source: imaps-frontend/node_modules/es-abstract/2017/ToNumber.js

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $TypeError = require('es-errors/type');
var $Number = GetIntrinsic('%Number%');
var $RegExp = GetIntrinsic('%RegExp%');
var $parseInteger = GetIntrinsic('%parseInt%');

var callBound = require('call-bind/callBound');
var regexTester = require('safe-regex-test');
var isPrimitive = require('../helpers/isPrimitive');

var $strSlice = callBound('String.prototype.slice');
var isBinary = regexTester(/^0b[01]+$/i);
var isOctal = regexTester(/^0o[0-7]+$/i);
var isInvalidHexLiteral = regexTester(/^[-+]0x[0-9a-f]+$/i);
var nonWS = ['\u0085', '\u200b', '\ufffe'].join('');
var nonWSregex = new $RegExp('[' + nonWS + ']', 'g');
var hasNonWS = regexTester(nonWSregex);

var $trim = require('string.prototype.trim');

var ToPrimitive = require('./ToPrimitive');

// https://262.ecma-international.org/6.0/#sec-tonumber

module.exports = function ToNumber(argument) {
        var value = isPrimitive(argument) ? argument : ToPrimitive(argument, $Number);
        if (typeof value === 'symbol') {
                throw new $TypeError('Cannot convert a Symbol value to a number');
        }
        if (typeof value === 'string') {
                if (isBinary(value)) {
                        return ToNumber($parseInteger($strSlice(value, 2), 2));
                } else if (isOctal(value)) {
                        return ToNumber($parseInteger($strSlice(value, 2), 8));
                } else if (hasNonWS(value) || isInvalidHexLiteral(value)) {
                        return NaN;
                }
                var trimmed = $trim(value);
                if (trimmed !== value) {
                        return ToNumber(trimmed);
                }

        }
        return $Number(value);
};