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60 lines
2.0 KiB
60 lines
2.0 KiB
1 year ago
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'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('../helpers/regexTester');
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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 $RegExp('[' + nonWS + ']', 'g');
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var hasNonWS = regexTester(nonWSregex);
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// whitespace from: https://es5.github.io/#x15.5.4.20
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// implementation from https://github.com/es-shims/es5-shim/blob/v3.4.0/es5-shim.js#L1304-L1324
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var ws = [
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'\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003',
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'\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028',
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'\u2029\uFEFF'
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].join('');
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var trimRegex = new RegExp('(^[' + ws + ']+)|([' + ws + ']+$)', 'g');
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var $replace = callBound('String.prototype.replace');
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var $trim = function (value) {
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return $replace(value, trimRegex, '');
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};
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var ToPrimitive = require('./ToPrimitive');
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// https://ecma-international.org/ecma-262/6.0/#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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