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dbms: refactor DoubleConverter [#METR-17328]

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This commit is contained in:
Andrey Mironov 2015-11-30 18:15:45 +03:00
parent 1ca3d930da
commit 386d560d39
5 changed files with 44 additions and 29 deletions
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29
dbms/include/DB/IO/DoubleConverter.h
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@ -2,6 +2,7 @@
#include <double-conversion/double-conversion.h>
namespace DB
{
@ -15,14 +16,28 @@ template <> struct DoubleToStringConverterFlags<true>
static constexpr auto flags = double_conversion::DoubleToStringConverter::EMIT_TRAILING_DECIMAL_POINT;
};
template <bool emit_decimal_point = true>
const double_conversion::DoubleToStringConverter & getDoubleToStringConverter()
template <bool emit_decimal_point>
class DoubleConverter
{
static const double_conversion::DoubleToStringConverter instance{
DoubleToStringConverterFlags<emit_decimal_point>::flags, "inf", "nan", 'e', -6, 21, 6, 1
};
DoubleConverter(const DoubleConverter &) = delete;
DoubleConverter & operator=(const DoubleConverter &) = delete;
return instance;
}
DoubleConverter() = default;
public:
/** @todo Add commentary on how this constant is deduced.
* e.g. it's minus sign, integral zero, decimal point, up to 5 leading zeros and kBase10MaximalLength digits. */
static constexpr auto MAX_REPRESENTATION_LENGTH = 26;
using BufferType = char[MAX_REPRESENTATION_LENGTH];
static const auto & instance()
{
static const double_conversion::DoubleToStringConverter instance{
DoubleToStringConverterFlags<emit_decimal_point>::flags, "inf", "nan", 'e', -6, 21, 6, 1
};
return instance;
}
};
}

16
dbms/include/DB/IO/WriteHelpers.h
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@ -87,28 +87,28 @@ inline void writeBoolText(bool x, WriteBuffer & buf)
inline void writeFloatText(double x, WriteBuffer & buf)
{
char tmp[25];
double_conversion::StringBuilder builder{tmp, sizeof(tmp)};
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = getDoubleToStringConverter<false>().ToShortest(x, &builder);
const auto result = DoubleConverter<false>::instance().ToShortest(x, &builder);
if (!result)
throw Exception("Cannot print double number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
buf.write(tmp, builder.position());
buf.write(buffer, builder.position());
}
inline void writeFloatText(float x, WriteBuffer & buf)
{
char tmp[25];
double_conversion::StringBuilder builder{tmp, sizeof(tmp)};
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = getDoubleToStringConverter<false>().ToShortestSingle(x, &builder);
const auto result = DoubleConverter<false>::instance().ToShortestSingle(x, &builder);
if (!result)
throw Exception("Cannot print float number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
buf.write(tmp, builder.position());
buf.write(buffer, builder.position());
}

8
dbms/src/Common/formatReadable.cpp
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@ -14,15 +14,15 @@ static void formatReadable(double size, DB::WriteBuffer & out, int precision, co
for (; i + 1 < units_size && fabs(size) >= delimiter; ++i)
size /= delimiter;
char tmp[25];
double_conversion::StringBuilder builder{tmp, sizeof(tmp)};
DB::DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = DB::getDoubleToStringConverter<false>().ToFixed(size, precision, &builder);
const auto result = DB::DoubleConverter<false>::instance().ToFixed(size, precision, &builder);
if (!result)
throw DB::Exception("Cannot print float or double number", DB::ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
out.write(tmp, builder.position());
out.write(buffer, builder.position());
writeCString(units[i], out);
}

8
dbms/src/Core/FieldVisitors.cpp
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@ -34,15 +34,15 @@ String FieldVisitorDump::operator() (const Array & x) const
String FieldVisitorToString::formatFloat(const Float64 x)
{
char tmp[25];
double_conversion::StringBuilder builder{tmp, sizeof(tmp)};
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = getDoubleToStringConverter().ToShortest(x, &builder);
const auto result = DoubleConverter<false>::instance().ToShortest(x, &builder);
if (!result)
throw Exception("Cannot print float or double number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
return { tmp, tmp + builder.position() };
return { buffer, buffer + builder.position() };
}
String FieldVisitorToString::operator() (const Array & x) const

12
dbms/src/Functions/FunctionsMiscellaneous.cpp
View File

@ -35,10 +35,10 @@ static void numWidthConstant(T a, UInt64 & c)
inline UInt64 floatWidth(const double x)
{
char tmp[25];
double_conversion::StringBuilder builder{tmp, sizeof(tmp)};
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = getDoubleToStringConverter<false>().ToShortest(x, &builder);
const auto result = DoubleConverter<false>::instance().ToShortest(x, &builder);
if (!result)
throw Exception("Cannot print double number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
@ -48,10 +48,10 @@ inline UInt64 floatWidth(const double x)
inline UInt64 floatWidth(const float x)
{
char tmp[25];
double_conversion::StringBuilder builder{tmp, sizeof(tmp)};
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
const auto result = getDoubleToStringConverter<false>().ToShortestSingle(x, &builder);
const auto result = DoubleConverter<false>::instance().ToShortestSingle(x, &builder);
if (!result)
throw Exception("Cannot print float number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);