autoRegisterPlatformGuard function

String autoRegisterPlatformGuard({ required bool isNativeCpp, required bool isAndroidCpp, required bool iosIsCpp, required bool macosIsCpp, })

Builds the #if guard condition for the auto-register call inside a src/HybridXxx.cpp stub.

The guard ensures ${lib}_register_impl is only called on platforms where the C++ bridge is actually compiled — even if the stub file is accidentally included on a platform that uses a Swift or Kotlin bridge instead.

Returns an empty string when no guard is needed (all compiled platforms are C++).

Implementation

String autoRegisterPlatformGuard({
  required bool isNativeCpp,
  required bool isAndroidCpp,
  required bool iosIsCpp,
  required bool macosIsCpp,
}) {
  // All apple + android/linux → no guard needed
  if (isNativeCpp && macosIsCpp && iosIsCpp) return '';

  final conditions = <String>[];
  if (isNativeCpp) {
    // isNativeCpp is true when Android OR Linux (or both) use C++.
    // When only Linux uses C++ (isAndroidCpp is false), Android must be excluded:
    // __linux__ is defined on Android NDK too, so `!defined(__APPLE__)` would
    // incorrectly compile the auto-register on Android where register_impl is absent.
    if (isAndroidCpp) {
      conditions.add('!defined(__APPLE__)'); // android + linux + windows
    } else {
      conditions.add('(defined(__linux__) && !defined(__ANDROID__))'); // linux only
    }
  }
  if (macosIsCpp && iosIsCpp) {
    conditions.add('defined(__APPLE__)');
  } else if (macosIsCpp) {
    conditions.add('(defined(__APPLE__) && TARGET_OS_OSX)');
  } else if (iosIsCpp) {
    conditions.add('(defined(__APPLE__) && TARGET_OS_IOS)');
  }
  return conditions.join(' || ');
}