mirror of
https://github.com/urbit/shrub.git
synced 2024-12-01 22:55:03 +03:00
78 lines
1.3 KiB
C
78 lines
1.3 KiB
C
/* j/4/by_get.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qdb_get(u3_noun a,
|
|
u3_noun b)
|
|
{
|
|
if ( u3_nul == a ) {
|
|
return u3_nul;
|
|
}
|
|
else {
|
|
u3_noun l_a, n_a, r_a;
|
|
u3_noun pn_a, qn_a;
|
|
|
|
if ( (c3n == u3r_trel(a, &n_a, &l_a, &r_a)) ||
|
|
(c3n == u3r_cell(n_a, &pn_a, &qn_a) ) )
|
|
{
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else {
|
|
if ( (c3y == u3r_sing(b, pn_a)) ) {
|
|
return u3nc(u3_nul, u3k(qn_a));
|
|
}
|
|
else {
|
|
if ( c3y == u3qc_gor(b, pn_a) ) {
|
|
return u3qdb_get(l_a, b);
|
|
}
|
|
else return u3qdb_get(r_a, b);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
u3_noun
|
|
u3wdb_get(u3_noun cor)
|
|
{
|
|
u3_noun a, b;
|
|
|
|
if ( c3n == u3r_mean(cor, u3x_sam, &b, u3x_con_sam, &a, 0) ) {
|
|
return u3m_bail(c3__exit);
|
|
} else {
|
|
return u3qdb_get(a, b);
|
|
}
|
|
}
|
|
u3_weak
|
|
u3kdb_get(u3_noun a,
|
|
u3_noun b)
|
|
{
|
|
u3_noun c = u3qdb_get(a, b);
|
|
|
|
u3z(a); u3z(b);
|
|
if ( c3n == u3r_du(c) ) {
|
|
u3z(c);
|
|
return u3_none;
|
|
} else {
|
|
u3_noun pro = u3k(u3t(c));
|
|
|
|
u3z(c);
|
|
return pro;
|
|
}
|
|
}
|
|
u3_noun
|
|
u3kdb_got(u3_noun a,
|
|
u3_noun b)
|
|
{
|
|
u3_weak c = u3kdb_get(a, b);
|
|
|
|
if ( u3_none == c ) {
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else return c;
|
|
}
|
|
|