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common.js

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/**

* This is the common logic for both the Node.js and web browser

* implementations of `debug()`.

*/

function setup(env) {

createDebug.debug = createDebug;

createDebug.default = createDebug;

createDebug.coerce = coerce;

createDebug.disable = disable;

createDebug.enable = enable;

createDebug.enabled = enabled;

createDebug.humanize = require('ms');

Object.keys(env).forEach(key => {

createDebug[key] = env[key];

});

/**

* Active `debug` instances.

*/

createDebug.instances = [];

/**

* The currently active debug mode names, and names to skip.

*/

createDebug.names = [];

createDebug.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".

*/

createDebug.formatters = {};

/**

* Selects a color for a debug namespace

* @param {String} namespace The namespace string for the for the debug instance to be colored

* @return {Number|String} An ANSI color code for the given namespace

* @api private

*/

function selectColor(namespace) {

let hash = 0;

for (let i = 0; i < namespace.length; i++) {

hash = ((hash << 5) - hash) + namespace.charCodeAt(i);

hash |= 0; // Convert to 32bit integer

}

return createDebug.colors[Math.abs(hash) % createDebug.colors.length];

}

createDebug.selectColor = selectColor;

/**

* Create a debugger with the given `namespace`.

*

* @param {String} namespace

* @return {Function}

* @api public

*/

function createDebug(namespace) {

let prevTime;

function debug(...args) {

// Disabled?

if (!debug.enabled) {

return;

}

const self = debug;

// Set `diff` timestamp

const curr = Number(new Date());

const ms = curr - (prevTime || curr);

self.diff = ms;

self.prev = prevTime;

self.curr = curr;

prevTime = curr;

args[0] = createDebug.coerce(args[0]);

if (typeof args[0] !== 'string') {

// Anything else let's inspect with %O

args.unshift('%O');

}

// Apply any `formatters` transformations

let index = 0;

args[0] = args[0].replace(/%([a-zA-Z%])/g, (match, format) => {

// If we encounter an escaped % then don't increase the array index

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

return match;

}

index++;

const formatter = createDebug.formatters[format];

if (typeof formatter === 'function') {

const 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.)

createDebug.formatArgs.call(self, args);

const logFn = self.log || createDebug.log;

logFn.apply(self, args);

}

debug.namespace = namespace;

debug.enabled = createDebug.enabled(namespace);

debug.useColors = createDebug.useColors();

debug.color = selectColor(namespace);

debug.destroy = destroy;

debug.extend = extend;

// Debug.formatArgs = formatArgs;

// debug.rawLog = rawLog;

// env-specific initialization logic for debug instances

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

createDebug.init(debug);

}

createDebug.instances.push(debug);

return debug;

}

function destroy() {

const index = createDebug.instances.indexOf(this);

if (index !== -1) {

createDebug.instances.splice(index, 1);

return true;

}

return false;

}

function extend(namespace, delimiter) {

const newDebug = createDebug(this.namespace + (typeof delimiter === 'undefined' ? ':' : delimiter) + namespace);

newDebug.log = this.log;

return newDebug;

}

/**

* Enables a debug mode by namespaces. This can include modes

* separated by a colon and wildcards.

*

* @param {String} namespaces

* @api public

*/

function enable(namespaces) {

createDebug.save(namespaces);

createDebug.names = [];

createDebug.skips = [];

let i;

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

const len = split.length;

for (i = 0; i < len; i++) {

if (!split[i]) {

// ignore empty strings

continue;

}

namespaces = split[i].replace(/\*/g, '.*?');

if (namespaces[0] === '-') {

createDebug.skips.push(new RegExp('^' + namespaces.substr(1) + '$'));

} else {

createDebug.names.push(new RegExp('^' + namespaces + '$'));

}

}

for (i = 0; i < createDebug.instances.length; i++) {

const instance = createDebug.instances[i];

instance.enabled = createDebug.enabled(instance.namespace);

}

}

/**

* Disable debug output.

*

* @return {String} namespaces

* @api public

*/

function disable() {

const namespaces = [

...createDebug.names.map(toNamespace),

...createDebug.skips.map(toNamespace).map(namespace => '-' + namespace)

].join(',');

createDebug.enable('');

return namespaces;

}

/**

* 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;

}

let i;

let len;

for (i = 0, len = createDebug.skips.length; i < len; i++) {

if (createDebug.skips[i].test(name)) {

return false;

}

}

for (i = 0, len = createDebug.names.length; i < len; i++) {

if (createDebug.names[i].test(name)) {

return true;

}

}

return false;

}

/**

* Convert regexp to namespace

*

* @param {RegExp} regxep

* @return {String} namespace

* @api private

*/

function toNamespace(regexp) {

return regexp.toString()

.substring(2, regexp.toString().length - 2)

.replace(/\.\*\?$/, '*');

}

/**

* Coerce `val`.

*

* @param {Mixed} val

* @return {Mixed}

* @api private

*/

function coerce(val) {

if (val instanceof Error) {

return val.stack || val.message;

}

return val;

}

createDebug.enable(createDebug.load());

return createDebug;

}

module.exports = setup;