shrub/jets/b/skim.c
Paul Driver 2b2dbf7a6d skim
2018-04-27 09:50:20 -07:00

53 lines
980 B
C

/* j/2/skim.c
**
*/
#include "all.h"
static u3_noun
_skim_in(u3j_site* sit_u, u3_noun a)
{
if ( 0 == a ) {
return a;
}
else if ( c3n == u3du(a) ) {
return u3m_bail(c3__exit);
} else {
u3_noun hoz = u3j_gate_slam(sit_u, u3k(u3h(a)));
u3_noun vyr = _skim_in(sit_u, u3t(a));
switch ( hoz ) {
case c3y: return u3nc(u3k(u3h(a)), vyr);
case c3n: return vyr;
default: u3z(hoz);
u3z(vyr);
return u3m_bail(c3__exit);
}
}
}
/* functions
*/
u3_noun
u3qb_skim(u3_noun a,
u3_noun b)
{
u3_noun pro;
u3j_site sit_u;
u3j_gate_prep(&sit_u, b);
pro = _skim_in(&sit_u, a);
u3j_gate_lose(&sit_u);
return pro;
}
u3_noun
u3wb_skim(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_skim(a, b);
}
}