Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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100644
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File size:
1.1 KB
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1 | export default function parse(input) {
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2 | input = input.toUpperCase();
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3 | var splitIndex = input.indexOf("P");
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4 | var mantissa, exponent;
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5 |
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6 | if (splitIndex !== -1) {
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7 | mantissa = input.substring(0, splitIndex);
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8 | exponent = parseInt(input.substring(splitIndex + 1));
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9 | } else {
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10 | mantissa = input;
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11 | exponent = 0;
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12 | }
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13 |
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14 | var dotIndex = mantissa.indexOf(".");
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15 |
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16 | if (dotIndex !== -1) {
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17 | var integerPart = parseInt(mantissa.substring(0, dotIndex), 16);
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18 | var sign = Math.sign(integerPart);
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19 | integerPart = sign * integerPart;
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20 | var fractionLength = mantissa.length - dotIndex - 1;
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21 | var fractionalPart = parseInt(mantissa.substring(dotIndex + 1), 16);
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22 | var fraction = fractionLength > 0 ? fractionalPart / Math.pow(16, fractionLength) : 0;
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23 |
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24 | if (sign === 0) {
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25 | if (fraction === 0) {
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26 | mantissa = sign;
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27 | } else {
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28 | if (Object.is(sign, -0)) {
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29 | mantissa = -fraction;
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30 | } else {
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31 | mantissa = fraction;
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32 | }
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33 | }
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34 | } else {
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35 | mantissa = sign * (integerPart + fraction);
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36 | }
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37 | } else {
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38 | mantissa = parseInt(mantissa, 16);
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39 | }
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40 |
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41 | return mantissa * (splitIndex !== -1 ? Math.pow(2, exponent) : 1);
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42 | } |
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