From fb0ae4a2b8cd9502fa58359ddd3bc0d42465c64f Mon Sep 17 00:00:00 2001
From: Peter Csajtai <peter.csajtai@outlook.com>
Date: Sun, 28 Jul 2024 14:47:37 +0200
Subject: [PATCH] Another approach for modules

---
 CMakeLists.txt            |  2 +-
 include/semver/semver.hpp | 20 +++++++++++-----
 module/semver.cppm        | 48 +++++++++++++++++++++++++++++----------
 3 files changed, 51 insertions(+), 19 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51d7914..6ed93e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ endif()
 
 option(SEMVER_BUILD_TESTS "Enable builds of tests" ${TOP_PROJECT})
 option(SEMVER_INSTALL "Enable install target" ${TOP_PROJECT})
-option(SEMVER_BUILD_MODULE "Build as C++20 module" OFF)
+option(SEMVER_BUILD_MODULE "Build as C++20 module" ON)
 
 if (SEMVER_BUILD_MODULE)
     cmake_minimum_required(VERSION 3.28)
diff --git a/include/semver/semver.hpp b/include/semver/semver.hpp
index 961d1f9..196e9a1 100644
--- a/include/semver/semver.hpp
+++ b/include/semver/semver.hpp
@@ -25,6 +25,7 @@ SOFTWARE.
 #ifndef Z4KN4FEIN_SEMVER_H
 #define Z4KN4FEIN_SEMVER_H
 
+#ifndef SEMVER_MODULE
 #include <ostream>
 #include <string>
 #include <regex>
@@ -38,6 +39,13 @@ SOFTWARE.
 #include <string_view>
 #endif
 #endif
+#endif
+
+#ifdef SEMVER_MODULE
+#define SEMVER_EXPORT export
+#else
+#define SEMVER_EXPORT
+#endif
 
 namespace semver
 {
@@ -51,7 +59,7 @@ namespace semver
                                               "?(?:-((?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\\.(?:0|[1-9]\\d*|\\d*[a-zA-Z-][0-9a-zA-Z-]*))*))"
                                               "?(?:\\+([0-9a-zA-Z-]+(?:\\.[0-9a-zA-Z-]+)*))?$";
 
-    struct semver_exception : public std::runtime_error {
+    SEMVER_EXPORT struct semver_exception : public std::runtime_error {
         explicit semver_exception(const std::string& message) : std::runtime_error(message) { }
     };
 
@@ -211,9 +219,9 @@ namespace semver
         }
     };
 
-    enum inc { major, minor, patch, prerelease };
+    SEMVER_EXPORT enum inc { major, minor, patch, prerelease };
 
-    class version {
+    SEMVER_EXPORT class version {
     private:
         uint64_t m_major;
         uint64_t m_minor;
@@ -374,18 +382,18 @@ namespace semver
         }
     };
 
-    inline std::ostream & operator<<(std::ostream& str, const version& version) {
+    SEMVER_EXPORT inline std::ostream & operator<<(std::ostream& str, const version& version) {
         for (const auto s : version.str()) str.put(s);
         return str;
     }
 
     namespace literals
     {
-        inline version operator""_v(const char* text, std::size_t length) {
+        SEMVER_EXPORT inline version operator""_v(const char* text, std::size_t length) {
             return version::parse(std::string(text, length));
         }
 
-        inline version operator""_lv(const char* text, std::size_t length) {
+        SEMVER_EXPORT inline version operator""_lv(const char* text, std::size_t length) {
             return version::parse(std::string(text, length), false);
         }
     }
diff --git a/module/semver.cppm b/module/semver.cppm
index 11c728a..8c21caa 100644
--- a/module/semver.cppm
+++ b/module/semver.cppm
@@ -24,18 +24,42 @@ SOFTWARE.
 
 module;
 
-#include <semver/semver.hpp>
+#include <ostream>
+#include <string>
+#include <regex>
+#include <utility>
+#include <vector>
+
+// conditionally include <format> and its dependency <string_view> for C++20
+#ifdef __cpp_lib_format
+#if __cpp_lib_format >= 201907L
+#include <format>
+#include <string_view>
+#endif
+#endif
 
 export module semver;
 
-export namespace semver {
-    using semver::version;
-    using semver::inc;
-    using semver::semver_exception;
-    using semver::operator<<;
-}
-
-export namespace semver::literals {
-    using semver::literals::operator""_v;
-    using semver::literals::operator""_lv;
-}
\ No newline at end of file
+#define SEMVER_MODULE
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 5244)
+#endif
+
+#ifdef __clang__
+#pragma clang diagnostic push
+#if __has_warning("-Winclude-angled-in-module-purview")
+#pragma clang diagnostic ignored "-Winclude-angled-in-module-purview"
+#endif
+#endif
+
+#include <semver/semver.hpp>
+
+#ifdef __clang__
+#pragma clang diagnostic pop
+#endif
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
\ No newline at end of file