80 lines
1.8 KiB
JavaScript
80 lines
1.8 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 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( './../../is-string' ).isPrimitive;
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// MAIN //
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/**
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* Tests if a value is a Windows absolute path.
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*
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* @param {*} value - value to test
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* @returns {boolean} boolean indicating if a value is a Windows absolute path
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*
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* @example
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* var bool = isAbsolutePath( 'C:\\foo\\bar\\baz' );
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* // returns true
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*
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* @example
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* var bool = isAbsolutePath( 'foo\\bar\\baz' );
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* // returns false
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*/
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function isAbsolutePath( value ) {
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var code;
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var len;
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if ( !isString( value ) ) {
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return false;
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}
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len = value.length;
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if ( len === 0 ) {
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return false;
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}
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code = value.charCodeAt( 0 );
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// Check if the string begins with either a forward '/' or backward slash '\\':
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if ( code === 47 || code === 92 ) {
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return true;
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}
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// Check for a device root (e.g., C:\\)...
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if (
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(code >= 65 && code <= 90) || // A-Z
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(code >= 97 && code <= 122) // a-z
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) {
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// Check if the string has a colon ':' character:
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if ( len > 2 && value.charCodeAt( 1 ) === 58 ) {
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code = value.charCodeAt( 2 );
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// Check for either a forward or backward slash:
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if ( code === 47 || code === 92 ) {
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return true;
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}
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}
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}
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return false;
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}
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// EXPORTS //
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module.exports = isAbsolutePath;
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