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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 isInteger = require( '@stdlib/math/base/assert/is-integer' );
var floor = require( '@stdlib/math/base/special/floor' );
var max = require( '@stdlib/math/base/special/max' );
var min = require( '@stdlib/math/base/special/min' );
var typeOf = require( '@stdlib/utils/type-of' );
var Uint32Array = require( '@stdlib/array/uint32' );
var Float64Array = require( '@stdlib/array/float64' );
// VARIABLES //
var hash;
// FUNCTIONS //
/**
* Copies a sequence of elements within a typed array to another location in the same array.
* Optimized implementation that copies in chunks based on the element size when possible.
*
* @private
* @param {TypedArray} arr - input typed array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @param {integer} bytesPerElement - number of bytes per element
* @returns {TypedArray} modified input array
*/
function copyWithinTypedArray( arr, target, start, end, bytesPerElement ) {
var ArrayConstructor;
var chunkCount;
var chunkArray;
var byteOffset;
var chunkSize;
var remainder;
var buffer;
var len;
var t;
var s;
var e;
var n;
var i;
len = arr.length;
// Convert target to integer and handle negative indices:
if ( isInteger( target ) ) {
t = target;
} else {
t = floor( target );
}
if ( t < 0 ) {
t = max( len + t, 0 );
} else {
t = min( t, len );
}
// Convert start to integer and handle negative indices:
if ( start === void 0 ) {
s = 0;
} else if ( isInteger( start ) ) {
s = start;
} else {
s = floor( start );
}
if ( s < 0 ) {
s = max( len + s, 0 );
} else {
s = min( s, len );
}
// Convert end to integer and handle negative indices:
if ( end === void 0 ) {
e = len;
} else if ( isInteger( end ) ) {
e = end;
} else {
e = floor( end );
}
if ( e < 0 ) {
e = max( len + e, 0 );
} else {
e = min( e, len );
}
// Calculate the number of elements to copy:
n = min( e - s, len - t );
if ( n <= 0 ) {
return arr;
}
// Determine the optimal chunk size for copying:
// For 1-byte elements, use 4-byte chunks
// For 2-byte elements, use 4-byte chunks (2 elements at a time)
// For 4-byte elements, use 4-byte chunks (1 element at a time)
// For 8-byte elements, use 8-byte chunks (1 element at a time)
if ( bytesPerElement === 1 ) {
chunkSize = 4; // Copy 4 bytes at a time for 1-byte elements
ArrayConstructor = Uint32Array;
} else if ( bytesPerElement === 2 ) {
chunkSize = 4; // Copy 4 bytes (2 elements) at a time for 2-byte elements
ArrayConstructor = Uint32Array;
} else if ( bytesPerElement === 4 ) {
chunkSize = 4; // Copy 4 bytes (1 element) at a time for 4-byte elements
ArrayConstructor = Uint32Array;
} else { // bytesPerElement === 8
chunkSize = 8; // Copy 8 bytes (1 element) at a time for 8-byte elements
ArrayConstructor = Float64Array;
}
// Check if we can use the optimized path (chunk-aligned and large enough):
if ( n >= (chunkSize / bytesPerElement) &&
(s * bytesPerElement) % chunkSize === 0 &&
(t * bytesPerElement) % chunkSize === 0 ) {
buffer = arr.buffer;
byteOffset = arr.byteOffset;
// Calculate how many chunks we can copy:
chunkCount = floor((n * bytesPerElement) / chunkSize);
remainder = n - (chunkCount * (chunkSize / bytesPerElement));
// Create a view of the same buffer with the appropriate chunk size:
chunkArray = new ArrayConstructor( buffer, byteOffset, floor((len * bytesPerElement) / chunkSize) ); // eslint-disable-line max-len
// Copy the chunks:
if ( t < s ) {
// Copy from left to right:
for ( i = 0; i < chunkCount; i++ ) {
chunkArray[((t * bytesPerElement) / chunkSize) + i] =
chunkArray[((s * bytesPerElement) / chunkSize) + i];
}
// Copy any remaining elements:
for ( i = 0; i < remainder; i++ ) {
arr[t + (chunkCount * (chunkSize / bytesPerElement)) + i] =
arr[s + (chunkCount * (chunkSize / bytesPerElement)) + i];
}
} else {
// Copy from right to left to avoid overwriting elements:
for ( i = chunkCount - 1; i >= 0; i-- ) {
chunkArray[((t * bytesPerElement) / chunkSize) + i] =
chunkArray[((s * bytesPerElement) / chunkSize) + i];
}
// Copy any remaining elements:
for ( i = remainder - 1; i >= 0; i-- ) {
arr[t + (chunkCount * (chunkSize / bytesPerElement)) + i] =
arr[s + (chunkCount * (chunkSize / bytesPerElement)) + i];
}
}
} else {
copyElementByElement( arr, t, s, n );
}
return arr;
}
/**
* Copies elements one by one within an array.
