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debug
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debug.js
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/** * This is the common logic for both the Node.js and web browser * implementations of `debug()`. * * Expose `debug()` as the module. */ exports = module.exports = createDebug.debug = createDebug['default'] = createDebug; exports.coerce = coerce; exports.disable = disable; exports.enable = enable; exports.enabled = enabled; exports.humanize = require('ms'); /** * Active `debug` instances. */ exports.instances = []; /** * The currently active debug mode names, and names to skip. */ exports.names = []; exports.skips = []; /** * Map of special "%n" handling functions, for the debug "format" argument. * * Valid key names are a single, lower or upper-case letter, i.e. "n" and "N". */ exports.formatters = {}; /** * Select a color. * @param {String} namespace * @return {Number} * @api private */ function selectColor(namespace) { var hash = 0, i; for (i in namespace) { hash = ((hash << 5) - hash) + namespace.charCodeAt(i); hash |= 0; // Convert to 32bit integer } return exports.colors[Math.abs(hash) % exports.colors.length]; } /** * Create a debugger with the given `namespace`. * * @param {String} namespace * @return {Function} * @api public */ function createDebug(namespace) { var prevTime; function debug() { // disabled? if (!debug.enabled) return; var self = debug; // set `diff` timestamp var curr = +new Date(); var ms = curr - (prevTime || curr); self.diff = ms; self.prev = prevTime; self.curr = curr; prevTime = curr; // turn the `arguments` into a proper Array var args = new Array(arguments.length); for (var i = 0; i < args.length; i++) { args[i] = arguments[i]; } args[0] = exports.coerce(args[0]); if ('string' !== typeof args[0]) { // anything else let's inspect with %O args.unshift('%O'); } // apply any `formatters` transformations var index = 0; args[0] = args[0].replace(/%([a-zA-Z%])/g, function(match, format) { // if we encounter an escaped % then don't increase the array index if (match === '%%') return match; index++; var formatter = exports.formatters[format]; if ('function' === typeof formatter) { var val = args[index]; match = formatter.call(self, val); // now we need to remove `args[index]` since it's inlined in the `format` args.splice(index, 1); index--; } return match; }); // apply env-specific formatting (colors, etc.) exports.formatArgs.call(self, args); var logFn = debug.log || exports.log || console.log.bind(console); logFn.apply(self, args); } debug.namespace = namespace; debug.enabled = exports.enabled(namespace); debug.useColors = exports.useColors(); debug.color = selectColor(namespace); debug.destroy = destroy; // env-specific initialization logic for debug instances if ('function' === typeof exports.init) { exports.init(debug); } exports.instances.push(debug); return debug; } function destroy () { var index = exports.instances.indexOf(this); if (index !== -1) { exports.instances.splice(index, 1); return true; } else { return false; } } /** * Enables a debug mode by namespaces. This can include modes * separated by a colon and wildcards. * * @param {String} namespaces * @api public */ function enable(namespaces) { exports.save(namespaces); exports.names = []; exports.skips = []; var i; var split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/); var len = split.length; for (i = 0; i < len; i++) { if (!split[i]) continue; // ignore empty strings namespaces = split[i].replace(/\*/g, '.*?'); if (namespaces[0] === '-') { exports.skips.push(new RegExp('^' + namespaces.substr(1) + '$')); } else { exports.names.push(new RegExp('^' + namespaces + '$')); } } for (i = 0; i < exports.instances.length; i++) { var instance = exports.instances[i]; instance.enabled = exports.enabled(instance.namespace); } } /** * Disable debug output. * * @api public */ function disable() { exports.enable(''); } /** * Returns true if the given mode name is enabled, false otherwise. * * @param {String} name * @return {Boolean} * @api public */ function enabled(name) { if (name[name.length - 1] === '*') { return true; } var i, len; for (i = 0, len = exports.skips.length; i < len; i++) { if (exports.skips[i].test(name)) { return false; } } for (i = 0, len = exports.names.length; i < len; i++) { if (exports.names[i].test(name)) { return true; } } return false; } /** * Coerce `val`. * * @param {Mixed} val * @return {Mixed} * @api private */ function coerce(val) { if (val instanceof Error) return val.stack || val.message; return val; }