.value.name;
}
obj = Object.getPrototypeOf(obj);
}
return '';
}
function getPrefix(constructor, tag, fallback) {
if (constructor !== '') {
if (tag !== '' && constructor !== tag) {
return `${constructor} [${tag}] `;
}
return `${constructor} `;
}
if (tag !== '')
return `[${tag}] `;
if (fallback !== undefined)
return `${fallback} `;
return '';
}
const getBoxedValue = formatPrimitive.bind(null, stylizeNoColor);
// Look up the keys of the object.
function getKeys(value, showHidden) {
let keys;
const symbols = Object.getOwnPropertySymbols(value);
if (showHidden) {
keys = Object.getOwnPropertyNames(value);
if (symbols.length !== 0)
keys.push(...symbols);
} else {
// This might throw if `value` is a Module Namespace Object from an
// unevaluated module, but we don't want to perform the actual type
// check because it's expensive.
// TODO(devsnek): track https://github.com/tc39/ecma262/issues/1209
// and modify this logic as needed.
try {
keys = Object.keys(value);
} catch (err) {
if (types.isNativeError(err) &&
err.name === 'ReferenceError' &&
types.isModuleNamespaceObject(value)) {
keys = Object.getOwnPropertyNames(value);
} else {
throw err;
}
}
if (symbols.length !== 0) {
keys.push(...symbols.filter((key) => propertyIsEnumerable(value, key)));
}
}
return keys;
}
function formatProxy(ctx, proxy, recurseTimes) {
if (recurseTimes != null) {
if (recurseTimes < 0)
return ctx.stylize('Proxy [Array]', 'special');
recurseTimes -= 1;
}
ctx.indentationLvl += 2;
const res = [
formatValue(ctx, proxy[0], recurseTimes),
formatValue(ctx, proxy[1], recurseTimes)
];
ctx.indentationLvl -= 2;
const str = reduceToSingleString(ctx, res, '', ['[', ']']);
return `Proxy ${str}`;
}
function findTypedConstructor(value) {
for (const [check, clazz] of [
[isUint8Array, Uint8Array],
[isUint8ClampedArray, Uint8ClampedArray],
[isUint16Array, Uint16Array],
[isUint32Array, Uint32Array],
[isInt8Array, Int8Array],
[isInt16Array, Int16Array],
[isInt32Array, Int32Array],
[isFloat32Array, Float32Array],
[isFloat64Array, Float64Array],
[isBigInt64Array, BigInt64Array],
[isBigUint64Array, BigUint64Array]
]) {
if (check(value)) {
return clazz;
}
}
}
function noPrototypeIterator(ctx, value, recurseTimes) {
let newVal;
// TODO: Create a Subclass in case there's no prototype and show
// `null-prototype`.
if (isSet(value)) {
const clazz = Object.getPrototypeOf(value) || Set;
newVal = new clazz(setValues(value));
} else if (isMap(value)) {
const clazz = Object.getPrototypeOf(value) || Map;
newVal = new clazz(mapEntries(value));
} else if (Array.isArray(value)) {
const clazz = Object.getPrototypeOf(value) || Array;
newVal = new clazz(value.length || 0);
} else if (isTypedArray(value)) {
const clazz = findTypedConstructor(value) || Uint8Array;
newVal = new clazz(value);
}
if (newVal) {
Object.defineProperties(newVal, Object.getOwnPropertyDescriptors(value));
return formatValue(ctx, newVal, recurseTimes);
}
}
// Note: using `formatValue` directly requires the indentation level to be
// corrected by setting `ctx.indentationLvL += diff` and then to decrease the
// value afterwards again.
function formatValue(ctx, value, recurseTimes) {
// Primitive types cannot have properties.
if (typeof value !== 'object' && typeof value !== 'function') {
return formatPrimitive(ctx.stylize, value, ctx);
}
if (value === null) {
return ctx.stylize('null', 'null');
}
if (ctx.stop !== undefined) {
const name = getConstructorName(value) || value[Symbol.toStringTag];
return ctx.stylize(`[${name || 'Object'}]`, 'special');
}
if (ctx.showProxy) {
const proxy = getProxyDetails(value);
if (proxy !== undefined) {
return formatProxy(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) {
const maybeCustom = value[customInspectSymbol];
if (typeof maybeCustom === 'function' &&
// Filter out the util module, its inspect function is special.
maybeCustom !== exports.inspect &&
// Also filter out any prototype objects using the circular check.
