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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';
// MODULES //
var hasIteratorSymbolSupport = require( '@stdlib/assert/has-iterator-symbol-support' );
var isBigInt = require( '@stdlib/assert/is-bigint' ).isPrimitive;
var isNonNegativeInteger = require( '@stdlib/assert/is-nonnegative-integer' ).isPrimitive;
var isIntegerPrimitive = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isCollection = require( '@stdlib/assert/is-collection' );
var isArrayBuffer = require( '@stdlib/assert/is-arraybuffer' );
var isObject = require( '@stdlib/assert/is-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var isInt64 = require( '@stdlib/assert/is-int64' );
var isInteger = require( '@stdlib/math/base/assert/is-integer' );
var ITERATOR_SYMBOL = require( '@stdlib/symbol/iterator' );
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
var accessorGetter = require( '@stdlib/array/base/accessor-getter' );
var getter = require( '@stdlib/array/base/getter' );
var Uint32Array = require( '@stdlib/array/uint32' );
var Number = require( '@stdlib/number/ctor' );
var Int64 = require( '@stdlib/number/int64/ctor' );
var toWords = require( '@stdlib/number/int64/base/to-words' ).assign;
var format = require( '@stdlib/string/format' );
var indices = require( './indices.js' );
var fromIterator = require( './from_iterator.js' );
var fromIteratorMap = require( './from_iterator_map.js' );
var fromArray = require( './from_array.js' );
// VARIABLES //
var BYTES_PER_ELEMENT = Uint32Array.BYTES_PER_ELEMENT * 2;
var HAS_ITERATOR_SYMBOL = hasIteratorSymbolSupport();
// FUNCTIONS //
/**
* Returns a boolean indicating if a value is a 64-bit signed integer array.
*
* @private
* @param {*} value - value to test
* @returns {boolean} boolean indicating if a value is a signed typed array
*/
function isInt64Array( value ) {
return (
value instanceof Int64Array ||
(
typeof value === 'object' &&
value !== null &&
value.constructor.name === 'Int64Array' &&
value.BYTES_PER_ELEMENT === BYTES_PER_ELEMENT &&
typeof value._length === 'number' && // eslint-disable-line no-underscore-dangle
// NOTE: we don't perform a more rigorous test here for a typed array for performance reasons, as robustly checking for a typed array instance could require walking the prototype tree and performing relatively expensive constructor checks...
typeof value._buffer === 'object' // eslint-disable-line no-underscore-dangle
)
);
}
/**
* Returns a boolean indicating if a value is a 64-bit signed integer typed array constructor.
*
* @private
* @param {*} value - value to test
* @returns {boolean} boolean indicating if a value is a 64-bit signed integer typed array constructor
*/
function isInt64ArrayConstructor( value ) {
return ( value === Int64Array );
}
/**
* Retrieves a 64-bit signed integer from a 32-bit unsigned integer array buffer.
*
* @private
* @param {Uint32Array} buf - array buffer
* @param {NonNegativeInteger} idx - element index
* @returns {Int64} 64-bit signed integer
*/
function getInt64( buf, idx ) {
idx *= 2;
return Int64.of( buf[ idx+indices.HIGH ], buf[ idx+indices.LOW ] );
}
// MAIN //
/**
* 64-bit signed integer array constructor.
