3 function preserveCamelCase(str) {
4 let isLastCharLower = false;
5 let isLastCharUpper = false;
6 let isLastLastCharUpper = false;
8 for (let i = 0; i < str.length; i++) {
11 if (isLastCharLower && /[a-zA-Z]/.test(c) && c.toUpperCase() === c) {
12 str = str.substr(0, i) + '-' + str.substr(i);
13 isLastCharLower = false;
14 isLastLastCharUpper = isLastCharUpper;
15 isLastCharUpper = true;
17 } else if (isLastCharUpper && isLastLastCharUpper && /[a-zA-Z]/.test(c) && c.toLowerCase() === c) {
18 str = str.substr(0, i - 1) + '-' + str.substr(i - 1);
19 isLastLastCharUpper = isLastCharUpper;
20 isLastCharUpper = false;
21 isLastCharLower = true;
23 isLastCharLower = c.toLowerCase() === c;
24 isLastLastCharUpper = isLastCharUpper;
25 isLastCharUpper = c.toUpperCase() === c;
32 module.exports = function (str) {
33 if (arguments.length > 1) {
34 str = Array.from(arguments)
36 .filter(x => x.length)
42 if (str.length === 0) {
46 if (str.length === 1) {
47 return str.toLowerCase();
50 if (/^[a-z0-9]+$/.test(str)) {
54 const hasUpperCase = str !== str.toLowerCase();
57 str = preserveCamelCase(str);
61 .replace(/^[_.\- ]+/, '')
63 .replace(/[_.\- ]+(\w|$)/g, (m, p1) => p1.toUpperCase());