97 lines
2.4 KiB
JavaScript
97 lines
2.4 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2021 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var capitalize = require( './../../capitalize' );
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var lowercase = require( './../../lowercase' );
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var replace = require( './../../replace' );
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var format = require( './../../format' );
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var trim = require( './../../trim' );
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// VARIABLES //
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var RE_WHITESPACE = /\s+/g;
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var RE_SPECIAL = /[-!"'(),–.:;<>?`{}|~\/\\\[\]_#$*&^@%]+/g; // eslint-disable-line no-useless-escape
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var RE_TO_CAMEL = /(?:\s|^)([^\s]+)(?=\s|$)/g;
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var RE_CAMEL = /([a-z0-9])([A-Z])/g;
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// FUNCTIONS //
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/**
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* Converts first capture group to uppercase.
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*
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* @private
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* @param {string} match - entire match
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* @param {string} p1 - first capture group
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* @param {number} offset - offset of the matched substring in entire string
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* @returns {string} uppercased capture group
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*/
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function replacer( match, p1, offset ) {
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p1 = lowercase( p1 );
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return ( offset === 0 ) ? p1 : capitalize( p1 );
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}
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// MAIN //
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/**
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* Converts a string to camel case.
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*
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* @param {string} str - string to convert
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* @throws {TypeError} must provide a string primitive
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* @returns {string} camel-cased string
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*
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* @example
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* var out = camelcase( 'foo bar' );
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* // returns 'fooBar'
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*
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* @example
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* var out = camelcase( 'IS_MOBILE' );
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* // returns 'isMobile'
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*
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* @example
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* var out = camelcase( 'Hello World!' );
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* // returns 'helloWorld'
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*
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* @example
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* var out = camelcase( '--foo-bar--' );
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* // returns 'fooBar'
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*/
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function camelcase( str ) {
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if ( !isString( str ) ) {
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throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
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}
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str = replace( str, RE_SPECIAL, ' ' );
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str = replace( str, RE_WHITESPACE, ' ' );
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str = replace( str, RE_CAMEL, '$1 $2' );
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str = trim( str );
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str = replace( str, RE_TO_CAMEL, replacer );
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return str;
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}
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// EXPORTS //
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module.exports = camelcase;
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