cpp/cmake_modules/FindRapidJSONAlt.cmake

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if(RapidJSONAlt_FOUND)
  return()
endif()

set(find_package_args)
if(RapidJSONAlt_FIND_VERSION)
  list(APPEND find_package_args ${RapidJSONAlt_FIND_VERSION})
endif()
if(RapidJSONAlt_FIND_QUIETLY)
  list(APPEND find_package_args QUIET)
endif()
find_package(RapidJSON ${find_package_args})
if(RapidJSON_FOUND)
  set(RapidJSONAlt_FOUND TRUE)
  if(NOT TARGET RapidJSON)
    add_library(RapidJSON INTERFACE IMPORTED)
    if(RapidJSON_INCLUDE_DIRS)
      target_include_directories(RapidJSON INTERFACE "${RapidJSON_INCLUDE_DIRS}")
    else()
      target_include_directories(RapidJSON INTERFACE "${RAPIDJSON_INCLUDE_DIRS}")
    endif()
  endif()
  return()
endif()

if(RapidJSON_ROOT)
  find_path(RAPIDJSON_INCLUDE_DIR
            NAMES rapidjson/rapidjson.h
            PATHS ${RapidJSON_ROOT}
            NO_DEFAULT_PATH
            PATH_SUFFIXES "include")
else()
  find_path(RAPIDJSON_INCLUDE_DIR
            NAMES rapidjson/rapidjson.h
            PATH_SUFFIXES "include")
endif()

if(RAPIDJSON_INCLUDE_DIR)
  file(READ "${RAPIDJSON_INCLUDE_DIR}/rapidjson/rapidjson.h" RAPIDJSON_H_CONTENT)
  string(REGEX MATCH "#define RAPIDJSON_MAJOR_VERSION ([0-9]+)"
               RAPIDJSON_MAJOR_VERSION_DEFINITION "${RAPIDJSON_H_CONTENT}")
  string(REGEX REPLACE "^.+ ([0-9]+)$" "\\1" RAPIDJSON_MAJOR_VERSION
                       "${RAPIDJSON_MAJOR_VERSION_DEFINITION}")
  string(REGEX MATCH "#define RAPIDJSON_MINOR_VERSION ([0-9]+)"
               RAPIDJSON_MINOR_VERSION_DEFINITION "${RAPIDJSON_H_CONTENT}")
  string(REGEX REPLACE "^.+ ([0-9]+)$" "\\1" RAPIDJSON_MINOR_VERSION
                       "${RAPIDJSON_MINOR_VERSION_DEFINITION}")
  string(REGEX MATCH "#define RAPIDJSON_PATCH_VERSION ([0-9]+)"
               RAPIDJSON_PATCH_VERSION_DEFINITION "${RAPIDJSON_H_CONTENT}")
  string(REGEX REPLACE "^.+ ([0-9]+)$" "\\1" RAPIDJSON_PATCH_VERSION
                       "${RAPIDJSON_PATCH_VERSION_DEFINITION}")
  if("${RAPIDJSON_MAJOR_VERSION}" STREQUAL ""
     OR "${RAPIDJSON_MINOR_VERSION}" STREQUAL ""
     OR "${RAPIDJSON_PATCH_VERSION}" STREQUAL "")
    set(RAPIDJSON_VERSION "0.0.0")
  else()
    set(RAPIDJSON_VERSION
        "${RAPIDJSON_MAJOR_VERSION}.${RAPIDJSON_MINOR_VERSION}.${RAPIDJSON_PATCH_VERSION}"
    )
  endif()
endif()

find_package_handle_standard_args(
  RapidJSONAlt
  REQUIRED_VARS RAPIDJSON_INCLUDE_DIR
  VERSION_VAR RAPIDJSON_VERSION)

if(RapidJSONAlt_FOUND)
  if(WIN32 AND "${RAPIDJSON_INCLUDE_DIR}" MATCHES "^/")
    # MSYS2
    execute_process(COMMAND "cygpath" "--windows" "${RAPIDJSON_INCLUDE_DIR}"
                    OUTPUT_VARIABLE RAPIDJSON_INCLUDE_DIR
                    OUTPUT_STRIP_TRAILING_WHITESPACE)
  endif()
  add_library(RapidJSON INTERFACE IMPORTED)
  target_include_directories(RapidJSON INTERFACE "${RAPIDJSON_INCLUDE_DIR}")
endif()