current/lib/internal/console/constructor.js
'use strict';
// The Console constructor is not actually used to construct the global
// console. It's exported for backwards compatibility.
const {
ArrayFrom,
ArrayIsArray,
Boolean,
Error,
Map,
MathFloor,
Number,
ObjectDefineProperties,
ObjectDefineProperty,
ObjectKeys,
ObjectPrototypeHasOwnProperty,
ObjectValues,
ReflectOwnKeys,
Symbol,
SymbolHasInstance,
WeakMap,
} = primordials;
const { trace } = internalBinding('trace_events');
const {
isStackOverflowError,
codes: {
ERR_CONSOLE_WRITABLE_STREAM,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INCOMPATIBLE_OPTION_PAIR,
},
} = require('internal/errors');
const { validateInteger } = require('internal/validators');
const { previewEntries } = internalBinding('util');
const { Buffer: { isBuffer } } = require('buffer');
const {
inspect,
formatWithOptions
} = require('internal/util/inspect');
const {
isTypedArray, isSet, isMap, isSetIterator, isMapIterator,
} = require('internal/util/types');
const {
CHAR_LOWERCASE_B,
CHAR_LOWERCASE_E,
CHAR_LOWERCASE_N,
CHAR_UPPERCASE_C,
} = require('internal/constants');
const kCounts = Symbol('counts');
const kTraceConsoleCategory = 'node,node.console';
const kTraceCount = CHAR_UPPERCASE_C;
const kTraceBegin = CHAR_LOWERCASE_B;
const kTraceEnd = CHAR_LOWERCASE_E;
const kTraceInstant = CHAR_LOWERCASE_N;
const kSecond = 1000;
const kMinute = 60 * kSecond;
const kHour = 60 * kMinute;
const kMaxGroupIndentation = 1000;
// Lazy loaded for startup performance.
let cliTable;
// Track amount of indentation required via `console.group()`.
const kGroupIndent = Symbol('kGroupIndent');
const kGroupIndentationWidth = Symbol('kGroupIndentWidth');
const kFormatForStderr = Symbol('kFormatForStderr');
const kFormatForStdout = Symbol('kFormatForStdout');
const kGetInspectOptions = Symbol('kGetInspectOptions');
const kColorMode = Symbol('kColorMode');
const kIsConsole = Symbol('kIsConsole');
const kWriteToConsole = Symbol('kWriteToConsole');
const kBindProperties = Symbol('kBindProperties');
const kBindStreamsEager = Symbol('kBindStreamsEager');
const kBindStreamsLazy = Symbol('kBindStreamsLazy');
const kUseStdout = Symbol('kUseStdout');
const kUseStderr = Symbol('kUseStderr');
const optionsMap = new WeakMap();
function Console(options /* or: stdout, stderr, ignoreErrors = true */) {
// We have to test new.target here to see if this function is called
// with new, because we need to define a custom instanceof to accommodate
// the global console.
if (!new.target) {
return new Console(...arguments);
}
if (!options || typeof options.write === 'function') {
options = {
stdout: options,
stderr: arguments[1],
ignoreErrors: arguments[2]
};
}
const {
stdout,
stderr = stdout,
ignoreErrors = true,
colorMode = 'auto',
inspectOptions,
groupIndentation,
} = options;
if (!stdout || typeof stdout.write !== 'function') {
throw new ERR_CONSOLE_WRITABLE_STREAM('stdout');
}
if (!stderr || typeof stderr.write !== 'function') {
throw new ERR_CONSOLE_WRITABLE_STREAM('stderr');
}
if (typeof colorMode !== 'boolean' && colorMode !== 'auto')
throw new ERR_INVALID_ARG_VALUE('colorMode', colorMode);
if (groupIndentation !== undefined) {
validateInteger(groupIndentation, 'groupIndentation',
0, kMaxGroupIndentation);
}
if (typeof inspectOptions === 'object' && inspectOptions !== null) {
if (inspectOptions.colors !== undefined &&
options.colorMode !== undefined) {
throw new ERR_INCOMPATIBLE_OPTION_PAIR(
'options.inspectOptions.color', 'colorMode');
}
optionsMap.set(this, inspectOptions);
} else if (inspectOptions !== undefined) {
throw new ERR_INVALID_ARG_TYPE(
'options.inspectOptions',
'object',
inspectOptions);
}
// Bind the prototype functions to this Console instance
const keys = ObjectKeys(Console.prototype);
for (const key of keys) {
// We have to bind the methods grabbed from the instance instead of from
// the prototype so that users extending the Console can override them
// from the prototype chain of the subclass.
