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Viewing file:     index.js (3.2 KB)      -rwxrwxrwx

'use strict';

const UPPERCASE = /[\p{Lu}]/u;
const LOWERCASE = /[\p{Ll}]/u;
const LEADING_CAPITAL = /^[\p{Lu}](?![\p{Lu}])/gu;
const IDENTIFIER = /([\p{Alpha}\p{N}_]|$)/u;
const SEPARATORS = /[_.\- ]+/;

const LEADING_SEPARATORS = new RegExp('^' + SEPARATORS.source);
const SEPARATORS_AND_IDENTIFIER = new RegExp(SEPARATORS.source + IDENTIFIER.source, 'gu');
const NUMBERS_AND_IDENTIFIER = new RegExp('\\d+' + IDENTIFIER.source, 'gu');

const preserveCamelCase = (string, toLowerCase, toUpperCase) => {
	let isLastCharLower = false;
	let isLastCharUpper = false;
	let isLastLastCharUpper = false;

	for (let i = 0; i < string.length; i++) {
		const character = string[i];

		if (isLastCharLower && UPPERCASE.test(character)) {
			string = string.slice(0, i) + '-' + string.slice(i);
			isLastCharLower = false;
			isLastLastCharUpper = isLastCharUpper;
			isLastCharUpper = true;
			i++;
		} else if (isLastCharUpper && isLastLastCharUpper && LOWERCASE.test(character)) {
			string = string.slice(0, i - 1) + '-' + string.slice(i - 1);
			isLastLastCharUpper = isLastCharUpper;
			isLastCharUpper = false;
			isLastCharLower = true;
		} else {
			isLastCharLower = toLowerCase(character) === character && toUpperCase(character) !== character;
			isLastLastCharUpper = isLastCharUpper;
			isLastCharUpper = toUpperCase(character) === character && toLowerCase(character) !== character;
		}
	}

	return string;
};

const preserveConsecutiveUppercase = (input, toLowerCase) => {
	LEADING_CAPITAL.lastIndex = 0;

	return input.replace(LEADING_CAPITAL, m1 => toLowerCase(m1));
};

const postProcess = (input, toUpperCase) => {
	SEPARATORS_AND_IDENTIFIER.lastIndex = 0;
	NUMBERS_AND_IDENTIFIER.lastIndex = 0;

	return input.replace(SEPARATORS_AND_IDENTIFIER, (_, identifier) => toUpperCase(identifier))
		.replace(NUMBERS_AND_IDENTIFIER, m => toUpperCase(m));
};

const camelCase = (input, options) => {
	if (!(typeof input === 'string' || Array.isArray(input))) {
		throw new TypeError('Expected the input to be `string | string[]`');
	}

	options = {
		pascalCase: false,
		preserveConsecutiveUppercase: false,
		...options
	};

	if (Array.isArray(input)) {
		input = input.map(x => x.trim())
			.filter(x => x.length)
			.join('-');
	} else {
		input = input.trim();
	}

	if (input.length === 0) {
		return '';
	}

	const toLowerCase = options.locale === false ?
		string => string.toLowerCase() :
		string => string.toLocaleLowerCase(options.locale);
	const toUpperCase = options.locale === false ?
		string => string.toUpperCase() :
		string => string.toLocaleUpperCase(options.locale);

	if (input.length === 1) {
		return options.pascalCase ? toUpperCase(input) : toLowerCase(input);
	}

	const hasUpperCase = input !== toLowerCase(input);

	if (hasUpperCase) {
		input = preserveCamelCase(input, toLowerCase, toUpperCase);
	}

	input = input.replace(LEADING_SEPARATORS, '');

	if (options.preserveConsecutiveUppercase) {
		input = preserveConsecutiveUppercase(input, toLowerCase);
	} else {
		input = toLowerCase(input);
	}

	if (options.pascalCase) {
		input = toUpperCase(input.charAt(0)) + input.slice(1);
	}

	return postProcess(input, toUpperCase);
};

module.exports = camelCase;
// TODO: Remove this for the next major release
module.exports.default = camelCase;