main.js (2364B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2021 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MODULES // 22 23 var isString = require( '@stdlib/assert/is-string' ).isPrimitive; 24 var capitalize = require( './../../capitalize' ); 25 var lowercase = require( './../../lowercase' ); 26 var replace = require( './../../replace' ); 27 var format = require( './../../format' ); 28 var trim = require( './../../trim' ); 29 30 31 // VARIABLES // 32 33 var RE_WHITESPACE = /\s+/g; 34 var RE_SPECIAL = /[-!"'(),–.:;<>?`{}|~\/\\\[\]_#$*&^@%]+/g; // eslint-disable-line no-useless-escape 35 var RE_TO_PASCAL = /(?:\s|^)([^\s]+)(?=\s|$)/g; 36 var RE_CAMEL = /([a-z0-9])([A-Z])/g; 37 38 39 // FUNCTIONS // 40 41 /** 42 * Callback invoked upon a match. 43 * 44 * @private 45 * @param {string} match - entire match 46 * @param {string} p1 - first capture group 47 * @returns {string} capitalized capture group 48 */ 49 function replacer( match, p1 ) { 50 return capitalize( lowercase( p1 ) ); 51 } 52 53 54 // MAIN // 55 56 /** 57 * Converts a string to Pascal case. 58 * 59 * @param {string} str - string to convert 60 * @throws {TypeError} must provide a string primitive 61 * @returns {string} Pascal-cased string 62 * 63 * @example 64 * var out = pascalcase( 'foo bar' ); 65 * // returns 'FooBar' 66 * 67 * @example 68 * var out = pascalcase( 'IS_MOBILE' ); 69 * // returns 'IsMobile' 70 * 71 * @example 72 * var out = pascalcase( 'Hello World!' ); 73 * // returns 'HelloWorld' 74 * 75 * @example 76 * var out = pascalcase( '--foo-bar--' ); 77 * // returns 'FooBar' 78 */ 79 function pascalcase( str ) { 80 if ( !isString( str ) ) { 81 throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) ); 82 } 83 str = replace( str, RE_SPECIAL, ' ' ); 84 str = replace( str, RE_WHITESPACE, ' ' ); 85 str = replace( str, RE_CAMEL, '$1 $2' ); 86 str = trim( str ); 87 str = replace( str, RE_TO_PASCAL, replacer ); 88 return str; 89 } 90 91 92 // EXPORTS // 93 94 module.exports = pascalcase;