mirror of https://github.com/jkjoy/sunpeiwen.git
49 lines
1.5 KiB
JavaScript
49 lines
1.5 KiB
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $Number = GetIntrinsic('%Number%');
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var $RegExp = GetIntrinsic('%RegExp%');
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var $parseInteger = GetIntrinsic('%parseInt%');
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var callBound = require('call-bind/callBound');
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var regexTester = require('safe-regex-test');
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var isPrimitive = require('../helpers/isPrimitive');
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var $strSlice = callBound('String.prototype.slice');
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var isBinary = regexTester(/^0b[01]+$/i);
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var isOctal = regexTester(/^0o[0-7]+$/i);
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var isInvalidHexLiteral = regexTester(/^[-+]0x[0-9a-f]+$/i);
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var nonWS = ['\u0085', '\u200b', '\ufffe'].join('');
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var nonWSregex = new $RegExp('[' + nonWS + ']', 'g');
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var hasNonWS = regexTester(nonWSregex);
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var $trim = require('string.prototype.trim');
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var ToPrimitive = require('./ToPrimitive');
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// https://262.ecma-international.org/6.0/#sec-tonumber
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module.exports = function ToNumber(argument) {
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var value = isPrimitive(argument) ? argument : ToPrimitive(argument, $Number);
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if (typeof value === 'symbol') {
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throw new $TypeError('Cannot convert a Symbol value to a number');
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}
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if (typeof value === 'string') {
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if (isBinary(value)) {
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return ToNumber($parseInteger($strSlice(value, 2), 2));
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} else if (isOctal(value)) {
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return ToNumber($parseInteger($strSlice(value, 2), 8));
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} else if (hasNonWS(value) || isInvalidHexLiteral(value)) {
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return NaN;
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}
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var trimmed = $trim(value);
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if (trimmed !== value) {
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return ToNumber(trimmed);
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}
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}
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return $Number(value);
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};
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