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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-len, no-restricted-syntax, no-invalid-this */
'use strict';
// MODULES //
var hasBigIntSupport = require( '@stdlib/assert/has-bigint-support' );
var hasToPrimitiveSymbolSupport = require( '@stdlib/assert/has-to-primitive-symbol-support' ); // eslint-disable-line id-length
var isUint32Array = require( '@stdlib/assert/is-uint32array' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isBigInt = require( '@stdlib/assert/is-bigint' ).isPrimitive;
var isCollection = require( '@stdlib/assert/is-collection' );
var isBetween = require( '@stdlib/assert/is-between' );
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var setReadOnlyAccessor = require( '@stdlib/utils/define-nonenumerable-read-only-accessor' );
var BigInt = require( '@stdlib/bigint/ctor' );
var Number = require( '@stdlib/number/ctor' );
var Uint32Array = require( '@stdlib/array/uint32' );
var join = require( '@stdlib/array/base/join' );
var UINT32_MAX = require( '@stdlib/constants/uint32/max' );
var MAX_SAFE_INTEGER = require( '@stdlib/constants/float64/max-safe-integer' );
var MIN_SAFE_INTEGER = require( '@stdlib/constants/float64/min-safe-integer' );
var format = require( '@stdlib/string/format' );
var ToPrimitiveSymbol = require( '@stdlib/symbol/to-primitive' );
var indices = require( './indices.js' );
var int2str = require( './to_string.js' );
// VARIABLES //
var HAS_BIGINT = hasBigIntSupport();
var TWO_32 = 0x100000000; // 2^32
// MAIN //
/**
* 64-bit signed integer constructor.
*
* @constructor
* @param {(number|bigint)} value - integer value
* @throws {TypeError} must invoke using the `new` keyword
* @throws {TypeError} must provide a valid number
* @returns {Int64} 64-bit signed integer
*
* @example
* var v = new Int64( 5 );
* // returns <Int64>
*/
function Int64( value ) {
var buffer;
var v;
if ( !( this instanceof Int64 ) ) {
throw new TypeError( 'invalid invocation. Constructor must be called with the `new` keyword.' );
}
buffer = new Uint32Array( 2 );
if ( isBigInt( value ) ) {
if ( BigInt.asIntN( 64, value ) !== value ) {
throw new TypeError( format( 'invalid argument. Must provide an integer on the interval [-(2^63), 2^63-1]. Value: `%s`.', value ) );
}
v = BigInt.asUintN( 64, value ); // Convert to unsigned to make it fixed-width
buffer[ indices.HIGH ] = Number( v >> BigInt( 32 ) );
buffer[ indices.LOW ] = Number( v & BigInt( UINT32_MAX ) );
} else if ( isInteger( value ) && isBetween( value, MIN_SAFE_INTEGER, MAX_SAFE_INTEGER ) ) {
buffer[ indices.LOW ] = value >>> 0; // Truncate to 32-bit unsigned integer
if ( value >= 0 ) {
buffer[ indices.HIGH ] = ( value / TWO_32 ) >>> 0;
} else {
buffer[ indices.HIGH ] = ( ~( ( -value ) / TWO_32 ) + !buffer[ indices.LOW ] ) >>> 0; // 2's complement with carry from low word
}
} else {
throw new TypeError( format( 'invalid argument. Must provide an integer on the interval [-(2^53-1), 2^53-1]. Value: `%s`.', value ) );
}
setReadOnly( this, '_buffer', buffer );
return this;
}
/**
* Constructor name.
*
* @name name
* @memberof Int64
* @readonly
* @type {string}
* @default 'Int64'
*
* @example
* var name = Int64.name;
* // returns 'Int64'
*/
setReadOnly( Int64, 'name', 'Int64' );
/**
* Creates a new 64-bit signed integer from an array-like object containing a high and low word.
