FindANTLR.cmake

find_package(Java QUIET COMPONENTS Runtime)

if(NOT ANTLR_EXECUTABLE)
  find_program(ANTLR_EXECUTABLE
               NAMES antlr.jar antlr4.jar antlr-4.jar antlr-4.13.0-complete.jar)
endif()

if(ANTLR_EXECUTABLE AND Java_JAVA_EXECUTABLE)
  execute_process(
      COMMAND ${Java_JAVA_EXECUTABLE} -jar ${ANTLR_EXECUTABLE}
      OUTPUT_VARIABLE ANTLR_COMMAND_OUTPUT
      ERROR_VARIABLE ANTLR_COMMAND_ERROR
      RESULT_VARIABLE ANTLR_COMMAND_RESULT
      OUTPUT_STRIP_TRAILING_WHITESPACE)

  if(ANTLR_COMMAND_RESULT EQUAL 0)
    string(REGEX MATCH "Version [0-9]+(\\.[0-9]+)*" ANTLR_VERSION ${ANTLR_COMMAND_OUTPUT})
    string(REPLACE "Version " "" ANTLR_VERSION ${ANTLR_VERSION})
  else()
    message(
        SEND_ERROR
        "Command '${Java_JAVA_EXECUTABLE} -jar ${ANTLR_EXECUTABLE}' "
        "failed with the output '${ANTLR_COMMAND_ERROR}'")
  endif()

  macro(ANTLR_TARGET Name InputFile)
    set(ANTLR_OPTIONS LEXER PARSER LISTENER VISITOR)
    set(ANTLR_ONE_VALUE_ARGS PACKAGE OUTPUT_DIRECTORY DEPENDS_ANTLR)
    set(ANTLR_MULTI_VALUE_ARGS COMPILE_FLAGS DEPENDS)
    cmake_parse_arguments(ANTLR_TARGET
                          "${ANTLR_OPTIONS}"
                          "${ANTLR_ONE_VALUE_ARGS}"
                          "${ANTLR_MULTI_VALUE_ARGS}"
                          ${ARGN})

    set(ANTLR_${Name}_INPUT ${InputFile})

    get_filename_component(ANTLR_INPUT ${InputFile} NAME_WE)

    if(ANTLR_TARGET_OUTPUT_DIRECTORY)
      set(ANTLR_${Name}_OUTPUT_DIR ${ANTLR_TARGET_OUTPUT_DIRECTORY})
    else()
      set(ANTLR_${Name}_OUTPUT_DIR
          ${CMAKE_CURRENT_BINARY_DIR}/antlr4cpp_generated_src/${ANTLR_INPUT})
    endif()

    unset(ANTLR_${Name}_CXX_OUTPUTS)

    if((ANTLR_TARGET_LEXER AND NOT ANTLR_TARGET_PARSER) OR
       (ANTLR_TARGET_PARSER AND NOT ANTLR_TARGET_LEXER))
      list(APPEND ANTLR_${Name}_CXX_OUTPUTS
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}.h
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}.cpp)
      set(ANTLR_${Name}_OUTPUTS
          ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}.interp
          ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}.tokens)
    else()
      list(APPEND ANTLR_${Name}_CXX_OUTPUTS
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}Lexer.h
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}Lexer.cpp
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}Parser.h
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}Parser.cpp)
      list(APPEND ANTLR_${Name}_OUTPUTS
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}Lexer.interp
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}Lexer.tokens)
    endif()

    if(ANTLR_TARGET_LISTENER)
      list(APPEND ANTLR_${Name}_CXX_OUTPUTS
           ${ANTLR_${Name}_OUTPUT_DIR}/${ANTLR_INPUT}BaseListener.h