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175 lines
3.9 KiB
C++
175 lines
3.9 KiB
C++
#ifndef DBMS_COMMON_WRITEHELPERS_H
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#define DBMS_COMMON_WRITEHELPERS_H
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#include <cstring>
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#include <cstdio>
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#include <limits>
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#include <algorithm>
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#include <Yandex/DateLUT.h>
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#include <DB/Core/Types.h>
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#include <DB/Core/Exception.h>
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#include <DB/Core/ErrorCodes.h>
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#include <DB/IO/WriteBuffer.h>
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#define WRITE_HELPERS_DEFAULT_FLOAT_PRECISION 6U
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/// 20 цифр и знак
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#define WRITE_HELPERS_MAX_INT_WIDTH 21U
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namespace DB
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{
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/// Функции-помошники для форматированной записи
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inline void writeChar(char x, WriteBuffer & buf)
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{
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buf.nextIfAtEnd();
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*buf.position() = x;
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++buf.position();
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}
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/// Запись числа в native формате
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template <typename T>
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inline void writeIntBinary(T & x, WriteBuffer & buf)
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{
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buf.write(reinterpret_cast<const char *>(&x), sizeof(x));
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}
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template <typename T>
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void writeIntText(T x, WriteBuffer & buf)
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{
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char tmp[WRITE_HELPERS_MAX_INT_WIDTH];
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bool negative = false;
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if (x == 0)
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{
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writeChar('0', buf);
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return;
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}
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if (x < 0)
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{
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x = -x;
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negative = true;
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}
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char * pos;
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for (pos = tmp + WRITE_HELPERS_MAX_INT_WIDTH - 1; x != 0; --pos)
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{
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*pos = '0' + x % 10;
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x /= 10;
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}
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if (negative)
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*pos = '-';
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else
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++pos;
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buf.write(pos, tmp + WRITE_HELPERS_MAX_INT_WIDTH - pos);
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}
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template <typename T>
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void writeFloatText(T x, WriteBuffer & buf, unsigned precision = WRITE_HELPERS_DEFAULT_FLOAT_PRECISION)
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{
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unsigned size = precision + 10;
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char tmp[size]; /// знаки, +0.0e+123\0
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int res = std::snprintf(tmp, size, "%.*g", precision, x);
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if (res >= static_cast<int>(size) || res <= 0)
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throw Exception("Cannot print float or double number", ErrorCodes::CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER);
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buf.write(tmp, res);
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}
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inline void writeString(const String & s, WriteBuffer & buf)
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{
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buf.write(s.data(), s.size());
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}
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/// предполагается, что строка в оперативке хранится непрерывно, и \0-terminated.
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void writeEscapedString(const String & s, WriteBuffer & buf);
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inline void writeQuotedString(const String & s, WriteBuffer & buf)
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{
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writeChar('\'', buf);
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writeEscapedString(s, buf);
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writeChar('\'', buf);
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}
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/// Совместимо с JSON.
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void writeDoubleQuotedString(const String & s, WriteBuffer & buf);
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/// в формате YYYY-MM-DD
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inline void writeDateText(Yandex::DayNum_t date, WriteBuffer & buf)
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{
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char s[10] = {'0', '0', '0', '0', '-', '0', '0', '-', '0', '0'};
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if (unlikely(date > DATE_LUT_MAX_DAY_NUM || date == 0))
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{
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buf.write(s, 10);
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return;
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}
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const Yandex::DateLUT::Values & values = Yandex::DateLUTSingleton::instance().getValues(date);
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s[0] += values.year / 1000;
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s[1] += (values.year / 100) % 10;
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s[2] += (values.year / 10) % 10;
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s[3] += values.year % 10;
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s[5] += values.month / 10;
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s[6] += values.month % 10;
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s[8] += values.day_of_month / 10;
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s[9] += values.day_of_month % 10;
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buf.write(s, 10);
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}
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/// в формате YYYY-MM-DD HH:MM:SS, согласно текущему часовому поясу
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inline void writeDateTimeText(time_t datetime, WriteBuffer & buf)
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{
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char s[19] = {'0', '0', '0', '0', '-', '0', '0', '-', '0', '0', ' ', '0', '0', ':', '0', '0', ':', '0', '0'};
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if (unlikely(datetime > DATE_LUT_MAX || datetime == 0))
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{
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buf.write(s, 19);
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return;
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}
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Yandex::DateLUTSingleton & date_lut = Yandex::DateLUTSingleton::instance();
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const Yandex::DateLUT::Values & values = date_lut.getValues(datetime);
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s[0] += values.year / 1000;
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s[1] += (values.year / 100) % 10;
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s[2] += (values.year / 10) % 10;
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s[3] += values.year % 10;
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s[5] += values.month / 10;
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s[6] += values.month % 10;
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s[8] += values.day_of_month / 10;
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s[9] += values.day_of_month % 10;
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UInt8 hour = date_lut.toHourInaccurate(datetime);
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UInt8 minute = date_lut.toMinute(datetime);
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UInt8 second = date_lut.toSecond(datetime);
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s[11] += hour / 10;
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s[12] += hour % 10;
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s[14] += minute / 10;
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s[15] += minute % 10;
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s[17] += second / 10;
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s[18] += second % 10;
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buf.write(s, 19);
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}
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}
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#endif
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