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ClickHouse/dbms/src/IO/WriteHelpers.h
f1yegor b3e0533860 translate comments: IO
2017-05-28 16:29:40 +02:00

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#pragma once
#include <cstring>
#include <cstdio>
#include <limits>
#include <algorithm>
#include <common/DateLUT.h>
#include <common/LocalDate.h>
#include <common/LocalDateTime.h>
#include <common/find_first_symbols.h>
#include <Core/Types.h>
#include <Common/Exception.h>
#include <Common/StringUtils.h>
#include <Core/StringRef.h>
#include <IO/WriteBuffer.h>
#include <IO/WriteIntText.h>
#include <IO/VarInt.h>
#include <IO/WriteBufferFromString.h>
#include <IO/DoubleConverter.h>
#include <city.h>
namespace DB
{
namespace ErrorCodes
{
extern const int CANNOT_PRINT_FLOAT_OR_DOUBLE_NUMBER;
}
/// Helper functions for formatted and binary output.
inline void writeChar(char x, WriteBuffer & buf)
{
buf.nextIfAtEnd();
*buf.position() = x;
++buf.position();
}
/// Write POD-type in native format. It's recommended to use only with packed (dense) data types.
template <typename T>
inline void writePODBinary(const T & x, WriteBuffer & buf)
{
buf.write(reinterpret_cast<const char *>(&x), sizeof(x));
}
template <typename T>
inline void writeIntBinary(const T & x, WriteBuffer & buf)
{
writePODBinary(x, buf);
}
template <typename T>
inline void writeFloatBinary(const T & x, WriteBuffer & buf)
{
writePODBinary(x, buf);
}
inline void writeStringBinary(const std::string & s, WriteBuffer & buf)
{
writeVarUInt(s.size(), buf);
buf.write(s.data(), s.size());
}
inline void writeStringBinary(const char * s, WriteBuffer & buf)
{
writeVarUInt(strlen(s), buf);
buf.write(s, strlen(s));
}
inline void writeStringBinary(const StringRef & s, WriteBuffer & buf)
{
writeVarUInt(s.size, buf);
buf.write(s.data, s.size);
}
template <typename T>
void writeVectorBinary(const std::vector<T> & v, WriteBuffer & buf)
{
writeVarUInt(v.size(), buf);
for (typename std::vector<T>::const_iterator it = v.begin(); it != v.end(); ++it)
writeBinary(*it, buf);
}
inline void writeBoolText(bool x, WriteBuffer & buf)
{
writeChar(x ? '1' : '0', buf);
}
inline void writeFloatText(double x, WriteBuffer & buf)
{
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
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(buffer, builder.position());
}
inline void writeFloatText(float x, WriteBuffer & buf)
{
DoubleConverter<false>::BufferType buffer;
double_conversion::StringBuilder builder{buffer, sizeof(buffer)};
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(buffer, builder.position());
}
inline void writeString(const String & s, WriteBuffer & buf)
{
buf.write(s.data(), s.size());
}
inline void writeString(const char * data, size_t size, WriteBuffer & buf)
{
buf.write(data, size);
}
inline void writeString(const StringRef & ref, WriteBuffer & buf)
{
writeString(ref.data, ref.size, buf);
}
/** Writes a C-string without creating a temporary object. If the string is a literal, then `strlen` is executed at the compilation stage.
* Use when the string is a literal.
