mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-27 18:12:02 +00:00
679 lines
18 KiB
C++
679 lines
18 KiB
C++
#pragma once
|
||
|
||
#include <cstring>
|
||
#include <limits>
|
||
#include <algorithm>
|
||
|
||
#include <type_traits>
|
||
|
||
#include <common/Common.h>
|
||
#include <common/DateLUT.h>
|
||
|
||
#include <mysqlxx/Date.h>
|
||
#include <mysqlxx/DateTime.h>
|
||
|
||
#include <DB/Core/Types.h>
|
||
#include <DB/Core/Exception.h>
|
||
#include <DB/Core/ErrorCodes.h>
|
||
|
||
#include <DB/IO/ReadBuffer.h>
|
||
#include <DB/IO/VarInt.h>
|
||
#include <city.h>
|
||
|
||
#define DEFAULT_MAX_STRING_SIZE 0x00FFFFFFULL
|
||
|
||
|
||
namespace DB
|
||
{
|
||
|
||
/// Функции-помошники для форматированного чтения
|
||
|
||
static inline char parseEscapeSequence(char c)
|
||
{
|
||
switch(c)
|
||
{
|
||
case 'b':
|
||
return '\b';
|
||
case 'f':
|
||
return '\f';
|
||
case 'n':
|
||
return '\n';
|
||
case 'r':
|
||
return '\r';
|
||
case 't':
|
||
return '\t';
|
||
case '0':
|
||
return '\0';
|
||
default:
|
||
return c;
|
||
}
|
||
}
|
||
|
||
|
||
/// Эти функции находятся в VarInt.h
|
||
/// inline void throwReadAfterEOF()
|
||
/// inline void readChar(char & x, ReadBuffer & buf)
|
||
|
||
|
||
/// Чтение POD-типа в native формате
|
||
template <typename T>
|
||
inline void readPODBinary(T & x, ReadBuffer & buf)
|
||
{
|
||
buf.readStrict(reinterpret_cast<char *>(&x), sizeof(x));
|
||
}
|
||
|
||
template <typename T>
|
||
inline void readIntBinary(T & x, ReadBuffer & buf)
|
||
{
|
||
readPODBinary(x, buf);
|
||
}
|
||
|
||
template <typename T>
|
||
inline void readFloatBinary(T & x, ReadBuffer & buf)
|
||
{
|
||
readPODBinary(x, buf);
|
||
}
|
||
|
||
|
||
inline void readStringBinary(std::string & s, ReadBuffer & buf, size_t MAX_STRING_SIZE = DEFAULT_MAX_STRING_SIZE)
|
||
{
|
||
size_t size = 0;
|
||
readVarUInt(size, buf);
|
||
|
||
if (size > MAX_STRING_SIZE)
|
||
throw Poco::Exception("Too large string size.");
|
||
|
||
s.resize(size);
|
||
buf.readStrict(&s[0], size);
|
||
}
|
||
|
||
|
||
template <typename T>
|
||
void readVectorBinary(std::vector<T> & v, ReadBuffer & buf, size_t MAX_VECTOR_SIZE = DEFAULT_MAX_STRING_SIZE)
|
||
{
|
||
size_t size = 0;
|
||
readVarUInt(size, buf);
|
||
|
||
if (size > MAX_VECTOR_SIZE)
|
||
throw Poco::Exception("Too large vector size.");
|
||
|
||
v.resize(size);
|
||
for (size_t i = 0; i < size; ++i)
|
||
readBinary(v[i], buf);
|
||
}
|
||
|
||
|
||
void assertString(const char * s, ReadBuffer & buf);
|
||
void assertEOF(ReadBuffer & buf);
|
||
void assertChar(char symbol, ReadBuffer & buf);
|
||
|
||
inline void assertString(const String & s, ReadBuffer & buf)
|
||
{
|
||
assertString(s.c_str(), buf);
|
||
}
|
||
|
||
|
||
inline void readBoolText(bool & x, ReadBuffer & buf)
|
||
{
|
||
char tmp = '0';
|
||
readChar(tmp, buf);
|
||
x = tmp != '0';
|
||
}
|
||
|
||
|
||
template <typename T>
|
||
void readIntText(T & x, ReadBuffer & buf)
|
||
{
|
||
bool negative = false;
|
||
x = 0;
|
||
if (buf.eof())
|
||
throwReadAfterEOF();
|
||
|
||
while (!buf.eof())
|
||
{
|
||
switch (*buf.position())
|
||
{
|
||
case '+':
|
||
break;
|
||
case '-':
|
||
if (std::is_signed<T>::value)
|
||
negative = true;
|
||
else
|
||
return;
|
||
break;
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
x *= 10;
|
||
x += *buf.position() - '0';
|
||
break;
|
||
default:
|
||
if (negative)
|
||
x = -x;
|
||
return;
|
||
}
|
||
++buf.position();
|
||
}
|
||
if (negative)
|
||
x = -x;
|
||
}
|
||
|
||
|
||
/** Более оптимизированная версия (примерно в 1.5 раза на реальных данных).
