Replace chosen substrings in outgoing Bilibili live-chat messages before they are sent.
// ==UserScript==
// @name Danmaku replace
// @name:zh-CN 弹幕替换器
// @namespace https://github.com/TZFC/Danmaku-replace
// @version 5.1
// @description Replace chosen substrings in outgoing Bilibili live-chat messages before they are sent.
// @description:zh-CN 在发送前替换哔哩哔哩直播弹幕中的指定字符串。
// @author TZFC
// @match https://live.bilibili.com/*
// @icon https://www.bilibili.com/favicon.ico
// @run-at document-start
// @grant none
// @license GPL-3.0
// ==/UserScript==
(() => {
/* ────────────────────────────── SETTINGS ────────────────────────────── */
const originals = ['包子', '男娘','蓝凉','之交','抖音','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z', '川普', '扣扣','胖次','我的名字','比基尼','丑','喷水','出','扶她','大大','插一下','念经','舔','榜','看我','动态','1','2','3','4','5','6','7','8','9','0','面基','榜一'];
const targets = ['包了', '侽娘','侽娘','Z交' ,'枓音','ａ','ｂ','ｃ','ｄ','ｅ','ｆ','ｇ','ｈ','ｉ','ｊ','ｋ','ｌ','ｍ','ｎ','ｏ','ｐ','ｑ','ｒ','ｓ','ｔ','ｕ','ｖ','ｗ','ｘ','ｙ','ｚ','Ａ','Ｂ','Ｃ','Ｄ','Ｅ','Ｆ','Ｇ','Ｈ','Ｉ','Ｊ','Ｋ','Ｌ','Ｍ','Ｎ','Ｏ','Ｐ','Ｑ','Ｒ','Ｓ','Ｔ','Ｕ','Ｖ','Ｗ','Ｘ','Ｙ','Ｚ', '川晋', '扣.扣','胖㳄','我の名字','此基尼','吜','喷氺','岀','扶他','大太','插1下','念泾','㖭','搒','着我','动.态', '１','２','３','４','５','６','７','８','９','０','面箕','榜𝟷'];
if (originals.length !== targets.length) {
console.error('[Keyword Replacer] Array length mismatch!');
return;
}
/* ───────────────────────── PRECOMPUTE LOOKUPS ───────────────────────── */
const send_path = '/msg/send';
let default_deco_left = localStorage.getItem('deco_left') || '';
let default_deco_right = localStorage.getItem('deco_right') || '';
function escape_regex(s) {
return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}
// Single compiled alternation regex
const replace_regex = new RegExp(`(${originals.map(escape_regex).join('|')})`, 'g');
// O(1) mapping for replacements
const replace_map = new Map();
for (let i = 0; i < originals.length; i++) {
replace_map.set(originals[i], targets[i]);
}
/* ───────────────────────────── TRANSFORM ────────────────────────────── */
function transform_msg(input) {
let content = input;
// fast prefix routing by first two characters
const p0 = input.charCodeAt(0);
const p1 = input.charCodeAt(1);
// "#s "
if (p0 === 0x23 && p1 === 0x73 && input.charCodeAt(2) === 0x20) {
const body = input.slice(3);
// collapse spaces to ♫, then insert ♪ between consecutive non-alnum runs
content = body.replace(/\s+/g, '♫').replace(/([^a-zA-Z0-9])(?=[^a-zA-Z0-9])/g, '$1♪');
}
// "#c "
else if (p0 === 0x23 && p1 === 0x63 && input.charCodeAt(2) === 0x20) {
content = '⚞' + input.slice(3) + '⚟';
}
// "#f "
else if (p0 === 0x23 && p1 === 0x66 && input.charCodeAt(2) === 0x20) {
content = '꧁' + input.slice(3) + '꧂';
}
// "!d " commands
else if (p0 === 0x21 && p1 === 0x64 && input.charCodeAt(2) === 0x20) {
const cmd = input.slice(3).trim();
if (cmd === 'c') {
default_deco_left = '⚞'; default_deco_right = '⚟';
} else if (cmd === 'f') {
default_deco_left = '꧁'; default_deco_right = '꧂';
} else if (cmd === 'x') {
default_deco_left = ''; default_deco_right = '';
}
localStorage.setItem('deco_left', default_deco_left);
localStorage.setItem('deco_right', default_deco_right);
return ''; // command messages are not sent
}
// quick rejection: if no possible match substring exists, skip replace call
if (replace_regex.test(content)) {
// reset lastIndex because .test with /g/ advances it
replace_regex.lastIndex = 0;
content = content.replace(replace_regex, (m) => replace_map.get(m));
}
return default_deco_left + content + default_deco_right;
}
/* ──────────────────────────── HELPERS ──────────────────────────── */
function same_endpoint(url_like) {
const url = typeof url_like === 'string' ? url_like : '';
try {
return new URL(url, location.origin).pathname.endsWith(send_path);
} catch {
return false;
}
}
function patched_body(body) {
// only handle FormData; do not attempt to support other types
// this follows "do not handle malformed nor null input"
if (!(body instanceof FormData)) return body;
if (typeof body.has === 'function' && body.has('emoticonOptions')) return body;
const msg = body.get('msg');
if (msg) body.set('msg', transform_msg(msg));
return body;
}
/* ───────────────────────────── fetch HOOK ───────────────────────────── */
const native_fetch = window.fetch;
window.fetch = function patched_fetch(input, init) {
// Normalize to url string
const url = typeof input === 'string' ? input : (input && input.url) || '';
if (!same_endpoint(url)) {
return native_fetch.call(this, input, init);
}
// If init with FormData body
if (init && init.body) {
const new_body = patched_body(init.body);
if (new_body !== init.body) {
init = { ...init, body: new_body };
}
return native_fetch.call(this, input, init);
}
// If Request instance with body
if (input instanceof Request) {
const req = input;
// Create a derived Request with patched body (POST chat send path)
const derived = new Request(req, { body: patched_body(req.body) });
return native_fetch.call(this, derived);
}
return native_fetch.call(this, input, init);
};
/* ─────────────────────── XMLHttpRequest HOOK ─────────────────────── */
const XHR_OPEN = XMLHttpRequest.prototype.open;
const XHR_SEND = XMLHttpRequest.prototype.send;
const FLAG_PATCH = Symbol('patch_me');
XMLHttpRequest.prototype.open = function open(method, url, ...rest) {
this[FLAG_PATCH] = same_endpoint(url);
return XHR_OPEN.call(this, method, url, ...rest);
};
XMLHttpRequest.prototype.send = function send(body) {
if (this[FLAG_PATCH]) {
body = patched_body(body);
}
return XHR_SEND.call(this, body);
};
})();