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+# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+FindLua
+-------
+
+
+
+Locate Lua library.
+
+This module defines::
+
+::
+
+ LUA_FOUND - if false, do not try to link to Lua
+ LUA_LIBRARIES - both lua and lualib
+ LUA_INCLUDE_DIR - where to find lua.h
+ LUA_VERSION_STRING - the version of Lua found
+ LUA_VERSION_MAJOR - the major version of Lua
+ LUA_VERSION_MINOR - the minor version of Lua
+ LUA_VERSION_PATCH - the patch version of Lua
+
+
+
+Note that the expected include convention is
+
+::
+
+ #include "lua.h"
+
+and not
+
+::
+
+ #include <lua/lua.h>
+
+This is because, the lua location is not standardized and may exist in
+locations other than lua/
+#]=======================================================================]
+
+cmake_policy(PUSH) # Policies apply to functions at definition-time
+cmake_policy(SET CMP0012 NEW) # For while(TRUE)
+
+unset(_lua_include_subdirs)
+unset(_lua_library_names)
+unset(_lua_append_versions)
+
+# this is a function only to have all the variables inside go away automatically
+function(_lua_get_versions)
+ set(LUA_VERSIONS5 5.3 5.2 5.1 5.0)
+
+ if (Lua_FIND_VERSION_EXACT)
+ if (Lua_FIND_VERSION_COUNT GREATER 1)
+ set(_lua_append_versions ${Lua_FIND_VERSION_MAJOR}.${Lua_FIND_VERSION_MINOR})
+ endif ()
+ elseif (Lua_FIND_VERSION)
+ # once there is a different major version supported this should become a loop
+ if (NOT Lua_FIND_VERSION_MAJOR GREATER 5)
+ if (Lua_FIND_VERSION_COUNT EQUAL 1)
+ set(_lua_append_versions ${LUA_VERSIONS5})
+ else ()
+ foreach (subver IN LISTS LUA_VERSIONS5)
+ if (NOT subver VERSION_LESS ${Lua_FIND_VERSION})
+ list(APPEND _lua_append_versions ${subver})
+ endif ()
+ endforeach ()
+ # New version -> Search for it (heuristic only! Defines in include might have changed)
+ if (NOT _lua_append_versions)
+ set(_lua_append_versions ${Lua_FIND_VERSION_MAJOR}.${Lua_FIND_VERSION_MINOR})
+ endif()
+ endif ()
+ endif ()
+ else ()
+ # once there is a different major version supported this should become a loop
+ set(_lua_append_versions ${LUA_VERSIONS5})
+ endif ()
+
+ if (LUA_Debug)
+ message(STATUS "Considering following Lua versions: ${_lua_append_versions}")
+ endif()
+
+ set(_lua_append_versions "${_lua_append_versions}" PARENT_SCOPE)
+endfunction()
+
+function(_lua_set_version_vars)
+ set(_lua_include_subdirs_raw "lua")
+
+ foreach (ver IN LISTS _lua_append_versions)
+ string(REGEX MATCH "^([0-9]+)\\.([0-9]+)$" _ver "${ver}")
+ list(APPEND _lua_include_subdirs_raw
+ lua${CMAKE_MATCH_1}${CMAKE_MATCH_2}
+ lua${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
+ lua-${CMAKE_MATCH_1}.${CMAKE_MATCH_2}
+ )
+ endforeach ()
+
+ # Prepend "include/" to each path directly after the path
+ set(_lua_include_subdirs "include")
+ foreach (dir IN LISTS _lua_include_subdirs_raw)
+ list(APPEND _lua_include_subdirs "${dir}" "include/${dir}")
+ endforeach ()
+
+ set(_lua_include_subdirs "${_lua_include_subdirs}" PARENT_SCOPE)
+endfunction(_lua_set_version_vars)
+
+function(_lua_get_header_version)
+ unset(LUA_VERSION_STRING PARENT_SCOPE)
+ set(_hdr_file "${LUA_INCLUDE_DIR}/lua.h")
+
+ if (NOT EXISTS "${_hdr_file}")
+ return()
+ endif ()
+
+ # At least 5.[012] have different ways to express the version
+ # so all of them need to be tested. Lua 5.2 defines LUA_VERSION
+ # and LUA_RELEASE as joined by the C preprocessor, so avoid those.
