# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#.rst:
# FindEXPAT
# ---------
#
# Find the native Expat headers and library.
#
# Imported Targets
# ^^^^^^^^^^^^^^^^
#
# This module defines the following :prop_tgt:`IMPORTED` targets:
#
# ``EXPAT::EXPAT``
#   The Expat ``expat`` library, if found.
#
# Result Variables
# ^^^^^^^^^^^^^^^^
#
# This module will set the following variables in your project:
#
# ``EXPAT_INCLUDE_DIRS``
#   where to find expat.h, etc.
# ``EXPAT_LIBRARIES``
#   the libraries to link against to use Expat.
# ``EXPAT_FOUND``
#   true if the Expat headers and libraries were found.
#

find_package(PkgConfig QUIET)

pkg_check_modules(PC_EXPAT QUIET expat)

# Look for the header file.
find_path(EXPAT_INCLUDE_DIR NAMES expat.h HINTS ${PC_EXPAT_INCLUDE_DIRS})

# Look for the library.
find_library(EXPAT_LIBRARY NAMES expat libexpat HINTS ${PC_EXPAT_LIBRARY_DIRS})

if (EXPAT_INCLUDE_DIR AND EXISTS "${EXPAT_INCLUDE_DIR}/expat.h")
    file(STRINGS "${EXPAT_INCLUDE_DIR}/expat.h" expat_version_str
         REGEX "^#[\t ]*define[\t ]+XML_(MAJOR|MINOR|MICRO)_VERSION[\t ]+[0-9]+$")

    unset(EXPAT_VERSION_STRING)
    foreach(VPART MAJOR MINOR MICRO)
        foreach(VLINE ${expat_version_str})
            if(VLINE MATCHES "^#[\t ]*define[\t ]+XML_${VPART}_VERSION[\t ]+([0-9]+)$")
                set(EXPAT_VERSION_PART "${CMAKE_MATCH_1}")
                if(EXPAT_VERSION_STRING)
                    string(APPEND EXPAT_VERSION_STRING ".${EXPAT_VERSION_PART}")
                else()
                    set(EXPAT_VERSION_STRING "${EXPAT_VERSION_PART}")
                endif()
            endif()
        endforeach()
    endforeach()
endif ()

include(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(EXPAT
                                  REQUIRED_VARS EXPAT_LIBRARY EXPAT_INCLUDE_DIR
                                  VERSION_VAR EXPAT_VERSION_STRING)

# Copy the results to the output variables and target.
if(EXPAT_FOUND)
  set(EXPAT_LIBRARIES ${EXPAT_LIBRARY})
  set(EXPAT_INCLUDE_DIRS ${EXPAT_INCLUDE_DIR})

  if(NOT TARGET EXPAT::EXPAT)
    add_library(EXPAT::EXPAT UNKNOWN IMPORTED)
    set_target_properties(EXPAT::EXPAT PROPERTIES
      IMPORTED_LINK_INTERFACE_LANGUAGES "C"
      IMPORTED_LOCATION "${EXPAT_LIBRARY}"
      INTERFACE_INCLUDE_DIRECTORIES "${EXPAT_INCLUDE_DIRS}")
  endif()
endif()

mark_as_advanced(EXPAT_INCLUDE_DIR EXPAT_LIBRARY)