[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | /* eslint-disable
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| 4 | arrow-parens,
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| 5 | multiline-ternary,
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| 6 | consistent-return,
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| 7 | no-param-reassign,
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| 8 | prefer-destructuring
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| 9 | */
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| 10 | const noop = () => {};
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| 11 |
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| 12 | const levels = Symbol('levels');
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| 13 | const instance = Symbol('instance');
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| 14 |
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| 15 | class MethodFactory {
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| 16 | constructor(logger) {
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| 17 | this[levels] = {
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| 18 | TRACE: 0,
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| 19 | DEBUG: 1,
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| 20 | INFO: 2,
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| 21 | WARN: 3,
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| 22 | ERROR: 4,
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| 23 | SILENT: 5
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| 24 | };
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| 25 |
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| 26 | this[instance] = logger;
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| 27 | }
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| 28 |
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| 29 | set logger(logger) {
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| 30 | this[instance] = logger;
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| 31 | }
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| 32 |
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| 33 | get logger() {
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| 34 | return this[instance];
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| 35 | }
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| 36 |
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| 37 | get levels() {
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| 38 | return this[levels];
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| 39 | }
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| 40 |
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| 41 | get methods() {
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| 42 | return Object.keys(this.levels)
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| 43 | .map((key) => key.toLowerCase())
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| 44 | .filter((key) => key !== 'silent');
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| 45 | }
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| 46 |
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| 47 | distillLevel(level) {
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| 48 | let result = level;
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| 49 |
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| 50 | if (
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| 51 | typeof result === 'string' &&
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| 52 | typeof this.levels[result.toUpperCase()] !== 'undefined'
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| 53 | ) {
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| 54 | result = this.levels[result.toUpperCase()];
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| 55 | }
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| 56 |
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| 57 | if (this.levelValid(result)) {
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| 58 | return result;
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| 59 | }
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| 60 | }
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| 61 |
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| 62 | levelValid(level) {
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| 63 | if (
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| 64 | typeof level === 'number' && level >= 0 &&
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| 65 | level <= this.levels.SILENT
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| 66 | ) {
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| 67 | return true;
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| 68 | }
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| 69 |
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| 70 | return false;
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| 71 | }
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| 72 | /**
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| 73 | * Build the best logging method possible for this env
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| 74 | * Wherever possible we want to bind, not wrap, to preserve stack traces.
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| 75 | * Since we're targeting modern browsers, there's no need to wait for the
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| 76 | * console to become available.
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| 77 | */
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| 78 | // eslint-disable-next-line class-methods-use-this
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| 79 | make(method) {
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| 80 | if (method === 'debug') {
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| 81 | method = 'log';
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| 82 | }
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| 83 |
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| 84 | /* eslint-disable no-console */
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| 85 | if (typeof console[method] !== 'undefined') {
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| 86 | return this.bindMethod(console, method);
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| 87 | } else if (typeof console.log !== 'undefined') {
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| 88 | return this.bindMethod(console, 'log');
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| 89 | }
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| 90 |
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| 91 | /* eslint-enable no-console */
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| 92 | return noop;
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| 93 | }
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| 94 |
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| 95 | // eslint-disable-next-line class-methods-use-this
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| 96 | bindMethod(obj, name) {
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| 97 | const method = obj[name];
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| 98 |
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| 99 | if (typeof method.bind === 'function') {
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| 100 | return method.bind(obj);
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| 101 | }
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| 102 |
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| 103 | try {
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| 104 | return Function.prototype.bind.call(method, obj);
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| 105 | } catch (err) {
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| 106 | // Missing bind shim or IE8 + Modernizr, fallback to wrapping
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| 107 | return function result() {
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| 108 | // eslint-disable-next-line prefer-rest-params
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| 109 | return Function.prototype.apply.apply(method, [obj, arguments]);
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| 110 | };
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| 111 | }
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| 112 | }
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| 113 |
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| 114 | replaceMethods(logLevel) {
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| 115 | const level = this.distillLevel(logLevel);
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| 116 |
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| 117 | if (level == null) {
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| 118 | throw new Error(
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| 119 | `loglevel: replaceMethods() called with invalid level: ${logLevel}`
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| 120 | );
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| 121 | }
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| 122 |
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| 123 | if (!this.logger || this.logger.type !== 'LogLevel') {
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| 124 | throw new TypeError(
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| 125 | 'loglevel: Logger is undefined or invalid. Please specify a valid Logger instance.'
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| 126 | );
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| 127 | }
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| 128 |
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| 129 | this.methods.forEach((method) => {
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| 130 | this.logger[method] = (this.levels[method.toUpperCase()] < level)
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| 131 | ? noop
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| 132 | : this.make(method);
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| 133 | });
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| 134 |
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| 135 | // Define log.log as an alias for log.debug
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| 136 | this.logger.log = this.logger.debug;
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| 137 | }
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| 138 | }
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| 139 |
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| 140 | module.exports = MethodFactory;
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