dragonbox: add package (#4143)

packages/d/dragonbox/xmake.lua

@@ -0,0 +1,44 @@
+package("dragonbox")
+    set_homepage("https://github.com/jk-jeon/dragonbox")
+    set_description("Reference implementation of Dragonbox in C++")
+    set_license("Apache-2.0")
+
+    add_urls("https://github.com/jk-jeon/dragonbox/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/jk-jeon/dragonbox.git")
+
+    add_versions("1.1.3", "09d63b05e9c594ec423778ab59b7a5aa1d76fdd71d25c7048b0258c4ec9c3384")
+
+    if is_plat("windows") then
+        add_configs("shared", {description = "Build shared library.", default = false, type = "boolean", readonly = true})
+    end
+
+    add_deps("cmake")
+
+    on_install(function (package)
+        io.replace("CMakeLists.txt", "STATIC", "", {plain = true})
+        io.replace("CMakeLists.txt", [[set(dragonbox_directory "dragonbox-${PROJECT_VERSION}")]], "set(dragonbox_directory )", {plain = true})
+
+        local configs = {"-DDRAGONBOX_INSTALL_TO_CHARS=ON"}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:is_debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        if package:is_plat("windows") then
+            table.insert(configs, "-DCMAKE_COMPILE_PDB_OUTPUT_DIRECTORY=''")
+            if package:config("shared") then
+                table.insert(configs, "-DCMAKE_WINDOWS_EXPORT_ALL_SYMBOLS=ON")
+            end
+        end
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            void test() {
+                constexpr int buffer_length = 1 + // for '\0'
+                    jkj::dragonbox::max_output_string_length<jkj::dragonbox::ieee754_binary64>;
+                double x = 1.234;
+                char buffer[buffer_length];
+                char* end_ptr = jkj::dragonbox::to_chars(x, buffer);
+                end_ptr = jkj::dragonbox::to_chars_n(x, buffer);
+            }
+        ]]}, {configs = {languages = "c++17"}, includes = "dragonbox/dragonbox_to_chars.h"}))
+    end)