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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 */
'use strict';
// MODULES //
var BigInt = require( '@stdlib/bigint/ctor' );
var Number = require( '@stdlib/number/ctor' );
var UINT32_MAX = require( '@stdlib/constants/uint32/max' );
var Uint32Array = require( '@stdlib/array/uint32' );
var format = require( '@stdlib/string/format' );
var hasBigIntSupport = require( '@stdlib/assert/has-bigint-support' );
var isArray = require( '@stdlib/assert/is-array' );
var isBigInt = require( '@stdlib/assert/is-bigint' );
var isInteger = require( '@stdlib/assert/is-integer' ).isPrimitive;
var isNan = require( '@stdlib/assert/is-nan' );
var isNumber = require( '@stdlib/assert/is-number' ).isPrimitive;
var isString = require( '@stdlib/assert/is-string' );
var isUint32Array = require( '@stdlib/assert/is-uint32array' );
var setReadOnly = require( '@stdlib/utils/define-nonenumerable-read-only-property' );
var asBigUint64 = require( './asbiguint64.js' );
var getHighWord = require( './gethighword.js' );
var getLowWord = require( './getlowword.js' );
var parseUint64dw = require( './parseuint64dw.js' );
var toBigInt = require( './tobigint.js' );
var toJSON = require( './tojson.js' );
var toString = require( './tostring.js' ); // eslint-disable-line stdlib/no-redeclare
var valueOf = require( './valueof.js' ); // eslint-disable-line stdlib/no-redeclare
// VARIABLES //
var TWO_32 = 0x100000000;
var hasBigInt = hasBigIntSupport();
// MAIN //
/**
* Unsigned 64-bit integer constructor.
*
* @constructor
* @param {number|string|Array<number>|Uint32Array|BigInt} value - numeric value or high low words or BigInt
* @throws {TypeError}
* @returns {Uint64} Unsigned 64-bit integer
*
* @example // TODO: add more example
* var x = new Uint64( 5 );
* // returns <Uint64>
*/
function Uint64( value ) {
var raw;
var tmp;
if ( !( this instanceof Uint64 ) ) {
throw new TypeError( 'invalid invocation. Constructor must be called with the `new` keyword.' );
}
if ( isBigInt( value ) ) {
raw = asBigUint64( value );
}
else if ( isUint32Array( value ) ) {
if ( value.length === 2 ) {
if ( hasBigInt ) {
raw = ( BigInt( value[ 0 ] ) << BigInt( 32 ) ) | BigInt( value[ 1 ] );
}
else {
raw = value; // TODO: should we copy it instead?
}
}
else {
throw new TypeError( format( 'invalid argument. Provided Uint32Array must have a length of 2. Value: `%s`.', value ) );
}
}
else if ( isArray( value ) ) {
if ( value.length === 2 ) {
if ( isInteger( value[ 0 ] ) && isInteger( value[ 1 ] ) && value[ 0 ] >= 0 && value[ 0 ] <= UINT32_MAX && value[ 1 ] >= 0 && value[ 1 ] <= UINT32_MAX ) {
if ( hasBigInt ) {
raw = ( BigInt( value[ 0 ] ) << BigInt( 32 ) ) | BigInt( value[ 1 ] );
}
else {
raw = new Uint32Array( value );
}
}
else {
throw new TypeError( format( 'invalid argument. Provided array must contain only integer values between 0 and %s. Value: `%s`.', UINT32_MAX, value ) );
}
}
else {
throw new TypeError( format( 'invalid argument. Provided array must have a length of 2. Value: `%s`.', value ) );
}
}
else if ( isString( value ) ) {
if ( value[ 0 ] === '-' ) {
throw new TypeError( format( 'invalid argument. Provided value must be non-negative. Value: `%s`.', value ) );
}
if ( hasBigInt ) {
try {
raw = asBigUint64( BigInt( value ) );
}
catch ( error ) { // eslint-disable-line no-unused-vars
throw new TypeError( format( 'invalid argument. Could not convert string to Uint64. Value: `%s`.', value ) );
}
}
else {
if ( value[ 0 ] === '+' ) {
tmp = value.slice( 1 );
}
else {
tmp = value;
}
tmp = parseUint64dw( tmp );
if ( !isNaN( tmp[ 0 ] ) && !isNan( tmp[ 1 ] ) ) {
raw = new Uint32Array( tmp );
}
else {
throw new TypeError( format( 'invalid argument. Could not convert string to Uint64. Value: `%s`.', value ) );
}
}
}
else if ( isNumber( value ) ) {
if ( value >= 0 && Number.isSafeInteger( value ) ) {
if ( hasBigInt ) {
raw = asBigUint64( BigInt( value ) );
}
else {
raw = new Uint32Array( 2 );
raw[ 0 ] = ( value / TWO_32 ) >>> 0;
raw[ 1 ] = value >>> 0;
}
}
else {
throw new TypeError( format( 'invalid argument. Provided number must be between 0 and %s. Value: `%s`.', Number.MAX_SAFE_INTEGER, value ) );
}
}
else {
throw new TypeError( format( 'invalid argument. Must provide a number or string or Array<number> or Uint32Array or BigInt. Value: `%s`.', value ) );
}
setReadOnly( this, '_raw', raw );
return this;
}
/**
* Constructor name.