|
||
* Отличается тем, что:
|
||
* - из чисел, начинающихся на ноль, парсится только ноль;
|
||
* - не поддерживается символ '+' перед числом;
|
||
* - символы :;<=>? парсятся, как некоторые цифры.
|
||
*/
|
||
template <typename T>
|
||
void readIntTextUnsafe(T & x, ReadBuffer & buf)
|
||
{
|
||
bool negative = false;
|
||
x = 0;
|
||
|
||
if (unlikely(buf.eof()))
|
||
throwReadAfterEOF();
|
||
|
||
if (std::is_signed<T>::value && *buf.position() == '-')
|
||
{
|
||
++buf.position();
|
||
negative = true;
|
||
if (unlikely(buf.eof()))
|
||
throwReadAfterEOF();
|
||
}
|
||
|
||
if (*buf.position() == '0') /// В реальных данных много нулей.
|
||
{
|
||
++buf.position();
|
||
return;
|
||
}
|
||
|
||
while (!buf.eof())
|
||
{
|
||
if ((*buf.position() & 0xF0) == 0x30) /// Имеет смысл, что это условие находится внутри цикла.
|
||
{
|
||
x *= 10;
|
||
x += *buf.position() & 0x0F;
|
||
++buf.position();
|
||
}
|
||
else
|
||
break;
|
||
}
|
||
|
||
if (std::is_signed<T>::value && negative)
|
||
x = -x;
|
||
}
|
||
|
||
|
||
/// грубо
|
||
template <typename T>
|
||
void readFloatText(T & x, ReadBuffer & buf)
|
||
{
|
||
bool negative = false;
|
||
x = 0;
|
||
bool after_point = false;
|
||
double power_of_ten = 1;
|
||
|
||
if (buf.eof())
|
||
throwReadAfterEOF();
|
||
|
||
while (!buf.eof())
|
||
{
|
||
switch (*buf.position())
|
||
{
|
||
case '+':
|
||
break;
|
||
case '-':
|
||
negative = true;
|
||
break;
|
||
case '.':
|
||
after_point = true;
|
||
break;
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
if (after_point)
|
||
{
|
||
power_of_ten /= 10;
|
||
x += (*buf.position() - '0') * power_of_ten;
|
||
}
|
||
else
|
||
{
|
||
x *= 10;
|
||
x += *buf.position() - '0';
|
||
}
|
||
break;
|
||
case 'e':
|
||
case 'E':
|
||
{
|
||
++buf.position();
|
||
Int32 exponent = 0;
|
||
readIntText(exponent, buf);
|
||
x *= exp10(exponent);
|
||
if (negative)
|
||
x = -x;
|
||
return;
|
||
}
|
||
case 'i':
|
||
++buf.position();
|
||
assertString("nf", buf);
|
||
x = std::numeric_limits<T>::infinity();
|
||
if (negative)
|
||
x = -x;
|
||
return;
|
||
case 'I':
|
||
++buf.position();
|
||
assertString("NF", buf);
|
||
x = std::numeric_limits<T>::infinity();
|
||
if (negative)
|
||
x = -x;
|
||
return;
|
||
case 'n':
|
||
++buf.position();
|
||
assertString("an", buf);
|
||
x = std::numeric_limits<T>::quiet_NaN();
|
||
return;
|
||
case 'N':
|
||
++buf.position();
|
||
assertString("AN", buf);
|
||
x = std::numeric_limits<T>::quiet_NaN();
|
||
return;
|
||
default:
|
||
if (negative)
|
||
x = -x;
|
||
return;
|
||
}
|
||
++buf.position();
|
||
}
|
||
if (negative)
|
||
x = -x;
|
||
}
|
||
|
||
|
||
/// грубо; всё до '\n' или '\t'
|
||
void readString(String & s, ReadBuffer & buf);
|
||
|
||
void readEscapedString(String & s, ReadBuffer & buf);
|
||
|
||
void readQuotedString(String & s, ReadBuffer & buf);
|
||
|
||
void readDoubleQuotedString(String & s, ReadBuffer & buf);
|
||
|
||
void readBackQuotedString(String & s, ReadBuffer & buf);
|
||
|
||
|
||
/// в формате YYYY-MM-DD
|
||
inline void readDateText(DayNum_t & date, ReadBuffer & buf)
|
||
{
|
||
char s[10];
|
||
size_t size = buf.read(s, 10);
|
||
if (10 != size)
|
||
{
|
||
s[size] = 0;
