mirror of
https://github.com/ilyakooo0/urbit.git
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115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
/* j/6/ut_rest.c
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**
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*/
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#include "all.h"
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/* logic
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*/
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static u3_noun
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_rest_in_list(u3_noun van,
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u3_noun leg)
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{
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if ( u3_nul == leg ) {
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return u3_nul;
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} else {
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u3_noun i_leg = u3h(leg);
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u3_noun t_leg = u3t(leg);
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return u3nc(u3qfu_play(van, u3h(i_leg), u3t(i_leg)),
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_rest_in_list(van, t_leg));
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}
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}
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static u3_noun
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_rest_in_stil(u3_noun van,
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u3_noun gar)
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{
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u3_noun gun = u3qdi_gas(u3_nul, gar);
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u3_noun yed = u3qdi_tap(gun);
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u3z(gun);
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return yed;
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}
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static u3_noun
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_rest_in(u3_noun van,
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u3_noun leg)
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{
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u3_noun gar = _rest_in_list(van, leg);
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u3_noun yed = _rest_in_stil(van, gar);
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u3_noun fub = u3qf_fork(yed);
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u3z(gar);
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u3z(yed);
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return fub;
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}
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static u3_noun
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_rest_hit_fan(u3_noun fan,
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u3_noun leg)
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{
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if ( u3_nul == leg ) {
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return c3n;
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} else {
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return c3o(u3qdi_has(fan, u3h(leg)),
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_rest_hit_fan(fan, u3t(leg)));
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}
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}
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static u3_noun
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_cqfu_rest(u3_noun van,
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u3_noun sut,
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u3_noun leg)
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{
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u3_noun fan = u3r_at(u3qfu_van_fan, van);
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if ( c3y == _rest_hit_fan(fan, leg) ) {
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return u3m_error("rest-loop");
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}
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else {
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u3_noun naf = u3qdi_gas(fan, leg);
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u3_noun nav = u3i_molt(u3k(van), u3qfu_van_fan, u3k(naf), 0);
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u3_noun mez = _rest_in(nav, leg);
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u3z(naf);
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u3z(nav);
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return mez;
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}
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}
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/* boilerplate
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*/
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u3_noun
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u3wfu_rest(u3_noun cor)
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{
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u3_noun sut, leg, van;
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if ( (c3n == u3r_mean(cor, u3x_sam, &leg, u3x_con, &van, 0)) ||
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(u3_none == (sut = u3r_at(u3x_sam, van))) )
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{
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return u3m_bail(c3__fail);
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} else {
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return _cqfu_rest(van, sut, leg);
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}
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}
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u3_noun
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u3qfu_rest(u3_noun van,
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u3_noun sut,
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u3_noun leg)
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{
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c3_m fun_m = 144 + c3__rest + ((!!u3r_at(u3qfu_van_vet, van)) << 8);
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u3_noun pro = u3z_find_2(fun_m, sut, leg);
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if ( u3_none != pro ) {
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return pro;
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}
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else {
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pro = _cqfu_rest(van, sut, leg);
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return u3z_save_2(fun_m, sut, leg, pro);
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}
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}
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