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Diffstat (limited to 'Modules/CMakeParseArguments.cmake')
| -rw-r--r-- | Modules/CMakeParseArguments.cmake | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/Modules/CMakeParseArguments.cmake b/Modules/CMakeParseArguments.cmake new file mode 100644 index 0000000000..4248176ad6 --- /dev/null +++ b/Modules/CMakeParseArguments.cmake @@ -0,0 +1,160 @@ +#.rst: +# CMakeParseArguments +# ------------------- +# +# +# +# CMAKE_PARSE_ARGUMENTS(<prefix> <options> <one_value_keywords> +# <multi_value_keywords> args...) +# +# CMAKE_PARSE_ARGUMENTS() is intended to be used in macros or functions +# for parsing the arguments given to that macro or function. It +# processes the arguments and defines a set of variables which hold the +# values of the respective options. +# +# The <options> argument contains all options for the respective macro, +# i.e. keywords which can be used when calling the macro without any +# value following, like e.g. the OPTIONAL keyword of the install() +# command. +# +# The <one_value_keywords> argument contains all keywords for this macro +# which are followed by one value, like e.g. DESTINATION keyword of the +# install() command. +# +# The <multi_value_keywords> argument contains all keywords for this +# macro which can be followed by more than one value, like e.g. the +# TARGETS or FILES keywords of the install() command. +# +# When done, CMAKE_PARSE_ARGUMENTS() will have defined for each of the +# keywords listed in <options>, <one_value_keywords> and +# <multi_value_keywords> a variable composed of the given <prefix> +# followed by "_" and the name of the respective keyword. These +# variables will then hold the respective value from the argument list. +# For the <options> keywords this will be TRUE or FALSE. +# +# All remaining arguments are collected in a variable +# <prefix>_UNPARSED_ARGUMENTS, this can be checked afterwards to see +# whether your macro was called with unrecognized parameters. +# +# As an example here a my_install() macro, which takes similar arguments +# as the real install() command: +# +# :: +# +# function(MY_INSTALL) +# set(options OPTIONAL FAST) +# set(oneValueArgs DESTINATION RENAME) +# set(multiValueArgs TARGETS CONFIGURATIONS) +# cmake_parse_arguments(MY_INSTALL "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN} ) +# ... +# +# +# +# Assume my_install() has been called like this: +# +# :: +# +# my_install(TARGETS foo bar DESTINATION bin OPTIONAL blub) +# +# +# +# After the cmake_parse_arguments() call the macro will have set the +# following variables: +# +# :: +# +# MY_INSTALL_OPTIONAL = TRUE +# MY_INSTALL_FAST = FALSE (this option was not used when calling my_install() +# MY_INSTALL_DESTINATION = "bin" +# MY_INSTALL_RENAME = "" (was not used) +# MY_INSTALL_TARGETS = "foo;bar" +# MY_INSTALL_CONFIGURATIONS = "" (was not used) +# MY_INSTALL_UNPARSED_ARGUMENTS = "blub" (no value expected after "OPTIONAL" +# +# +# +# You can then continue and process these variables. +# +# Keywords terminate lists of values, e.g. if directly after a +# one_value_keyword another recognized keyword follows, this is +# interpreted as the beginning of the new option. E.g. +# my_install(TARGETS foo DESTINATION OPTIONAL) would result in +# MY_INSTALL_DESTINATION set to "OPTIONAL", but MY_INSTALL_DESTINATION +# would be empty and MY_INSTALL_OPTIONAL would be set to TRUE therefor. + +#============================================================================= +# Copyright 2010 Alexander Neundorf <neundorf@kde.org> +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + + +if(__CMAKE_PARSE_ARGUMENTS_INCLUDED) + return() +endif() +set(__CMAKE_PARSE_ARGUMENTS_INCLUDED TRUE) + + +function(CMAKE_PARSE_ARGUMENTS prefix _optionNames _singleArgNames _multiArgNames) + # first set all result variables to empty/FALSE + foreach(arg_name ${_singleArgNames} ${_multiArgNames}) + set(${prefix}_${arg_name}) + endforeach() + + foreach(option ${_optionNames}) + set(${prefix}_${option} FALSE) + endforeach() + + set(${prefix}_UNPARSED_ARGUMENTS) + + set(insideValues FALSE) + set(currentArgName) + + # now iterate over all arguments and fill the result variables + foreach(currentArg ${ARGN}) + list(FIND _optionNames "${currentArg}" optionIndex) # ... then this marks the end of the arguments belonging to this keyword + list(FIND _singleArgNames "${currentArg}" singleArgIndex) # ... then this marks the end of the arguments belonging to this keyword + list(FIND _multiArgNames "${currentArg}" multiArgIndex) # ... then this marks the end of the arguments belonging to this keyword + + if(${optionIndex} EQUAL -1 AND ${singleArgIndex} EQUAL -1 AND ${multiArgIndex} EQUAL -1) + if(insideValues) + if("${insideValues}" STREQUAL "SINGLE") + set(${prefix}_${currentArgName} ${currentArg}) + set(insideValues FALSE) + elseif("${insideValues}" STREQUAL "MULTI") + list(APPEND ${prefix}_${currentArgName} ${currentArg}) + endif() + else() + list(APPEND ${prefix}_UNPARSED_ARGUMENTS ${currentArg}) + endif() + else() + if(NOT ${optionIndex} EQUAL -1) + set(${prefix}_${currentArg} TRUE) + set(insideValues FALSE) + elseif(NOT ${singleArgIndex} EQUAL -1) + set(currentArgName ${currentArg}) + set(${prefix}_${currentArgName}) + set(insideValues "SINGLE") + elseif(NOT ${multiArgIndex} EQUAL -1) + set(currentArgName ${currentArg}) + set(${prefix}_${currentArgName}) + set(insideValues "MULTI") + endif() + endif() + + endforeach() + + # propagate the result variables to the caller: + foreach(arg_name ${_singleArgNames} ${_multiArgNames} ${_optionNames}) + set(${prefix}_${arg_name} ${${prefix}_${arg_name}} PARENT_SCOPE) + endforeach() + set(${prefix}_UNPARSED_ARGUMENTS ${${prefix}_UNPARSED_ARGUMENTS} PARENT_SCOPE) + +endfunction() |