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

#.rst:
# FindLibXml2
# -----------
#
# Find the XML processing library (libxml2).
#
# Result variables
# ^^^^^^^^^^^^^^^^
#
# This module will set the following variables in your project:
#
# ``LIBXML2_FOUND``
#   true if libxml2 headers and libraries were found
# ``LIBXML2_INCLUDE_DIR``
#   the directory containing LibXml2 headers
# ``LIBXML2_INCLUDE_DIRS``
#   list of the include directories needed to use LibXml2
# ``LIBXML2_LIBRARIES``
#   LibXml2 libraries to be linked
# ``LIBXML2_DEFINITIONS``
#   the compiler switches required for using LibXml2
# ``LIBXML2_XMLLINT_EXECUTABLE``
#   path to the XML checking tool xmllint coming with LibXml2
# ``LIBXML2_VERSION_STRING``
#   the version of LibXml2 found (since CMake 2.8.8)
#
# Cache variables
# ^^^^^^^^^^^^^^^
#
# The following cache variables may also be set:
#
# ``LIBXML2_INCLUDE_DIR``
#   the directory containing LibXml2 headers
# ``LIBXML2_LIBRARY``
#   path to the LibXml2 library

# use pkg-config to get the directories and then use these values
# in the find_path() and find_library() calls
find_package(PkgConfig QUIET)
PKG_CHECK_MODULES(PC_LIBXML QUIET libxml-2.0)
set(LIBXML2_DEFINITIONS ${PC_LIBXML_CFLAGS_OTHER})

find_path(LIBXML2_INCLUDE_DIR NAMES libxml/xpath.h
   HINTS
   ${PC_LIBXML_INCLUDEDIR}
   ${PC_LIBXML_INCLUDE_DIRS}
   PATH_SUFFIXES libxml2
   )

# CMake 3.9 and below used 'LIBXML2_LIBRARIES' as the name of
# the cache entry storing the find_library result.  Use the
# value if it was set by the project or user.
if(DEFINED LIBXML2_LIBRARIES AND NOT DEFINED LIBXML2_LIBRARY)
  set(LIBXML2_LIBRARY ${LIBXML2_LIBRARIES})
endif()

find_library(LIBXML2_LIBRARY NAMES xml2 libxml2
   HINTS
   ${PC_LIBXML_LIBDIR}
   ${PC_LIBXML_LIBRARY_DIRS}
   )

find_program(LIBXML2_XMLLINT_EXECUTABLE xmllint)
# for backwards compat. with KDE 4.0.x:
set(XMLLINT_EXECUTABLE "${LIBXML2_XMLLINT_EXECUTABLE}")

if(PC_LIBXML_VERSION)
    set(LIBXML2_VERSION_STRING ${PC_LIBXML_VERSION})
elseif(LIBXML2_INCLUDE_DIR AND EXISTS "${LIBXML2_INCLUDE_DIR}/libxml/xmlversion.h")
    file(STRINGS "${LIBXML2_INCLUDE_DIR}/libxml/xmlversion.h" libxml2_version_str
         REGEX "^#define[\t ]+LIBXML_DOTTED_VERSION[\t ]+\".*\"")

    string(REGEX REPLACE "^#define[\t ]+LIBXML_DOTTED_VERSION[\t ]+\"([^\"]*)\".*" "\\1"
           LIBXML2_VERSION_STRING "${libxml2_version_str}")
    unset(libxml2_version_str)
endif()

set(LIBXML2_INCLUDE_DIRS ${LIBXML2_INCLUDE_DIR} ${PC_LIBXML_INCLUDE_DIRS})
set(LIBXML2_LIBRARIES ${LIBXML2_LIBRARY})

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibXml2
                                  REQUIRED_VARS LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR
                                  VERSION_VAR LIBXML2_VERSION_STRING)

mark_as_advanced(LIBXML2_INCLUDE_DIR LIBXML2_LIBRARY LIBXML2_XMLLINT_EXECUTABLE)