|
||
throw Exception(std::string("Cannot parse date ") + s, ErrorCodes::CANNOT_PARSE_DATE);
|
||
}
|
||
|
||
UInt16 year = (s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0');
|
||
UInt8 month = (s[5] - '0') * 10 + (s[6] - '0');
|
||
UInt8 day = (s[8] - '0') * 10 + (s[9] - '0');
|
||
|
||
date = DateLUT::instance().makeDayNum(year, month, day);
|
||
}
|
||
|
||
inline void readDateText(mysqlxx::Date & date, ReadBuffer & buf)
|
||
{
|
||
char s[10];
|
||
size_t size = buf.read(s, 10);
|
||
if (10 != size)
|
||
{
|
||
s[size] = 0;
|
||
throw Exception(std::string("Cannot parse date ") + s, ErrorCodes::CANNOT_PARSE_DATE);
|
||
}
|
||
|
||
date.year((s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0'));
|
||
date.month((s[5] - '0') * 10 + (s[6] - '0'));
|
||
date.day((s[8] - '0') * 10 + (s[9] - '0'));
|
||
}
|
||
|
||
|
||
template <typename T>
|
||
inline T parse(const char * data, size_t size);
|
||
|
||
|
||
void readDateTimeTextFallback(time_t & datetime, ReadBuffer & buf);
|
||
|
||
/** В формате YYYY-MM-DD hh:mm:ss, согласно текущему часовому поясу
|
||
* В качестве исключения, также поддерживается парсинг из десятичного числа - unix timestamp.
|
||
*/
|
||
inline void readDateTimeText(time_t & datetime, ReadBuffer & buf)
|
||
{
|
||
/** Считываем 10 символов, которые могут быть unix timestamp.
|
||
* При этом, поддерживается только unix timestamp из 10 символов - от 9 сентября 2001.
|
||
* Потом смотрим на пятый символ. Если это число - парсим unix timestamp.
|
||
* Если это не число - парсим YYYY-MM-DD hh:mm:ss.
|
||
*/
|
||
|
||
/// Оптимистичный вариант, когда всё значение точно лежит в буфере.
|
||
const char * s = buf.position();
|
||
if (s + 19 < buf.buffer().end())
|
||
{
|
||
if (s[4] < '0' || s[4] > '9')
|
||
{
|
||
UInt16 year = (s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0');
|
||
UInt8 month = (s[5] - '0') * 10 + (s[6] - '0');
|
||
UInt8 day = (s[8] - '0') * 10 + (s[9] - '0');
|
||
|
||
UInt8 hour = (s[11] - '0') * 10 + (s[12] - '0');
|
||
UInt8 minute = (s[14] - '0') * 10 + (s[15] - '0');
|
||
UInt8 second = (s[17] - '0') * 10 + (s[18] - '0');
|
||
|
||
if (unlikely(year == 0))
|
||
datetime = 0;
|
||
else
|
||
datetime = DateLUT::instance().makeDateTime(year, month, day, hour, minute, second);
|
||
|
||
buf.position() += 19;
|
||
}
|
||
else
|
||
readIntTextUnsafe(datetime, buf);
|
||
}
|
||
else
|
||
readDateTimeTextFallback(datetime, buf);
|
||
}
|
||
|
||
inline void readDateTimeText(mysqlxx::DateTime & datetime, ReadBuffer & buf)
|
||
{
|
||
char s[19];
|
||
size_t size = buf.read(s, 19);
|
||
if (19 != size)
|
||
{
|
||
s[size] = 0;
|
||
throw Exception(std::string("Cannot parse datetime ") + s, ErrorCodes::CANNOT_PARSE_DATETIME);
|
||
}
|
||
|
||
datetime.year((s[0] - '0') * 1000 + (s[1] - '0') * 100 + (s[2] - '0') * 10 + (s[3] - '0'));
|
||
datetime.month((s[5] - '0') * 10 + (s[6] - '0'));
|
||
datetime.day((s[8] - '0') * 10 + (s[9] - '0'));
|
||
|
||
datetime.hour((s[11] - '0') * 10 + (s[12] - '0'));
|
||
datetime.minute((s[14] - '0') * 10 + (s[15] - '0'));
|
||
datetime.second((s[17] - '0') * 10 + (s[18] - '0'));
|
||
}
|
||
|
||
|
||
/// Общие методы для чтения значения в бинарном формате.