*/
#define writeCString(s, buf) \
(buf).write((s), strlen(s))
/** Writes a string for use in the JSON format:
* - the string is outputted in double quotes
* - forward slash character '/' is escaped
* - bytes from the range 0x00-0x1F except `\b', '\f', '\n', '\r', '\t' are escaped as \u00XX
* - code points U+2028 and U+2029 (byte sequences in UTF-8: e2 80 a8, e2 80 a9) are escaped as \u2028 and \u2029
* - it is assumed that string is the UTF-8 encoded, the invalid UTF-8 is not processed
* - non-ASCII characters remain as is
*/
inline void writeJSONString(const char * begin, const char * end, WriteBuffer & buf)
{
writeChar('"', buf);
for (const char * it = begin; it != end; ++it)
{
switch (*it)
{
case '\b':
writeChar('\\', buf);
writeChar('b', buf);
break;
case '\f':
writeChar('\\', buf);
writeChar('f', buf);
break;
case '\n':
writeChar('\\', buf);
writeChar('n', buf);
break;
case '\r':
writeChar('\\', buf);
writeChar('r', buf);
break;
case '\t':
writeChar('\\', buf);
writeChar('t', buf);
break;
case '\\':
writeChar('\\', buf);
writeChar('\\', buf);
break;
case '/':
writeChar('\\', buf);
writeChar('/', buf);
break;
case '"':
writeChar('\\', buf);
writeChar('"', buf);
break;
default:
if (0x00 <= *it && *it <= 0x1F)
{
char higher_half = (*it) >> 4;
char lower_half = (*it) & 0xF;
writeCString("\\u00", buf);
writeChar('0' + higher_half, buf);
if (0 <= lower_half && lower_half <= 9)
writeChar('0' + lower_half, buf);
else
writeChar('A' + lower_half - 10, buf);
}
else if (end - it >= 3 && it[0] == '\xE2' && it[1] == '\x80' && (it[2] == '\xA8' || it[2] == '\xA9'))
{
if (it[2] == '\xA8')
writeCString("\\u2028", buf);
if (it[2] == '\xA9')
writeCString("\\u2029", buf);
}
else
writeChar(*it, buf);
}
}
writeChar('"', buf);
}
template <char c>
void writeAnyEscapedString(const char * begin, const char * end, WriteBuffer & buf)
{
const char * pos = begin;
while (true)
{
/// On purpose we will escape more characters than minimally necessary.
const char * next_pos = find_first_symbols<'\b', '\f', '\n', '\r', '\t', '\0', '\\', c>(pos, end);
if (next_pos == end)
{
buf.write(pos, next_pos - pos);
break;
}
else
{
buf.write(pos, next_pos - pos);
pos = next_pos;
switch (*pos)
{
case '\b':
writeChar('\\', buf);
writeChar('b', buf);
break;
case '\f':
writeChar('\\', buf);
writeChar('f', buf);
break;
case '\n':
writeChar('\\', buf);
writeChar('n', buf);
break;
case '\r':
writeChar('\\', buf);
writeChar('r', buf);
break;
case '\t':
writeChar('\\', buf);
writeChar('t', buf);
break;
case '\0':
writeChar('\\', buf);
writeChar('0', buf);
break;
case '\\':
writeChar('\\', buf);
writeChar('\\', buf);
break;
case c:
writeChar('\\', buf);
writeChar(c, buf);
break;
default:
writeChar(*pos, buf);
}
++pos;
}
}
}
inline void writeJSONString(const String & s, WriteBuffer & buf)
{
writeJSONString(s.data(), s.data() + s.size(), buf);
}
inline void writeJSONString(const StringRef & ref, WriteBuffer & buf)
{
writeJSONString(ref.data, ref.data + ref.size, buf);
}
template <char c>
void writeAnyEscapedString(const String & s, WriteBuffer & buf)
{
writeAnyEscapedString<c>(s.data(), s.data() + s.size(), buf);
}
inline void writeEscapedString(const char * str, size_t size, WriteBuffer & buf)
{
writeAnyEscapedString<'\''>(str, str + size, buf);
}
inline void writeEscapedString(const String & s, WriteBuffer & buf)
{
writeEscapedString(s.data(), s.size(), buf);
}
inline void writeEscapedString(const StringRef & ref, WriteBuffer & buf)
{
writeEscapedString(ref.data, ref.size, buf);
}
template <char c>
void writeAnyQuotedString(const char * begin, const char * end, WriteBuffer & buf)
{
writeChar(c, buf);
writeAnyEscapedString<c>(begin, end, buf);
writeChar(c, buf);
}
template <char c>
void writeAnyQuotedString(const String & s, WriteBuffer & buf)
{
writeAnyQuotedString<c>(s.data(), s.data() + s.size(), buf);
}
template <char c>
void writeAnyQuotedString(const StringRef & ref, WriteBuffer & buf)
{
writeAnyQuotedString<c>(ref.data, ref.data + ref.size, buf);
}
inline void writeQuotedString(const String & s, WriteBuffer & buf)
{
writeAnyQuotedString<'\''>(s, buf);
}
inline void writeQuotedString(const StringRef & ref, WriteBuffer & buf)
{
writeAnyQuotedString<'\''>(ref, buf);
}
inline void writeDoubleQuotedString(const String & s, WriteBuffer & buf)
{
writeAnyQuotedString<'"'>(s, buf);
}
/// Outputs a string in backquotes, as an identifier in MySQL.
