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