diff options
Diffstat (limited to 'node_modules/debug/src/debug.js')
-rw-r--r-- | node_modules/debug/src/debug.js | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/node_modules/debug/src/debug.js b/node_modules/debug/src/debug.js new file mode 100644 index 0000000..6a5e3fc --- /dev/null +++ b/node_modules/debug/src/debug.js @@ -0,0 +1,202 @@ + +/** + * 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; +} |