63 lines
1.6 KiB
Text
63 lines
1.6 KiB
Text
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__HEADER__(Iterate over powerset of clist)
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\ExplSyntaxOn
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%%% Iterate over powerset of claist
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\clist_new:N \l_powerset_copied_clist
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\seq_new:N \l_powerset_saved_seq
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\cs_generate_variant:Nn \clist_remove_all:Nn { N V }
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% Pseudocode of this macro
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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_new:Npn \__powerset_clist_foreach_aux:Nn #1 #2
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{
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\clist_if_empty:NTF \l_powerset_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 \l_powerset_copied_clist \l_tmpa_tl
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\seq_push:NV \l_powerset_saved_seq \l_tmpa_tl
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\clist_pop:NN \l_powerset_copied_clist { \l_tmpa_tl }
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\__powerset_clist_foreach_aux:Nn #1 {#2}
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\seq_get:NN \l_powerset_saved_seq \l_tmpa_tl
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\clist_put_left:NV #1 \l_tmpa_tl
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\__powerset_clist_foreach_aux:Nn #1 {#2}
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\seq_get:NN \l_powerset_saved_seq \l_tmpa_tl
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\clist_remove_all:NV #1 \l_tmpa_tl
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\clist_push:NV \l_powerset_copied_clist \l_tmpa_tl
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\seq_pop:NN \l_powerset_saved_seq \l_tmpa_tl
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}
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}
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% Usage:
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% \clist_use_powerset:Nn {clist variable name}{code for each subset}
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% This will execute #2 for each subset of the listname given as #1
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% In #2, the name given as #1 can be used for the current subset
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% After execution, the value of #1 is restored
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\cs_new:Npn \powerset_clist_foreach:Nn #1 #2
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{
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\clist_set_eq:NN \l_powerset_copied_clist #1
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\clist_clear:N #1
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\clist_remove_duplicates:N \l_powerset_copied_clist
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\__powerset_clist_foreach_aux:Nn #1 {#2}
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\clist_set_eq:NN #1 \l_powerset_copied_clist
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}
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