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) 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.
*/
'use strict';
// MAIN //
/**
* Pads a strided array by repeating leading and trailing edge elements.
*
* @private
* @param {PositiveInteger} N - number of indexed elements in `x`
* @param {NonNegativeInteger} j - number of elements to pad on the leading edge
* @param {NonNegativeInteger} k - number of elements to pad on the trailing edge
* @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 {Object} y - output array object
* @param {Collection} y.data - output array data
* @param {Array<Function>} y.accessors - array element accessors
* @param {integer} strideY - stride length for `y`
* @param {NonNegativeInteger} offsetY - starting index for `y`
* @returns {Object} output array object
*
* @example
* var toAccessorArray = require( '@stdlib/array/base/to-accessor-array' );
* var arraylike2object = require( '@stdlib/array/base/arraylike2object' );
*
* var x = [ 1.0, 2.0, 3.0, 4.0 ];
* var y = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];
*
* gpadEdge( 4, 1, 1, arraylike2object( toAccessorArray( x ) ), 1, 0, arraylike2object( toAccessorArray( y ) ), 1, 0 );
* // y => [ 1.0, 1.0, 2.0, 3.0, 4.0, 4.0 ]
*/
function gpadEdge( N, j, k, x, strideX, offsetX, y, strideY, offsetY ) {
var xbuf;
var ybuf;
var get;
var set;
var ix;
var iy;
var v;
var i;
// Cache references to array data:
xbuf = x.data;
ybuf = y.data;
// Cache references to the element accessors:
get = x.accessors[ 0 ];
set = y.accessors[ 1 ];
// Fill leading edge padding:
v = get( xbuf, offsetX );
iy = offsetY;
for ( i = 0; i < j; i++ ) {
set( ybuf, iy, v );
iy += strideY;
}
// Copy input array elements:
ix = offsetX;
for ( i = 0; i < N; i++ ) {
set( ybuf, iy, get( xbuf, ix ) );
iy += strideY;
ix += strideX;
}
// Fill trailing edge padding:
v = get( xbuf, ix - strideX );
for ( i = 0; i < k; i++ ) {
set( ybuf, iy, v );
iy += strideY;
}
return y;
}
// EXPORTS //
module.exports = gpadEdge;
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