Add native NSSpellCheck and WinSpellCheck spellchecking support

indra/CMakeLists.txt

@@ -76,6 +76,10 @@ else ()
   option(USE_SDL_WINDOW "Build with SDL based window management and input (experimental on Windows)" OFF)
 endif ()
 
+# Spell checking backend
+cmake_dependent_option(USE_NSSPELLCHECKER "Use the native macOS NSSpellChecker instead of Hunspell" ON "APPLE" OFF)
+cmake_dependent_option(USE_WINSPELLCHECK "Use the native Windows Spell Checking API instead of Hunspell" ON "WIN32" OFF)
+
 # Configure crash reporting
 option(RELEASE_CRASH_REPORTING "Enable use of crash reporting in release builds" OFF)
 option(NON_RELEASE_CRASH_REPORTING "Enable use of crash reporting in developer builds" OFF)
@@ -181,6 +185,10 @@ if(BUILD_DULLAHAN_EXAMPLE)
   list(APPEND VCPKG_MANIFEST_FEATURES "dullahan-example")
 endif()
 
+if (NOT USE_NSSPELLCHECKER AND NOT USE_WINSPELLCHECK)
+  list(APPEND VCPKG_MANIFEST_FEATURES "hunspell")
+endif()
+
 # Export compile_commands.json for ninja and makefile generators
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
@@ -275,6 +283,7 @@ include(Mesa)
 include(Meshoptimizer)
 include(Mikktspace)
 include(NDOF)
+include(NSSpellChecker)
 include(NVAPI)
 include(OpenAL)
 include(OpenGL)
@@ -297,6 +306,7 @@ include(Vorbis)
 include(WebP)
 include(WebRTC)
 include(websocketpp)
+include(WinSpellCheck)
 include(xxHash)
 include(ZLIBNG)
 

indra/cmake/Copy3rdPartyLibs.cmake

@@ -88,9 +88,13 @@ if(WINDOWS)
     endif()
 elseif(DARWIN)
     set(vcpkg_lib_dir "${_VCPKG_INSTALLED_DIR}/${VCPKG_TARGET_TRIPLET}/lib")
-    set(release_libs
-    "libhunspell-1.7.0.dylib"
-    )
+    if (USE_NSSPELLCHECKER)
+        set(release_libs "")
+    else()
+        set(release_libs
+        "libhunspell-1.7.0.dylib"
+        )
+    endif()
 elseif(LINUX)
     set(vcpkg_lib_dir "${_VCPKG_INSTALLED_DIR}/${VCPKG_TARGET_TRIPLET}/lib")
     set(release_libs "")

indra/cmake/Hunspell.cmake

@@ -3,7 +3,9 @@ include_guard()
 
 add_library(ll::hunspell INTERFACE IMPORTED)
 
-find_package(PkgConfig REQUIRED)
+if (NOT USE_NSSPELLCHECKER AND NOT USE_WINSPELLCHECK)
+    find_package(PkgConfig REQUIRED)
 
-pkg_check_modules(hunspell REQUIRED IMPORTED_TARGET GLOBAL hunspell)
-target_link_libraries(ll::hunspell INTERFACE PkgConfig::hunspell)
+    pkg_check_modules(hunspell REQUIRED IMPORTED_TARGET GLOBAL hunspell)
+    target_link_libraries(ll::hunspell INTERFACE PkgConfig::hunspell)
+endif()

indra/cmake/NSSpellChecker.cmake

@@ -0,0 +1,11 @@
+# -*- cmake -*-
+
+include_guard()
+
+if (USE_NSSPELLCHECKER)
+  # Link target for the macOS NSSpellChecker engine (llspellcheckengine_mac.mm). No compile
+  # definitions are needed: the engine is selected by which source CMake compiles, and the shared
+  # llspellcheck.h is platform-clean (it only forward-declares the abstract LLSpellCheckEngine).
+  add_library(ll::nsspellchecker INTERFACE IMPORTED)
+  target_link_libraries(ll::nsspellchecker INTERFACE "-framework AppKit" "-framework Foundation")
+endif ()

