1 |
3a515b92
|
cagy
|
export default function parse(input) {
|
2 |
|
|
input = input.toUpperCase();
|
3 |
|
|
var splitIndex = input.indexOf("P");
|
4 |
|
|
var mantissa, exponent;
|
5 |
|
|
|
6 |
|
|
if (splitIndex !== -1) {
|
7 |
|
|
mantissa = input.substring(0, splitIndex);
|
8 |
|
|
exponent = parseInt(input.substring(splitIndex + 1));
|
9 |
|
|
} else {
|
10 |
|
|
mantissa = input;
|
11 |
|
|
exponent = 0;
|
12 |
|
|
}
|
13 |
|
|
|
14 |
|
|
var dotIndex = mantissa.indexOf(".");
|
15 |
|
|
|
16 |
|
|
if (dotIndex !== -1) {
|
17 |
|
|
var integerPart = parseInt(mantissa.substring(0, dotIndex), 16);
|
18 |
|
|
var sign = Math.sign(integerPart);
|
19 |
|
|
integerPart = sign * integerPart;
|
20 |
|
|
var fractionLength = mantissa.length - dotIndex - 1;
|
21 |
|
|
var fractionalPart = parseInt(mantissa.substring(dotIndex + 1), 16);
|
22 |
|
|
var fraction = fractionLength > 0 ? fractionalPart / Math.pow(16, fractionLength) : 0;
|
23 |
|
|
|
24 |
|
|
if (sign === 0) {
|
25 |
|
|
if (fraction === 0) {
|
26 |
|
|
mantissa = sign;
|
27 |
|
|
} else {
|
28 |
|
|
if (Object.is(sign, -0)) {
|
29 |
|
|
mantissa = -fraction;
|
30 |
|
|
} else {
|
31 |
|
|
mantissa = fraction;
|
32 |
|
|
}
|
33 |
|
|
}
|
34 |
|
|
} else {
|
35 |
|
|
mantissa = sign * (integerPart + fraction);
|
36 |
|
|
}
|
37 |
|
|
} else {
|
38 |
|
|
mantissa = parseInt(mantissa, 16);
|
39 |
|
|
}
|
40 |
|
|
|
41 |
|
|
return mantissa * (splitIndex !== -1 ? Math.pow(2, exponent) : 1);
|
42 |
|
|
}
|