A filter framework.
This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/441383/1027327/SimpleFilter.js
// ==UserScript==
// @name SimpleFilter
// @namespace ckylin-script-lib-filter-processor
// @version 1.0
// @match http://*
// @match https://*
// @author CKylinMC
// @license GPLv3 License
// @grant none
// ==/UserScript==
class SimpleFilter{
static debug = true;
static log = (...args)=>SimpleFilter.debug&&SimpleFilter.logger(...args);
constructor(filterObj){
if(!SimpleFilter.verify(filterObj)) {
throw new Error("filter is invalid, turn on debug mode to see the details.");
}
this.filterObj = filterObj;
this.datas = null;
}
static logger(...args){
console.log("[Filter]",...args);
}
static async $and(...conditions){
for(const condition of conditions){
if(condition instanceof Promise){
if(!(await condition)) return false;
}
if(!condition) return false;
}
return true;
}
static async $or(...conditions){
for(const condition of conditions){
if(condition instanceof Promise){
if(await condition) return false;
}
if(condition) return true;
}
return false;
}
static verify(obj, depth=0, isroot=true){
SimpleFilter.log('-'.repeat(depth+1)+'>','start validate',obj);
if(Array.isArray(obj)){
SimpleFilter.log('-'.repeat(depth+1)+'>','type: arr',obj);
for(const item of obj){
if(!SimpleFilter.verify(item, depth+1, false)) return (SimpleFilter.log('-'.repeat(depth+1)+'>','[ERR]','array validator not passed for',item),false);
}
}else if(typeof(obj)=='function') return (SimpleFilter.log('-'.repeat(depth+1)+'>','[OK]','passed due to function type',obj),true);
else{
SimpleFilter.log('-'.repeat(depth+1)+'>','type: logic selector',obj);
const keys = Object.keys(obj);
if(isroot&&keys.length!==1) return (SimpleFilter.log('-'.repeat(depth+1)+'>','[ERR]','subkey length validator not passed for', keys), false);
for(const k of keys){
if(["$and","$or"].includes(k.toLowerCase())){
if(!SimpleFilter.verify(obj[k], depth+1, false)) return (SimpleFilter.log('-'.repeat(depth+1)+'>','[ERR]','value validator not passed for', k), false);
}else return (SimpleFilter.log('-'.repeat(depth+1)+'>','[ERR]','key validator not passed for', k),false);
}
}
SimpleFilter.log('-'.repeat(depth+1)+'>','[OK]','passed',obj);
return true;
}
async applyFilterToAll(datas=[]){
try{
let pool = datas.map(data=>this.applyFilterTo(data));
return Promise.all(pool);
}catch(e){
return null;
}
}
async applyFilterTo(data=null){
if(!SimpleFilter.verify(this.filterObj)) return false;
this.data = data;
try{
return await this.applyFilter(this.filterObj);
}
catch(e){
SimpleFilter.log('[ERR]',e);
return false;
}
finally{
this.data = null;
}
}
async applyFilter(obj, mode = '$and'){
if(Array.isArray(obj)){
for(const item of obj){
return this.applyFilter(item);
}
}else if(typeof(obj)=='function'){
if(obj.constructor.name=='AsyncFunction'){
try{
return !!(await obj(this.data));
}catch(e){
SimpleFilter.log('[ERR]',e);
return false;
}
}else{
try{
return !!obj(this.data);
}catch(e){
SimpleFilter.log('[ERR]',e);
return false;
}
}
}else{
const keys = Object.keys(obj);
try{
return await SimpleFilter[mode](...keys.map(async k=>{
return await this.applyFilter(obj[k],k);
}));
}catch(e){
SimpleFilter.log('[ERR]',e);
return false;
}
}
}
}