|
||
inline void readBinary(UInt8 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(UInt16 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(UInt32 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(UInt64 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(Int8 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(Int16 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(Int32 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(Int64 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(Float32 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(Float64 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(String & x, ReadBuffer & buf) { readStringBinary(x, buf); }
|
||
inline void readBinary(bool & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(uint128 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
|
||
inline void readBinary(VisitID_t & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(mysqlxx::Date & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
inline void readBinary(mysqlxx::DateTime & x, ReadBuffer & buf) { readPODBinary(x, buf); }
|
||
|
||
|
||
/// Общие методы для чтения значения в текстовом виде из tab-separated формата.
|
||
inline void readText(UInt8 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(UInt16 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(UInt32 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(UInt64 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(Int8 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(Int16 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(Int32 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(Int64 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(Float32 & x, ReadBuffer & buf) { readFloatText(x, buf); }
|
||
inline void readText(Float64 & x, ReadBuffer & buf) { readFloatText(x, buf); }
|
||
inline void readText(String & x, ReadBuffer & buf) { readEscapedString(x, buf); }
|
||
inline void readText(bool & x, ReadBuffer & buf) { readBoolText(x, buf); }
|
||
|
||
inline void readText(VisitID_t & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readText(mysqlxx::Date & x, ReadBuffer & buf) { readDateText(x, buf); }
|
||
inline void readText(mysqlxx::DateTime & x, ReadBuffer & buf) { readDateTimeText(x, buf); }
|
||
|
||
|
||
/// Общие методы для чтения значения в текстовом виде, при необходимости, в кавычках.
|
||
inline void readQuoted(UInt8 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(UInt16 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(UInt32 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(UInt64 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(Int8 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(Int16 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(Int32 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(Int64 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readQuoted(Float32 & x, ReadBuffer & buf) { readFloatText(x, buf); }
|
||
inline void readQuoted(Float64 & x, ReadBuffer & buf) { readFloatText(x, buf); }
|
||
inline void readQuoted(String & x, ReadBuffer & buf) { readQuotedString(x, buf); }
|
||
inline void readQuoted(bool & x, ReadBuffer & buf) { readBoolText(x, buf); }
|
||
|
||
inline void readQuoted(VisitID_t & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
|
||
inline void readQuoted(mysqlxx::Date & x, ReadBuffer & buf)
|
||
{
|
||
assertString("'", buf);
|
||
readDateText(x, buf);
|
||
assertString("'", buf);
|
||
}
|
||
|
||
inline void readQuoted(mysqlxx::DateTime & x, ReadBuffer & buf)
|
||
{
|
||
assertString("'", buf);
|
||
readDateTimeText(x, buf);
|
||
assertString("'", buf);
|
||
}
|
||
|
||
|
||
/// В двойных кавычках
|
||
inline void readDoubleQuoted(UInt8 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(UInt16 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(UInt32 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(UInt64 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(Int8 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(Int16 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(Int32 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(Int64 & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
inline void readDoubleQuoted(Float32 & x, ReadBuffer & buf) { readFloatText(x, buf); }
|
||
inline void readDoubleQuoted(Float64 & x, ReadBuffer & buf) { readFloatText(x, buf); }
