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Suffix for integral values

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This commit is contained in:
millb 2019-12-06 21:59:48 +03:00
parent 3d279499d0
commit 16ce798345
1 changed files with 83 additions and 1 deletions
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84
dbms/src/IO/ReadHelpers.h
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@ -877,6 +877,88 @@ inline T parse(const char * data, size_t size)
return res;
}
template <typename T>
inline std::enable_if_t<is_integral_v<T>, void>
readTextWithSuffix(T & x, ReadBuffer & buf)
{
readIntText(x, buf);
if (buf.eof())
return;
switch (*buf.position())
{
case 'k':
{
++buf.position();
if (buf.eof())
{
x *= 1000;
}
else if (*buf.position() == 'i')
{
x = (x << 10);
++buf.position();
}
else
{
assertEOF(buf);
}
}
case 'M':
{
++buf.position();
if (buf.eof())
{
x *= 1000000;
}
else if (*buf.position() == 'i')
{
x = (x << 20);
++buf.position();
}
else
{
assertEOF(buf);
}
}
case 'G':
{
if (buf.eof())
{
x *= 1000000000;
}
else if (*buf.position() == 'i')
{
x = (x << 30);
++buf.position();
}
else
{
assertEOF(buf);
}
}
case 'T':
{
if (buf.eof())
{
x *= 1000000000000;
}
else if (*buf.position() == 'i')
{
x = (x << 40);
++buf.position();
}
else
{
assertEOF(buf);
}
}
}
return;
}
template <typename T>
inline void readTextWithSuffix(T & x, ReadBuffer & buf) { readText(x, buf); }
/// Read something from text format, but expect complete parse of given text
/// For example: 723145 -- ok, 213MB -- not ok
template <typename T>
@ -884,7 +966,7 @@ inline T completeParse(const char * data, size_t size)
{
T res;
ReadBufferFromMemory buf(data, size);
readText(res, buf);
readTextWithSuffix(res, buf);
assertEOF(buf);
return res;
}