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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 isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var Uint64 = require( '@stdlib/number/uint64/ctor' );
var trim = require( '@stdlib/string/base/trim' );
var slice = require( '@stdlib/string/base/slice' );
var format = require( '@stdlib/string/format' );
var parse = require( './parse.js' );
 
 
// MAIN //
 
/**
* Parses a string as an unsigned 64-bit integer.
*
* @param {string} str - string representation of a nonnegative integer
* @throws {TypeError} must provide a string encoding a nonnegative integer
* @returns {Uint64} unsigned 64-bit integer
*
* @example
* var v = fromString( '5' );
* // returns <Uint64>
*/
function fromString( str ) {
	var v;
	if ( !isString( str ) ) {
		throw new TypeError( format( 'invalid argument. Must provide a string. Value: `%s`.', str ) );
	}
	v = trim( str );
	if ( v[ 0 ] === '-' ) {
		throw new TypeError( format( 'invalid argument. Must provide a string encoding a nonnegative integer. Value: `%s`.', str ) );
	}
	if ( v[ 0 ] === '+' ) {
		v = slice( v, 1 );
	}
	v = parse( v );
	if ( v[ 0 ] === -1 ) {
		throw new TypeError( format( 'invalid argument. Must provide a string encoding a nonnegative integer. Value: `%s`.', str ) );
	}
	return Uint64.from( v );
}
 
 
// EXPORTS //
 
module.exports = fromString;