Simple library to log to the storage, granting the possibility of viewing the log after the URL changes
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/461057/1156386/LateLog%20-%20Simple%20storage-based%20Log%20Library.js
// ==UserScript==
// @name LateLog - Simple storage-based Log Library
// @namespace satology.latelog
// @version 0.2
// @description Simple library to log to the storage, granting the possibility of viewing the log after the URL changes
// @author satology
// @grant GM_getValue
// @grant GM_setValue
// @grant GM_registerMenuCommand
// ==/UserScript==
var LateLog = (function() {
'use strict';
const latelog_getDateTimeString = (date = new Date()) => `${('' + date.getUTCFullYear()).slice(-2)}-${('0' + date.getUTCMonth()).slice(-2)}-${('0' + date.getUTCDate()).slice(-2)} ${('0' + date.getUTCHours()).slice(-2)}:${('0' + date.getUTCMinutes()).slice(-2)}:${('0' + date.getUTCSeconds()).slice(-2)}`;
class Storage {
constructor(prefix = '', config = {}) {
this.prefix = prefix;
this.config = config;
}
write(key, value, parseIt = false) {
GM_setValue(this.prefix + key, parseIt ? JSON.stringify(value) : value);
}
read(key, parseIt = false) {
let value = GM_getValue(this.prefix + key);
if(value && parseIt) {
value = JSON.parse(value);
}
return value;
}
}
class LateLog {
constructor(options = {}) {
if(!this._isValidSetup(options)) return;
this.storage = new Storage();
this.options = {
level: 5,
maxLines: 200,
addTimestamp: true,
printWhileLogging: false,
// showDisplayButton: true,
...options
};
this._init();
}
_isValidSetup(options) {
if(! (typeof GM_getValue === "function" &&
typeof GM_setValue === "function" &&
typeof GM_registerMenuCommand === "function") ) {
console.warn(
`LateLog cannot be initialized - At least one off the following @grant is missing in your script:
@grant GM_getValue
@grant GM_setValue
@grant GM_registerMenuCommand`);
return false;
}
// TODO: validate options
return true;
}
_init() {
let that = this;
GM_registerMenuCommand('View log', function(evt) {
console.log('Printing LateLog');
that.display();
});
return true;
}
_write(msg, msgLevel = 1) {
if (this.options.level < msgLevel) {
return;
}
let log = this.storage.read('log', true);
log = log ? log : [];
if (msg === null) {
msg = 'null';
}
if (msg === undefined) {
msg = 'undefined';
}
let savable = {
lvl: msgLevel
};
if (this.options.addTimestamp) {
savable.ts = `${latelog_getDateTimeString()}`;
}
if (msg instanceof Error) {
savable.msg = msg.toString();
} else if (typeof(msg) == 'object') {
savable.msg = JSON.stringify(msg);
savable.parse = true;
} else {
savable.msg = msg;
}
log.push(savable);
if(log.length > this.options.maxLines) {
log.splice(0, log.length - this.options.maxLines);
}
this.storage.write('log', log, true);
this._formatPrint(savable);
}
_getPrintFn(level) {
switch(level) {
case 1:
return console.log;
case 2:
return console.info;
case 3:
return console.debug;
case 4:
return console.warn;
case 5:
return console.error;
default:
return console.log;
}
}
_formatPrint(x) {
if (x.parse) {
try {
x.msg = JSON.parse(x.msg);
} catch (err) {}
if (this.options.addTimestamp) {
this._getPrintFn(x.lvl)(`${x.ts}:`);
}
this._getPrintFn(x.lvl)(x.msg);
} else {
this._getPrintFn(x.lvl)(`${this.options.addTimestamp ? x.ts + ' ' : ''} ${x.msg}`);
}
}
clear() { this.storage.write('log', [], true); }
display() {
let log = this.storage.read('log', true);
if(!log) {
console.log('LateLog - Nothing to show')
return;
}
log.forEach(x => {
this._formatPrint(x);
});
}
log(msg) { this._write(msg, 1); }
info(msg) { this._write(msg, 2); }
debug(msg) { this._write(msg, 3); }
warn(msg) { this._write(msg, 4); }
error(msg) { this._write(msg, 5); }
}
return LateLog;
})();