Tc
Toggle the casing between upper, lower, and title case on selected text

Script key: Toggle the casing between upper, lower, and title case on selected text

Posted by @jbielich

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Label Tc
Voice Over Toggle the casing between upper, lower, and title case on selected text
Script
/* 
  * To Title Case 2.1 – http://individed.com/code/to-title-case/
  * Copyright © 2008–2013 David Gouch. Licensed under the MIT License.
 */
 
String.prototype.toTitleCase = function(){
  var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;
 
  return this.replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, function(match, index, title){
    if (index > 0 && index + match.length !== title.length &&
      match.search(smallWords) > -1 && title.charAt(index - 2) !== ":" &&
      (title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
      title.charAt(index - 1).search(/[^\s-]/) < 0) {
      return match.toLowerCase();
    }
 
    if (match.substr(1).search(/[A-Z]|\../) > -1) {
      return match;
    }
 
    return match.charAt(0).toUpperCase() + match.substr(1);
  });
};
 
// Addition by Dr. Drang to work as a Drafts keyboard extension.
// Convert selected text to title case.
 
// 2015-06-29 Addition by John Bielich to toggle casing with one button
 
var s = getSelectedText();
 
if (s == s.toUpperCase()) {
	setSelectedText(s.toLowerCase());
} else if (s == s.toLowerCase()) {
	setSelectedText(s.toTitleCase());
} else {
	setSelectedText(s.toUpperCase());
}

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