!(value.constructor && value.constructor.prototype === value)) {
const ret = maybeCustom.call(value, recurseTimes, ctx);
// If the custom inspection method returned `this`, don't go into
// infinite recursion.
if (ret !== value) {
if (typeof ret !== 'string') {
return formatValue(ctx, ret, recurseTimes);
}
return ret;
}
}
}
// Using an array here is actually better for the average case than using
// a Set. `seen` will only check for the depth and will never grow too large.
if (ctx.seen.indexOf(value) !== -1)
return ctx.stylize('[Circular]', 'special');
return formatRaw(ctx, value, recurseTimes);
}
function formatRaw(ctx, value, recurseTimes) {
let keys;
const constructor = getConstructorName(value);
let tag = value[Symbol.toStringTag];
if (typeof tag !== 'string')
tag = '';
let base = '';
let formatter = getEmptyFormatArray;
let braces;
let noIterator = true;
let i = 0;
let skip = false;
const filter = ctx.showHidden ? ALL_PROPERTIES : ONLY_ENUMERABLE;
let extrasType = kObjectType;
// Iterators and the rest are split to reduce checks.
if (value[Symbol.iterator]) {
noIterator = false;
if (Array.isArray(value)) {
keys = getOwnNonIndexProperties(value, filter);
// Only set the constructor for non ordinary ("Array [...]") arrays.
const prefix = getPrefix(constructor, tag);
braces = [`${prefix === 'Array ' ? '' : prefix}[`, ']'];
if (value.length === 0 && keys.length === 0)
return `${braces[0]}]`;
extrasType = kArrayExtrasType;
formatter = formatArray;
} else if (isSet(value)) {
keys = getKeys(value, ctx.showHidden);
const prefix = getPrefix(constructor, tag);
if (value.size === 0 && keys.length === 0)
return `${prefix}{}`;
braces = [`${prefix}{`, '}'];
formatter = formatSet;
} else if (isMap(value)) {
keys = getKeys(value, ctx.showHidden);
const prefix = getPrefix(constructor, tag);
if (value.size === 0 && keys.length === 0)
return `${prefix}{}`;
braces = [`${prefix}{`, '}'];
formatter = formatMap;
} else if (isTypedArray(value)) {
keys = getOwnNonIndexProperties(value, filter);
braces = [`${getPrefix(constructor, tag)}[`, ']'];
if (value.length === 0 && keys.length === 0 && !ctx.showHidden)
return `${braces[0]}]`;
formatter = formatTypedArray;
extrasType = kArrayExtrasType;
} else if (isMapIterator(value)) {
keys = getKeys(value, ctx.showHidden);
braces = [`[${tag}] {`, '}'];
formatter = formatMapIterator;
} else if (isSetIterator(value)) {
keys = getKeys(value, ctx.showHidden);
braces = [`[${tag}] {`, '}'];
formatter = formatSetIterator;
} else {
noIterator = true;
}
}
if (noIterator) {
keys = getKeys(value, ctx.showHidden);
braces = ['{', '}'];
if (constructor === 'Object') {
if (isArgumentsObject(value)) {
if (keys.length === 0)
return '[Arguments] {}';
braces[0] = '[Arguments] {';
} else if (tag !== '') {
braces[0] = `${getPrefix(constructor, tag)}{`;
if (keys.length === 0) {
return `${braces[0]}}`;
}
} else if (keys.length === 0) {
return '{}';
}
} else if (typeof value === 'function') {
const type = constructor || tag || 'Function';
const name = `${type}${value.name ? `: ${value.name}` : ''}`;
if (keys.length === 0)
return ctx.stylize(`[${name}]`, 'special');
base = `[${name}]`;
} else if (isRegExp(value)) {
// Make RegExps say that they are RegExps
if (keys.length === 0 || recurseTimes < 0)
return ctx.stylize(regExpToString(value), 'regexp');
base = `${regExpToString(value)}`;
} else if (isDate(value)) {
// Make dates with properties first say the date
if (keys.length === 0) {
if (Number.isNaN(dateGetTime(value)))
return ctx.stylize(String(value), 'date');
return ctx.stylize(dateToISOString(value), 'date');
}
base = dateToISOString(value);
} else if (isError(value)) {
// Make error with message first say the error.
