97 lines
3.4 KiB
JavaScript
97 lines
3.4 KiB
JavaScript
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/**
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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 isObject = require( '@stdlib/assert/is-plain-object' );
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
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var isNonNegative = require( '@stdlib/assert/is-nonnegative-number' ).isPrimitive;
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var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var isFunction = require( '@stdlib/assert/is-function' );
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// MAIN //
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/**
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* Validates function options.
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*
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* @private
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* @param {Object} opts - destination object
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* @param {Options} options - function options
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* @param {string} [options.sep] - separator used to join streamed data
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* @param {boolean} [options.objectMode] - specifies whether a stream should operate in object mode
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* @param {(string|null)} [options.encoding] - specifies how `Buffer` objects should be decoded to `strings`
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* @param {NonNegativeNumber} [options.highWaterMark] - specifies the maximum number of bytes to store in the internal buffer before pausing streaming
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* @param {Function} [options.serialize] - custom serialization function
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* @returns {(Error|null)} null or an error object
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*
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* @example
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* var opts = {};
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* var options = {
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* 'objectMode': true
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* };
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* var err= validate( opts, options );
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* if ( err ) {
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* throw err;
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* }
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*/
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function validate( opts, options ) {
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if ( !isObject( options ) ) {
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return new TypeError( 'invalid argument. Options must be an object. Value: `' + options + '`.' );
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}
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if ( hasOwnProp( options, 'sep' ) ) {
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opts.sep = options.sep;
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if ( !isString( opts.sep ) ) {
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return new TypeError( 'invalid option. `sep` option must be a primitive string. Option: `' + opts.sep + '`.' );
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}
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}
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if ( hasOwnProp( options, 'objectMode' ) ) {
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opts.objectMode = options.objectMode;
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if ( !isBoolean( opts.objectMode ) ) {
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return new TypeError( 'invalid option. `objectMode` option must be a primitive boolean. Option: `' + opts.objectMode + '`.' );
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}
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}
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if ( hasOwnProp( options, 'encoding' ) ) {
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opts.encoding = options.encoding;
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if ( !isString( opts.encoding ) && opts.encoding !== null ) {
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return new TypeError( 'invalid option. `encoding` option must be a primitive string or null. Option: `' + opts.encoding + '`.' );
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}
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}
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if ( hasOwnProp( options, 'highWaterMark' ) ) {
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opts.highWaterMark = options.highWaterMark;
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if ( !isNonNegative( opts.highWaterMark ) ) {
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return new TypeError( 'invalid option. `highWaterMark` option must be a nonnegative number. Option: `' + opts.highWaterMark + '`.' );
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}
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}
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if ( hasOwnProp( options, 'serialize' ) ) {
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opts.serialize = options.serialize;
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if ( !isFunction( opts.serialize ) ) {
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return new TypeError( 'invalid option. `serialize` option must be a function. Option: `' + opts.serialize + '`.' );
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}
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}
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return null;
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}
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// EXPORTS //
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module.exports = validate;
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