107 lines
3.0 KiB
JavaScript
107 lines
3.0 KiB
JavaScript
'use strict';
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const UPPERCASE = /[\p{Lu}]/u;
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const LOWERCASE = /[\p{Ll}]/u;
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const LEADING_CAPITAL = /^[\p{Lu}](?![\p{Lu}])/gu;
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const IDENTIFIER = /([\p{Alpha}\p{N}_]|$)/u;
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const SEPARATORS = /[_.\- ]+/;
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const LEADING_SEPARATORS = new RegExp('^' + SEPARATORS.source);
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const SEPARATORS_AND_IDENTIFIER = new RegExp(SEPARATORS.source + IDENTIFIER.source, 'gu');
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const NUMBERS_AND_IDENTIFIER = new RegExp('\\d+' + IDENTIFIER.source, 'gu');
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const preserveCamelCase = (string, locale) => {
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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 && UPPERCASE.test(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 && LOWERCASE.test(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.toLocaleLowerCase(locale) === character && character.toLocaleUpperCase(locale) !== character;
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isLastLastCharUpper = isLastCharUpper;
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isLastCharUpper = character.toLocaleUpperCase(locale) === character && character.toLocaleLowerCase(locale) !== character;
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}
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}
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return string;
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};
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const preserveConsecutiveUppercase = input => {
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LEADING_CAPITAL.lastIndex = 0;
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return input.replace(LEADING_CAPITAL, m1 => m1.toLowerCase());
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};
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const postProcess = (input, options) => {
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SEPARATORS_AND_IDENTIFIER.lastIndex = 0;
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NUMBERS_AND_IDENTIFIER.lastIndex = 0;
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return input.replace(SEPARATORS_AND_IDENTIFIER, (_, identifier) => identifier.toLocaleUpperCase(options.locale))
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.replace(NUMBERS_AND_IDENTIFIER, m => m.toLocaleUpperCase(options.locale));
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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 = {
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pascalCase: false,
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preserveConsecutiveUppercase: false,
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...options
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};
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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.toLocaleUpperCase(options.locale) : input.toLocaleLowerCase(options.locale);
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}
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const hasUpperCase = input !== input.toLocaleLowerCase(options.locale);
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if (hasUpperCase) {
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input = preserveCamelCase(input, options.locale);
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}
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input = input.replace(LEADING_SEPARATORS, '');
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if (options.preserveConsecutiveUppercase) {
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input = preserveConsecutiveUppercase(input);
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} else {
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input = input.toLocaleLowerCase();
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}
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if (options.pascalCase) {
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input = input.charAt(0).toLocaleUpperCase(options.locale) + input.slice(1);
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}
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return postProcess(input, options);
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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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