refactor: finish Windows encoding namespace.
- finish Windows encoding namespace. - add std::expected polyfill for help.
This commit is contained in:
@ -1,8 +1,8 @@
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#include "utf.hpp"
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#include "../macro/feature_probe.hpp"
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#include <locale>
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#define NS_YYCC_STRING ::yycc::string
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#define NS_YYCC_PATCH_EXPECTED ::yycc::patch::expected
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namespace yycc::encoding::utf {
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@ -125,14 +125,13 @@ namespace yycc::encoding::utf {
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#pragma region Help Macros
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#define CONVFN_TYPE1(fct_name, src_char_type, dst_char_type) \
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namespace expected = NS_YYCC_PATCH_EXPECTED; \
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auto rv = priv_##fct_name(src); \
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if (const auto* ptr = std::get_if<std::basic_string<dst_char_type>>(&rv)) { \
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dst = std::move(*ptr); \
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if (expected::is_value(rv)) { \
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dst = std::move(expected::get_value(rv)); \
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return true; \
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} else if (const auto* ptr = std::get_if<ConvError>(&rv)) { \
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return false; \
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} else { \
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throw std::runtime_error("unreachable code"); \
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return false; \
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}
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#define CONVFN_TYPE2(fct_name, src_char_type, dst_char_type) \
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@ -1,9 +1,9 @@
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#pragma once
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#include <yycc/string.hpp>
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#include <type_traits>
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#include <variant>
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#include "../string.hpp"
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#include "../patch/expected.hpp"
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#define NS_YYCC_STRING ::yycc::string
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#define NS_YYCC_PATCH_EXPECTED ::yycc::patch::expected
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namespace yycc::encoding::utf {
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@ -11,8 +11,8 @@ namespace yycc::encoding::utf {
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struct ConvError {};
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/// @private
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template<typename T, std::enable_if_t<!std::is_same_v<T, ConvError>, int> = 0>
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using ConvResult = std::variant<T, ConvError>;
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template<typename T>
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using ConvResult = NS_YYCC_PATCH_EXPECTED::Expected<T, ConvError>;
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// UTF8 -> UTF16
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@ -40,4 +40,5 @@ namespace yycc::encoding::utf {
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}
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#undef NS_YYCC_PATCH_EXPECTED
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#undef NS_YYCC_STRING
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@ -0,0 +1,252 @@
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#include "windows.hpp"
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#if YYCC_OS == YYCC_OS_WINDOWS
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#include "../string/reinterpret.hpp"
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#include <limits>
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#include <stdexcept>
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#include "../windows/import_guard_head.hpp"
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#include "../windows/import_guard_tail.hpp"
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#include <Windows.h>
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#define NS_YYCC_STRING ::yycc::string
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#define NS_YYCC_STRING_REINTERPRET ::yycc::string::reinterpret
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#define NS_YYCC_PATCH_EXPECTED ::yycc::patch::expected
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namespace yycc::encoding::windows {
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#pragma region Help Macros
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#define CONVFN_TYPE1(fct_name, src_char_type, dst_char_type, ...) \
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namespace expected = NS_YYCC_PATCH_EXPECTED; \
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auto rv = priv_##fct_name(src, ##__VA_ARGS__); \
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if (expected::is_value(rv)) { \
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dst = std::move(expected::get_value(rv)); \
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return true; \
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} else { \
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return false; \
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}
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#define CONVFN_TYPE2(fct_name, src_char_type, dst_char_type, ...) \
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std::basic_string<dst_char_type> rv; \
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if (fct_name(src, rv, ##__VA_ARGS__)) return rv; \
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else throw std::runtime_error("fail to convert string in Win32 function");
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#pragma endregion
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#pragma region WChar -> Char
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ConvResult<std::string> priv_to_char(const std::wstring_view& src, CodePage code_page) {
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// prepare result
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std::string dst;
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// if src is empty, direct output
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if (src.empty()) {
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return dst;
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}
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// init WideCharToMultiByte used variables
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// setup src pointer
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LPCWCH lpWideCharStr = reinterpret_cast<LPCWCH>(src.data());
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// check whether source string is too large.
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size_t cSrcSize = src.size();
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if (cSrcSize > std::numeric_limits<int>::max()) return ConvError::TooLargeLength;
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int cchWideChar = static_cast<int>(src.size());
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// do convertion
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// do a dry-run first to fetch desired size.