|
||
inline void readDoubleQuoted(String & x, ReadBuffer & buf) { readDoubleQuotedString(x, buf); }
|
||
inline void readDoubleQuoted(bool & x, ReadBuffer & buf) { readBoolText(x, buf); }
|
||
|
||
inline void readDoubleQuoted(VisitID_t & x, ReadBuffer & buf) { readIntText(x, buf); }
|
||
|
||
inline void readDoubleQuoted(mysqlxx::Date & x, ReadBuffer & buf)
|
||
{
|
||
assertString("\"", buf);
|
||
readDateText(x, buf);
|
||
assertString("\"", buf);
|
||
}
|
||
|
||
inline void readDoubleQuoted(mysqlxx::DateTime & x, ReadBuffer & buf)
|
||
{
|
||
assertString("\"", buf);
|
||
readDateTimeText(x, buf);
|
||
assertString("\"", buf);
|
||
}
|
||
|
||
|
||
template <typename T>
|
||
void readBinary(std::vector<T> & x, ReadBuffer & buf)
|
||
{
|
||
size_t size = 0;
|
||
readVarUInt(size, buf);
|
||
|
||
if (size > DEFAULT_MAX_STRING_SIZE)
|
||
throw Poco::Exception("Too large vector size.");
|
||
|
||
x.resize(size);
|
||
for (size_t i = 0; i < size; ++i)
|
||
readBinary(x[i], buf);
|
||
}
|
||
|
||
template <typename T>
|
||
void readQuoted(std::vector<T> & x, ReadBuffer & buf)
|
||
{
|
||
bool first = true;
|
||
assertString("[", buf);
|
||
while (!buf.eof() && *buf.position() != ']')
|
||
{
|
||
if (!first)
|
||
{
|
||
if (*buf.position() == ',')
|
||
++buf.position();
|
||
else
|
||
throw Exception("Cannot read array from text", ErrorCodes::CANNOT_READ_ARRAY_FROM_TEXT);
|
||
}
|
||
|
||
first = false;
|
||
|
||
x.push_back(T());
|
||
readQuoted(x.back(), buf);
|
||
}
|
||
assertString("]", buf);
|
||
}
|
||
|
||
template <typename T>
|
||
void readDoubleQuoted(std::vector<T> & x, ReadBuffer & buf)
|
||
{
|
||
bool first = true;
|
||
assertString("[", buf);
|
||
while (!buf.eof() && *buf.position() != ']')
|
||
{
|
||
if (!first)
|
||
{
|
||
if (*buf.position() == ',')
|
||
++buf.position();
|
||
else
|
||
throw Exception("Cannot read array from text", ErrorCodes::CANNOT_READ_ARRAY_FROM_TEXT);
|
||
}
|
||
|
||
first = false;
|
||
|
||
x.push_back(T());
|
||
readDoubleQuoted(x.back(), buf);
|
||
}
|
||
assertString("]", buf);
|
||
}
|
||
|
||
template <typename T>
|
||
void readText(std::vector<T> & x, ReadBuffer & buf)
|
||
{
|
||
readQuoted(x, buf);
|
||
}
|
||
|
||
|
||
/// Пропустить пробельные символы.
|
||
inline void skipWhitespaceIfAny(ReadBuffer & buf)
|
||
{
|
||
while (!buf.eof()
|
||
&& (*buf.position() == ' '
|
||
|| *buf.position() == '\t'
|
||
|| *buf.position() == '\n'
|
||
|| *buf.position() == '\r'
|
||
|| *buf.position() == '\f'))
|
||
++buf.position();
|
||
}
|
||
|
||
|
||
/** Прочитать сериализованный эксепшен.
|
||
* При сериализации/десериализации часть информации теряется
|
||
* (тип обрезается до базового, message заменяется на displayText, и stack trace дописывается в message)
|
||
* К нему может быть добавлено дополнительное сообщение (например, вы можете указать, откуда оно было прочитано).
|
||
*/
|
||
void readException(Exception & e, ReadBuffer & buf, const String & additional_message = "");
|
||
void readAndThrowException(ReadBuffer & buf, const String & additional_message = "");
|
||
|
||
|
||
/** Вспомогательная функция
|
||
*/
|
||
template <typename T>
|
||
static inline const char * tryReadIntText(T & x, const char * pos, const char * end)
|
||
{
|
||
bool negative = false;
|
||
x = 0;
|
||
if (pos >= end)
|
||
return pos;
|
||
|
||
while (pos < end)
|
||
{
|
||
switch (*pos)
|
||
{
|
||
case '+':
|
||
break;
|
||
case '-':
|
||
if (std::is_signed<T>::value)
|
||
negative = true;
|
||
else
|
||
return pos;
|
||
break;
|
||
case '0':
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
x *= 10;
|
||
x += *pos - '0';
|
||
break;
|
||
default:
|
||
if (negative)
|
||
x = -x;
|
||
return pos;
|
||
}
|
||
++pos;
|
||
}
|
||
if (negative)
|
||
x = -x;
|
||
return pos;
|
||
}
|
||
|
||
|
||
/// Простые для использования методы чтения чего-либо из строки в текстовом виде.
|
||
template <typename T>
|
||
inline T parse(const char * data, size_t size)
|
||
{
|
||
T res;
|
||
ReadBuffer buf(const_cast<char *>(data), size, 0);
|
||
readText(res, buf);
|
||
return res;
|
||
}
|
||
|
||
template <typename T>
|
||
inline T parse(const char * data)
|
||
{
|
||
return parse<T>(data, strlen(data));
|
||
}
|
||
|
||
template <typename T>
|
||
inline T parse(const String & s)
|
||
{
|
||
return parse<T>(s.data(), s.size());
|
||
}
|
||
|
||
}
|