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