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inspect.js
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'use strict';
const {
ArrayIsArray,
BigIntPrototypeValueOf,
BooleanPrototypeValueOf,
DatePrototypeGetTime,
DatePrototypeToISOString,
DatePrototypeToString,
ErrorPrototypeToString,
JSONStringify,
MapPrototypeEntries,
MathFloor,
MathMax,
MathMin,
MathRound,
MathSqrt,
NumberPrototypeValueOf,
ObjectAssign,
ObjectCreate,
ObjectDefineProperties,
ObjectDefineProperty,
ObjectGetOwnPropertyDescriptor,
ObjectGetOwnPropertyDescriptors,
ObjectGetOwnPropertyNames,
ObjectGetOwnPropertySymbols,
ObjectGetPrototypeOf,
ObjectIs,
ObjectKeys,
ObjectPrototypeHasOwnProperty,
ObjectPrototypePropertyIsEnumerable,
ObjectSeal,
RegExpPrototypeToString,
SetPrototypeValues,
StringPrototypeValueOf,
SymbolPrototypeToString,
SymbolPrototypeValueOf,
SymbolIterator,
SymbolToStringTag,
uncurryThis
} = primordials;
const {
getOwnNonIndexProperties,
getPromiseDetails,
getProxyDetails,
kPending,
kRejected,
previewEntries,
getConstructorName: internalGetConstructorName,
propertyFilter: {
ALL_PROPERTIES,
ONLY_ENUMERABLE
}
} = internalBinding('util');
const {
customInspectSymbol,
isError,
join,
removeColors
} = require('internal/util');
const {
codes: {
ERR_INVALID_ARG_TYPE
},
isStackOverflowError
} = require('internal/errors');
const {
isAsyncFunction,
isGeneratorFunction,
isAnyArrayBuffer,
isArrayBuffer,
isArgumentsObject,
isBoxedPrimitive,
isDataView,
isExternal,
isMap,
isMapIterator,
isModuleNamespaceObject,
isNativeError,
isPromise,
isSet,
isSetIterator,
isWeakMap,
isWeakSet,
isRegExp,
isDate,
isTypedArray,
isStringObject,
isNumberObject,
isBooleanObject,
isBigIntObject,
isUint8Array,
isUint8ClampedArray,
isUint16Array,
isUint32Array,
isInt8Array,
isInt16Array,
isInt32Array,
isFloat32Array,
isFloat64Array,
isBigInt64Array,
isBigUint64Array
} = require('internal/util/types');
const assert = require('internal/assert');
const { NativeModule } = require('internal/bootstrap/loaders');
let hexSlice;
const builtInObjects = new Set(
ObjectGetOwnPropertyNames(global).filter((e) => /^([A-Z][a-z]+)+$/.test(e))
);
// These options must stay in sync with `getUserOptions`. So if any option will
// be added or removed, `getUserOptions` must also be updated accordingly.
const inspectDefaultOptions = ObjectSeal({
showHidden: false,
depth: 2,
colors: false,
customInspect: true,
showProxy: false,
maxArrayLength: 100,
breakLength: 80,
compact: 3,
sorted: false,
getters: false
});
const kObjectType = 0;
const kArrayType = 1;
const kArrayExtrasType = 2;
/* eslint-disable no-control-regex */
const strEscapeSequencesRegExp = /[\x00-\x1f\x27\x5c\x7f-\x9f]/;
const strEscapeSequencesReplacer = /[\x00-\x1f\x27\x5c\x7f-\x9f]/g;
const strEscapeSequencesRegExpSingle = /[\x00-\x1f\x5c\x7f-\x9f]/;
const strEscapeSequencesReplacerSingle = /[\x00-\x1f\x5c\x7f-\x9f]/g;
/* eslint-enable no-control-regex */
const keyStrRegExp = /^[a-zA-Z_][a-zA-Z_0-9]*$/;
const numberRegExp = /^(0|[1-9][0-9]*)$/;
const coreModuleRegExp = /^ at (?:[^/\\(]+ \(|)((?<![/\\]).+)\.js:\d+:\d+\)?$/;
const nodeModulesRegExp = /[/\\]node_modules[/\\](.+?)(?=[/\\])/g;
const kMinLineLength = 16;
// Constants to map the iterator state.
