mirror of
https://github.com/urbit/shrub.git
synced 2024-12-11 11:02:25 +03:00
53 lines
953 B
C
53 lines
953 B
C
/* j/2/skip.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
|
|
static u3_noun
|
|
_skip_in(u3j_site* sit_u, u3_noun a)
|
|
{
|
|
if ( 0 == a ) {
|
|
return a;
|
|
}
|
|
else if ( c3n == u3du(a) ) {
|
|
return u3_none;
|
|
} else {
|
|
u3_noun hoz = u3j_gate_slam(sit_u, u3k(u3h(a)));
|
|
u3_noun vyr = _skip_in(sit_u, u3t(a));
|
|
|
|
switch ( hoz ) {
|
|
case c3y: return vyr;
|
|
case c3n: return u3nc(u3k(u3h(a)), vyr);
|
|
default: u3z(hoz);
|
|
u3z(vyr);
|
|
return u3_none;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qb_skip(u3_noun a,
|
|
u3_noun b)
|
|
{
|
|
u3j_site sit_u;
|
|
u3_noun pro;
|
|
u3j_gate_prep(&sit_u, u3k(b));
|
|
pro = _skip_in(&sit_u, a);
|
|
u3j_gate_lose(&sit_u);
|
|
return pro;
|
|
}
|
|
u3_noun
|
|
u3wb_skip(u3_noun cor)
|
|
{
|
|
u3_noun a, b;
|
|
|
|
if ( c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0) ) {
|
|
return u3_none;
|
|
} else {
|
|
return u3qb_skip(a, b);
|
|
}
|
|
}
|
|
|