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- 'use strict';
- const preserveCamelCase = string => {
- let isLastCharLower = false;
- let isLastCharUpper = false;
- let isLastLastCharUpper = false;
- for (let i = 0; i < string.length; i++) {
- const character = string[i];
- if (isLastCharLower && /[a-zA-Z]/.test(character) && character.toUpperCase() === character) {
- string = string.slice(0, i) + '-' + string.slice(i);
- isLastCharLower = false;
- isLastLastCharUpper = isLastCharUpper;
- isLastCharUpper = true;
- i++;
- } else if (isLastCharUpper && isLastLastCharUpper && /[a-zA-Z]/.test(character) && character.toLowerCase() === character) {
- string = string.slice(0, i - 1) + '-' + string.slice(i - 1);
- isLastLastCharUpper = isLastCharUpper;
- isLastCharUpper = false;
- isLastCharLower = true;
- } else {
- isLastCharLower = character.toLowerCase() === character && character.toUpperCase() !== character;
- isLastLastCharUpper = isLastCharUpper;
- isLastCharUpper = character.toUpperCase() === character && character.toLowerCase() !== character;
- }
- }
- return string;
- };
- const camelCase = (input, options) => {
- if (!(typeof input === 'string' || Array.isArray(input))) {
- throw new TypeError('Expected the input to be `string | string[]`');
- }
- options = Object.assign({
- pascalCase: false
- }, options);
- const postProcess = x => options.pascalCase ? x.charAt(0).toUpperCase() + x.slice(1) : x;
- if (Array.isArray(input)) {
- input = input.map(x => x.trim())
- .filter(x => x.length)
- .join('-');
- } else {
- input = input.trim();
- }
- if (input.length === 0) {
- return '';
- }
- if (input.length === 1) {
- return options.pascalCase ? input.toUpperCase() : input.toLowerCase();
- }
- const hasUpperCase = input !== input.toLowerCase();
- if (hasUpperCase) {
- input = preserveCamelCase(input);
- }
- input = input
- .replace(/^[_.\- ]+/, '')
- .toLowerCase()
- .replace(/[_.\- ]+(\w|$)/g, (_, p1) => p1.toUpperCase())
- .replace(/\d+(\w|$)/g, m => m.toUpperCase());
- return postProcess(input);
- };
- module.exports = camelCase;
- // TODO: Remove this for the next major release
- module.exports.default = camelCase;
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