const kWeak = 0;
const kIterator = 1;
const kMapEntries = 2;
// Escaped control characters (plus the single quote and the backslash). Use
// empty strings to fill up unused entries.
const meta = [
'\\x00', '\\x01', '\\x02', '\\x03', '\\x04', '\\x05', '\\x06', '\\x07', // x07
'\\b', '\\t', '\\n', '\\x0B', '\\f', '\\r', '\\x0E', '\\x0F', // x0F
'\\x10', '\\x11', '\\x12', '\\x13', '\\x14', '\\x15', '\\x16', '\\x17', // x17
'\\x18', '\\x19', '\\x1A', '\\x1B', '\\x1C', '\\x1D', '\\x1E', '\\x1F', // x1F
'', '', '', '', '', '', '', "\\'", '', '', '', '', '', '', '', '', // x2F
'', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', // x3F
'', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', // x4F
'', '', '', '', '', '', '', '', '', '', '', '', '\\\\', '', '', '', // x5F
'', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', // x6F
'', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '\\x7F', // x7F
'\\x80', '\\x81', '\\x82', '\\x83', '\\x84', '\\x85', '\\x86', '\\x87', // x87
'\\x88', '\\x89', '\\x8A', '\\x8B', '\\x8C', '\\x8D', '\\x8E', '\\x8F', // x8F
'\\x90', '\\x91', '\\x92', '\\x93', '\\x94', '\\x95', '\\x96', '\\x97', // x97
'\\x98', '\\x99', '\\x9A', '\\x9B', '\\x9C', '\\x9D', '\\x9E', '\\x9F', // x9F
];
function getUserOptions(ctx) {
return {
stylize: ctx.stylize,
showHidden: ctx.showHidden,
depth: ctx.depth,
colors: ctx.colors,
customInspect: ctx.customInspect,
showProxy: ctx.showProxy,
maxArrayLength: ctx.maxArrayLength,
breakLength: ctx.breakLength,
compact: ctx.compact,
sorted: ctx.sorted,
getters: ctx.getters,
...ctx.userOptions
};
}
/**
* 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 = {
budget: {},
indentationLvl: 0,
seen: [],
currentDepth: 0,
stylize: stylizeNoColor,
showHidden: inspectDefaultOptions.showHidden,
depth: inspectDefaultOptions.depth,
colors: inspectDefaultOptions.colors,
customInspect: inspectDefaultOptions.customInspect,
showProxy: inspectDefaultOptions.showProxy,
maxArrayLength: inspectDefaultOptions.maxArrayLength,
breakLength: inspectDefaultOptions.breakLength,
compact: inspectDefaultOptions.compact,
sorted: inspectDefaultOptions.sorted,
getters: inspectDefaultOptions.getters
};
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 = ObjectKeys(opts);
for (const key of optKeys) {
// TODO(BridgeAR): Find a solution what to do about stylize. Either make
// this function public or add a new API with a similar or better
// functionality.
if (
ObjectPrototypeHasOwnProperty(inspectDefaultOptions, key) ||
key === 'stylize') {
ctx[key] = opts[key];
} else if (ctx.userOptions === undefined) {
// This is required to pass through the actual user input.
ctx.userOptions = opts;
}
}
}
}
if (ctx.colors) ctx.stylize = stylizeWithColor;
if (ctx.maxArrayLength === null) ctx.maxArrayLength = Infinity;
return formatValue(ctx, value, 0);
}
inspect.custom = customInspectSymbol;
ObjectDefineProperty(inspect, 'defaultOptions', {
get() {
return inspectDefaultOptions;
},
set(options) {
if (options === null || typeof options !== 'object') {
throw new ERR_INVALID_ARG_TYPE('options', 'Object', options);
}
return ObjectAssign(inspectDefaultOptions, options);
}
});
// Set Graphics Rendition http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
// Each color consists of an array with the color code as first entry and the
// reset code as second entry.
