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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 isComplex128Array = require( '@stdlib/array/base/assert/is-complex128array' );
var isComplex64Array = require( '@stdlib/array/base/assert/is-complex64array' );
var isBooleanArray = require( '@stdlib/array/base/assert/is-booleanarray' );
var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
var reinterpret128 = require( '@stdlib/strided/base/reinterpret-complex128' );
var reinterpret64 = require( '@stdlib/strided/base/reinterpret-complex64' );
var reinterpretBoolean = require( '@stdlib/strided/base/reinterpret-boolean' );
var isAlmostSameValueF32 = require( '@stdlib/number/float32/base/assert/is-almost-same-value' );
var isAlmostSameValueF64 = require( '@stdlib/number/float64/base/assert/is-almost-same-value' );
var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
// FUNCTIONS //
/**
* Tests if two arrays have respective elements which are approximately the same value within a specified number of ULPs (units in the last place).
*
* @private
* @param {Collection} x - first input array
* @param {Collection} y - second input array
* @param {NonNegativeInteger} maxULP - maximum allowed ULP difference
* @param {Function} fcn - function which tests approximate equality
* @returns {boolean} boolean indicating if both arrays have respective elements which are approximately the same value
*
* @example
* var base = require( '@stdlib/number/float64/base/assert/is-almost-same-value' );
*
* var x = [ 0, 0, 1, 0 ];
* var y = [ 0, 0, 1, 0 ];
*
* var out = internal( x, y, 1, base );
* // returns true
*
* @example
* var base = require( '@stdlib/number/float64/base/assert/is-almost-same-value' );
*
* var x = [ 0, 0, 0, 0 ];
* var y = [ 0, 0, 1, 0 ];
*
* var out = internal( x, y, 1, base );
* // returns false
*/
function internal( x, y, maxULP, fcn ) {
var i;
for ( i = 0; i < x.length; i++ ) {
if ( !fcn( x[ i ], y[ i ], maxULP ) ) {
return false;
}
}
return true;
}
/**
* Tests if two arrays have respective elements which are approximately the same value within a specified number of ULPs (units in the last place).
*
* @private
* @param {Object} x - first input array object
* @param {Object} y - second input array object
* @param {NonNegativeInteger} maxULP - maximum allowed ULP difference
* @param {Function} fcn - function which tests approximate equality
* @returns {boolean} boolean indicating if both arrays have respective elements which are approximately the same value
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
* var assert = require( '@stdlib/assert/is-almost-same-value' );
*
* var x = arraylike2object( toAccessorArray( [ 0, 0, 1, 0 ] ) );
* var y = arraylike2object( toAccessorArray( [ 0, 0, 1, 0 ] ) );
*
* var out = accessors( x, y, 0, assert );
* // returns true
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
* var assert = require( '@stdlib/assert/is-almost-same-value' );
*
* var x = arraylike2object( toAccessorArray( [ 0, 0, 0, 0 ] ) );
* var y = arraylike2object( toAccessorArray( [ 0, 0, 1, 0 ] ) );
*
* var out = accessors( x, y, 1, assert );
* // returns false
*/
function accessors( x, y, maxULP, fcn ) {
var xdata;
var ydata;
var xget;
var yget;
var i;
xdata = x.data;
ydata = y.data;
xget = x.accessors[ 0 ];
yget = y.accessors[ 0 ];
for ( i = 0; i < xdata.length; i++ ) {
if ( !fcn( xget( xdata, i ), yget( ydata, i ), maxULP ) ) {
return false;
}
}
return true;
}
// MAIN //
/**
* Tests if two arrays have respective elements which are approximately the same value within a specified number of ULPs (units in the last place).
*
* @param {Collection} x - first input array
* @param {Collection} y - second input array
* @param {NonNegativeInteger} maxULP - maximum allowed ULP difference
* @returns {boolean} boolean indicating if both arrays have respective elements which are approximately the same value
*
* @example
* var x = [ 0, 0, 1, 0 ];
* var y = [ 0, 0, 1, 0 ];
*
* var out = hasAlmostSameValues( x, y, 0 );
* // returns true
*
* @example
* var x = [ 0, 0, 0, 0 ];
* var y = [ 0, 0, 1, 0 ];
*
* var out = hasAlmostSameValues( x, y, 1 );
* // returns false
*/
function hasAlmostSameValues( x, y, maxULP ) {
var FLG;
var xo;
var yo;
var xr;
var yr;
if ( x.length !== y.length ) {
return false;
}
xo = arraylike2object( x );
yo = arraylike2object( y );
if ( xo.accessorProtocol || yo.accessorProtocol ) {
FLG = 2;
// If provided boolean arrays, reinterpret the arrays to avoid using accessors to access array elements...
if ( isBooleanArray( x ) ) {
if ( isBooleanArray( y ) ) {
return internal( reinterpretBoolean( x, 0 ), reinterpretBoolean( y, 0 ), maxULP, isAlmostSameValueF64 ); // eslint-disable-line max-len
}
return accessors( xo, yo, maxULP, isAlmostSameValue ); // general accessors should always use general comparison
}
// If provided a complex number array, reinterpret as a real typed array and test interleaved real and imaginary components...
if ( isComplex128Array( x ) ) {
xr = reinterpret128( x, 0 );
FLG -= 1;
} else if ( isComplex64Array( x ) ) {
xr = reinterpret64( x, 0 );
FLG -= 1;
}
if ( isComplex128Array( y ) ) {
yr = reinterpret128( y, 0 );
FLG -= 1;
} else if ( isComplex64Array( y ) ) {
yr = reinterpret64( y, 0 );
FLG -= 1;
}
if ( FLG === 0 ) {
// Determine whether we should use double-precision or single-precision comparison...
if ( xr.BYTES_PER_ELEMENT === 8 || yr.BYTES_PER_ELEMENT === 8 ) {
return internal( xr, yr, maxULP, isAlmostSameValueF64 );
}
return internal( xr, yr, maxULP, isAlmostSameValueF32 );
}
return accessors( xo, yo, maxULP, isAlmostSameValue ); // general accessors should always use general comparison
}
// Determine whether we should use double-precision or single-precision comparison...
if ( x.BYTES_PER_ELEMENT === 4 && y.BYTES_PER_ELEMENT === 4 ) {
return internal( x, y, maxULP, isAlmostSameValueF32 );
}
return internal( x, y, maxULP, isAlmostSameValue ); // default to general comparison
}
// EXPORTS //
module.exports = hasAlmostSameValues;
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