win32.js (1842B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 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( './../../is-string' ).isPrimitive; 24 25 26 // MAIN // 27 28 /** 29 * Tests if a value is a Windows absolute path. 30 * 31 * @param {*} value - value to test 32 * @returns {boolean} boolean indicating if a value is a Windows absolute path 33 * 34 * @example 35 * var bool = isAbsolutePath( 'C:\\foo\\bar\\baz' ); 36 * // returns true 37 * 38 * @example 39 * var bool = isAbsolutePath( 'foo\\bar\\baz' ); 40 * // returns false 41 */ 42 function isAbsolutePath( value ) { 43 var code; 44 var len; 45 if ( !isString( value ) ) { 46 return false; 47 } 48 len = value.length; 49 if ( len === 0 ) { 50 return false; 51 } 52 code = value.charCodeAt( 0 ); 53 54 // Check if the string begins with either a forward '/' or backward slash '\\': 55 if ( code === 47 || code === 92 ) { 56 return true; 57 } 58 // Check for a device root (e.g., C:\\)... 59 if ( 60 (code >= 65 && code <= 90) || // A-Z 61 (code >= 97 && code <= 122) // a-z 62 ) { 63 // Check if the string has a colon ':' character: 64 if ( len > 2 && value.charCodeAt( 1 ) === 58 ) { 65 code = value.charCodeAt( 2 ); 66 67 // Check for either a forward or backward slash: 68 if ( code === 47 || code === 92 ) { 69 return true; 70 } 71 } 72 } 73 return false; 74 } 75 76 77 // EXPORTS // 78 79 module.exports = isAbsolutePath;