// ==UserScript==
// @name         b站低质弹幕过滤 测试版 bilibili 哔哩哔哩
// @namespace    http://tampermonkey.net/
// @version      0.0.3
// @description  低质弹幕屏蔽测试版，屏蔽无意义的弹幕如“哈哈哈哈”，刷屏弹幕如“完结撒花”。随便写的脚本，虽然搞过nlp，但都是语义建模，很少接触表达建模，而且js也不循序太高的复杂度，所以目前用的是简单测词频法，后续还会慢慢优化。
// @author       You
// @match        https://www.bilibili.com/video/*
// @grant        none
// ==/UserScript==
function GET(url,fun=function(x){console.log(x.responseText)}){
const xhr = new XMLHttpRequest()
xhr.open('get',url)
xhr.send()
xhr.onreadystatechange = function(){
if(xhr.readyState == 4 && xhr.status == 200){
fun(xhr)
}
}
}
(function() {
'use strict';
const cid = window.__INITIAL_STATE__.videoData.cid
console.log('video cid',cid)
const danmuURL = 'https://api.bilibili.com/x/v1/dm/list.so?oid='+cid
console.log('danmu url:',danmuURL)
const k = 5  //屏蔽强度 1~10，10最强
GET(danmuURL,function(xhr){
const xml = xhr.responseXML
xml.getElementsByTagName('d')
const danmuList = []
for(let d of xml.getElementsByTagName('d')){
const danmu = d.textContent.replace(/[~!@#$(),.?''""！（），。？“”‘’；：;: +-=\\、·…]/g,'').toLowerCase()
if(!!danmu){
danmuList.push(danmu+'#')
}
}
console.log(danmuList)
const char_dict = {}
const word_dict = {}
let total_char = 0
for(let danmu of danmuList){
for(let i=0;i<danmu.length-1;i++){
const cc = danmu[i]
const nc = danmu[i+1]
if(!(cc in char_dict)){
char_dict[cc] = 0
}
if(!(cc in word_dict)){
word_dict[cc] = {'total':0}
}
if(!(nc in word_dict[cc])){
word_dict[cc][nc] = 0
}
char_dict[cc] += 1
word_dict[cc][nc] += 1
word_dict[cc]['total'] += 1
total_char += 1
}
}
for(let c in char_dict){
char_dict[c] = char_dict[c]/total_char
}
console.log('char dict',char_dict)
for(let cc in word_dict){
let total_nc = word_dict[cc].total
for(let nc in word_dict[cc]){
word_dict[cc][nc] = char_dict[cc]*word_dict[cc][nc] / total_nc
}
}
let danmuFreqList = []
for(let danmu of danmuList){
let freq = 0
for(let i = 0;i < danmu.length -1;i++){
freq += word_dict[danmu[i]][danmu[i+1]]
}
freq /= danmu.length-1
danmuFreqList.push([danmu,freq])
}
danmuFreqList = danmuFreqList.sort(function(a,b){
return b[1] - a[1]
})
const size = parseInt(danmuList.length * k / 10)
const removed_danmu = new Set()
for(let i =0;i<size;i++){
removed_danmu.add(danmuFreqList[i][0].substring(0,danmuFreqList[i][0].length-1))
}
console.log('danmu  freq list',danmuFreqList)
console.log('removed danmu list',removed_danmu)
function addOBS(){
const container = document.getElementsByClassName('bilibili-player-video-danmaku')[0]
if(container){
const init_danmu = container.getElementsByClassName('b-danmaku')
for(let danmu of init_danmu){
if(removed_danmu.has(danmu.innerText.replace(/[~!@#$(),.?''""！（），。？“”‘’；：;: +-=\\、·…]/g,'').toLowerCase())){
console.log('屏蔽',danmu.innerText)
danmu.innerText = ''
}
}
function obsFunc(mutations,observer){
for(let mutation of mutations){
const target = mutation.target
if('b-danmaku' == target.className){
if(removed_danmu.has(target.innerText.replace(/[~!@#$(),.?''""！（），。？“”‘’；：;: +-=\\、·…]/g,'').toLowerCase())){
console.log('屏蔽',target.innerText)
target.innerText = ''
}
}
}
}
const config = {childList: true, subtree: true}
const obser = new MutationObserver(obsFunc)
obser.observe(container,config)
}else{
requestAnimationFrame(addOBS)
}
}
addOBS()
})
// Your code here...
})();