[CMake] Iterating empty elements in a list
I've seen that list(LENGTH) will ignore empty elements in a list. Example: 1;2;;4;5 Length will be 4 here instead of 5. I was trying to come up with a way to modify the list as a string prior to iterating it to give empty elements some dummy value, so that the above example would appear as: 1;2;empty;4;5 However, this isn't going to work with string( REGEX REPLACE ) as the modifications are not included in the continuation of the regex search (I think positive lookbehind is needed here?). Basically this case cannot be converted: ;;; to: empty;empty;empty Anyone know how I can iterate empty elements in a list? -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Iterating empty elements in a list
Just to be clear, I can't use foreach(): foreach( var IN LISTS list ) I am doing a yielded approach to looping by using list( GET ) and list( LENGTH ) in combination. So I would need the list() functions to acknowledge empty elements. On Tue, Aug 6, 2013 at 3:04 PM, Robert Dailey rcdailey.li...@gmail.com wrote: I've seen that list(LENGTH) will ignore empty elements in a list. Example: 1;2;;4;5 Length will be 4 here instead of 5. I was trying to come up with a way to modify the list as a string prior to iterating it to give empty elements some dummy value, so that the above example would appear as: 1;2;empty;4;5 However, this isn't going to work with string( REGEX REPLACE ) as the modifications are not included in the continuation of the regex search (I think positive lookbehind is needed here?). Basically this case cannot be converted: ;;; to: empty;empty;empty Anyone know how I can iterate empty elements in a list? -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://www.cmake.org/mailman/listinfo/cmake
Re: [CMake] Iterating empty elements in a list
Sorry for the spam, after posting a solution dawned on me. Here is
what I did for anyone else that might need a solution (or care to
propose a better one):
function( replace_empty_elements out_list in_list )
foreach( item IN LISTS in_list )
if( item STREQUAL )
set( item_val EMPTY )
else()
set( item_val ${item} )
endif()
list( APPEND formatted_list ${item_val} )
endforeach()
set( ${out_list} ${formatted_list} PARENT_SCOPE )
endfunction()
Use it like so:
set( inlist ;;test; )
replace_empty_elements( outlist ${inlist} )
message( outlist: ${outlist} )
Output:
outlist: EMPTY;EMPTY;test;EMPTY
On Tue, Aug 6, 2013 at 3:10 PM, Robert Dailey rcdailey.li...@gmail.com wrote:
Just to be clear, I can't use foreach():
foreach( var IN LISTS list )
I am doing a yielded approach to looping by using list( GET ) and
list( LENGTH ) in combination. So I would need the list() functions to
acknowledge empty elements.
On Tue, Aug 6, 2013 at 3:04 PM, Robert Dailey rcdailey.li...@gmail.com
wrote:
I've seen that list(LENGTH) will ignore empty elements in a list. Example:
1;2;;4;5
Length will be 4 here instead of 5. I was trying to come up with a way
to modify the list as a string prior to iterating it to give empty
elements some dummy value, so that the above example would appear as:
1;2;empty;4;5
However, this isn't going to work with string( REGEX REPLACE ) as the
modifications are not included in the continuation of the regex search
(I think positive lookbehind is needed here?). Basically this case
cannot be converted:
;;;
to:
empty;empty;empty
Anyone know how I can iterate empty elements in a list?
--
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Kitware offers various services to support the CMake community. For more
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