sdk/cmake/CMakeParseArguments.cmake

   1 # CMAKE_PARSE_ARGUMENTS(<prefix> <options> <one_value_keywords> <multi_value_keywords> args...)
   2 #
   3 # CMAKE_PARSE_ARGUMENTS() is intended to be used in macros or functions for
   4 # parsing the arguments given to that macro or function.
   5 # It processes the arguments and defines a set of variables which hold the
   6 # values of the respective options.
   7 #
   8 # The <options> argument contains all options for the respective macro,
   9 # i.e. keywords which can be used when calling the macro without any value
  10 # following, like e.g. the OPTIONAL keyword of the install() command.
  11 #
  12 # The <one_value_keywords> argument contains all keywords for this macro
  13 # which are followed by one value, like e.g. DESTINATION keyword of the
  14 # install() command.
  15 #
  16 # The <multi_value_keywords> argument contains all keywords for this macro
  17 # which can be followed by more than one value, like e.g. the TARGETS or
  18 # FILES keywords of the install() command.
  19 #
  20 # When done, CMAKE_PARSE_ARGUMENTS() will have defined for each of the
  21 # keywords listed in <options>, <one_value_keywords> and
  22 # <multi_value_keywords> a variable composed of the given <prefix>
  23 # followed by "_" and the name of the respective keyword.
  24 # These variables will then hold the respective value from the argument list.
  25 # For the <options> keywords this will be TRUE or FALSE.
  26 #
  27 # All remaining arguments are collected in a variable
  28 # <prefix>_UNPARSED_ARGUMENTS, this can be checked afterwards to see whether
  29 # your macro was called with unrecognized parameters.
  30 #
  31 # As an example here a my_install() macro, which takes similar arguments as the
  32 # real install() command:
  33 #
  34 #   function(MY_INSTALL)
  35 #     set(options OPTIONAL FAST)
  36 #     set(oneValueArgs DESTINATION RENAME)
  37 #     set(multiValueArgs TARGETS CONFIGURATIONS)
  38 #     cmake_parse_arguments(MY_INSTALL "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN} )
  39 #     ...
  40 #
  41 # Assume my_install() has been called like this:
  42 #   my_install(TARGETS foo bar DESTINATION bin OPTIONAL blub)
  43 #
  44 # After the cmake_parse_arguments() call the macro will have set the following
  45 # variables:
  46 #   MY_INSTALL_OPTIONAL = TRUE
  47 #   MY_INSTALL_FAST = FALSE (this option was not used when calling my_install()
  48 #   MY_INSTALL_DESTINATION = "bin"
  49 #   MY_INSTALL_RENAME = "" (was not used)
  50 #   MY_INSTALL_TARGETS = "foo;bar"
  51 #   MY_INSTALL_CONFIGURATIONS = "" (was not used)
  52 #   MY_INSTALL_UNPARSED_ARGUMENTS = "blub" (no value expected after "OPTIONAL"
  53 #
  54 # You can the continue and process these variables.
  55 #
  56 # Keywords terminate lists of values, e.g. if directly after a one_value_keyword
  57 # another recognized keyword follows, this is interpreted as the beginning of
  58 # the new option.
  59 # E.g. my_install(TARGETS foo DESTINATION OPTIONAL) would result in
  60 # MY_INSTALL_DESTINATION set to "OPTIONAL", but MY_INSTALL_DESTINATION would
  61 # be empty and MY_INSTALL_OPTIONAL would be set to TRUE therefor.
  62
  63 #=============================================================================
  64 # Copyright 2010 Alexander Neundorf <neundorf@kde.org>
  65 #
  66 # Redistribution and use in source and binary forms, with or without
  67 # modification, are permitted provided that the following conditions
  68 # are met:
  69 #
  70 # * Redistributions of source code must retain the above copyright
  71 #   notice, this list of conditions and the following disclaimer.
  72 #
  73 # * Redistributions in binary form must reproduce the above copyright
  74 #   notice, this list of conditions and the following disclaimer in the
  75 #   documentation and/or other materials provided with the distribution.
  76 #
  77 # * Neither the names of Kitware, Inc., the Insight Software Consortium,
  78 #   nor the names of their contributors may be used to endorse or promote
  79 #   products derived from this software without specific prior written
  80 #   permission.
  81 #
  82 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  83 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  84 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  85 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  86 # HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  87 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  88 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  89 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  90 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  91 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  92 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  93 #=============================================================================
  94
  95
  96 if(__CMAKE_PARSE_ARGUMENTS_INCLUDED)
  97   return()
  98 endif()
  99 set(__CMAKE_PARSE_ARGUMENTS_INCLUDED TRUE)
 100
 101
 102 function(CMAKE_PARSE_ARGUMENTS prefix _optionNames _singleArgNames _multiArgNames)
 103   # first set all result variables to empty/FALSE
 104   foreach(arg_name ${_singleArgNames} ${_multiArgNames})
 105     set(${prefix}_${arg_name})
 106   endforeach(arg_name)
 107
 108   foreach(option ${_optionNames})
 109     set(${prefix}_${option} FALSE)
 110   endforeach(option)
 111
 112   set(${prefix}_UNPARSED_ARGUMENTS)
 113
 114   set(insideValues FALSE)
 115   set(currentArgName)
 116
 117   # now iterate over all arguments and fill the result variables
 118   foreach(currentArg ${ARGN})
 119     list(FIND _optionNames "${currentArg}" optionIndex)  # ... then this marks the end of the arguments belonging to this keyword
 120     list(FIND _singleArgNames "${currentArg}" singleArgIndex)  # ... then this marks the end of the arguments belonging to this keyword
 121     list(FIND _multiArgNames "${currentArg}" multiArgIndex)  # ... then this marks the end of the arguments belonging to this keyword
 122
 123     if(${optionIndex} EQUAL -1  AND  ${singleArgIndex} EQUAL -1  AND  ${multiArgIndex} EQUAL -1)
 124       if(insideValues)
 125         if("${insideValues}" STREQUAL "SINGLE")
 126           set(${prefix}_${currentArgName} ${currentArg})
 127           set(insideValues FALSE)
 128         elseif("${insideValues}" STREQUAL "MULTI")
 129           list(APPEND ${prefix}_${currentArgName} ${currentArg})
 130         endif()
 131       else(insideValues)
 132         list(APPEND ${prefix}_UNPARSED_ARGUMENTS ${currentArg})
 133       endif(insideValues)
 134     else()
 135       if(NOT ${optionIndex} EQUAL -1)
 136         set(${prefix}_${currentArg} TRUE)
 137         set(insideValues FALSE)
 138       elseif(NOT ${singleArgIndex} EQUAL -1)
 139         set(currentArgName ${currentArg})
 140         set(${prefix}_${currentArgName})
 141         set(insideValues "SINGLE")
 142       elseif(NOT ${multiArgIndex} EQUAL -1)
 143         set(currentArgName ${currentArg})
 144         set(${prefix}_${currentArgName})
 145         set(insideValues "MULTI")
 146       endif()
 147     endif()
 148
 149   endforeach(currentArg)
 150
 151   # propagate the result variables to the caller:
 152   foreach(arg_name ${_singleArgNames} ${_multiArgNames} ${_optionNames})
 153     set(${prefix}_${arg_name}  ${${prefix}_${arg_name}} PARENT_SCOPE)
 154   endforeach(arg_name)
 155   set(${prefix}_UNPARSED_ARGUMENTS ${${prefix}_UNPARSED_ARGUMENTS} PARENT_SCOPE)
 156
 157 endfunction(CMAKE_PARSE_ARGUMENTS _options _singleArgs _multiArgs)