1#- Find python interpreter
2# This module finds if Python interpreter is installed and determines where the
3# executables are. This code sets the following variables:
4#
5#  PYTHONINTERP_FOUND         - Was the Python executable found
6#  PYTHON_EXECUTABLE          - path to the Python interpreter
7#
8#  PYTHON_VERSION_STRING      - Python version found e.g. 2.5.2
9#  PYTHON_VERSION_MAJOR       - Python major version found e.g. 2
10#  PYTHON_VERSION_MINOR       - Python minor version found e.g. 5
11#  PYTHON_VERSION_PATCH       - Python patch version found e.g. 2
12#
13# The Python_ADDITIONAL_VERSIONS variable can be used to specify a list of
14# version numbers that should be taken into account when searching for Python.
15# You need to set this variable before calling find_package(PythonInterp).
16
17#=============================================================================
18# Copyright 2005-2010 Kitware, Inc.
19# Copyright 2011 Bjoern Ricks <bjoern.ricks@gmail.com>
20# Copyright 2012 Rolf Eike Beer <eike@sf-mail.de>
21#
22# Distributed under the OSI-approved BSD License (the "License");
23# see accompanying file Copyright.txt for details.
24#
25# This software is distributed WITHOUT ANY WARRANTY; without even the
26# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
27# See the License for more information.
28#=============================================================================
29# (To distribute this file outside of CMake, substitute the full
30#  License text for the above reference.)
31
32unset(_Python_NAMES)
33
34set(_PYTHON1_VERSIONS 1.6 1.5)
35set(_PYTHON2_VERSIONS 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0)
36set(_PYTHON3_VERSIONS 3.5 3.4 3.3 3.2 3.1 3.0)
37
38if(PythonInterp_FIND_VERSION)
39    if(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
40        string(REGEX REPLACE "^([0-9]+\\.[0-9]+).*" "\\1" _PYTHON_FIND_MAJ_MIN "${PythonInterp_FIND_VERSION}")
41        string(REGEX REPLACE "^([0-9]+).*" "\\1" _PYTHON_FIND_MAJ "${_PYTHON_FIND_MAJ_MIN}")
42        list(APPEND _Python_NAMES python${_PYTHON_FIND_MAJ_MIN} python${_PYTHON_FIND_MAJ})
43        unset(_PYTHON_FIND_OTHER_VERSIONS)
44        if(NOT PythonInterp_FIND_VERSION_EXACT)
45            foreach(_PYTHON_V ${_PYTHON${_PYTHON_FIND_MAJ}_VERSIONS})
46                if(NOT _PYTHON_V VERSION_LESS _PYTHON_FIND_MAJ_MIN)
47                    list(APPEND _PYTHON_FIND_OTHER_VERSIONS ${_PYTHON_V})
48                endif()
49             endforeach()
50        endif(NOT PythonInterp_FIND_VERSION_EXACT)
51        unset(_PYTHON_FIND_MAJ_MIN)
52        unset(_PYTHON_FIND_MAJ)
53    else(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
54        list(APPEND _Python_NAMES python${PythonInterp_FIND_VERSION})
55        set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON${PythonInterp_FIND_VERSION}_VERSIONS})
56    endif(PythonInterp_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\.[0-9]+.*)?$")
57else(PythonInterp_FIND_VERSION)
58    set(_PYTHON_FIND_OTHER_VERSIONS ${_PYTHON3_VERSIONS} ${_PYTHON2_VERSIONS} ${_PYTHON1_VERSIONS})
59endif(PythonInterp_FIND_VERSION)
60
61list(APPEND _Python_NAMES python)
62
63# Search for the current active python version first
64find_program(PYTHON_EXECUTABLE NAMES ${_Python_NAMES})
65
66# Set up the versions we know about, in the order we will search. Always add
67# the user supplied additional versions to the front.