indra/cmake/WinSpellCheck.cmake

@@ -0,0 +1,13 @@
+# -*- cmake -*-
+
+include_guard()
+
+if (USE_WINSPELLCHECK)
+  # Link target for the Windows Spell Checking engine (llspellcheckengine_win32.cpp). ole32 provides
+  # CoInitializeEx/CoCreateInstance/CoTaskMemFree/CoUninitialize; <spellcheck.h> ships with the
+  # Windows SDK and the API uses LPCWSTR (not BSTR), so no oleaut32/uuid.lib is required. No compile
+  # definitions are needed: the engine is selected by which source CMake compiles, and the shared
+  # llspellcheck.h is platform-clean (it only forward-declares the abstract LLSpellCheckEngine).
+  add_library(ll::winspellcheck INTERFACE IMPORTED)
+  target_link_libraries(ll::winspellcheck INTERFACE ole32)
+endif ()

indra/llui/CMakeLists.txt

@@ -70,7 +70,6 @@ target_sources(llui
     llsearcheditor.cpp
     llslider.cpp
     llsliderctrl.cpp
-    llspellcheck.cpp
     llspinctrl.cpp
     llstatbar.cpp
     llstatgraph.cpp
@@ -190,6 +189,7 @@ target_sources(llui
     llsliderctrl.h
     llslider.h
     llspellcheck.h
+    llspellcheckengine.h
     llspellcheckmenuhandler.h
     llspinctrl.h
     llstatbar.h
@@ -234,6 +234,20 @@ target_sources(llui
     llxyvector.h
     )
 
+# Spell checking: the backend-agnostic LLSpellChecker core (llspellcheck.cpp) is always compiled;
+# exactly one platform engine is selected by build option — native macOS NSSpellChecker
+# (Objective-C++), native Windows Spell Checking API, or Hunspell (default).
+target_sources(llui PRIVATE llspellcheck.cpp)
+if (USE_NSSPELLCHECKER)
+  target_sources(llui PRIVATE llspellcheckengine_mac.mm)
+  set_source_files_properties(llspellcheckengine_mac.mm PROPERTIES SKIP_PRECOMPILE_HEADERS TRUE)
+elseif (USE_WINSPELLCHECK)
+  target_sources(llui PRIVATE llspellcheckengine_win32.cpp)
+  set_source_files_properties(llspellcheckengine_win32.cpp PROPERTIES SKIP_PRECOMPILE_HEADERS TRUE)
+else ()
+  target_sources(llui PRIVATE llspellcheckengine_hunspell.cpp)
+endif ()
+
 SET(llurlentry_TEST_DEPENDENCIES
     llurlmatch.cpp
     llurlregistry.cpp
@@ -259,14 +273,28 @@ target_link_libraries(llui
         llxml
         llmath
         llcommon
-        ll::hunspell
     )
 
+if (USE_NSSPELLCHECKER)
+    target_link_libraries(llui PUBLIC ll::nsspellchecker)
+elseif (USE_WINSPELLCHECK)
+    target_link_libraries(llui PUBLIC ll::winspellcheck)
+else ()
+    target_link_libraries(llui PUBLIC ll::hunspell)
+endif ()
+
 target_precompile_headers(llui REUSE_FROM llprecompiled)
 
 # Add tests
 if(BUILD_TESTING)
-  set(test_libs llmessage llcorehttp llxml llrender llcommon ll::hunspell)
+  if (USE_NSSPELLCHECKER)
+    set(spellcheck_lib ll::nsspellchecker)
+  elseif (USE_WINSPELLCHECK)
+    set(spellcheck_lib ll::winspellcheck)
+  else ()
+    set(spellcheck_lib ll::hunspell)
+  endif ()
+  set(test_libs llmessage llcorehttp llxml llrender llcommon ${spellcheck_lib})
 
   SET(llui_TEST_SOURCE_FILES
       llurlmatch.cpp
@@ -275,7 +303,7 @@ if(BUILD_TESTING)
   LL_ADD_PROJECT_UNIT_TESTS(llui "${llui_TEST_SOURCE_FILES}")
 
   # INTEGRATION TESTS
-  set(test_libs llui llmessage llcorehttp llxml llrender llcommon ll::hunspell)
+  set(test_libs llui llmessage llcorehttp llxml llrender llcommon ${spellcheck_lib})
   set(test_project llui)
   LL_ADD_INTEGRATION_TEST(llurlentry llurlentry.cpp "${test_libs}" "${test_project}")
   LL_ADD_INTEGRATION_TEST(llemojidictionary llemojidictionary.cpp "${test_libs}" "${test_project}")