*
* @constructor
* @param {(NonNegativeInteger|Collection|ArrayBuffer|Iterable)} [arg] - length, typed array, array-like object, buffer, or iterable
* @param {NonNegativeInteger} [byteOffset=0] - byte offset
* @param {NonNegativeInteger} [length] - view length
* @throws {RangeError} ArrayBuffer byte length must be a multiple of `8`
* @throws {TypeError} if provided only a single argument, must provide a valid argument
* @throws {TypeError} byte offset must be a nonnegative integer
* @throws {RangeError} byte offset must be a multiple of `8`
* @throws {TypeError} view length must be a positive multiple of `8`
* @throws {RangeError} must provide sufficient memory to accommodate byte offset and view length requirements
* @throws {TypeError} an array element must be either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer
* @throws {TypeError} an iterator must return either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer
* @returns {Int64Array} 64-bit signed integer array
*
* @example
* var arr = new Int64Array();
* // returns <Int64Array>
*
* var len = arr.length;
* // returns 0
*
* @example
* var arr = new Int64Array( 2 );
* // returns <Int64Array>[ 0n, 0n ]
*
* var len = arr.length;
* // returns 2
*
* @example
* var arr = new Int64Array( [ 1, 2 ] );
* // returns <Int64Array>[ 1n, 2n ]
*
* var len = arr.length;
* // returns 2
*
* @example
* var arr = new Int64Array( [ -1, -2 ] );
* // returns <Int64Array>[ -1n, -2n ]
*
* var len = arr.length;
* // returns 2
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* var buf = new ArrayBuffer( 32 );
* var arr = new Int64Array( buf );
* // returns <Int64Array>[ 0n, 0n, 0n, 0n ]
*
* var len = arr.length;
* // returns 4
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* var buf = new ArrayBuffer( 32 );
* var arr = new Int64Array( buf, 16 );
* // returns <Int64Array>[ 0n, 0n ]
*
* var len = arr.length;
* // returns 2
*
* @example
* var ArrayBuffer = require( '@stdlib/array/buffer' );
*
* var buf = new ArrayBuffer( 64 );
* var arr = new Int64Array( buf, 16, 2 );
* // returns <Int64Array>[ 0n, 0n ]
*
* var len = arr.length;
* // returns 2
*/
function Int64Array() {
var byteOffset;
var nargs;
var buf;
var len;
var tmp;
var arg;
var i;
nargs = arguments.length;
if ( !(this instanceof Int64Array) ) {
if ( nargs === 0 ) {
return new Int64Array();
}
if ( nargs === 1 ) {
return new Int64Array( arguments[0] );
}
if ( nargs === 2 ) {
return new Int64Array( arguments[0], arguments[1] );
}
return new Int64Array( arguments[0], arguments[1], arguments[2] );
}
// Create the underlying data buffer...
if ( nargs === 0 ) {
buf = new Uint32Array( 0 ); // backward-compatibility
} else if ( nargs === 1 ) {
arg = arguments[ 0 ];
if ( isNonNegativeInteger( arg ) ) {
buf = new Uint32Array( arg*2 );
} else if ( isCollection( arg ) ) {
len = arg.length;
if ( isInt64Array( arg ) ) {
// Source is already arranged as high/low words, so just copy buffer to buffer:
buf = new Uint32Array( arg._buffer ); // eslint-disable-line no-underscore-dangle
} else {
// Assume that every element represents a single 64-bit signed integer:
buf = fromArray( new Uint32Array( len*2 ), arg );
if ( buf instanceof Error ) {
throw buf;
}
}
} else if ( isArrayBuffer( arg ) ) {
if ( !isInteger( arg.byteLength/BYTES_PER_ELEMENT ) ) {
throw new RangeError( format( 'invalid argument. ArrayBuffer byte length must be a multiple of %u. Byte length: `%u`.', BYTES_PER_ELEMENT, arg.byteLength ) );
}
buf = new Uint32Array( arg );
} else if ( isObject( arg ) ) {
buf = arg;
if ( HAS_ITERATOR_SYMBOL === false ) {
throw new TypeError( format( 'invalid argument. Environment lacks Symbol.iterator support. Must provide a length, ArrayBuffer, typed array, or array-like object. Value: `%s`.', buf ) );
}
if ( !isFunction( buf[ ITERATOR_SYMBOL ] ) ) {
throw new TypeError( format( 'invalid argument. Must provide a length, ArrayBuffer, typed array, array-like object, or an iterable. Value: `%s`.', buf ) );
