swap the case of the selected text
// ==UserScript==
// @name Case converter
// @version 0.2
// @author Noneangel
// @description swap the case of the selected text
// @include http://*
// @include https://*
// @namespace https://gist.github.com/Noneangel/a865645a27e04fbff2843df560ca1dbb
// ==/UserScript==
/* do modify */
// test if one of the key code is pressed
var keyCodes = [114]; //F3
// with the following modifier key pressed
//(note : set to false if modifier should not be pressed)
var modifierKey = {
shiftKey: true
}; // {altKey: false, shiftKey: true, ctrlKey = false}
//which transformation to apply to the text
var transform = invertCase; // invertCase, upperCase, lowerCase
/* modify at your own risk */
/* case transformation */
function invertCase(text) {
return text.split('').map(function(c) {
return c === c.toUpperCase() ? c.toLowerCase() : c.toUpperCase()
}).join('');
}
function upperCase(text) {
return text.toUpperCase();
}
function lowerCase(text) {
return text.toLowerCase();
}
/* get active selection */
//source https://stackoverflow.com/questions/5379120/get-the-highlighted-selected-text
function getSelectionText(activeEl) {
var text = "";
var activeElTagName = activeEl ? activeEl.tagName.toLowerCase() : null;
if (
(activeElTagName == "textarea") || (activeElTagName == "input" &&
/^(?:text|search|password|tel|url)$/i.test(activeEl.type)) &&
(typeof activeEl.selectionStart == "number")
) {
text = activeEl.value.slice(activeEl.selectionStart, activeEl.selectionEnd);
} else if (window.getSelection) {
text = window.getSelection().toString();
}
return text;
}
/* repalce selected text with a replacementText */
//source https://stackoverflow.com/questions/3997659/replace-selected-text-in-contenteditable-div
function replaceSelectedText(replacementText) {
var sel, range;
if (window.getSelection) {
sel = window.getSelection();
if (sel.rangeCount) {
range = sel.getRangeAt(0);
range.deleteContents();
range.insertNode(document.createTextNode(replacementText));
}
} else if (document.selection && document.selection.createRange) {
range = document.selection.createRange();
range.text = replacementText;
}
}
// same but for textarea only
function setInputSelection(elem, text) {
var activeElTagName = elem ? elem.tagName.toLowerCase() : null;
if (
(activeElTagName == "textarea") || (activeElTagName == "input" &&
/^(?:text|search|password|tel|url)$/i.test(elem.type)) &&
(typeof elem.selectionStart == "number")
) {
var indiceStart = elem.selectionStart;
var indiceEnd = elem.selectionEnd;
var s = elem.selectionStart;
var e = elem.selectionEnd;
elem.value = elem.value.substring(0, s) + text + elem.value.substring(e);
elem.setSelectionRange(indiceStart, indiceEnd);
}
}
/* test if obj has the every member of option with the same value */
function validate(option, obj) {
for (var member in option) {
if (option[member] !== obj[member]) {
return false;
}
}
return true;
}
function into(e, array) {
return array.reduce(function(acc, val) {
return acc || (e == val)
}, false);
}
function shortcut(e) {
if (validate(modifierKey, e) && into(e.keyCode, keyCodes)) {
var id = document.activeElement;
var selection = getSelectionText(id);
var transformed = transform(selection);
replaceSelectedText(transformed);
setInputSelection(id, transformed);
e.stopPropagation();
e.preventDefault();
}
}
document.addEventListener('keydown', shortcut, true);