240 lines
11 KiB
C++
240 lines
11 KiB
C++
#ifndef MATADOR_CONVERT_HPP
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#define MATADOR_CONVERT_HPP
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#include "matador/utils/types.hpp"
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#include "matador/utils/result.hpp"
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//#include "matador/utils/date.hpp"
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//#include "matador/utils/time.hpp"
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//#include "matador/utils/placeholder.hpp"
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#include <array>
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#include <charconv>
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#include <cstring>
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#include <limits>
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#include <stdexcept>
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#include <string>
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#include <type_traits>
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/*
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* Conversion matrix
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* from> | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | bool | float | double | string | date | time | blob | placeholder | null
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* to | | | | | | | | | | | | | | | | |
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* ------------+------+-------+-------+-------+-------+--------+--------+--------+------+-------+--------+--------+------+------+------+-------------+-----
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* int8 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* int16 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* int32 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* int64 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* uint8 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* uint16 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* uint32 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* uint64 | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | ok | ok | try | N/A | N/A
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* bool | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | N/A | N/A | try | N/A | N/A
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* float | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | N/A | N/A | try | N/A | N/A
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* double | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | try | N/A | N/A | try | N/A | N/A
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* string | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | N/A | N/A | N/A
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* date | ok | ok | ok | ok | ok | ok | ok | ok | N/A | N/A | N/A | try | ok | ok | N/A | N/A | N/A
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* time | ok | ok | ok | ok | ok | ok | ok | ok | N/A | N/A | N/A | try | ok | ok | N/A | N/A | N/A
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* blob | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | ok | N/A | N/A
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* placeholder | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ok | N/A
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* null | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | ok
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*
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* from integral to date/time works, value is interpreted as std::chrono::timepoint
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* from integral to blob works, bytes of integral data will converted to blob
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* from boolean to blob works, byte of bool data will converted to blob
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* from floating point to blob works, bytes of floating point data will converted to blob
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* from date to blob works, bytes of date will converted to blob
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* from time to blob works, bytes of time will converted to blob
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* from string to blob works, bytes of string data will converted to blob
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* from floating point to integral works, fractions are truncated
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* from date/time to integral works, value will be converted from std::chrono::timepoint
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* from blob to integral works, value will be converted missing is filled with zero, rest is omitted
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* from blob to floating point works, value will be converted missing is filled with zero, rest is omitted
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* from blob to boolean works, value will be converted missing is filled with zero, rest is omitted
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*/
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namespace matador::utils {
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enum class conversion_error {
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Ok,
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NotConvertable,
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MissingData
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};
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enum class conversion_policy {
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Strict,
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Relax
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};
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// template < typename DestType, typename SourceType >
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// result<DestType, conversion_error> to(const SourceType &/*from*/);
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// result<DestType, conversion_error> to(const SourceType &/*from*/, conversion_policy /*policy*/ = conversion_policy::Strict);
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// {
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// return failure(conversion_error::NotConvertable);
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// }
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/*
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* Integral, Floating point & bool conversion
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*/
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_arithmetic_v<DestType> && std::is_arithmetic_v<SourceType>>* = nullptr)
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{
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return ok(static_cast<DestType>(source));
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_same_v<std::string, DestType> && std::is_same_v<std::string, SourceType>>* = nullptr)
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{
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return ok(source);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_integral_v<SourceType> && !std::is_same_v<bool, SourceType> && std::is_same_v<DestType, std::string>>* = nullptr)
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{
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std::array<char, 128> buffer{};
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auto [ptr, ec] = std::to_chars(buffer.data(), buffer.data() + buffer.size(), source, 10);
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if (ec == std::errc{}) {
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return ok(std::string(buffer.data(), ptr));
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}
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// return failure({ec, "couldn't convert value to std::string"});
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return failure(conversion_error::NotConvertable/*, "couldn't convert value to std::string"}*/);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_floating_point_v<SourceType> && std::is_same_v<DestType, std::string>>* = nullptr)
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{
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std::array<char, 128> buffer{};
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auto [ptr, ec] = std::to_chars(buffer.data(), buffer.data() + buffer.size(), source, std::chars_format::general);
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if (ec == std::errc{}) {
