83 lines
1.5 KiB
TeX
83 lines
1.5 KiB
TeX
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\documentclass{article}
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\ExplSyntaxOn
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\clist_new:N \copied_clist
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\seq_new:N \saved_seq
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%remove left -> push on stack
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% call recursive
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% add left to 'extra'
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% call recursive
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% remove left from 'extra'
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% add from stack to left
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\cs_generate_variant:Nn \clist_remove_all:Nn { N V }
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\cs_new:Npn \clist_use_powerset_aux:Nn #1 #2
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{
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\clist_if_empty:NTF \copied_clist
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{
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#2
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}
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{
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\clist_get:NN \copied_clist \l_tmpa_tl % gets first element of copied list into local
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\seq_push:NV \saved_seq \l_tmpa_tl % pushes local value onto stack
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\clist_pop:NN \copied_clist { \l_tmpa_tl } % removes from copied list
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\clist_use_powerset_aux:Nn #1 {#2}
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\seq_get:NN \saved_seq \l_tmpa_tl
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\clist_put_left:NV #1 \l_tmpa_tl
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\clist_use_powerset_aux:Nn #1 {#2}
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\seq_get:NN \saved_seq \l_tmpa_tl
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\clist_remove_all:NV #1 \l_tmpa_tl
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\clist_push:NV \copied_clist \l_tmpa_tl
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\seq_pop:NN \saved_seq \l_tmpa_tl
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}
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}
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\cs_new:Npn \clist_use_powerset:Nn #1 #2
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{
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\clist_set_eq:NN \copied_clist #1
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\clist_clear:N #1
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\clist_remove_duplicates:N \copied_clist
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\clist_use_powerset_aux:Nn #1 {#2}
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\clist_set_eq:NN #1 \copied_clist
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}
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\clist_new:N \test_clist
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\tl_set:Nn \test_clist {1,2,3,4,5,6,7,8,9}
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\def\foo {
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\clist_use_powerset:Nn \test_clist
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{
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% reached~end:~
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% \clist_use:Nn \test_clist {,} \newline
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\stepcounter{testval}
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}
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\test_clist
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}
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\ExplSyntaxOff
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\begin{document}
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\newcounter{testval}
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\noindent \foo
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\thetestval
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\end{document}
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