mirror of
https://github.com/urbit/shrub.git
synced 2024-12-23 02:41:35 +03:00
46 lines
801 B
C
46 lines
801 B
C
/* j/2/roll.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
|
|
static u3_noun
|
|
_roll_in(u3j_site* sit_u, u3_noun a, u3_noun b)
|
|
{
|
|
if ( 0 == a ) {
|
|
return b;
|
|
}
|
|
else if ( c3n == u3du(a) ) {
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else {
|
|
b = u3j_gate_slam(sit_u, u3nc(u3k(u3h(a)), b));
|
|
return _roll_in(sit_u, u3t(a), b);
|
|
}
|
|
}
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qb_roll(u3_noun a,
|
|
u3_noun b)
|
|
{
|
|
u3_noun pro;
|
|
u3j_site sit_u;
|
|
u3j_gate_prep(&sit_u, b);
|
|
pro = _roll_in(&sit_u, a, u3k(u3r_at(u3x_sam_3, b)));
|
|
u3j_gate_lose(&sit_u);
|
|
return pro;
|
|
}
|
|
u3_noun
|
|
u3wb_roll(u3_noun cor)
|
|
{
|
|
u3_noun a, b;
|
|
|
|
if ( c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0) ) {
|
|
return u3m_bail(c3__exit);
|
|
} else {
|
|
return u3qb_roll(a, b);
|
|
}
|
|
}
|
|
|