const defaultFG = 39;
const defaultBG = 49;
inspect.colors = ObjectAssign(ObjectCreate(null), {
reset: [0, 0],
bold: [1, 22],
dim: [2, 22], // Alias: faint
italic: [3, 23],
underline: [4, 24],
blink: [5, 25],
// Swap forground and background colors
inverse: [7, 27], // Alias: swapcolors, swapColors
hidden: [8, 28], // Alias: conceal
strikethrough: [9, 29], // Alias: strikeThrough, crossedout, crossedOut
doubleunderline: [21, 24], // Alias: doubleUnderline
black: [30, defaultFG],
red: [31, defaultFG],
green: [32, defaultFG],
yellow: [33, defaultFG],
blue: [34, defaultFG],
magenta: [35, defaultFG],
cyan: [36, defaultFG],
white: [37, defaultFG],
bgBlack: [40, defaultBG],
bgRed: [41, defaultBG],
bgGreen: [42, defaultBG],
bgYellow: [43, defaultBG],
bgBlue: [44, defaultBG],
bgMagenta: [45, defaultBG],
bgCyan: [46, defaultBG],
bgWhite: [47, defaultBG],
framed: [51, 54],
overlined: [53, 55],
gray: [90, defaultFG], // Alias: grey, blackBright
redBright: [91, defaultFG],
greenBright: [92, defaultFG],
yellowBright: [93, defaultFG],
blueBright: [94, defaultFG],
magentaBright: [95, defaultFG],
cyanBright: [96, defaultFG],
whiteBright: [97, defaultFG],
bgGray: [100, defaultBG], // Alias: bgGrey, bgBlackBright
bgRedBright: [101, defaultBG],
bgGreenBright: [102, defaultBG],
bgYellowBright: [103, defaultBG],
bgBlueBright: [104, defaultBG],
bgMagentaBright: [105, defaultBG],
bgCyanBright: [106, defaultBG],
bgWhiteBright: [107, defaultBG],
});
function defineColorAlias(target, alias) {
ObjectDefineProperty(inspect.colors, alias, {
get() {
return this[target];
},
set(value) {
this[target] = value;
},
configurable: true,
enumerable: false
});
}
defineColorAlias('gray', 'grey');
defineColorAlias('gray', 'blackBright');
defineColorAlias('bgGray', 'bgGrey');
defineColorAlias('bgGray', 'bgBlackBright');
defineColorAlias('dim', 'faint');
defineColorAlias('strikethrough', 'crossedout');
defineColorAlias('strikethrough', 'strikeThrough');
defineColorAlias('strikethrough', 'crossedOut');
defineColorAlias('hidden', 'conceal');
defineColorAlias('inverse', 'swapColors');
defineColorAlias('inverse', 'swapcolors');
defineColorAlias('doubleunderline', 'doubleUnderline');
// TODO(BridgeAR): Add function style support for more complex styles.
// Don't use 'blue' not visible on cmd.exe
inspect.styles = ObjectAssign(ObjectCreate(null), {
special: 'cyan',
number: 'yellow',
bigint: 'yellow',
boolean: 'yellow',
undefined: 'grey',
null: 'bold',
string: 'green',
symbol: 'green',
date: 'magenta',
// "name": intentionally not styling
// TODO(BridgeAR): Highlight regular expressions properly.
regexp: 'red',
module: 'underline'
});
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.includes("'")) {
// This invalidates the charCode and therefore can not be matched for
// anymore.
