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ElementGetter

async requre element

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/448197/1126009/ElementGetter.js 

// ==UserScript==
// @name         ElementGetter
// @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;
}();