ClickHouse/dbms/include/DB/IO/ReadHelpers.h

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#pragma once
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#include <cmath>
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#include <cstring>
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#include <limits>
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#include <algorithm>
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#include <type_traits>
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#include <common/Common.h>
#include <common/DateLUT.h>
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#include <common/LocalDate.h>
#include <common/LocalDateTime.h>
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#include <DB/Core/Types.h>
#include <DB/Core/StringRef.h>
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#include <DB/Common/Exception.h>
#include <DB/Common/StringUtils.h>
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#include <DB/Common/Arena.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/VarInt.h>
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#include <city.h>
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#define DEFAULT_MAX_STRING_SIZE 0x00FFFFFFULL
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namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_PARSE_DATE;
extern const int CANNOT_PARSE_DATETIME;
extern const int CANNOT_READ_ARRAY_FROM_TEXT;
}
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/// Функции-помошники для форматированного чтения
inline char parseEscapeSequence(char c)
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{
switch(c)
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{
case 'a':
return '\a';
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case 'b':
return '\b';
case 'f':
return '\f';
case 'n':
return '\n';
case 'r':
return '\r';
case 't':
return '\t';
case 'v':
return '\v';
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case '0':
return '\0';
default:
return c;
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}
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}
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inline char unhex(char c)
{
switch (c)
{
case '0' ... '9':
return c - '0';
case 'a' ... 'f':
return c - 'a' + 10;
case 'A' ... 'F':
return c - 'A' + 10;
default:
return 0;
}
}
/// Эти функции находятся в VarInt.h
/// inline void throwReadAfterEOF()
inline void readChar(char & x, ReadBuffer & buf)
{
if (!buf.eof())
{
x = *buf.position();
++buf.position();
}
else
throwReadAfterEOF();
}
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/// Чтение POD-типа в native формате
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template <typename T>
inline void readPODBinary(T & x, ReadBuffer & buf)
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{
buf.readStrict(reinterpret_cast<char *>(&x), sizeof(x));
}
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template <typename T>
inline void readIntBinary(T & x, ReadBuffer & buf)
{
readPODBinary(x, buf);
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}
template <typename T>
inline void readFloatBinary(T & x, ReadBuffer & buf)
{
readPODBinary(x, buf);
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}
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inline void readStringBinary(std::string & s, ReadBuffer & buf, size_t MAX_STRING_SIZE = DEFAULT_MAX_STRING_SIZE)
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{
size_t size = 0;
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readVarUInt(size, buf);
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if (size > MAX_STRING_SIZE)
throw Poco::Exception("Too large string size.");
s.resize(size);
buf.readStrict(&s[0], size);
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}
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inline StringRef readStringBinaryInto(Arena & arena, ReadBuffer & buf)
{
size_t size = 0;
readVarUInt(size, buf);
char * data = arena.alloc(size);
buf.readStrict(data, size);
return StringRef(data, 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;
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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);
}
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void assertString(const char * s, ReadBuffer & buf);
void assertEOF(ReadBuffer & buf);
void assertChar(char symbol, ReadBuffer & buf);
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inline void assertString(const String & s, ReadBuffer & buf)
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{
assertString(s.c_str(), buf);
}
bool checkString(const char * s, ReadBuffer & buf);
inline bool checkString(const String & s, ReadBuffer & buf)
{
return checkString(s.c_str(), buf);
}
inline bool checkChar(char c, ReadBuffer & buf)
{
if (buf.eof() || *buf.position() != c)
return false;
++buf.position();
return true;
}
inline void readBoolText(bool & x, ReadBuffer & buf)
{
char tmp = '0';
readChar(tmp, buf);
x = tmp != '0';
}
template <typename T, typename ReturnType = void>
ReturnType readIntTextImpl(T & x, ReadBuffer & buf)
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{
static constexpr bool throw_exception = std::is_same<ReturnType, void>::value;
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bool negative = false;
x = 0;
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if (buf.eof())
{
if (throw_exception)
throwReadAfterEOF();
else
return ReturnType(false);
}
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while (!buf.eof())
{
switch (*buf.position())
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{
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case '+':
break;
case '-':
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if (std::is_signed<T>::value)
negative = true;
else
return ReturnType(false);
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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)
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x = -x;
return ReturnType(true);
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}
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++buf.position();
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}
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if (negative)
x = -x;
return ReturnType(true);
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}
template <typename T>
void readIntText(T & x, ReadBuffer & buf)
{
readIntTextImpl<T, void>(x, buf);
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}
template <typename T>
bool tryReadIntText(T & x, ReadBuffer & buf)
{
return readIntTextImpl<T, bool>(x, buf);
}
/** 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, bool throw_on_error = true>
void readIntTextUnsafe(T & x, ReadBuffer & buf)
{
bool negative = false;
x = 0;
auto on_error = []
{
if (throw_on_error)
throwReadAfterEOF();
};
if (unlikely(buf.eof()))
return on_error();
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if (std::is_signed<T>::value && *buf.position() == '-')
{
++buf.position();
negative = true;
if (unlikely(buf.eof()))
return on_error();
}
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;
}
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if (std::is_signed<T>::value && negative)
x = -x;
}
template<typename T>
void tryReadIntTextUnsafe(T & x, ReadBuffer & buf)
{
return readIntTextUnsafe<T, false>(x, buf);
}
template <bool throw_exception, class ExcepFun, class NoExcepFun, class... Args>
bool exceptionPolicySelector(ExcepFun && excep_f, NoExcepFun && no_excep_f, Args &&... args)
{
if (throw_exception)
{
excep_f(std::forward<Args>(args)...);
return true;
}
else
return no_excep_f(std::forward<Args>(args)...);
};
/// Returns true, iff parsed.
