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/**

* This is the web browser implementation of `debug()`.

*

* Expose `debug()` as the module.

*/

exports = module.exports = require('./debug');

exports.log = log;

exports.formatArgs = formatArgs;

exports.save = save;

exports.load = load;

exports.useColors = useColors;

exports.storage = 'undefined' != typeof chrome

&& 'undefined' != typeof chrome.storage

? chrome.storage.local

: localstorage();

/**

* Colors.

*/

exports.colors = [

'lightseagreen',

'forestgreen',

'goldenrod',

'dodgerblue',

'darkorchid',

'crimson'

];

/**

* Currently only WebKit-based Web Inspectors, Firefox >= v31,

* and the Firebug extension (any Firefox version) are known

* to support "%c" CSS customizations.

*

* TODO: add a `localStorage` variable to explicitly enable/disable colors

*/

function useColors() {

// is webkit? http://stackoverflow.com/a/16459606/376773

return ('WebkitAppearance' in document.documentElement.style) ||

// is firebug? http://stackoverflow.com/a/398120/376773

(window.console && (console.firebug || (console.exception && console.table))) ||

// is firefox >= v31?

// https://developer.mozilla.org/en-US/docs/Tools/Web_Console#Styling_messages

(navigator.userAgent.toLowerCase().match(/firefox\/(\d+)/) && parseInt(RegExp.$1, 10) >= 31);

}

/**

* Map %j to `JSON.stringify()`, since no Web Inspectors do that by default.

*/

exports.formatters.j = function(v) {

return JSON.stringify(v);

};

/**

* Colorize log arguments if enabled.

*

* @api public

*/

function formatArgs() {

var args = arguments;

var useColors = this.useColors;

args[0] = (useColors ? '%c' : '')

+ this.namespace

+ (useColors ? ' %c' : ' ')

+ args[0]

+ (useColors ? '%c ' : ' ')

+ '+' + exports.humanize(this.diff);

if (!useColors) return args;

var c = 'color: ' + this.color;

args = [args[0], c, 'color: inherit'].concat(Array.prototype.slice.call(args, 1));

// the final "%c" is somewhat tricky, because there could be other

// arguments passed either before or after the %c, so we need to

// figure out the correct index to insert the CSS into

var index = 0;

var lastC = 0;

args[0].replace(/%[a-z%]/g, function(match) {

if ('%%' === match) return;

index++;

if ('%c' === match) {

// we only are interested in the *last* %c

// (the user may have provided their own)

lastC = index;

}

});

args.splice(lastC, 0, c);

return args;

}

/**

* Invokes `console.log()` when available.

* No-op when `console.log` is not a "function".

*

* @api public

*/

function log() {

// this hackery is required for IE8/9, where

// the `console.log` function doesn't have 'apply'

return 'object' === typeof console

&& console.log

&& Function.prototype.apply.call(console.log, console, arguments);

}

/**

* Save `namespaces`.

*

* @param {String} namespaces

* @api private

*/

function save(namespaces) {

try {

if (null == namespaces) {

exports.storage.removeItem('debug');

} else {

exports.storage.debug = namespaces;

}

} catch(e) {}

}

/**

* Load `namespaces`.

*

* @return {String} returns the previously persisted debug modes

* @api private

*/

function load() {

var r;

try {

r = exports.storage.debug;

} catch(e) {}

return r;

}

/**

* Enable namespaces listed in `localStorage.debug` initially.

*/

exports.enable(load());

/**

* Localstorage attempts to return the localstorage.

*

* This is necessary because safari throws

* when a user disables cookies/localstorage

* and you attempt to access it.

*

* @return {LocalStorage}

* @api private

*/

function localstorage(){

try {

return window.localStorage;

} catch (e) {}

}