if (!str.includes('"')) {
singleQuote = -1;
} else if (!str.includes('`') && !str.includes('${')) {
singleQuote = -2;
}
if (singleQuote !== 39) {
escapeTest = strEscapeSequencesRegExpSingle;
escapeReplace = strEscapeSequencesReplacerSingle;
}
}
// Some magic numbers that worked out fine while benchmarking with v8 6.0
if (str.length < 5000 && !escapeTest.test(str))
return addQuotes(str, singleQuote);
if (str.length > 100) {
str = str.replace(escapeReplace, escapeFn);
return addQuotes(str, singleQuote);
}
let result = '';
let last = 0;
const lastIndex = str.length;
for (let i = 0; i < lastIndex; i++) {
const point = str.charCodeAt(i);
if (point === singleQuote ||
point === 92 ||
point < 32 ||
(point > 126 && point < 160)) {
if (last === i) {
result += meta[point];
} else {
result += `${str.slice(last, i)}${meta[point]}`;
}
last = i + 1;
}
}
if (last !== lastIndex) {
result += str.slice(last);
}
return addQuotes(result, singleQuote);
}
function stylizeWithColor(str, styleType) {
const style = inspect.styles[styleType];
if (style !== undefined) {
const color = inspect.colors[style];
return `\u001b[${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, ctx, recurseTimes) {
let firstProto;
const tmp = obj;
while (obj) {
const descriptor = ObjectGetOwnPropertyDescriptor(obj, 'constructor');
if (descriptor !== undefined &&
typeof descriptor.value === 'function' &&
descriptor.value.name !== '') {
return descriptor.value.name;
}
obj = ObjectGetPrototypeOf(obj);
if (firstProto === undefined) {
firstProto = obj;
}
}
if (firstProto === null) {
return null;
}
const res = internalGetConstructorName(tmp);
if (recurseTimes > ctx.depth && ctx.depth !== null) {
return `${res} <Complex prototype>`;
}
const protoConstr = getConstructorName(firstProto, ctx, recurseTimes + 1);
if (protoConstr === null) {
return `${res} <${inspect(firstProto, {
...ctx,
customInspect: false,
depth: -1
})}>`;
}
return `${res} <${protoConstr}>`;
}
function getPrefix(constructor, tag, fallback) {
if (constructor === null) {
if (tag !== '') {
return `[${fallback}: null prototype] [${tag}] `;
}
return `[${fallback}: null prototype] `;
}
if (tag !== '' && constructor !== tag) {
return `${constructor} [${tag}] `;
}
return `${constructor} `;
}
// Look up the keys of the object.
function getKeys(value, showHidden) {
let keys;
const symbols = ObjectGetOwnPropertySymbols(value);
if (showHidden) {
keys = ObjectGetOwnPropertyNames(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 = ObjectKeys(value);
} catch (err) {
assert(isNativeError(err) && err.name === 'ReferenceError' &&
isModuleNamespaceObject(value));
keys = ObjectGetOwnPropertyNames(value);
}
if (symbols.length !== 0) {
const filter = (key) => ObjectPrototypePropertyIsEnumerable(value, key);
keys.push(...symbols.filter(filter));
}
}
return keys;
}
function getCtxStyle(value, constructor, tag) {
let fallback = '';
if (constructor === null) {
fallback = internalGetConstructorName(value);
if (fallback === tag) {
fallback = 'Object';
}
}
return getPrefix(constructor, tag, fallback);
}
function formatProxy(ctx, proxy, recurseTimes) {
if (recurseTimes > ctx.depth && ctx.depth !== null) {
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;
return reduceToSingleString(
ctx, res, '', ['Proxy [', ']'], kArrayExtrasType, recurseTimes);
}
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;
}
}
}
let lazyNullPrototypeCache;
// Creates a subclass and name
// the constructor as `${clazz} : null prototype`
function clazzWithNullPrototype(clazz, name) {
if (lazyNullPrototypeCache === undefined) {
lazyNullPrototypeCache = new Map();
} else {
const cachedClass = lazyNullPrototypeCache.get(clazz);
if (cachedClass !== undefined) {
return cachedClass;
}
}
class NullPrototype extends clazz {
get [SymbolToStringTag]() {
return '';
}
}
ObjectDefineProperty(NullPrototype.prototype.constructor, 'name',
{ value: `[${name}: null prototype]` });
lazyNullPrototypeCache.set(clazz, NullPrototype);
return NullPrototype;
}
function noPrototypeIterator(ctx, value, recurseTimes) {
let newVal;
if (isSet(value)) {
const clazz = clazzWithNullPrototype(Set, 'Set');
newVal = new clazz(SetPrototypeValues(value));
} else if (isMap(value)) {
const clazz = clazzWithNullPrototype(Map, 'Map');
newVal = new clazz(MapPrototypeEntries(value));
} else if (ArrayIsArray(value)) {
const clazz = clazzWithNullPrototype(Array, 'Array');
newVal = new clazz(value.length);
} else if (isTypedArray(value)) {
const constructor = findTypedConstructor(value);
const clazz = clazzWithNullPrototype(constructor, constructor.name);
newVal = new clazz(value);
}
if (newVal !== undefined) {
ObjectDefineProperties(newVal, ObjectGetOwnPropertyDescriptors(value));
return formatRaw(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, typedArray) {
// 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');
}
// Memorize the context for custom inspection on proxies.