bool parseInfinity(ReadBuffer & buf);
bool parseNaN(ReadBuffer & buf);
void assertInfinity(ReadBuffer & buf);
void assertNaN(ReadBuffer & buf);
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/// Rough: not exactly nearest machine representable number is returned.
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/// Some garbage may be successfully parsed, examples: '.' parsed as 0; 123Inf parsed as inf.
template <typename T, typename ReturnType, char point_symbol = '.'>
ReturnType readFloatTextImpl(T & x, ReadBuffer & buf)
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{
static constexpr bool throw_exception = std::is_same<ReturnType, void>::value;
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bool negative = false;
x = 0;
bool after_point = false;
double power_of_ten = 1;
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if (buf.eof())
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{
if (throw_exception)
throwReadAfterEOF();
else
return ReturnType(false);
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}
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while (!buf.eof())
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{
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switch (*buf.position())
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{
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case '+':
break;
case '-':
negative = true;
break;
case point_symbol:
after_point = true;
break;
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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':
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{
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++buf.position();
Int32 exponent = 0;
bool res = exceptionPolicySelector<throw_exception>(readIntText<Int32>, tryReadIntText<Int32>, exponent, buf);
if (res)
{
x *= exp10(exponent);
if (negative)
x = -x;
}
return ReturnType(res);
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}
case 'i':
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case 'I':
{
bool res = exceptionPolicySelector<throw_exception>(assertInfinity, parseInfinity, buf);
if (res)
{
x = std::numeric_limits<T>::infinity();
if (negative)
x = -x;
}
return ReturnType(res);
}
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case 'n':
case 'N':
{
bool res = exceptionPolicySelector<throw_exception>(assertNaN, parseNaN, buf);
if (res)
{
x = std::numeric_limits<T>::quiet_NaN();
if (negative)
x = -x;
}
return ReturnType(res);
}
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default:
{
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if (negative)
x = -x;
return ReturnType(true);
}
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}
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++buf.position();
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}
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if (negative)
x = -x;
return ReturnType(true);
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}
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template <class T>
inline bool tryReadFloatText(T & x, ReadBuffer & buf)
{
return readFloatTextImpl<T, bool>(x, buf);
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}
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template <class T>
inline void readFloatText(T & x, ReadBuffer & buf)
{
readFloatTextImpl<T, void>(x, buf);
}
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/// грубо; всё до '\n' или '\t'
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void readString(String & s, ReadBuffer & buf);
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void readEscapedString(String & s, ReadBuffer & buf);
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void readQuotedString(String & s, ReadBuffer & buf);
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void readDoubleQuotedString(String & s, ReadBuffer & buf);
void readJSONString(String & s, ReadBuffer & buf);
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void readBackQuotedString(String & s, ReadBuffer & buf);
void readStringUntilEOF(String & s, ReadBuffer & buf);
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/** Прочитать строку в формате CSV.
* Правила:
* - строка может быть заключена в кавычки; кавычки могут быть одинарными: ' или двойными: ";
* - а может быть не заключена в кавычки - это определяется по первому символу;
* - если строка не заключена в кавычки, то она читается до следующего разделителя,
* либо до перевода строки (CR или LF),
* либо до конца потока;
* при этом, пробелы и табы на конце строки съедаются, но игнорируются.
* - если строка заключена в кавычки, то она читается до закрывающей кавычки,
* но при этом, последовательность двух подряд идущих кавычек, считается одной кавычкой внутри строки;
*/
void readCSVString(String & s, ReadBuffer & buf, const char delimiter = ',');
/// Добавляют прочитанный результат в массив символов.
template <typename Vector>
void readStringInto(Vector & s, ReadBuffer & buf);
template <typename Vector>
void readEscapedStringInto(Vector & s, ReadBuffer & buf);
template <typename Vector>
void readQuotedStringInto(Vector & s, ReadBuffer & buf);
template <typename Vector>
void readDoubleQuotedStringInto(Vector & s, ReadBuffer & buf);
template <typename Vector>
void readBackQuotedStringInto(Vector & s, ReadBuffer & buf);
template <typename Vector>
void readStringUntilEOFInto(Vector & s, ReadBuffer & buf);
template <typename Vector>
void readCSVStringInto(Vector & s, ReadBuffer & buf, const char delimiter = ',');
template <typename Vector>
void readJSONStringInto(Vector & s, ReadBuffer & buf);
/// Это можно использовать в качестве параметра шаблона для функций выше, если данные не надо никуда считывать, но нужно просто пропустить.
struct NullSink
{
void append(const char *, size_t) {};
void push_back(char) {};
};
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/// в формате YYYY-MM-DD
inline void readDateText(DayNum_t & date, ReadBuffer & buf)
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{
char s[10];
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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);
}
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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');
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date = DateLUT::instance().makeDayNum(year, month, day);
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}
inline void readDateText(LocalDate & 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'));
}
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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.
