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42 lines
1.7 KiB
42 lines
1.7 KiB
4 weeks ago
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'use strict';
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var $ = require('../internals/export');
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var uncurryThis = require('../internals/function-uncurry-this');
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
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var INVALID_NUMBER_REPRESENTATION = 'Invalid number representation';
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var INVALID_RADIX = 'Invalid radix';
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var $RangeError = RangeError;
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var $SyntaxError = SyntaxError;
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var $TypeError = TypeError;
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var $parseInt = parseInt;
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var pow = Math.pow;
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var valid = /^[\d.a-z]+$/;
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var charAt = uncurryThis(''.charAt);
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var exec = uncurryThis(valid.exec);
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var numberToString = uncurryThis(1.0.toString);
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var stringSlice = uncurryThis(''.slice);
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var split = uncurryThis(''.split);
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// `Number.fromString` method
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// https://github.com/tc39/proposal-number-fromstring
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$({ target: 'Number', stat: true, forced: true }, {
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fromString: function fromString(string, radix) {
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var sign = 1;
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if (typeof string != 'string') throw new $TypeError(INVALID_NUMBER_REPRESENTATION);
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if (!string.length) throw new $SyntaxError(INVALID_NUMBER_REPRESENTATION);
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if (charAt(string, 0) === '-') {
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sign = -1;
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string = stringSlice(string, 1);
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if (!string.length) throw new $SyntaxError(INVALID_NUMBER_REPRESENTATION);
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}
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var R = radix === undefined ? 10 : toIntegerOrInfinity(radix);
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if (R < 2 || R > 36) throw new $RangeError(INVALID_RADIX);
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if (!exec(valid, string)) throw new $SyntaxError(INVALID_NUMBER_REPRESENTATION);
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var parts = split(string, '.');
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var mathNum = $parseInt(parts[0], R);
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if (parts.length > 1) mathNum += $parseInt(parts[1], R) / pow(R, parts[1].length);
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if (R === 10 && numberToString(mathNum, R) !== string) throw new $SyntaxError(INVALID_NUMBER_REPRESENTATION);
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return sign * mathNum;
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}
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});
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