}
buf = buf[ ITERATOR_SYMBOL ]();
if ( !isFunction( buf.next ) ) {
throw new TypeError( format( 'invalid argument. Must provide a length, ArrayBuffer, typed array, array-like object, or an iterable. Value: `%s`.', buf ) );
}
buf = fromIterator( buf );
if ( buf instanceof Error ) {
throw buf;
}
len = buf.length;
tmp = new Uint32Array( len );
for ( i = 0; i < len; i += 2 ) {
tmp[ i+indices.HIGH ] = buf[ i ];
tmp[ i+indices.LOW ] = buf[ i+1 ];
}
buf = tmp;
} else {
throw new TypeError( format( 'invalid argument. Must provide a length, ArrayBuffer, typed array, array-like object, or an iterable. Value: `%s`.', arg ) );
}
} else {
buf = arguments[ 0 ];
if ( !isArrayBuffer( buf ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an ArrayBuffer. Value: `%s`.', buf ) );
}
byteOffset = arguments[ 1 ];
if ( !isNonNegativeInteger( byteOffset ) ) {
throw new TypeError( format( 'invalid argument. Byte offset must be a nonnegative integer. Value: `%s`.', byteOffset ) );
}
if ( !isInteger( byteOffset/BYTES_PER_ELEMENT ) ) {
throw new RangeError( format( 'invalid argument. Byte offset must be a multiple of %u. Value: `%u`.', BYTES_PER_ELEMENT, byteOffset ) );
}
if ( nargs === 2 ) {
len = buf.byteLength - byteOffset;
if ( !isInteger( len/BYTES_PER_ELEMENT ) ) {
throw new RangeError( format( 'invalid arguments. ArrayBuffer view byte length must be a multiple of %u. View byte length: `%u`.', BYTES_PER_ELEMENT, len ) );
}
buf = new Uint32Array( buf, byteOffset );
} else {
len = arguments[ 2 ];
if ( !isNonNegativeInteger( len ) ) {
throw new TypeError( format( 'invalid argument. Length must be a nonnegative integer. Value: `%s`.', len ) );
}
if ( (len*BYTES_PER_ELEMENT) > (buf.byteLength-byteOffset) ) {
throw new RangeError( format( 'invalid arguments. ArrayBuffer has insufficient capacity. Either decrease the array length or provide a bigger buffer. Minimum capacity: `%u`.', len*BYTES_PER_ELEMENT ) );
}
buf = new Uint32Array( buf, byteOffset, len*2 );
}
}
setReadOnly( this, '_buffer', buf );
setReadOnly( this, '_length', buf.length/2 );
return this;
}
/**
* Size (in bytes) of each array element.
*
* @name BYTES_PER_ELEMENT
* @memberof Int64Array
* @readonly
* @type {PositiveInteger}
* @default 8
*
* @example
* var nbytes = Int64Array.BYTES_PER_ELEMENT;
* // returns 8
*/
setReadOnly( Int64Array, 'BYTES_PER_ELEMENT', BYTES_PER_ELEMENT );
/**
* Constructor name.
*
* @name name
* @memberof Int64Array
* @readonly
* @type {string}
* @default 'Int64Array'
*
* @example
* var name = Int64Array.name;
* // returns 'Int64Array'
*/
setReadOnly( Int64Array, 'name', 'Int64Array' );
/**
* Creates a new 64-bit signed integer array from an array-like object or an iterable.
*
* @name from
* @memberof Int64Array
* @type {Function}
* @param {(Collection|Object)} src - array-like object or iterable
* @param {Function} [clbk] - callback to invoke for each source element
* @param {*} [thisArg] - context
* @throws {TypeError} `this` context must be a constructor
* @throws {TypeError} `this` must be a 64-bit signed integer array
* @throws {TypeError} first argument must be an array-like object or an iterable
* @throws {TypeError} second argument must be a function
* @throws {TypeError} an array element must be either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer
* @throws {TypeError} an iterator must return either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer
* @throws {TypeError} when provided an iterator, a callback must return either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer
* @returns {Int64Array} 64-bit signed integer array
*
* @example
* var arr = Int64Array.from( [ 1, 2, 3 ] );
* // returns <Int64Array>[ 1n, 2n, 3n ]
*
* var len = arr.length;
* // returns 3
*
* @example
* var Int64 = require( '@stdlib/number/int64/ctor' );
*
* var arr = Int64Array.from( [ new Int64( 1 ) ] );
* // returns <Int64Array>[ 1n ]
*
* var len = arr.length;