*/
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inline void readDateTimeText(time_t & datetime, ReadBuffer & buf)
{
/** Считываем 10 символов, которые могут быть unix timestamp.
* При этом, поддерживается только unix timestamp из 5-10 символов.
* 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');
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if (unlikely(year == 0))
datetime = 0;
else
datetime = DateLUT::instance().makeDateTime(year, month, day, hour, minute, second);
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buf.position() += 19;
}
else
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/// Почему не readIntTextUnsafe? Дело в том, что для нужд AdFox, поддерживается парсинг unix timestamp с отбивкой нулями: 000...NNNN.
readIntText(datetime, buf);
}
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else
readDateTimeTextFallback(datetime, buf);
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}
inline void readDateTimeText(LocalDateTime & 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); }
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inline void readBinary(uint128 & x, ReadBuffer & buf) { readPODBinary(x, buf); }
inline void readBinary(VisitID_t & x, ReadBuffer & buf) { readPODBinary(x, buf); }
inline void readBinary(LocalDate & x, ReadBuffer & buf) { readPODBinary(x, buf); }
inline void readBinary(LocalDateTime & 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(LocalDate & x, ReadBuffer & buf) { readDateText(x, buf); }
inline void readText(LocalDateTime & x, ReadBuffer & buf) { readDateTimeText(x, buf); }
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/// 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(LocalDate & x, ReadBuffer & buf)
{
assertChar('\'', buf);
readDateText(x, buf);
assertChar('\'', buf);
}
inline void readQuoted(LocalDateTime & x, ReadBuffer & buf)
{
assertChar('\'', buf);
readDateTimeText(x, buf);
assertChar('\'', 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(LocalDate & x, ReadBuffer & buf)
{
assertChar('"', buf);
readDateText(x, buf);
assertChar('"', buf);
}
inline void readDoubleQuoted(LocalDateTime & x, ReadBuffer & buf)
{
assertChar('"', buf);
readDateTimeText(x, buf);
assertChar('"', buf);
}
/// CSV, для чисел, дат, дат-с-временем: кавычки не обязательны, специального эскейпинга нет.
template <typename T>
inline void readCSVSimple(T & x, ReadBuffer & buf)
{
if (buf.eof())
throwReadAfterEOF();
char maybe_quote = *buf.position();
if (maybe_quote == '\'' || maybe_quote == '\"')
++buf.position();
readText(x, buf);
if (maybe_quote == '\'' || maybe_quote == '\"')
assertChar(maybe_quote, buf);
}
inline void readCSV(UInt8 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(UInt16 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(UInt32 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(UInt64 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Int8 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Int16 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Int32 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Int64 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Float32 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(Float64 & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(String & x, ReadBuffer & buf, const char delimiter = ',') { readCSVString(x, buf, delimiter); }
inline void readCSV(bool & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(VisitID_t & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(LocalDate & x, ReadBuffer & buf) { readCSVSimple(x, buf); }
inline void readCSV(LocalDateTime & x, ReadBuffer & buf) { readCSVSimple(x, 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;
assertChar('[', 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);
}
assertChar(']', buf);
}
template <typename T>
void readDoubleQuoted(std::vector<T> & x, ReadBuffer & buf)
{
bool first = true;
assertChar('[', 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);
}
assertChar(']', buf);
}
template <typename T>
void readText(std::vector<T> & x, ReadBuffer & buf)
{
readQuoted(x, buf);
}
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/// Пропустить пробельные символы.
inline void skipWhitespaceIfAny(ReadBuffer & buf)
{
while (!buf.eof() && isWhitespaceASCII(*buf.position()))
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++buf.position();
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}
/// Skips json value. If the value contains objects (i.e. {...} sequence), an exception will be thrown.
void skipJSONFieldPlain(ReadBuffer & buf, const StringRef & name_of_filed);
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/** 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 '-':
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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;
}
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/// 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;
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ReadBuffer buf(const_cast<char *>(data), size, 0);
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readText(res, buf);
return res;
}
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template <typename T>
inline T parse(const char * data)
{
return parse<T>(data, strlen(data));
}
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template <typename T>
inline T parse(const String & s)
{
return parse<T>(s.data(), s.size());
}
/** Skip UTF-8 BOM if it is under cursor.
* As BOM is usually located at start of stream, and buffer size is usually larger than three bytes,
* the function expects, that all three bytes of BOM is fully in buffer (otherwise it don't skip anything).
*/
inline void skipBOMIfExists(ReadBuffer & buf)
{
if (!buf.eof()
&& buf.position() + 3 < buf.buffer().end()
&& buf.position()[0] == '\xEF'
&& buf.position()[1] == '\xBB'
&& buf.position()[2] == '\xBF')
{
buf.position() += 3;
}
}
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}