// ==UserScript==
// @name          Text Highlighter - Dynamic
// @namespace     erosman
// @author        erosman and Jefferson "jscher2000" Scher
// @version       1.7mo
// @description   Highlights User-defined Text
// @include       https://greasyfork.org/*
// @grant         GM_registerMenuCommand
// @grant         GM_setValue
// @grant         GM_getValue
// ==/UserScript==
/* --------- Note ---------
This script highlights User-defined case-insensitive Text on a page.
TO INCLUDE SITES (only Greasy Fork is initially included):
Go to Add-ons - User Scripts ('Ctrl+ Shift + a' on Firefox)
Click on the Script's Option
Under User Settings Tab, Add Included/Excluded Pages that you want the script to run on
Click OK
Setting Keywords & Highlight Style:
Click on drop-down triangle next to the GreaseMonkey Icon
User Scripts Commands...
Set Keywords
Input keywords separated by comma
Example: word 1,word 2,word 3
Set Highlight Style
Input the Highlight Style (use proper CSS)
Example: color: #f00; font-weight: bold; background-color: #ffe4b5;
Note: If you find that another script #####es with this script, set Text Highlighter to Execute first.
Go to Add-ons - User Scripts ('Ctrl+ Shift + a' on Firefox)
Right Click on the Script
On the context menu click: Execute first
On Add-ons - User Scripts, you can also Click on the Execution Order (top Right) and
change the execution order so that Text Highlighter runs before those scripts that #####es with it.
--------- History ---------
1.7mo Added MutationObserver (Jefferson "jscher2000" Scher)
1.7 Changed script from matching whole words to do partial word match
similar to browser's FIND + escaped RegEx Quantifiers in keywords
1.6 Code Improvement, using test()
1.5 Code Improvement
1.4 Code Improvement + Added support for non-English Words
1.3 Code Improvement, 10x speed increase
1.2 Added User Script Commands, script can now be auto-updated without losing User Data
1.1 Total Code rewrite, Xpath pattern
1.0 Initial release
*/
(function() { // anonymous function wrapper, used for error checking & limiting scope
'use strict';
if (window.self !== window.top) { return; } // end execution if in a frame
// setting User Preferences
function setUserPref(varName, defaultVal, menuText, promtText, sep){
GM_registerMenuCommand(menuText, function() {
var val = prompt(promtText, GM_getValue(varName, defaultVal));
if (val === null)  { return; }  // end execution if clicked CANCEL
// prepare string of variables separated by the separator
if (sep && val){
var pat1 = new RegExp('\\s*' + sep + '+\\s*', 'g'); // trim space/s around separator & trim repeated separator
var pat2 = new RegExp('(?:^' + sep + '+|' + sep + '+$)', 'g'); // trim starting & trailing separator
val = val.replace(pat1, sep).replace(pat2, '');
}
val = val.replace(/\s{2,}/g, ' ').trim();    // remove multiple spaces and trim
GM_setValue(varName, val);
// Apply changes (immediately if there are no existing highlights, or upon reload to clear the old ones)
if(!document.body.querySelector(".THmo")) THmo_doHighlight(document.body);
else location.reload();
});
}
// prepare UserPrefs
setUserPref(
'keywords',
'word 1,word 2,word 3',
'Set Keywords',
'Set keywords separated by comma\t\t\t\t\t\t\t\r\n\r\nExample:\r\nword 1,word 2,word 3',
','
);
setUserPref(
'highlightStyle',
'color: #f00; background-color: #ffebcd;',
'Set Highlight Style',
'Set the Highlight Style (use proper CSS)\r\n\r\nExample:\r\ncolor: #f00; font-weight: bold; background-color: #ffe4b5;'
);
// Add MutationObserver to catch content added dynamically
var THmo_MutOb = (window.MutationObserver) ? window.MutationObserver : window.WebKitMutationObserver;
if (THmo_MutOb){
var THmo_chgMon = new THmo_MutOb(function(mutationSet){
mutationSet.forEach(function(mutation){
for (var i=0; i<mutation.addedNodes.length; i++){
if (mutation.addedNodes[i].nodeType == 1){
THmo_doHighlight(mutation.addedNodes[i]);
}
}
});
});
// attach chgMon to document.body
var opts = {childList: true, subtree: true};
THmo_chgMon.observe(document.body, opts);
}
// Main workhorse routine
function THmo_doHighlight(el){
var keywords = GM_getValue('keywords');
if(!keywords)  { return; }  // end execution if not found
var highlightStyle = GM_getValue('highlightStyle');
if (!highlightStyle) highlightStyle = "color:#00f; font-weight:bold; background-color: #0f0;"
var rQuantifiers = /[-\/\\^$*+?.()|[\]{}]/g;
keywords = keywords.replace(rQuantifiers, '\\$&').split(',').join('|');
var pat = new RegExp('(' + keywords + ')', 'gi');
var span = document.createElement('span');
// getting all text nodes with a few exceptions
var snapElements = document.evaluate(
'.//text()[normalize-space() != "" ' +
'and not(ancestor::style) ' +
'and not(ancestor::script) ' +
'and not(ancestor::textarea) ' +
'and not(ancestor::code) ' +
'and not(ancestor::pre)]',
el, null, XPathR###lt.UNORDERED_NODE_SNAPSHOT_TYPE, null);
if (!snapElements.snapshotItem(0)) { return; }  // end execution if not found
for (var i = 0, len = snapElements.snapshotLength; i < len; i++) {
var node = snapElements.snapshotItem(i);
// check if it contains the keywords
if (pat.test(node.nodeValue)) {
// check that it isn't already highlighted
if (node.className != "THmo" && node.parentNode.className != "THmo"){
// create an element, replace the text node with an element
var sp = span.cloneNode(true);
sp.innerHTML = node.nodeValue.replace(pat, '<span style="' + highlightStyle + '" class="THmo">$1</span>');
node.parentNode.replaceChild(sp, node);
}
}
}
}
// first run
THmo_doHighlight(document.body);
})(); // end of anonymous function