const context = value;
// Always check for proxies to prevent side effects and to prevent triggering
// any proxy handlers.
const proxy = getProxyDetails(value);
if (proxy !== undefined) {
if (ctx.showProxy) {
return formatProxy(ctx, proxy, recurseTimes);
}
value = proxy[0];
}
// 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 !== inspect &&
// Also filter out any prototype objects using the circular check.
!(value.constructor && value.constructor.prototype === value)) {
// This makes sure the recurseTimes are reported as before while using
// a counter internally.
const depth = ctx.depth === null ? null : ctx.depth - recurseTimes;
const ret = maybeCustom.call(context, depth, getUserOptions(ctx));
// If the custom inspection method returned `this`, don't go into
// infinite recursion.
if (ret !== context) {
if (typeof ret !== 'string') {
return formatValue(ctx, ret, recurseTimes);
}
return ret.replace(/\n/g, `\n${' '.repeat(ctx.indentationLvl)}`);
}
}
}
// 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.includes(value)) {
let index = 1;
if (ctx.circular === undefined) {
ctx.circular = new Map([[value, index]]);
} else {
index = ctx.circular.get(value);
if (index === undefined) {
index = ctx.circular.size + 1;
ctx.circular.set(value, index);
}
}
return ctx.stylize(`[Circular *${index}]`, 'special');
}
return formatRaw(ctx, value, recurseTimes, typedArray);
}
function formatRaw(ctx, value, recurseTimes, typedArray) {
let keys;
const constructor = getConstructorName(value, ctx, recurseTimes);
let tag = value[SymbolToStringTag];
// Only list the tag in case it's non-enumerable / not an own property.
// Otherwise we'd print this twice.
if (typeof tag !== 'string' ||
(tag !== '' &&
(ctx.showHidden ?
ObjectPrototypeHasOwnProperty :
ObjectPrototypePropertyIsEnumerable)(
value, SymbolToStringTag
))) {
tag = '';
}
let base = '';
let formatter = getEmptyFormatArray;
let braces;
let noIterator = true;
let i = 0;
const filter = ctx.showHidden ? ALL_PROPERTIES : ONLY_ENUMERABLE;
let extrasType = kObjectType;
// Iterators and the rest are split to reduce checks.
if (value[SymbolIterator]) {
noIterator = false;
if (ArrayIsArray(value)) {
keys = getOwnNonIndexProperties(value, filter);
// Only set the constructor for non ordinary ("Array [...]") arrays.
const prefix = getPrefix(constructor, tag, 'Array');
braces = [`${prefix === 'Array ' ? '' : prefix}[`, ']'];
if (value.length === 0 && keys.length === 0)
return `${braces[0]}]`;
extrasType = kArrayExtrasType;
formatter = formatArray;
} else if (isSet(value)) {
keys = getKeys(value, ctx.showHidden);
const prefix = getPrefix(constructor, tag, 'Set');
if (value.size === 0 && keys.length === 0)
return `${prefix}{}`;
braces = [`${prefix}{`, '}'];
formatter = formatSet;
} else if (isMap(value)) {
keys = getKeys(value, ctx.showHidden);
const prefix = getPrefix(constructor, tag, 'Map');
if (value.size === 0 && keys.length === 0)
return `${prefix}{}`;
braces = [`${prefix}{`, '}'];
formatter = formatMap;
} else if (isTypedArray(value)) {
keys = getOwnNonIndexProperties(value, filter);
const prefix = constructor !== null ?