base = formatError(value);
// Wrap the error in brackets in case it has no stack trace.
const stackStart = base.indexOf('\n at');
if (stackStart === -1) {
base = `[${base}]`;
}
// The message and the stack have to be indented as well!
if (ctx.indentationLvl !== 0) {
const indentation = ' '.repeat(ctx.indentationLvl);
base = formatError(value).replace(/\n/g, `\n${indentation}`);
}
if (keys.length === 0)
return base;
if (ctx.compact === false && stackStart !== -1) {
braces[0] += `${base.slice(stackStart)}`;
base = `[${base.slice(0, stackStart)}]`;
}
} else if (isAnyArrayBuffer(value)) {
let prefix = getPrefix(constructor, tag);
if (prefix === '') {
prefix = isArrayBuffer(value) ? 'ArrayBuffer ' : 'SharedArrayBuffer ';
}
// 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 (keys.length === 0)
return prefix +
`{ byteLength: ${formatNumber(ctx.stylize, value.byteLength)} }`;
braces[0] = `${prefix}{`;
keys.unshift('byteLength');
} else if (isDataView(value)) {
braces[0] = `${getPrefix(constructor, tag, 'DataView')}{`;
// .buffer goes last, it's not a primitive like the others.
keys.unshift('byteLength', 'byteOffset', 'buffer');
} else if (isPromise(value)) {
braces[0] = `${getPrefix(constructor, tag, 'Promise')}{`;
formatter = formatPromise;
} else if (isWeakSet(value)) {
braces[0] = `${getPrefix(constructor, tag, 'WeakSet')}{`;
formatter = ctx.showHidden ? formatWeakSet : formatWeakCollection;
} else if (isWeakMap(value)) {
braces[0] = `${getPrefix(constructor, tag, 'WeakMap')}{`;
formatter = ctx.showHidden ? formatWeakMap : formatWeakCollection;
} else if (types.isModuleNamespaceObject(value)) {
braces[0] = `[${tag}] {`;
formatter = formatNamespaceObject;
skip = true;
} else if (isBoxedPrimitive(value)) {
let type;
if (isNumberObject(value)) {
base = `[Number: ${getBoxedValue(numberValueOf(value))}]`;
type = 'number';
} else if (isStringObject(value)) {
base = `[String: ${getBoxedValue(stringValueOf(value), ctx)}]`;
type = 'string';
// For boxed Strings, we have to remove the 0-n indexed entries,
// since they just noisy up the output and are redundant
// Make boxed primitive Strings look like such
keys = keys.slice(value.length);
} else if (isBooleanObject(value)) {
base = `[Boolean: ${getBoxedValue(booleanValueOf(value))}]`;
type = 'boolean';
} else if (isBigIntObject(value)) {
base = `[BigInt: ${getBoxedValue(bigIntValueOf(value))}]`;
type = 'bigint';
} else {
base = `[Symbol: ${getBoxedValue(symbolValueOf(value))}]`;
type = 'symbol';
}
if (keys.length === 0) {
return ctx.stylize(base, type);
}
} else {
// The input prototype got manipulated. Special handle these. We have to
// rebuild the information so we are able to display everything.
const specialIterator = noPrototypeIterator(ctx, value, recurseTimes);
if (specialIterator) {
return specialIterator;
}
if (isMapIterator(value)) {
braces = [`[${tag || 'Map Iterator'}] {`, '}'];
formatter = formatMapIterator;
} else if (isSetIterator(value)) {
braces = [`[${tag || 'Set Iterator'}] {`, '}'];
formatter = formatSetIterator;
// Handle other regular objects again.