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return ok(std::string(buffer.data(), ptr));
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}
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// return failure({ec, "couldn't convert value to std::string"});
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return failure(conversion_error::NotConvertable/*, "couldn't convert value to std::string"}*/);
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}
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template < typename DestType >
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result<DestType, conversion_error> to(const std::string &source, std::enable_if_t<std::is_integral_v<DestType> && std::is_signed_v<DestType>>* = nullptr)
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{
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if (source.empty()) {
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return failure(conversion_error::MissingData/*, "failed to convert empty string"}*/);
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}
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char *end;
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errno = 0;
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const auto result = strtoll(source.c_str(), &end, 10);
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if (errno == ERANGE) {
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return failure(conversion_error::NotConvertable/*, "failed to convert string value"}*/);
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}
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return ok(static_cast<DestType>(result));
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}
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template < typename DestType >
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result<DestType, conversion_error> to(const std::string &source, std::enable_if_t<std::is_integral_v<DestType> && std::is_unsigned_v<DestType>>* = nullptr)
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{
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if (source.empty()) {
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return failure(conversion_error::MissingData/*, "failed to convert empty string"}*/);
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}
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char *end;
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errno = 0;
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const auto result = strtoull(source.c_str(), &end, 10);
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if (errno == ERANGE) {
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return failure(conversion_error::NotConvertable/*, "failed to convert string value"}*/);
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}
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return ok(static_cast<DestType>(result));
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}
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template < typename DestType >
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result<DestType, conversion_error> to(const std::string &source, std::enable_if_t<std::is_floating_point_v<DestType>>* = nullptr)
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{
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if (source.empty()) {
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return failure(conversion_error::MissingData/*, "failed to convert empty string"}*/);
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}
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char *end;
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errno = 0;
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const auto result = strtod(source.c_str(), &end);
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if (errno == ERANGE) {
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return failure(conversion_error::NotConvertable/*, "failed to convert string value"}*/);
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}
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return ok(static_cast<DestType>(result));
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}
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template < typename DestType >
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result<DestType, conversion_error> to(const blob &source, std::enable_if_t<std::is_same_v<DestType, blob>>* = nullptr) {
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return ok(source);
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}
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static std::unordered_map<std::string, bool> string_to_bool_map = {
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{"true", true},
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{"on", true},
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{"1", true},
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{"false", false},
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{"off", false},
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{"0", false}
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};
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_same_v<SourceType, std::string> &&std::is_same_v<DestType, bool>>* = nullptr) {
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if (source.empty()) {
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return failure(conversion_error::MissingData);
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}
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const auto it = string_to_bool_map.find(source);
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if (it == string_to_bool_map.end()) {
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return failure(conversion_error::NotConvertable);
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}
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return ok(it->second);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_same_v<SourceType, bool> &&std::is_same_v<DestType, std::string>>* = nullptr) {
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return ok(std::string(source ? "true" : "false"));
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &/*source*/, std::enable_if_t<std::is_same_v<SourceType, blob> &&std::is_same_v<DestType, std::string>>* = nullptr) {
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return failure(conversion_error::NotConvertable);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_same_v<SourceType, const char*> &&std::is_same_v<DestType, std::string>>* = nullptr) {
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return ok(std::string(source));
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &/*source*/, std::enable_if_t<std::is_arithmetic_v<DestType> && std::is_same_v<SourceType, blob>>* = nullptr) {
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return failure(conversion_error::NotConvertable);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &source, std::enable_if_t<std::is_integral_v<SourceType> && std::is_same_v<DestType, blob>>* = nullptr) {
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DestType result;
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result.resize(sizeof(source));
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std::memcpy(result.data(), &source, sizeof(source));
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return ok(result);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &/*source*/, std::enable_if_t<std::is_floating_point_v<SourceType> && std::is_same_v<DestType, blob>>* = nullptr) {
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return failure(conversion_error::NotConvertable);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &/*source*/, std::enable_if_t<std::is_same_v<SourceType, std::string> && std::is_same_v<DestType, blob>>* = nullptr) {
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return failure(conversion_error::NotConvertable);
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}
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template < typename DestType, typename SourceType >
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result<DestType, conversion_error> to(const SourceType &/*source*/, std::enable_if_t<std::is_same_v<SourceType, const char*> && std::is_same_v<DestType, blob>>* = nullptr) {
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return failure(conversion_error::NotConvertable);
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}
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}
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#endif //MATADOR_CONVERT_HPP
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