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simple toolkit to help me create userscripts
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.icu/scripts/526417/1604489/USToolkit.js
// ==UserScript==
// @name USToolkit
// @namespace http://greasyfork.icu/pt-BR/users/821661
// @version 0.0.4
// @run-at document-start
// @author hdyzen
// @description simple toolkit to help me create userscripts
// @license MIT
// ==/UserScript==
/**
* Some functions are strongly inspired by:
* github.com/violentmonkey/
* github.com/gorhill/uBlock/
*
*/
(() => {
function observer(func) {
const observer = new MutationObserver(() => {
const disconnect = func();
if (disconnect === true) {
observer.disconnect();
}
});
observer.observe(document, { childList: true, subtree: true });
}
function waitElement(selector, timeoutSeconds = 10) {
return new Promise((resolve, reject) => {
const element = document.querySelector(selector);
if (element) {
resolve(element);
}
const mutationsHandler = () => {
const target = document.querySelector(selector);
if (target) {
observer.disconnect();
resolve(target);
}
};
const observer = new MutationObserver(mutationsHandler);
observer.observe(document.documentElement || document, {
childList: true,
subtree: true,
});
setTimeout(() => {
observer.disconnect();
reject(`Timeout ${timeoutSeconds} seconds!`);
}, timeoutSeconds * 1000);
});
}
const asyncQuerySelector = waitElement;
function matchProp(obj, propChain) {
if (!obj || typeof propChain !== "string") {
return;
}
const props = propChain.split(".");
let current = obj;
for (let i = 0; i < props.length; i++) {
const prop = props[i];
if (current === undefined || current === null) {
return;
}
if (prop === "[]" && Array.isArray(current)) {
i++;
current = handleArray(current, props[i]);
continue;
}
if ((prop === "{}" || prop === "*") && isObject(current)) {
i++;
current = handleObject(current, props[i]);
continue;
}
current = current[prop];
}
return current;
}
function handleArray(arr, nextProp) {
const results = arr.map((item) => getProp(item, nextProp)).filter((val) => val !== undefined);
return results.length === 1 ? results[0] : results;
}
function handleObject(obj, nextProp) {
const keys = Object.keys(obj);
const results = keys.map((key) => getProp(obj[key], nextProp)).filter((val) => val !== undefined);
return results.length === 1 ? results[0] : results;
}
function getProp(obj, prop) {
if (obj && Object.hasOwn(obj, prop)) {
return obj[prop];
}
return;
}
function isObject(val) {
return Object.prototype.toString.call(val) === "[object Object]";
}
function getValType(val) {
return Object.prototype.toString.call(val).slice(8, -1).toLowerCase();
}
function update(func, time = 250) {
const exec = () => {
if (func() === true) {
return;
}
setTimeout(() => {
requestAnimationFrame(exec);
}, time);
};
requestAnimationFrame(exec);
}
function patch(owner, methodName, handler) {
const originalMethod = owner[methodName];
if (typeof originalMethod !== "function") {
throw new Error(`The method “${methodName}” was not found in the object "${owner}".`);
}
const proxy = new Proxy(originalMethod, handler);
owner[methodName] = proxy;
return () => {
owner[methodName] = originalMethod;
};
}
function onUrlChange(callback) {
let previousUrl = location.href;
const observer = new MutationObserver(() => {
if (location.href !== previousUrl) {
previousUrl = location.href;
callback(location.href);
}
});
observer.observe(document.body || document.documentElement || document, { childList: true, subtree: true });
const historyHandler = {
apply(target, thisArg, args) {
const result = Reflect.apply(target, thisArg, args);
setTimeout(() => {
if (location.href !== previousUrl) {
previousUrl = location.href;
callback(location.href);
}
}, 0);
return result;
},
};
patch(history, "pushState", historyHandler);
patch(history, "replaceState", historyHandler);
}
function request(options) {
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({
...options,
onload: resolve,
onerror: reject,
ontimeout: reject,
});
});
}
function extractProps(element, propsArray) {
const data = {};
for (const propDefinition of propsArray) {
const [label, valuePath] = propDefinition.split(":");
if (valuePath) {
data[label] = matchProp(element, valuePath);
} else {
data[label] = matchProp(element, label);
}
}
return data;
}
function handleStringRule(container, rule) {
const element = container.querySelector(rule);
return element ? element.textContent.trim() : null;
}
function handleArrayRule(container, rule) {
const [subSelector, ...propsToGet] = rule;
const element = !subSelector ? container : container.querySelector(subSelector);
return extractProps(element, propsToGet);
}
const ruleHandlers = {
string: handleStringRule,
array: handleArrayRule,
};
function getRuleType(rule) {
if (typeof rule === "string") return "string";
if (Array.isArray(rule)) return "array";
return "unknown";
}
function processObjectSchema(container, schema) {
const item = {};
for (const key in schema) {
const rule = schema[key];
const ruleType = getRuleType(rule);
const handler = ruleHandlers[ruleType];
if (handler) {
item[key] = handler(container, rule);
continue;
}
console.warn(`[USToolkit.scrape] Rule for key “${key}” has an unsupported type.`);
}
return item;
}
function processContainer(container, schema) {
if (Array.isArray(schema)) {
return extractProps(container, schema);
}
if (isObject(schema)) {
return processObjectSchema(container, schema);
}
console.warn("[USToolkit.scrape] Invalid schema format.");
return {};
}
function scrape(containerSelector, schema, scope = document) {
const containers = scope.querySelectorAll(containerSelector);
const results = [];
for (const container of containers) {
const item = processContainer(container, schema);
results.push(item);
}
return results;
}
window.UST = window.UST || {};
Object.assign(window.UST, {
observer,
waitElement,
asyncQuerySelector,
matchProp,
handleArray,
handleObject,
getProp,
isObject,
update,
patch,
onUrlChange,
request,
scrape,
});
})();