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* @license Apache-2.0
*
* Copyright (c) 2025 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 isnan = require( '@stdlib/math/base/assert/is-nanf' );
var trunc = require( '@stdlib/math/base/special/truncf' );
var float64ToFloat32 = require( '@stdlib/number/float64/base/to-float32' );
// MAIN //
/**
* Wraps a value on the half-open interval `[min,max)`.
*
* @param {number} v - input value
* @param {number} min - minimum value
* @param {number} max - maximum value
* @returns {number} wrapped value
*
* @example
* var v = wrapf( 3.14, 0.0, 5.0 );
* // returns ~3.14
*
* v = wrapf( -3.14, 0.0, 5.0 );
* // returns ~1.86
*
* v = wrapf( 10.0, 0.0, 5.0 );
* // returns 0.0
*
* v = wrapf( -0.0, 0.0, 5.0 );
* // returns 0.0
*
* v = wrapf( 0.0, -0.0, 5.0 );
* // returns 0.0
*
* v = wrapf( NaN, 0.0, 5.0 );
* // returns NaN
*
* v = wrapf( 0.0, NaN, 5.0 );
* // returns NaN
*
* v = wrapf( 3.14, 0.0, NaN );
* // returns NaN
*
* v = wrapf( 3.14, 5.0, 0.0 );
* // returns NaN
*/
function wrapf( v, min, max ) {
var delta;
if (
isnan( v ) ||
isnan( min ) ||
isnan( max ) ||
max <= min
) {
return NaN;
}
// Normalize +-0 to +0...
if ( v === 0.0 ) {
v = 0.0;
}
if ( min === 0.0 ) {
min = 0.0;
}
if ( max === 0.0 ) {
max = 0.0;
}
// Simple case where value is already within range...
if ( min <= v && v < max ) {
return float64ToFloat32(v);
}
// Perform range reduction...
delta = float64ToFloat32(max) - float64ToFloat32(min);
if ( v < min ) {
v += float64ToFloat32(delta) * ( trunc( ( float64ToFloat32(min) - float64ToFloat32(v) ) / float64ToFloat32(delta) ) + 1.0 ); // eslint-disable-line max-len
}
return float64ToFloat32(min) + ( ( float64ToFloat32(v) - float64ToFloat32(min) ) % float64ToFloat32(delta) ); // eslint-disable-line max-len
}
// EXPORTS //
module.exports = wrapf;
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