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https://github.com/ilyakooo0/urbit.git
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89 lines
1.8 KiB
C
89 lines
1.8 KiB
C
/* j/2/sort.c
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**
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*/
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#include "all.h"
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/* functions
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*/
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// like skid, except its callback is $-([* *] ?) and it takes the second
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// argument so that it calls its callback with [i.list, second]
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//
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// all args are RETAINED
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static u3_noun
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_split_in(u3j_site* sit_u,
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u3_noun a,
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u3_noun second)
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{
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if ( 0 == a ) {
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return u3nc(u3_nul, u3_nul);
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}
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else if ( c3n == u3du(a) ) {
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return u3m_bail(c3__exit);
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} else {
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u3_noun acc = _split_in(sit_u, u3t(a), second);
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u3_noun hoz = u3j_gate_slam(sit_u, u3nc(u3k(u3h(a)), u3k(second)));
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u3_noun nex;
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if ( c3y == hoz ) {
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nex = u3nc(u3nc(u3k(u3h(a)), u3k(u3h(acc))), u3k(u3t(acc)));
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}
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else {
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nex = u3nc(u3k(u3h(acc)), u3nc(u3k(u3h(a)), u3k(u3t(acc))));
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}
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u3z(hoz);
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u3z(acc);
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return nex;
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}
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}
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static u3_noun
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_sort_in(u3j_site* sit_u, u3_noun list)
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{
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if ( 0 == list ) {
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return u3_nul;
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}
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else if ( c3n == u3du(list) ) {
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return u3m_bail(c3__exit);
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} else {
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u3_noun hed, tal;
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u3x_cell(list, &hed, &tal);
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u3_noun split = _split_in(sit_u, tal, hed);
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u3_noun lhs = _sort_in(sit_u, u3h(split));
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u3_noun rhs = u3nc(u3k(hed), _sort_in(sit_u, u3t(split)));
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u3_noun ret = u3qb_weld(lhs, rhs);
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u3z(lhs);
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u3z(rhs);
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u3z(split);
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return ret;
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}
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}
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u3_noun
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u3qb_sort(u3_noun a,
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u3_noun b)
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{
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u3_noun pro;
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u3j_site sit_u;
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u3j_gate_prep(&sit_u, u3k(b));
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pro = _sort_in(&sit_u, a);
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u3j_gate_lose(&sit_u);
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return pro;
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}
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u3_noun
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u3wb_sort(u3_noun cor)
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{
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u3_noun a, b;
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if ( c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0) ) {
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return u3m_bail(c3__exit);
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} else {
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return u3qb_sort(a, b);
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}
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}
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