blob: 90923160c552ea69f2a596a03cd363becf812b2e (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
#include "parse_double.h"
#include <util/string/ascii.h>
#include <util/string/cast.h>
namespace NYql {
namespace {
template <typename T>
bool GenericTryFloatFromString(TStringBuf buf, T& value) {
value = 0;
if (!buf.size()) {
return false;
}
if (TryFromString(buf.data(), buf.size(), value)) {
return true;
}
const char* ptr = buf.data();
ui32 size = buf.size();
char sign = '+';
if (*ptr == '+' || *ptr == '-') {
sign = *ptr;
++ptr;
--size;
}
if (size != 3) {
return false;
}
// NaN or Inf (ignoring case)
if (AsciiToUpper(ptr[0]) == 'N' && AsciiToUpper(ptr[1]) == 'A' && AsciiToUpper(ptr[2]) == 'N') {
value = std::numeric_limits<T>::quiet_NaN();
} else if (AsciiToUpper(ptr[0]) == 'I' && AsciiToUpper(ptr[1]) == 'N' && AsciiToUpper(ptr[2]) == 'F') {
value = std::numeric_limits<T>::infinity();
} else {
return false;
}
if (sign == '-') {
value = -value;
}
return true;
}
}
float FloatFromString(TStringBuf buf) {
float result = 0;
if (!TryFloatFromString(buf, result)) {
throw yexception() << "unable to parse float from '" << buf << "'";
}
return result;
}
double DoubleFromString(TStringBuf buf) {
double result = 0;
if (!TryDoubleFromString(buf, result)) {
throw yexception() << "unable to parse double from '" << buf << "'";
}
return result;
}
bool TryFloatFromString(TStringBuf buf, float& value) {
return GenericTryFloatFromString(buf, value);
}
bool TryDoubleFromString(TStringBuf buf, double& value) {
return GenericTryFloatFromString(buf, value);
}
}
|
