Common patterns for working with the WEB API.
当前为
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/478440/1271424/NH_web.js
// ==UserScript==
// ==UserLibrary==
// @name NH_web
// @description Common patterns for working with the WEB API.
// @version 0
// @license GPL-3.0-or-later; https://www.gnu.org/licenses/gpl-3.0-standalone.html
// @homepageURL https://github.com/nexushoratio/userscripts
// @supportURL https://github.com/nexushoratio/userscripts/issues
// @match https://www.example.com/*
// ==/UserLibrary==
// ==/UserScript==
window.NexusHoratio ??= {};
window.NexusHoratio.web = (function web() {
'use strict';
/** @type {number} - Bumped per release. */
const version = 0;
const NH = window.NexusHoratio.base.ensure([{name: 'base'}]);
/**
* @typedef {object} Continuation
* @property {boolean} done - Indicate whether the monitor is done
* processing.
* @property {object} [results] - Optional results object.
*/
/**
* @callback Monitor
* @param {MutationRecord[]} records - Standard mutation records.
* @returns {Continuation} - Indicate whether done monitoring.
*/
/**
* Simple function that takes no parameters and returns nothing.
* @callback SimpleFunction
*/
/**
* @typedef {object} OtmotWhat
* @property {string} name - The name for this observer.
* @property {Element} base - Element to observe.
*/
/**
* @typedef {object} OtmotHow
* @property {object} observeOptions - MutationObserver().observe() options.
* @property {SimpleFunction} [trigger] - Function to call that triggers
* observable results.
* @property {Monitor} monitor - Callback used to process MutationObserver
* records.
* @property {number} [timeout] - Time to wait for completion in
* milliseconds, default of 0 disables.
*/
/**
* One time mutation observer with timeout.
* @param {OtmotWhat} what - What to observe.
* @param {OtmotHow} how - How to observe.
* @returns {Promise<Continuation.results>} - Will resolve with the results
* from monitor when done is true.
*/
function otmot(what, how) {
const prom = new Promise((resolve, reject) => {
const {
name,
base,
} = what;
const {
observeOptions,
trigger = () => {}, // eslint-disable-line no-empty-function
monitor,
timeout = 0,
} = how;
const logger = new NH.base.Logger(`otmot ${name}`);
let timeoutID = null;
let observer = null;
/** @param {MutationRecord[]} records - Standard mutation records. */
const moCallback = (records) => {
const {done, results} = monitor(records);
logger.log('monitor:', done, results);
if (done) {
observer.disconnect();
clearTimeout(timeoutID);
logger.log('resolving');
resolve(results);
}
};
/** Standard setTimeout callback. */
const toCallback = () => {
observer.disconnect();
logger.log('rejecting after timeout');
reject(new Error(`otmot ${name} timed out`));
};
observer = new MutationObserver(moCallback);
if (timeout) {
timeoutID = setTimeout(toCallback, timeout);
}
observer.observe(base, observeOptions);
trigger();
logger.log('running');
});
return prom;
}
/**
* @typedef {object} OtrotWhat
* @property {string} name - The name for this observer.
* @property {Element} base - Element to observe.
*/
/**
* @typedef {object} OtrotHow
* @property {SimpleFunction} [trigger] - Function to call that triggers
* observable events.
* @property {number} timeout - Time to wait for completion in milliseconds.
*/
/**
* One time resize observer with timeout.
*
* Will resolve automatically upon first resize change.
* @param {OtrotWhat} what - What to observe.
* @param {OtrotHow} how - How to observe.
* @returns {Promise<OtrotWhat>} - Will resolve with the what parameter.
*/
function otrot(what, how) {
const prom = new Promise((resolve, reject) => {
const {
name,
base,
} = what;
const {
trigger = () => {}, // eslint-disable-line no-empty-function
timeout,
} = how;
const {
clientHeight: initialHeight,
clientWidth: initialWidth,
} = base;
const logger = new NH.base.Logger(`otrot ${name}`);
let timeoutID = null;
let observer = null;
logger.log('initial dimensions:', initialWidth, initialHeight);
/** Standard ResizeObserver callback. */
const roCallback = () => {
const {clientHeight, clientWidth} = base;
logger.log('observed dimensions:', clientWidth, clientHeight);
if (clientHeight !== initialHeight || clientWidth !== initialWidth) {
observer.disconnect();
clearTimeout(timeoutID);
logger.log('resolving');
resolve(what);
}
};
/** Standard setTimeout callback. */
const toCallback = () => {
observer.disconnect();
logger.log('rejecting after timeout');
reject(new Error(`otrot ${name} timed out`));
};
observer = new ResizeObserver(roCallback);
timeoutID = setTimeout(toCallback, timeout);
observer.observe(base);
trigger();
logger.log('running');
});
return prom;
}
/**
* @callback ResizeAction
* @param {ResizeObserverEntry[]} entries - Standard resize entries.
*/
/**
* @typedef {object} Otrot2How
* @property {SimpleFunction} [trigger] - Function to call that triggers
* observable events.
* @property {ResizeAction} action - Function to call upon each event
* observed and also at the end of duration.
* @property {number} duration - Time to run in milliseconds.
*/
/**
* One time resize observer with action callback and duration.
*
* Will resolve upon duration expiration. Uses the same what parameter as
* {@link otrot}.
* @param {OtrotWhat} what - What to observe.
* @param {Otrow2How} how - How to observe.
* @returns {Promise<string>} - Will resolve after duration expires.
*/
function otrot2(what, how) {
const prom = new Promise((resolve) => {
const {
name,
base,
} = what;
const {
trigger = () => {}, // eslint-disable-line no-empty-function
action,
duration,
} = how;
const logger = new NH.base.Logger(`otrot2 ${name}`);
let observer = null;
/** @param {ResizeObserverEntry[]} entries - Standard entries. */
const roCallback = (entries) => {
logger.log('calling action');
action(entries);
};
/** Standard setTimeout callback. */
const toCallback = () => {
observer.disconnect();
action([]);
logger.log('resolving');
resolve(`otrot2 ${name} finished`);
};
observer = new ResizeObserver(roCallback);
setTimeout(toCallback, duration);
observer.observe(base);
trigger();
logger.log('running');
});
return prom;
}
/**
* Wait for selector to match using querySelector.
* @param {string} selector - CSS selector.
* @param {number} timeout - Time to wait in milliseconds, 0 disables.
* @returns {Promise<Element>} - Matched element.
*/
function waitForSelector(selector, timeout) {
const me = 'waitForSelector';
const logger = new NH.base.Logger(me);
logger.entered(me, selector, timeout);
/**
* @implements {Monitor}
* @returns {Continuation} - Indicate whether done monitoring.
*/
const monitor = () => {
const element = document.querySelector(selector);
if (element) {
logger.log(`match for ${selector}`, element);
return {done: true, results: element};
}
logger.log('Still waiting for', selector);
return {done: false};
};
const what = {
name: me,
base: document,
};
const how = {
observeOptions: {childList: true, subtree: true},
monitor: monitor,
timeout: timeout,
};
logger.leaving(me);
return otmot(what, how);
}
return {
version: version,
otmot: otmot,
otrot: otrot,
otrot2: otrot2,
waitForSelector: waitForSelector,
};
}());