CMakeLists.txt

cmake_minimum_required(VERSION 3.2)

option(JSON_VALIDATOR_INSTALL "Install target" ON)
option(JSON_VALIDATOR_HUNTER "Enable Hunter package manager support" OFF)

if(JSON_VALIDATOR_HUNTER)
    include("cmake/HunterGate.cmake")
    HunterGate(
        URL "https://github.com/cpp-pm/hunter/archive/v0.23.262.tar.gz"
        SHA1 "eb51e633e08cdbe2153caf255e9c23968fecb29d"
    )
endif()

# the project
project(nlohmann_json_schema_validator
        LANGUAGES CXX)

set(PROJECT_VERSION 2.1.1)

if(JSON_VALIDATOR_HUNTER)
    hunter_add_package(nlohmann_json)
endif()

# the library
add_library(nlohmann_json_schema_validator
    src/json-schema-draft7.json.cpp
    src/json-uri.cpp
    src/json-validator.cpp
    src/json-patch.cpp
    src/string-format-check.cpp)

target_include_directories(nlohmann_json_schema_validator
    PUBLIC
        $<INSTALL_INTERFACE:include>
        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>)

target_compile_features(nlohmann_json_schema_validator
    PUBLIC
        cxx_range_for) # for C++11 - flags

set_target_properties(nlohmann_json_schema_validator
                      PROPERTIES
                          VERSION ${PROJECT_VERSION}
                          SOVERSION 1)

# disable tests and examples if project is not super project
if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
    # I am top-level project.
    set(JSON_VALIDATOR_IS_TOP_LEVEL ON)
endif()

option(JSON_VALIDATOR_BUILD_TESTS    "Build tests"    ${JSON_VALIDATOR_IS_TOP_LEVEL})
option(JSON_VALIDATOR_BUILD_EXAMPLES "Build examples" ${JSON_VALIDATOR_IS_TOP_LEVEL})

if(NOT TARGET nlohmann_json::nlohmann_json)
    find_package(nlohmann_json REQUIRED)
endif()

target_link_libraries(
    nlohmann_json_schema_validator
    PUBLIC nlohmann_json::nlohmann_json)

if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR
   "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
    target_compile_options(nlohmann_json_schema_validator
        PRIVATE
            -Wall -Wextra -Wshadow)
endif()

if(BUILD_SHARED_LIBS)
    target_compile_definitions(nlohmann_json_schema_validator
        PRIVATE
            -DJSON_SCHEMA_VALIDATOR_EXPORTS)
endif()

# regex with boost if gcc < 4.9 - default is std::regex
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
    if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.9.0")
        find_package(Boost COMPONENTS regex)
        if(NOT Boost_FOUND)
            message(STATUS "GCC less then 4.9 and boost-regex NOT found - no regex used")
            target_compile_definitions(nlohmann_json_schema_validator PRIVATE -DJSON_SCHEMA_NO_REGEX)
        else()
            message(STATUS "GCC less then 4.9 and boost-regex FOUND - using boost::regex")
            target_compile_definitions(nlohmann_json_schema_validator PRIVATE -DJSON_SCHEMA_BOOST_REGEX)
            target_include_directories(nlohmann_json_schema_validator PRIVATE ${Boost_INCLUDE_DIRS})
            target_link_libraries(nlohmann_json_schema_validator PRIVATE ${Boost_LIBRARIES})
        endif()
    endif()
endif()

if(JSON_VALIDATOR_INSTALL)
    install(TARGETS nlohmann_json_schema_validator
            EXPORT ${PROJECT_NAME}Targets
            LIBRARY DESTINATION lib
            ARCHIVE DESTINATION lib
            RUNTIME DESTINATION bin)

    install(FILES src/nlohmann/json-schema.hpp
            DESTINATION include/nlohmann)
endif()

if (JSON_VALIDATOR_BUILD_EXAMPLES)
    # simple nlohmann_json_schema_validator-executable
    add_executable(json-schema-validate app/json-schema-validate.cpp)
    target_link_libraries(json-schema-validate nlohmann_json_schema_validator)

    add_executable(readme-json-schema app/readme.cpp)
    target_link_libraries(readme-json-schema nlohmann_json_schema_validator)

    add_executable(format-json-schema app/format.cpp)
    target_link_libraries(format-json-schema nlohmann_json_schema_validator)

    install(TARGETS json-schema-validate readme-json-schema
            DESTINATION bin)
endif()

if (JSON_VALIDATOR_BUILD_TESTS)
    # test-zone
    enable_testing()
    add_subdirectory(test)
endif()

# Set Up the Project Targets and Config Files for CMake

if(JSON_VALIDATOR_INSTALL)
    # Set the install path to the cmake config files (Relative, so install works correctly under Hunter as well)
    set(INSTALL_CMAKE_DIR "lib/cmake/${PROJECT_NAME}")
    set(INSTALL_CMAKEDIR_ROOT share/cmake)

    # Install Targets
    install(EXPORT ${PROJECT_NAME}Targets
            FILE ${PROJECT_NAME}Targets.cmake
            DESTINATION "${INSTALL_CMAKE_DIR}")

    include(CMakePackageConfigHelpers)
    write_basic_package_version_file(
        ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
        VERSION ${PROJECT_VERSION}
        COMPATIBILITY SameMajorVersion
        )

    configure_package_config_file(
        ${PROJECT_SOURCE_DIR}/${PROJECT_NAME}Config.cmake.in
        ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
        INSTALL_DESTINATION ${INSTALL_CMAKEDIR_ROOT}/${PROJECT_NAME}
        )

    install(
        FILES
            ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
            ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake
        DESTINATION
            ${INSTALL_CMAKE_DIR}
        )
endif()