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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 clampIndex = require( '@stdlib/ndarray/base/clamp-index' );
var wrapIndex = require( '@stdlib/ndarray/base/wrap-index' );
var normalizeIndex = require( '@stdlib/ndarray/base/normalize-index' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an index given an index mode.
*
* @param {integer} idx - index
* @param {NonNegativeInteger} max - maximum index
* @param {string} mode - specifies how to handle an index outside the interval `[0,max]`
* @throws {RangeError} index out-of-bounds
* @returns {integer} index
*
* @example
* var idx = ind( 2, 9, 'clamp' );
* // returns 2
*
* idx = ind( 10, 9, 'clamp' );
* // returns 9
*
* idx = ind( -1, 9, 'clamp' );
* // returns 0
*
* @example
* var idx = ind( 2, 9, 'wrap' );
* // returns 2
*
* idx = ind( 10, 9, 'wrap' );
* // returns 0
*
* idx = ind( -1, 9, 'wrap' );
* // returns 9
*
* @example
* var idx = ind( 2, 9, 'throw' );
* // returns 2
*
* idx = ind( 10, 9, 'throw' );
* // throws <RangeError>
*
* idx = ind( -1, 9, 'throw' );
* // throws <RangeError>
*
* @example
* var idx = ind( 1, 10, 'normalize' );
* // returns 1
*
* idx = ind( -4, 10, 'normalize' );
* // returns 7
*
* idx = ind( -100, 10, 'normalize' );
* // throws <RangeError>
*/
function ind( idx, max, mode ) {
var index;
if ( mode === 'clamp' ) {
return clampIndex( idx, max );
}
if ( mode === 'wrap' ) {
return wrapIndex( idx, max );
}
index = idx;
if ( mode === 'normalize' ) {
index = normalizeIndex( index, max );
}
if ( index < 0 || index > max ) {
throw new RangeError( format( 'invalid argument. Index must resolve to a value on the interval: [0, %d]. Value: `%d`.', max, idx ) );
}
return index;
}
// EXPORTS //
module.exports = ind;
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