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483 lines
10 KiB
C++
483 lines
10 KiB
C++
#pragma once
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#include <cstring>
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#include <iostream>
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#include <type_traits>
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#include <mysqlxx/Types.h>
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#include <mysqlxx/Row.h>
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#include <mysqlxx/Null.h>
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namespace mysqlxx
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{
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/** @brief Манипулятор ostream, который escape-ит строки для записи в tab delimited файл.
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* Использование: tab_separated_ostr << mysqlxx::escape << x;
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*/
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enum escape_enum
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{
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escape
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};
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/** @brief Манипулятор ostream, который quote-ит строки для записи в MySQL запрос.
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* Внимание! Не использует функции MySQL API, а использует свой метод quote-инга,
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* который может быть некорректным при использовании некоторых кодировок
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* (multi-byte attack), а также может оказаться некорректным при изменении libmysqlclient.
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* Это сделано для увеличения производительности и это имеет значение.
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*
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* Использование: query << mysqlxx::quote << x;
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*/
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enum quote_enum
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{
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quote
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};
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struct EscapeManipResult
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{
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std::ostream & ostr;
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EscapeManipResult(std::ostream & ostr_) : ostr(ostr_) {}
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std::ostream & operator<< (bool value) { return ostr << static_cast<int>(value); }
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std::ostream & operator<< (char value) { return ostr << static_cast<int>(value); }
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std::ostream & operator<< (unsigned char value) { return ostr << static_cast<int>(value); }
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std::ostream & operator<< (signed char value) { return ostr << static_cast<int>(value); }
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template <typename T>
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typename std::enable_if<std::is_arithmetic<T>::value, std::ostream &>::type
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operator<< (T value) { return ostr << value; }
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std::ostream & operator<< (LocalDate value) { return ostr << value; }
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std::ostream & operator<< (LocalDateTime value) { return ostr << value; }
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std::ostream & operator<< (const std::string & value)
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{
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writeEscapedData(value.data(), value.length());
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return ostr;
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}
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std::ostream & operator<< (const char * value)
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{
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while (const char * it = std::strpbrk(value, "\t\n\\"))
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{
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ostr.write(value, it - value);
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switch (*it)
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{
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case '\t':
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ostr.write("\\t", 2);
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break;
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case '\n':
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ostr.write("\\n", 2);
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break;
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case '\\':
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ostr.write("\\\\", 2);
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break;
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default:
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;
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}
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value = it + 1;
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}
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return ostr << value;
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}
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std::ostream & operator<< (const Value & string)
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{
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writeEscapedData(string.data(), string.size());
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return ostr;
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}
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std::ostream & operator<< (const Row & row)
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{
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for (size_t i = 0; i < row.size(); ++i)
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{
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if (i != 0)
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ostr << '\t';
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if (row[i].isNull())
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{
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ostr << "\\N";
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continue;
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}
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(*this) << row[i];
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}
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return ostr;
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}
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template <typename T>
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std::ostream & operator<< (const Null<T> & value)
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{
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if(value.is_null)
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ostr << "\\N";
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else
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*this << value.data;
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return ostr ;
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}
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template <typename T>
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std::ostream & operator<< (const std::vector<T> & value)
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{
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throw Poco::Exception(std::string(__PRETTY_FUNCTION__) + " is not implemented");
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}
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private:
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void writeEscapedData(const char * data, size_t length)
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{
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size_t i = 0;
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while (true)
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{
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size_t remaining_length = std::strlen(data);
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(*this) << data;
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if (i + remaining_length == length)
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break;
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ostr.write("\\0", 2);
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i += remaining_length + 1;
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data += remaining_length + 1;
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}
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}
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};
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inline EscapeManipResult operator<< (std::ostream & ostr, escape_enum manip)
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{
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return EscapeManipResult(ostr);
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}
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struct QuoteManipResult
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{
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public:
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std::ostream & ostr;
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QuoteManipResult(std::ostream & ostr_) : ostr(ostr_) {}
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std::ostream & operator<< (bool value) { return ostr << static_cast<int>(value); }
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std::ostream & operator<< (char value) { return ostr << static_cast<int>(value); }
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std::ostream & operator<< (unsigned char value) { return ostr << static_cast<int>(value); }
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std::ostream & operator<< (signed char value) { return ostr << static_cast<int>(value); }
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template <typename T>
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typename std::enable_if<std::is_arithmetic<T>::value, std::ostream &>::type
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operator<< (T value) { return ostr << value; }
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std::ostream & operator<< (LocalDate value) { return ostr << '\'' << value << '\''; }
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std::ostream & operator<< (LocalDateTime value) { return ostr << '\'' << value << '\''; }
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std::ostream & operator<< (const std::string & value)
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{
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ostr.put('\'');
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writeEscapedData(value.data(), value.length());
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ostr.put('\'');
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return ostr;
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}
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std::ostream & operator<< (const char * value)
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{
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ostr.put('\'');
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writeEscapedCString(value);
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ostr.put('\'');
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return ostr;
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}
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template <typename T>
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std::ostream & operator<< (const Null<T> & value)
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{
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if(value.is_null)
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{
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ostr << "\\N";
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}
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else
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{
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*this << value.data;
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}
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return ostr ;
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}
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template <typename T>
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std::ostream & operator<< (const std::vector<T> & value)
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{
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throw Poco::Exception(std::string(__PRETTY_FUNCTION__) + " is not implemented");
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}
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private:
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void writeEscapedCString(const char * value)
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{
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while (const char * it = std::strpbrk(value, "'\\\""))
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{
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ostr.write(value, it - value);
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switch (*it)
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{
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case '"':
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ostr.write("\\\"", 2);
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break;
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case '\'':
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ostr.write("\\'", 2);
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break;
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case '\\':
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ostr.write("\\\\", 2);
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break;
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default:
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;
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}
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value = it + 1;
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}
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ostr << value;
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}
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void writeEscapedData(const char * data, size_t length)
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{
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size_t i = 0;
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while (true)
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{
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size_t remaining_length = std::strlen(data);
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writeEscapedCString(data);
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if (i + remaining_length == length)
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break;
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ostr.write("\\0", 2);
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i += remaining_length + 1;
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data += remaining_length + 1;
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}
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}
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};
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inline QuoteManipResult operator<< (std::ostream & ostr, quote_enum manip)
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{
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return QuoteManipResult(ostr);
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}
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/** Манипулятор istream, позволяет считывать значения из tab delimited файла.
