File: FindMuParser.cmake

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#
# Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
#
# This file is part of Orfeo Toolbox
#
#     https://www.orfeo-toolbox.org/
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# - Find MuParser
# Find the native MuParser includes and library
#
#   MUPARSER_FOUND        - True if MuParser found.
#   MUPARSER_INCLUDE_DIRS - where to find muParser.h, etc.
#   MUPARSER_LIBRARIES    - List of libraries when using MuParser.
#   MUPARSER_VERSION        - version string
#   MUPARSER_VERSION_MAJOR  - version major number
#   MUPARSER_VERSION_MINOR  - version minor number
#   MUPARSER_VERSION_PATCH  - version patch number
#   MUPARSER_VERSION_NUMBER - version number ((major*100)+minor)*100+patch
#

if( MUPARSER_INCLUDE_DIR )
    # Already in cache, be silent
    set( MuParser_FIND_QUIETLY TRUE )
endif()

find_path( MUPARSER_INCLUDE_DIR muParser.h
           PATH_SUFFIXES muParser )

if(EXISTS "${MUPARSER_INCLUDE_DIR}/muParserDef.h")
  file(READ "${MUPARSER_INCLUDE_DIR}/muParserDef.h" _muParserDef_h_CONTENTS)
  
  # Try to find the version for muparser < 2.3
  string(REGEX REPLACE ".*# *define MUP_VERSION *_T\\(\"([0-9.]+)\"\\).*" "\\1" 
    MUPARSER_VERSION_OLD_STYLE "${_muParserDef_h_CONTENTS}")

  # Try to find the version for muparser >= 2.3
  string(REGEX REPLACE ".*static *const *string_type *ParserVersion *= *string_type\\(_T\\(\"([0-9.]+)\"\\)\\);.*" 
      "\\1" MUPARSER_VERSION "${MUPARSER_VERSION_OLD_STYLE}")
  
  if(MUPARSER_VERSION MATCHES "^[0-9]+\$")
    set(MUPARSER_VERSION "${MUPARSER_VERSION}.0.0")
  endif()
  if(MUPARSER_VERSION MATCHES "^[0-9]+\\.[0-9]+\$")
    set(MUPARSER_VERSION "${MUPARSER_VERSION}.0")
  endif()
  string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\1" MUPARSER_VERSION_MAJOR "${MUPARSER_VERSION}")
  string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\2" MUPARSER_VERSION_MINOR "${MUPARSER_VERSION}")
  string(REGEX REPLACE "([0-9]+)\\.([0-9]+)\\.([0-9]+)" "\\3" MUPARSER_VERSION_PATCH "${MUPARSER_VERSION}")
  math(EXPR MUPARSER_VERSION_NUMBER
    "((${MUPARSER_VERSION_MAJOR})*100+${MUPARSER_VERSION_MINOR})*100+${MUPARSER_VERSION_PATCH}")
else()
  if(NOT MuParser_FIND_QUIETLY)
  message(WARNING "muParserDef.h not found !")
  endif()
endif()

find_library( MUPARSER_LIBRARY
              NAMES muparser
              PATH_SUFFIXES muparser )

# handle the QUIETLY and REQUIRED arguments and set MUPARSER_FOUND to TRUE if
# all listed variables are TRUE
include( FindPackageHandleStandardArgs )
find_package_handle_standard_args( MuParser DEFAULT_MSG MUPARSER_LIBRARY MUPARSER_INCLUDE_DIR )

mark_as_advanced( MUPARSER_INCLUDE_DIR MUPARSER_LIBRARY )

if(MUPARSER_FOUND)
  set(MUPARSER_INCLUDE_DIRS ${MUPARSER_INCLUDE_DIR})
  set(MUPARSER_LIBRARIES    ${MUPARSER_LIBRARY})
else()
  set(MUPARSER_INCLUDE_DIRS)
  set(MUPARSER_LIBRARIES)
endif()