inline void writeBackQuotedString(const String & s, WriteBuffer & buf)
{
writeAnyQuotedString<'`'>(s, buf);
}
/// The same, but backquotes apply only if there are characters that do not match the identifier without backquotes.
inline void writeProbablyBackQuotedString(const String & s, WriteBuffer & buf)
{
if (s.empty() || !isValidIdentifierBegin(s[0]))
writeBackQuotedString(s, buf);
else
{
const char * pos = s.data() + 1;
const char * end = s.data() + s.size();
for (; pos < end; ++pos)
if (!isWordCharASCII(*pos))
break;
if (pos != end)
writeBackQuotedString(s, buf);
else
writeString(s, buf);
}
}
/** Outputs the string in for the CSV format.
* Rules:
* - the string is outputted in quotation marks;
* - the quotation mark inside the string is outputted as two quotation marks in sequence.
*/
template <char quote = '"'>
void writeCSVString(const char * begin, const char * end, WriteBuffer & buf)
{
writeChar(quote, buf);
const char * pos = begin;
while (true)
{
const char * next_pos = find_first_symbols<quote>(pos, end);
if (next_pos == end)
{
buf.write(pos, end - pos);
break;
}
else /// Quotation.
{
++next_pos;
buf.write(pos, next_pos - pos);
writeChar(quote, buf);
}
pos = next_pos;
}
writeChar(quote, buf);
}
template <char quote = '"'>
void writeCSVString(const String & s, WriteBuffer & buf)
{
writeCSVString<quote>(s.data(), s.data() + s.size(), buf);
}
template <char quote = '"'>
void writeCSVString(const StringRef & s, WriteBuffer & buf)
{
writeCSVString<quote>(s.data, s.data + s.size, buf);
}
/// Writing a string to a text node in XML (not into an attribute - otherwise you need more escaping).
inline void writeXMLString(const char * begin, const char * end, WriteBuffer & buf)
{
const char * pos = begin;
while (true)
{
/// NOTE Perhaps for some XML parsers, you need to escape the zero byte and some control characters.
const char * next_pos = find_first_symbols<'<', '&'>(pos, end);
if (next_pos == end)
{
buf.write(pos, end - pos);
break;
}
else if (*next_pos == '<')
{
buf.write(pos, next_pos - pos);
++next_pos;
writeCString("&lt;", buf);
}
else if (*next_pos == '&')
{
buf.write(pos, next_pos - pos);
++next_pos;
writeCString("&amp;", buf);
}
pos = next_pos;
}
}
inline void writeXMLString(const String & s, WriteBuffer & buf)
{
writeXMLString(s.data(), s.data() + s.size(), buf);
}
inline void writeXMLString(const StringRef & s, WriteBuffer & buf)
{
writeXMLString(s.data, s.data + s.size, buf);
}
/// in YYYY-MM-DD format
inline void writeDateText(DayNum_t date, WriteBuffer & buf)
{
char s[10] = {'0', '0', '0', '0', '-', '0', '0', '-', '0', '0'};
if (unlikely(date > DATE_LUT_MAX_DAY_NUM || date == 0))
{
buf.write(s, 10);
return;
}
const auto & values = DateLUT::instance().getValues(date);
s[0] += values.year / 1000;
s[1] += (values.year / 100) % 10;
s[2] += (values.year / 10) % 10;
s[3] += values.year % 10;
s[5] += values.month / 10;
s[6] += values.month % 10;
s[8] += values.day_of_month / 10;
s[9] += values.day_of_month % 10;
buf.write(s, 10);
}
inline void writeDateText(LocalDate date, WriteBuffer & buf)
{
char s[10] = {'0', '0', '0', '0', '-', '0', '0', '-', '0', '0'};
s[0] += date.year() / 1000;
s[1] += (date.year() / 100) % 10;
s[2] += (date.year() / 10) % 10;
s[3] += date.year() % 10;
s[5] += date.month() / 10;