*
* @name from
* @memberof Int64
* @type {Function}
* @param {Collection} words - high and low words as 32-bit unsigned integers
* @throws {TypeError} must provide an array-like object containing two elements
* @returns {Int64} 64-bit signed integer
*
* @example
* var x = Int64.from( [ 1234, 5678 ] );
* // returns <Int64>
*/
setReadOnly( Int64, 'from', function fromWords( words ) {
var v;
if ( !isCollection( words ) ) {
throw new TypeError( format( 'invalid argument. Must provide an array. Value: `%s`.', words ) );
}
if ( words.length !== 2 ) {
throw new TypeError( format( 'invalid argument. Must provide an array of length 2. Value: `[%s]`.', join( words, ',' ) ) );
}
v = new Int64( 0 );
if ( isUint32Array( words ) ) {
v._buffer[ indices.HIGH ] = words[ 0 ]; // eslint-disable-line no-underscore-dangle
v._buffer[ indices.LOW ] = words[ 1 ]; // eslint-disable-line no-underscore-dangle
return v;
}
// TODO: consider supporting any iterable object
if (
isInteger( words[ 0 ] ) &&
isInteger( words[ 1 ] ) &&
isBetween( words[ 0 ], 0, UINT32_MAX ) &&
isBetween( words[ 1 ], 0, UINT32_MAX )
) {
// TODO: consider whether we should support accessor arrays here
v._buffer[ indices.HIGH ] = words[ 0 ]; // eslint-disable-line no-underscore-dangle
v._buffer[ indices.LOW ] = words[ 1 ]; // eslint-disable-line no-underscore-dangle
return v;
}
throw new TypeError( format( 'invalid argument. Must provide an array of integer values on the interval [%u, %u]. Value: `[%s]`.', 0, UINT32_MAX, join( words, ', ' ) ) );
});
/**
* Creates a new 64-bit signed integer from a high and low word.
*
* @name of
* @memberof Int64
* @type {Function}
* @param {uinteger} high - high word (32-bit unsigned integer)
* @param {uinteger} low - low word (32-bit unsigned integer)
* @throws {TypeError} first argument must be a nonnegative integer
* @throws {TypeError} second argument must be a nonnegative integer
* @returns {Int64} 64-bit signed integer
*
* @example
* var x = Int64.of( 1234, 5678 );
* // returns <Int64>
*/
setReadOnly( Int64, 'of', function of( high, low ) {
var v;
if ( !isInteger( high ) || !isBetween( high, 0, UINT32_MAX ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a nonnegative integer on the interval [%u, %u]. Value: `%s`.', 0, UINT32_MAX, high ) );
}
if ( !isInteger( low ) || !isBetween( low, 0, UINT32_MAX ) ) {
throw new TypeError( format( 'invalid argument. Second argument must be a nonnegative integer on the interval [%u, %u]. Value: `%s`.', 0, UINT32_MAX, low ) );
}
v = new Int64( 0 );
v._buffer[ indices.HIGH ] = high; // eslint-disable-line no-underscore-dangle
v._buffer[ indices.LOW ] = low; // eslint-disable-line no-underscore-dangle
return v;
});
/**
* Size (in bytes) of the underlying value.
*
* @name BYTES_PER_ELEMENT
* @memberof Int64
* @type {integer}
* @returns {integer} size in bytes
*
* @example
* var nbytes = Int64.BYTES_PER_ELEMENT;
* // returns 8
*/
setReadOnly( Int64, 'BYTES_PER_ELEMENT', 8 );
/**
* Size (in bytes) of the underlying value.
*
* @name BYTES_PER_ELEMENT
* @memberof Int64.prototype
* @type {integer}
* @returns {integer} size in bytes
*
* @example
* var x = new Int64( 5 );
*
* var nbytes = x.BYTES_PER_ELEMENT;
* // returns 8
*/
setReadOnly( Int64.prototype, 'BYTES_PER_ELEMENT', 8 );
/**
* Size (in bytes) of the underlying value.
*
* @name byteLength
* @memberof Int64.prototype
* @type {integer}
* @returns {integer} size in bytes
*
* @example
* var x = new Int64( 5 );
*
* var nbytes = x.byteLength;
* // returns 8
*/
setReadOnly( Int64.prototype, 'byteLength', 8 );
/**
* Returns the high 32-bit word of a 64-bit signed integer.
*
* @name hi
* @memberof Int64.prototype
* @type {uinteger}
* @returns {uinteger} high word (32-bit unsigned integer)
*
* @example
* var x = Int64.from( [ 1234, 5678 ] );
*
* var w = x.hi;
* // returns 1234
*/
setReadOnlyAccessor( Int64.prototype, 'hi', function getHighWord() {
return this._buffer[ indices.HIGH ];
});
/**
* Returns the low 32-bit word of a 64-bit signed integer.
*
* @name lo
* @memberof Int64.prototype
* @type {uinteger}
* @returns {uinteger} low word (32-bit unsigned integer)
*
* @example
* var x = Int64.from( [ 1234, 5678 ] );
*
* var w = x.lo;
* // returns 5678
*/
setReadOnlyAccessor( Int64.prototype, 'lo', function getLowWord() {
return this._buffer[ indices.LOW ];
});
/**
* Serializes a 64-bit signed integer as a string.
