57 строки
1.8 KiB
JavaScript
57 строки
1.8 KiB
JavaScript
'use strict';
|
|
|
|
var GetIntrinsic = require('get-intrinsic');
|
|
|
|
var $Number = GetIntrinsic('%Number%');
|
|
var $RegExp = GetIntrinsic('%RegExp%');
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
|
var $parseInteger = GetIntrinsic('%parseInt%');
|
|
|
|
var callBound = require('call-bind/callBound');
|
|
var regexTester = require('safe-regex-test');
|
|
|
|
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 $RegExp('[' + nonWS + ']', 'g');
|
|
var hasNonWS = regexTester(nonWSregex);
|
|
|
|
// whitespace from: https://es5.github.io/#x15.5.4.20
|
|
// implementation from https://github.com/es-shims/es5-shim/blob/v3.4.0/es5-shim.js#L1304-L1324
|
|
var ws = [
|
|
'\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003',
|
|
'\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028',
|
|
'\u2029\uFEFF'
|
|
].join('');
|
|
var trimRegex = new RegExp('(^[' + ws + ']+)|([' + ws + ']+$)', 'g');
|
|
var $replace = callBound('String.prototype.replace');
|
|
var $trim = function (value) {
|
|
return $replace(value, trimRegex, '');
|
|
};
|
|
|
|
var Type = require('./Type');
|
|
|
|
// https://ecma-international.org/ecma-262/13.0/#sec-stringtonumber
|
|
|
|
module.exports = function StringToNumber(argument) {
|
|
if (Type(argument) !== 'String') {
|
|
throw new $TypeError('Assertion failed: `argument` is not a String');
|
|
}
|
|
if (isBinary(argument)) {
|
|
return $Number($parseInteger($strSlice(argument, 2), 2));
|
|
}
|
|
if (isOctal(argument)) {
|
|
return $Number($parseInteger($strSlice(argument, 2), 8));
|
|
}
|
|
if (hasNonWS(argument) || isInvalidHexLiteral(argument)) {
|
|
return NaN;
|
|
}
|
|
var trimmed = $trim(argument);
|
|
if (trimmed !== argument) {
|
|
return StringToNumber(trimmed);
|
|
}
|
|
return $Number(argument);
|
|
};
|