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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');

/**

* 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 = {};

/**

* Previous log timestamp.

*/

var prevTime;

/**

* 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) {

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);

// env-specific initialization logic for debug instances

if ('function' === typeof exports.init) {

exports.init(debug);

}

return debug;

}

/**

* 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 split = (typeof namespaces === 'string' ? namespaces : '').split(/[\s,]+/);

var len = split.length;

for (var 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 + '$'));

}

}

}

/**

* 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) {

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;

}