time-to-botec/squiggle/node_modules/@stdlib/process/umask/lib/main.js

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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 proc = require( 'process' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isObject = require( '@stdlib/assert/is-plain-object' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var toSymbolic = require( './to_symbolic.js' );
var fromSymbolic = require( './from_symbolic.js' );
// MAIN //
/**
* Get/set the process mask.
*
* ## Notes
*
* - If provided a mask, the function sets the current mask and returns the previous process mask. Otherwise, the function returns the current process mask.
*
*
* @param {(NonNegativeInteger|string)} [mask] - mask
* @param {Object} [options] - options
* @param {boolean} [options.symbolic] - boolean indicating whether to return a mask using symbolic notation
* @throws {TypeError} must provide either a string, nonnegative integer, or an options object
* @throws {TypeError} must provide valid options
* @throws {Error} must provide a parseable expression mask
* @returns {(NonNegativeInteger|string)} process mask
*
* @example
* var mask = umask();
* // returns <number>
*/
function umask() {
var options;
var nargs;
var mask;
var opts;
var arg;
nargs = arguments.length;
if ( nargs === 0 ) {
return proc.umask();
}
opts = {};
arg = arguments[ 0 ];
if ( nargs === 1 ) {
if ( isString( arg ) ) {
mask = fromSymbolic( proc.umask(), arg );
if ( mask instanceof Error ) {
throw mask;
}
return proc.umask( mask );
}
if ( isNonNegativeInteger( arg ) ) {
// Easy case where we use the built-in function to set the mask and return its return value:
return proc.umask( arg );
}
if ( isObject( arg ) ) {
if ( hasOwnProp( arg, 'symbolic' ) ) {
opts.symbolic = arg.symbolic;
if ( !isBoolean( opts.symbolic ) ) {
throw new TypeError( 'invalid option. `symbolic` option must be a boolean. Option: `' + opts.symbolic + '`.' );
}
}
mask = proc.umask();
if ( opts.symbolic ) {
mask = toSymbolic( mask );
}
return mask;
}
throw new TypeError( 'invalid argument. Must provide either a string, nonnegative integer, or an options object. Value: `' + arg + '`.' );
}
options = arguments[ 1 ];
if ( !isObject( options ) ) {
throw new TypeError( 'invalid argument. Options argument must be an object. Value: `' + options + '`.' );
}
if ( hasOwnProp( options, 'symbolic' ) ) {
opts.symbolic = options.symbolic;
if ( !isBoolean( opts.symbolic ) ) {
throw new TypeError( 'invalid option. `symbolic` option must be a boolean. Option: `' + opts.symbolic + '`.' );
}
}
if ( isString( arg ) ) {
mask = fromSymbolic( proc.umask(), arg );
if ( mask instanceof Error ) {
throw mask;
}
} else if ( isNonNegativeInteger( arg ) ) {
mask = arg;
} else {
throw new TypeError( 'invalid argument. First argument must be either a string or nonnegative integer. Value: `' + arg + '`.' );
}
// Set the mask:
mask = proc.umask( mask );
// Determine how to format the output value:
if ( opts.symbolic ) {
mask = toSymbolic( mask );
}
return mask;
}
// EXPORTS //
module.exports = umask;