68set(_Python_VERSIONS
69  ${Python_ADDITIONAL_VERSIONS}
70  ${_PYTHON_FIND_OTHER_VERSIONS}
71  )
72
73unset(_PYTHON_FIND_OTHER_VERSIONS)
74unset(_PYTHON1_VERSIONS)
75unset(_PYTHON2_VERSIONS)
76unset(_PYTHON3_VERSIONS)
77
78# Search for newest python version if python executable isn't found
79if(NOT PYTHON_EXECUTABLE)
80    foreach(_CURRENT_VERSION ${_Python_VERSIONS})
81      set(_Python_NAMES python${_CURRENT_VERSION})
82      if(WIN32)
83        list(APPEND _Python_NAMES python)
84      endif()
85      find_program(PYTHON_EXECUTABLE
86        NAMES ${_Python_NAMES}
87        PATHS [HKEY_LOCAL_MACHINE\\SOFTWARE\\Python\\PythonCore\\${_CURRENT_VERSION}\\InstallPath]
88        )
89    endforeach()
90endif()
91
92# determine python version string
93if(PYTHON_EXECUTABLE)
94    execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c
95                            "import sys; sys.stdout.write(';'.join([str(x) for x in sys.version_info[:3]]))"
96                    OUTPUT_VARIABLE _VERSION
97                    RESULT_VARIABLE _PYTHON_VERSION_RESULT
98                    ERROR_QUIET)
99    if(NOT _PYTHON_VERSION_RESULT)
100        string(REPLACE ";" "." PYTHON_VERSION_STRING "${_VERSION}")
101        list(GET _VERSION 0 PYTHON_VERSION_MAJOR)
102        list(GET _VERSION 1 PYTHON_VERSION_MINOR)
103        list(GET _VERSION 2 PYTHON_VERSION_PATCH)
104        if(PYTHON_VERSION_PATCH EQUAL 0)
105            # it's called "Python 2.7", not "2.7.0"
106            string(REGEX REPLACE "\\.0$" "" PYTHON_VERSION_STRING "${PYTHON_VERSION_STRING}")
107        endif()
108    else()
109        # sys.version predates sys.version_info, so use that
110        execute_process(COMMAND "${PYTHON_EXECUTABLE}" -c "import sys; sys.stdout.write(sys.version)"
111                        OUTPUT_VARIABLE _VERSION
112                        RESULT_VARIABLE _PYTHON_VERSION_RESULT
113                        ERROR_QUIET)
114        if(NOT _PYTHON_VERSION_RESULT)
115            string(REGEX REPLACE " .*" "" PYTHON_VERSION_STRING "${_VERSION}")
116            string(REGEX REPLACE "^([0-9]+)\\.[0-9]+.*" "\\1" PYTHON_VERSION_MAJOR "${PYTHON_VERSION_STRING}")
117            string(REGEX REPLACE "^[0-9]+\\.([0-9])+.*" "\\1" PYTHON_VERSION_MINOR "${PYTHON_VERSION_STRING}")
118            if(PYTHON_VERSION_STRING MATCHES "^[0-9]+\\.[0-9]+\\.[0-9]+.*")
119                string(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" PYTHON_VERSION_PATCH "${PYTHON_VERSION_STRING}")
120            else()
121                set(PYTHON_VERSION_PATCH "0")
122            endif()
123        else()
124            # sys.version was first documented for Python 1.5, so assume
125            # this is older.
126            set(PYTHON_VERSION_STRING "1.4")
127            set(PYTHON_VERSION_MAJOR "1")
128            set(PYTHON_VERSION_MAJOR "4")
129            set(PYTHON_VERSION_MAJOR "0")
130        endif()
131    endif()
132    unset(_PYTHON_VERSION_RESULT)
133    unset(_VERSION)
134endif(PYTHON_EXECUTABLE)
135
136# handle the QUIETLY and REQUIRED arguments and set PYTHONINTERP_FOUND to TRUE if
137# all listed variables are TRUE
138include(FindPackageHandleStandardArgs)
139FIND_PACKAGE_HANDLE_STANDARD_ARGS(PythonInterp REQUIRED_VARS PYTHON_EXECUTABLE VERSION_VAR PYTHON_VERSION_STRING)
140
141mark_as_advanced(PYTHON_EXECUTABLE)
142