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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 isObject = require( '@stdlib/assert/is-plain-object' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
var isNonNegative = require( '@stdlib/assert/is-nonnegative-number' ).isPrimitive;
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isRegExp = require( '@stdlib/assert/is-regexp' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination object
* @param {Options} options - function options
* @param {(string|RegExp)} [options.sep] - separator used to split streamed data
* @param {boolean} [options.objectMode] - specifies whether stream should operate in object mode
* @param {(string|null)} [options.encoding] - specifies how `Buffer` objects should be decoded to `strings`
* @param {NonNegativeNumber} [options.highWaterMark] - specifies the `Buffer` level for when `write()` starts returning `false`
* @param {boolean} [options.allowHalfOpen] - specifies whether the stream should remain open even if one side ends
* @param {boolean} [options.writableObjectMode] - specifies whether the writable side should be in object mode
* @returns {(Error|null)} null or an error object
*
* @example
* var opts = {};
* var options = {
* 'sep': '\t',
* 'objectMode': true
* };
* var err = validate( opts, options );
* if ( err ) {
* throw err;
* }
*/
function validate( opts, options ) {
if ( !isObject( options ) ) {
return new TypeError( format( 'invalid argument. Options argument must be an object. Value: `%s`.', options ) );
}
if ( hasOwnProp( options, 'sep' ) ) {
opts.sep = options.sep;
if (
!isString( opts.sep ) &&
!isRegExp( opts.sep )
) {
return new TypeError( format( 'invalid option. `%s` option must be either a string or a regular expression. Option: `%s`.', 'sep', opts.sep ) );
}
}
if ( hasOwnProp( options, 'objectMode' ) ) {
opts.objectMode = options.objectMode;
if ( !isBoolean( opts.objectMode ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'objectMode', opts.objectMode ) );
}
}
if ( hasOwnProp( options, 'writableObjectMode' ) ) {
opts.writableObjectMode = options.writableObjectMode;
if ( !isBoolean( opts.writableObjectMode ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'writableObjectMode', opts.writableObjectMode ) );
}
}
if ( hasOwnProp( options, 'encoding' ) ) {
opts.encoding = options.encoding;
if ( !isString( opts.encoding ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a string. Option: `%s`.', 'encoding', opts.encoding ) );
}
}
if ( hasOwnProp( options, 'allowHalfOpen' ) ) {
opts.allowHalfOpen = options.allowHalfOpen;
if ( !isBoolean( opts.allowHalfOpen ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a boolean. Option: `%s`.', 'allowHalfOpen', opts.allowHalfOpen ) );
}
}
if ( hasOwnProp( options, 'highWaterMark' ) ) {
opts.highWaterMark = options.highWaterMark;
if ( !isNonNegative( opts.highWaterMark ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a nonnegative number. Option: `%s`.', 'highWaterMark', opts.highWaterMark ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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