this[key] = this[key].bind(this);
ObjectDefineProperty(this[key], 'name', {
value: key
});
}
this[kBindStreamsEager](stdout, stderr);
this[kBindProperties](ignoreErrors, colorMode, groupIndentation);
}
const consolePropAttributes = {
writable: true,
enumerable: false,
configurable: true
};
// Fixup global.console instanceof global.console.Console
ObjectDefineProperty(Console, SymbolHasInstance, {
value(instance) {
return instance[kIsConsole];
}
});
const kColorInspectOptions = { colors: true };
const kNoColorInspectOptions = {};
ObjectDefineProperties(Console.prototype, {
[kBindStreamsEager]: {
...consolePropAttributes,
// Eager version for the Console constructor
value: function(stdout, stderr) {
ObjectDefineProperties(this, {
'_stdout': { ...consolePropAttributes, value: stdout },
'_stderr': { ...consolePropAttributes, value: stderr }
});
}
},
[kBindStreamsLazy]: {
...consolePropAttributes,
// Lazily load the stdout and stderr from an object so we don't
// create the stdio streams when they are not even accessed
value: function(object) {
let stdout;
let stderr;
ObjectDefineProperties(this, {
'_stdout': {
enumerable: false,
configurable: true,
get() {
if (!stdout) stdout = object.stdout;
return stdout;
},
set(value) { stdout = value; }
},
'_stderr': {
enumerable: false,
configurable: true,
get() {
if (!stderr) { stderr = object.stderr; }
return stderr;
},
set(value) { stderr = value; }
}
});
}
},
[kBindProperties]: {
...consolePropAttributes,
value: function(ignoreErrors, colorMode, groupIndentation = 2) {
ObjectDefineProperties(this, {
'_stdoutErrorHandler': {
...consolePropAttributes,
value: createWriteErrorHandler(this, kUseStdout)
},
'_stderrErrorHandler': {
...consolePropAttributes,
value: createWriteErrorHandler(this, kUseStderr)
},
'_ignoreErrors': {
...consolePropAttributes,
value: Boolean(ignoreErrors)
},
'_times': { ...consolePropAttributes, value: new Map() },
// Corresponds to https://console.spec.whatwg.org/#count-map
[kCounts]: { ...consolePropAttributes, value: new Map() },
[kColorMode]: { ...consolePropAttributes, value: colorMode },
[kIsConsole]: { ...consolePropAttributes, value: true },
[kGroupIndent]: { ...consolePropAttributes, value: '' },
[kGroupIndentationWidth]: {
...consolePropAttributes,
value: groupIndentation
},
});
}
},
[kWriteToConsole]: {
...consolePropAttributes,
value: function(streamSymbol, string) {
const ignoreErrors = this._ignoreErrors;
const groupIndent = this[kGroupIndent];
const useStdout = streamSymbol === kUseStdout;
const stream = useStdout ? this._stdout : this._stderr;
const errorHandler = useStdout ?
this._stdoutErrorHandler : this._stderrErrorHandler;
if (groupIndent.length !== 0) {
if (string.includes('\n')) {
string = string.replace(/\n/g, `\n${groupIndent}`);
}
string = groupIndent + string;
}
string += '\n';
if (ignoreErrors === false) return stream.write(string);
// There may be an error occurring synchronously (e.g. for files or TTYs
// on POSIX systems) or asynchronously (e.g. pipes on POSIX systems), so
// handle both situations.
try {
// Add and later remove a noop error handler to catch synchronous
// errors.
if (stream.listenerCount('error') === 0)
stream.once('error', noop);
stream.write(string, errorHandler);
} catch (e) {
// Console is a debugging utility, so it swallowing errors is not
// desirable even in edge cases such as low stack space.
if (isStackOverflowError(e))
throw e;
// Sorry, there's no proper way to pass along the error here.
} finally {
stream.removeListener('error', noop);
}
}
},
[kGetInspectOptions]: {
...consolePropAttributes,
value: function(stream) {
let color = this[kColorMode];
if (color === 'auto') {
color = stream.isTTY && (
typeof stream.getColorDepth === 'function' ?
stream.getColorDepth() > 2 : true);
}
const options = optionsMap.get(this);
if (options) {
if (options.colors === undefined) {
options.colors = color;
}
return options;
}
return color ? kColorInspectOptions : kNoColorInspectOptions;
}
},
[kFormatForStdout]: {
...consolePropAttributes,
value: function(args) {
const opts = this[kGetInspectOptions](this._stdout);
return formatWithOptions(opts, ...args);
}
},
[kFormatForStderr]: {
...consolePropAttributes,
value: function(args) {
const opts = this[kGetInspectOptions](this._stderr);
return formatWithOptions(opts, ...args);
}
},
});
// Make a function that can serve as the callback passed to `stream.write()`.
function createWriteErrorHandler(instance, streamSymbol) {
return (err) => {
// This conditional evaluates to true if and only if there was an error
// that was not already emitted (which happens when the _write callback
// is invoked asynchronously).
const stream = streamSymbol === kUseStdout ?
instance._stdout : instance._stderr;
if (err !== null && !stream._writableState.errorEmitted) {
// If there was an error, it will be emitted on `stream` as
// an `error` event. Adding a `once` listener will keep that error
// from becoming an uncaught exception, but since the handler is
// removed after the event, non-console.* writes won't be affected.