} else if (keys.length === 0) {
if (isExternal(value))
return ctx.stylize('[External]', 'special');
return `${getPrefix(constructor, tag)}{}`;
} else {
braces[0] = `${getPrefix(constructor, tag)}{`;
}
}
}
if (recurseTimes != null) {
if (recurseTimes < 0)
return ctx.stylize(`[${constructor || tag || 'Object'}]`, 'special');
recurseTimes -= 1;
}
ctx.seen.push(value);
let output;
const indentationLvl = ctx.indentationLvl;
try {
output = formatter(ctx, value, recurseTimes, keys);
if (skip === false) {
for (i = 0; i < keys.length; i++) {
output.push(
formatProperty(ctx, value, recurseTimes, keys[i], extrasType));
}
}
} catch (err) {
return handleMaxCallStackSize(ctx, err, constructor, tag, indentationLvl);
}
ctx.seen.pop();
const res = reduceToSingleString(ctx, output, base, braces);
const budget = ctx.budget[ctx.indentationLvl] || 0;
const newLength = budget + res.length;
ctx.budget[ctx.indentationLvl] = newLength;
// If any indentationLvl exceeds this limit, limit further inspecting to the
// minimum. Otherwise the recursive algorithm might continue inspecting the
// object even though the maximum string size (~2 ** 28 on 32 bit systems and
// ~2 ** 30 on 64 bit systems) exceeded. The actual output is not limited at
// exactly 2 ** 27 but a bit higher. This depends on the object shape.
// This limit also makes sure that huge objects don't block the event loop
// significantly.
if (newLength > 2 ** 27) {
ctx.stop = true;
}
return res;
}
function handleMaxCallStackSize(ctx, err, constructor, tag, indentationLvl) {
if (errors.isStackOverflowError(err)) {
ctx.seen.pop();
ctx.indentationLvl = indentationLvl;
return ctx.stylize(
`[${constructor || tag || 'Object'}: Inspection interrupted ` +
'prematurely. Maximum call stack size exceeded.]',
'special'
);
}
throw err;
}
function formatNumber(fn, value) {
// Format -0 as '-0'. Checking `value === -0` won't distinguish 0 from -0.
if (Object.is(value, -0))
return fn('-0', 'number');
return fn(`${value}`, 'number');
}
function formatBigInt(fn, value) {
return fn(`${value}n`, 'bigint');
}
function formatPrimitive(fn, value, ctx) {
if (typeof value === 'string') {
if (ctx.compact === false &&
ctx.indentationLvl + value.length > ctx.breakLength &&
value.length > MIN_LINE_LENGTH) {
// eslint-disable-next-line max-len
const minLineLength = Math.max(ctx.breakLength - ctx.indentationLvl, MIN_LINE_LENGTH);
// eslint-disable-next-line max-len
const averageLineLength = Math.ceil(value.length / Math.ceil(value.length / minLineLength));
const divisor = Math.max(averageLineLength, MIN_LINE_LENGTH);
let res = '';
if (readableRegExps[divisor] === undefined) {
// Build a new RegExp that naturally breaks text into multiple lines.
//
// Rules
// 1. Greedy match all text up the max line length that ends with a
// whitespace or the end of the string.
// 2. If none matches, non-greedy match any text up to a whitespace or
// the end of the string.
//
// eslint-disable-next-line max-len, node-core/no-unescaped-regexp-dot
readableRegExps[divisor] = new RegExp(`(.|\\n){1,${divisor}}(\\s|$)|(\\n|.)+?(\\s|$)`, 'gm');
}
const matches = value.match(readableRegExps[divisor]);
if (matches.length > 1) {
const indent = ' '.repeat(ctx.indentationLvl);
res += `${fn(strEscape(matches[0]), 'string')} +\n`;
for (var i = 1; i < matches.length - 1; i++) {
res += `${indent} ${fn(strEscape(matches[i]), 'string')} +\n`;
}
res += `${indent} ${fn(strEscape(matches[i]), 'string')}`;
return res;
}
}
return fn(strEscape(value), 'string');
}
if (typeof value === 'number')
return formatNumber(fn, value);
// eslint-disable-next-line valid-typeof
if (typeof value === 'bigint')
return formatBigInt(fn, value);
if (typeof value === 'boolean')
return fn(`${value}`, 'boolean');
if (typeof value === 'undefined')
return fn('undefined', 'undefined');
// es6 symbol primitive
return fn(value.toString(), 'symbol');
}
function formatError(value) {
return value.stack || errorToString(value);
}
function formatNamespaceObject(ctx, value, recurseTimes, keys) {
const len = keys.length;
const output = new Array(len);
for (var i = 0; i < len; i++) {
try {
output[i] = formatProperty(ctx, value, recurseTimes, keys[i],
kObjectType);
} catch (err) {
if (!(types.isNativeError(err) && err.name === 'ReferenceError')) {
throw err;