getPrefix(constructor, tag) :
getPrefix(constructor, tag, findTypedConstructor(value).name);
braces = [`${prefix}[`, ']'];
if (value.length === 0 && keys.length === 0 && !ctx.showHidden)
return `${braces[0]}]`;
formatter = formatTypedArray;
extrasType = kArrayExtrasType;
} else if (isMapIterator(value)) {
keys = getKeys(value, ctx.showHidden);
braces = getIteratorBraces('Map', tag);
formatter = formatIterator;
} else if (isSetIterator(value)) {
keys = getKeys(value, ctx.showHidden);
braces = getIteratorBraces('Set', tag);
formatter = formatIterator;
} else {
noIterator = true;
}
}
if (noIterator) {
keys = getKeys(value, ctx.showHidden);
braces = ['{', '}'];
if (constructor === 'Object') {
if (isArgumentsObject(value)) {
braces[0] = '[Arguments] {';
} else if (tag !== '') {
braces[0] = `${getPrefix(constructor, tag, 'Object')}{`;
}
if (keys.length === 0) {
return `${braces[0]}}`;
}
} else if (typeof value === 'function') {
base = getFunctionBase(value, constructor, tag);
if (keys.length === 0)
return ctx.stylize(base, 'special');
} else if (isRegExp(value)) {
// Make RegExps say that they are RegExps
base = RegExpPrototypeToString(
constructor !== null ? value : new RegExp(value)
);
const prefix = getPrefix(constructor, tag, 'RegExp');
if (prefix !== 'RegExp ')
base = `${prefix}${base}`;
if (keys.length === 0 || (recurseTimes > ctx.depth && ctx.depth !== null))
return ctx.stylize(base, 'regexp');
} else if (isDate(value)) {
// Make dates with properties first say the date
base = Number.isNaN(DatePrototypeGetTime(value)) ?
DatePrototypeToString(value) :
DatePrototypeToISOString(value);
const prefix = getPrefix(constructor, tag, 'Date');
if (prefix !== 'Date ')
base = `${prefix}${base}`;
if (keys.length === 0) {
return ctx.stylize(base, 'date');
}
} else if (isError(value)) {
base = formatError(value, constructor, tag, ctx);
if (keys.length === 0)
return base;
} else if (isAnyArrayBuffer(value)) {
// 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.
const arrayType = isArrayBuffer(value) ? 'ArrayBuffer' :
'SharedArrayBuffer';
const prefix = getPrefix(constructor, tag, arrayType);
if (typedArray === undefined) {
formatter = formatArrayBuffer;
} else 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 (isModuleNamespaceObject(value)) {
braces[0] = `[${tag}] {`;
formatter = formatNamespaceObject;
} else if (isBoxedPrimitive(value)) {
base = getBoxedBase(value, ctx, keys, constructor, tag);
if (keys.length === 0) {
return base;
}
} else {
// The input prototype got manipulated. Special handle these. We have to
// rebuild the information so we are able to display everything.
if (constructor === null) {
const specialIterator = noPrototypeIterator(ctx, value, recurseTimes);
if (specialIterator) {
return specialIterator;
}
}
if (isMapIterator(value)) {
braces = getIteratorBraces('Map', tag);
formatter = formatIterator;
} else if (isSetIterator(value)) {
braces = getIteratorBraces('Set', tag);
formatter = formatIterator;
// Handle other regular objects again.
