Files F99207540

index.js
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Created: Wed, Jan 22, 09:38

index.js
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	'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;

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