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* @license Apache-2.0
*
* Copyright (c) 2026 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.
*/
/* eslint-disable max-params, max-len */
'use strict';
// MODULES //
var gcopy = require( '@stdlib/blas/base/gcopy' );
// MAIN //
/**
* Calculates the differences between consecutive elements of a strided array using alternative indexing semantics and accessors.
*
* @private
* @param {PositiveInteger} N - number of indexed elements
* @param {Object} x - input array object
* @param {Collection} x.data - input array data
* @param {Array<Function>} x.accessors - array element accessors
* @param {integer} strideX - stride length for `x`
* @param {NonNegativeInteger} offsetX - starting index for `x`
* @param {PositiveInteger} N1 - number of indexed elements of prepend
* @param {Object} prepend - prepend array object
* @param {Collection} prepend.data - prepend array data
* @param {Array<Function>} prepend.accessors - array element accessors
* @param {integer} strideP - stride length for `prepend`
* @param {NonNegativeInteger} offsetP - starting index for `prepend`
* @param {PositiveInteger} N2 - number of indexed elements of append
* @param {Object} append - append array object
* @param {Collection} append.data - append array data
* @param {Array<Function>} append.accessors - array element accessors
* @param {integer} strideA - stride length for `append`
* @param {NonNegativeInteger} offsetA - starting index for `append`
* @param {Object} out - output array object
* @param {Collection} out.data - output array data
* @param {Array<Function>} out.accessors - array element accessors
* @param {integer} strideOut - stride length for `out`
* @param {NonNegativeInteger} offsetOut - starting index for `out`
* @returns {Object} output array object
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 4.0, 8.0, 12.0, 16.0, 20.0 ];
* var p = [ 10.0, 15.0 ];
* var a = [ 30.0, 35.0 ];
* var o = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gediff( 5, arraylike2object( toAccessorArray( x ) ), 1, 0, 2, arraylike2object( toAccessorArray( p ) ), 1, 0, 2, arraylike2object( toAccessorArray( a ) ), 1, 0, arraylike2object( toAccessorArray( o ) ), 1, 0 );
* // o => [ 10.0, 15.0, 4.0, 4.0, 4.0, 4.0, 30.0, 35.0 ]
*/
function gediff( N, x, strideX, offsetX, N1, prepend, strideP, offsetP, N2, append, strideA, offsetA, out, strideOut, offsetOut ) {
var xbuf;
var obuf;
var oset;
var xget;
var prev;
var curr;
var ix;
var io;
var i;
xbuf = x.data;
obuf = out.data;
xget = x.accessors[ 0 ];
oset = out.accessors[ 1 ];
// Copy `prepend` into output array:
gcopy.ndarray( N1, prepend.data, strideP, offsetP, obuf, strideOut, offsetOut );
// Compute differences of input array:
ix = offsetX;
io = offsetOut + ( N1 * strideOut );
prev = xget( xbuf, ix );
for ( i = 1; i < N; i++ ) {
ix += strideX;
curr = xget( xbuf, ix );
oset( obuf, io, curr - prev );
prev = curr;
io += strideOut;
}
// Copy `append` into output array:
gcopy.ndarray( N2, append.data, strideA, offsetA, obuf, strideOut, io );
return out;
}
// EXPORTS //
module.exports = gediff;
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