s[6] += date.month() % 10;
s[8] += date.day() / 10;
s[9] += date.day() % 10;
buf.write(s, 10);
}
/// in the format YYYY-MM-DD HH:MM:SS, according to the current time zone
template <char date_delimeter = '-', char time_delimeter = ':'>
inline void writeDateTimeText(time_t datetime, WriteBuffer & buf, const DateLUTImpl & date_lut = DateLUT::instance())
{
char s[19] = {'0', '0', '0', '0', date_delimeter, '0', '0', date_delimeter, '0', '0', ' ', '0', '0', time_delimeter, '0', '0', time_delimeter, '0', '0'};
if (unlikely(datetime > DATE_LUT_MAX || datetime == 0))
{
buf.write(s, 19);
return;
}
const auto & values = date_lut.getValues(datetime);
s[0] += values.year / 1000;
s[1] += (values.year / 100) % 10;
s[2] += (values.year / 10) % 10;
s[3] += values.year % 10;
s[5] += values.month / 10;
s[6] += values.month % 10;
s[8] += values.day_of_month / 10;
s[9] += values.day_of_month % 10;
UInt8 hour = date_lut.toHour(datetime);
UInt8 minute = date_lut.toMinuteInaccurate(datetime);
UInt8 second = date_lut.toSecondInaccurate(datetime);
s[11] += hour / 10;
s[12] += hour % 10;
s[14] += minute / 10;
s[15] += minute % 10;
s[17] += second / 10;
s[18] += second % 10;
buf.write(s, 19);
}
template <char date_delimeter = '-', char time_delimeter = ':'>
inline void writeDateTimeText(LocalDateTime datetime, WriteBuffer & buf)
{
char s[19] = {'0', '0', '0', '0', date_delimeter, '0', '0', date_delimeter, '0', '0', ' ', '0', '0', time_delimeter, '0', '0', time_delimeter, '0', '0'};
s[0] += datetime.year() / 1000;
s[1] += (datetime.year() / 100) % 10;
s[2] += (datetime.year() / 10) % 10;
s[3] += datetime.year() % 10;
s[5] += datetime.month() / 10;
s[6] += datetime.month() % 10;
s[8] += datetime.day() / 10;
s[9] += datetime.day() % 10;
s[11] += datetime.hour() / 10;
s[12] += datetime.hour() % 10;
s[14] += datetime.minute() / 10;
s[15] += datetime.minute() % 10;
s[17] += datetime.second() / 10;
s[18] += datetime.second() % 10;
buf.write(s, 19);
}
/// Methods of output in binary form
template <typename T>
inline typename std::enable_if<std::is_arithmetic<T>::value, void>::type
writeBinary(const T & x, WriteBuffer & buf) { writePODBinary(x, buf); }
inline void writeBinary(const String & x, WriteBuffer & buf) { writeStringBinary(x, buf); }
inline void writeBinary(const StringRef & x, WriteBuffer & buf) { writeStringBinary(x, buf); }
inline void writeBinary(const uint128 & x, WriteBuffer & buf) { writePODBinary(x, buf); }
inline void writeBinary(const LocalDate & x, WriteBuffer & buf) { writePODBinary(x, buf); }
inline void writeBinary(const LocalDateTime & x, WriteBuffer & buf) { writePODBinary(x, buf); }
/// Methods for outputting the value in text form for a tab-separated format.
template <typename T>
inline typename std::enable_if<std::is_integral<T>::value, void>::type
writeText(const T & x, WriteBuffer & buf) { writeIntText(x, buf); }
template <typename T>
inline typename std::enable_if<std::is_floating_point<T>::value, void>::type
writeText(const T & x, WriteBuffer & buf) { writeFloatText(x, buf); }
inline void writeText(const String & x, WriteBuffer & buf) { writeEscapedString(x, buf); }
/// Implemented as template specialization (not function overload) to avoid preference over templates on arithmetic types above.