*
* @private
* @param {Array|TypedArray} arr - input array
* @param {integer} t - target index
* @param {integer} s - source index
* @param {integer} n - number of elements to copy
* @returns {Array|TypedArray} modified input array
*/
function copyElementByElement( arr, t, s, n ) {
var i;
if ( t < s ) {
// Copy from left to right:
for ( i = 0; i < n; i++ ) {
arr[t + i] = arr[s + i];
}
} else if ( t > s ) {
// Copy from right to left to avoid overwriting elements:
for ( i = n - 1; i >= 0; i-- ) {
arr[t + i] = arr[s + i];
}
}
return arr;
}
/**
* Copies a sequence of elements within an Int8Array to another location in the same array.
*
* @private
* @param {Int8Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Int8Array} modified input array
*/
function int8array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 1 );
}
/**
* Copies a sequence of elements within a Uint8Array to another location in the same array.
*
* @private
* @param {Uint8Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Uint8Array} modified input array
*/
function uint8array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 1 );
}
/**
* Copies a sequence of elements within a Uint8ClampedArray to another location in the same array.
*
* @private
* @param {Uint8ClampedArray} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Uint8ClampedArray} modified input array
*/
function uint8clampedarray( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 1 );
}
/**
* Copies a sequence of elements within an Int16Array to another location in the same array.
*
* @private
* @param {Int16Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Int16Array} modified input array
*/
function int16array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 2 );
}
/**
* Copies a sequence of elements within a Uint16Array to another location in the same array.
*
* @private
* @param {Uint16Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Uint16Array} modified input array
*/
function uint16array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 2 );
}
/**
* Copies a sequence of elements within an Int32Array to another location in the same array.
*
* @private
* @param {Int32Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Int32Array} modified input array
*/
function int32array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 4 );
}
/**
* Copies a sequence of elements within a Uint32Array to another location in the same array.
*
* @private
* @param {Uint32Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Uint32Array} modified input array
*/
function uint32array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 4 );
}
/**
* Copies a sequence of elements within a Float32Array to another location in the same array.
*
* @private
* @param {Float32Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Float32Array} modified input array
*/
function float32array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 4 );
}
/**
* Copies a sequence of elements within a Float64Array to another location in the same array.
*
* @private
* @param {Float64Array} arr - input array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {Float64Array} modified input array
*/
function float64array( arr, target, start, end ) {
return copyWithinTypedArray( arr, target, start, end, 8 );
}
/**
* Returns a hash of functions for copying within typed arrays.
*
* @private
* @returns {Object} function hash
*/
function typedarrays() {
var out = {
'Int8Array': int8array,
'Uint8Array': uint8array,
'Uint8ClampedArray': uint8clampedarray,
'Int16Array': int16array,
'Uint16Array': uint16array,
'Int32Array': int32array,
'Uint32Array': uint32array,
'Float32Array': float32array,
'Float64Array': float64array
};
return out;
}
/**
* Copies a sequence of elements within a typed array to another location in the same array.
* Uses optimized implementations based on the array type.
*
* @param {TypedArray} arr - input typed array
* @param {integer} target - target index
* @param {integer} [start=0] - source start index
* @param {integer} [end=arr.length] - source end index
* @returns {TypedArray|null} modified input array or null if not a typed array
*/
function copyWithinTypedArrays( arr, target, start, end ) {
var typedArrayCopy;
var type;
type = typeOf( arr );
typedArrayCopy = hash[ type ];
if ( typedArrayCopy ) {
return typedArrayCopy( arr, target, start, end );
}
return null;
}
// MAIN //
hash = typedarrays();
// EXPORTS //
module.exports = copyWithinTypedArrays;
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