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*/
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enum unescape_enum
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{
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unescape
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};
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/** Манипулятор istream, который позволяет читать значения в кавычках или без.
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*/
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enum unquote_enum
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{
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unquote
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};
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inline void parseEscapeSequence(std::istream & istr, std::string & value)
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{
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char c = istr.get();
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if (!istr.good())
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throw Poco::Exception("Cannot parse string: unexpected end of input.");
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switch(c)
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{
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case 'b':
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value.push_back('\b');
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break;
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case 'f':
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value.push_back('\f');
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break;
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case 'n':
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value.push_back('\n');
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break;
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case 'r':
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value.push_back('\r');
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break;
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case 't':
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value.push_back('\t');
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break;
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default:
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value.push_back(c);
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break;
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}
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}
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struct UnEscapeManipResult
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{
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std::istream & istr;
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UnEscapeManipResult(std::istream & istr_) : istr(istr_) {}
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std::istream & operator>> (bool & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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std::istream & operator>> (char & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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std::istream & operator>> (unsigned char & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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std::istream & operator>> (signed char & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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template <typename T>
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typename std::enable_if<std::is_arithmetic<T>::value, std::istream &>::type
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operator>> (T & value) { return istr >> value; }
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std::istream & operator>> (std::string & value)
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{
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value.clear();
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char c;
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while (1)
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{
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istr.get(c);
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if (!istr.good())
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break;
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switch (c)
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{
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case '\\':
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parseEscapeSequence(istr, value);
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break;
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case '\t':
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istr.unget();
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return istr;
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break;
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case '\n':
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istr.unget();
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return istr;
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break;
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default:
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value.push_back(c);
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break;
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}
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}
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return istr;
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}
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/// Чтение NULL-able типа.
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template <typename T>
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std::istream & operator>> (Null<T> & value)
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{
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char c;
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istr.get(c);
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if (c == '\\' && istr.peek() == 'N')
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{
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value.is_null = true;
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istr.ignore();
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}
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else
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{
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istr.unget();
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value.is_null = false;
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*this >> value.data;
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}
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return istr;
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}
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std::istream & operator>> (LocalDate & value)
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{
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std::string s;
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(*this) >> s;
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value = LocalDate(s);
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return istr;
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}
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std::istream & operator>> (LocalDateTime & value)
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{
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std::string s;
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(*this) >> s;
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value = LocalDateTime(s);
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return istr;
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}
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template <typename T>
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std::istream & operator>> (std::vector<T> & value)
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{
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throw Poco::Exception(std::string(__PRETTY_FUNCTION__) + " is not implemented");
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}
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};
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inline UnEscapeManipResult operator>> (std::istream & istr, unescape_enum manip)
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{
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return UnEscapeManipResult(istr);
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}
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struct UnQuoteManipResult
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{
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public:
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std::istream & istr;
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UnQuoteManipResult(std::istream & istr_) : istr(istr_) {}
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std::istream & operator>> (bool & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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std::istream & operator>> (char & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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std::istream & operator>> (unsigned char & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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std::istream & operator>> (signed char & value) { int tmp = 0; istr >> tmp; value = tmp; return istr; }
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template <typename T>
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typename std::enable_if<std::is_arithmetic<T>::value, std::istream &>::type
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operator>> (T & value) { return istr >> value; }
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std::istream & operator>> (std::string & value)
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{
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value.clear();
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readQuote();
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char c;
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while (1)
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{
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istr.get(c);
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if (!istr.good())
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break;
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switch (c)
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{
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case '\\':
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parseEscapeSequence(istr, value);
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break;
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case '\'':
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return istr;
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break;
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default:
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value.push_back(c);
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break;
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}
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}
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throw Poco::Exception("Cannot parse string: unexpected end of input.");
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}
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template <typename T>
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std::istream & operator>> (std::vector<T> & value)
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{
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throw Poco::Exception(std::string(__PRETTY_FUNCTION__) + " is not implemented");
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}
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private:
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void readQuote()
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{
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char c = istr.get();
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if (!istr.good())
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throw Poco::Exception("Cannot parse string: unexpected end of input.");
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if (c != '\'')
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throw Poco::Exception("Cannot parse string: missing opening single quote.");
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}
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};
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inline UnQuoteManipResult operator>> (std::istream & istr, unquote_enum manip)
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{
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return UnQuoteManipResult(istr);
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}
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}
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