What is common way to split string into list with

问题:

Imagine I have the following string :

set(SEXY_STRING "I love CMake")

then I want to obtain SEXY_LIST from SEXY_STRING so I can do

list(LENGTH SEXY_LIST len)

and len is equal 3.

I've found several macros on web, but I really want to know how to do it in "natural" way. This operation seems to be very basic and widely used.

回答1:

Replace your separator by a ;. I don't see any other way to do it.

cmake_minimum_required(VERSION 2.8)

set(SEXY_STRING "I love CMake")
string(REPLACE " " ";" SEXY_LIST ${SEXY_STRING})

message(STATUS "string = ${SEXY_STRING}")
# string = I love CMake

message(STATUS "list = ${SEXY_LIST}")
# list = I;love;CMake

list(LENGTH SEXY_LIST len)
message(STATUS "len = ${len}")
# len = 3

回答2:

You can use the SEPARATE_ARGUMENTS command: http://www.cmake.org/cmake/help/cmake2.6docs.html#command:separate_arguments

cmake_minimum_required(VERSION 2.6)

set(SEXY_STRING "I love CMake")

message(STATUS "string = ${SEXY_STRING}")
# string = I love CMake

set( SEXY_LIST ${SEXY_STRING} )
separate_arguments(SEXY_LIST)

message(STATUS "list = ${SEXY_LIST}")
# list = I;love;CMake

list(LENGTH SEXY_LIST len)
message(STATUS "len = ${len}")
# len = 3

回答3:

string(REGEX MATCHALL "[a-zA-Z]+\ |[a-zA-Z]+$" SEXY_LIST "${SEXY_STRING}")