Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var isObject = require( '@stdlib/assert/is-plain-object' );
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' );
var isPositiveNumberArray = require( '@stdlib/assert/is-positive-number-array' );
var isFunction = require( '@stdlib/assert/is-function' );
var isError = require( '@stdlib/assert/is-error' );
var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
var format = require( '@stdlib/string/format' );
var isnan = require( '@stdlib/assert/is-nan' );
var getKernel = require( './get_kernel.js' );
// MAIN //
/**
* Validates function options.
*
* @private
* @param {Object} opts - destination object
* @param {Options} options - function options
* @param {number} [options.n] - number of splits in the generated grid
* @param {NumericArray} [options.h] - array of length two indicating the x and y bandwidth values
* @param {number} [options.xMin] - lower limit of x
* @param {number} [options.xMax] - upper limit of x
* @param {number} [options.yMin] - lower limit of y
* @param {number} [options.yMax] - upper limit of y
* @param {(string|Function)} [options.kernel] - a string or function to specifying the used kernel function
* @returns {(Error|null)} null or an error object
*
* @example
* var opts = {};
* var options = {
* 'xMin': 3.14,
* 'kernel': 'gaussian'
* };
* 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, 'h' ) ) {
opts.h = options.h;
if ( !isPositiveNumberArray( opts.h) ) {
return new TypeError( format( 'invalid option. `%s` option must be an array of positive numbers. Option: `%s`.', 'h', opts.h ) );
}
if ( opts.h.length !== 2 ) {
return new TypeError( format( 'invalid option. `%s` option must be an array of length two. Option: `%s`.', 'h', opts.h ) );
}
}
if ( hasOwnProp( options, 'n' ) ) {
opts.n = options.n;
if ( !isPositiveInteger( opts.n ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a positive integer. Option: `%s`.', 'n', opts.n ) );
}
}
if ( hasOwnProp( options, 'xMax' ) ) {
opts.xMax = options.xMax;
if ( !isNumber( opts.xMax ) || isnan( opts.xMax ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a number. Option: `%s`.', 'xMax', opts.xMax ) );
}
}
if ( hasOwnProp( options, 'xMin' ) ) {
opts.xMin = options.xMin;
if ( !isNumber( opts.xMin ) || isnan( opts.xMin ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a number. Option: `%s`.', 'xMin', opts.xMin ) );
}
}
if ( hasOwnProp( options, 'yMax' ) ) {
opts.yMax = options.yMax;
if ( !isNumber( opts.yMax ) || isnan( opts.yMax ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a number. Option: `%s`.', 'yMax', opts.yMax ) );
}
}
if ( hasOwnProp( options, 'yMin' ) ) {
opts.yMin = options.yMin;
if ( !isNumber( opts.yMin ) || isnan( opts.yMin ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a number. Option: `%s`.', 'yMin', opts.yMin ) );
}
}
if ( hasOwnProp( options, 'kernel' ) ) {
opts.kernel = options.kernel;
if ( isString( opts.kernel ) ) {
opts.kernel = getKernel( opts.kernel );
if ( isError( opts.kernel ) ) {
return opts.kernel;
}
} else if ( !isFunction( opts.kernel ) ) {
return new TypeError( format( 'invalid option. `%s` option must be a string denoting a known kernel function or a custom function. Option: `%s`.', 'kernel', opts.kernel ) );
}
}
return null;
}
// EXPORTS //
module.exports = validate;
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