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int desired_size
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= WideCharToMultiByte(code_page, 0, lpWideCharStr, cchWideChar, NULL, 0, NULL, NULL);
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if (desired_size <= 0) return ConvError::NoDesiredSize;
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// resize dest for receiving result
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dst.resize(static_cast<size_t>(desired_size));
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// do real convertion
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int write_result = WideCharToMultiByte(code_page,
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0,
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lpWideCharStr,
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cchWideChar,
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reinterpret_cast<LPSTR>(dst.data()),
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desired_size,
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NULL,
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NULL);
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if (write_result <= 0) return ConvError::BadWrittenSize;
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return dst;
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}
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bool to_char(const std::wstring_view& src, std::string& dst, CodePage code_page) {
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CONVFN_TYPE1(to_char, wchar_t, char, code_page);
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}
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std::string to_char(const std::wstring_view& src, CodePage code_page) {
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CONVFN_TYPE2(to_char, wchar_t, char, code_page);
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}
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#pragma endregion
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#pragma region Char -> WChar
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ConvResult<std::wstring> priv_to_wchar(const std::string_view& src, CodePage code_page) {
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// prepare result
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std::wstring dst;
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// if src is empty, direct output
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if (src.empty()) {
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return dst;
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}
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// init WideCharToMultiByte used variables
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// setup src pointer
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LPCCH lpMultiByteStr = reinterpret_cast<LPCCH>(src.data());
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// check whether source string is too large.
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size_t cSrcSize = src.size();
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if (cSrcSize > std::numeric_limits<int>::max()) return ConvError::TooLargeLength;
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int cbMultiByte = static_cast<int>(src.size());
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// do convertion
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// do a dry-run first to fetch desired size.
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int desired_size = MultiByteToWideChar(code_page, 0, lpMultiByteStr, cbMultiByte, NULL, 0);
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if (desired_size <= 0) return ConvError::NoDesiredSize;
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// resize dest for receiving result
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dst.resize(static_cast<size_t>(desired_size));
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// do real convertion
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int write_result = MultiByteToWideChar(code_page,
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0,
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lpMultiByteStr,
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cbMultiByte,
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reinterpret_cast<LPWSTR>(dst.data()),
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desired_size);
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if (write_result <= 0) return ConvError::BadWrittenSize;
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return dst;
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}
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bool to_wchar(const std::string_view& src, std::wstring& dst, CodePage code_page) {
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CONVFN_TYPE1(to_wchar, char, wchar_t, code_page);
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}
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std::wstring to_wchar(const std::string_view& src, CodePage code_page) {
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CONVFN_TYPE2(to_wchar, char, wchar_t, code_page);
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}
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#pragma endregion
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#pragma region Char -> Char
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ConvResult<std::string> priv_to_char(const std::string_view& src,
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CodePage src_code_page,
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CodePage dst_code_page) {
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namespace expected = NS_YYCC_PATCH_EXPECTED;
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// Perform first convertion
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auto first_rv = priv_to_wchar(src, src_code_page);
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if (expected::is_error(first_rv)) {
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return expected::get_error(first_rv);
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}
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// Perform second convertion
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auto second_rv = to_char(std::get<std::wstring>(first_rv), dst_code_page);
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return second_rv;
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}
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bool to_char(const std::string_view& src,
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std::string& dst,
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CodePage src_code_page,
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CodePage dst_code_page) {
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CONVFN_TYPE1(to_char, char, char, src_code_page, dst_code_page);
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}
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std::string to_char(const std::string_view& src,
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CodePage src_code_page,
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CodePage dst_code_page) {
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CONVFN_TYPE2(to_char, char, char, src_code_page, dst_code_page);
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}
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#pragma endregion
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#pragma region WChar -> UTF8
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ConvResult<NS_YYCC_STRING::u8string> priv_to_utf8(const std::wstring_view& src) {
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namespace expected = NS_YYCC_PATCH_EXPECTED;
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auto rv = priv_to_char(src, CP_UTF8);
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if (expected::is_value(rv)) {
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return NS_YYCC_STRING_REINTERPRET::as_utf8(expected::get_value(rv));
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} else {
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return expected::get_error(rv);
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}
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}
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bool to_utf8(const std::wstring_view& src, NS_YYCC_STRING::u8string& dst) {
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CONVFN_TYPE1(to_utf8, wchar_t, NS_YYCC_STRING::u8char);
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}
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NS_YYCC_STRING::u8string to_utf8(const std::wstring_view& src) {
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CONVFN_TYPE2(to_utf8, wchar_t, NS_YYCC_STRING::u8char);
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}
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#pragma endregion
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#pragma region UTF8 -> WChar
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ConvResult<std::wstring> priv_to_wchar(const NS_YYCC_STRING::u8string_view& src) {
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return priv_to_wchar(NS_YYCC_STRING_REINTERPRET::as_ordinary_view(src), CP_UTF8);
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}
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bool to_wchar(const NS_YYCC_STRING::u8string_view& src, std::wstring& dst) {
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CONVFN_TYPE1(to_wchar, NS_YYCC_STRING::u8char, wchar_t);
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}
