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cxxjackie的ElementGetter库
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.greasyfork.org/scripts/463455/1172110/NElementGetter.js
// ==UserScript==
// @name NElementGetter
// @author cxxjackie
// @version 1.2.1
// @supportURL https://bbs.tampermonkey.net.cn/thread-2726-1-1.html
// ==/UserScript==
var ElementGetter = function() {
const _jQuery = Symbol('jQuery');
const _window = Symbol('window');
const _matches = Symbol('matches');
const _MutationObs = Symbol('MutationObs');
const _listeners = Symbol('listeners');
const _addObserver = Symbol('addObserver');
const _addFilter = Symbol('addFilter');
const _removeFilter = Symbol('removeFilter');
const _query = Symbol('query');
const _getOne = Symbol('getOne');
const _getList = Symbol('getList');
class ElementGetter {
[_addObserver](target, callback) {
const observer = new this[_MutationObs](mutations => {
for (const mutation of mutations) {
if (mutation.type === 'attributes') {
callback(mutation.target);
if (observer.canceled) return;
}
for (const node of mutation.addedNodes) {
if (node instanceof Element) callback(node);
if (observer.canceled) return;
}
}
});
observer.canceled = false;
observer.observe(target, {childList: true, subtree: true, attributes: true});
return () => {
observer.canceled = true;
observer.disconnect();
};
}
[_addFilter](target, filter) {
let listener = this[_listeners].get(target);
if (!listener) {
listener = {
filters: new Set(),
remove: this[_addObserver](target, el => {
listener.filters.forEach(f => f(el));
})
};
this[_listeners].set(target, listener);
}
listener.filters.add(filter);
}
[_removeFilter](target, filter) {
const listener = this[_listeners].get(target);
if (!listener) return;
listener.filters.delete(filter);
if (!listener.filters.size) {
listener.remove();
this[_listeners].delete(target);
}
}
[_query](all, selector, parent, includeParent) {
const $ = this[_jQuery];
if ($) {
let jNodes = includeParent ? $(parent) : $([]);
jNodes = jNodes.add([...parent.querySelectorAll('*')]).filter(selector);
if (all) {
return $.map(jNodes, el => $(el));
} else {
return jNodes.length ? $(jNodes.get(0)) : null;
}
} else {
const checkParent = includeParent && this[_matches].call(parent, selector);
if (all) {
const result = checkParent ? [parent] : [];
result.push(...parent.querySelectorAll(selector));
return result;
} else {
return checkParent ? parent : parent.querySelector(selector);
}
}
}
[_getOne](selector, parent, timeout) {
return new Promise(resolve => {
const node = this[_query](false, selector, parent, false);
if (node) return resolve(node);
let timer;
const filter = el => {
const node = this[_query](false, selector, el, true);
if (node) {
this[_removeFilter](parent, filter);
timer && clearTimeout(timer);
resolve(node);
}
};
this[_addFilter](parent, filter);
if (timeout > 0) {
timer = setTimeout(() => {
this[_removeFilter](parent, filter);
resolve(null);
}, timeout);
}
});
}
[_getList](selectorList, parent, timeout) {
return Promise.all(selectorList.map(selector => this[_getOne](selector, parent, timeout)));
}
constructor(jQuery) {
this[_jQuery] = jQuery && jQuery.fn && jQuery.fn.jquery ? jQuery : null;
this[_window] = window.unsafeWindow || document.defaultView || window;
const elProto = this[_window].Element.prototype;
this[_matches] = elProto.matches
|| elProto.matchesSelector
|| elProto.mozMatchesSelector
|| elProto.oMatchesSelector
|| elProto.webkitMatchesSelector;
this[_MutationObs] = this[_window].MutationObserver
|| this[_window].WebkitMutationObserver
|| this[_window].MozMutationObserver;
this[_listeners] = new WeakMap();
}
get(selector, ...args) {
const parent = typeof args[0] !== 'number' && args.shift() || this[_window].document;
const timeout = args[0] || 0;
if (Array.isArray(selector)) {
return this[_getList](selector, parent, timeout);
} else {
return this[_getOne](selector, parent, timeout);
}
}
each(selector, ...args) {
const parent = typeof args[0] !== 'function' && args.shift() || this[_window].document;
const callback = args[0];
const refs = new WeakSet();
const nodes = this[_query](true, selector, parent, false);
for (const node of nodes) {
refs.add(this[_jQuery] ? node.get(0) : node);
if (callback(node, false) === false) return;
}
const filter = el => {
const nodes = this[_query](true, selector, el, true);
for (const node of nodes) {
const _el = this[_jQuery] ? node.get(0) : node;
if (!refs.has(_el)) {
refs.add(_el);
if (callback(node, true) === false) {
return this[_removeFilter](parent, filter);
}
}
}
};
this[_addFilter](parent, filter);
}
create(domString, parent) {
const template = this[_window].document.createElement('template');
template.innerHTML = domString;
const node = template.content.firstElementChild || template.content.firstChild;
parent ? parent.appendChild(node) : node.remove();
return node;
}
}
return ElementGetter;
}();