* // returns 1
*
* @example
* var Int64 = require( '@stdlib/number/int64/ctor' );
* var identity = require( '@stdlib/number/int64/base/identity' );
*
* function clbk( v ) {
* return identity( v );
* }
*
* var arr = Int64Array.from( [ new Int64( 1 ) ], clbk );
* // returns <Int64Array>[ 1n ]
*
* var len = arr.length;
* // returns 1
*
* @example
* var arr = Int64Array.from( [ -1, -2, -3 ] );
* // returns <Int64Array>[ -1n, -2n, -3n ]
*
* var len = arr.length;
* // returns 3
*/
setReadOnly( Int64Array, 'from', function from( src ) {
var thisArg;
var nargs;
var words;
var clbk;
var out;
var buf;
var tmp;
var get;
var len;
var v;
var i;
var j;
if ( !isFunction( this ) ) {
throw new TypeError( 'invalid invocation. `this` context must be a constructor.' );
}
if ( !isInt64ArrayConstructor( this ) ) {
throw new TypeError( 'invalid invocation. `this` is not a 64-bit signed integer array.' );
}
nargs = arguments.length;
if ( nargs > 1 ) {
clbk = arguments[ 1 ];
if ( !isFunction( clbk ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a function. Value: `%s`.', clbk ) );
}
if ( nargs > 2 ) {
thisArg = arguments[ 2 ];
}
}
if ( isCollection( src ) ) {
if ( clbk ) {
len = src.length;
if ( src.get && src.set ) {
get = accessorGetter( 'default' );
} else {
get = getter( 'default' );
}
out = new this( len );
buf = out._buffer; // eslint-disable-line no-underscore-dangle
words = [ 0, 0 ];
j = 0;
for ( i = 0; i < len; i++ ) {
v = clbk.call( thisArg, get( src, i ), i );
if ( !isInt64( v ) ) {
try {
v = new Int64( v );
} catch ( err ) { // eslint-disable-line no-unused-vars
throw new TypeError( format( 'invalid argument. A callback must return either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer. Value: `%s`.', v ) );
}
}
toWords( v, words, 1, 0 );
buf[ j+indices.HIGH ] = words[ 0 ];
buf[ j+indices.LOW ] = words[ 1 ];
j += 2; // stride
}
return out;
}
return new this( src );
}
if ( isObject( src ) && HAS_ITERATOR_SYMBOL && isFunction( src[ ITERATOR_SYMBOL ] ) ) { // eslint-disable-line max-len
buf = src[ ITERATOR_SYMBOL ]();
if ( !isFunction( buf.next ) ) {
throw new TypeError( format( 'invalid argument. First argument must be an array-like object or an iterable. Value: `%s`.', src ) );
}
if ( clbk ) {
tmp = fromIteratorMap( buf, clbk, thisArg );
} else {
tmp = fromIterator( buf );
}
if ( tmp instanceof Error ) {
throw tmp;
}
len = tmp.length / 2;
out = new this( len );
buf = out._buffer; // eslint-disable-line no-underscore-dangle
for ( i = 0; i < tmp.length; i += 2 ) {
buf[ i+indices.HIGH ] = tmp[ i ];
buf[ i+indices.LOW ] = tmp[ i+1 ];
}
return out;
}
throw new TypeError( format( 'invalid argument. First argument must be an array-like object or an iterable. Value: `%s`.', src ) );
});
/**
* Creates a new 64-bit signed integer array from a variable number of arguments.
*
* @name of
* @memberof Int64Array
* @type {Function}
* @param {...*} element - array elements
* @throws {TypeError} `this` context must be a constructor
* @throws {TypeError} `this` must be a 64-bit signed integer array
* @returns {Int64Array} 64-bit signed integer array
*
* @example
* var arr = Int64Array.of( 1, 2, 3, 4 );
* // returns <Int64Array>[ 1n, 2n, 3n, 4n ]
*
* var len = arr.length;
* // returns 4
*
* @example
* var arr = Int64Array.of( -1, -2, -3, -4 );
* // returns <Int64Array>[ -1n, -2n, -3n, -4n ]
*
* var len = arr.length;
* // returns 4
*/
setReadOnly( Int64Array, 'of', function of() {
var args;
var i;
if ( !isFunction( this ) ) {
throw new TypeError( 'invalid invocation. `this` context must be a constructor.' );
}
if ( !isInt64ArrayConstructor( this ) ) {
throw new TypeError( 'invalid invocation. `this` is not a 64-bit signed integer array.' );
}
args = [];
for ( i = 0; i < arguments.length; i++ ) {
args.push( arguments[ i ] );
}
return new this( args );
});
/**
* Returns an array element located at integer position (index) `i`, with support for both nonnegative and negative integer indices.