+ file(STRINGS "${_hdr_file}" lua_version_strings
+ REGEX "^#define[ \t]+LUA_(RELEASE[ \t]+\"Lua [0-9]|VERSION([ \t]+\"Lua [0-9]|_[MR])).*")
+
+ string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MAJOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MAJOR ";${lua_version_strings};")
+ if (LUA_VERSION_MAJOR MATCHES "^[0-9]+$")
+ string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_MINOR[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_MINOR ";${lua_version_strings};")
+ string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION_RELEASE[ \t]+\"([0-9])\"[ \t]*;.*" "\\1" LUA_VERSION_PATCH ";${lua_version_strings};")
+ set(LUA_VERSION_STRING "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}.${LUA_VERSION_PATCH}")
+ else ()
+ string(REGEX REPLACE ".*;#define[ \t]+LUA_RELEASE[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
+ if (NOT LUA_VERSION_STRING MATCHES "^[0-9.]+$")
+ string(REGEX REPLACE ".*;#define[ \t]+LUA_VERSION[ \t]+\"Lua ([0-9.]+)\"[ \t]*;.*" "\\1" LUA_VERSION_STRING ";${lua_version_strings};")
+ endif ()
+ string(REGEX REPLACE "^([0-9]+)\\.[0-9.]*$" "\\1" LUA_VERSION_MAJOR "${LUA_VERSION_STRING}")
+ string(REGEX REPLACE "^[0-9]+\\.([0-9]+)[0-9.]*$" "\\1" LUA_VERSION_MINOR "${LUA_VERSION_STRING}")
+ string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]).*" "\\1" LUA_VERSION_PATCH "${LUA_VERSION_STRING}")
+ endif ()
+ foreach (ver IN LISTS _lua_append_versions)
+ if (ver STREQUAL "${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}")
+ set(LUA_VERSION_MAJOR ${LUA_VERSION_MAJOR} PARENT_SCOPE)
+ set(LUA_VERSION_MINOR ${LUA_VERSION_MINOR} PARENT_SCOPE)
+ set(LUA_VERSION_PATCH ${LUA_VERSION_PATCH} PARENT_SCOPE)
+ set(LUA_VERSION_STRING ${LUA_VERSION_STRING} PARENT_SCOPE)
+ return()
+ endif ()
+ endforeach ()
+endfunction(_lua_get_header_version)
+
+function(_lua_find_header)
+ _lua_set_version_vars()
+
+ # Initialize as local variable
+ set(CMAKE_IGNORE_PATH ${CMAKE_IGNORE_PATH})
+ while (TRUE)
+ # Find the next header to test. Check each possible subdir in order
+ # This prefers e.g. higher versions as they are earlier in the list
+ # It is also consistent with previous versions of FindLua
+ foreach (subdir IN LISTS _lua_include_subdirs)
+ find_path(LUA_INCLUDE_DIR lua.h
+ HINTS ENV LUA_DIR
+ PATH_SUFFIXES ${subdir}
+ )
+ if (LUA_INCLUDE_DIR)
+ break()
+ endif()
+ endforeach()
+ # Did not found header -> Fail
+ if (NOT LUA_INCLUDE_DIR)
+ return()
+ endif()
+ _lua_get_header_version()
+ # Found accepted version -> Ok
+ if (LUA_VERSION_STRING)
+ if (LUA_Debug)
+ message(STATUS "Found suitable version ${LUA_VERSION_STRING} in ${LUA_INCLUDE_DIR}/lua.h")
+ endif()
+ return()
+ endif()
+ # Found wrong version -> Ignore this path and retry
+ if (LUA_Debug)
+ message(STATUS "Ignoring unsuitable version in ${LUA_INCLUDE_DIR}")
+ endif()
+ list(APPEND CMAKE_IGNORE_PATH "${LUA_INCLUDE_DIR}")
+ unset(LUA_INCLUDE_DIR CACHE)
+ unset(LUA_INCLUDE_DIR)
+ unset(LUA_INCLUDE_DIR PARENT_SCOPE)
+ endwhile ()
+endfunction()
+
+_lua_get_versions()
+_lua_find_header()
+_lua_get_header_version()
+unset(_lua_append_versions)
+
+if (LUA_VERSION_STRING)
+ set(_lua_library_names
+ lua${LUA_VERSION_MAJOR}${LUA_VERSION_MINOR}
+ lua${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
+ lua-${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
+ lua.${LUA_VERSION_MAJOR}.${LUA_VERSION_MINOR}
+ )
+endif ()
+
+find_library(LUA_LIBRARY
+ NAMES ${_lua_library_names} lua
+ NAMES_PER_DIR
+ HINTS
+ ENV LUA_DIR
+ PATH_SUFFIXES lib
+)
+unset(_lua_library_names)
+
+if (LUA_LIBRARY)
+ # include the math library for Unix
+ if (UNIX AND NOT APPLE AND NOT BEOS)
+ find_library(LUA_MATH_LIBRARY m)
+ mark_as_advanced(LUA_MATH_LIBRARY)
+ set(LUA_LIBRARIES "${LUA_LIBRARY};${LUA_MATH_LIBRARY}")
+
+ # include dl library for statically-linked Lua library
+ get_filename_component(LUA_LIB_EXT ${LUA_LIBRARY} EXT)
+ if(LUA_LIB_EXT STREQUAL CMAKE_STATIC_LIBRARY_SUFFIX)
+ list(APPEND LUA_LIBRARIES ${CMAKE_DL_LIBS})
+ endif()
+
+ # For Windows and Mac, don't need to explicitly include the math library
+ else ()
+ set(LUA_LIBRARIES "${LUA_LIBRARY}")
+ endif ()
+endif ()
+
+include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
+# handle the QUIETLY and REQUIRED arguments and set LUA_FOUND to TRUE if
+# all listed variables are TRUE
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Lua
+ REQUIRED_VARS LUA_LIBRARIES LUA_INCLUDE_DIR
+ VERSION_VAR LUA_VERSION_STRING)
+
+mark_as_advanced(LUA_INCLUDE_DIR LUA_LIBRARY)
+
+cmake_policy(POP)
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