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std::wstring to_wchar(const NS_YYCC_STRING::u8string_view& src) {
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CONVFN_TYPE2(to_wchar, NS_YYCC_STRING::u8char, wchar_t);
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}
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#pragma endregion
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#pragma region Char -> UTF8
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ConvResult<NS_YYCC_STRING::u8string> priv_to_utf8(const std::string_view& src,
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CodePage code_page) {
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namespace expected = NS_YYCC_PATCH_EXPECTED;
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auto rv = priv_to_char(src, code_page, CP_UTF8);
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if (expected::is_value(rv)) {
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return NS_YYCC_STRING_REINTERPRET::as_utf8(expected::get_value(rv));
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} else {
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return expected::get_error(rv);
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}
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}
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bool to_utf8(const std::string_view& src, NS_YYCC_STRING::u8string& dst, CodePage code_page) {
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CONVFN_TYPE1(to_utf8, char, NS_YYCC_STRING::u8char, code_page);
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}
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NS_YYCC_STRING::u8string to_utf8(const std::string_view& src, CodePage code_page) {
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CONVFN_TYPE2(to_utf8, char, NS_YYCC_STRING::u8char, code_page);
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}
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#pragma endregion
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#pragma region UTF8 -> Char
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ConvResult<std::string> priv_to_char(const NS_YYCC_STRING::u8string_view& src,
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CodePage code_page) {
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return priv_to_char(NS_YYCC_STRING_REINTERPRET::as_ordinary_view(src), CP_UTF8, code_page);
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}
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bool to_char(const NS_YYCC_STRING::u8string_view& src, std::string& dst, CodePage code_page) {
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CONVFN_TYPE1(to_char, NS_YYCC_STRING::u8char, char, code_page);
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}
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std::string to_char(const NS_YYCC_STRING::u8string_view& src, CodePage code_page) {
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CONVFN_TYPE2(to_char, NS_YYCC_STRING::u8char, char, code_page);
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}
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#pragma endregion
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#undef CONVFN_TYPE1
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#undef CONVFN_TYPE2
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#undef CONVFCT_TYPE4
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} // namespace yycc::encoding::windows
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#endif
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@ -0,0 +1,80 @@
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#pragma once
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#include "../macro/os_detector.hpp"
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#include "../string.hpp"
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#include "../patch/expected.hpp"
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#include <cstdint>
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#define NS_YYCC_STRING ::yycc::string
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#define NS_YYCC_PATCH_EXPECTED ::yycc::patch::expected
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namespace yycc::encoding::windows {
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#if YYCC_OS == YYCC_OS_WINDOWS
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using CodePage = uint32_t;
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/// @private
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enum class ConvError {
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TooLargeLength, ///< The length of given string is too large exceeding the maximum capacity of Win32 function.
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NoDesiredSize, ///< Can not compute the desired size of result string.
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BadWrittenSize, ///< The size of written data is not matched with expected size.
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};
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/// @private
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template<typename T>
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using ConvResult = NS_YYCC_PATCH_EXPECTED::Expected<T, ConvError>;
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// WChar -> Char
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ConvResult<std::string> priv_to_char(const std::wstring_view& src, CodePage code_page);
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bool to_char(const std::wstring_view& src, std::string& dst, CodePage code_page);
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std::string to_char(const std::wstring_view& src, CodePage code_page);
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// Char -> WChar
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ConvResult<std::wstring> priv_to_wchar(const std::string_view& src, CodePage code_page);
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bool to_wchar(const std::string_view& src, std::wstring& dst, CodePage code_page);
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std::wstring to_wchar(const std::string_view& src, CodePage code_page);
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// YYC MARK:
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// Following functions are basically the alias of above functions.
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// Char -> Char
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ConvResult<std::string> priv_to_char(const std::string_view& src,
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CodePage src_code_page,
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CodePage dst_code_page);
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bool to_char(const std::string_view& src,
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std::string& dst,
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CodePage src_code_page,
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CodePage dst_code_page);
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std::string to_char(const std::string_view& src, CodePage src_code_page, CodePage dst_code_page);
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// YYC MARK:
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// Following functions are basically the specialized UTF8 functions.
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// WChar -> UTF8
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ConvResult<NS_YYCC_STRING::u8string> priv_to_utf8(const std::wstring_view& src);
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bool to_utf8(const std::wstring_view& src, NS_YYCC_STRING::u8string& dst);
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NS_YYCC_STRING::u8string to_utf8(const std::wstring_view& src);
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// UTF8 -> WChar
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ConvResult<std::wstring> priv_to_wchar(const NS_YYCC_STRING::u8string_view& src);
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bool to_wchar(const NS_YYCC_STRING::u8string_view& src, std::wstring& dst);
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std::wstring to_wchar(const NS_YYCC_STRING::u8string_view& src);
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// Char -> UTF8
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ConvResult<NS_YYCC_STRING::u8string> priv_to_utf8(const std::string_view& src,
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CodePage code_page);
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bool to_utf8(const std::string_view& src, NS_YYCC_STRING::u8string& dst, CodePage code_page);
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NS_YYCC_STRING::u8string to_utf8(const std::string_view& src, CodePage code_page);
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// UTF8 -> Char
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ConvResult<std::string> priv_to_char(const NS_YYCC_STRING::u8string_view& src,
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CodePage code_page);
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bool to_char(const NS_YYCC_STRING::u8string_view& src, std::string& dst, CodePage code_page);
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std::string to_char(const NS_YYCC_STRING::u8string_view& src, CodePage code_page);
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#endif
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} // namespace yycc::encoding::windows
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#undef NS_YYCC_PATCH_EXPECTED
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#undef NS_YYCC_STRING
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