*
* @name at
* @memberof Int64Array.prototype
* @type {Function}
* @param {integer} idx - element index
* @throws {TypeError} `this` must be a 64-bit signed integer array
* @throws {TypeError} must provide an integer
* @returns {(Int64|void)} array element
*
* @example
* var arr = new Int64Array( 10 );
*
* var u = arr.at( 0 );
* // returns <Int64>[ 0n ]
*
* arr.set( 1, 0 );
* arr.set( 2, 1 );
* arr.set( 9, 9 );
*
* u = arr.at( 0 );
* // returns <Int64>[ 1n ]
*
* u = arr.at( -1 );
* // returns <Int64>[ 9n ]
*
* u = arr.at( 100 );
* // returns undefined
*
* u = arr.at( -100 );
* // returns undefined
*/
setReadOnly( Int64Array.prototype, 'at', function at( idx ) {
if ( !isInt64Array( this ) ) {
throw new TypeError( 'invalid invocation. `this` is not a 64-bit signed integer array.' );
}
if ( !isInteger( idx ) ) {
throw new TypeError( format( 'invalid argument. Must provide an integer. Value: `%s`.', idx ) );
}
if ( idx < 0 ) {
idx += this._length;
}
if ( idx < 0 || idx >= this._length ) {
return;
}
return getInt64( this._buffer, idx );
});
/**
* Pointer to the underlying data buffer.
*
* @name buffer
* @memberof Int64Array.prototype
* @readonly
* @type {ArrayBuffer}
*
* @example
* var arr = new Int64Array( 10 );
*
* var buf = arr.buffer;
* // returns <ArrayBuffer>
*/
setReadOnlyAccessor( Int64Array.prototype, 'buffer', function get() {
return this._buffer.buffer;
});
/**
* Size (in bytes) of the array.
*
* @name byteLength
* @memberof Int64Array.prototype
* @readonly
* @type {NonNegativeInteger}
*
* @example
* var arr = new Int64Array( 10 );
*
* var byteLength = arr.byteLength;
* // returns 80
*/
setReadOnlyAccessor( Int64Array.prototype, 'byteLength', function get() {
return this._buffer.byteLength;
});
/**
* Offset (in bytes) of the array from the start of its underlying `ArrayBuffer`.
*
* @name byteOffset
* @memberof Int64Array.prototype
* @readonly
* @type {NonNegativeInteger}
*
* @example
* var arr = new Int64Array( 10 );
*
* var byteOffset = arr.byteOffset;
* // returns 0
*/
setReadOnlyAccessor( Int64Array.prototype, 'byteOffset', function get() {
return this._buffer.byteOffset;
});
/**
* Size (in bytes) of each array element.
*
* @name BYTES_PER_ELEMENT
* @memberof Int64Array.prototype
* @readonly
* @type {PositiveInteger}
* @default 8
*
* @example
* var arr = new Int64Array( 10 );
*
* var nbytes = arr.BYTES_PER_ELEMENT;
* // returns 8
*/
setReadOnly( Int64Array.prototype, 'BYTES_PER_ELEMENT', Int64Array.BYTES_PER_ELEMENT );
/**
* Returns an iterator for iterating over array key-value pairs.
*
* @name entries
* @memberof Int64Array.prototype
* @type {Function}
* @throws {TypeError} `this` must be a 64-bit signed integer array
* @returns {Iterator} iterator
*
* @example
* var Int64 = require( '@stdlib/number/int64/ctor' );
*
* var arr = [
* new Int64( 1 ),
* new Int64( 2 ),
* new Int64( 3 )
* ];
* arr = new Int64Array( arr );
*
* // Create an iterator:
* var it = arr.entries();
*
* // Iterate over the key-value pairs...
* var v = it.next().value;
* // returns [ 0, <Int64>[ 1n ] ]
*
* v = it.next().value;
* // returns [ 1, <Int64>[ 2n ] ]
*
* v = it.next().value;
* // returns [ 2, <Int64>[ 3n ] ]
*
* var bool = it.next().done;
* // returns true
*/
setReadOnly( Int64Array.prototype, 'entries', function entries() {
var buffer;
var self;
var iter;
var len;
var FLG;
var i;
if ( !isInt64Array( this ) ) {
throw new TypeError( 'invalid invocation. `this` is not a 64-bit signed integer array.' );
}
self = this;
buffer = this._buffer;
len = this._length;
// Initialize an iteration index:
i = -1;
// Create an iterator protocol-compliant object:
iter = {};
setReadOnly( iter, 'next', next );
setReadOnly( iter, 'return', end );
if ( ITERATOR_SYMBOL ) {
setReadOnly( iter, ITERATOR_SYMBOL, factory );
}
return iter;
/**
* Returns an iterator protocol-compliant object containing the next iterated value.
