hexo/node_modules/es-abstract/2015/ToNumber.js

'use strict';

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

var $TypeError = GetIntrinsic('%TypeError%');
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);
};