// we are only adding noop if there is no one else listening for 'error'
if (stream.listenerCount('error') === 0) {
stream.once('error', noop);
}
}
};
}
const consoleMethods = {
log(...args) {
this[kWriteToConsole](kUseStdout, this[kFormatForStdout](args));
},
warn(...args) {
this[kWriteToConsole](kUseStderr, this[kFormatForStderr](args));
},
dir(object, options) {
this[kWriteToConsole](kUseStdout, inspect(object, {
customInspect: false,
...this[kGetInspectOptions](this._stdout),
...options
}));
},
time(label = 'default') {
// Coerces everything other than Symbol to a string
label = `${label}`;
if (this._times.has(label)) {
process.emitWarning(`Label '${label}' already exists for console.time()`);
return;
}
trace(kTraceBegin, kTraceConsoleCategory, `time::${label}`, 0);
this._times.set(label, process.hrtime());
},
timeEnd(label = 'default') {
// Coerces everything other than Symbol to a string
label = `${label}`;
const found = timeLogImpl(this, 'timeEnd', label);
trace(kTraceEnd, kTraceConsoleCategory, `time::${label}`, 0);
if (found) {
this._times.delete(label);
}
},
timeLog(label = 'default', ...data) {
// Coerces everything other than Symbol to a string
label = `${label}`;
timeLogImpl(this, 'timeLog', label, data);
trace(kTraceInstant, kTraceConsoleCategory, `time::${label}`, 0);
},
trace: function trace(...args) {
const err = {
name: 'Trace',
message: this[kFormatForStderr](args)
};
// eslint-disable-next-line no-restricted-syntax
Error.captureStackTrace(err, trace);
this.error(err.stack);
},
assert(expression, ...args) {
if (!expression) {
args[0] = `Assertion failed${args.length === 0 ? '' : `: ${args[0]}`}`;
this.warn(...args); // The arguments will be formatted in warn() again
}
},
// Defined by: https://console.spec.whatwg.org/#clear
clear() {
// It only makes sense to clear if _stdout is a TTY.
// Otherwise, do nothing.
if (this._stdout.isTTY && process.env.TERM !== 'dumb') {
// The require is here intentionally to avoid readline being
// required too early when console is first loaded.
const { cursorTo, clearScreenDown } = require('readline');
cursorTo(this._stdout, 0, 0);
clearScreenDown(this._stdout);
}
},
// Defined by: https://console.spec.whatwg.org/#count
count(label = 'default') {
// Ensures that label is a string, and only things that can be
// coerced to strings. e.g. Symbol is not allowed
label = `${label}`;
const counts = this[kCounts];
let count = counts.get(label);
if (count === undefined)
count = 1;
else
count++;
counts.set(label, count);
trace(kTraceCount, kTraceConsoleCategory, `count::${label}`, 0, count);
this.log(`${label}: ${count}`);
},
// Defined by: https://console.spec.whatwg.org/#countreset
countReset(label = 'default') {
const counts = this[kCounts];
if (!counts.has(label)) {
process.emitWarning(`Count for '${label}' does not exist`);
return;
}
trace(kTraceCount, kTraceConsoleCategory, `count::${label}`, 0, 0);
counts.delete(`${label}`);
},
group(...data) {
if (data.length > 0) {
this.log(...data);
}
this[kGroupIndent] += ' '.repeat(this[kGroupIndentationWidth]);
},
groupEnd() {
this[kGroupIndent] =
this[kGroupIndent].slice(0, this[kGroupIndent].length -
this[kGroupIndentationWidth]);
},
// https://console.spec.whatwg.org/#table
table(tabularData, properties) {
if (properties !== undefined && !ArrayIsArray(properties))
throw new ERR_INVALID_ARG_TYPE('properties', 'Array', properties);
if (tabularData === null || typeof tabularData !== 'object')
return this.log(tabularData);
if (cliTable === undefined) cliTable = require('internal/cli_table');
const final = (k, v) => this.log(cliTable(k, v));
const _inspect = (v) => {
const depth = v !== null &&
typeof v === 'object' &&
!isArray(v) &&
ObjectKeys(v).length > 2 ? -1 : 0;
const opt = {
depth,
maxArrayLength: 3,
breakLength: Infinity,
...this[kGetInspectOptions](this._stdout)