template <> inline void writeText<bool>(const bool & x, WriteBuffer & buf) { writeBoolText(x, buf); }
/// unlike the method for std::string
/// assumes here that `x` is a null-terminated string.
inline void writeText(const char * x, WriteBuffer & buf) { writeEscapedString(x, strlen(x), buf); }
inline void writeText(const char * x, size_t size, WriteBuffer & buf) { writeEscapedString(x, size, buf); }
inline void writeText(const LocalDate & x, WriteBuffer & buf) { writeDateText(x, buf); }
inline void writeText(const LocalDateTime & x, WriteBuffer & buf) { writeDateTimeText(x, buf); }
/// String, date, datetime are in single quotes with C-style escaping. Numbers - without.
template <typename T>
inline typename std::enable_if<std::is_arithmetic<T>::value, void>::type
writeQuoted(const T & x, WriteBuffer & buf) { writeText(x, buf); }
inline void writeQuoted(const String & x, WriteBuffer & buf) { writeQuotedString(x, buf); }
inline void writeQuoted(const LocalDate & x, WriteBuffer & buf)
{
writeChar('\'', buf);
writeDateText(x, buf);
writeChar('\'', buf);
}
inline void writeQuoted(const LocalDateTime & x, WriteBuffer & buf)
{
writeChar('\'', buf);
writeDateTimeText(x, buf);
writeChar('\'', buf);
}
/// String, date, datetime are in double quotes with C-style escaping. Numbers - without.
template <typename T>
inline typename std::enable_if<std::is_arithmetic<T>::value, void>::type
writeDoubleQuoted(const T & x, WriteBuffer & buf) { writeText(x, buf); }
inline void writeDoubleQuoted(const String & x, WriteBuffer & buf) { writeDoubleQuotedString(x, buf); }
inline void writeDoubleQuoted(const LocalDate & x, WriteBuffer & buf)
{
writeChar('"', buf);
writeDateText(x, buf);
writeChar('"', buf);
}
inline void writeDoubleQuoted(const LocalDateTime & x, WriteBuffer & buf)
{
writeChar('"', buf);
writeDateTimeText(x, buf);
writeChar('"', buf);
}
/// String - in double quotes and with CSV-escaping; date, datetime - in double quotes. Numbers - without.
template <typename T>
inline typename std::enable_if<std::is_arithmetic<T>::value, void>::type
writeCSV(const T & x, WriteBuffer & buf) { writeText(x, buf); }
inline void writeCSV(const String & x, WriteBuffer & buf) { writeCSVString<>(x, buf); }
inline void writeCSV(const LocalDate & x, WriteBuffer & buf) { writeDoubleQuoted(x, buf); }
inline void writeCSV(const LocalDateTime & x, WriteBuffer & buf) { writeDoubleQuoted(x, buf); }
template <typename T>
void writeBinary(const std::vector<T> & x, WriteBuffer & buf)
{
size_t size = x.size();
writeVarUInt(size, buf);
for (size_t i = 0; i < size; ++i)
writeBinary(x[i], buf);
}
template <typename T>
void writeQuoted(const std::vector<T> & x, WriteBuffer & buf)
{
writeChar('[', buf);
for (size_t i = 0, size = x.size(); i < size; ++i)
{
if (i != 0)
writeChar(',', buf);
writeQuoted(x[i], buf);
}
writeChar(']', buf);
}
template <typename T>
void writeDoubleQuoted(const std::vector<T> & x, WriteBuffer & buf)
{
writeChar('[', buf);
for (size_t i = 0, size = x.size(); i < size; ++i)
{
if (i != 0)
writeChar(',', buf);
writeDoubleQuoted(x[i], buf);
}
writeChar(']', buf);
}
template <typename T>
void writeText(const std::vector<T> & x, WriteBuffer & buf)
{
writeQuoted(x, buf);
}
/// Serialize exception (so that it can be transferred over the network)
void writeException(const Exception & e, WriteBuffer & buf);
/// An easy-to-use method for converting something to a string in text form.
template <typename T>
inline String toString(const T & x)
{
String res;
{
WriteBufferFromString buf(res);
writeText(x, buf);
}
return res;
}
}
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