mirror of
https://github.com/urbit/shrub.git
synced 2024-12-17 07:14:52 +03:00
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* j/4/in_mer.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qdi_mer(u3_noun a,
|
|
u3_noun b)
|
|
{
|
|
if ( u3_nul == a ) {
|
|
return u3k(b);
|
|
}
|
|
else if ( u3_nul == b ) {
|
|
return u3k(a);
|
|
}
|
|
else {
|
|
u3_noun l_a, n_a, r_a, lr_a; // XX copy tree boilerplate to other pt4
|
|
u3_noun l_b, n_b, r_b, lr_b;
|
|
u3_noun c;
|
|
|
|
if ( (c3n == u3r_cell(a, &n_a, &lr_a)) ) {
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else if ( (c3n == u3r_cell(b, &n_b, &lr_b)) ) {
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else {
|
|
if ( c3y == u3qc_vor(n_b, n_a) ) {
|
|
c = a; a = b; b = c;
|
|
c = n_a; n_a = n_b; n_b = c;
|
|
c = lr_a; lr_a = lr_b; lr_b = c;
|
|
}
|
|
if ( c3n == u3r_cell(lr_a, &l_a, &r_a) ) {
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else if ( c3n == u3r_cell(lr_b, &l_b, &r_b) ) {
|
|
return u3m_bail(c3__exit);
|
|
}
|
|
else if ( c3y == u3r_sing(n_a, n_b) ) {
|
|
return u3nt(u3k(n_a),
|
|
u3qdi_mer(l_a, l_b),
|
|
u3qdi_mer(r_a, r_b));
|
|
}
|
|
else if ( c3y == u3qc_hor(n_b, n_a) ) {
|
|
return u3qdi_mer(u3nt(n_a,
|
|
u3qdi_mer(l_a,
|
|
u3nt(n_b,
|
|
l_b,
|
|
u3_nul)),
|
|
r_a),
|
|
r_b);
|
|
}
|
|
else {
|
|
return u3qdi_mer(u3nt(n_a,
|
|
l_a,
|
|
u3qdi_mer(r_a,
|
|
u3nt(n_b,
|
|
u3_nul,
|
|
r_b))),
|
|
l_b);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
u3_noun
|
|
u3wdi_mer(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 u3qdi_mer(a, b);
|
|
}
|
|
}
|