};
return inspect(v, opt);
};
const getIndexArray = (length) => ArrayFrom(
{ length }, (_, i) => _inspect(i));
const mapIter = isMapIterator(tabularData);
let isKeyValue = false;
let i = 0;
if (mapIter) {
const res = previewEntries(tabularData, true);
tabularData = res[0];
isKeyValue = res[1];
}
if (isKeyValue || isMap(tabularData)) {
const keys = [];
const values = [];
let length = 0;
if (mapIter) {
for (; i < tabularData.length / 2; ++i) {
keys.push(_inspect(tabularData[i * 2]));
values.push(_inspect(tabularData[i * 2 + 1]));
length++;
}
} else {
for (const [k, v] of tabularData) {
keys.push(_inspect(k));
values.push(_inspect(v));
length++;
}
}
return final([
iterKey, keyKey, valuesKey
], [
getIndexArray(length),
keys,
values,
]);
}
const setIter = isSetIterator(tabularData);
if (setIter)
tabularData = previewEntries(tabularData);
const setlike = setIter || mapIter || isSet(tabularData);
if (setlike) {
const values = [];
let length = 0;
for (const v of tabularData) {
values.push(_inspect(v));
length++;
}
return final([iterKey, valuesKey], [getIndexArray(length), values]);
}
const map = {};
let hasPrimitives = false;
const valuesKeyArray = [];
const indexKeyArray = ObjectKeys(tabularData);
for (; i < indexKeyArray.length; i++) {
const item = tabularData[indexKeyArray[i]];
const primitive = item === null ||
(typeof item !== 'function' && typeof item !== 'object');
if (properties === undefined && primitive) {
hasPrimitives = true;
valuesKeyArray[i] = _inspect(item);
} else {
const keys = properties || ObjectKeys(item);
for (const key of keys) {
if (map[key] === undefined)
map[key] = [];
if ((primitive && properties) ||
!ObjectPrototypeHasOwnProperty(item, key))
map[key][i] = '';
else
map[key][i] = _inspect(item[key]);
}
}
}
const keys = ObjectKeys(map);
const values = ObjectValues(map);
if (hasPrimitives) {
keys.push(valuesKey);
values.push(valuesKeyArray);
}
keys.unshift(indexKey);
values.unshift(indexKeyArray);
return final(keys, values);
},
};
// Returns true if label was found
function timeLogImpl(self, name, label, data) {
const time = self._times.get(label);
if (time === undefined) {
process.emitWarning(`No such label '${label}' for console.${name}()`);
return false;
}
const duration = process.hrtime(time);
const ms = duration[0] * 1000 + duration[1] / 1e6;
const formatted = formatTime(ms);
if (data === undefined) {
self.log('%s: %s', label, formatted);
} else {
self.log('%s: %s', label, formatted, ...data);
}
return true;
}
function pad(value) {
return `${value}`.padStart(2, '0');
}
function formatTime(ms) {
let hours = 0;
let minutes = 0;
let seconds = 0;
if (ms >= kSecond) {
if (ms >= kMinute) {
if (ms >= kHour) {
hours = MathFloor(ms / kHour);
ms = ms % kHour;
}
minutes = MathFloor(ms / kMinute);
ms = ms % kMinute;
}
seconds = ms / kSecond;
}
if (hours !== 0 || minutes !== 0) {
[seconds, ms] = seconds.toFixed(3).split('.');
const res = hours !== 0 ? `${hours}:${pad(minutes)}` : minutes;
return `${res}:${pad(seconds)}.${ms} (${hours !== 0 ? 'h:m' : ''}m:ss.mmm)`;
}
if (seconds !== 0) {
return `${seconds.toFixed(3)}s`;
}
return `${Number(ms.toFixed(3))}ms`;
}
const keyKey = 'Key';
const valuesKey = 'Values';
const indexKey = '(index)';
const iterKey = '(iteration index)';
const isArray = (v) => ArrayIsArray(v) || isTypedArray(v) || isBuffer(v);
function noop() {}
for (const method of ReflectOwnKeys(consoleMethods))
Console.prototype[method] = consoleMethods[method];
Console.prototype.debug = Console.prototype.log;
Console.prototype.info = Console.prototype.log;
Console.prototype.dirxml = Console.prototype.log;
Console.prototype.error = Console.prototype.warn;
Console.prototype.groupCollapsed = Console.prototype.group;
module.exports = {
Console,
kBindStreamsLazy,
kBindProperties,
formatTime // exported for tests
};