feat: add various detector.

- add endian and compiler detector, and modify os detector.
- now we use CMake to add detector-used macro, instead of using some C++ features to detect them.
- change Windows environment detection according to the change of os detector.

src/yycc/encoding/iconv.cpp

@@ -1,8 +1,9 @@
 #include "iconv.hpp"
 
-#if YYCC_FEAT_ICONV || (YYCC_OS != YYCC_OS_WINDOWS)
+#if YYCC_FEAT_ICONV || !defined(YYCC_OS_WINDOWS)
 
 #include "../string/reinterpret.hpp"
+#include "../macro/endian_detector.hpp"
 #include <cerrno>
 #include <stdexcept>
 #include <cstdint>
@@ -190,20 +191,30 @@ namespace yycc::encoding::iconv {
     // That's not what we expected.
     // So we need manually check runtime endian and explicitly specify endian in code name.
 
-    // TODO: fix this encoding endian issue.
-
     static const NS_YYCC_STRING::u8char* UTF8_CODENAME_LITERAL = YYCC_U8("UTF-8");
     static const NS_YYCC_STRING::u8char* WCHAR_CODENAME_LITERAL = YYCC_U8("WCHAR_T");
     static const NS_YYCC_STRING::u8char* fetch_utf16_codename() {
-        return YYCC_U8("UTF16");
+#if defined(YYCC_ENDIAN_LITTLE)
+        return YYCC_U8("UTF16LE");
+#else
+        return YYCC_U8("UTF16BE");
+#endif
     }
     static const NS_YYCC_STRING::u8char* UTF16_CODENAME_LITERAL = fetch_utf16_codename();
     static const NS_YYCC_STRING::u8char* fetch_utf32_codename() {
-        return YYCC_U8("UTF32");
+#if defined(YYCC_ENDIAN_LITTLE)
+        return YYCC_U8("UTF32LE");
+#else
+        return YYCC_U8("UTF32BE");
+#endif
     }
     static const NS_YYCC_STRING::u8char* UTF32_CODENAME_LITERAL = fetch_utf32_codename();
 
-    // TODO: There is a memory copy in this function. Consider removing it in future.
+    // TODO:
+    // There is a memory copy in this function. Consider optimizing it in future.
+    // A possible solution is that create a std::vector-like wrapper for std::basic_string and std::basic_string_view.
+    // We call them VecString and VecStringView, and use them in "iconv_kernel" instead of real std::vector.
+    // They exposed interface are std::vector-like but its inner is std::basic_string and std::basic_string_view.
 #define CONVFN_TYPE0(src_char_type, dst_char_type) \
     namespace expected = NS_YYCC_PATCH_EXPECTED; \
     auto rv = iconv_kernel(this->token, reinterpret_cast<const uint8_t*>(src.data()), src.size()); \

src/yycc/encoding/iconv.hpp

@@ -1,7 +1,7 @@
 #pragma once
 #include "../macro/os_detector.hpp"
 
-#if YYCC_FEAT_ICONV || (YYCC_OS != YYCC_OS_WINDOWS)
+#if YYCC_FEAT_ICONV || !defined(YYCC_OS_WINDOWS)
 
 #include "../macro/class_copy_move.hpp"
 #include "../patch/expected.hpp"

src/yycc/encoding/windows.cpp

@@ -1,6 +1,6 @@
 #include "windows.hpp"
 
-#if YYCC_OS == YYCC_OS_WINDOWS
+#if defined(YYCC_OS_WINDOWS)
 
 #include "../string/reinterpret.hpp"
 #include <limits>

src/yycc/encoding/windows.hpp

@@ -1,7 +1,7 @@
 #pragma once
 #include "../macro/os_detector.hpp"
 
-#if YYCC_OS == YYCC_OS_WINDOWS
+#if defined(YYCC_OS_WINDOWS)
 
 #include "../patch/expected.hpp"
 #include "../string.hpp"

src/yycc/macro/compiler_detector.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+#if (defined(YYCC_CC_MSVC) + defined(YYCC_CC_GCC) + defined(YYCC_CC_CLANG)) != 1
+#error "Current compiler is not supported!"
+#endif

src/yycc/macro/endian_detector.hpp

@@ -0,0 +1,7 @@
+#pragma once
+
+// Check endian
+#if (defined(YYCC_ENDIAN_LITTLE) + defined(YYCC_ENDIAN_BIG)) != 1
+#error "Current system endian (byte order) is not supported!"
+#endif
+

src/yycc/macro/os_detector.hpp

@@ -1,11 +1,6 @@
 #pragma once
 
-// Define operating system macros
-#define YYCC_OS_WINDOWS 2
-#define YYCC_OS_LINUX 3
-// Check current operating system.
-#if defined(_WIN32)
-#define YYCC_OS YYCC_OS_WINDOWS
-#else
-#define YYCC_OS YYCC_OS_LINUX
+// Check OS macro
+#if (defined(YYCC_OS_WINDOWS) + defined(YYCC_OS_LINUX)) != 1
+#error "Current operating system is not supported!"
 #endif

src/yycc/patch/path.cpp

@@ -12,7 +12,7 @@ namespace yycc::patch::path {
     // So we need add feature test macro at the same time.
 
     std::filesystem::path to_std_path(const NS_YYCC_STRING::u8string_view& u8_path) {
-// #if YYCC_OS == YYCC_OS_WINDOWS
+// #if defined(YYCC_OS_WINDOWS)
 
 //         // convert path to wchar
 //         std::wstring wpath;
@@ -29,7 +29,7 @@ namespace yycc::patch::path {
     }
 
     NS_YYCC_STRING::u8string to_u8string(const std::filesystem::path& path) {
-// #if YYCC_OS == YYCC_OS_WINDOWS
+// #if defined(YYCC_OS_WINDOWS)
 
 //         // get and convert to utf8
 //         NS_YYCC_STRING::u8string u8_path;

src/yycc/prelude/core.hpp

@@ -1,5 +1,8 @@
 #pragma once
 
+// Suppress unsafe warning on Windows
+#include "../windows/unsafe_suppressor.hpp"
+
 // Prelude section
 #include "../string.hpp"
 namespace yycc::prelude {

src/yycc/windows/import_guard_head.hpp

@@ -4,7 +4,7 @@
 
 #include "../macro/os_detector.hpp"
 
-#if YYCC_OS == YYCC_OS_WINDOWS
+#if defined(YYCC_OS_WINDOWS)
 
 // Define 2 macros to disallow Windows generate MIN and MAX macros
 // which cause std::min and std::max can not function as normal.

src/yycc/windows/import_guard_tail.hpp

@@ -4,7 +4,7 @@
 
 #include "../macro/os_detector.hpp"
 
-#if YYCC_OS == YYCC_OS_WINDOWS
+#if defined(YYCC_OS_WINDOWS)
 
 // Windows also will generate following macros
 // which may cause the function sign is different in Windows and other platforms.

src/yycc/windows/unsafe_suppressor.hpp

@@ -4,7 +4,7 @@
 // If we are in Windows,
 // we need add 2 macros to disable Windows shitty warnings and errors of
 // depracted functions and not secure functions.
-#if YYCC_OS == YYCC_OS_WINDOWS
+#if defined(YYCC_OS_WINDOWS)
 
 #if !defined(_CRT_SECURE_NO_WARNINGS)
 #define _CRT_SECURE_NO_WARNINGS