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index.js 1.0KB

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  1. 'use strict';
  2. function preserveCamelCase(str) {
  3. var isLastCharLower = false;
  4. for (var i = 0; i < str.length; i++) {
  5. var c = str.charAt(i);
  6. if (isLastCharLower && (/[a-zA-Z]/).test(c) && c.toUpperCase() === c) {
  7. str = str.substr(0, i) + '-' + str.substr(i);
  8. isLastCharLower = false;
  9. i++;
  10. } else {
  11. isLastCharLower = (c.toLowerCase() === c);
  12. }
  13. }
  14. return str;
  15. }
  16. module.exports = function () {
  17. var str = [].map.call(arguments, function (str) {
  18. return str.trim();
  19. }).filter(function (str) {
  20. return str.length;
  21. }).join('-');
  22. if (!str.length) {
  23. return '';
  24. }
  25. if (str.length === 1) {
  26. return str.toLowerCase();
  27. }
  28. if (!(/[_.\- ]+/).test(str)) {
  29. if (str === str.toUpperCase()) {
  30. return str.toLowerCase();
  31. }
  32. if (str[0] !== str[0].toLowerCase()) {
  33. return str[0].toLowerCase() + str.slice(1);
  34. }
  35. return str;
  36. }
  37. str = preserveCamelCase(str);
  38. return str
  39. .replace(/^[_.\- ]+/, '')
  40. .toLowerCase()
  41. .replace(/[_.\- ]+(\w|$)/g, function (m, p1) {
  42. return p1.toUpperCase();
  43. });
  44. };