} else {
if (keys.length === 0) {
if (isExternal(value))
return ctx.stylize('[External]', 'special');
return `${getCtxStyle(value, constructor, tag)}{}`;
}
braces[0] = `${getCtxStyle(value, constructor, tag)}{`;
}
}
}
if (recurseTimes > ctx.depth && ctx.depth !== null) {
let constructorName = getCtxStyle(value, constructor, tag).slice(0, -1);
if (constructor !== null)
constructorName = `[${constructorName}]`;
return ctx.stylize(constructorName, 'special');
}
recurseTimes += 1;
ctx.seen.push(value);
ctx.currentDepth = recurseTimes;
let output;
const indentationLvl = ctx.indentationLvl;
try {
output = formatter(ctx, value, recurseTimes, keys, braces);
for (i = 0; i < keys.length; i++) {
output.push(
formatProperty(ctx, value, recurseTimes, keys[i], extrasType));
}
} catch (err) {
const constructorName = getCtxStyle(value, constructor, tag).slice(0, -1);
return handleMaxCallStackSize(ctx, err, constructorName, indentationLvl);
}
if (ctx.circular !== undefined) {
const index = ctx.circular.get(value);
if (index !== undefined) {
const reference = ctx.stylize(`<ref *${index}>`, 'special');
// Add reference always to the very beginning of the output.
if (ctx.compact !== true) {
base = base === '' ? reference : `${reference} ${base}`;
} else {
braces[0] = `${reference} ${braces[0]}`;
}
}
}
ctx.seen.pop();
if (ctx.sorted) {
const comparator = ctx.sorted === true ? undefined : ctx.sorted;
if (extrasType === kObjectType) {
output = output.sort(comparator);
} else if (keys.length > 1) {
const sorted = output.slice(output.length - keys.length).sort(comparator);
output.splice(output.length - keys.length, keys.length, ...sorted);
}
}
const res = reduceToSingleString(
ctx, output, base, braces, extrasType, recurseTimes, value);
const budget = ctx.budget[ctx.indentationLvl] || 0;
const newLength = budget + res.length;
ctx.budget[ctx.indentationLvl] = newLength;
// If any indentationLvl exceeds this limit, limit further inspecting to the
// minimum. Otherwise the recursive algorithm might continue inspecting the
// object even though the maximum string size (~2 ** 28 on 32 bit systems and
// ~2 ** 30 on 64 bit systems) exceeded. The actual output is not limited at
// exactly 2 ** 27 but a bit higher. This depends on the object shape.
// This limit also makes sure that huge objects don't block the event loop
// significantly.
if (newLength > 2 ** 27) {
ctx.depth = -1;
}
return res;
}
function getIteratorBraces(type, tag) {
if (tag !== `${type} Iterator`) {
if (tag !== '')
tag += '] [';
tag += `${type} Iterator`;
}
return [`[${tag}] {`, '}'];
}
function getBoxedBase(value, ctx, keys, constructor, tag) {
let fn;
let type;
if (isNumberObject(value)) {
fn = NumberPrototypeValueOf;
type = 'Number';
} else if (isStringObject(value)) {
fn = StringPrototypeValueOf;
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.splice(0, value.length);
} else if (isBooleanObject(value)) {
fn = BooleanPrototypeValueOf;
type = 'Boolean';
} else if (isBigIntObject(value)) {
fn = BigIntPrototypeValueOf;
type = 'BigInt';
} else {
fn = SymbolPrototypeValueOf;
type = 'Symbol';
}
let base = `[${type}`;
if (type !== constructor) {
if (constructor === null) {
base += ' (null prototype)';
} else {
base += ` (${constructor})`;
}
}
base += `: ${formatPrimitive(stylizeNoColor, fn(value), ctx)}]`;
if (tag !== '' && tag !== constructor) {
base += ` [${tag}]`;
}
if (keys.length !== 0 || ctx.stylize === stylizeNoColor)
return base;
return ctx.stylize(base, type.toLowerCase());
}
function getFunctionBase(value, constructor, tag) {
let type = 'Function';
if (isGeneratorFunction(value)) {
type = `Generator${type}`;
}
if (isAsyncFunction(value)) {
type = `Async${type}`;
}
let base = `[${type}`;
if (constructor === null) {
base += ' (null prototype)';
}
if (value.name === '') {
base += ' (anonymous)';
} else {
base += `: ${value.name}`;
}