*
* @name name
* @memberof Uint64
* @readonly
* @type {string}
* @default 'Uint64'
*
* @example
* var name = Uint64.name;
* // returns 'Uint64'
*/
setReadOnly( Uint64, 'name', 'Uint64' );
/**
* Size (in bytes) of the underlying value.
*
* @name BYTES_PER_ELEMENT
* @memberof Uint64
* @type {integer}
* @returns {integer} size in bytes
*
* @example
* var nbytes = Uint64.BYTES_PER_ELEMENT;
* // returns 8
*/
setReadOnly( Uint64, 'BYTES_PER_ELEMENT', 8 );
/**
* Size (in bytes) of the underlying value.
*
* @name BYTES_PER_ELEMENT
* @memberof Uint64.prototype
* @type {integer}
* @returns {integer} size in bytes
*
* @example
* var x = new Uint64( 5 );
*
* var nbytes = x.BYTES_PER_ELEMENT;
* // returns 8
*/
setReadOnly( Uint64.prototype, 'BYTES_PER_ELEMENT', 8 );
/**
* Serializes an unsigned 64-bit integer number as a string.
*
* @name toString
* @memberof Uint64.prototype
* @type {Function}
* @returns {string} serialized unsigned 64-bit integer number
*
* @example
* var str = new Uint64( 5 ).toString();
* // returns '5'
*
* str = new Uint64( [ 1, 0 ] ).toString();
* // returns '4294967296'
*
* str = new Uint64( 100000000001 ).toString();
* // returns '100000000001'
*
*/
setReadOnly( Uint64.prototype, 'toString', toString );
/**
* Serializes an unsigned 64-bit integer number as a JSON object.
*
* ## Notes
*
* - `JSON.stringify()` implicitly calls this method when stringifying a `Uint64` instance.
*
* @name toJSON
* @memberof Uint64.prototype
* @type {Function}
* @returns {Object} serialized unsigned 64-bit integer number
*
* @example
* var x = new Uint64( 5 );
*
* var y = x.toJSON();
* // returns { 'type': 'Uint64', 'high': 0, 'low': 5 }
*/
setReadOnly( Uint64.prototype, 'toJSON', toJSON );
/**
* Converts an unsigned 64-bit integer number to a primitive value.
*
* @name valueOf
* @memberof Uint64.prototype
* @type {Function}
* @returns {number} primitive value
*
* @example
* var x = new Uint64( 5 );
*
* var v = x.valueOf();
* // returns 5.0
*/
setReadOnly( Uint64.prototype, 'valueOf', valueOf );
/**
* Returns the high 32-bit word of an unsigned 64-bit integer number.
*
* @name getHighWord
* @memberof Uint64.prototype
* @type {Function}
* @returns {number} 32-bit unsigned integer
*
* @example
*
* var x = new Uint64( [ 1234, 5678 ] );
*
* var y = x.getHighWord();
* // returns 1234.0
*/
setReadOnly( Uint64.prototype, 'getHighWord', getHighWord );
/**
* Returns the low 32-bit word of an unsigned 64-bit integer number.
*
* @name getLowWord
* @memberof Uint64.prototype
* @type {Function}
* @returns {number} 32-bit unsigned integer
*
* @example
*
* var x = new Uint64( [ 1234, 5678 ] );
*
* var y = x.getLowWord();
* // returns 5678.0
*/
setReadOnly( Uint64.prototype, 'getLowWord', getLowWord );
/**
* Converts an unsigned 64-bit integer number to a BigInt.
*
* @name toBigInt
* @memberof Uint64.prototype
* @type {Function}
* @returns {BigInt} BigInt value
*
* @example
* var hasBigInt = require( '@stdlib/assert/has-bigint-support' );
*
* var x = new Uint64( 5 );
*
* var v;
* if ( hasBigInt() ) {
* v = x.toBigInt();
* // returns 5.0
* }
*/
if ( hasBigInt ) {
setReadOnly( Uint64.prototype, 'toBigInt', toBigInt );
}
// EXPORTS //
module.exports = Uint64;
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