*
* @name toString
* @memberof Int64.prototype
* @type {Function}
* @param {PositiveInteger} [radix=10] - radix (base) to use for string conversion (2-36)
* @throws {TypeError} must provide an integer on the interval [2,36]
* @returns {string} serialized 64-bit signed integer
*
* @example
* var str = new Int64( 5 ).toString();
* // returns '5'
*
* str = Int64.from( [ 1, 0 ] ).toString();
* // returns '4294967296'
*
* str = new Int64( 100000000001 ).toString();
* // returns '100000000001'
*
*/
setReadOnly( Int64.prototype, 'toString', function toString( radix ) {
var sign;
var rad;
var hi;
var lo;
if ( arguments.length < 1 ) {
rad = 10;
} else if ( isInteger( radix ) && isBetween( radix, 2, 36 ) ) {
rad = radix;
} else {
throw new TypeError( format( 'invalid argument. Must provide an integer on the interval [%d, %d]. Value: `%s`.', 2, 36, radix ) );
}
if ( HAS_BIGINT ) {
return BigInt( this.valueOf() ).toString( rad );
}
sign = '';
hi = this.hi;
lo = this.lo;
if ( hi >>> 31 ) {
sign = '-';
lo = ( ~lo + 1 ) >>> 0;
hi = ( ~hi + !lo ) >>> 0;
}
// TODO: Refactor to use `uint64/base/words2string` later
return sign + int2str( [ hi, lo ], rad );
});
/**
* Serializes a 64-bit signed integer as a JSON object.
*
* ## Notes
*
* - `JSON.stringify()` implicitly calls this method when stringifying a `Int64` instance.
*
* @name toJSON
* @memberof Int64.prototype
* @type {Function}
* @returns {Object} serialized 64-bit signed integer
*
* @example
* var x = new Int64( 5 );
*
* var y = x.toJSON();
* // returns { 'type': 'Int64', 'words': [ 0, 5 ] }
*/
setReadOnly( Int64.prototype, 'toJSON', function toJSON() {
return {
'type': 'Int64',
'words': [ this.hi, this.lo ]
};
});
/**
* Converts a 64-bit signed integer to a primitive value.
*
* @name valueOf
* @memberof Int64.prototype
* @type {Function}
* @returns {(number|bigint)} primitive value
*
* @example
* var x = new Int64( 5 );
*
* var v = x.valueOf();
* // e.g., returns <bigint>
*/
setReadOnly( Int64.prototype, 'valueOf', function valueOf() {
var sign;
var hi;
var lo;
if ( HAS_BIGINT ) {
return BigInt.asIntN( 64, ( BigInt( this.hi ) << BigInt( 32 ) ) | BigInt( this.lo ) );
}
sign = 1;
hi = this.hi;
lo = this.lo;
if ( hi >>> 31 ) {
sign = -1;
lo = ( ~lo + 1 ) >>> 0;
hi = ( ~hi + !lo ) >>> 0;
}
return sign * ( ( hi * TWO_32 ) + lo );
});
/**
* Returns the primitive value of a 64-bit signed integer.
*
* @name toPrimitive
* @memberof Int64.prototype
* @type {Function}
* @param {string} hint - conversion hint
* @returns {(string|number|bigint)} primitive value
*
* @example
* var hasSymbol = require( '@stdlib/assert/has-to-primitive-symbol-support' );
* var ToPrimitiveSymbol = require( '@stdlib/symbol/to-primitive' );
*
* var x = new Int64( 5 );
*
* var v;
* if ( hasSymbol() ) {
* v = x[ ToPrimitiveSymbol ]( 'number' );
* // returns 5
*
* v = x[ ToPrimitiveSymbol ]( 'string' );
* // returns '5'
*
* v = x[ ToPrimitiveSymbol ]();
* // e.g., returns <bigint>
* }
*/
if ( hasToPrimitiveSymbolSupport() ) {
setReadOnly( Int64.prototype, ToPrimitiveSymbol, function toPrimitive( hint ) {
var sign;
var hi;
var lo;
if ( hint === 'number' ) {
sign = 1;
hi = this.hi;
lo = this.lo;
if ( hi >>> 31 ) {
sign = -1;
lo = ( ~lo + 1 ) >>> 0;
hi = ( ~hi + !lo ) >>> 0;
}
return sign * ( ( hi * TWO_32 ) + lo );
}
if ( hint === 'string' ) {
return this.toString();
}
return this.valueOf();
});
}
// EXPORTS //
module.exports = Int64;
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