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Linkify

Turn plain-text URLs into hyperlinks

  1. // ==UserScript==
  2.  
  3. // @name		  Linkify
  4. // @version        0.1
  5. // @namespace	  http://youngpup.net/userscripts
  6.  
  7. // @description   Turn plain-text URLs into hyperlinks
  8.  
  9. // @include *
  10.  
  11. // ==/UserScript==
  12.  
  13.  
  14.  
  15. // based on code by Aaron Boodman
  16.  
  17. // and included here with his gracious permission
  18.  
  19.  
  20.  
  21. var urlRegex = /\b(https?:\/\/[^\s+\"\<\>]+)/ig;
  22.  
  23. var snapTextElements = document.evaluate("//text()[not(ancestor::a) " + 
  24.  
  25.                                          "and not(ancestor::script) and not(ancestor::style) and " + 
  26.  
  27.                                          "contains(translate(., 'HTTP', 'http'), 'http')]", 
  28.  
  29.                                          document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
  30.  
  31. for (var i = snapTextElements.snapshotLength - 1; i >= 0; i--) {
  32.  
  33.     var elmText = snapTextElements.snapshotItem(i);
  34.  
  35.     if (urlRegex.test(elmText.nodeValue)) {
  36.  
  37.         var elmSpan = document.createElement("span");
  38.  
  39.         var sURLText = elmText.nodeValue;
  40.  
  41.         elmText.parentNode.replaceChild(elmSpan, elmText);
  42.  
  43.         urlRegex.lastIndex = 0;
  44.  
  45.         for (var match = null, lastLastIndex = 0;
  46.  
  47.              (match = urlRegex.exec(sURLText)); ) { 
  48.  
  49.             elmSpan.appendChild(document.createTextNode(
  50.  
  51.                 sURLText.substring(lastLastIndex, match.index))); 
  52.  
  53.             var elmLink = document.createElement("a"); 
  54.  
  55.             elmLink.setAttribute("href", match[0]); 
  56.  
  57.             elmLink.appendChild(document.createTextNode(match[0])); 
  58.  
  59.             elmSpan.appendChild(elmLink); 
  60.  
  61.             lastLastIndex = urlRegex.lastIndex;
  62.  
  63.         }
  64.  
  65.         elmSpan.appendChild(document.createTextNode(
  66.  
  67.             sURLText.substring(lastLastIndex)));
  68.  
  69.         elmSpan.normalize();
  70.  
  71.     }
  72.  
  73. }