shrub/j/6/ut_rest.c

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/* j/6/ut_rest.c
**
** This file is in the public domain.
*/
#include "all.h"
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/* logic
*/
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static u3_noun
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_rest_in_list(
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u3_noun van,
u3_noun leg)
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{
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if ( u3_nul == leg ) {
return u3_nul;
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} else {
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u3_noun i_leg = u3h(leg);
u3_noun t_leg = u3t(leg);
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return u3nc
(u3_cqfu_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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static u3_noun
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_rest_in_stil(
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u3_noun van,
u3_noun gar)
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{
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u3_noun gun = u3_cqdi_gas(u3_nul, gar);
u3_noun nog = u3_cqdi_tap(gun, u3_nul);
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u3z(gun);
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return nog;
}
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static u3_noun
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_rest_in_fork(
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u3_noun nog,
u3_noun fub)
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{
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if ( u3_no == u3du(nog) ) {
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return fub;
} else {
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u3_noun buf = _rest_in_fork
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(
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u3t(nog),
u3_cqf_fork(u3h(nog), fub));
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u3z(fub);
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return buf;
}
}
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static u3_noun
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_rest_in(
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u3_noun van,
u3_noun leg)
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{
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u3_noun gar = _rest_in_list(van, leg);
u3_noun nog = _rest_in_stil(van, gar);
u3_noun fub = _rest_in_fork(nog, c3__void);
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u3z(gar);
u3z(nog);
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return fub;
}
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static u3_bean
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_rest_hit_fan(
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u3_noun fan,
u3_noun leg)
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{
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if ( u3_nul == leg ) {
return u3_no;
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} else {
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return u3_or(u3_cqdi_has(fan, u3h(leg)),
_rest_hit_fan(fan, u3t(leg)));
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}
}
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u3_noun
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_cqfu_rest(
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u3_noun van,
u3_noun sut,
u3_noun leg)
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{
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u3_noun fan = u3_cr_at(u3_cqfu_van_fan, van);
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if ( u3_yes == _rest_hit_fan(fan, leg) ) {
return u3_cm_error("rest-loop");
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}
else {
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u3_noun naf = u3_cqdi_gas(fan, leg);
u3_noun nav = u3_ci_molt(u3k(van), u3_cqfu_van_fan, naf, 0);
u3_noun mez = _rest_in(nav, leg);
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u3z(naf);
u3z(nav);
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return mez;
}
}
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/* boilerplate
*/
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u3_noun
u3_cwfu_rest(
u3_noun cor)
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{
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u3_noun sut, leg, van;
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if ( (u3_no == u3_cr_mean(cor, u3_cv_sam, &leg, u3_cv_con, &van, 0)) ||
(u3_none == (sut = u3_cr_at(u3_cv_sam, van))) )
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{
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return u3_cm_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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u3_noun
u3_cqfu_rest(u3_noun van,
u3_noun sut,
u3_noun leg)
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{
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c3_m fun_m = c3__rest;
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u3_noun pro = u3_cz_find_2(fun_m, sut, leg);
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if ( u3_none != pro ) {
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return pro;
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}
else {
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pro = _cqfu_rest(van, sut, leg);
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return u3_cz_save_2(fun_m, sut, leg, pro);
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}
}