*
* @private
* @returns {Object} iterator protocol-compliant object
*/
function next() {
i += 1;
if ( FLG || i >= len ) {
return {
'done': true
};
}
return {
'value': [ i, getInt64( buffer, i ) ],
'done': false
};
}
/**
* Finishes an iterator.
*
* @private
* @param {*} [value] - value to return
* @returns {Object} iterator protocol-compliant object
*/
function end( value ) {
FLG = true;
if ( arguments.length ) {
return {
'value': value,
'done': true
};
}
return {
'done': true
};
}
/**
* Returns a new iterator.
*
* @private
* @returns {Iterator} iterator
*/
function factory() {
return self.entries();
}
});
/**
* Returns an array element.
*
* @name get
* @memberof Int64Array.prototype
* @type {Function}
* @param {NonNegativeInteger} idx - element index
* @throws {TypeError} `this` must be a 64-bit signed integer array
* @throws {TypeError} must provide a nonnegative integer
* @returns {(Int64|void)} array element
*
* @example
* var arr = new Int64Array( 10 );
*
* var z = arr.get( 0 );
* // returns <Int64>[ 0n ]
*
* arr.set( [ 1 ], 0 );
*
* z = arr.get( 0 );
* // returns <Int64>[ 1n ]
*
* z = arr.get( 100 );
* // returns undefined
*/
setReadOnly( Int64Array.prototype, 'get', function get( idx ) {
if ( !isInt64Array( this ) ) {
throw new TypeError( 'invalid invocation. `this` is not a 64-bit signed integer array.' );
}
if ( !isNonNegativeInteger( idx ) ) {
throw new TypeError( format( 'invalid argument. Must provide a nonnegative integer. Value: `%s`.', idx ) );
}
if ( idx >= this._length ) {
return;
}
return getInt64( this._buffer, idx );
});
/**
* Number of array elements.
*
* @name length
* @memberof Int64Array.prototype
* @readonly
* @type {NonNegativeInteger}
*
* @example
* var arr = new Int64Array( 10 );
*
* var len = arr.length;
* // returns 10
*/
setReadOnlyAccessor( Int64Array.prototype, 'length', function get() {
return this._length;
});
/**
* Sets an array element.
*
* ## Notes
*
* - When provided a typed array, we must check whether the source array shares the same buffer as the target array and whether the underlying memory overlaps. In particular, we are concerned with the following scenario:
*
* ```text
* buf: ---------------------
* src: ---------------------
* ```
*
* In the above, as we copy values from `src`, we will overwrite values in the `src` view, resulting in duplicated values copied into the end of `buf`, which is not intended. Hence, to avoid overwriting source values, we must **copy** source values to a temporary array.
*
* In the other overlapping scenario,
*
* ```text
* buf: ---------------------
* src: ---------------------
* ```
*
* by the time we begin copying into the overlapping region, we are copying from the end of `src`, a non-overlapping region, which means we don't run the risk of copying copied values, rather than the original `src` values as intended.
*
* @name set
* @memberof Int64Array.prototype
* @type {Function}
* @param {(Collection|Int64Array|Int64|bigint|number)} value - value(s)
* @param {NonNegativeInteger} [i=0] - element index at which to start writing values
* @throws {TypeError} `this` must be a 64-bit signed integer array
* @throws {TypeError} index argument must be a nonnegative integer
* @throws {RangeError} index argument is out-of-bounds
* @throws {RangeError} target array lacks sufficient storage to accommodate source values
* @throws {TypeError} an array element must be either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer
* @throws {TypeError} first argument must be either a 64-bit signed integer, a value which can be converted to a 64-bit signed integer, a 64-bit signed integer array, or an array-like object containing 64-bit signed integers or values which can be converted to a 64-bit signed integers
* @returns {void}
*
* @example
* var arr = new Int64Array( 10 );
*
* var z = arr.get( 0 );
