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node.js4.6 KB · 264 lines
/** * Module dependencies. */ const tty = require('tty');const util = require('util'); /** * This is the Node.js implementation of `debug()`. */ exports.init = init;exports.log = log;exports.formatArgs = formatArgs;exports.save = save;exports.load = load;exports.useColors = useColors;exports.destroy = util.deprecate(	() => {},	'Instance method `debug.destroy()` is deprecated and no longer does anything. It will be removed in the next major version of `debug`.'); /** * Colors. */ exports.colors = [6, 2, 3, 4, 5, 1]; try {	// Optional dependency (as in, doesn't need to be installed, NOT like optionalDependencies in package.json)	// eslint-disable-next-line import/no-extraneous-dependencies	const supportsColor = require('supports-color'); 	if (supportsColor && (supportsColor.stderr || supportsColor).level >= 2) {		exports.colors = [			20,			21,			26,			27,			32,			33,			38,			39,			40,			41,			42,			43,			44,			45,			56,			57,			62,			63,			68,			69,			74,			75,			76,			77,			78,			79,			80,			81,			92,			93,			98,			99,			112,			113,			128,			129,			134,			135,			148,			149,			160,			161,			162,			163,			164,			165,			166,			167,			168,			169,			170,			171,			172,			173,			178,			179,			184,			185,			196,			197,			198,			199,			200,			201,			202,			203,			204,			205,			206,			207,			208,			209,			214,			215,			220,			221		];	}} catch (error) {	// Swallow - we only care if `supports-color` is available; it doesn't have to be.} /** * Build up the default `inspectOpts` object from the environment variables. * *   $ DEBUG_COLORS=no DEBUG_DEPTH=10 DEBUG_SHOW_HIDDEN=enabled node script.js */ exports.inspectOpts = Object.keys(process.env).filter(key => {	return /^debug_/i.test(key);}).reduce((obj, key) => {	// Camel-case	const prop = key		.substring(6)		.toLowerCase()		.replace(/_([a-z])/g, (_, k) => {			return k.toUpperCase();		}); 	// Coerce string value into JS value	let val = process.env[key];	if (/^(yes|on|true|enabled)$/i.test(val)) {		val = true;	} else if (/^(no|off|false|disabled)$/i.test(val)) {		val = false;	} else if (val === 'null') {		val = null;	} else {		val = Number(val);	} 	obj[prop] = val;	return obj;}, {}); /** * Is stdout a TTY? Colored output is enabled when `true`. */ function useColors() {	return 'colors' in exports.inspectOpts ?		Boolean(exports.inspectOpts.colors) :		tty.isatty(process.stderr.fd);} /** * Adds ANSI color escape codes if enabled. * * @api public */ function formatArgs(args) {	const {namespace: name, useColors} = this; 	if (useColors) {		const c = this.color;		const colorCode = '\u001B[3' + (c < 8 ? c : '8;5;' + c);		const prefix = `  ${colorCode};1m${name} \u001B[0m`; 		args[0] = prefix + args[0].split('\n').join('\n' + prefix);		args.push(colorCode + 'm+' + module.exports.humanize(this.diff) + '\u001B[0m');	} else {		args[0] = getDate() + name + ' ' + args[0];	}} function getDate() {	if (exports.inspectOpts.hideDate) {		return '';	}	return new Date().toISOString() + ' ';} /** * Invokes `util.formatWithOptions()` with the specified arguments and writes to stderr. */ function log(...args) {	return process.stderr.write(util.formatWithOptions(exports.inspectOpts, ...args) + '\n');} /** * Save `namespaces`. * * @param {String} namespaces * @api private */function save(namespaces) {	if (namespaces) {		process.env.DEBUG = namespaces;	} else {		// If you set a process.env field to null or undefined, it gets cast to the		// string 'null' or 'undefined'. Just delete instead.		delete process.env.DEBUG;	}} /** * Load `namespaces`. * * @return {String} returns the previously persisted debug modes * @api private */ function load() {	return process.env.DEBUG;} /** * Init logic for `debug` instances. * * Create a new `inspectOpts` object in case `useColors` is set * differently for a particular `debug` instance. */ function init(debug) {	debug.inspectOpts = {}; 	const keys = Object.keys(exports.inspectOpts);	for (let i = 0; i < keys.length; i++) {		debug.inspectOpts[keys[i]] = exports.inspectOpts[keys[i]];	}} module.exports = require('./common')(exports); const {formatters} = module.exports; /** * Map %o to `util.inspect()`, all on a single line. */ formatters.o = function (v) {	this.inspectOpts.colors = this.useColors;	return util.inspect(v, this.inspectOpts)		.split('\n')		.map(str => str.trim())		.join(' ');}; /** * Map %O to `util.inspect()`, allowing multiple lines if needed. */ formatters.O = function (v) {	this.inspectOpts.colors = this.useColors;	return util.inspect(v, this.inspectOpts);};