'use strict';
|
|
/* eslint-disable
|
arrow-parens,
|
multiline-ternary,
|
consistent-return,
|
no-param-reassign,
|
prefer-destructuring
|
*/
|
const noop = () => {};
|
|
const levels = Symbol('levels');
|
const instance = Symbol('instance');
|
|
class MethodFactory {
|
constructor(logger) {
|
this[levels] = {
|
TRACE: 0,
|
DEBUG: 1,
|
INFO: 2,
|
WARN: 3,
|
ERROR: 4,
|
SILENT: 5
|
};
|
|
this[instance] = logger;
|
}
|
|
set logger(logger) {
|
this[instance] = logger;
|
}
|
|
get logger() {
|
return this[instance];
|
}
|
|
get levels() {
|
return this[levels];
|
}
|
|
get methods() {
|
return Object.keys(this.levels)
|
.map((key) => key.toLowerCase())
|
.filter((key) => key !== 'silent');
|
}
|
|
distillLevel(level) {
|
let result = level;
|
|
if (
|
typeof result === 'string' &&
|
typeof this.levels[result.toUpperCase()] !== 'undefined'
|
) {
|
result = this.levels[result.toUpperCase()];
|
}
|
|
if (this.levelValid(result)) {
|
return result;
|
}
|
}
|
|
levelValid(level) {
|
if (
|
typeof level === 'number' && level >= 0 &&
|
level <= this.levels.SILENT
|
) {
|
return true;
|
}
|
|
return false;
|
}
|
/**
|
* Build the best logging method possible for this env
|
* Wherever possible we want to bind, not wrap, to preserve stack traces.
|
* Since we're targeting modern browsers, there's no need to wait for the
|
* console to become available.
|
*/
|
// eslint-disable-next-line class-methods-use-this
|
make(method) {
|
if (method === 'debug') {
|
method = 'log';
|
}
|
|
/* eslint-disable no-console */
|
if (typeof console[method] !== 'undefined') {
|
return this.bindMethod(console, method);
|
} else if (typeof console.log !== 'undefined') {
|
return this.bindMethod(console, 'log');
|
}
|
|
/* eslint-enable no-console */
|
return noop;
|
}
|
|
// eslint-disable-next-line class-methods-use-this
|
bindMethod(obj, name) {
|
const method = obj[name];
|
|
if (typeof method.bind === 'function') {
|
return method.bind(obj);
|
}
|
|
try {
|
return Function.prototype.bind.call(method, obj);
|
} catch (err) {
|
// Missing bind shim or IE8 + Modernizr, fallback to wrapping
|
return function result() {
|
// eslint-disable-next-line prefer-rest-params
|
return Function.prototype.apply.apply(method, [obj, arguments]);
|
};
|
}
|
}
|
|
replaceMethods(logLevel) {
|
const level = this.distillLevel(logLevel);
|
|
if (level == null) {
|
throw new Error(
|
`loglevel: replaceMethods() called with invalid level: ${logLevel}`
|
);
|
}
|
|
if (!this.logger || this.logger.type !== 'LogLevel') {
|
throw new TypeError(
|
'loglevel: Logger is undefined or invalid. Please specify a valid Logger instance.'
|
);
|
}
|
|
this.methods.forEach((method) => {
|
this.logger[method] = (this.levels[method.toUpperCase()] < level)
|
? noop
|
: this.make(method);
|
});
|
|
// Define log.log as an alias for log.debug
|
this.logger.log = this.logger.debug;
|
}
|
}
|
|
module.exports = MethodFactory;
|
