urbit/j/6/flay.c
2014-09-05 13:13:24 -07:00

57 lines
1.0 KiB
C

/* j/6/flay.c
**
** This file is in the public domain.
*/
#include "all.h"
/* functions
*/
static u3_noun
_flay_roll(
u3_noun quz)
{
if ( u3_no == u3du(quz) ) {
return c3__void;
} else {
u3_noun voo = _flay_roll(u3t(quz));
u3_noun oon = u3_cqf_fork(u3h(u3h(quz)), voo);
u3z(voo);
return oon;
}
}
u3_noun
u3_cqf_flay(
u3_noun pok)
{
u3_noun p_pok = u3h(pok);
u3_noun q_pok = u3t(pok);
u3_noun typ;
switch ( u3h(q_pok) ) {
default: return u3_cm_bail(c3__fail);
case u3_yes: typ = u3k(u3t(q_pok));
break;
case u3_no: typ = _flay_roll(u3t(u3t(q_pok)));
break;
}
return u3nc(u3k(p_pok), typ);
}
u3_noun
u3_cwf_flay(
u3_noun cor)
{
u3_noun pok;
if ( (u3_no == u3_cr_mean(cor, u3_cv_sam, &pok, 0)) ||
(u3_no == u3du(pok)) ) {
return u3_cm_bail(c3__fail);
} else {
return u3_cqf_flay(pok);
}
}