* // returns <Int64>[ 0n ]
*
* arr.set( 1n, 0 );
*
* z = arr.get( 0 );
* // returns <Int64>[ 1n ]
*
* @example
* var arr = new Int64Array( 10 );
*
* arr.set( -1, 0 );
*
* var z = arr.get( 0 );
* // returns <Int64>[ -1n ]
*
* arr.set( -2n, 1 );
*
* z = arr.get( 1 );
* // returns <Int64>[ -2n ]
*
* arr.set( [ -3, -4 ], 2 );
*
* z = arr.get( 3 );
* // returns <Int64>[ -4n ]
*/
setReadOnly( Int64Array.prototype, 'set', function set( value ) {
/* eslint-disable no-underscore-dangle */
var words;
var sbuf;
var idx;
var buf;
var tmp;
var N;
var v;
var i;
var j;
if ( !isInt64Array( this ) ) {
throw new TypeError( 'invalid invocation. `this` is not a 64-bit signed integer array.' );
}
buf = this._buffer;
if ( arguments.length > 1 ) {
idx = arguments[ 1 ];
if ( !isNonNegativeInteger( idx ) ) {
throw new TypeError( format( 'invalid argument. Index argument must be a nonnegative integer. Value: `%s`.', idx ) );
}
} else {
idx = 0;
}
words = [ 0, 0 ];
if ( isInt64( value ) ) {
if ( idx >= this._length ) {
throw new RangeError( format( 'invalid argument. Index argument is out-of-bounds. Value: `%u`.', idx ) );
}
idx *= 2;
toWords( value, words, 1, 0 );
buf[ idx+indices.HIGH ] = words[ 0 ];
buf[ idx+indices.LOW ] = words[ 1 ];
return;
}
if ( isIntegerPrimitive( value ) || ( isBigInt( value ) && isIntegerPrimitive( Number( value ) ) ) ) {
if ( idx >= this._length ) {
throw new RangeError( format( 'invalid argument. Index argument is out-of-bounds. Value: `%u`.', idx ) );
}
value = new Int64( value );
idx *= 2;
toWords( value, words, 1, 0 );
buf[ idx+indices.HIGH ] = words[ 0 ];
buf[ idx+indices.LOW ] = words[ 1 ];
return;
}
if ( isInt64Array( value ) ) {
N = value._length;
if ( idx+N > this._length ) {
throw new RangeError( 'invalid arguments. Target array lacks sufficient storage to accommodate source values.' );
}
sbuf = value._buffer;
// Check for overlapping memory...
j = buf.byteOffset + (idx*BYTES_PER_ELEMENT);
if (
sbuf.buffer === buf.buffer &&
(
sbuf.byteOffset < j &&
sbuf.byteOffset+sbuf.byteLength > j
)
) {
// We need to copy source values...
tmp = new Uint32Array( sbuf.length );
for ( i = 0; i < sbuf.length; i++ ) {
tmp[ i ] = sbuf[ i ];
}
sbuf = tmp;
}
idx *= 2;
j = 0;
for ( i = 0; i < N; i++ ) {
buf[ idx+indices.HIGH ] = sbuf[ j+indices.HIGH ];
buf[ idx+indices.LOW ] = sbuf[ j+indices.LOW ];
idx += 2; // stride
j += 2; // stride
}
return;
}
if ( isCollection( value ) ) {
N = value.length;
if ( idx+N > this._length ) {
throw new RangeError( 'invalid arguments. Target array lacks sufficient storage to accommodate source values.' );
}
sbuf = value;
// Check for overlapping memory...
j = buf.byteOffset + (idx*BYTES_PER_ELEMENT);
if (
sbuf.buffer === buf.buffer &&
(
sbuf.byteOffset < j &&
sbuf.byteOffset+sbuf.byteLength > j
)
) {
// We need to copy source values...
tmp = [];
for ( i = 0; i < sbuf.length; i++ ) {
tmp.push( sbuf[ i ] ); // TODO: handle accessor arrays
}
sbuf = tmp;
}
idx *= 2;
for ( i = 0; i < N; i++ ) {
v = sbuf[ i ];
if ( !isInt64( v ) ) {
try {
v = new Int64( v );
} catch ( err ) { // eslint-disable-line no-unused-vars
throw new TypeError( format( 'invalid argument. An array element must be either a 64-bit signed integer or a value which can be converted to a 64-bit signed integer. Value: `%s`.', v ) );
}
}
toWords( v, words, 1, 0 );
buf[ idx+indices.HIGH ] = words[ 0 ];
buf[ idx+indices.LOW ] = words[ 1 ];
idx += 2; // stride
}
return;
}
throw new TypeError( format( 'invalid argument. First argument must be either a 64-bit signed integer, a value which can be converted to a 64-bit signed integer, a 64-bit signed integer array, or an array-like object containing 64-bit signed integers or values which can be converted to a 64-bit signed integers. Value: `%s`.', value ) );
/* eslint-enable no-underscore-dangle */
});
// EXPORTS //
module.exports = Int64Array;
|