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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
// MAIN //
/**
* Tests if a value is a Windows absolute path.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating if a value is a Windows absolute path
*
* @example
* var bool = isAbsolutePath( 'C:\\foo\\bar\\baz' );
* // returns true
*
* @example
* var bool = isAbsolutePath( 'foo\\bar\\baz' );
* // returns false
*/
function isAbsolutePath( value ) {
var code;
var len;
if ( !isString( value ) ) {
return false;
}
len = value.length;
if ( len === 0 ) {
return false;
}
code = value.charCodeAt( 0 );
// Check if the string begins with either a forward '/' or backward slash '\\':
if ( code === 47 || code === 92 ) {
return true;
}
// Check for a device root (e.g., C:\\)...
if (
(code >= 65 && code <= 90) || // A-Z
(code >= 97 && code <= 122) // a-z
) {
// Check if the string has a colon ':' character:
if ( len > 2 && value.charCodeAt( 1 ) === 58 ) {
code = value.charCodeAt( 2 );
// Check for either a forward or backward slash:
if ( code === 47 || code === 92 ) {
return true;
}
}
}
return false;
}
// EXPORTS //
module.exports = isAbsolutePath;
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