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