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