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Non-Printable Character Detection

Replace non-printable characters, e.g., zero-width spaces, with a visible symbol.

当前为 2021-09-16 提交的版本，查看 最新版本。

  1. // ==UserScript==
  2. // @name         Non-Printable Character Detection
  3. // @namespace    https://greasyfork.org/users/193469
  4. // @description  Replace non-printable characters, e.g., zero-width spaces, with a visible symbol.
  5. // @version      1.1
  6. // @author       Rui LIU (@liurui39660)
  7. // @match        *://*/*
  8. // @icon         https://icons.duckduckgo.com/ip2/example.com.ico
  9. // @license      MIT
  10. // @run-at       document-end
  11. // ==/UserScript==
  12.  
  13. (function () {
  14. 	'use strict';
  15.  
  16. 	const regex = /\p{Cf}/gu; // https://stackoverflow.com/a/12054775/8056404
  17. 	const to = '\u2756'; // ❖
  18.  
  19. 	const walker = document.createTreeWalker(document.body, NodeFilter.SHOW_TEXT);
  20. 	const replace = () => {
  21. 		let node;
  22. 		while (node = walker.nextNode()) {
  23. 			node.nodeValue = node.nodeValue.replaceAll(regex, to);
  24. 		}
  25. 	}
  26.  
  27. 	replace();
  28. 	new MutationObserver(mutations => {
  29. 		for (const mutation of mutations) {
  30. 			for (const node of mutation.addedNodes) {
  31. 				walker.currentNode = node;
  32. 				replace();
  33. 			}
  34. 		}
  35. 	}).observe(document.body, {subtree: true, childList: true});
  36. })();